title: Catalytic hydrodechlorination of monochloroacetic acid in wastewater using Ni-Fe bimetal prepared by ball milling.
abstract: Monochloroacetic acid (MCA) is a chemically stable and biologically toxic pollutant. It is often generated during the production of the pesticide dimethoate. Conventional wastewater treatment processes have difficulty degrading it. In this work, the dechlorination effects of Ni-Fe bimetal prepared using ball milling (BM) technology for the high concentrations of MCA in wastewater were examined. The MCA in aqueous solution was found to be degraded efficiently by the Ni-Fe bimetal. However, S-(methoxycarbonyl) methyl O, O-dimethyl phosphorodithioate (SMOPD) in wastewater, a by-product of the dimethoate production process, significantly inhibited the reductive dechlorination activity of Ni-Fe bimetal. Increasing the reaction temperature in the MCA wastewater enhanced the reduction activity of the Ni-Fe bimetal effectively. Oxygen was found to be unfavorable to dechlorination. Sealing the reaction to prevent oxidation was found to render the degradation process more efficient. The process retained over 88% efficiency after 10 treatment cycles with 50 g/L of Ni-Fe bimetal under field conditions.
authors.affiliation: Key Laboratory of Urban Agriculture (North) of Ministry of Agriculture, Beijing University of Agriculture, Beijing, 102206, China, zhuhong80@pku.edu.cn.
authors.forename: Hong
authors.initials: H
authors.lastname: Zhu
authors.forename: Fuyuan
authors.initials: F
authors.lastname: Xu
authors.forename: Jianzhuang
authors.initials: J
authors.lastname: Zhao
authors.forename: Linfang
authors.initials: L
authors.lastname: Jia
authors.forename: Kunming
authors.initials: K
authors.lastname: Wu
mesh_terms: D000085:Acetates / Q000737:chemistry* / Q000302:isolation & purification; D002384:Catalysis; D002713:Chlorine / Q000737:chemistry; D054879:Halogenation; D007501:Iron / Q000737:chemistry*; D009532:Nickel / Q000737:chemistry*; D010084:Oxidation-Reduction; D062065:Wastewater / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000737:chemistry* / Q000302:isolation & purification; D018508:Water Purification
chemical_list: D000085:Acetates; D002713:Chlorine; D007501:Iron; D009532:Nickel; D062065:Wastewater; D014874:Water Pollutants, Chemical; C006972:chloroacetic acid