title: Improved 4-chlorophenol dechlorination at biocathode in bioelectrochemical system using optimized modular cathode design with composite stainless steel and carbon-based materials.
abstract: This study developed and optimized a modular biocathode materials design in bioelectrochemical system (BES) using composite metal and carbon-based materials. The 4-chlorophenol (4-CP) dechlorination could be improved with such composite materials. Results showed that stainless steel basket (SSB) filled with graphite granules (GG) and carbon brush (CB) (SSB/GG/CB) was optimum for dechlorination, followed by SSB/CB and SSB/GG, with rate constant k of 0.0418 ± 0.0002, 0.0374 ± 0.0004, and 0.0239 ± 0.0002 h(-1), respectively. Electrochemical impedance spectroscopy (EIS) demonstrated that the composite materials with metal can benefit the electron transfer and decrease the charge transfer resistance to be 80.4 Ω in BES-SSB/GG/CB, much lower than that in BES-SSB (1674.3 Ω), BES-GG (387.3 Ω), and BES-CB (193.8 Ω). This modular cathode design would be scalable with successive modules for BES scale-up, and may offer useful information to guide the selection and design of BES materials towards dechlorination improvement in wastewater treatment.
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.affiliation: State Key Laboratory of Urban Water Resource and Environment, School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin 150090, China; Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China. Electronic address: waj0578@hit.edu.cn.
authors.forename: Aijie
authors.initials: A
authors.lastname: Wang
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: Hong-Yu
authors.initials: HY
authors.lastname: Ren
mesh_terms: D001669:Biochemical Phenomena; D019149:Bioreactors; D002244:Carbon / Q000737:chemistry; D002733:Chlorophenols / Q000378:metabolism*; D002852:Chromatography, Ion Exchange; D004563:Electrochemistry / Q000379:methods*; D004566:Electrodes / Q000382:microbiology*; D054879:Halogenation; D007700:Kinetics; D013193:Stainless Steel / Q000737:chemistry; D062065:Wastewater / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000378:metabolism*; D018508:Water Purification / Q000379:methods*
chemical_list: D002244:Carbon; D002733:Chlorophenols; D013193:Stainless Steel; D062065:Wastewater; D014874:Water Pollutants, Chemical; C029107:4-chlorophenol
keywords: 4-Chlorophenol (4-CP); Biocathode; Bioelectrochemical system (BES); Carbon-based material; Dechlorination