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pH dependence of quinone-mediated extracellular electron transfer in a bioelectrochemical system

文献类型： 外文期刊

作者： Wu, Yundang 1 ; Li, Fangbai 2 ; Liu, Tongxu 2 ; Han, Rui 2 ; Luo, Xiaobo 2 ;

作者机构： 1.Chinese Acad Sci, Guangzhou Inst Geochem, Guangzhou 510640, Guangdong, Peoples R China

2.Guangdong Inst Ecoenvironm & Soil Sci, Guangdong Key Lab Agr Environm Pollut Integrated, Guangzhou 510640, Guangdong, Peoples R China

3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China

关键词： pH;quinone;extracellular electron transfer;bioelectrochemical system

期刊名称：ELECTROCHIMICA ACTA （ 影响因子：6.901； 五年影响因子：6.016 ）

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收录情况： SCI

摘要： Quinone-mediated extracellular electron transfer (EET) is a well-known and important microbial respiration process in many natural and engineering systems. While it has been recognized that both the speciation of quinones and cell metabolism are pH-sensitive, the pH dependence of quinone-mediated EET is still unclear. In this study, pH effects in the range of 6.2 to 7.8 were investigated in a bioelectrochemical system using 9,10-anthraquinone-2-sulfonic acid (AQS) as a model quinone. The results showed that the current generation increased at pH 6.2-6.8 and then tended to stabilize, with a slight decrease at pH 7.0-7.8. The open circuit voltage (OCV) changed in a similar manner as a function of pH. The cell growth after current generation at different pH values was also indicated by the total DNA, which increased at pH 6.2-6.8 and then decreased at pH 7.0-7.8. Thermodynamic calculations and cyclic voltammetry measurements indicated that the redox potentials of AQS were negatively correlated with pH. At pH 6.2-7.0, both cell growth and the AQS redox properties had positive effects; at pH 7.0-7.8, while the AQS redox properties still had a positive impact on the EET capacity, the decline in the cell density slowed the increase of the EET capacity. These results provide a fundamental understanding of quinone-mediated EET processes and emphasize the importance of pH. (C) 2016 Elsevier Ltd. All rights reserved.

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