title: Enhanced degradation of azo dye by a stacked microbial fuel cell-biofilm electrode reactor coupled system.
abstract: In this study, a microbial fuel cell (MFC)-biofilm electrode reactor (BER) coupled system was established for degradation of the azo dye Reactive Brilliant Red X-3B. In this system, electrical energy generated by the MFC degrades the azo dye in the BER without the need for an external power supply, and the effluent from the BER was used as the inflow for the MFC, with further degradation. The results indicated that the X-3B removal efficiency was 29.87% higher using this coupled system than in a control group. Moreover, a method was developed to prevent voltage reversal in stacked MFCs. Current was the key factor influencing removal efficiency in the BER. The X-3B degradation pathway and the types and transfer processes of intermediate products were further explored in our system coupled with gas chromatography-mass spectrometry.
authors.affiliation: School of Energy and Environment, Southeast University, Nanjing 210096, China.
authors.forename: Xian
authors.initials: X
authors.lastname: Cao
authors.affiliation: School of Energy and Environment, Southeast University, Nanjing 210096, China.
authors.forename: Hui
authors.initials: H
authors.lastname: Wang
authors.affiliation: School of Energy and Environment, Southeast University, Nanjing 210096, China.
authors.forename: Xiao-Qi
authors.initials: XQ
authors.lastname: Li
authors.affiliation: School of Energy and Environment, Southeast University, Nanjing 210096, China.
authors.forename: Zhou
authors.initials: Z
authors.lastname: Fang
authors.affiliation: School of Energy and Environment, Southeast University, Nanjing 210096, China. Electronic address: lxnseu@163.com.
authors.forename: Xian-Ning
authors.initials: XN
authors.lastname: Li
mesh_terms: D001391:Azo Compounds / Q000737:chemistry* / Q000378:metabolism; D001674:Bioelectric Energy Sources; D018441:Biofilms; D004566:Electrodes; D008401:Gas Chromatography-Mass Spectrometry; D009282:Naphthalenesulfonates / Q000737:chemistry* / Q000378:metabolism
chemical_list: D001391:Azo Compounds; D009282:Naphthalenesulfonates; C520101:Reactive brilliant red X-3B
keywords: Azo dye; Bioelectricity generation; Biofilm electrode reactor; Coupled system; Microbial fuel cell