title: Degradation of selected organophosphate pesticides in wastewater by dielectric barrier discharge plasma.
abstract: In this paper, degradation of selected organophosphate pesticides (dichlorvos and dimethoate) in wastewater by dielectric barrier discharge plasma (DBD) was studied. DBD parameters, i.e. discharge powers and air-gap distances, differently affect their degradation efficiency. The results show that better degradation efficiency is obtained with a higher discharge power and a shorter air-gap distance. The effect of radical intervention degradation was also investigated by adding radical scavenger (tert-butyl alcohol) to the pesticide solution during the experiments. The result shows that the degradation efficiency is restrained in the presence of radical scavenger. It clearly demonstrates that hydroxyl radicals are most likely the main driver for degradation process. Moreover, the kinetics indicate that the disappearance rate of pesticides follows the first-order rate law when the initial concentration of the solution is low, but shifts to zero-order at a higher initial concentration.
authors.affiliation: Department of Chemistry, School of Science, Xi'an Jiaotong University, Xi'an, 710049, China.
authors.forename: Yingmei
authors.initials: Y
authors.lastname: Hu
authors.forename: Yanhong
authors.initials: Y
authors.lastname: Bai
authors.forename: Hu
authors.initials: H
authors.lastname: Yu
authors.forename: Chunhong
authors.initials: C
authors.lastname: Zhang
authors.forename: Jierong
authors.initials: J
authors.lastname: Chen
mesh_terms: D002851:Chromatography, High Pressure Liquid; D004006:Dichlorvos / Q000737:chemistry*; D004117:Dimethoate / Q000737:chemistry*; D055664:Electrochemical Techniques / Q000295:instrumentation / Q000379:methods*; D007306:Insecticides / Q000737:chemistry*; D007700:Kinetics; D008962:Models, Theoretical; D058626:Plasma Gases / Q000737:chemistry; D014865:Waste Disposal, Fluid / Q000379:methods*; D062065:Wastewater / Q000032:analysis / Q000737:chemistry; D014874:Water Pollutants, Chemical / Q000737:chemistry*
chemical_list: D004006:Dichlorvos; D004117:Dimethoate; D007306:Insecticides; D058626:Plasma Gases; D062065:Wastewater; D014874:Water Pollutants, Chemical