Updated on 2026/03/28

写真a

 
FUJII MANABU
 
Organization
School of Environment and Society Associate Professor
Title
Associate Professor
Homepage
https://sites.google.com/site/manabufujiiattit/home
External link

News & Topics

Degree

  • 博士（工学）(論文題目:Kinetics of Superoxide-Mediated Reduction of Organically Complexed Iron and Ferric Iron Oxyhydroxide in Coastal Waters-沿岸域でのスーパーオキシドによる有機鉄及び水酸化鉄の還元メカニズム) ( 東北大学 )

Research Interests

  • Environmental Engineering

  • 生物地球化学

  • 水処理

  • 持続可能な開発

  • 環境工学

  • 環境科学

Research Areas

  • Social Infrastructure (Civil Engineering, Architecture, Disaster Prevention) / Environmental systems for civil engineering

Education

  • Tohoku University   Graduate School of Engineering   Department of Civil and Environmental Engineering

    - 2007.3

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    Country： Japan

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Research History

  • Tokyo Institute of Technology   Associate Professor

    2020.6

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  • Tokyo Institute of Technology   School of Environment and Society

    2015.10

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  • Tokyo Institute of Technology   Graduate School of Science and Engineering, Department of Civil Engineering   Assistant Professor

    2010.10 - 2015.9

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  • ニューサウスウェールズ大学   客員研究員

    2010.10 - 2015.9

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  • ニューサウスウェールズ大学   土木環境工学科   平成22年度採用海外特別研究員

    2010.4

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  • Japan Society for the Promotion of Science

    2010.4 - 2010.9

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  • 土木環境工学科

    2007.10 - 2009.3

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  • Tohoku University

    2007.4 - 2010.3

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  • 大学院工学研究科 土木工学専攻

    2007.3 - 2010.3

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  • Tohoku University   Graduate School of Engineering, Department of Civil and Environmental Engineering

    2005.4 - 2007.3

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Professional Memberships

Papers

  • Iron-catalyzed transformation of kraft lignin into multifunctional carbon materials for removal of emerging contaminants: Synergistic adsorption and catalytic degradation Reviewed International coauthorship International journal

    Huan Zhao, Yuqiao Bai, Manabu Fujii, Toshihiro Isobe, Xiaoying Zhu, Baoliang Chen, Bei Zhang

    Journal of Water Process Engineering   86   109879 - 109879   2026.4

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    Language：English   Publishing type：Research paper (scientific journal)   Publisher：Elsevier BV  

    DOI： 10.1016/j.jwpe.2026.109879

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  • Preparation of Carbon-Coated Ceramic Membranes for Membrane Distillation and Their Application to PFAS Removal Reviewed International coauthorship International journal

    Rin Tanaka, Yasuhide Mochizuki, Naoki Arimitsu, Ko-ichi Yamamoto, Bei Zhang, Jibao Liu, Akira Nakajima, Yuri Oki, Manabu Fujii, Toshihiro Isobe

    ACS ES&T Water   6 ( 3 )   1786 - 1794   2026.2

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    Publishing type：Research paper (scientific journal)   Publisher：American Chemical Society (ACS)  

    DOI： 10.1021/acsestwater.5c01318

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  • Pore structure modulation and surface functionalization boosted adsorption of PFAS on porous carbon: Experimental and theoretical investigations

    Bei Zhang, Daiki Moriyama, Thilini Maheshika Herath, Huan Zhao, Yuqiao Bai, Yueming Dang, Wei Liu, Hiromichi Kato, Koichi Yamamoto, Yasuhide Mochizuki, Naoki Arimitsu, Akira Nakajima, Xiaoying Zhu, Baoliang Chen, Manabu Fujii, Toshihiro Isobe

    Journal of Hazardous Materials   499   140063 - 140063   2025.11

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    Publishing type：Research paper (scientific journal)   Publisher：Elsevier BV  

    DOI： 10.1016/j.jhazmat.2025.140063

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  • Accurate detection and high throughput profiling of unknown PFAS transformation products for elucidating degradation pathways. Reviewed International coauthorship International journal

    Bei Zhang, Jibao Liu, Shanshan Qing, Thilini Maheshika Herath, Huan Zhao, Supaporn Klabklaydee, Qing-Long Fu, Eunsang Kwon, Nozomi Takeuchi, Douyan Wang, Takao Namihira, Toshihiro Isobe, Yanrong Zhang, Xiaoying Zhu, Baoliang Chen, Mohamed Ateia, Manabu Fujii

    Water research   282   123645 - 123645   2025.8

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    Authorship：Corresponding author   Language：English   Publishing type：Research paper (scientific journal)  

    The accurate detection of unknown per- and polyfluoroalkyl substances (PFAS) transformation products (TPs) is essential for elucidating degradation pathways and advancing remediation strategies. Herein, we developed a workflow that combined Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR MS) with a paired mass distance (PMD) network. This study achieved high throughput profiling of PFAS TPs with mDa resolving power and sub-ppm mass error. UV treatment revealed chain-shortening pathways, while plasma treatment uncovered competing mechanisms of chain shortening and lengthening, generating oxygen-rich TPs with increased hydrophilicity. Specifically, UV treatment of a 15-PFAS mixture and contaminated natural water showed disappearance of 7 unknown PFAS homologues and the emergence of 12 unknown PFAS homologues. Despite PFAS persistence under UV exposure, previously undetected low-abundance PFAS species were identified, indicating non-negligible photochemical transformation. Under plasma treatment of isolated PFOS, 39 unknown PFAS homologues including 142 suspect and 34 unknown PFAS TPs were identified, highlighting the extensive transformation of emerging and persistent PFAS. Overall, our approach enabled accurate and high-throughput profiling of unknown PFAS TPs and their degradation pathways, providing new insights into persistent unknown PFAS.

    DOI： 10.1016/j.watres.2025.123645

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  • Integrated anaerobic digestion/pyrolysis scheme for sustainable textile-dyeing wastewater and biowaste valorization: A life cycle assessment and techno-economic perspective Reviewed International coauthorship International journal

    Derrick Dadebo, Mona G. Ibrahim, Manabu Fujii, Mahmoud Nasr

    Journal of Water Process Engineering   76   108159 - 108159   2025.8

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    Language：English   Publishing type：Research paper (scientific journal)   Publisher：Elsevier BV  

    DOI： 10.1016/j.jwpe.2025.108159

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  • Qualitatively elucidating the molecular characteristics of precursors for saturated halogenated disinfection byproducts in chlorinated urban eutrophic lake water by ultrahigh-resolution mass spectrometry. Reviewed International coauthorship International journal

    Shixi Wu, Qing-Long Fu, Manabu Fujii, Jibao Liu, Ahmed Elreedy, Xin Yang, Pingqing Fu, Yanxin Wang

    Journal of hazardous materials   489   137709 - 137709   2025.6

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    Language：English   Publishing type：Research paper (scientific journal)  

    Lake eutrophication affects the molecular composition of aquatic dissolved organic matter (DOM) and halogenated disinfection byproducts (Xn-DBPs). However, the effects of autochthonous DOM on the Xn-DBPs formation during disinfection of natural eutrophic water from the perspective of biological metabolism are still poorly revealed. Herein, the natural urban eutrophic lake (UEL) water with slight eutrophication was employed to elucidate the discrepancies in Xn-DBPs formation between autochthonous and allochthonous DOM based on the ultrahigh-resolution mass spectrometry. The number and its proportion of nitrogenous Xn-DBPs in chlorinated UEL water samples were significantly larger (p < 0.05) than those for chlorinated SRNOM. Microbes dominated by Microcystis contributed largely to releasing autochthonous DOM for Xn-DBPs formation upon disinfection. The Xn-DBPs species mainly derived from microorganisms were highly saturated, reduced, bioavailable, nitrogenous, and toxic but lowly oxidized and aromatic than terrestrially derived Xn-DBPs species. Moreover, for the first time, the connection between microbial lipid metabolism and Xn-DBPs species exclusively identified in chlorinated UEL water indicated the considerable contribution of lipid metabolites to saturated Xn-DBPs species. The specific biochemical mechanism of Xn-DBPs formation from autochthonous DOM caused by the lysis of microbe cells highlighted the significant contribution of microbial metabolic activities, particularly lipid metabolism, to the generation of highly saturated and nitrogenous Xn-DBPs during chlorination. This study has also reported a novel data interpretation paradigm for Xn-DBPs research, deepening our understanding towards the formation mechanisms of microbe-derived Xn-DBPs species from the view of microbial metabolic pathways.

    DOI： 10.1016/j.jhazmat.2025.137709

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  • Simultaneous Elucidation of the Chemodiversity of Dissolved Organic Matter and Quantitation of Trace Organic Contaminant Sucralose by Fourier Transform Ion Cyclotron Resonance Mass Spectrometry. Reviewed International coauthorship International journal

    Qian You, Yanhui Cheng, Qing-Long Fu, Guodong Cao, Jibao Liu, Manabu Fujii, Lee Blaney, Pingqing Fu, Yanxin Wang

    Analytical chemistry   97 ( 19 )   10442 - 10451   2025.5

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    Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR MS) has become a cutting-edge technique for molecular characterization of dissolved organic matter (DOM) and trace organic contaminants. Nevertheless, FT-ICR MS is rarely applied to simultaneously elucidate DOM chemodiversity and quantify the concentrations of trace organic contaminants. Compared to conventional solid-phase extraction (SPE), pH-dependent fractionation of DOM molecules using a sequential SPE strategy significantly enhanced the recovery of dissolved organic carbon and yielded more chemical formulas for DOM from environmental samples (p < 0.05). The sequential SPE at circumneutral pH provided exclusive isolation of some hydrogen-rich and oxygen-poor molecules, caused a 5-fold reduction in matrix effects, and improved the detection limits for organic contaminants. The chemical structure of a typical wastewater indicator, sucralose, was successfully validated using FT-ICR MS analysis with tandem mass spectrometry and hydrogen/deuterium exchange measurements. With the standard addition method, the limits of detection and quantitation of FT-ICR MS for sucralose in DOM extracts isolated at circumneutral pH were estimated to be 0.26 and 0.87 μg/L, respectively. The concentrations of sucralose in a representative urban lake measured by FT-ICR MS (e.g., 0.9-4.1 μg/L) were comparable to those determined by liquid chromatography coupled to an Orbitrap mass analyzer. The findings of this study expand application of FT-ICR MS in environmental research by highlighting its potential for identifying trace organic contaminants, quantifying their concentrations, and elucidating the chemodiversity of DOM to inform contaminant sources in aquatic systems.

    DOI： 10.1021/acs.analchem.5c01311

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  • MoleTrans: Browser-Based Webtool for Postanalysis on Molecular Chemodiversity and Transformation of Dissolved Organic Matters via FT-ICR MS

    Jibao Liu, Bei Zhang, Qing-Long Fu, Toshihiro Isobe, Rongjun Gao, Yuansong Wei, Eunsang Kwon, Zhineng Hao, Wei An, Rong Qi, Manabu Fujii

    ENVIRONMENTAL SCIENCE & TECHNOLOGY LETTERS   12 ( 6 )   725 - 730   2025.5

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1021/acs.estlett.5c00284

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  • Development of a Nontargeted Algorithm for Per- and Polyfluoroalkyl Substances in the FT-ICR Mass Spectra of Complex Organic Mixtures. Reviewed International coauthorship International journal

    Qing-Long Fu, Yanhui Cheng, Jibao Liu, Lee Blaney, Caiming Tang, Manabu Fujii, Pingqing Fu, Yanxin Wang

    Analytical chemistry   97 ( 10 )   5698 - 5706   2025.3

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    The unrivaled mass resolving power and subppm mass error enable the application of Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR MS) for nontargeted screening of per- and polyfluoroalkyl substances (PFAS). Few automated FT-ICR MS methods exist for nontargeted analysis of PFAS in solutions containing other dissolved organic matter. In this study, isotopic pattern analysis and dynamic homologous series inspection were complementarily employed in the FTMSDeu algorithm to simultaneously assign chemical formulas for PFAS and other organic molecules, with an overall assignment accuracy of 91.2% for 1,802 unique PFAS formulas and their 11,634 isotopic formulas. The negative effects of fluorine-related isobaric isotopes with sub-mDa mass differences on formula assignment for PFAS and natural organic matter were addressed by an empirical F/(H + X) rule and the adoption of a threshold for the isotopic formula number plus the homologous series number. There were 203 unique PFAS formulas containing one novel PFAS formula, C9H6O4S1I1F11, identified in a fluoropolymer industry-impacted river water sample using our algorithm for analyzing FT-ICR MS spectra. Overall, the results of this study highlighted the great potential of the updated FTMSDeu algorithm for nontargeted and high-throughput chemical assignment for the FT-ICR MS spectra of complex mixtures containing PFAS and dissolved organic matter from real environmental samples.

    DOI： 10.1021/acs.analchem.4c06674

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  • Boosted antibiotic degradation using magnetite nanoparticles doped ultrafine activated charcoal powder to activate H2O2: Insights into mechanisms and competitive kinetics. Reviewed International coauthorship International journal

    Jiahui Zhou, Jibao Liu, Yulong Liu, Xiaofei Wu, Manabu Fujii

    Environmental research   268   120769 - 120769   2025.3

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    The treatment of antibiotic wastewater often faces the challenge of simultaneously and effectively degrading multiple components under complex conditions. To address this challenge, magnetite nanoparticles doped ultrafine activated charcoal powder (MNPs/UACP), which effectively catalyzed the decomposition of H2O2 into •OH and HO2•, was prepared using chemical co-precipitation. Under optimum conditions (i.e., tetracycline (TC) concentration = 100 ppm, pH = 3, H2O2 concentration = 4.9 mM, catalyst dosage = 0.5 g/L), the 50% MNPs/UACP-H2O2 system achieved 97.5% TC removal within 180 min, driven by the synergistic action between adsorption and catalytic oxidation. The stability of 50% MNPs/UACP in recycling was evaluated through repeated reaction cycles, demonstrating that the TC removal efficiency remained at 91.0% even after five cycles. The competition among TC, oxytetracycline (OTC), and chloramphenicol (CAP) in the MNPs/UACP-H2O2 system was closely related to the catalytic oxidation performance, and increasing the proportion of MNPs in MNPs/UACP to above 50% effectively reduced the competition, optimizing degradation efficiency. This study is among the first to provide a comprehensive understanding of adsorption-catalytic oxidation coupled system, offering new insights for broad environmental applications.

    DOI： 10.1016/j.envres.2025.120769

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  • Unveiling molecular DOM reactomics and transformation coupled with multifunctional nanocomposites under anaerobic conditions: Tracking potential metabolomics and pathways. Reviewed International coauthorship International journal

    Manal Ali, Jibao Liu, Eunsang Kwon, Manabu Fujii

    Chemosphere   372   144111 - 144111   2025.3

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    Authorship：Last author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)  

    Anaerobic digestion (AD) offers great potential for pollutant removal and bioenergy recovery. However, it faces challenges when using livestock manure (LSM) as a feedstock given its high content of refractory materials (e.g., lignocellulose, long-chain carbohydrates, lipids, and crude protein). This would significantly inhibit AD-microbial activities, reduce organic transformation efficiency and limit gas production. To overcome this, multifunctional metal-doped hydrochars (HCs) were introduced here as AD supplements/accelerators, given that LSM degradation under AD results in complex dissolved organic matter (DOM). To assess this, the current study investigates the molecular interactions/transformations within DOM during LSM-AD coupled with metal-doped HCs, via batch-mode experiments. Expansive data mining techniques were employed to analyze DOM using Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR MS). Substantial increments in peptide-like along with decrements in highly unsaturated-like molecules were observed in HC@MnCl2 containing-system. This indicates an increased capability for substrate hydrolysis and potential utilization of soluble microbial products (SMPs) (i.e., highly unsaturated-like molecules), leading to enhanced methane recovery (223.23 mL/g-VSadded, 1.77 times more than the control). However, accumulation of DOM-highly unsaturated molecules (i.e., a lack of SMPs' degradation) accompanied with low methane production (39.68 mL/g-VSadded) was noticed for HC@NiFe2O4. DOM reactivity during LSM-AD was validated via paired mass difference molecular network, indicating predominance of CHO and N-containing groups' transformations for HC@MnCl2 and HC@NiFe2O4, respectively. Potential metabolites and abundant pathways were verified via KEGG database. This study improves our understanding of LSM-AD-DOM complex transformation matrix, the fate of bioavailable/recalcitrant compounds, and identification of potential DOM regulators from thousands of molecules.

    DOI： 10.1016/j.chemosphere.2025.144111

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  • Illuminating bioprocess responses to metal-based nanoparticles addition along hydrogen and methane production pathways: A review. Reviewed International coauthorship International journal

    Ahmed Elreedy, Mohamed Elsamadony, Alsayed Mostafa, Johannes Gescher, Omar Y Abdelaziz, Manabu Fujii

    Bioresource technology   417   131824 - 131824   2025.2

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    Recent research has discussed the positive impacts of metal-based nanoparticles (NPs) on bioprocesses producing either hydrogen (H2) or methane (CH4). The enhancement has been explained by mechanisms such as direct interspecies electron transfer (DIET), metal corrosion, and dissimilatory reduction. Such interactions could induce further benefits, such as controlling oxidation-reduction potential (ORP), mitigating toxicants, promoting enzymatic activity, and altering the microbiome, which have not yet been comprehensively discussed. Factors like metal type, oxidation state, and size of NPs are crucial for their reactivity and corresponding responses. This review discusses how different redox potentials of metals can regulate metabolic pathways and how NPs and their reactive ions can eliminate toxicants (e.g., sulfate) and enhance the activity of intra- and extracellular enzymes. The enrichment of responsive microorganisms in correlation with NPs is further discussed. A better understanding of the multifaceted role of metal-based NPs can guide potential new incorporation strategies to improve bioprocesses.

    DOI： 10.1016/j.biortech.2024.131824

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  • Sustainable valorization of agricultural waste into bioplastic and its end-of-life recyclability for biochar production: Economic profitability and life cycle assessment. Invited Reviewed International coauthorship International journal

    Robert Senga, Mahmoud Nasr, Manabu Fujii, Amal Abdelhaleem

    Chemosphere   369   143847 - 143847   2024.12

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    While the industrial sectors have recently focused on producing bioplastic materials, the utilization of edible feedstocks and the generation of wastes and byproducts during the bioplastic synthesis process might delay achieving the environmental sustainability strategy. To overcome these limitations related to bioplastic industrialization, this study focuses on synthesizing bioplastics from waste sources, followed by recycling its end-of-life (e.g., spent and exhausted) material into biochar. Sweet potato peel waste, banana pseudo-stems, and cooking oil waste were used to extract starch, cellulose, and glycerol (a plasticizer) involved in bioplastic manufacturing, respectively. It was found that the cellulose content of 30% w w-1 in bioplastic maintained the best physicochemical, mechanical, and biodegradability properties, recommending a high applicability for food packaging. The exhausted bioplastic was then pyrolyzed to maintain a biochar yield of 32.60 ± 0.89%, avoiding the risk of secondary pollution from waste material disposal. This biochar was utilized to treat wastewater generated from the bioplastic synthesis process, showing the optimum adsorption factors of biochar dosage = 3.81 g L-1, time = 102 min, and solution pH = 7.81. The combined bioplastic production, waste pyrolysis, and wastewater treatment scheme could earn profits from biomaterial sales, carbon credit, and pollution reduction shadow price, maintaining a 6.78-year payback period and a 12.09% internal rate of return. This integrated framework depicted better contributions to the mid-point/end-point life cycle assessment impact categories than the only bioplastic production scenario. This study contributed towards achieving several sustainable development goals (SDGs), including SDG#3: human health protection, SDG#6: wastewater treatment, and SDG#12: waste recycling.

    DOI： 10.1016/j.chemosphere.2024.143847

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  • Incorporating concrete waste as additive in acidic fermentation-A novel approach for enhanced biohydrogen production and concrete mass reduction. International coauthorship International journal

    Ahmed Elreedy, Manal Ali, Yoshiyuki Moriwaki, Nobuhiro Chijiwa, Manabu Fujii

    Journal of environmental management   370   122944 - 122944   2024.11

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    Authorship：Last author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)  

    Acidic fermentation (AF) of organic waste/wastewater generates valuable byproducts, including hydrogen, volatile fatty acids, and ethanol; however, its sensitivity to pH drops limits the stability and efficiency of the process. A reversal process, the acidic chemical treatment of concrete waste (CW) to recycle its aggregates, generates calcium hydroxide, which can serve as buffering agent. Meanwhile, integrating both processes can introduce a sustainable win-win approach, which is the aim of this study. To assess this approach, a series of batch AF experiments were conducted at 50 °C and pH 5.5, using glucose as the substrate. Cementitious specimen (1.5 × 1.5 × 0.8 cm) was supplemented to each 200 mL-fermenter. Unamended fermenters, with and without additional NaHCO3-buffering, were used as controls to compare with the amended ones. Introducing cementitious specimens to AF increased H2-production by 2-fold and 1.7-fold compared to controls with and without NaHCO3-addition, respectively, after three consecutive feed-cycles. The surface analysis of incorporated specimen confirmed the Ca, Al, Mg, and Si leaching. The AF efficiency and resulting cementitious mass reduction were further assessed at different organic loads and specimens' volume, surface area, and porosity (by changing water-to-cement [W/C] ratio). Increasing the organic load from 10 to 20 g-glucose/L resulted in lower H2-production, higher specimen mass reduction (up to ∼32%), and higher Ca2+ release (up to 2 g/L); however, no significant effect was observed when using specimens with higher W/C ratio or surface area. Moreover, the presence of cementitious specimens significantly influenced the microbial composition, leading to notable developments in the abundant genera Thermoanaerobacterium and Bacillus. This study presents a novel approach to sustainably enhancing AF process using CW as both an additive and a treatable substance, with reusable aggregates as a byproduct. It provides valuable insights for optimizing the process and guiding future practical applications. This includes considering various concrete compositions, adjusting organic load conditions, and evaluating long-term stability in larger-scale systems.

    DOI： 10.1016/j.jenvman.2024.122944

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  • Thermodynamics and explainable machine learning assist in interpreting biodegradability of dissolved organic matter in sludge anaerobic digestion with thermal hydrolysis. Reviewed International coauthorship International journal

    Jibao Liu, Chenlu Wang, Jiahui Zhou, Kun Dong, Mohamed Elsamadony, Yufeng Xu, Manabu Fujii, Yuansong Wei, Dunqiu Wang

    Bioresource technology   412   131382 - 131382   2024.11

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    Dissolved organic matter (DOM) is essential in biological treatment, yet its specific roles remain incompletely understood. This study introduces a machine learning (ML) framework to interpret DOM biodegradability in the anaerobic digestion (AD) of sludge, incorporating a thermodynamic indicator (λ). Ensemble models such as Xgboost and LightGBM achieved high accuracy (training: 0.90-0.98; testing: 0.75-0.85). The explainability of the ML models revealed that the features λ, measured m/z, nitrogen to carbon ratio (N/C), hydrogen to carbon ratio (H/C), and nominal oxidation state of carbon (NOSC) were significant formula features determining biodegradability. Shapley values further indicated that the biodegradable DOM were mostly formulas with λ lower than 0.03, measured m/z value higher than 600 Da, and N/C ratios higher than 0.2. This study suggests that a strategy based on ML and its explainability, considering formula features, particularly thermodynamic indicators, provides a novel approach for understanding and estimating the biodegradation of DOM.

