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| Inhibitory effects and mechanisms of biochar on microbial Fe（Ⅲ）reduction using Shewanella oneidensis MR-1 |
| Received:July 30, 2021 |
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| KeyWord:microbial Fe（Ⅲ）reduction;biochar;ferrihydrite;Shewanella oneidensis MR-1 |
| Author Name | Affiliation | E-mail | | QIAN Yongming | College of Life Sciences, China West Normal University, Nanchong 637009, China
College of Environmental Science and Engineering, China West Normal University, Nanchong 637009, China | | | REN Dong | College of Environmental Science and Engineering, China West Normal University, Nanchong 637009, China
Chemical Synthesis and Pollution Control Key Laboratory of Sichuan Province, China West Normal University, Nanchong 637009, China | | | TANG Fenglin | Chemical Synthesis and Pollution Control Key Laboratory of Sichuan Province, China West Normal University, Nanchong 637009, China | | | YANG Zhen | College of Urban and Environmental Sciences, Peking University, Beijing 100871, China | | | WU Yundang | Guangdong Key Laboratory of Integrated Agro-environmental Pollution Control and Management/Institute of Eco-environmental and Soil Sciences, Guangdong Academy of Sciences, Guangzhou 510650, China | | | LU Lu | College of Environmental Science and Engineering, China West Normal University, Nanchong 637009, China | | | PENG Chao | College of Life Sciences, China West Normal University, Nanchong 637009, China
Chemical Synthesis and Pollution Control Key Laboratory of Sichuan Province, China West Normal University, Nanchong 637009, China | chpeng89@cwnu.edu.cn |
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| Abstract: |
| It is under debate whether microbial Fe（Ⅲ）reduction is promoted or inhibited by biochar. To explore the mechanisms of how biochar influences microbial Fe（Ⅲ）reduction, this study determined the kinetics of microbial Fe（Ⅲ）reduction using Shewanella oneidensis MR-1 suspension experiments with the addition of biochar and ferrihydrite（Fh）at different concentrations. The aggregates of cells-biochar were visualized using laser scanning confocal microscopy（LSCM）. The redox properties of biochar were analyzed using mediated electrochemical analysis. The results showed that addition of rice straw-derived biochar inhibited the rate of microbial Fh reduction. The inhibiting effect of biochar on microbial Fh reduction was influenced by the concentration of Fh. In addition, the biochar used in this study had relatively high electron donating capacity and was able to chemically reduce Fh, lowering the initial Fh concentration for microbial Fe（Ⅲ）reduction. The image obtained from LSCM showed that cells, but not Fh, were adsorbed on the surface of biochar. These results suggest that rice straw-derived biochar inhibit microbial Fe（Ⅲ）reduction and may be related to the chemical Fh reduction by biochar and formation of cells-biochar aggregates. |
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