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    Adhesion Mechanisms and Electrochemical Applications of Microorganisms onto a GO-NH2 Modified Carbon Felt Electrode Material

    Year: 2021

    Journal: Ind. Eng. Chem. Res., Volume 60, MAR 24, page 4321–4331

    Authors: Cai, Lifang; Chen, Junjie; Chang, Lu; Liu, Shurui; Peng, Yajuan; He, Ning; Li, Qingbiao; Wang, Yuanpeng

    Organizations: National Natural Science Foundation of China [22038012, 42077030]; Science and Technology Program of Fujian Province, China [2020NZ012015, 2020Y4002]; Fundamental Research Funds for the Central Universities of China [20720190001]

    In this study, a new method comprising graphene oxide (GO) and amino group modifications of carbon felt CF electrode material surfaces was employed to improve the initial adhesion capacities of bacteria and their electrochemical performance. The results, which were located at the negative secondary minimum, demonstrated that the electroactive microorganisms (Shewanella xiamenensis BC01 and Escherichia coli DHSa) only adhered reversibly onto the negatively charged CF-GO surfaces. Our study confirmed that the dominant adhesion mechanism for S. xiamenensis on CF-GO was the Lewis acid-base interaction and that for E. coli on CF-GO was the Lifshitz-van der Waals interaction. The results obtained from the electrochemical systems indicated that the positively charged (amino) modification approach, which exhibited improvements in the bacterial adhesion capacities and electrochemical performance, was more effective than the hydrophilic (GO) modification approach. Additionally, our work also provides plausible guidance for preparing electrodes or film-forming materials with remarkable properties.
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