    DOI： 10.1016/j.biortech.2024.131382

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  • The application of freeze-thaw cycle treatment on landfill sludge: Impact on physicochemical properties and physical-mechanical characteristics Reviewed International coauthorship

    Xudong Zhang, Peng Ye, Manabu Fujii, Gen Kondo

    Journal of Cleaner Production   468   2024.8

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1016/j.jclepro.2024.143106

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  • Management of Cheese Whey Wastewater and Greywater for Dual Biogas and Biochar Production: A Techno-Economic and Sustainable Approach Reviewed International coauthorship International journal

    Moses Tugume, Mona G. Ibrahim, Manabu Fujii, Mahmoud Nasr

    Waste and Biomass Valorization   15 ( 7 )   4373 - 4393   2024.7

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1007/s12649-024-02458-8

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  • Synthesis of smart ZnO@Mg(OH)<inf>2</inf> core–shell nanocomposite and its application for methylene blue photocatalytic degradation: Life cycle sustainability assessment and techno-economics Reviewed International coauthorship

    Khumbolake Faith Ngulube, Amal Abdelhaleem, Manabu Fujii, Mahmoud Nasr

    Journal of Water Process Engineering   64   2024.7

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1016/j.jwpe.2024.105605

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  • Insight into the mechanism of chlorinated nitroaromatic compounds anaerobic reduction with mackinawite (FeS) nanoparticles. Reviewed International coauthorship International journal

    Changjin Ou, Sujuan Yuan, Fujii Manabu, Ke Shi, Mohamed Elsamadony, Juntong Zhang, Juan Qin, Jian Shi, Zhipeng Liao

    Journal of hazardous materials   471   134451 - 134451   2024.6

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    Anaerobic biotechnology for wastewaters treatment can nowadays be considered as state of the art methods. Nonetheless, this technology exhibits certain inherent limitations when employed for industrial wastewater treatment, encompassing elevated substrate consumption, diminished electron transfer efficiency, and compromised system stability. To address the above issues, increasing interest is being given to the potential of using conductive non-biological materials, e,g., iron sulfide (FeS), as a readily accessible electron donor and electron shuttle in the biological decontamination process. In this study, Mackinawite nanoparticles (FeS NPs) were studied for their ability to serve as electron donors for p-chloronitrobenzene (p-CNB) anaerobic reduction within a coupled system. This coupled system achieved an impressive p-CNB removal efficiency of 78.3 ± 2.9% at a FeS NPs dosage of 1 mg/L, surpassing the efficiencies of 62.1 ± 1.5% of abiotic and 30.6 ± 1.6% of biotic control systems, respectively. Notably, the coupled system exhibited exclusive formation of aniline (AN), indicating the partial dechlorination of p-CNB. The improvements observed in the coupled system were attributed to the increased activity in the electron transport system (ETS), which enhanced the sludge conductivity and nitroaromatic reductases activity. The analysis of equivalent electron donors confirmed that the S2- ions dominated the anaerobic reduction of p-CNB in the coupled system. However, the anaerobic reduction of p-CNB would be adversely inhibited when the FeS NPs dosage exceeded 5 g/L. In a continuous operation, the p-CNB concentration and HRT were optimized as 125 mg/L and 40 h, respectively, resulting in an outstanding p-CNB removal efficiency exceeding 94.0% after 160 days. During the anaerobic reduction process, as contributed by the predominant bacterium of Thiobacillus with a 6.6% relative abundance, a mass of p-chloroaniline (p-CAN) and AN were generated. Additionally, Desulfomonile was emerged with abundances ranging from 0.3 to 0.7%, which was also beneficial for the reduction of p-CNB to AN. The long-term stable performance of the coupled system highlighted that anaerobic technology mediated by FeS NPs has a promising potential for the treatment of wastewater containing chlorinated nitroaromatic compounds, especially without the aid of organic co-substrates.

    DOI： 10.1016/j.jhazmat.2024.134451

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  • Recycling of Egyptian Shammi Corn Stalks for Maintaining Sustainable Cement Industry: Scoring on Sustainable Development Goals Reviewed International coauthorship

    Fajr Qasem, Mahmoud Sharaan, Manabu Fujii, Mahmoud Nasr

    Recycling   9 ( 3 )   2024.6

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.3390/recycling9030034

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  • Delineating suitable zones for solar-based groundwater exploitation using multi-criteria analysis: A techno-economic assessment for meeting sustainable development goals (SDGs) Reviewed International coauthorship

    Ahmed M. Saqr, Mahmoud Nasr, Manabu Fujii, Chihiro Yoshimura, Mona G. Ibrahim

    Groundwater for Sustainable Development   25   2024.5

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1016/j.gsd.2024.101087

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  • A novel humic acid-derived carbon/sulfite system for efficient elimination of pharmaceuticals: Performance, mechanism, toxicity evaluation, and application feasibility Reviewed International coauthorship

    Wei Yang, Yan Zou, Zhihui Pang, Yanrong Zhang, Manabu Fujii

    Chemical Engineering Journal   486   2024.4

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    Authorship：Last author   Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1016/j.cej.2024.149812

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  • Heterogeneous Activation of Sulfite by a Three-Dimensional Printed Hierarchically Porous Copper Catalyst for the Degradation of Tetracycline Hydrochloride in Water Reviewed International coauthorship

    Wei Yang, Guoyan Dang, Manabu Fujii, Chao Cai, Yu Wei, Yanrong Zhang

    ACS ES and T Water   4 ( 4 )   1730 - 1740   2024.4

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1021/acsestwater.3c00771

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  • Photo-production of excited triplet-state of dissolved organic matters in inland freshwater and coastal seawater Reviewed International coauthorship International journal

    Zhongyu Guo, Tingting Wang, Hidetaka Ichiyanagi, Mohamed Ateia, Guo Chen, Jieqiong Wang, Manabu Fujii, Kaichii En, Tiansheng Li, Rumi Sohrin, Chihiro Yoshimura

    Water Research   253   121260 - 121260   2024.4

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  • Impacts of micro- to nano-sized carbon supplements on mixed and archaea-free halophilic cultures when used for bioenergy recovery from saline wastewater Reviewed International coauthorship International journal

    Manal Ali, Ahmed Elreedy, Manabu Fujii

    Journal of Cleaner Production   447   2024.4

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    DOI： 10.1016/j.jclepro.2024.141478

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  • Kraft lignin-derived multi-porous carbon toward sustainable electro-Fenton treatment of emerging contaminants Reviewed International coauthorship International journal

    Bei Zhang, Toshihiro Isobe, Yuta Nabae, Jiawei Hu, Yanrong Zhang, Min Song, Yun Wu, Baoliang Chen, Manabu Fujii

    Resources, Conservation and Recycling   203   2024.4

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  • Synergism of Life Cycle Assessment and Sustainable Development Goals Techniques to Evaluate Downflow Hanging Sponge System Treating Low-Carbon Wastewater Reviewed International coauthorship International journal

    Samuel Anang, Mahmoud Nasr, Manabu Fujii, Mona G. Ibrahim

    Sustainability (Switzerland)   16 ( 5 )   2024.3

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    DOI： 10.3390/su16052035

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  • A technical appraisal of solar photovoltaic-integrated single slope single basin solar still for simultaneous energy and water generation Reviewed International coauthorship International journal

    S. Shanmugan, Karrar A. Hammoodi, T. Eswarlal, P. Selvaraju, Samir Bendoukha, Nabil Barhoumi, Mohamed Mansour, H. A. Refaey, M. C. Rao, Abdel Hamid I. Mourad, Manabu Fujii, Ammar Elsheikh

    Case Studies in Thermal Engineering   54   2024.2

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    DOI： 10.1016/j.csite.2024.104032

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  • Interpretable Machine Learning and Reactomics Assisted Isotopically Labeled FT-ICR-MS for Exploring the Reactivity and Transformation of Natural Organic Matter during Ultraviolet Photolysis Reviewed International coauthorship International journal

    Dhimas Dwinandha, Mohamed Elsamadony, Rongjun Gao, Qing Long Fu, Jibao Liu, Manabu Fujii

    Environmental Science and Technology   58 ( 1 )   816 - 825   2024.1

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    DOI： 10.1021/acs.est.3c05213

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  • FT-ICR MS Spectral Improvement of Dissolved Organic Matter by the Absorption Mode: A Comparison of the Electrospray Ionization in Positive-Ion and Negative-Ion Modes Reviewed International coauthorship International journal

    Qing Long Fu, Chao Chen, Yang Liu, Manabu Fujii, Pingqing Fu

    Analytical Chemistry   96 ( 1 )   522 - 530   2024.1

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    DOI： 10.1021/acs.analchem.3c04651

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  • Synergism of Artificial Intelligence and Techno-Economic for Sustainable Treatment of Methylene Blue Dye-Containing Wastewater by Photocatalysis Reviewed

    Khumbolake Faith Ngulube, Amal Abdelhaleem, Manabu Fujii, Mahmoud Nasr

    Sustainability (Switzerland)   16 ( 2 )   2024.1

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    DOI： 10.3390/su16020529

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  • Machine learning-aided modeling for predicting freshwater production of a membrane desalination system: A long-short-term memory coupled with election-based optimizer Reviewed International coauthorship International journal

    Mohamed Abd Elaziz, Mohamed E. Zayed, H. Abdelfattah, Ahmad O. Aseeri, Elsayed M. Tag-eldin, Manabu Fujii, Ammar H. Elsheikh

    Alexandria Engineering Journal   86   690 - 703   2024.1

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    DOI： 10.1016/j.aej.2023.12.012

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  • Pontederia crassipes utilization for dual phytoremediation and adsorption in greywater treatment: a techno-economic and sustainable approach Reviewed International coauthorship International journal

    Morish Azabo, Amal Abdelhaleem, Manabu Fujii, Mahmoud Nasr

    International Journal of Phytoremediation   26 ( 13 )   2113 - 2126   2024

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    DOI： 10.1080/15226514.2024.2374887

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  • Algae-Bacterial Aerobic Granular Sludge for Surfactant-Laden Saline Industrial Wastewater Treatment: A Sustainable Approach Reviewed

    Hani Ezz, Mahmoud Nasr, Manabu Fujii, Mona G. Ibrahim

    Environmental Science and Engineering   63 - 75   2024

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    DOI： 10.1007/978-3-031-55989-1_7

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  • Photocatalytic Activity of Metal-Doped MgO Nanoparticles for Dye Removal with Cost Estimation Reviewed International coauthorship International journal

    Khumbolake Faith Ngulube, Amal Abdelhaleem, Manabu Fujii, Mahmoud Nasr

    Environmental Science and Engineering   111 - 120   2024

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    DOI： 10.1007/978-3-031-55989-1_10

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  • Room Temperature-Built Gas Sensors from Green Carbon Derivative: A Comparative Study between Pristine SnO2 and GO-SnO2 Nanocomposite Reviewed International coauthorship International journal

    Amoh, P.O., Elwardany, A., Fujii, M., Shokry, H.

    Journal of Nano Research   82   2024

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    DOI： 10.4028/p-8hb3rR

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  • Integrated water quality and performance assessment of seawater desalination plants along two coasts in Egypt Reviewed

    Nada, A., Ibrahim, M.G., Elshemy, M., Fujii, M., Sharaan, M.

    Desalination   586   2024

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  • Defect Engineering Boosted Peroxydisulfate Activation of Dual-Vacancy Cu-Fe Spinel Oxides for Soil Organics Decontamination Reviewed International coauthorship International journal

    Yan Zhao, Bei Zhang, Bing Xia, Zonghao Liu, Chaoqun Tan, Chengye Song, Manabu Fujii, Liang Ma, Min Song

    ACS ES and T Engineering   2024

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    DOI： 10.1021/acsestengg.4c00195

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  • Molecular characterization of coastal seawater dissolved organic matter by ultrahigh-resolution mass spectrometry: a photochemical study of the Tokyo Bay, Japan Reviewed International coauthorship International journal

    Shixi Wu, Manabu Fujii, Qinglong Fu

    Carbon Research   2 ( 1 )   2023.12

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    DOI： 10.1007/s44246-023-00083-z

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  • Prediction of milled surface characteristics of carbon fiber-reinforced polyetheretherketone using an optimized machine learning model by gazelle optimizer Reviewed International coauthorship International journal

    Wajdi Rajhi, Ahmed Mohamed Mahmoud Ibrahim, Abdel Hamid I. Mourad, Mohamed Boujelbene, Manabu Fujii, Ammar Elsheikh

    Measurement: Journal of the International Measurement Confederation   222   2023.11

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    DOI： 10.1016/j.measurement.2023.113627

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  • Insights into the roles of DOM in humification during sludge composting: Comprehensive chemoinformatic analysis using FT-ICR mass spectrometry Reviewed International coauthorship International journal

    Jibao Liu, Ning Wang, Manabu Fujii, Zhen Bao, Jinyi Wei, Zhineng Hao, Qing long Fu, Rongjun Gao, Jingfu Liu, Yuansong Wei

    Chemical Engineering Journal   475   2023.11

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    DOI： 10.1016/j.cej.2023.146024

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  • Apparent quantum yield for photo-production of singlet oxygen in reservoirs and its relation to the water matrix Reviewed International coauthorship International journal

    Zhongyu Guo, Tingting Wang, Guo Chen, Jieqiong Wang, Manabu Fujii, Chihiro Yoshimura

    Water Research   244   120456 - 120456   2023.10

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    DOI： 10.1016/j.watres.2023.120456

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  • Kerf characteristics during CO<inf>2</inf> laser cutting of polymeric materials: Experimental investigation and machine learning-based prediction Reviewed International coauthorship International journal

    Abdulsalam M. Alhawsawi, Essam B. Moustafa, Manabu Fujii, Essam M. Banoqitah, Ammar Elsheikh

    Engineering Science and Technology, an International Journal   46   2023.10

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    DOI： 10.1016/j.jestch.2023.101519

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  • Bioelectrochemical system for enhancing anaerobic digestion of pharmaceutical-containing domestic wastewater Reviewed International coauthorship International journal

    Alsayed Mostafa, Mohamed Elsamadony, Tarek E. Khalil, Amel F. Elhusseiny, Ahmed Tawfik, Manabu Fujii, Ali El-dissouky, Deepak Pant

    Chemosphere   339   139766 - 139766   2023.10

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    DOI： 10.1016/j.chemosphere.2023.139766

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  • Developing smart sustainable irrigation matrix (SIM)-based model for selection of best irrigation techniques: A framework to achieve SDGs Reviewed International coauthorship International journal

    Yasmen Heiba, Mona G. Ibrahim, Abdallah E. Mohamed, Manabu Fujii, Mahmoud Nasr

    Journal of Cleaner Production   420   2023.9

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    DOI： 10.1016/j.jclepro.2023.138404

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  • Enhancement and prediction of a stepped solar still productivity integrated with paraffin wax enriched with nano-additives Reviewed International coauthorship International journal

    Essam Banoqitah, Ravishankar Sathyamurthy, Essam B. Moustafa, Manabu Fujii, Pitchaiah Sudalaimuthu, Fathi Djouider, Ammar H. Elsheikh

    Case Studies in Thermal Engineering   49   2023.9

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    DOI： 10.1016/j.csite.2023.103215

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  • Rapid adsorption of sulfamethazine on mesoporous graphene produced from plastic waste: optimization, mechanism, isotherms, kinetics, and thermodynamics Reviewed International coauthorship International journal

    K. Mensah, M. Samy, H. Mahmoud, M. Fujii, H. Shokry

    International Journal of Environmental Science and Technology   20 ( 9 )   9717 - 9732   2023.9

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    DOI： 10.1007/s13762-022-04646-2

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  • Bench-Scale Continuous-Flow System for Coagulation/Flocculation/Sedimentation Treatment of Washing Bay Effluents: A Comparison between Natural and Chemical Coagulants † Reviewed International coauthorship International journal

    Derrick Dadebo, Mahmoud Nasr, Manabu Fujii, Mona G. Ibrahim

    Engineering Proceedings   37 ( 1 )   2023.7

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    DOI： 10.3390/ECP2023-14693

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  • Performance prediction of aluminum and polycarbonate solar stills with air cavity using an optimized neural network model by golden jackal optimizer Reviewed International coauthorship International journal

    Emad Ghandourah, Y. S. Prasanna, Ammar H. Elsheikh, Essam B. Moustafa, Manabu Fujii, Sandip S. Deshmukh

    Case Studies in Thermal Engineering   47   2023.7

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    DOI： 10.1016/j.csite.2023.103055

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  • Numerical and experimental study on water-heat-salt transport patterns in shallow bare soil with varying salt contents under evaporative conditions: A comparative investigation Reviewed

    Xudong Zhang, Changjian Shu, Manabu Fujii, Yajun Wu, De'an Sun, Peng Ye, Yiding Bao

    Journal of Hydrology   621   129564 - 129564   2023.6

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    DOI： 10.1016/j.jhydrol.2023.129564

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  • Sequential treatment of surfactant-laden wastewater using low-cost rice husk ash coagulant and activated carbon: Modeling, optimization, characterization, and techno-economic analysis Reviewed

    Derrick Dadebo, Mona G. Ibrahim, Manabu Fujii, Mahmoud Nasr

    Bioresource Technology Reports   22   101464 - 101464   2023.6

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    DOI： 10.1016/j.biteb.2023.101464

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  • Improving irrigation schemes using sustainable development goals (SDGs)-related indicators: a case study of tomato production in pot-scale experimentation Reviewed International coauthorship International journal

    Yasmen Heiba, Mahmoud Nasr, Manabu Fujii, Abdallah E. Mohamed, Mona G. Ibrahim

    Environment, Development and Sustainability   26 ( 7 )   17721 - 17747   2023.5

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    DOI： 10.1007/s10668-023-03357-z

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  • Utilizing orange peel waste biomass in textile wastewater treatment and its recyclability for dual biogas and biochar production: a techno-economic sustainable approach Reviewed International coauthorship International journal

    Roice B. Kalengyo, Mona G. Ibrahim, Manabu Fujii, Mahmoud Nasr

    Biomass Conversion and Biorefinery   2023.4

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    DOI： 10.1007/s13399-023-04111-1

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  • Environmental and Economic Evaluation of Downflow Hanging Sponge Reactors for Treating High-Strength Organic Wastewater Reviewed

    Abdelsalam Zidan, Mahmoud Nasr, Manabu Fujii, Mona G. Ibrahim

    Sustainability   15 ( 7 )   6038 - 6038   2023.3

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    DOI： 10.3390/su15076038

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  • Complementary Elucidation of the Molecular Characteristics of Groundwater Dissolved Organic Matter Using Ultrahigh-Resolution Mass Spectrometry Coupled with Negative- and Positive-Ion Electrospray Ionization Reviewed International journal

    Ziqi Zhou, Qing-Long Fu, Manabu Fujii, T. David Waite

    Environmental Science &amp; Technology   57 ( 11 )   4690 - 4700   2023.3

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    DOI： 10.1021/acs.est.2c08816

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  • Effective decontamination of methylene blue from aqueous solutions using novel nano-magnetic biochar from green pea peels Reviewed

    Norbert Onen Rubangakene, Marwa Elkady, Ahmed Elwardany, Manabu Fujii, H. Sekiguchi, Hassan Shokry

    Environmental Research   220   2023.3

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    DOI： 10.1016/j.envres.2023.115272

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  • PdS Coupled Nb<inf>2</inf>O<inf>5</inf> Superstructure for Photocatalytic Overall Water Splitting Reviewed International coauthorship International journal

    Harshavardhan Mohan, Sethumathavan Vadivel, Manabu Fujii, Ga Hyeon Ha, Gitae Kim, Hye Rin Lee, Taeho Shin

    ChemCatChem   15 ( 3 )   2023.2

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    DOI： 10.1002/cctc.202201212

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  • Novel Design of Double Slope Solar Distiller with Prismatic Absorber Basin, Linen Wicks, and Dual Parallel Spraying Nozzles: Experimental Investigation and Energic–Exergic-Economic Analyses Reviewed

    Mohamed E. Zayed, Abdallah Kamal, Mohamed Ragab Diab, Fadl A. Essa, Otto L. Muskens, Manabu Fujii, Ammar H. Elsheikh

    Water   15 ( 3 )   610 - 610   2023.2

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    DOI： 10.3390/w15030610

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  • Water distillation tower: Experimental investigation, economic assessment, and performance prediction using optimized machine-learning model Reviewed International coauthorship International journal

    Ammar H. Elsheikh, Emad M.S. El-Said, Mohamed Abd Elaziz, Manabu Fujii, Hamed R. El-Tahan

    Journal of Cleaner Production   388   135896 - 135896   2023.2

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  • Comprehensive understanding of DOM reactivity in anaerobic fermentation of persulfate-pretreated sewage sludge via FT-ICR mass spectrometry and reactomics analysis Reviewed International coauthorship International journal

    Jibao Liu, Chenlu Wang, Zhineng Hao, Gen Kondo, Manabu Fujii, Qing-Long Fu, Yuansong Wei

    Water Research   229   119488 - 119488   2023.2

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  • Development of a Gaussian-Based Alignment Algorithm for the Ultrahigh-Resolution Mass Spectra of Dissolved Organic Matter Reviewed

    Qing-Long Fu, Manabu Fujii, Rui Ma

    Analytical Chemistry   95 ( 5 )   2796 - 2803   2023.1

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    DOI： 10.1021/acs.analchem.2c04113

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  • Biosorption of Congo Red dye from aqueous solutions using pristine biochar and ZnO biochar from green pea peels Reviewed

    Norbert Onen Rubangakene, Ahmed Elwardany, Manabu Fujii, H. Sekiguchi, Marwa Elkady, Hassan Shokry

    Chemical Engineering Research and Design   189   636 - 651   2023.1

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    DOI： 10.1016/j.cherd.2022.12.003

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  • Evaluation of a Reliable Method for Flash Flood Hazard Mapping in Arid Regions: A Case Study of the Gulf of Suez, Egypt Reviewed

    Mahmoud M. Mansour, Mahmoud Nasr, Manabu Fujii, Chihiro Yoshimura, Mona G. Ibrahim

    Environmental Science and Engineering   103 - 117   2023

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    DOI： 10.1007/978-981-99-1381-7_10

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  • Synthesis and Application of Magnesium-Based Nanoparticles for the Photocatalytic Degradation of Methylene Blue in Aqueous Solutions: Optimization and Kinetic Modeling Reviewed

    Ngulube, K.F., Nasr, M., Fujii, M., Abdelhaleem, A.

