Improved Simultaneous Decolorization and Power Generation in a Microbial Fuel Cell with the Sponge Anode Modified by Pol
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Improved Simultaneous Decolorization and Power Generation in a Microbial Fuel Cell with the Sponge Anode Modified by Polyaniline and Chitosan Haitao Xu 1,2 & Luguang Wang 3 & Cunguo Lin 2 & Jiyong Zheng 2 & Qing Wen 1,2 & Ye Chen 1 & Yuyang Wang 4 & Lijuan Qi 1 Received: 6 April 2020 / Accepted: 22 May 2020/ # Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract
In recent years, microbial fuel cell (MFC) has been regarded as a promising technology for dye wastewater treatment. Compared with traditional anaerobic reactors, MFC has better decolorization effect while producing electricity simultaneously. In this paper, a double-chamber MFC with the sponge anode modified by polyaniline and chitosanNCNTs was employed for simultaneous azo dye decolorization and bioelectricity generation. The influence of dye concentration, co-substrate concentration, and operating temperature on the performance of MFC with the modified anodes were studied. The results showed that a high decolorization efficiency (98.41%) and maximum power density (2816.67 mW m−3) of MFC equipped with modified bioanodes were achieved due to the biocompatibility and bioelectrocatalysis of modified material. And the biomass on the modified anode’s surface was increased by 1.47 times. Additionally, microbial community analysis revealed that the modification of polyaniline and chitosan-NCNTs improved the selective enrichment of specific communities and the main microorganism was the electroactive and decolorizing bacteria Enterobacter (62.84%). Therefore, the composite anode is capable of fully utilizing the synergistic role of various materials, leading to superior performance of dye decolorization in MFCs. This work provided a strategy for the research on the recovery of biomass energy and decolorization in wastewater treatment.
Keywords Microbial fuel cell . Decolorization . Azo dye . Chitosan . Polyaniline
* Qing Wen * Ye Chen [email protected] Extended author information available on the last page of the article
Applied Biochemistry and Biotechnology
Introduction Resolving the problem of power deficiency and pollution is the top priority facing world developments. The processes of municipality and industry generate large amounts of dyecontaining wastewater. Azo dyes, with properties of toxic, highly colorful, and persistent chemicals, are widely used in the textile manufacturing, and thus threatening ecosystems and human health [1]. To remove them, conventional physico-chemical method has been carried out to achieve a high removal rate, but it still required a lot of power; at the meanwhile, other normal anaerobic biological treatments take long decomposition periods with low decolorization efficiency. As an economical and effective method, the microbial fuel cell (MFC) combines with the advantages of both biological and electrochemical methods, utilizing bacteria as a biocatalyst to convert chemical energy from organic matters into electricity [2–4]. Recent studies have shown that MFCs could remove a variety of pollutants,
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