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Microbial fuel cell with an azo-dye-feeding cathode

文献类型： 外文期刊

作者： Liu, Liang 1 ; Li, Fang-bai 1 ; Feng, Chun-hua 3 ; Li, Xiang-zhong 4 ;

作者机构： 1.Guangdong Inst Ecoenvironm & Soil Sci, Guangdong Key Lab Agr Environm Pollut Integrated, Guangzhou 510650, Guangdong, Peoples R China

2.Chinese Acad Sci, Guangzhou Inst Geochem, Guangzhou 510640, Peoples R China

3.S China Univ Technol, Sch Chem & Chem Engn, Guangzhou 510640, Peoples R China

4.Hong Kong Polytech Univ, Dept Civil & Struct Engn, Hong Kong, Hong Kong, Peoples R China

5.Chinese Acad Sci, Grad Univ, Beijing 100039, Peoples R China

关键词： Azo dyes;Degradation;K. pneumoniae;Microbial fuel cell;Orange II

期刊名称：APPLIED MICROBIOLOGY AND BIOTECHNOLOGY （ 2020影响因子：4.813； 五年影响因子：4.697 ）

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收录情况： SCI

摘要： Microbial fuel cells (MFCs) were constructed using azo dyes as the cathode oxidants to accept the electrons produced from the respiration of Klebsiella pneumoniae strain L17 in the anode. Experimental results showed that a methyl orange (MO)-feeding MFC produced a comparable performance against that of an air-based one at pH 3.0 and that azo dyes including MO, Orange I, and Orange II could be successfully degraded in such cathodes. The reaction rate constant (k) of azo dye reduction was positively correlated with the power output which was highly dependent on the catholyte pH and the dye molecular structure. When pH was varied from 3.0 to 9.0, the k value in relation to MO degradation decreased from 0.298 to 0.016 μmol min~(-1), and the maximum power density decreased from 34.77 to 1.51 mW m~(-2). The performances of the MFC fed with different azo dyes can be ranked from good to poor as MO > Orange I > Orange II. Furthermore, the cyclic voltammograms of azo dyes disclosed that the pH and the dye structure determined their redox potentials. A higher redox potential corresponded to a higher reaction rate.

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