    Engineering Proceedings   37 ( 1 )   2023

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    DOI： 10.3390/ECP2023-14636

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  • 地域・管路情報の統合による下水道圧送管の劣化損傷リスク評価システムの開発 Reviewed

    石田大晟, 千々和伸浩, 藤井学, 藤澤健一, 倉田知一

    下水道研究発表会講演集   60th   2023

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  • Optimal Solution for Increasing Groundwater Pumping by Integrating MODFLOW-USG and Particle Swarm Optimization Algorithm: A Case Study of Wadi El-Natrun, Egypt Reviewed

    Ahmed M. Saqr, Mahmoud Nasr, Manabu Fujii, Chihiro Yoshimura, Mona G. Ibrahim

    Environmental Science and Engineering   59 - 73   2023

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    DOI： 10.1007/978-981-99-1381-7_6

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  • Kinetic Modeling of Downflow Hanging Sponge (DHS) System Treating Synthetic Domestic Wastewater † Reviewed

    Zidan, A., Ibrahim, M.G., Fujii, M., Nasr, M.

    Engineering Proceedings   37 ( 1 )   2023

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    DOI： 10.3390/ECP2023-14683

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  • Coated Catalyst Plates for Effective Degradation of Industrial Effluents via Innovative Photocatalytic Reactor Reviewed

    Mahmoud Samy, Mohamed Gar Alalm, Manabu Fujii, Mona G. Ibrahim

    Environmental Science and Engineering   419 - 427   2023

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    DOI： 10.1007/978-3-031-43559-1_40

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  • Effect of Temperature on the Thermolysis of Waste Polyethylene Terephthalate (PET) and Its Application in Methylene Blue Removal Reviewed

    Kenneth Mensah, Hatem Mahmoud, Manabu Fujii, Hassan Shokry

    Environmental Science and Engineering   439 - 447   2023

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    DOI： 10.1007/978-3-031-43559-1_42

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  • Influence of Impregnation of Sodium Carbonate Catalyst on Physicochemical Properties of Biochar † Reviewed

    Norbert Onen Rubangakene, Ahmed Elwardany, Manabu Fujii, Hidetoshi Sekiguchi, Hassan Shokry

    Engineering Proceedings   37 ( 1 )   2023

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    DOI： 10.3390/ECP2023-14688

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  • Insights into conditioning landfill sludge with freeze-thaw method: Effects on the physical-mechanical properties and micro characteristics Reviewed

    Xudong Zhang, Peng Ye, Yajun Wu, Manabu Fujii, Akihiro Takahashi, Yaoyi Wang

    Journal of Cleaner Production   377   134390 - 134390   2022.12

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    DOI： 10.1016/j.jclepro.2022.134390

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  • Swiss-roll electrodes for efficient degradation of carbofuran by electrochemical advanced oxidation processes Reviewed

    Bei Zhang, Toshiya Hiramatsu, Shinji Hamano, Manabu Fujii, Mohamed Gar Alalm, Shiro Yoshikawa, Hideyuki Matsumoto, Shinichi Ookawara

    Journal of Environmental Chemical Engineering   10 ( 6 )   108801 - 108801   2022.12

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    DOI： 10.1016/j.jece.2022.108801

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  • Phytomanagement of textile wastewater for dual biogas and biochar production: A techno-economic and sustainable approach Reviewed

    Gelasius Gregory Msemwa, Mona G. Ibrahim, Manabu Fujii, Mahmoud Nasr

    Journal of Environmental Management   322   116097 - 116097   2022.11

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    DOI： 10.1016/j.jenvman.2022.116097

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  • Facile synthesis of broom stick like FeOCl/g-C3N5 nanocomposite as novel Z-scheme photocatalysts for rapid degradation of pollutants Reviewed

    Sethumathavan Vadivel, Manabu Fujii, Saravanan Rajendran

    Chemosphere   307   135716 - 135716   2022.11

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    DOI： 10.1016/j.chemosphere.2022.135716

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  • A Sustainable Strategy for Petrochemical Wastewater Treatment via Anaerobic Co-Digestion Reviewed

    Anita Atukunda, Mona G. Ibrahim, Manabu Fujii, Shinichi Ookawara, Mahmoud Nasr

    Sustainable Development of Water and Environment   117 - 128   2022.10

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    DOI： 10.1007/978-3-031-07500-1_11

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  • Coagulation/Flocculation Treatment of Carwash Wastewater Using Natural-Based Material: A Sustainable Development Approach Reviewed

    Derrick Dadebo, Mahmoud Nasr, Manabu Fujii, Mona G. Ibrahim

    Sustainable Development of Water and Environment   129 - 139   2022.10

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    DOI： 10.1007/978-3-031-07500-1_12

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  • Preliminary quantitative assessment of the multidimensional impact of the COVID-19 pandemic on Sustainable Development Goals Reviewed

    Mohamed Elsamadony, Manabu Fujii, Masahiro Ryo, Francesco Fuso Nerini, Kaoru Kakinuma, Shinjiro Kanae

    Journal of Cleaner Production   372   133812 - 133812   2022.10

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    DOI： 10.1016/j.jclepro.2022.133812

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  • Heavy metal remediation from wastewater using microalgae: Recent advances and future trends Reviewed

    A.K. Priya, A.A. Jalil, Sethumathavan Vadivel, Kingshuk Dutta, Saravanan Rajendran, Manabu Fujii, Matias Soto-Moscoso

    Chemosphere   305   135375 - 135375   2022.10

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    DOI： 10.1016/j.chemosphere.2022.135375

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  • Bio-coagulation using Cicer arietinum combined with pyrolyzed residual sludge-based adsorption for carwash wastewater treatment: A techno-economic and sustainable approach Reviewed

    Derrick Dadebo, Mahmoud Nasr, Manabu Fujii, Mona G. Ibrahim

    Journal of Water Process Engineering   49   103063 - 103063   2022.10

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    DOI： 10.1016/j.jwpe.2022.103063

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  • Novel S-scheme 2D/2D Bi4O5Br2 nanoplatelets/g-C3N5 heterojunctions with enhanced photocatalytic activity towards organic pollutants removal Reviewed

    Sethumathavan Vadivel, Manabu Fujii, Saravanan Rajendran

    Environmental Research   213   113736 - 113736   2022.10

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    DOI： 10.1016/j.envres.2022.113736

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  • Novel nano-biosorbent materials from thermal catalytic degradation of green pea waste for cationic and anionic dye decolorization Reviewed

    Norbert Onen Rubangakene, Marwa Elkady, Ahmed Elwardany, Manabu Fujii, H. Sekiguchi, Hassan Shokry

    Biomass Conversion and Biorefinery   13 ( 16 )   14873 - 14888   2022.9

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    DOI： 10.1007/s13399-022-03299-y

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  • Visible-Light Photocatalytic Water Splitting and Norfloxacin Degradation by Reduced Graphene Oxide-Coupled MnON Nanospheres Reviewed

    Harshavardhan Mohan, Sethumathavan Vadivel, Pavithra Muthukumar Sathya, Manabu Fujii, Ga Hyeon Ha, Gitae Kim, Taeho Shin

    ACS Applied Energy Materials   5 ( 10 )   12851 - 12859   2022.9

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    DOI： 10.1021/acsaem.2c02455

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  • Dye removal using novel adsorbents synthesized from plastic waste and eggshell: mechanism, isotherms, kinetics, thermodynamics, regeneration, and water matrices Reviewed

    Kenneth Mensah, Hatem Mahmoud, Manabu Fujii, Mahmoud Samy, Hassan Shokry

    Biomass Conversion and Biorefinery   14 ( 12 )   12945 - 12960   2022.9

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    DOI： 10.1007/s13399-022-03304-4

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  • Assessing the Potential of Upcycling Waste Plastics into Mechanically Strong Water-Resistant Thermal Insulation Carbon Foam via Chemical Blowing Method and Low Temperature Carbonization Reviewed

    Kenneth Mensah, Hatem Mahmoud, Manabu Fujii, Hassan Shokry

    Key Engineering Materials   932   21 - 26   2022.9

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    This work presents the recyclability of waste plastics into mechanically strong water-resistant carbon foam by chemical blowing method and low-temperature carbonization. Waste polystyrene (PS) was used as a precursor. The synthetic carbon foam (CF) was characterized using scanning electron microscope (SEM), transmission electron microscope (TEM), energy dispersion X-ray spectroscopy (EDX), C-H-N-S elemental analyzer, X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), thermal constants analyzer and universal compression tester. The synthesized carbon foam exhibits a low density (0.32 g/cm3), low thermal conductivity (0.074 W/m.K), high compressive strength (58 MPa) and high strength/density ratio (181 MPa/g/cm3). The synthesized carbon foam is a potential candidate for thermal insulation in energy-saving buildings and the technology is a simple, cheap, and sustainable approach to managing waste plastics.

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  • Unraveling the metabolic shift in anaerobic digestion pathways associated with the alteration of onion skin waste concentration Reviewed

    Ahmed Tawfik, Alsayed Mostafa, Mohamed Elsamadony, Deepak Pant, Manabu Fujii

    Environmental Research   212   113494 - 113494   2022.9

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    DOI： 10.1016/j.envres.2022.113494

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  • Simulation-Optimization Modeling Techniques for Groundwater Management and Sustainability: A Critical Review Reviewed

    Ahmed M. Saqr, Mona G. Ibrahim, Manabu Fujii, Mahmoud Nasr

    Advanced Engineering Forum   47   89 - 100   2022.8

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    Recently, groundwater resources have been subjected to negative impacts from various natural and anthropogenic factors worldwide. Hence, great efforts have been conducted in the literature to find the best management strategies for protection against groundwater quantity shortage and aquifer material contamination. Simulation-optimization (S-O) modeling has been considered one of the most feasible options for groundwater management, providing high accuracy in understanding the complex real-world water issues. This review study aims at clarifying the concepts, techniques, and stepwise methodologies of both simulation models and optimization algorithms, in addition to the applications of the integrated S-O approach in solving groundwater problems. Besides, the linkages between applications of the S-O framework and sustainable development goals (SDGs) from quantity and quality perspectives are illustrated to show the expected beneficial outcomes for various socio-economic and environmental issues in different fields. Based on this review, conclusions are drawn that may be useful for future studies related to groundwater conservation, management, and planning.

    DOI： 10.4028/p-50l1j1

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  • Recent Applications of Flash Flood Hazard Assessment Techniques: Case Studies from Egypt and Saudi Arabia Reviewed

    Mahmoud M. Mansour, Mona G. Ibrahim, Manabu Fujii, Mahmoud Nasr

    Advanced Engineering Forum   47   101 - 110   2022.8

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    Flash floods are severe natural disasters due to their suddenness, frequency, and destruction. Every year, flash floods occur in Egypt and Saudi Arabia, which are located in the heart of the Middle East. Extensive areas in Egypt and Saudi Arabia are covered by mountainous topography. Intense rainfall can generate flash floods with their magnitude dependent on geomorphology and storm characteristics. Flash flood hazard assessment is a feasible way to mitigate potential damage and losses. Illumination, review, and comparison of assessment techniques of flash flood hazards represent an urgent necessity to evaluate advances and challenges in this discipline. Google-scholar and Scopus were used to collect 50 recent scientific papers, most of them published between 2011 and 2021, using the keywords: floods, hazards, assessment, Egypt, Saudi Arabia. Remote Sensing (RS) and Geographic Information systems (GIS) are the cornerstones of these studies, which include the Digital Elevation Model (DEM) and geoprocessing tools. The two items facilitate the calculation of morphometric parameters. Dividing the area and determining the hazard level were the main steps in flash flood hazard assessment. The considered studies relied on varied sets of morphometric parameters that ranged from 3 to 24 morphometric parameters. Area, ruggedness ratio, basin shape index, stream frequency, slope index, and drainage density are the common parameters in the assessment of flash flood hazards. In a flood zone, buildings made from brick have better sustainability in terms of both global warming mitigation and life cycle cost than other materials. Future studies are essential to illustrate the relationships between different morphometric parameters and flash flood hazard degree through field data and define a reliable unified set of morphometric parameters to assess the flash flood hazard degree.

    DOI： 10.4028/p-03z404

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  • Development of an Internal Calibration Algorithm for Ultrahigh-Resolution Mass Spectra of Dissolved Organic Matter Reviewed

    Qing-Long Fu, Manabu Fujii, Eunsang Kwon

    Analytical Chemistry   94 ( 30 )   10589 - 10594   2022.7

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    DOI： 10.1021/acs.analchem.2c01342

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  • Dual biogas/biochar production from anaerobic co-digestion of petrochemical and domestic wastewater: a techno-economic and sustainable approach Reviewed

    Anita Atukunda, Mona G. Ibrahim, Manabu Fujii, Shinichi Ookawara, Mahmoud Nasr

    Biomass Conversion and Biorefinery   14 ( 7 )   8793 - 8803   2022.6

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    DOI： 10.1007/s13399-022-02944-w

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  • Primary Production Reviewed

    Say Samal, Uk Sovannara, Ly Sophanna, Rajendra Khanal, Dilini Kodikara, Sok Ty, Oeurng Chantha, Manabu Fujii, Chihiro Yoshimura

    Water and Life in Tonle Sap Lake   319 - 329   2022.6

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    DOI： 10.1007/978-981-16-6632-2_31

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  • Bacterial Communities: Their Dynamics and Interactions with Physicochemical Factors Reviewed

    Vannak Ann, Porsry Ung, Chanthol Peng, Manabu Fujii, Yasunori Tanji, Kazuhiko Miyanaga

    Water and Life in Tonle Sap Lake   275 - 283   2022.6

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    DOI： 10.1007/978-981-16-6632-2_27

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  • Microcystin Production and Oxidative Stress Reviewed

    Kota Nakatani, Kohei Nasukawa, Tetsuro Kikuchi, Manabu Fujii, Kazuhiko Miyanaga, Yasunori Tanji, Vannak Ann

    Water and Life in Tonle Sap Lake   285 - 293   2022.6

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    DOI： 10.1007/978-981-16-6632-2_28

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  • Transition towards Sustainable Carwash Wastewater Management: Trends and Enabling Technologies at Global Scale Reviewed

    Derrick Dadebo, Mona G. Ibrahim, Manabu Fujii, Mahmoud Nasr

    Sustainability   14 ( 9 )   5652 - 5652   2022.5

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    DOI： 10.3390/su14095652

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  • Influence of cysteine, serine, sulfate, and sulfide on anaerobic conversion of unsaturated long-chain fatty acid, oleate, to methane Reviewed

    Sepehr Shakeri Yekta, Ahmed Elreedy, Tong Liu, Mattias Hedenström, Simon Isaksson, Manabu Fujii, Anna Schnürer

    Science of The Total Environment   817   152967 - 152967   2022.4

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    DOI： 10.1016/j.scitotenv.2022.152967

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  • Sustainable development goals (SDGs) associated with flash flood hazard mapping and management measures through morphometric evaluation Reviewed

    Mahmoud M. Mansour, Mona G. Ibrahim, Manabu Fujii, Mahmoud Nasr

    Geocarto International   37 ( 26 )   11116 - 11133   2022.3

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    DOI： 10.1080/10106049.2022.2046868

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  • Prediction of reaction mechanism for OH radical-mediated phenol oxidation using quantum chemical calculation Reviewed International coauthorship International journal

    Dhimas Dwinandha, Bei Zhang, Manabu Fujii

    Chemosphere   291   132763 - 132763   2022.3

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    DOI： 10.1016/j.chemosphere.2021.132763

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  • On the potential of halophiles enriched from hypersaline sediments for biohydrogen production from saline wastewater Reviewed

    Manal Ali, Manabu Fujii, Mona G. Ibrahim, Ahmed Elreedy

    Journal of Cleaner Production   341   130901 - 130901   2022.3

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    DOI： 10.1016/j.jclepro.2022.130901

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  • Petrochemical Wastewater Treatment by Eggshell Modified Biochar as Adsorbent: Atechno-Economic and Sustainable Approach Reviewed

    Andy G. Kumi, Mona G. Ibrahim, Manabu Fujii, Mahmoud Nasr

    Adsorption Science &amp; Technology   2022   1 - 13   2022.2

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    DOI： 10.1155/2022/2323836

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  • Novel nano-ferromagnetic activated graphene adsorbent extracted from waste for dye decolonization Reviewed

    Kenneth Mensah, Hatem Mahmoud, Manabu Fujii, Hassan Shokry

    Journal of Water Process Engineering   45   102512 - 102512   2022.2

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    DOI： 10.1016/j.jwpe.2021.102512

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  • Enhanced Removal of Methylene Blue Dye by Sustainable Biochar Derived from Rice Straw Digestate

    Ezz, H., Ibrahim, M.G., Fujii, M., Nasr, M.

    Key Engineering Materials   932   2022

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    DOI： 10.4028/p-ss5269

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  • Production of High Carbon Composite from Catalytic Pyrolysis of Pisum sativum Peels for Methylene Blue Dye Decolorization

    Rubangakene, N.O., Elwardany, A., Fujii, M., Sekiguchi, H., Shokry, H.

    Key Engineering Materials   935   2022

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    DOI： 10.4028/p-41b2v3

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  • Strengthen “the sustainable farm” concept via efficacious conversion of farm wastes into methane Reviewed

    Ahmed Tawfik, Gamal K. Hassan, Hanem Awad, Marwa Hassan, Patricia Rojas, Jose L. Sanz, Mohamed Elsamadony, Deepak Pant, Manabu Fujii

    Bioresource Technology   341   125838 - 125838   2021.12

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    DOI： 10.1016/j.biortech.2021.125838

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  • Sustainable Development Goals (SDGs) Associated with Groundwater Over-Exploitation Vulnerability: Geographic Information System-Based Multi-criteria Decision Analysis

    Ahmed M. Saqr, Mona G. Ibrahim, Manabu Fujii, Mahmoud Nasr

    Natural Resources Research   30 ( 6 )   4255 - 4276   2021.12

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    DOI： 10.1007/s11053-021-09945-y

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  • Doping of Ni in MIL-125(Ti) for enhanced photocatalytic degradation of carbofuran: Reusability of coated plates and effect of different water matrices Reviewed

    Mahmoud Samy, Mohamed Gar Alalm, Manabu Fujii, Mona G. Ibrahim

    Journal of Water Process Engineering   44   102449 - 102449   2021.12

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    DOI： 10.1016/j.jwpe.2021.102449

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  • First-Year Quantitative Assessment of the Multidimensional Impact of the COVID-19 Pandemic on Sustainable Development Goals Reviewed

    Mohamed Elsamadony, Manabu Fujii, Masahiro Ryo, Francesco Fuso Nerini, Kaoru Kakinuma, Shinjiro Kanae

    SSRN Electronic Journal   82 - 82   2021.11

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    DOI： 10.2139/ssrn.3970225

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  • Co-metabolism based adaptation of anaerobes to phenolic saline wastewater in a two-phase reactor enables efficient treatment and bioenergy recovery Reviewed

    Manal Ali, Ahmed Elreedy, Manabu Fujii, Ahmed Tawfik

    Energy Conversion and Management   247   114722 - 114722   2021.11

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    DOI： 10.1016/j.enconman.2021.114722

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  • Enhancement of Biogas Production from Anaerobic Co-Digestion of Rice Straw and Thickened Waste Activated Sludge with Hydrodynamic Cavitation Pretreatment Reviewed

    Hani Ezz, Mahmoud Nasr, Manabu Fujii, Mona. G Ibrahim

    2021 10th International Conference on Renewable Energy Research and Application (ICRERA)   82 - 87   2021.9

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    DOI： 10.1109/icrera52334.2021.9598484

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  • A Survey of Household Water Use and Groundwater Quality Index Assessment in a Rural Community of Cambodia Reviewed

    Saret Bun, Sreymao Sek, Chantha Oeurng, Manabu Fujii, Phaly Ham, Pisut Painmanakul

    Sustainability   13 ( 18 )   10071 - 10071   2021.9

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    DOI： 10.3390/su131810071

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  • A New Formula Assignment Algorithm for the Deuterium Labeled Ultrahigh-Resolution Mass Spectrometry: Implications to the Formation Mechanism of Halogenated Disinfection Byproducts Reviewed

    Qing-Long Fu, Manabu Fujii, Akari Watanabe, Eunsang Kwon

    Analytical Chemistry   94 ( 3 )   1717 - 1725   2021.9

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    DOI： 10.26434/chemrxiv-2021-cjw3m

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  • Dual biogas and biochar production from rice straw biomass: a techno-economic and sustainable development approach Reviewed

    Hani Ezz, Mona G. Ibrahim, Manabu Fujii, Mahmoud Nasr

    Biomass Conversion and Biorefinery   13 ( 12 )   10807 - 10821   2021.9

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    DOI： 10.1007/s13399-021-01879-y

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  • Upcycling of Polystyrene Waste Plastics to High Value Carbon by Thermal Decomposition Reviewed

    Kenneth Mensah, Hatem Mahmoud, Manabu Fujii, Hassan Shokry

    Key Engineering Materials   897   103 - 108   2021.8

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    DOI： 10.4028/www.scientific.net/kem.897.103

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  • Fatigue of anammox consortia under long-term 1, 4-dioxane exposure and recovery potential: N-kinetics and microbial dynamics

    Sherif Ismail, Ahmed Elreedy, Manabu Fujii, Shou-Qing Ni, Ahmed Tawfik, Mohamed Elsamadony

    Journal of Hazardous Materials   Vol. 414   2021.7

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    DOI： 10.1016/j.jhazmat.2021.125533

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  • Response of anammox bacteria to short-term exposure of 1, 4-dioxane: Bacterial activity and community dynamics

    Sherif Ismail, Ahmed Elreedy, Mohamed Elsamadony, Esraa Abdelrazek, Manabu Fujii, Shou-Qing Ni, Ahmed Tawfik

    Separation and Purification Technology   Vol. 266   2021.7

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    DOI： 10.1016/j.seppur.2021.118539

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  • Intermittent versus sequential dark-photo fermentative hydrogen production as an alternative for bioenergy recovery from protein-rich effluents

    Naira Meky, Ahmed Elreedy, Mona G Ibrahim, Manabu Fujii, Ahmed Tawfik

    Energy   Vol. 217   2021.2

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    DOI： 10.1016/j.energy.2020.119326

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  • Possible transmission of viruses from contaminated human feces and sewage: Implications for SARS-CoV-2 International journal

    Elsamadony M., Fujii M., Takayuki Miura, Toru Watanabe

    Science of the Total Environment   Vol. 755 ( 1 )   142575 - 142575   2021.2

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    DOI： 10.1016/j.scitotenv.2020.142575

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  • Export of dissolved iron from river catchments in Northeast Japan.

