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Electrochemical oxidation of dichlorvos on SnO2Sb2O5 electrodes

Paper ID Volume ID Publish Year Pages File Format Full-Text
45341 46410 2014 5 PDF Available
Title
Electrochemical oxidation of dichlorvos on SnO2Sb2O5 electrodes
Abstract

•Electrochemical oxidation of dichlorvos followed Langmuir–Hinshelwood kinetics.•Dichlorvos electro-oxidation kinetics gives the fastest overall rate constants.•Rate limiting step for electro-oxidation is the same as for the mineralization.

The effects of electrode potential and the initial concentration of 2,2-dichlorovinyl dimethyl phosphate (dichlorvos, DDVP) on its oxidation/mineralization reaction kinetics, using an electrochemical oxidation system based on SnO2Sb2O5 anodes, have been studied. Electrochemical degradation followed the Langmuir–Hinshelwood mechanism, with adsorption equilibrium constant K = 0.082 L mg−1 of dichlorvos on the electrode material surface, and reaction rate constant k = 0.021 mg L−1 s−1 of the organic compound-electrocatalyst adduct. Chemical oxygen demand and CO2 measurements in neutral media suggest that the rate limiting step for mineralization is the same as for the electrochemical oxidation. The results show that the electrochemical mineralization of dichlorvos was readily possible at potentials more positive than 2.5 V vs. SCE, with lower reaction half-lives than obtained with other advanced oxidation process. The fastest overall degradation rate constants were obtained at limiting low concentrations of dichlorvos in aqueous solution, kobs = kK = 0.0017 s−1.

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Keywords
Electrocatalysis; Dichlorvos (2,2-dichlorovinyl dimethyl phosphate); Metal oxide electrode; Langmuir–Hinshelwood kinetics; Advanced oxidation process
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Electrochemical oxidation of dichlorvos on SnO2Sb2O5 electrodes
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 144, January 2014, Pages 107–111
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
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Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
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