Photoelectrocatalytic degradation of high COD dipterex pesticide by using TiO_2 /Ni photo electrode

作     者：Tao Fang Chao Yang Lixia Liao 

作者机构：The State Key Lab of Urban Water Resource and EnvironmentNational Engineering Research Center of Urban Water Resource&The Academy of Fundamental and Interdisciplinary ScienceHarbin Institute of TechnologyHarbin 150080China College of ScienceNortheast Forestry UniversityHarbin 150040China 

出 版 物：《Journal of Environmental Sciences》 (环境科学学报（英文版）)

年 卷 期：2012年第24卷第6期

页      面：1149-1156页

核心收录：

学科分类：083002[工学-环境工程] 0830[工学-环境科学与工程（可授工学、理学、农学学位）] 082803[工学-农业生物环境与能源工程] 08[工学] 0828[工学-农业工程] 

基　　金：supported by the National Natural Science Foundation of China (No. 21002018) the Fundamental Research Funds for the Central Universities (No.DL12BB01) 

主　　题：photoelectrocatalysis COD removal TiO2 dipterex pesticide 

摘      要：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 NaC1 as the supporting electrolyte, current density = 2.5 mA/cm^2, 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.