    Yuta Endo, Ayman Allam, Masafumi Natsuike, Chihiro Yoshimura, Manabu Fujii

    Landscape and Ecological Engineering   Vol. 17 ( 2 )   75 - 84   2021.2

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    DOI： 10.1007/s11355-020-00435-6

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  • Visible-light-driven photocatalytic disinfection of raw surface waters (300 - 5000 CFU/mL) using reusable coated Ru/WO3/ZrO2

    Mohamed Fouad, Mohamed Gar Alalm, Hisham Kh El-Etriby, Daria Camilla Boffito, Shinichi Ookawara, Teruhisa Ohno, Manabu Fujii

    Journal of Hazardous Materials   Vol. 402   2021.1

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    DOI： 10.1016/j.jhazmat.2020.123514

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  • Unraveling the capability of graphene nanosheets and γ-Fe2O3 nanoparticles to stimulate anammox granular sludge

    Elreedy A., Ismail S., Ali M., S-Q Ni, Manabu Fujii, Elsamadony M.

    Journal of Environmental Management, Elsevier, 2020.   Vol. 277   2021.1

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    DOI： 10.1016/j.jenvman.2020.111495

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  • Advances towards understanding long chain fatty acids-induced inhibition and overcoming strategies for efficient anaerobic digestion process

    Mohamed Elsamadony, Alsayed Mostafa, Manabu Fujii, Ahmed Tawfik, Deepak Pant

    Water Research   190   2020.12

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  • Contrasting Impacts of pH on the Abiotic Transformation of Hydrochar-Derived Dissolved Organic Matter Mediated by δ-MnO2

    Ping Wu, Qing-Long Fu, Xiangdong Zhu, Cun Liu, Fei Dang, Karin Müller, Manabu Fujii, Dong-Mei Zhou, Hailong Wang

    Geoderma   Vol. 378   2020.11

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    DOI： 10.1016/j.geoderma.2020.114627

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  • Photocatalytic degradation of organic micropollutants: inhibition mechanisms by different fractions of natural organic matter.

    Dion Awfa, Mohamed Ateia, Manabu Fujii, Chihiro Yoshimura

    Water Research   Vol. 174 ( No. 115643 )   2020.11

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    DOI： 10.1016/j.watres.2020.115643

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  • MIL-53(Al)/ZnO coated plates with high photocatalytic activity for extended degradation of trimethoprim via novel photocatalytic reactor

    Samy M., Ibrahim M. G., Alalm M. G., Fujii M.

    Separation and Purification Technology   Vol. 249   2020.10

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    DOI： 10.1016/j.seppur.2020.117173

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  • Development and Application of a High-Precision Algorithm for Non-Target Identification of Organohalogens Based on Ultrahigh-Resolution Mass Spectrometry

    Fu Q-L., Manabu Fujii, Kwon E.

    Analytical Chemistry   92 ( 20 )   13989 - 13996   2020.9

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    DOI： 10.1021/acs.analchem.0c02899

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  • Synthesis of sludge-derived biochar modified with eggshell waste for monoethylene glycol removal from aqueous solutions

    Kumi, A.G., Ibrahim, M.G., Fujii, M., Nasr, M.

    SN Applied Sciences   2 ( 10 )   2020.9

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    DOI： 10.1007/s42452-020-03501-8

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  • Innovative photocatalytic reactor for the degradation of chlorpyrifos using a coated composite of ZrV2O7 and graphene nano-platelets

    Samy M., Ibrahim M. G., Alalm M. G., Fujii M., Elkady M., Essam K.

    Chemical Engineering Journal   Vol. 395   2020.9

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    DOI： 10.1016/j.cej.2020.124974

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  • Development and Comparison of Formula Assignment Algorithms for Ultrahigh-resolution Mass Spectra of Natural Organic Matter

    Fu Q-L, Fujii M., Riedel T.

    Analytica Chimica Acta   Vol. 1125   247 - 257   2020.8

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    DOI： 10.1016/j.aca.2020.05.048

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  • Long-Term Assessment of 1, 4-Dioxane Uptake via Duckweed with Emphasis on Operational Parameters

    Rania Osama, Mona G Ibrahim, Ahmed Elreedy, Manabu Fujii

    Materials Science Forum   Vol. 1008   2020.8

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  • Biochar Synthesis for Industrial Wastewater Treatment: A Critical Review

    Andy G Kumi, Mona G Ibrahim, Mahmoud Nasr, Manabu Fujii

    Materials Science Forum   Vol. 1008   2020.8

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    DOI： 10.4028/www.scientific.net/MSF.1008.202

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  • Modeling and Optimization of Photocatalytic Degradation of Methylene Blue Using Lanthanum Vanadate

    Mahmoud Samy, Mona G Ibrahim, Mohamed Gar Alalm, Manabu Fujii

    Materials Science Forum   Vol. 1008   2020.8

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  • Effect of hazardous industrial solid waste landfill leachate on the geotechnical properties of clay

    Safia M Khodary, Amr Z Elwakil, Manabu Fujii, Ahmed Tawfik

    Arabian Journal of Geosciences   Vol. 13 ( Issue 15 )   2020.7

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    DOI： 10.1007/s12517-020-05699-8

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  • Synthesis, characterization and adsorption properties of sewage sludge derived biochar modified with eggshell

    Andy G Kumi, Mona G Ibrahim, Mahmoud Nasr, Manabu Fujii

    2020.6

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    DOI： 10.1109/ASET48392.2020.9118226

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  • Application of CNTs/LaVO4 on photocatalytic degradation of methylene blue in different contact modes

    Mahmoud Samy, Mona G Ibrahim, Mohamed Gar Alalm, Manabu Fujii

    2020.6

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    DOI： 10.1109/ASET48392.2020.9118260

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  • Management of Aquaculture and Marine Environment in an Open-Type Inner Bay Through the Satoumi Approach: The Case of Shizugawa Bay

    Teruhisa Komatsu, Shuji Sasa, Shigeru Montani, Osamu Nishimura, Takashi SAKAMAKI, Chihiro Yoshimura, Manabu Fujii, Tetsuo Yanagi

    Evolution of Marine Coastal Ecosystems under the Pressure of Global Changes   393 - 407   2020.6

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    DOI： 10.1007/978-3-030-43484-7_26

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  • Relative Effect of Additional Solid Media on Bubble Hydrodynamics in Bubble Column and Airlift Reactors towards Mass Transfer Enhancement

    Prajak Sastaravet, Saret Bun, Kritchart Wongwailikhit, Nattawin Chawaloesphonsiya, Manabu Fujii, Pisut Painmanakul

    Processes   Vol. 8 ( Issue 6 )   1 - 16   2020.6

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    DOI： 10.3390/pr8060713

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  • Application of magnetic multi-wall carbon nanotube composite into fermentative treatment process of ultrasonicated waste activated sludge

    Mostafa A., Tolba A., Alalm M. G., Fujii M., Afify H., Elsamadony M.

    Bioresource Technology   Vol. 306   2020.6

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    DOI： 10.1016/j.biortech.2020.123186

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  • Iron uptake kinetics by coastal micro- and macro-algae in relation to riverine and coastal organic matter. Reviewed

    Masafumi Natsuike, Yuta Endo, H Ito, Manami Miyamoto, Chihiro Yoshimura, Manabu Fujii

    Estuarine, Coastal and Shelf Science   Vol. 235 ( No. 106580 )   2020.4

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    DOI： 10.1016/j.ecss.2019.106580

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  • Effective photocatalytic degradation of sulfamethazine by CNTs/LaVO4 in suspension and dip coating modes Reviewed

    Samy, M, Mona Gamal Eldin Ibrahim, MG Alalm, Manabu Fujii

    Separation and Purification Technology   Vol. 235 ( No. )   116138 - 116138   2020.3

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    DOI： 10.1016/j.seppur.2019.116138

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  • Photocatalytic degradation of Trimethoprim using S-TiO2 and Ru/WO3/ZrO2 immobilized on reusable fixed plates Reviewed

    Samy M., Mona Gamal Eldin Ibrahim, MG Alalm, Manabu Fujii, Ookawara S., Ohno T.

    Journal of Water Process Engineering   Vol. 33 ( No. )   101023 - 101023   2020.2

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    DOI： 10.1016/j.jwpe.2019.101023

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  • CNTs/MOF-808 painted plates for extended treatment of pharmaceutical and agrochemical wastewaters in a novel photocatalytic reactor

    Samy M., Ibrahim M. G., Alalm M. G., Fujii M.

    Chemical Engineering Journal   Vol. 406   2020.2

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    DOI： 10.1016/j.cej.2020.127152

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  • Integrated dark-photo fermentative hydrogen production from synthetic gelatinaceous wastewater via cost-effective hybrid reactor at ambient temperature Reviewed

    Meky N., Elreedy A., Ibrahim M. G., Fujii M.

    Energy Conversion and Management   Vol. 203   112250 - 112250   2020.1

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    DOI： 10.1016/j.enconman.2019.112250

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  • Paperboard mill wastewater treatment via combined dark and LED-mediated fermentation in the absence of external chemical addition Reviewed

    Elsharkawy K., Elsamadony M., MG Alalm, Manabu Fujii, Afify H., Ahmed Tawfik

    Bioresource Technology   Vol. ( No. )   122312 - 122312   2020.1

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    DOI： 10.1016/j.biortech.2019.122312

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  • Robustness of anaerobes exposed to cyanuric acid contaminated wastewater and achieving efficient removal via optimized co-digestion scheme

    Abdullahi K., Elreedy A., Fujii M., Ibrahim M. G., Tawfik A.

    Journal of Advanced Research   Vol. 24   211 - 222   2020

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    DOI： 10.1016/j.jare.2020.02.006

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  • Evaluation of aquifer vulnerability using PCA technique and various clustering methods

    Bashir Rahmani, Saman Javadi, Seied Mehdy Hashemy Shahdany

    Geocarto International   36 ( 18 )   2117 - 2140   2019.11

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    Publishing type：Research paper (scientific journal)   Publisher：Informa UK Limited  

    DOI： 10.1080/10106049.2019.1690057

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  • Environmental Changes in Tonle Sap Lake and its Floodplain:Status and Policy Recommendations.

    Raj SHIVAKOTI Binaya, Pham Ngoc BAO, Seingheng Hul, Chihiro Yoshimura, Sovannara UK, Khanal Rajendra, Sokly Siev, Aiko YAMASHITA, Hideto FUJII, Tomohiro TANAKA, Hidekazu YOSHIOKA, Yoichi Fujihara, Keisuke Hoshikawa, Sarann LY, Lun Sambo, Heng Sokchhay, Ty Sok, Mong Marith, Chantha OEURNG, Layheang Song, Fidero Kuok, Ty Boreborey, Phat Chanvorleak, eden-gan mariqui, Winarto Kurniawan, HIROFUMI HINODE, Porsry Ung, Reasmey Tan, Vannak Ann, Chanthol Peng, Manabu Fujii, Kazuhiko Miyanaga, YASUNORI TANJI

    2019.11

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    Language：English   Publisher：Institute for Global Environmental Strategies,Tokyo Institute of Technology,Institute of Technology of Cambodia  

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  • Novel Magnetic Carbon Nanotube-TiO2 Composites for Solar Light Photocatalytic Degradation of Pharmaceuticals in the Presence of Natural Organic Matter Reviewed

    Dion Awfa, Mohamed Ateia, Manabu Fujii, Chihiro Yoshimura

    Journal of Water Process Engineering   Vol. 31 ( No. )   100836 - 100836   2019.10

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    DOI： 10.1016/j.jwpe.2019.100836

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  • The impact of urban greening and urban geometry on the microclimate at the neighborhood level in hot arid climates

    Tahani Ahmed Elbondira, Mona Gamal Eldin Ibrahim, Manabu Fujii

    2019 Advances in Science and Engineering Technology International Conferences, ASET 2019   2019.5

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    Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：Institute of Electrical and Electronics Engineers Inc.  

    DOI： 10.1109/ICASET.2019.8714445

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  • Toward Realizing the Sustainable use of and  Healthy Marine Environments in an Open-Type Enclosed Bay.

    T Komatsu, S Sakamoto, S Sawayama, H Murata, S Sasa, S Montani, H Yatabe, N Yokoji, H Seko, Nakano Y, Manabu Fujii, Ayman Allam, Masafumi Natsuike, H Ito, Chihiro Yoshimura, T Sakamaki, O Nishimura

    Integrated Coastal Management in the Japanese Satoumi   15 - 57   2019.5

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    Language：English   Publishing type：Part of collection (book)   Publisher：In Integrated Coastal Management in the Japanese Satoumi, Ed. Yanagi T  

    DOI： 10.1016/b978-0-12-813060-5.00002-x

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  • Assessing the Agricultural Drainage Water with Water Quality Indices in El-Salam Canal Mega Project, Egypt Reviewed

    W Assar, Mona Gamal Eldin Ibrahim, WE Mahmod, Manabu Fujii

    Water (Switzerland)   Vol. 11 ( No. 5 )   1013 - 1013   2019.5

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    DOI： 10.3390/w11051013

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  • 2章3節 森は海の恋人か：鉄, 柳哲雄編:里海管理論―きれいで豊かで賑わいのある持続可能な海 Reviewed

    藤井学, 夏池真史, 伊藤紘晃, 吉村千洋

    農林統計協会   Vol.   368 - 368   2019.4

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  • Hydrogen and methane bio-production and microbial community dynamics in a multi-phase anaerobic reactor treating saline industrial wastewater Reviewed

    Ali M., A Elreedy, Ibrahim M. G., Manabu Fujii, Tawfik A

    Energy Conversion and Management   Vol. 186 ( No. )   1 - 14   2019.4

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    DOI： 10.1016/j.enconman.2019.02.060

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  • Iron uptake by bloom-forming freshwater cyanobacterium Microcystis aeruginosa in natural and effluent waters Reviewed International journal

    Fu Q-L, Manabu Fujii, Masafumi Natsuike, T. D. Waite

    Environmental pollution (Barking, Essex : 1987)   Vol. 247 ( No. )   392 - 400   2019.4

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    DOI： 10.1016/j.envpol.2019.01.071

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  • Lectin-stimulated cellular iron uptake and toxin generation in the freshwater cyanobacterium Microcystis aeruginosa Reviewed

    Tomoko Takaara, Sasaki S, Manabu Fujii, Hiroaki Ito, Yoshifumi Masago, Tatuo Omura

    HARMFUL ALGAE   Vol. 83 ( No. )   25 - 33   2019.3

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    DOI： 10.1016/j.hal.2019.01.003

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  • Enhanced fermentative hydrogen production from industrial wastewater using mixed culture bacteria incorporated with iron, nickel, and zinc-based nanoparticles Reviewed

    A Elreedy, Tawfik A, Manabu Fujii, Mitsuhiko Koyama, Kiyohiko Nakasaki

    Water Research   Vol. 151 ( No. )   349 - 361   2019.3

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    DOI： 10.1016/j.watres.2018.12.043

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  • Psychrophilic hydrogen production from petrochemical wastewater via anaerobic sequencing batch reactor: techno-economic assessment and kinetic modelling Reviewed

    Elreedy A, Manabu Fujii, Tawfik A

    International Journal of Hydrogen Energy   Vol. 44 ( No. 11 )   5189 - 5202   2019.2

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    DOI： 10.1016/j.ijhydene.2018.09.091

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  • Physico-chemical and microbial characterization of compartment-wise profiles in an Anammox Baffled Reactor Reviewed

    Ismail S., Elsamadony M., A Elreedy, Manabu Fujii, Ahmed Tawfik

    Journal of Environmental Management   Vol. 232 ( No. )   875 - 886   2019.2

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    DOI： 10.1016/j.jenvman.2018.11.134

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  • Physiological responses of the freshwater N2‐fixing cyanobacterium Raphidiopsis raciborskii to Fe and N availabilities Reviewed

    Fu Q-L, Yeung, A. C. Y., Manabu Fujii, Masafumi Natsuike, T. D. Waite

    Environmental Microbiology   Vol. 21 ( No. 4 )   1211 - 1223   2019.1

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    DOI： 10.1111/1462-2920.14545

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  • Statistical Assessment of Rainfall Characteristics in Upper Blue Nile Basin over the Period from 1953 to 2014 Reviewed

    Arockiam Samy, Mona Gamal Eldin Ibrahim, Wael Elham M. S. Mahmod, Manabu Fujii, Amr Eltawil, Daoud W.

    Water (Switzerland)   Vol. 11 ( No. 3 )   468 - 468   2019.1

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    DOI： 10.3390/w11030468

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  • Biological hydrogen gas production from gelatinaceous wastewater via stand-alone circular dark/photo baffled fermenter

    Naira Meky, Manabu Fujii, Mona G Ibrahim, Ahmed Tawfik

    Energy Procedia   Volume 157   670 - 675   2019.1

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    DOI： 10.1016/j.egypro.2018.11.232

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  • Evaluation and optimization of anammox baffled reactor (AnBR) by artificial neural network modeling and economic analysis Reviewed

    Ismail S., Elsamadony M., Manabu Fujii, Ahmed Tawfik

    Bioresource Technology   Vol. 271 ( No. )   500 - 506   2019.1

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    DOI： 10.1016/j.biortech.2018.09.004

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  • Prediction of reactive sites in the hydroxyl radical-mediated oxidation pathway of phenol by using quantum chemical calculation

    Manabu Fujii

    Journal of Japan Society of Civil Engineers, Ser. G (Environmental Research)   vol. 75 ( issue 7 )   2019

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  • 量子化学計算を用いたフェノール酸化分解過程での反応点の推定 Reviewed

    藤井 学

    土木学会論文集G(環境)   Vol. 75 ( No. 7 )   2019

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  • Regulating acidogenesis and methanogenesis for the separated bio-generation of hydrogen and methane from saline-to-hypersaline industrial wastewater Reviewed

    Ali Manal, A Elreedy, Mona Gamal Eldin Ibrahim, Manabu Fujii, Kouta Nakatani, Ahmed Tawfik

    Journal of Environmental Management   Vol. 250 ( No. )   109546 - 109546   2019

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    DOI： 10.1016/j.jenvman.2019.109546

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  • Effect of Dissolved Metal Ion Concentration on Toxin Production of Freshwater Cyanobacteria

    Kota Nakatani, Kohei Nasukawa, Hiroki Matsumae, Wang Wei, Tetsuro Kikuchi, Manabu Fujii

    Journal of Japan Society of Civil Engineers, Ser. G (Environmental Research)   Volume 75 ( Issue 7 )   2019

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  • The role of autochthonous organic matter in radioactive cesium accumulation to riverine fine sediments Reviewed

    Manabu Fujii, Keisuke Oono, Chihiro Yoshimura, Manami Miyamoto

    Water Research   Vol. 137   18 - 27   2018.6

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    Language：English   Publishing type：Research paper (scientific journal)   Publisher：Elsevier Ltd  

    DOI： 10.1016/j.watres.2018.02.063

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  • Studies on a Coastal Environment Management Method for an Open-type Bay: the Case of Shizugawa Bay in Southern Sanriku Coast.

    T Komatsu, S Sasa, S Montani, Chihiro Yoshimura, Manabu Fujii, Masafumi Natsuike, O Nishimura, T Sakamaki, T Yanagi

    Bulletin on Coastal Oceanography   Vol. 56 ( No. 1 )   2018.4

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  • Photodegradation of Pharmaceuticals and Personal Care Products in Water Treatment Using Carbonaceous-TiO2 Composites: A Critical Review of Recent Literature. Reviewed

    Dion Awfa, Mohamed Ateia, Manabu Fujii, MS Johnson, Chihiro Yoshimura

    Water Research   142 ( No. 142 )   26 - 45   2018.4

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  • 微量金属動態からみる下水・川・海のつながり～スマートな地域環境管理に向けて～

    吉村千洋, 夏池真史, 藤井学

    月刊下水道   Vol. 41 ( No. 5 )   41 - 45   2018.3

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  • Temporal variability in Cu speciation, phytotoxicity, and soil microbial activity of Cu-polluted soils as affected by elevated temperature Reviewed

    Fu, Q-L, Weng N., Manabu Fujii, Zhoul D. M.

    Chemosphere   Vol. 194 ( No. )   285 - 296   2018.3

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    DOI： 10.1016/j.chemosphere.2017.11.183

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  • EFFECTS OF LAND COVER ON DISSOLVED IRON LOADING AND ITS LOAD UNIT IN THE KITAKAMI MOUNTAINS IN WINTER Reviewed

    遠藤雄大, 夏池真史, 宮本真奈美, 吉村千洋, 藤井学

    土木学会論文集 B1(水工学)(Web)   Vol. 74 ( No. 4 )   I_535 - III_540   2018.2

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  • Photochemical generation and decay kinetics of superoxide and hydrogen peroxide in the presence of standard humic and fulvic acids Reviewed

    Manabu Fujii, Otani, E.

    Water Research   Vol. 123 ( No. )   642 - 654   2017.10

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    DOI： 10.1016/j.watres.2017.07.015

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  • Treatment of hypersaline hazardous landfill leachate using a baffled constructed wetland system: effect of granular packing media and vegetation Reviewed

    Meky N, Manabu Fujii, Tawfik A.

    Environmental Technology (United Kingdom)   Vol. 40 ( No. 4 )   1 - 11   2017.10

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1080/09593330.2017.1397764

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  • Nickel-graphene nanocomposite as a novel supplement for enhancement of biohydrogen production from industrial wastewater containing mono-ethylene glycol. Reviewed

    A Elreedy, E Ibrahim, N Hassan, A El-Dissouky, Manabu Fujii, Chihiro Yoshimura, A Tawfik

    Energy Conversion and Management   Vol. 140   133 - 144   2017.5

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    DOI： 10.1016/j.enconman.2017.02.080

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  • Variation of iron redox kinetics and its relation with molecular composition of standard humic substances at circumneutral pH. Reviewed

    Ying Ping Lee, Manabu Fujii, Tetsuro Kikuchi, Koumei Terao, Chihiro Yoshimura

    PLOS ONE   Vol. 12 ( No. 4 )   2017.4

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    DOI： 10.1371/journal.pone.0176484

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  • Importance of allochthonous and autochthonous dissolved organic matter in Fe(II) oxidation: A case study in Shizugawa Bay watershed, Japan Reviewed

    Ying Ping Lee, Manabu Fujii, Tetsuro Kikuchi, Masafumi Natsuike, H Ito, Toru Watanabe, Chihiro Yoshimura

    Chemosphere   180   221 - 228   2017.4

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    DOI： 10.1016/j.chemosphere.2017.04.008

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  • Effects of the chemical characteristics and concentration of inorganic suspended solids on nitrification in freshwater. Reviewed

    LeQuynh Nga, Chihiro Yoshimura, Manabu Fujii

    Water Science and Technology   Vol. 76 ( No. 11 )   3101 - 3113   2017.2

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    DOI： 10.2166/wst.2017.404

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  • Correlations between aromaticity of dissolved organic matter and trace metal concentrations in natural and effluent waters: A case study in the Sagami River Basin, Japan Reviewed

    Tetsuro Kikuchi, Manabu Fujii, Koumei Terao, Jiwei Ran, Ying Ping Lee, Chihiro Yoshimura

    Science of the Total Environment   Vol. 576   36 - 45   2017.1

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    DOI： 10.1016/j.scitotenv.2016.10.068

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  • The relationship between molecular composition and fluorescence properties of humic substances. Reviewed

    Mohamed Ateia, Jiwei Ran, Manabu Fujii, Chihiro Yoshimura

    International Journal of Environmental Science and Technology.   14 ( 4 )   867 - 880   2017.1

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    DOI： 10.1007/s13762-016-1214-x

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  • Feasibility of using non-vegetated baffled submerged constructed wetland system for removal of heavy metals, COD and nutrients from hyper-saline hazardous landfill leachate. Reviewed

    N Meky, Manabu Fujii, Chihiro Yoshimura, A Tawfic

    Desalination and Water Treatment   98   254 - 265   2017.1

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    Language：English   Publishing type：Research paper (scientific journal)   Publisher：Desalination Publications  

    DOI： 10.5004/dwt.2017.21738

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  • Factors affecting on hythane bio-generation via anaerobic digestion of mono-ethylene glycol contaminated wastewater: Inoculum-to-substrate ratio, nitrogen-to-phosphorus ratio and pH Reviewed

    Elreedy, A., Manabu Fujii, Tawfik, A.

