Long-term effect of carbon nanotubes on electrochemical properties and microbial community of electrochemically active biofilms in microbial fuel cells |
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Authors: | Yaping Zhang Xi Chen Yong Yuan Xingwen Lu Zuoyi Yang Yujie Wang Jian Sun |
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Affiliation: | 1. Guangzhou Key Laboratory of Environmental Catalysis and Pollution Control, School of Environmental Science and Engineering, Institute of Environmental Health and Pollution Control, Guangdong University of Technology, Guangzhou 510006, China;2. South China Institute of Environmental Sciences, Ministry of Environment Protection of PRC, Guangzhou 510655, China |
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Abstract: | Carbon nanotubes (CNTs) have been widely exploited to improve anodic performance, but information is needed on their long-term stability for improvement. Herein, we prepared a novel CNTs-modified graphite felt (CNTs-GF) by a simple and scalable process and evaluated its long-term performance using anaerobic sludge as inoculum. the MFC with CNTs-GF yielded a sustained enhancement of power output, increasing from 1.93 ± 0.09 W m?2 after 1 month to 2.10 ± 0.05 W m?2 after 3 months and reaching 2.00 ± 0.10 W m?2 after 13 month, indicating the enhancement in electricity generation by the CNTs was not declined over one year. However, the bare GF showed a declining tendency of performance during 13 months. The long-term enhancement can be explained by the facts that the CNTs-GF was beneficial to electrochemically active biofilms (EABs) growth and interacted better with EABs and increased the extracellular electron transfer. Community analysis showed an increase in Geobacter in response to CNTs modification. These results demonstrated that CNTs modification could sustain a superior long-term enhancement in MFC performance. |
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Keywords: | Long-term operation CNTs Electrochemically active biofilms Microbial fuel cell |
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