title: A detailed investigation on electro-Fenton treatment of propachlor: Mineralization kinetic and degradation intermediates.
abstract: In this study, electrochemical removal of propachlor from water has been investigated by electro-Fenton process which provides continuous electrochemical production of hydroxyl radical which is a highly oxidizing agent. This radical can react with propachlor unselectively and can oxidize it into carbon dioxide and water. Effects of applied current, catalyst (Fe2(SO4)3) and supporting electrolyte (Na2SO4) concentrations on the degradation rate of propachlor have been examined and determined as 200 mA, 0.20 mM and 25 mM, respectively. The oxidation reaction showed a second-order reaction kinetic with an absolute rate constant value of (3.6±0.2)×10(9) M(-1) s(-1) which was determined by competition kinetic experiments. Total organic carbon analysis was employed to follow the mineralization of propachlor. The total mineralization was completed in a seven-hour electrolysis at 300 mA indicating that the electro-Fenton process is very effective in the mineralization of propachlor in water. Oxidation of propachlor with hydroxyl radical led to the formation of intermediate species. Some of these species were detected and quantified by chromatographic and spectroscopic methods such as HPLC, GC-MS and IC. A plausible mineralization pathway for the electrochemical removal of propachlor was proposed based on the identified by-products.
authors.affiliation: Anadolu University, Faculty of Science, Department of Chemistry, 26470 Eskişehir, Turkey.
authors.forename: Metin
authors.initials: M
authors.lastname: Gençten
authors.affiliation: Anadolu University, Faculty of Science, Department of Chemistry, 26470 Eskişehir, Turkey. Electronic address: aozcan3@anadolu.edu.tr.
authors.forename: Ali
authors.initials: A
authors.lastname: Özcan
mesh_terms: D000083:Acetanilides / Q000737:chemistry*; D002851:Chromatography, High Pressure Liquid; D004572:Electrolysis; D017665:Hydroxyl Radical / Q000737:chemistry; D007700:Kinetics; D010084:Oxidation-Reduction; D014874:Water Pollutants, Chemical / Q000737:chemistry*; D018508:Water Purification / Q000379:methods
chemical_list: D000083:Acetanilides; D014874:Water Pollutants, Chemical; C011088:propachlor; D017665:Hydroxyl Radical
keywords: Electro-Fenton; Electrocatalysis; Herbicide; Propachlor; Water purification