    Bioresource Technology   Vol. 223 ( No. )   10 - 19   2017.1

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    DOI： 10.1016/j.biortech.2016.10.026

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  • Effect of turbulence on nitrification rate in freshwater column. Reviewed

    Kornravee Saipetch, LeQuynh Nga, Manabu Fujii, Chihiro Yoshimura

    Journal of Japan Society of Civil Engineers   Ser.B1 ( 73 )   I_1201 - I_1206   2017

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    DOI： 10.2208/jscejhe.73.I_1201

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  • Trace Metal Speciation in Urban and Natural Rivers and Effluent Waters: a Case Study in the Sagami River Basin Reviewed

    Mitsuo Wada, Manabu Fujii

    Journal of Japan Society of Civil Engineers, Ser. G (Environmental Research)   Volume 73 ( Issue 7 )   I_535 - III_540   2017

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    DOI： 10.2208/jscejer.73.III_17

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  • Cellular characteristics and growth behavior of iron-limited Microcystis aeruginosa in nutrient-depleted and nutrient-replete chemostat systems Reviewed

    M. Fujii, T. C. Dang, M. W. Bligh, T. D. Waite

    Limnology and Oceanography   61 ( 6 )   2151 - 2164   2016.11

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    DOI： 10.1002/lno.10360

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  • Chemical Speciation and Bioavailability of Iron in Natural Waters - Linkage of Forest, River and Sea in View of Dynamics of Iron and Organic Matter Reviewed

    Masafumi NATSUIKE, Tetsuro KIKUCHI, Ying Ping LEE, Hiroaki ITO, Manabu FUJII, Chihiro YOSHIMURA, Toru WATANABE

    Journal of Japan Society on Water Environment   Vol. 39 ( No. 6 )   197 - 210   2016.7

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    DOI： 10.2965/jswe.39.197

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  • Cellular characteristics and growth behavior of iron-limited Microcystis aeruginosa in nutrient-depleted and nutrient-replete chemostat systems Reviewed

    Manabu Fujii, Dang, T.C., Bligh, M.W., Waite T.D.

    Limnology and Oceanography   Vol. 61 ( No. 6 )   2151 - 2164   2016.7

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    DOI： 10.1002/lno.10360

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  • Effect of dissolved organic matter on Fe(II) oxidation in natural and engineered waters. Reviewed

    Ying Ping Lee, Manabu Fujii, Tetsuro Kikuchi, Chihiro Yoshimura

    Water Research   Vol. 103   160 - 169   2016.6

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    DOI： 10.1016/j.watres.2016.07.033

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  • Nonlinear relationship between near-bed velocity and growth of riverbed periphyton. Reviewed

    Mohamed Ateia, M Nasr, Akira Ikeda, H Okada, Manabu Fujii, Masafumi Natsuike, Chihiro Yoshimura

    Water   Vol. 8:461 ( No. 10 )   461   2016

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    DOI： 10.3390/w8100461

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  • SATOUMI APPROACH FOR REALIZING SUSTAINABLE COASTAL USE IN A RIAS-TYPE BAY: A CASE OF SHIZUGAWA BAY IN SANRIKU COAST HIT BY THE HUGE TSUNAMI ON 11 MARCH 2011

    Teruhisa Komatsu, Shuji Sasa, Shigeru Montani, Osamu Nishimur, Takashi Sakamaki, Chihiro Yoshimura, Manabu Fujii, Tetsuo Yanagi

    2016

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  • Effect of concentration and size of inorganic suspended solids on microbial-mediated nitrogen transformation in freshwater column. Reviewed

    Le Quynhnga, Chihiro Yoshimura, Manabu Fujii

    Sustainable Environment Research   Vol. 25 ( 6 )   315 - 322   2015.10

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  • Organic matter removal from saline agricultural drainage wastewater using a moving bed biofilm reactor. Reviewed

    Mohamed Ateia, M Nasr, Chihiro Yoshimura, Manabu Fujii

    Water Science and Technology   Vol. 72 ( No. 8 )   1327 - 1333   2015.7

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  • Competitive Effects of Calcium and Magnesium Ions on the Photochemical Transformation and Associated Cellular Uptake of Iron by the Freshwater Cyanobacterial Phytoplankton Microcystis aeruginosa Reviewed

    Manabu Fujii, Yeung, A.C.Y., Waite, T.D.

    Environmental Science and Technology   Vol. 49 ( No. 15 )   9133 - 9142   2015.7

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    DOI： 10.1021/acs.est.5b01583

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  • Dissolved nitrogen release from coarse and amphipod-produced fine particulate organic matter in freshwater column. Reviewed

    Le Quynhnga, Manabu Fujii, Chihiro Yoshimura, K Tockner

    Limnology   Vol. 17 ( 1 )   33 - 46   2015.6

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    DOI： 10.1007/s10201-015-0458-3

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  • Specific global responses to N and Fe nutrition in toxic and non-toxic Microcystis aeruginosa Reviewed

    Alexova, R., Dang, T.C., Manabu Fujii, Raftery, M.J., Waite, T.D., Ferrari, B.C., Neilan, B.A.

    Environmental Microbiology   Vol. 18 ( No. 2 )   401 - 413   2015.6

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  • Effect of ionic strength on ligand exchange kinetics between a mononuclear ferric citrate complex and siderophore desferrioxamine B Reviewed

    Hiroaki Ito, Manabu Fujii, Yoshifumi Masago, Waite T.D., Tatuo Omura

    Geochimica et Cosmochimica Acta   Vol. 154   81 - 97   2015.4

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    DOI： 10.1016/j.gca.2015.01.020

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  • Heavy metals in suspended sediment in rivers flowing through megacities in Southeast Asia. Reviewed

    Chihiro Yoshimura, Chikako Yamanaka, Manabu Fujii, Suchat Leungpraser, MAN Tanchuling

    ASEAN Engineering Journal   Vol. C4 ( No. 1 )   63 - 72   2015.2

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  • 自然水及び処理水中における溶存態微量金属と溶存有機物の分子特性との関係

    菊池哲郎, 藤井学, 吉村千洋

    月刊海洋   Vol. ( No. 11月号 )   80 - 89   2015

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    DOI： 10.14862/geochemproc.62.0_263

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  • 各種森林及び農耕地から供給される有機鉄の特性比較分析. Reviewed

    桜庭 敬之, 伊藤 紘晃, 藤井学, LeeYing Ping, 梶原 晶彦, 吉村千洋, 渡部 徹

    土木学会論文集G（環境）   Ser.G ( 71(7) )   III_287 - III_295   2015

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  • Effects of molecular composition of natural organic matter on ferric iron complexation at circumneutral pH Reviewed

    Manabu Fujii, Akira Imaoka, Chihiro Yoshimura, T. D. Waite

    Environmental Science & Technology   Vol. 48 ( Issue 8 )   4414 - 4424   2014.3

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  • Effect of Chemical Properties of Humic Substances on Oxidation Rate of Ferrous Iron in Natural Waters Reviewed

    Koumei TERAO, Manabu FUJII, Tetsuro KIKUCHI, Chihiro YOSHIMURA

    Journal of Japan Society of Civil Engineers, Ser. G (Environmental Research)   Vol. 69 ( No. Ⅲ )   III_291 - III_299   2013.11

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  • Effect of Natural Organic Matter on Iron Uptake by the Freshwater Cyanobacterium Microcystis aeruginosa Reviewed

    Manabu Fujii

    Environmental Science & Technology   Vol. 48 ( No. 4 )   365 - 374   2013.11

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    DOI： 10.1021/es404090h

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  • Seasonal and spatial distribution of labile heavy metals in suspended sediment of the lower Chao Phraya river,Thailand.

    Chikako Yamanaka, Chihiro Yoshimura, Manabu Fujii, Suchat Leungpraser, Pitakkomtorn Puttipong, TADAHARU ISHIKAWA

    Journal of Science and Technology   Volume 51 ( Number 2B )   2013.5

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  • Kinetics of iron oxidation by dissolved oxygen and hydrogen peroxide in the presence of different type of humic substances.

    Koumei Terao, Manabu Fujii, Akira Imaoka, Chihiro Yoshimura

    Journal of Science and Technology   Volume 51 ( Number 2B )   2013.5

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  • Effect of Chemical Properties of Humic Substances on Iron Complexation in Natural Waters Reviewed

    IMAOKA Akira, FUJII Manabu, YOSHIMURA Chihiro

    PROCEEDINGS OF ENVIRONMENTAL AND SANITARY ENGINEERING RESEARCH   68 ( 7 )   III_525 - III_533   2012.11

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    It is important to understand complexation between humic substances and iron in view of the assessment of iron bioavailability in natural water environment. In this study, iron complexation by humic substances from a variety of origins were investigated by measuring stability constant and complexation capacity using the competitive ligand method. In addition, relationship between such complexation parameters and chemical properties of humic substances was examined. Statistically significant positive correlation between the complexation capacity and amount of aromatic carbons of humic substances (as determined by 13C-NMR) was provided. Therefore, functional groups resident in aromatic region are likely responsible for iron coordination. In addition, stability constant has significant correlation with sulfer and nitrogen content of humics (as determined by elemental analysis), suggesting that sulfonic and amino groups bind to iron with higher stability constant.

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  • Effect of habitat condition and fine particulate sediment on oxygen consumption rate in a river floodplain Reviewed

    OKADA Shiena, ITO Jun, YOSHIMURA Chihiro, MASUYAMA Takaaki, FUJII Manabu

    PROCEEDINGS OF ENVIRONMENTAL AND SANITARY ENGINEERING RESEARCH   68 ( 7 )   III_205 - III_215   2012.11

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    In this study, we investigated i) relationship between habitat type and qualitative and quantitative characteristics of deposited sediment and (ii) the characteristics of deposited sediment and respiration activity of the sediment as determined by oxygen consumption rate in a floodplain of the Tagliamento River. Field observation indicated that C/N ratio and size of sediment increased in upstream-connected backwater and main stream, while habitats with high abundance of trees provided high density of fine particulate sediment (FPS) as well as high content of fine particulate organic matter (FPOM). We confirmed that the FPS density and FPOM content have strong correlation with dissolved oxygen consumption rate, suggesting that the oxygen consumption rate in water column is influenced by habitat type and quality and quantity of sediments.

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  • Monosaccharide composition of the outer membrane lipopolysaccharide and O-chain from the freshwater cyanobacterium Microcystis aeruginosa NIES-87 Reviewed

    Manabu Fujii, Sato, Y., Ito H, Masago Y., Tatuo Omura

    Journal of Applied Microbiology   Vol. 113 ( No. 4 )   896 - 903   2012.7

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    DOI： 10.1111/j.1365-2672.2012.05405.x

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  • Mechanism of light-mediated generation of hydrogen peroxide in the presence of humic substance

    Erika Otani, Manabu Fujii, Chihiro Yoshimura

    Thai Environmental Engineering Journal   2012.6

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  • Speciation of heavy metals in a highly turbid river in Thailand

    Chikako Yamanaka, Chihiro Yoshimura, Manabu Fujii, S Leungpraser, P Pitakkomtorn, TADAHARU ISHIKAWA

    Thai Environmental Engineering Journal   2012.6

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  • Iron uptake by toxic and non-toxic strains of Microcystis aeruginosa Reviewed

    Manabu Fujii

    Applied and Environmental Microbiology   Vol. 77 ( No. 19 )   7068 - 7071   2012.1

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    DOI： 10.1128/AEM.05270-11

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  • Effect of pH and Ionic Strength on Ligand Exchange Reaction between Ferric Fulvic Acid and Siderophore Desferrioxamine B Reviewed

    ITO Hiroaki, FUJII Manabu, MASAGO Yoshifumi, WATANABE Toru, OMURA Tatsuo

    PROCEEDINGS OF ENVIRONMENTAL AND SANITARY ENGINEERING RESEARCH   Vol. 68 ( No. 7 )   III_535 - III_543   2012

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    Effect of pH and ionic strength on the ligand exchange reaction between ferric fulvic acid and siderophore (desferrioxamine B) was examined in the range from pH 6.0 to 9.0 and ionic strength from 0.01 to 0.7 M. The results showed that higher pH rendered higher ligand exchange reaction rate in the pH greater than 8.0. On the other hand, in the pH below 8.0, the ligand exchange rate constants was found to vary less than an order of magnitude. Ionic strength resulted in insignificant changes of the ligand exchange rate constants. These results suggest that pH plays important role in the ligand exchange reaction in coastal and seawaters and the lakes under algal bloom where pH typically exceeds 8.0.

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  • Characteristics of the freshwater cyanobacterium Microcystis aeruginosa grown in iron-limited continuous culture Reviewed

    Manabu Fujii, Waite T.D.

    Applied and Environmental Microbiology   78 ( 5 )   1574 - 1583   2011.12

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    DOI： 10.1128/AEM.06908-11

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  • Comment on "Application of a superoxide (O2-) thermal source (SOTS-1) for the determination and calibration of O2- fluxes in seawater" by Heller and Croot Reviewed

    Manabu Fujii, Waite T.D.

    Analytica Chimica Acta   Vol. 702 ( No. 19 )   144 - 145   2011.9

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  • 毒であるのは単なる偶然？ラン藻毒ミクロシスチンの生理学的役割とは？

    藤井学

    月刊化学   Vol. 66 ( No. 10月号 )   62 - 63   2011.9

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  • Mechanism and Kinetics of Ligand Exchange between Ferric Citrate and Desferrioxamine B Reviewed

    Hiroaki Ito, Manabu Fujii, Masago Y, Chihiro Yoshimura, Waite T.D., Tatuo Omura

    The Journal of Physical Chemistry   Vol. 115 ( No. 22 )   5371 - 5379   2011.5

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  • Effect of Fe(II) and Fe(III) transformation kinetics on iron acquisition by a toxic strain of Microcystis aeruginosa Reviewed

    Chihiro Yoshimura, Manabu Fujii, Tockner K

    Environmental Science & Technology   Vol. 44 ( No. 6 )   1980 - 1986   2011.2

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    DOI： 10.1021/es901315a

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  • Effect of Light on Iron Uptake by the Freshwater Cyanobacterium Microcystis aeruginosa Reviewed

    M Fujii, TC Dang, AL Rose, T Omura, TD Waite

    Environmental science & technology   Volume 45 ( Issue 4 )   1391 - 1398   2011.2

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    DOI： 10.1021/es103311h

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  • Iron uptake and toxin synthesis in the bloom-forming Microcystis aeruginosa under iron limitation Reviewed

    Manabu Fujii

    Environmental Microbiology   Vol. 13 ( No. 4 )   1064 - 1077   2011.1

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    DOI： 10.1111/j.1462-2920.2010.02412.x

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  • クエン酸第二鉄錯体とシデロフォアdesferrioxamine Bのリガンド交換反応に及ぼすイオン強度とpHの影響 Reviewed

    伊藤紘晃, 藤井学, 真砂佳史, 大村達夫

    土木学会論文集G(環境)   67 ( 7 )   III_541 - III_552   2011

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  • Spatial distribution of deposited sediment and soil environmental property in the ecotone between Sagae dam reservoir and an inflowing river Reviewed

    Takaaki MASUYAMA, Chihiro YOSHIMURA, Manabu FUJII, Jun ITO, Erika OTANI

    Ecology and Civil Engineering   Volume 14 ( Issue 2 )   103 - 114   2011

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  • Oxygen and Superoxide-Mediated Redox Kinetics of Iron Complexed by Humic Substances in Coastal Seawater Reviewed

    Manabu Fujii, Waite T.D., Tatuo Omura

    Environmental Science & Technology   Vol. 44 ( No. 24 )   9337 - 9342   2010.11

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    DOI： 10.1021/es102583c

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  • Instream release of dissolved organic matter from coarse and fine particulate organic matter of different origins Reviewed

    Chihiro Yoshimura, Manabu Fujii, Tatsuo Omura, Klement Tockner

    BIOGEOCHEMISTRY   100 ( 1-3 )   151 - 165   2010.9

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    DOI： 10.1007/s10533-010-9412-y

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  • アルミニウムと藻類由来有機物の錯形成速反応速度論 Reviewed

    伊藤紘晃, 藤井学, 真砂佳史, 大村達夫

    環境工学研究論文集   Vol. 47 ( No. )   109 - 118   2010.9

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  • Spatial and Temporal Distribution of Humic-Iron Complex in Matsushima Bay

    Tatuo Omura, Manabu Fujii

    Vol. 1 ( No. )   23 - 34   2010.2

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  • Effect of Natural Organic Matter on Oxidation and Reduction Rates of Iron in Coastal Water

    M Fujii, T Omura

    Proceedings from the 2010 AGU Ocean Sciences Meeting   2010

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  • 沿岸域において鉄の酸化還元反応に及ぼす自然有機物質の影響 Reviewed

    藤井学, 大村達夫

    環境工学研究論文集   Vol. 46 ( No. )   593 - 603   2009.11

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  • Microcystis spp.由来莢膜成分の特性及び凝集阻害能評価 Reviewed

    真砂佳史, 藤井学, 大村達夫

    環境工学研究論文集   Vol. 47 ( No. )   643 - 650   2009.9

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  • フルボ酸第二鉄錯体とシデロフォアDesferrioxamine Bのリガンド交換速度論モデルの構築 Reviewed

    伊藤紘晃, 藤井学, 真砂佳史, 大村達夫

    水環境学会誌   Vol. 32 ( No. 10 )   557 - 564   2009

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  • Effect of Divalent Cations on Ligand-Exchange Kinetics of Fe (III) -Fulvic Acid Complex and Siderophore Desferrioxamine B Reviewed

    ITO Hiroaki, FUJII Manabu, MASAGO Yoshifumi, OMURA Tatsuo

    Japan journal of water pollution research   Vol. 33 ( No. 9 )   131 - 139   2009

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    The effect of divalent cations (Me: Ca2+ and Mg2+) on the ligand-exchange kinetics of Fe (III) -fulvic acid complex and desferrioxamine B (DFOB) was examined by spectrophotometrically measuring the rate of Fe (III) -DFOB complex formation at the various concentrations of Me found in natural water (0-50 mM) . A kinetic model for ligand-exchange incorporating the effects of Me was also developed. The model includes the following two pathways: (1) a disjunctive pathway where Fe (III) -fulvic acid complex initially dissociates followed by complexation of free Fe (III) by DFOB; and (2) an adjunctive pathway where DFOB directly associates with the Fe (III) -fulvic acid complex followed by dissociation of the ternary complex (DFOB-Fe (III) -fulvic acid) to form Fe (III) -DFOB. The ligand-exchange rates of both pathways were accelerated in the presence of Me. The enhanced rates were well explained by considering the ternary complex formation of Me and Fe (III) -fulvic acid complex.

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  • 自然水中での鉄の形態変化と藻類鉄摂取機構

    藤井 学, 大村 達夫, Trevor Waite

    日本陸水学会 講演要旨集   74   134 - 134   2009

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  • Kinetic model of ligand exchange between Fe (III)-fulvic acid complex and siderophore desferrioxamine B

    Hiroaki Ito, Manabu Fujii, Yoshifumi Masago, Tatsuo Omura

    Journal of Japan Society on Water Environment (Japan)b   Volume 32 ( Issue 10 )   2009

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  • Superoxide-mediated Fe(II) production from organically complexed Fe(III) in coastal waters Reviewed

    Manabu Fujii, Hiroaki Ito, Rose A. L., Waite T.D., Tatuo Omura

    GEOCHIMICA ET COSMOCHIMICA ACTA   Vol. 72 ( No. )   6079 - 6089   2008.12

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    DOI： 10.1016/j.gca.2008.09.029

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  • Effect of extracellular superoxide generation on the growth and iron uptake of Microcystis aeruginosa Reviewed

    Manabu Fujii, TD Waite, Tatuo Omura

    ENVIRONMENTAL ENGINEERING RESEARCH   Volume 45   147 - 155   2008.11

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    Iron is one of the most important micronutrients for the growth of M.aeruginosa, one of the cyanobacteria forming toxic blooms in closed freshwater systems of the world. Recent studies have shown that the extracellular reduction of ferric iron mediated by superoxide is a key step in the process of iron acquisition by some marine phytoplankton. However, little is known about the iron uptake associated with superoxide generation. We investigated the effect of extracellular superoxide generation on the growth and iron uptake of M. aeruginosa. Our results suggested that superoxide generation associated with cell surface and ferrous iron form can participate in iron uptake.

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  • Transformation dynamics and reactivity of dissolved and colloidal iron in coastal waters Reviewed

    Manabu Fujii, Hitoaki Ito, Rose A. L., Waite T.D., Tatuo Omura

    MARINE CHEMISTRY   Vol. 110 ( No. )   165 - 175   2008.6

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    DOI： 10.1016/j.marchem.2008.04.005

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  • Effect of divalent cations on the kinetics of Fe(III) complexation by organic ligands in natural waters Reviewed

    Manabu Fujii, Rose A. L., Waite T.D., Tatuo Omura

    GEOCHIMICA ET COSMOCHIMICA ACTA   Vol. 72 ( No. )   1335 - 1349   2008.3

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  • Mechanism of Superoxide-Mediated Fe(II) Production from Organically Complexed Fe(III) in Coastal Seawater : Kinetic Model of Fe(II) Production Developed Using Fe(III)-Citrate Complex

    FUJII Manabu, FUCHIGAMI Yosuke, ITO Hiroaki, WAITE T. David, OMURA Tatsuo

    Japan journal of water pollution research   Vol. 31 ( No. 2 )   101 - 108   2008

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    Superoxide radical produced during algal metabolism is one of the most important agents that contribute to the transformation of the Fe(III)-organic ligand complex to more bioavailable Fe(II). In this work, we investigated the kinetics of superoxide-mediated Fe(II) production from Fe(III) complexed by citrate (Fe(III)Cit) in coastal seawater on the basis of a laboratory experiment and a kinetic model. To simulate a coastal environment, Fe(III)Cit samples with various ratios of citrate concentration to iron concentration (ligand/Fe ratio) were incubated for five minutes to one week in seawater medium. Then, Fe(II) production rate was spectrophotometrically measured by detecting the ferrous-ferrozine complex. During the measurement, superoxide was constantly generated by oxidizing xanthine. Fe(II) production rate generally decreased with incubation time, since Fe(III)Cit as a source of Fe(II) gradually dissociated to form less reactive iron oxyhydroxide in coastal seawater. However, when the ligand/Fe ratio was sufficiently high, the dissociation of Fe(III)Cit was suppressed and Fe(II) was formed at a relatively higher rate over one week. These results demonstrated that Fe(II) production rate is largely influenced by ligand/Fe ratio and incubation time. The kinetic model developed was in good agreement with the experimentally determined Fe(II) production rates.

