Synergistic degradation for o-chlorophenol and enhancement of power generation by a coupled photocatalytic-microbial fuel cell system. (April 2022)

• Record Type: Journal Article
• Authors: Wang, Chengzhi; Wu, Guanlan; Zhu, Xiaolin; Xing, Yi; Yuan, Xing; Qu, Jiao
• Is Part Of: Chemosphere. Volume 293(2022)
• Publication Date: 2022-04
• Subjects: Microbial fuel cell -- Photocatalytic -- o-chlorophenol -- Coupling system -- Dissolved oxygen; Pollution -- Periodicals; Pollution -- Physiological effect -- Periodicals; Environmental sciences -- Periodicals; Atmospheric chemistry -- Periodicals; 551.511
• DOI: 10.1016/j.chemosphere.2022.133517
• Languages: English
• ISSNs: 0045-6535

Abstract

Abstract: A hierarchically photocatalytic microbial fuel cell system (PMFC) coupled with TiO2 photoanode and bioanode was established to enhance the power generation based on single-chamber MFC. Compared with the conventional anaerobic mode, oxygen in the solution could be utilized by the photoanode of PMFC to improve the removal of o-chlorophenol (2-CP). The maximum power densities were increasing from 261 (MFC) to 301 mW/m 2 (PMFC). The removal efficiency of 2-CP (5 mg/L) in PMFC was 76.20% and higher than that in MFC (19.33%) and by photocatalysis (49.23%). The electron-hole separation efficiencies were decreasing with the increasing of dissolved oxygen, causing a low efficiency of photocatalysis, due to the reduction of the current density of the systems. The abundance of Geobacter sp., PHOS-HE36 fam., and Pseudomonas sp. was increased with illumination, contributing to improve the electricity production and 2-CP degradation. The only detective intermediate of 1, 2-dichlorobenzene in PMFC indicated that the microbes could regulate the degradation pathway of 2-CP in the coupling system. These findings provided an feasible method for the effective degradation of refractory organic compounds and simultaneous energy recovery by combining photocatalysis and microbial power generation. Graphical abstract: Image 1 Highlights: A photocatalysis and MFC coupled system, utilizing dissolved oxygen, was established. There was a synergistic effect between photocatalysis and bioelectrochemistry. The abundance of PHOS-HE36 fam. and Pseudomonas sp. was enhanced with illumination. The behavior of microbes regulated the degradation pathways of the coupled system.