title: Development of a trickle bed reactor of electro-Fenton process for wastewater treatment.
abstract: To avoid electrolyte leakage and gas bubbles in the electro-Fenton (E-Fenton) reactors using a gas diffusion cathode, we developed a trickle bed cathode by coating a layer composed of carbon black and polytetrafluoroethylene (C-PTFE) onto graphite chips instead of carbon cloth. The trickle bed cathode was optimized by single-factor and orthogonal experiments, in which carbon black, PTFE, and a surfactant were considered as the determinant of the performance of graphite chips. In the reactor assembled by the trickle bed cathode, H2O2 was generated with a current of 0.3A and a current efficiency of 60%. This performance was attributed to the fine distribution of electrolyte and air, as well as the effective oxygen transfer from the gas phase to the electrolyte-cathode interface. In terms of H2O2 generation and current efficiency, the developed trickle bed reactor had a performance comparable to that of the conventional E-Fenton reactor using a gas diffusion cathode. Further, 123 mg L(-1) of reactive brilliant red X-3B in aqueous solution was decomposed in the optimized trickle bed reactor as E-Fenton reactor. The decolorization ratio reached 97% within 20 min, and the mineralization reached 87% within 3h.
authors.affiliation: Key Laboratory of Reservoir Aquatic Environment, Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing 401122, PR China; School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, PR China.
authors.forename: Yangming
authors.initials: Y
authors.lastname: Lei
authors.forename: Hong
authors.initials: H
authors.lastname: Liu
authors.forename: Zhemin
authors.initials: Z
authors.lastname: Shen
authors.forename: Wenhua
authors.initials: W
authors.lastname: Wang
mesh_terms: D001391:Azo Compounds / Q000737:chemistry*; D004566:Electrodes; D004572:Electrolysis; D006108:Graphite / Q000737:chemistry; D006861:Hydrogen Peroxide / Q000737:chemistry*; D009282:Naphthalenesulfonates / Q000737:chemistry*; D011138:Polytetrafluoroethylene / Q000737:chemistry; D053260:Soot / Q000737:chemistry; D014865:Waste Disposal, Fluid / Q000379:methods*; D062065:Wastewater; D014874:Water Pollutants, Chemical / Q000737:chemistry*
chemical_list: D001391:Azo Compounds; D006108:Graphite; D006861:Hydrogen Peroxide; D009282:Naphthalenesulfonates; D011138:Polytetrafluoroethylene; D053260:Soot; D062065:Wastewater; D014874:Water Pollutants, Chemical; C520101:Reactive brilliant red X-3B
keywords: Electro-Fenton process; Reactive brilliant red X-3B; Trickle bed reactor; Wastewater treatment