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  • Mechanism of Superoxide-Mediated Fe (II) Production from Organically Complexed Fe (III) in Coastal Seawater: Kinetic Model of Fe (II) Production Developed Using Fe (III)-Citrate Complex

    Manabu Fujii, Yosuke Fuchigami, Hiroaki Ito, TD Waite, Tatsuo Omura

    Mizu Kankyo Gakkaishi/Journal of Japan Society on Water Environmentu   Volume 31 ( Issue 2 )   101 - 108   2008

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    Superoxide radical produced during algal metabolism is one of the most important agents that contribute to the transformation of the Fe(III)-organic ligand complex to more bioavailable Fe(II). In this work, we investigated the kinetics of superoxide-mediated Fe(II) production from Fe(III) complexed by citrate (Fe(III)Cit) in coastal seawater on the basis of a laboratory experiment and a kinetic model. To simulate a coastal environment, Fe(III)Cit samples with various ratios of citrate concentration to iron concentration (ligand/Fe ratio) were incubated for five minutes to one week in seawater medium. Then, Fe(II) production rate was spectrophotometrically measured by detecting the ferrous-ferrozine complex. During the measurement, superoxide was constantly generated by oxidizing xanthine. Fe(II) production rate generally decreased with incubation time, since Fe(III)Cit as a source of Fe(II) gradually dissociated to form less reactive iron oxyhydroxide in coastal seawater. However, when the ligand/Fe ratio was sufficiently high, the dissociation of Fe(III)Cit was suppressed and Fe(II) was formed at a relatively higher rate over one week. These results demonstrated that Fe(II) production rate is largely influenced by ligand/Fe ratio and incubation time. The kinetic model developed was in good agreement with the experimentally determined Fe(II) production rates.

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  • Ligand-Exchange Kinetics of Fe (III)-Citrte Complex with Desferrioxamine B in the Presence of Divalent Metals Reviewed

    Hiroaki ITO, Manabu FUJII, Shiori SASAKI, T D WAITE, Tatsuo OMURA

    ENVIRONMENTAL ENGINEERING RESEARCH   Volume 44   115 - 125   2007.11

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    We have developed a kinetic model for ligand-exchange reaction of ferric iron-citrate complex (FeCit) with desferrioxamine B (DFB) in the presence of divalent metals (Ca and Mg). The kinetic model considers (1) a disjunctive pathway where DFB binds to Fe following the dissociation of FeCit and (2) an adjunctive pathway where FeDFB is formed via the direct association of DFB to FeCit. The rate constants for the complex reaction in the disjunctive pathway estimated from the model well described the experimentally determined rate constants. In the adjunctive pathway, the reaction rate was found to be affected by the concentrations of divalent cations and citrate. The kinetic data in the adjunctive pathway was well explained by involving the effect of direct association of divalent cation to the precursor complex. The results indicated the significant effect of divalent cations on the kinetics for the ligandexchange of iron-citrate complex with DFB.

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  • Kinetics of Formation and Dissociation of Organically Complexed Iron in Coastal Waters: Relationship between Characteristics of Organic Ligand and Rate Constant Reviewed

    FUJII Manabu, Andrew L. ROSE, T. David WAITE, OMURA Tatsuo

    Japan journal of water pollution research   Vol. 30 ( No. 5 )   267 - 275   2007

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    The kinetics of the formation and dissociation of the Fe(III)-NOM (natural organic matter) complex in coastal waters was investigated using the competitive ligand method. The rate constants for the formation and dissociation of the Fe(III)-NOM complex were determined by fitting a model to observed data. The iron-binding capacity of NOM, which is required for the determination of the rate constants, was initially measured by the ion exchange method. The rate constants of the formation of the Fe(III)-NOM complex ranged from 2.6×106 to 7.3×106 M-1·s-1. A discrete ligand model for the dissociation kinetics of the Fe(III)-NOM complex yielded rate constants from 6.9×10-4 to 2.0×10-3 s-1 for weak-binding ligands and from 1.6×10-5 to 8.3×10-5 s-1 for strong-binding ligands, respectively. The kinetics of the Fe(III)-NOM complex in coastal water was then predicted using the estimated rate constants. The model prediction showed that the dissociation of the complexes is relatively slow with a half-life longer than 120 hr. The adsorption peak ratios of oxygen-containing functional groups of NOM calculated from FTIR spectra showed good correlation with both the iron-binding capacity and the rate constants, implying that the ratio is a useful factor for assessing the kinetics of organically complexed iron in coastal water.

    DOI： 10.2965/jswe.30.267

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    Other Link： http://hdl.handle.net/10097/52967

  • Superoxide-mediated dissolution of amorphous ferric oxyhydroxide in seawater Reviewed

    Manabu Fujii, Andrew L Rose, T D Waite, Tatsuo Omura

    Environmental science & technology   Volume 40 ( Issue 3 )   880 - 887   2006.2

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    DOI： 10.1021/es051622t

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  • 松島湾における溶存態有機物質(DOM)と鉄濃度の空間的分布と季節変化 Reviewed

    藤井学, 大友俊, 佐々木陽, 渡部徹, 大村達夫

    水環境学会誌   40 ( 3 )   880 - 887   2006

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  • Spatial and Seasonal Distributions of Dissolved Organic Matter and Iron in Matsushima Bay, Japan Reviewed

    FUJII Manabu, SASAKI Akira, OTOMO Shun, WATANABE Toru, OMURA Tatsuo

    Japan journal of water pollution research   Vol. 29 ( No. 3 )   169 - 176   2005

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    In this study, we investigated the spatial and seasonal distributions of dissolved organic matter (DOM) and iron in Matsushima Bay, Japan from November 2003 to October 2004. The chemical characteristics of DOM, such as concentrations of dissolved organic carbon (DOC) and XAD resin absorbed organic carbon (XOC), UV absorbance, molecular weight and carbon stable isotope ratio, were also studied in the bay and the Takagi River. In the bay, DOC concentration increased particularly in summer. The XOC concentration and molecular weight of DOM decreased along the river to the bay. The carbon isotope ratio of DOM indicated that a significant amount of humic substance was produced in the bay. Dissolved iron concentration rapidly decreased with the increase in salinity from the river to the bay and was extremely low in seawater of high salinity. It was considered that this decrease in dissolved iron concentration was attributable to the precipitation of dissociated iron from organic compounds caused by the increase in the concentration of metal cations as river water meets seawater.

    DOI： 10.2965/jswe.29.169

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    Other Link： http://hdl.handle.net/10097/52984

  • Equilibrium Model for Humic Iron Complex in Estuary Reviewed

    FUJII Manabu, OMURA Tatsuo

    Doboku Gakkai Ronbunshuu G   Vol. 42 ( No. )   145 - 155   2005

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    Iron complexed by humic substance (HS) is one of the most essential metals for the growth of aquatic organisms in estuary. In this study, we investigated the equilibrium behavior of humic iron complex with mathematical model. The equilibrium model was developed on the basis of Debye-Huckel theory, which can take account of the potential energy of iron around the surface of HS. The dissociation of iron from HS in estuarine water was described as results of the competition with divalent cations (Mg2+, Ca2+) and the decrease of surface potential of HS with increase of ionic strength. In this model, adsorption sites on HS were divided into two classes depending on the affinity with iron. This classification resulted in the good agreement with the experimental data in artificial estuarine water. Furthermore, the experimental data in NaCl solution was also well explained by using the calculated intrinsic equilibrium constant. The calculated equilibrium constant between adsorption sites and iron exhibited similar value with reported equilibrium constants. In conclusions, developed model could theoretically describe the equilibrium behavior of humic iron complex with the variation of salinity in estuary.

    DOI： 10.11532/proes1992.42.145

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  • 河口・沿岸域条件下におけるフミン物質の凝集モデルの構築 Reviewed

    藤井学, 渡部徹, 大村達夫

    環境工学研究論文集   Vol. 41 ( No. )   377 - 387   2004

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    Humic substances (HS) derived from terristrial area play important roles to supply essential minerals for the growth of aquatic organisms in estuaries. Therefore, the watershed management focusing on the transportation of essential minerals from terrestrial area to estuaries is needed for the conservation of estuarine ecosystem. Although it is said that a part of HS coagulates in estuaries with the increase of salinity, its mechanism has not been well-known. In this study, the coagulation model for humic substances in estuaries was developed on the basis of DLVO theory and hydrophobolic interaction which caused a strong attractive force between HS. This attractive force was estimated with hydrophobic index (E254/TOC) of HS and its molecular weight detected by gel chromatography analysis with 254nm spectrophotometer. The developed model could explainthe coagulation mechanism of humic acid according to the decrease of surface potential in estuarine condition. The result of simulation using this model showed that humic acid with intermediate molecular weight around 20k Da easily coagulated at the high salt concentration in estuaries.

    DOI： 10.11532/proes1992.41.377

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  • 河口・沿岸域におけるフミン鉄の錯平衡と凝集特性 Reviewed

    藤井学, 渡部徹, 大村達夫

    環境工学研究論文集   Vol. 41 ( No. )   389 - 400   2004

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    Humic iron complex is one of the most essential minerals for the growth of aquatic organisms in estuaries. However, the behavior of humic iron complex has not been known so well in estuaries where salinity widely changes. In this study, the effect of salinity on the behavior of humic iron complex was investigated with the Dando humic and fulvic acids. The increase of salinity, especially divalent cations such as magnesium and calcium ions, enhanced the coagulation of humic substances (HS). When the salt concentration increased from 0 to 30g/L, 81% of dissolved humic acid (HA) and 18% of dissolvedfulvic acid (FA) transformed to the particulate (>0.45μm) due to the coagulation. Gel chromatography analysis with UV spectrometer (254nm) revealed that high molecular weight and hydrophobic fractions of humic substances were important factors relevant to the coagulation. The increase of salinity also enhanced the dissociation of iron from HA and FA. With the increase of salt concentration from 0 to 30g/L, 98% and 88% of iron dissociated from HA and FA, respectively. It was expected that amino and sulfo groups on the surface of HA and FA which possess a high affinity with iron contributed to the subsistence of dissolved iron in estuaries.

    DOI： 10.11532/proes1992.41.389

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  • Dissolved Organic Matter (DOM) Formation from Particulate Organic Matter (POM) in Upstreams Reviewed

    FUJII Manabu, YOSHIMURA Chihiro, TOCKNER Klement, OMURA Tatsuo

    Doboku Gakkai Ronbunshuu G   Vol. 40 ( No. )   139 - 149   2003

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    Experiments on the leaching of DOM from riverine POM fractions were conducted to investigate the qualitative and quantitative formation of dissolved organic matter (DOM). Amphipods (Gammarus sp.) were fed in the laboratory with preconditioned leaves of Fraxinus excelsior, Alnusincana, and Querrus robur, twigs of Populus nigra, and epilithic algae (periphyton). Amphipods produced two FPOM fractions (L-FPOM: 250-500μm; M-FPOM; 100-250μm). L-FPOM consisted primarily of fecal pellets while M-FPOM was mainly composed of CPOM fragments created by the feeding activity. FPOM fractions and CPOM were exposed in 100ml Erlenmeyer bottles and stirred at 100rpm at 12°C under dark conditions. DOC release rate, UV absorption (E285) and microbial respiration (Biological Oxygen Demand in 3 days) were repeatedly measured over a 14-day period.<BR>FPOM exhibited significantly lower DOC release rate than CPOM in first 24 hours of the experiment while it was slightly higherthan CPOM in the second week. DOM release rate from air-dried leaves (CPOM) was significantly correlated with chlorophyll acontent. Microbial respiration suggested that POM was converted by bacterial community into more refractory compound whilereleasing relatively labile DOM. In addition, POM derived from epilithic algae showed distinct leaching mechanism from allochthonous POM.

    DOI： 10.11532/proes1992.40.139

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MISC

  • Augmentation and evaluation of solar still performance: A comprehensive review Reviewed

    Ammar Elsheikh, Karrar A. Hammoodi, Ahmed Mohamed Mahmoud Ibrahim, Abdel Hamid I. Mourad, Manabu Fujii, Walaa Abd-Elaziem

    Desalination   574   117239 - 117239   2024.4

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  • アミン修飾活性炭を用いたPFASの吸着と化学的再生に関する研究

    山本光一, 加藤大道, ZHANG Bei, 磯部敏宏, 藤井学

    環境工学研究フォーラム講演集(CD-ROM)   61st   2024

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  • 異なる濃度のメタノールを用いた段階的溶出がFT-ICR MSによる自然有機物の分子組成同定に及ぼす影響

    藤巻花野子, LIU Jibao, FU Qing Long, KWON Eunsang, 藤井学

    環境工学研究フォーラム講演集(CD-ROM)   61st   2024

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  • Synthesis of activated carbon by glucose hydrothermal method and its PFAS adsorption properties

    守山太貴, ZHANG Bei, 藤井学, 望月泰英, 有光直樹, 中島章, 磯部敏宏

    日本セラミックス協会秋季シンポジウム講演予稿集(Web)   37th   2024

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  • PREDICTIVE MODEL OF DISINFECTION BYPRODUCTS FROM NATURAL ORGANIC MATTERS USING HIGH-RESOLUTION MASS SPECTROMETRY AND MACHINE LEARNING

    吉田謙司, Liu Jibao, KWON Eunsang, 藤井学

    土木学会論文集(Web)   80 ( 25 )   2024

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  • Non-targeted analysis for PFAS using FT-ICR MS

    藤井学, LIU Jibao, 磯部敏宏, QING Shanshan, 竹内希, ZHANG Bei, KWON Eunsang

    日本水環境学会シンポジウム講演集   27th   2024

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  • Characterization of halogenated organic compounds by the Fourier transform ion cyclotron resonance mass spectrometry: A critical review International journal

    Shixi Wu, Manabu Fujii, Xin Yang, Qing Long Fu

    Water Research   246   120694 - 120694   2023.11

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  • ADSORPTION REMOVAL OF PERFLUOROOCTANOIC ACID BY AMINE MODIFIED CARBON MATERIAL

    加藤大道, ZHANG Bei, 藤井学, 磯部敏宏

    土木学会論文集(Web)   79 ( 25 )   2023

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  • 高分解能質量分析による高度処理での塩素消毒副生成物形成に関する研究

    吉田謙司, LIU Jibao, ELSAMADONY Mohamed, FU Quing Long, 權垠相, 藤井学

    環境工学研究フォーラム講演集(CD-ROM)   60th   2023

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  • Characterization of Dissolved Organic Matter in River Basins and Coastal Areas Using Ultra-High-Resolution Mass Spectrometry

    藤巻花野子, 和田光央, FU Qing Long, KWON Eunsang, 藤井学

    土木学会論文集(Web)   79 ( 25 )   2023

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  • ESTIMATING FORMATION MECHANISM OF DISINFECTION BY-PRODUCTS AND MOLECULAR COMPOSITIONS OF THEIR PRECURSOR NOM USING ULTRA-HIGH RESOLUTION MASS SPECTROMETRY

    渡辺あかり, DWINANDHA Dhimas, FU Qing Long, 藤井学

    土木学会論文集 G(環境)(Web)   78 ( 7 )   2022

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  • Assessing the interrelationships among SDG 6-related indicators using explainable machine learning

    田辺洋輝, ELSAMADONY Mohamed, DWINANDHA Dhimas, 藤井学

    土木学会論文集 G(環境)(Web)   78 ( 7 )   2022

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  • Perspectives on Potential Applications of Nanometal Derivatives in Gaseous Bioenergy Pathways: Mechanisms, Life Cycle, and Toxicity

    Mohamed Elsamadony, Ahmed Elreedy, Alsayed Mostafa, Manabu Fujii, Johannes Gescher, Sepehr Shakeri Yekta, Anna Schnürer, Jean François Gaillard, Deepak Pant

    ACS Sustainable Chemistry and Engineering   9 ( 29 )   9563 - 9589   2021.7

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    DOI： 10.1021/acssuschemeng.1c02260

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  • Proposal of a Corrosion Prediction Method for Reflecting Measured Environmental Conditions in Sanitary Sewerage Pipes

    今井隆太, 千々和伸浩, 藤井学

    コンクリート構造物の補修,補強,アップグレード論文報告集(CD-ROM)   21   2021

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  • 沿岸域における鉄と有機物の動態に関する研究

    藤井学, 吉村千洋

    日本水環境学会シンポジウム講演集   22nd   2019

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  • Dissolved nitrogen release from coarse and amphipod-produced fine particulate organic matter in freshwater column (vol 17, pg 33, 2016)

    Quynh Nga Le, Manabu Fujii, Chihiro Yoshimura, Klement Tockner

    LIMNOLOGY   17 ( 2 )   199 - 200   2016.4

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  • Relationship between dissolved trace metals and optical properties of dissolved organic matters in freshwaters

    ( 58 )   80 - 89   2016

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  • GEOTRACES計画エンジン全開ヘ-躍進する微量元素海洋学-淡水中における溶存態微量金属と溶存有機物の光学特性との関係

    菊地哲郎, 菊地哲郎, 藤井学, 吉村千洋

    月刊海洋   2016

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  • 自然水中における鉄の化学種と生物利用性-鉄と有機物の動態からみる森・川・海のつながり-

    夏池真史, 菊地哲郎, 菊地哲郎, LEE Ying Ping, 伊藤紘晃, 伊藤紘晃, 藤井学, 吉村千洋, 渡部徹

    水環境学会誌(Web)   39 ( 6 )   2016

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  • Effect of concentration and size of suspended sediment on nitrogen dynamics in freshwater ecosystem

    Quynh Nga Le, Chihiro Yoshimura, Manabu Fujii

    ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY   246   2013.9

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  • フルボ酸鉄錯体とdesferrioxamine Bのリガンド交換反応に及ぼすpHとイオン強度の影響

    伊藤紘晃, 藤井学, 真砂佳史, 大村達夫

    日本水環境学会年会講演集   46th   324   2012.3

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  • フルボ酸第二鉄錯体とシデロフォアdesferrioxamine Bのリガンド交換反応に及ぼすpHとイオン強度の影響

    伊藤紘晃, 藤井学, 真砂佳史, 渡部徹, 大村達夫

    環境工学研究論文集   49   2012

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  • 淡水性藍藻類Microcystis aeruginosa毒素生産株と非生産株の鉄摂取機構

    藤井学, WAITE T.David

    日本水環境学会年会講演集   46th   2012

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  • クエン酸第二鉄錯体とシデロフォアdesferrioxamine Bのリガンド交換反応に及ぼすイオン強度とpHの影響

    伊藤紘晃, 藤井学, 真砂佳史, 大村達夫

    環境工学研究論文集   48   III.541-III.552   2011.11

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  • Effect of light on Fe uptake by freshwater cynobacterium Microcystis aeruginosa

    Fujii Manabu, Omura Tatsuo, Waite David T.

