Photoelectrocatalytic degradation of high COD dipterex pesticide by using TiO2/Ni photo electrode

doi:10.1016/S1001-0742(11)60882-6

Journal of Environmental Sciences

Volume 24, Issue 6, June 2012, Pages 1149-1156

https://doi.org/10.1016/S1001-0742(11)60882-6 Get rights and content

Abstract

A TiO₂ thin film electrode deposited on porous nickel net (TiO₂/Ni) was prepared by the sol-gel method, and the surface morphology, crystal structure features and the grain size were characterized by Field emission scan electron microscopy (FESEM) and X-ray diffraction (XRD). The photoelectrocatalytic system was set up using a UV high-pressure mercury lamp as the light source, TiO₂ coated on foamed nickel as photo anode, Pt sheet as counter electrode and the pesticide dipterex in synthetic wastewater. Various factors that influence the photoelectrocatalytic decomposition of dipterex pesticide have been studied, such as degradation time, the type of electrolyte, current density, original pH value and different degradation methods. The prepared catalysts were employed to photoelectrocatalytically degrade the pesticide dipterex under UV irradiation, comparing the results with photocatalytic degradation and electrochemical oxidation. The results indicated that under the optimal conditions of 0.02 mol/L NaCl as the supporting electrolyte, current density = 2.5 mA/cm², pH 6.0 and dipterex pesticide 40 mg/L, and reaction time 2 hr, dipterex chemical oxygen demand (COD) removal rate and organophosphorous conversion of up to 82.6% and 83.5% were achieved, respectively. The method of photoelectrocatalytic degradation is more efficient than photocatalysis and electrochemical oxidation. The possible roles of the electrolytes on the reactions and probable mechanisms were also discussed.

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Photoelectrocatalytic degradation of high COD dipterex pesticide by using TiO2/Ni photo electrode

Abstract

Journal of Environmental Management

Desalination

Water Research

Analytica Chimica Acta

Dyes and Pigments

Environment International

Desalination

Journal of Photochemistry and Photobiology A: Chemistry

Desalination

Journal of Environmental Sciences

Applied Catalysis B: Environmental

Journal of Hazardous Materials

Journal of Hazardous Materials

Progress in Organic Coatings

Photoelectrocatalytic degradation of high COD dipterex pesticide by using TiO₂/Ni photo electrode