title: Improved azo dye decolorization in a modified sleeve-type bioelectrochemical system.
abstract: Bioelectrochemical system (BES) that removes recalcitrant pollutant out of wastewater is of special interest for practice. This study modified the configuration of BES to be a sleeve-type with compact structure. Azo dye (acid orange 7, AO7) in the outer cathode chamber performed a complete decolorization by electrons supplied from acetate oxidized with electricigens in the inner anode chamber. The AO7 decolorization efficiency (DEAO7) was enhanced to be higher than 98% from 0.14 to 2.00 mM. Electrochemical impedance spectroscopy (EIS) analysis showed that the internal resistance of anode, cathode and the whole cell was 26.4, 38.3, and 64.6 Ω, respectively, indicating that the modified configuration with large area and small distance between anode and cathode can result in a lower internal resistance and higher decolorization performance. This is the first study for azo dye decolorization using sleeve-type configuration with highly efficient decolorization by abiotic cathode BES.
authors.affiliation: State Key Laboratory of Urban Water Resource and Environment, School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin 150090, China.
authors.forename: Fanying
authors.initials: F
authors.lastname: Kong
authors.forename: Aijie
authors.initials: A
authors.lastname: Wang
authors.forename: Bin
authors.initials: B
authors.lastname: Liang
authors.forename: Wenzong
authors.initials: W
authors.lastname: Liu
authors.forename: Haoyi
authors.initials: H
authors.lastname: Cheng
mesh_terms: D001391:Azo Compounds / Q000737:chemistry*; D003116:Color; D004396:Coloring Agents / Q000737:chemistry*; D058266:Dielectric Spectroscopy; D055664:Electrochemical Techniques / Q000295:instrumentation*
chemical_list: D001391:Azo Compounds; D004396:Coloring Agents
keywords: Azo dye decolorization; Bioelectrochemical system (BES); Electrochemical impedance spectroscopy (EIS); Sleeve-type configuration