    Annual report of the Society for the Promotion of Construction Engineering   46   27 - 31   2011.4

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  • Effect of ionic strength and pH on ligand exchange reaction between ferric citrate complex and siderophore desferrioxamine B

    Hiroaki Ito, Manabu Fujii, Yoshifumi Masago, Tatsuo Omura

    Journal of Japan Society of Civil Engineers, Ser. G   67   III_541-III_552   2011

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  • 淡水性藍藻類Microcystis aeruginosaの細胞活性に及ぼすレクチンの影響

    真砂佳史, 佐々木史織, 藤井学, 伊藤紘晃, 大村達夫

    環境工学研究フォーラム講演集   47th   43 - 45   2010.11

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  • 単量体アルミニウムと懸濁粒子及び藻類由来有機物の反応速度定数の算出

    八巻哲也, 伊藤紘晃, 藤井学, 真砂佳史, 大村達夫

    土木学会年次学術講演会講演概要集(CD-ROM)   65th   ROMBUNNO.VII-035   2010.8

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  • Effect of Divalent Cations on Ligand-Exchange Kinetics of Fe (III) -Fulvic Acid Complex and Siderophore Desferrioxamine B

    伊藤紘晃, 藤井学, 真砂佳史, 大村達夫

    水環境学会誌(Web)   33 ( 9 )   2010

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  • Kinetics of aluminum complexation by algal organic matters

    Tetsuya Yamaki, Hiroaki Ito, manabu Fujii, Yoshifumi Masago, Tatsuo Omura

    Environmental Engineering Research   47   109 - 118   2010

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  • レクチンがMicrocystis aeruginosaの生理活性に与える影響

    佐々木史織, 伊藤紘晃, 熊谷幸博, 藤井学, 真砂佳史, 大村達夫

    日本陸水学会大会講演要旨集   74th   204 - 181   2009.9

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  • pH6.0‐9.0における有機第二鉄錯体とシデロフォアDesferrioxamine Bのリガンド交換速度論

    伊藤紘晃, 藤井学, 真砂佳史, 大村達夫

    日本陸水学会大会講演要旨集   74th   158 - 135   2009.9

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  • Microcystis aeruginosa由来細胞表面多糖の分析

    佐藤有一, 今江泰貴, 真砂佳史, 藤井学, 大村達夫

    日本陸水学会大会講演要旨集   74th   205 - 182   2009.9

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  • Superoxide-mediated transformations of iron by cyanobacterial prokaryotes

    T D Waite, Aurelie Godrant, Manabu Fujii, Andrew L Rose

    Geochimica et Cosmochimica Acta Supplement   Volume 73 ( 13 )   A1400 - A1400   2009.6

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  • 沿岸域植物プランクトンによるシデロフォアを介した鉄利用性の評価

    伊藤紘晃, 藤井学, 大村達夫

    土木学会年次学術講演会講演概要集(CD-ROM)   63rd ( Disk 2 )   2008

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  • Superoxide-mediated reduction of ferric iron in natural aquatic systems

    TD Waite, AL Rose, S Garg, M Fujii

    Geochimica Et Cosmochimica Acta   Volume 18 ( Issue 70 )   A681 - A681   2006.6

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  • DOM formation from POM in streams

    M Fujii, C Yoshimura, K Tockner, T Omura

    Geochimica et Cosmochimica Acta Supplement   Vol. 67 ( Issue 18 )   A107 - A107   2003.9

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Presentations

  • 安定同位体比を用いた沿岸域におけるフミン物質の起源推定

    第60回土木学会年次学術講演会  2005 

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  • 沿岸域でのスーパーオキシドによる有機鉄の還元挙動

    第60回土木学会年次学術講演会  2005 

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  • 河口・沿岸域におけるフミン鉄の錯平衡モデル

    第42回環境工学研究フォーラム  2005 

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  • Characterization of humic substances in coastal area originated from catchment

    Lyngbya Workshop  2005 

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  • 数値解析による河口・沿岸域におけるフミン鉄の供給範囲の把握

    平成16年度土木学会東北支部技術研究発表会  2005 

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  • Superoxide-mediated reduction of ferric iron in natural aquatic systems

    16th V. M. Goldschmidt Conference  2006 

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  • 河口・沿岸域に流入するフミン物質の起源及び鉄吸着特性

    平成16年度土木学会東北支部技術研究発表会  2005 

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  • 沿岸域での有機鉄錯体の解離機構において二価金属イオンの及ぼす影響解明

    第62回土木学会年次学術講演会  2007 

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  • 二価金属存在下におけるクエン酸第二鉄錯体とDesferrioxamine Bのリガンド交換動力学

    第44回環境工学研究フォーラム  2007 

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  • 沿岸域における鉄の挙動解明を目的とした溶存有機鉄と水酸化鉄の分離手法の確立

    第40回水環境学会年会  2006 

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  • 沿岸域でのスーパーオキシドによる有機鉄の還元メカニズム

    第40回水環境学会年会  2006 

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  • Iron acquisition of Microcystis aeruginosa : Importance of iron accumulation and reduction step

    12th Biennial Symposium on Microbial Ecology (ISME-12)  2008 

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  • 有機鉄の錯形成速度に及ぼすカルシウムイオンの影響

    第41回水環境学会年会  2007 

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  • 競合リガンド法を用いた沿岸域における有機鉄錯体の解離速度の測定

    平成18年度東北支部技術研究発表会  2007 

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  • 沿岸域における生物利用可能な鉄の生成機構解明－有機リガンド濃度による影響－

    平成18年度東北支部技術研究発表会  2007 

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  • フルボ酸鉄錯体とDesferrioxamine Bのリガンド交換反応に二価金属イオンが与える影響の解明

    平成19年度東北支部技術研究発表会  2008 

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  • Microcystis aeruginosa の増殖と鉄摂取に与える細胞外スーパーオキシドの影響

    第45回環境工学研究フォーラム  2008 

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  • Generation of the superoxide radical anion at biological interfaces and impact on iron acquisition by aquatic organisms

    5th International Conference Interfaces Against Pollution  2008 

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  • Superoxide-mediated transformations of iron by cyanobacterial prokaryotes

    19th V. M. Goldschmidt Conference  2009 

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  • スーパーオキシドの生成と鉄の化学的形態がMicrocystis aeruginosaの増殖速度に与える影響

    第42回水環境学会年会  2008 

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  • スーパーオキシドがMicrocystis aeruginosaの鉄摂取に与える影響

    平成19年度東北支部技術研究発表会  2008 

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  • DLVO理論に基づく河口域でのフミン物質凝集モデル

    第59回土木学会年次学術講演会  2004 

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  • 河川上流域における粒状態有機物(POM)から溶存態有機物(DOM)への変換過程に関する研究

    第40回環境工学研究フォーラム  2003 

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  • DOM formation from POM in streams

    13th V. M. Goldschmidt Conference  2003 

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  • 河口域におけるフミン酸鉄の挙動解析

    平成13年度土木学会東北支部技術研究発表会  2002 

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  • 河口域での潮汐を考慮したフミン酸鉄の挙動解析

    第57回土木学会年次学術講演会  2002 

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  • 河口・沿岸域条件下におけるフミン物質の凝集モデルの構築

    第41回環境工学研究フォーラム  2004 

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  • 河口・沿岸域におけるフミン鉄の錯平衡と凝集特性

    第41回環境工学研究フォーラム  2004 

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  • 河口域におけるフミン物質と鉄の錯平衡モデルの構築

    第59回土木学会年次学術講演会  2004 

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  • 河川における微細粒状態有機物の生成と生物分解性

    第38回水環境学会年会  2004 

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  • 河口域におけるフミン物質の凝集沈降モデルの構築

    平成15年度土木学会東北支部技術研究発表会  2004 

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  • 河口域条件下におけるフミン物質と鉄の錯平衡実験

    平成15年度土木学会東北支部技術研究発表会  2004 

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Awards

  • 水環境学会論文奨励賞（廣瀬賞）

    2018   水環境学会  

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  • 平成26年度 東京工業大学工学系教育賞

    2015   東京工業大学   水理学実験において新規実験項目の導入に貢献した

    藤井 学

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  • 平成26年度 東京工業大学工系若手奨励賞

    2014   東京工業大学   南三陸町志津川湾における鉄の化学動態と生物利用性の解明

    藤井 学

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  • utstanding Presentation Award, 246th American Chemical Society National Meeting & Exposition 2013

    2013   American Chemical Society   Effect of Concentration and Size of Inorganic Suspended Sediment on Microbial-Mediated Nitrogen Transformation in Freshwater

    藤井 学

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  • WET Excellent Research Award, Water and Environment Technology Conference 2013

    2013   Japan Society on Water Environment【(社)日本水環境学会】   Effect of concentration and size of inorganic suspended sediment on nitrogen dynamics in freshwaterｓ

    藤井 学

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  • 第48回 環境工学研究フォーラム論文賞

    2012   社）土木学会環境工学委員会   クエン酸第二鉄錯体とシデロフォアdesferrioxamine B のリガンド交換反応に及ぼすイオン強度とpH の影響

    藤井 学

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  • 平成23年度 科学技術分野の文部科学大臣表彰科学若手者賞

    2011   文部科学省   自然水中における鉄の化学反応速度論の研究

    藤井 学

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  • 第46回 環境工学研究フォーラム論文奨励賞

    2010   （社）土木学会環境工学委員会   沿岸域において鉄の酸化還元反応に及ぼす自然有機物質の影響

    藤井 学

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  • 平成21年度 土木学会論文奨励賞

    2010   （社）土木学会   沿岸域において鉄の酸化還元反応に及ぼす自然有機物質の影響

    藤井 学

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  • 第60回土木学会年次学術講演会優秀公演者賞

    2005  

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    Country：Japan

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  • 第40回環境工学研究フォーラム論文賞

    2003   （社）土木学会環境工学委員会   河川上流域における粒状態有機物(POM)から溶存態有機物(DOM)への変換過程に関する研究

    藤井 学

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    Country：Japan

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  • 第47回 環境工学研究フォーラム優秀ポスター発表賞

    （社）土木学会環境工学委員会   淡水性藍藻類Microcystis aeruginosa の細胞活性に及ぼすレクチンの影響

    藤井 学

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  • 平成21年度 建設工学研究奨励賞

    （財）建設工学研究振興会   淡水性藍藻類の鉄摂取と毒素生産機構の解明

    藤井 学

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Research Projects

  • 未知PFASの出現にロバストな検出・除去技術の統合的開発プラットフォーム

    Grant number：25K21821  2025.6 - 2028.3

    日本学術振興会  科学研究費助成事業  挑戦的研究(開拓)

    藤井 学

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    Grant amount：\25870000 （ Direct Cost: \19900000 、 Indirect Cost：\5970000 ）

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  • 超高分解能質量分析と同位体標識法を融合した天然有機物の分子変換プロセス解明

    Grant number：25K01355  2025.4 - 2028.3

    日本学術振興会  科学研究費助成事業  基盤研究(B)

    藤井 学, 權 垠相, 劉 吉寶

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    Grant amount：\18850000 （ Direct Cost: \14500000 、 Indirect Cost：\4350000 ）

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  • 超高分解能質量分析を用いた環境水中での未知PFASの検出網羅性向上と変換プロセス解明

    Grant number：25K15476  2025.4 - 2028.3

    日本学術振興会  科学研究費助成事業  基盤研究(C)

    劉 吉寶, 權 垠相, 藤井 学

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    Grant amount：\4680000 （ Direct Cost: \3600000 、 Indirect Cost：\1080000 ）

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  • 二原子光触媒を駆使した可視光下でのペルオキシ一硫酸活性化によるPFAS除去技術

    Grant number：24KF0109  2024.7 - 2027.3

    日本学術振興会  科学研究費助成事業  特別研究員奨励費

    藤井 学, YANG YANG

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    Grant amount：\2300000 （ Direct Cost: \2300000 ）

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  • Chemometric investigation on photogeneration of free radicals by dissolved organic matter and their effects on water quality

    Grant number：24K01010  2024.4 - 2027.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (B)

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    Grant amount：\18590000 （ Direct Cost: \14300000 、 Indirect Cost：\4290000 ）

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  • ケモインフォマティクスによる溶存有機物の変換生成物同定と分子構造解析

    Grant number：23K22893  2024.4 - 2025.3

    日本学術振興会  科学研究費助成事業  基盤研究(B)

    藤井 学, 權 垠相

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    Grant amount：\5070000 （ Direct Cost: \3900000 、 Indirect Cost：\1170000 ）

    研究初年度では、超高分解能質量分析の解析におけるアルゴリズムの高度化や野外調査による水試料の採取に焦点を当てて研究に取り組んだ。具体的には、質量データから分子組成を決定するプロセスにおいて、質量データのキャリブレーションや同位体ピークを考慮することによる分子組成同定精度の検証に取り組んだ。さらに、試料中に潜在的に存在する質量差（光分解反応などの過去の反応により生じた質量差を示し、以降PMDと呼ぶ）に着目したPMDネットワーク解析に着手した。PMDネットワーク解析では、ノードを分子組成式、エッジをPMDとし、特定の反応により生じる反応物と生成物間の質量差（例えば、光化学反応による水酸化や脱アルキル化など）を算出するが、そのプログラムコードの開発に着手した。開発されたコードを用いて、今後は試料中に内在する反応に着目して溶存有機物変換生成物の検出が可能か検討を行う。また、解析対象試料の採取のため野外調査を関東近郊の河川において実施した。排水などの人為的な影響の程度を考慮して、上流から下流までの複数地点において野外調査を実施した。採取した水試料は、メンブレンフィルターによるろ過後、固相抽出法により有機物の精製と抽出を行った。また、基本水質情報として、ｐHや溶存酸素濃度、電気伝導度、全有機炭素などの複数の水質項目の測定を行った。抽出された有機物質は５０％メタノール保管し、フーリエ変換イオンサイクロトロン共鳴質量分析計（FT-ICR MS）による測定を実施した。得られた質量データについては、今後上述の解析アルゴリズムにより解析を進める予定である。

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  • 沿岸海域における溶存有機物の分子構造と環境機能

    2024 - 2027

    科学技術振興機構  戦略的な研究開発の推進 戦略的創造研究推進事業 さきがけ 

    藤井 学

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    Authorship：Principal investigator 

    超高分解能質量分析(FT-ICR-MS)やケモインフォマティクス技術、ネットワーク解析等を活用して、DOM分子構造の探索かつ網羅的スクリーニングが可能なネットワークトラバーサル法を開発します。タンデム質量分析やLC分析による構造候補の検証、さらには分子変換過程の解明、分子構造情報からの環境機能推定等を通して、炭素循環を含む様々な角度から沿岸海域DOMの環境機能や生物地球化学的プロセスを評価します。

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    J-GLOBAL

  • 超高分解能質量分析を駆使した変換生成物汚染実態解明とそれに基づく水質管理法の開発

    Grant number：23KK0074  2023.9 - 2027.3

    日本学術振興会  科学研究費助成事業  国際共同研究加速基金(海外連携研究)

    藤井 学, 權 垠相, ザン ベイ

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    Grant amount：\21060000 （ Direct Cost: \16200000 、 Indirect Cost：\4860000 ）

    研究初年度は、新興有機汚染物質の室内実験（水処理試験）の実施に加えて、固相抽出などを用いた生成変換物の抽出・精製処理を行った。室内試験では、UVやプラズマなどを用いた複数の高度処理処理システムの準備に取り掛かり、UVや塩素などを用いた一部の高度処理試験について新興汚染物質の分解試験を行った。汚染物質としては、複数種の医薬品やペルフルオロアルキル化合物およびポリフルオロアルキル化合物（PFAS）や塩素副生成物などの新興汚染物を対象とした。種々の固相抽出カラム（WAXカラム、HLBカラム、PPLカラム等）とメタノール溶媒を用いて分解生成物の溶出・精製を行い、質量分析の測定試料として準備した。また、実験作業と並行して、質量分析データから変換生成物をスクリーニングするためのアルゴリズムの作成に着手した。本手法は、これまでに構築してきた分子組成同定アルゴリズム（TRFuアルゴリズム）をベースとして、得られた高分解能質量分析データより分子組成を同定し、その後、サスペクトスクリーニングや分子ネットワーク手法等を組み合わせることで、変換生成物候補を検出するノンターゲット手法である。研究初年度では、分子組成同定アルゴリズムにハロゲン等の元素を組み込むことを中心に作業を行った。従来ではCHONSPを主とした化合物が解析対象となっていたが、ハロゲン元素を組み込むことにより、Fなどの新興汚染物質に含まれる元素も対象にした分子組成同定アルゴリズムとして更新した。

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  • 超高分解能質量分析を駆使した変換生成物汚染実態解明とそれに基づく水質管理法の開発

    Grant number：23823053  2023.4 - 2027.3

    日本学術振興会  科学研究費助成事業  国際共同研究加速基金（国際共同研究強化（Ｂ））

    藤井 学, 權 垠相, 磯部 敏宏, 望月 泰英

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  • 多機能性複合材を活用した畜産系廃棄物の高度嫌気性消化技術開発

    Grant number：22KF0140  2023.3 - 2025.3

    日本学術振興会  科学研究費助成事業  特別研究員奨励費

    藤井 学, 藤井 学, ALI MANAL, ALI MANAL

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    Grant amount：\2300000 （ Direct Cost: \2300000 ）

    家畜糞尿などの有機性廃棄物の嫌気性消化において、バイオガスの生産（水素やメタンガスの生成を促進するとともに基質の分解や新興汚染物質の除去などを向上させることは技術上重要な課題である。本研究では、嫌気性消化においてバイオ炭や活性炭、グラフェンを含むカーボン材料を活用することで、上述の処理向上・効率化を図る。研究初年度では、特に粉末活性炭、多層カーボンナノチューブ、グラフェンに着目し、バイオガス生成やその基礎となる嫌気性微生物群に及ぼす影響について調べた。電子顕微鏡やフーリエ変換赤外分光法によりカーボン材料の物性分析も併せて実施した。結果の一例を示すと、グラフェン30mg/Lや粉末活性炭100mg /Lの添加系において、メタン生成量がそれぞれ約28％および約27％の改善を示した。上述のカーボン材料が特に高い濃度の場合は生成量が下がったことから、カーボン材料が有する導電性により微生物間の電子伝達が促進される一方で、カーボン材料が潜在的に有する毒性の影響も示唆された。さらに、嫌気性消化プロセスに関わる微生物叢解析では、共起ネットワーク解析を実施し、バイオガスの生産性向上に寄与すると考えられる微生物叢の抽出を行った。以上のカーボン材料に加え、畜産系廃棄物由来のバイオ炭をニッケルフェライト粒子で修飾した新たな機能複合材の開発準備にも着手した。上記の合成プロセスでは、水熱温度や粒子添加量などの反応条件を制御することで、導電率、表面積など物性の異なるバイオ炭の精製を試みる。

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  • 廃棄汚泥由来バイオ炭の多機能性を活用した高度嫌気性消化技術の開発

    Grant number：22KF0134  2023.3 - 2024.3

    日本学術振興会  科学研究費助成事業  特別研究員奨励費

    藤井 学, 藤井 学, LIU JIBAO, LIU JIBAO

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    Grant amount：\2800000 （ Direct Cost: \2800000 ）

    嫌気性消化処理は、有機性廃棄物をエネルギー（メタンガス）等に変換することが可能であり、持続可能な社会へ向けて重要な技術となる。本研究では、従来の嫌気性消化処理にバイオ炭添加や促進酸化処理技術を組み合わせることで、廃棄汚泥からのバイオガス生産効率向上や新興汚染物質の除去などを可能とする高度嫌気性消化技術を開発する。研究初年度では、原料として廃棄活性汚泥を活用し、熱分解ならびに鉄の添加処理により鉄含有バイオ炭の合成を行った。鉄含有バイオ炭存在下での過硫酸塩による酸化処理では、活性汚泥フロックを効率的に破砕することができ、バイオガス生成における中間物質（酢酸などの揮発性脂肪酸）の生産量を向上させることができた。例えば、鉄含有バイオ炭存在下では、揮発性脂肪酸の生成量が1.5倍増加することが確認できた。しかし、過硫酸塩による酸化処理で残留した過硫酸塩が、後段の微生物処理における阻害機能を示し、残留性過硫酸塩の除去や逓減が今後に検討すべき重要な課題となった。また、使用した、鉄含有バイオ炭の物性分析（表面特性や細孔分析等）も電子顕微鏡法や窒素吸着法により実施した。さらに、嫌気性消化に関わる微生物の菌叢解析において重要となるネットワーク解析を実施した。ネットワーク解析は、微生物間相互作用やキーストーン種を検出するために有用と考えられるが、既存の相関関係ベースのネットワーク解析では、微生物間相互作用の非線形性を十分に考慮できていない懸念があった。そこで本研究では、PCA-PMIなど非線形的な共起関係に基づきネットワーク解析を実施可能なワークフローを構築した。その結果、これまでの線形解析では検出できなかった、嫌気性消化に重要なメタン菌などを重要種として検出することに成功した。

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  • 機能性ナノ材料を活用したハイブリッド太陽熱蒸留による海水淡水化技術の開発

    Grant number：22KF0139  2023.3 - 2024.3

    日本学術振興会  科学研究費助成事業  特別研究員奨励費

    藤井 学, 藤井 学, ELSHEIKH AMMAR, ELSHEIKH AMMAR

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    Grant amount：\3000000 （ Direct Cost: \3000000 ）

    本研究では、再生可能エネルギーである太陽熱を利用して海水淡水化可能な太陽熱蒸留技術の開発に取り組む。特に、集光性や伝熱性の高い新機能性材料を開発・活用することで、蒸留プロセスの高度化と淡水化収量の増加を図るとともに、淡水化収量の高い蒸留装置デザイン設計を行う。研究初年度は、太陽エネルギーを効率よく吸収する新規材料として、可視光や近赤外光の吸収特性が高いナノ粒子や複合体を複数の方法で合成した。具体的には、キトサンや酸化グラフェン、ニッケルなどを原材料としナノ粒子ならびに複合体を調子した。キトサンナノ粒子の合成では、酢酸やトリポリリン酸ナトリウムなどを用い、酸化ニッケルナノ粒子は塩化ニッケル六水和物や水酸化ニッケルなどから合成された。また、ナノ粒子の複合材の合成も行い、合成されたナノ粒子を適量水に添加し（例えば、0.1%など）、ナノ流体を作成した。合成されたナノ材料は、フーリエ変換赤外分光法（FT-IR）分析、X線回折法（XRD）分析、走査電子顕微鏡（SEM）分析ならびにエネルギー分散型X線分光法（EDX）分析などにより物性分析された。特に、キトサン-酸化グラフェン複合体は、他のナノ粒子と比較して高い吸光性を示すことが明らかとなった。従って、太陽熱蒸留の新機能性材料として有効であることが示唆された。一方、効率的な太陽熱蒸留装置の設計という観点から、複数の装置デザイン設計を行い、また、予備的な熱・物質移動シミュレーションを実施することで、階段型蒸留装置などがより効率的な太陽光吸収・淡水化収量を可能とするということが示唆された。

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  • ケモインフォマティクスによる溶存有機物の変換生成物同定と分子構造解析

    Grant number：22H01623  2022.4 - 2025.3

    日本学術振興会  科学研究費助成事業  基盤研究(B)

    藤井 学, 權 垠相

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    Grant amount：\17420000 （ Direct Cost: \13400000 、 Indirect Cost：\4020000 ）

    研究初年度では、超高分解能質量分析の解析におけるアルゴリズムの高度化や野外調査による水試料の採取に焦点を当てて研究に取り組んだ。具体的には、質量データから分子組成を決定するプロセスにおいて、質量データのキャリブレーションや同位体ピークを考慮することによる分子組成同定精度の検証に取り組んだ。さらに、試料中に潜在的に存在する質量差（光分解反応などの過去の反応により生じた質量差を示し、以降PMDと呼ぶ）に着目したPMDネットワーク解析に着手した。PMDネットワーク解析では、ノードを分子組成式、エッジをPMDとし、特定の反応により生じる反応物と生成物間の質量差（例えば、光化学反応による水酸化や脱アルキル化など）を算出するが、そのプログラムコードの開発に着手した。開発されたコードを用いて、今後は試料中に内在する反応に着目して溶存有機物変換生成物の検出が可能か検討を行う。また、解析対象試料の採取のため野外調査を関東近郊の河川において実施した。排水などの人為的な影響の程度を考慮して、上流から下流までの複数地点において野外調査を実施した。採取した水試料は、メンブレンフィルターによるろ過後、固相抽出法により有機物の精製と抽出を行った。また、基本水質情報として、ｐHや溶存酸素濃度、電気伝導度、全有機炭素などの複数の水質項目の測定を行った。抽出された有機物質は５０％メタノール保管し、フーリエ変換イオンサイクロトロン共鳴質量分析計（FT-ICR MS）による測定を実施した。得られた質量データについては、今後上述の解析アルゴリズムにより解析を進める予定である。

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  • 廃棄汚泥由来バイオ炭の多機能性を活用した高度嫌気性消化技術の開発

    Grant number：21F21340  2021.11 - 2024.3

    日本学術振興会  科学研究費助成事業  特別研究員奨励費

    藤井 学, LIU JIBAO

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    Grant amount：\2800000 （ Direct Cost: \2800000 ）

