title: Design of a visible light driven photo-electrochemical/electro-Fenton coupling oxidation system for wastewater treatment.
abstract: In this study, we report on a photo-electrochemical/electro-Fenton oxidation (PEC/EF) system by coupling visible light driven photo-electrochemical oxidation (PEC) and electro-Fenton oxidation (EF) in an undivided cell. Bi2WO6 nanoplates deposited on FTO glass (Bi2WO6/FTO) and Fe@Fe2O3 core-shell nanowires supported on activated carbon fiber (Fe@Fe2O3/ACF) were used as the anode and the cathode in the PEC/EF system, respectively. This novel PEC/EF system showed much higher activity than the single PEC and EF systems on degradation of rhodamine B in aqueous solution at natural pH. Moreover, the degradation and the instantaneous current efficiencies of the PEC/EF system were increased by 154% and 26% in comparison with the sum of those of single PEC and EF systems, respectively. These significant enhancements could be attributed to the synergetic effect from better separation of photo-generated carriers in the photo-anode and the transfer of photo-electrons to the oxygen diffusion cathode to generate more electro-generated H2O2 and hydroxyl radicals on the Fenton cathode. The better separation of photo-generated carriers contribute more to the overall degradation enhancement than the photo-electrons generated H2O2 and the subsequent Fenton reaction on the cathode during the PEC/EF process.
authors.affiliation: Key Laboratory of Pesticide & Chemical Biology of Ministry of Education, College of Chemistry, Central China Normal University, Wuhan 430079, People's Republic of China.
authors.forename: Xing
authors.initials: X
authors.lastname: Ding
authors.forename: Zhihui
authors.initials: Z
authors.lastname: Ai
authors.forename: Lizhi
authors.initials: L
authors.lastname: Zhang
mesh_terms: D001729:Bismuth / Q000737:chemistry; D002244:Carbon / Q000737:chemistry; D000077482:Carbon Fiber; D055664:Electrochemical Techniques; D005290:Ferric Compounds / Q000737:chemistry; D017611:Fluorine Compounds / Q000737:chemistry; D006861:Hydrogen Peroxide / Q000737:chemistry; D008027:Light; D049329:Nanostructures / Q000737:chemistry; D010084:Oxidation-Reduction; D055668:Photochemical Processes; D012235:Rhodamines / Q000737:chemistry / Q000528:radiation effects; D017971:Tin Compounds / Q000737:chemistry; D017973:Tungsten Compounds / Q000737:chemistry; D014865:Waste Disposal, Fluid / Q000379:methods*; D014874:Water Pollutants, Chemical / Q000737:chemistry* / Q000528:radiation effects
chemical_list: D000077482:Carbon Fiber; D005290:Ferric Compounds; D017611:Fluorine Compounds; D012235:Rhodamines; D017971:Tin Compounds; D017973:Tungsten Compounds; D014874:Water Pollutants, Chemical; C000499:ferric oxide; D002244:Carbon; D006861:Hydrogen Peroxide; C029773:rhodamine B; C045358:stannic oxide; D001729:Bismuth