    嫌気性消化処理は、有機性廃棄物をエネルギー（メタンガス）等に変換することが可能であり、持続可能な社会へ向けて重要な技術となる。本研究では、従来の嫌気性消化処理にバイオ炭添加や促進酸化処理技術を組み合わせることで、廃棄汚泥からのバイオガス生産効率向上や新興汚染物質の除去などを可能とする高度嫌気性消化技術を開発する。研究初年度では、原料として廃棄活性汚泥を活用し、熱分解ならびに鉄の添加処理により鉄含有バイオ炭の合成を行った。鉄含有バイオ炭存在下での過硫酸塩による酸化処理では、活性汚泥フロックを効率的に破砕することができ、バイオガス生成における中間物質（酢酸などの揮発性脂肪酸）の生産量を向上させることができた。例えば、鉄含有バイオ炭存在下では、揮発性脂肪酸の生成量が1.5倍増加することが確認できた。しかし、過硫酸塩による酸化処理で残留した過硫酸塩が、後段の微生物処理における阻害機能を示し、残留性過硫酸塩の除去や逓減が今後に検討すべき重要な課題となった。また、使用した、鉄含有バイオ炭の物性分析（表面特性や細孔分析等）も電子顕微鏡法や窒素吸着法により実施した。さらに、嫌気性消化に関わる微生物の菌叢解析において重要となるネットワーク解析を実施した。ネットワーク解析は、微生物間相互作用やキーストーン種を検出するために有用と考えられるが、既存の相関関係ベースのネットワーク解析では、微生物間相互作用の非線形性を十分に考慮できていない懸念があった。そこで本研究では、PCA-PMIなど非線形的な共起関係に基づきネットワーク解析を実施可能なワークフローを構築した。その結果、これまでの線形解析では検出できなかった、嫌気性消化に重要なメタン菌などを重要種として検出することに成功した。

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  • 新規窒素ドープ炭素材料を活用した新興汚染物質の促進酸化処理技術の開発

    Grant number：21F20044  2021.4 - 2023.3

    日本学術振興会  科学研究費助成事業  特別研究員奨励費

    藤井 学, ZHANG BEI

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    Grant amount：\2300000 （ Direct Cost: \2300000 ）

    医薬品などの新興汚染物質の多くが難分解性を示すため、従来の生物処理では十分に除去することができない。本研究では、新興汚染物質を効率的に分解可能な酸化処理技術を開発する。熱分解処理法などを活用してバイオマスから多孔質性のグラフェンを合成することで、低廉で資源制約のない炭素吸着剤を創出する。そして、実環境を想定した汚染物質の吸着除去試験を通して、新たな水処理技術を開発する。研究初年度は、低廉なバイオマスであるクラフトリグニン（木材加工産業における廃棄物）を材料とした多孔性炭素質材料の合成を行った。鉄系触媒存在下での熱分解や燃焼温度の最適化、強酸処理を行い、リグニン廃棄物より磁性グラフェン様炭素材など種々の多孔性炭素材を合成した。合成材料の物性特性には、電子顕微鏡やBET表面積分析などを用いた。また、新興汚染物質の代表として、ビスフェノールa（BPA）とデキサメタゾン（DEX）を選定し、合成された炭素材の処理性能を評価した結果、10分以内の迅速な吸着除去性能を確認できた。さらに、過硫酸塩（PMS）を添加することで、促進的酸化（AOP）処理を行った結果、炭素材はPMS系でラジカルの発生を活性化し、BPAとDEXの分解において触媒的機能を発揮することが確認された。汚染物質の除去効率と変換生成物を液体クロマトグラフィー質量分析法（LCMS）により分析を行った。また、ここで使用した磁気特性を有する炭素材は、炭素材再生過程で磁気分離・回収が可能であることも確認できた。

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  • 新規窒素ドープ炭素材料を活用した新興汚染物質の促進酸化処理技術の開発

    Grant number：20F40044  2020.11 - 2023.3

    日本学術振興会  科学研究費助成事業  特別研究員奨励費

    藤井 学, ZHANG BEI

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    Grant amount：\2300000 （ Direct Cost: \2300000 ）

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  • 新規C3N5型光触媒を用いた水素ガス同時生成を可能とする排水酸化処理技術の開発

    Grant number：20F20342  2020.11 - 2023.3

    日本学術振興会  科学研究費助成事業  特別研究員奨励費

    藤井 学, SETHUMATHAVAN VADIVEL

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    Grant amount：\2300000 （ Direct Cost: \2300000 ）

    河川や湖沼、海域など世界各国の水域では、医薬品や農薬、食品添加物などの様々な人為由来の汚染物質が検出されている。本研究では、光触媒作用による汚染物質の効率的な酸化分解除去へ向け新たな排水酸化処理技術の開発を目的とする。今年度の研究では、これまでに合成されたg-C3N5ヘテロ接合構造体を用いて、種々の条件下において新興汚染物質（ファビピラビル：COVID-19患者に対する治療薬）の分解性能試験を行うことで、g-C3N5ヘテロ接合構造体による分解メカニズムを解明するとともに、実験系の最適化を行った。具体的には、gC3N5/ Bi4O5Br2複合体ならびにg-C3N5単体とBi4O5Br2単体を用いてファビピラビルの除去試験を実施した結果、光触媒としてg-C3N5とBi4O5Br2を用いた系では可視光照射（60分程度）によるファビピラビルの除去率は60%以下であった。一方で、gC3N5/ Bi4O5Br2複合体を添加した系では94%の除去率を達成した。また、ベンゾキノンやエタノールアミン、イソプロパノールなどのラジカル捕捉剤として使用し、分解反応に関与している主要なラジカルを調べた結果、g-C3N5/Bi4O5Br2光触媒を用いた分解では、ベンゾキノンやエタノールアミンに影響を受けた。従って、ファビピラビルの分解反応においてスーパーオキシドやヒドロキシラジカルが主たるラジカルであることが確認された。以上に加え、光触媒濃度の影響を明らかにするため、g-C3N5/Bi4O5Br2複合材濃度を変化させ、ファビピラビルの分解試験を行った。その結果、触媒濃度を1 g/Lまで増加させると処理効率は増大した。従って、触媒濃度がある閾値以上の値を取ると凝集による触媒表面積低下や可視光吸収活性低下、光透過性の低下等が原因でファビピラビルの分解が制限されることが示唆された。

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  • 新規窒素ドープ炭素材料を活用した新興汚染物質の促進酸化処理技術の開発

    Grant number：20F30044  2020.9 - 2023.3

    日本学術振興会  科学研究費助成事業  特別研究員奨励費

    藤井 学, ZHANG BEI

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    Grant amount：\2300000 （ Direct Cost: \2300000 ）

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  • 新規窒素ドープ炭素材料を活用した新興汚染物質の促進酸化処理技術の開発

    Grant number：20F20044  2020.7 - 2023.3

    日本学術振興会  科学研究費助成事業  特別研究員奨励費

    藤井 学, ZHANG BEI

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    Grant amount：\2300000 （ Direct Cost: \2300000 ）

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  • 量子ドット・ランタノイド複合光触媒を活用した新興微量汚染物処理技術の開発

    Grant number：19F19349  2019.11 - 2022.3

    日本学術振興会  科学研究費助成事業  特別研究員奨励費

    藤井 学, ALKALLA MOHAMED

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    Grant amount：\2300000 （ Direct Cost: \2300000 ）

    本研究では、量子ドットを活用することで、新興微量汚染物質を高効率で除去可能な新たな促進酸化処理技術の開発を行った。炭素量子ドット（CQDs）は量子スケールにおいて発揮するユニークな静電的・物理化学的特性を有し、高い汚染物質吸着性や電荷分離能が期待される。さらに、ランタノイド等の金属で修飾することにより、光を逐次的に吸収させ、近赤外や可視光から紫外光へ変換することも期待できる。研究二年目では、炭素材料としてCQDやグラファイト状窒化炭素（g-C3N4）、また、ならびに触媒としてBi2WO6、Er2WO6、ZrV2O7を用いて複合系触媒を合成した。そして、SETやTEM, EDS等を用いた物性評価を行い、触媒粒子がナノスケールで均一に分散していること、ならびに、高い表面積を有することが確認された。Tauc解析から、合成された触媒は、従来の二酸化チタンより低いバンドギャップを有することが明らかとなった。開発された触媒を用いて、光照射下でカルボフランならびにアトラジンの分解試験を実施した。その結果、複合材を使用した系では、CQDsならびにg-C3N4の単体を使用した系と比較して、3-30倍程度汚染物質の除去効率が上昇した。CQDs/Bi2WO6の複合材を使用した系では、他の複合材と比較して1.3-3倍、除去効率が上がった。以上の複合系触媒の使用による除去効率の向上は、炭素材料とランタノイド触媒の間に発生する相乗効果（バンドギャップ低下等）に起因するものと考えられる。

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  • 下水処理水からの難分解性有機物除去を目的としたナノカーボン複合吸着材の開発

    Grant number：19F19055  2019.7 - 2021.3

    日本学術振興会  科学研究費助成事業  特別研究員奨励費

    藤井 学, ELSAMADONY MOHAMED

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    Grant amount：\2300000 （ Direct Cost: \2300000 ）

    今年度の研究では、化学酸化ならびに沈殿法によりナノカーボン-金属複合材の合成を行い、難分解性有機物（代表汚染物としてカルボフランを使用）の分解効率向上を図った。炭素材としてはカーボンナノチューブを、金属としては酸化鉄ナノ粒子（磁鉄鉱）を用いて合成を行った。合成された複合材の物性に関して、各種高度分析（XRD、FTIR、BET、TEM等）により結晶構造や官能基、表面積、粒子形状等を明らかにした。合成された複合材ならびにカーボンナノチューブ単体を用いた汚染物分解試験を実施した結果、反応系のpHや複合体濃度、反応時間等の諸条件により分解程度（全有機炭素濃度の除去量）は異なったものの、複合材はカーボンナノチューブ単体より汚染物質の分解においておよそ２倍程度高効率であることが分かった。合成された複合体に含まれる鉄イオンがフェントン様反応によりヒドロキシラジカルなどの活性酸素種の生成を促進させ、この酸化作用と炭素材への吸着作用の相乗効果により効率的な分解・吸着除去が生じることが分かった。また、当該試験では、全有機炭素濃度の変化のみならず、分解過程で生じる変換物質を液体クロマトグラフィー質量分析（LC-MS）により同定した。さらに、複合材の再利用性を評価するため、同一の複合材を用いた汚染物処理試験を４連続で実施し、試験後においても分解効率は20%程度の低下にとどまることが分かった。以上の暗条件の実験に加え、明条件の試験において汚染物の分解効率が高まったことから、複合体は光触媒活性を有することが明らかとなった。複合体の持つ光触媒活性の詳細については、今後の検討課題である。以上、今年度の研究では、新たにナノカーボン-金属複合材を合成し、この複合材を水処理試験に供することで、より効率的な汚染物質除去が可能となることが分かった。

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  • Reaction pathway analysis of organic micropollutants in advanced oxidation process by quantum chemical calculation

    Grant number：19K21986  2019.6 - 2021.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Challenging Research (Exploratory)

    Fujii Manabu

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    Grant amount：\6370000 （ Direct Cost: \4900000 、 Indirect Cost：\1470000 ）

    In the treatment of various organic micropollutants such as pharmaceuticals and pesticides by using advanced oxidation process, it is important to fully understand their decomposition pathways and perform appropriate treatment to control the formation of harmful transformation product as well as treatment efficiency. This study investigated the reaction pathways of micropollutants using quantum chemical calculations to verify the applicability of theoretical calculations to the oxidative decomposition of micropollutants. More specifically, phenol was selected as a representative pollutant, and theoretical estimation of reaction sites and reaction rates were performed for oxidative degradation by OH radicals. Among the three level of theory examined in this study, M06-2X was found to be the most accurate in determining the degradation reaction site and rate constant.

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  • Molecular level analysis of dissolved organic matters for investigating origin and transport mechanisms of dissolved iron in watersheds

    Grant number：19H02271  2019.4 - 2022.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (B)

    Manabu Fujii

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    Grant amount：\17290000 （ Direct Cost: \13300000 、 Indirect Cost：\3990000 ）

    Dissolved iron transported from rivers and other terrestrial sources plays important roles in maintaining the coastal and marine productivity. Most of the dissolved iron is likely to be transported from river basins to coastal waters in the form of complexes with dissolved organic matters. However, the molecular level mechanism of transport has not been fully understood. This study therefore aimed to investigate the molecular composition and origin of dissolved organic matters that are highly relevant to dissolved iron via the molecular level analysis using high-resolution mass spectrometry and advanced molecular composition identification algorithms. As a result, 259 dissolved organic molecules highly correlated with dissolved iron were obtained in downstream regions such as coastal waters, and most of them were found to be CHO-type organic matters with small molecular weight and highly decomposed status.

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  • Carbon-metal nanocomposites for enhancement of biofuel production from waste activated sludge

    Grant number：18F18061  2018 - 2019

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for JSPS Fellows

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    Authorship：Principal investigator  Grant type：Competitive

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  • Elucidation of nitrogen fixing property and overgrowth mechanism of toxic cyanobacteria in view of environmental behavior of molybdenum

    Grant number：17H04588  2017 - 2019

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (B)

    Fujii Manabu

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    Authorship：Principal investigator  Grant type：Competitive

    The purpose of this study was to identify the environmental water quality factors that can affect the occurrence of toxic cyanobacteria through the laboratory-based algal culturing experiment in addition to the field survey in semiclosed freshwater lakes (in Japan and Australia). Consequently, this study identified that concentrations of major metals (e.g., calcium etc) and trace metals (e.g., iron, copper, etc.) are tightly related to the occurrence of cyanobacterial toxin (cyanotoxin). Therefore, the management of water qualities focusing on not only traditionally important major nutrients (i.e., nitrogen and phosphorous) but also other water qualities (in particular metals) will be recommended in view of the management of cyanotoxin occurrence in the lakes.

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  • Chemical speciation and biotoxicity of antimony

    Grant number：17F17374  2017 - 2019

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for JSPS Fellows

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    Authorship：Principal investigator  Grant type：Competitive

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  • Why noroviruses are accumulated in oysters: To unravel the mechanisms

    Grant number：17H06213  2017 - 2019

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Challenging Research (Pioneering)

    Omura Tatsuo

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    Authorship：Principal investigator  Grant type：Competitive

    The dynamics of norovirus, one of the causative agent of infectious gastroenteritis, in the estuarine environment is not well understood. In this study, based on the hypothesis that planktons in seawater can be the important carrier of norovirus to oysters, field study was conducted. Norovirus GII RNA were detected from sorted zooplankton and phytoplankton samples, and oyster digestive tissues. The maximum concentrations of norovirus GII RNA were 3900 copies/L in plankton samples, 58 copies/individual of zooplankton, and 2000 copies/g of oyster digestive tissues. DNA metabarcoding analysis indicated that oysters prey on zooplankton (phylums Cercozoa and Ciliophora) and phytoplankton (phylum Chlorophyta, and Ranthkea_octopunctata). Correlation of norovirus GII with some specific planktonic species (e.g., Rathkea_octopunctata, Sarsia_tubulosa) were found, implying the important roles of such species as potential norovirus carrier.

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  • Evaluation of primary productivity in coastal waters based on biogeochemical behavior of iron

    Grant number：16H04435  2016 - 2019

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (B)

    Fujii Manabu

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    Authorship：Principal investigator  Grant type：Competitive

    Iron is an essential micronutrient for organisms, as this trace element plays a role in the photosynthesis and nitrogen fixation of primary producers including phytoplankton. In the open ocean, there is a region where growth of phytoplankton is limited due to lack of iron, and in the past decades studies on iron chemical speciation and bioavailability have been advanced particularly in the research area of oceanography. However, knowledge on the iron dynamics in rivers, estuaries and coastal areas are less accumulated, and the effects of human activities on water transport to the coastal areas and biological basic production are in many cases unknown. Therefore, this study has investigated the impact of land use in the river basin to the coastal primary productivity by examining the biogeochemical dynamics (e.g., redox kinetics, coagulation behavior, algal iron uptake) in rivers and coastal area.

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  • Transportation mechanism of organic matter and trace metals from forest to coastal area for sustainable aquaculture

    Grant number：15KT0022  2016 - 2019

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (B)

    WATANABE Toru

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    Grant type：Competitive

    Load of dissolved trace metals was dependent on land use such as forest, farmland and urban area. Especially paddy field and urban area showed a high load, indicating that human activities, as well as forest, in terrestrial area are important sources of trace metals supplied to coastal area. As organic matters playing an important role in transportation of trace metals, quantitative and qualitative changes of soil organic matters collected in forest and farmland, which can happen during the transportation due to increase of salinity, were investigated. The result demonstrates the changes were affected by species of tree and crop. In estuaries, flocculation of organic matter makes metals insolubilized. We revealed that behavior of metals there can be categorized into four types: (Fe), (Mn), (Al, V) and (Ni, Cu, Zn) and that iron becomes insolubilized most significantly in the presence of suspended solids and aggregates.

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  • Iron uptake model by phytoplankton in actual natural water based on chemical kinetics

    Grant number：25709045  2013 - 2016

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Young Scientists (A)

    Fujii Manabu

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    Authorship：Principal investigator  Grant type：Competitive

    Iron is important factor that control growth and metabolism of phytoplankton in natural waters. Therefore, iron chemical dynamics and bioavailablity have been investigated for the last few decades. Yet, effects of water and environmental factors on iron uptake in actual water environment remained largely unclear, partially because humic substances and other water quality factors were not considered in the previous model where synthetic ligands were often used. In this study, kinetic model for iron transformation and bioavailability was developed based on the kinetic data from phytoplankton incubational experiment under actual natural water conditions where concentrations of humic substances and other water quality factors were manipulated. One of results indicated that phytoplankton is capable of acquiring iron at sufficient amount even under the dark condition, as dark reduction in the presence of humic substances sufficiently produces biologically available ferrous iron form.

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  • Mechanism for photochemical reaction of organically complexed iron

    Grant number：24860013  2012.8 - 2014.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Research Activity Start-up

    ITO Hiroaki, WATANABE Toru, FUJII Manabu

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    Grant amount：\2990000 （ Direct Cost: \2300000 、 Indirect Cost：\690000 ）

    The aim of this study was to develop chemical reaction model of organically complexed iron in natural water under solar radiation. At first, the reaction of complex composed of model organic matter and Fe(II) was observed, and rate constants of complexation and dissociation were estimated. Then, the changes of organic matter by radiation were examined. Photolysis of aromatic-like moiety with the higher excitation wavelength was especially high; i.e., it decreased by 50% in 12 hours radiation. On the other hand, protein-like moiety increased by 20%. However, the rate constant of complexation did not show significant change. Although aromatic and humic-like moieties are considered to be related to the complexation with iron, it was indicated that their ability for iron complexation would not change significantly even after partial photolysis.

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  • Kinetics and Mechanism of Reactive Oxygen Species in a lake

    Grant number：23760501  2011 - 2013

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Young Scientists (B)

    FUJII Manabu

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    Authorship：Principal investigator  Grant type：Competitive

    Although it is important to understand the behavior of reactive oxygen species (ROS) for proper assessment of aquatic ecosystem due to the high reactivity of ROS with a range of molecules and chemical compounds, kinetics and mechanism of ROS redox reactions in particular the factor(s) influencing ROS formation still remain largely unclear. In this study, effect of photochemical reaction of humic substances on ROS generation was investigated, yielding that aromatic content in humic substance is one of major factors responsible for ROS generation (e.g., superoxide and hydrogen peroxide) in sunlit freshwater systems.

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  • 沿岸域での鉄の起源と生物摂取機構の解明及びそれに基づく沿岸域生態系評価手法の開発

    Grant number：07J03731  2007 - 2009

    日本学術振興会  科学研究費助成事業  特別研究員奨励費

    藤井 学

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    Grant amount：\3300000 （ Direct Cost: \3300000 ）

    鉄はほぼすべての生物の生長に必要不可欠な微量栄養素である。鉄の化学種は,多様な水環境中で特に河口・沿岸域においてダイナミックに変化し,一次生産を支配する因子となっている。本研究課題では,藍藻類に着目しその摂取機構を解明すること,そして流域レベルで鉄が藻類に及ぼす影響を評価することを目的としている。本年度の研究では,まず,様々な培養条件下で放射性同位体Feの取り込み試験を実施し,反応速度論モデル結果と照合することで,藍藻類は水中で一時的に生成される還元態鉄の第一鉄Fe(II)を摂取することを明らかにした。Fe(II)の生成には,暗条件では活性酸素種の一種であるスーパーオキシドの還元反応が寄与し,明条件では光エネルギーによる有機リガンドの励起を介した反応が優位であることが分かった。もう一つの成果としては,数値シミュレーションにより河口・沿岸域における鉄の移流・拡散を再現できたことが挙げられる。連続の式やナビエストークスの式に,鉄とフミン物質の錯形成反応モデルを組み込むことで,宮城県松島湾流域における有機鉄の動態をシミュレートした。その結果,調査で得られた溶存態鉄濃度と時空間的に適合した。また,数値計算および実測の結果から,松島湾では藻類の成長に十分な鉄濃度が存在することが明らかとなった。今後は,鉄の酸化還元反応を組み込むことで,藻類に利用可能な鉄形態であるFe(II)が時空間的にどう変化するのかを予測評価していく必要があると考えるが,そのために必要な反応速度論モデルや,移流・拡散モデル,Fe(II)の定量手法等の要素技術は,本研究期間の3年間において開発することができたと評価する。

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  • 流域でのフミン鉄の挙動に着目した河口・沿岸域生態系保全のための流域管理手法の開発

    Grant number：05J04725  2005 - 2006

    日本学術振興会  科学研究費助成事業  特別研究員奨励費

    藤井 学

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    Grant amount：\1900000 （ Direct Cost: \1900000 ）

    毒素生産シアノバクテリアであるL.majusculaは,自らスーパーオキシドを生成し,熱力学的に安定な第二鉄(Fe(III))をより溶解度の高い第一鉄(Fe(II))に還元することで鉄を摂取すると考えられている。しかし,この鉄摂取戦略を議論する上で必要不可欠である,沿岸域で優位なフミン鉄や水酸化鉄とのスーパーオキシドの反応性は未だ把握されていない。平成18年度では,スーパーオキシドを介したL.majusculaによる鉄摂取経路解明を行った。
    まず,キサンチンの酸化によりスーパーオキシドを生成し,還元反応により生じたFe(II)をフェロジンによりトラップすることで,鉄を摂取する過程を室内実験で再現した。生物利用可能なFe(II)の生成実験から,スーパーオキシドによるフミン鉄の生物利用性はその起源により異なるが,酸性官能基を多く含むフミン物質に結合した鉄ほど生物利用性(還元速度)が低いことが明らかとなった。また,Fe(II)生成に関わる各種反応速度を測定した結果,フミン鉄の中でも特に強く結合している錯体は,錯体が還元された後解離し,摂取される経路が優位であった。以上の結果は,フミン物質の起源,すなわち土地利用や植生等の流域環境の違いが,沿岸域での鉄の生物利用性に大きな影響を与えることを示す。また,実験的に算出されたFe(II)生成に関わる各種反応速度を用いて,L.majusclaの鉄摂取に関する新たな反応スキーム(鉄摂取モデル)が構築された。
    以上の研究から,スーパーオキシドを用いた藻類の鉄摂取過程に関する新たな知見が得られ,鉄摂取モデルの構築に成功している。前年度までに構築されている,沿岸域でのフミン鉄の錯平衡及び凝集モデルや,潮流拡散モデルを融合させることで,鉄の供給形態から生物摂取までの一連の過程を総合的に捉えた上で,鉄の生物利用性を評価することが可能となった。

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