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

Tao Fang; Chao Yang; Lixia Liao

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

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

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A TiO_2 thin film electrode deposited on porous nickel net (TiO_2/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, TiO_2 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/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.

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来源
《Journal of environmental sciences》 |2012年第6期|1149-1156|共8页
作者
Tao Fang; Chao Yang; Lixia Liao;
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作者单位

The State Key Lab of Urban Water Resource and Environment, National Engineering Research Center of Urban Water Resource & The Academy of Fundamental and Interdisciplinary Science, Harbin Institute of Technology;

College of Science, Northeast Forestry University;

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收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《化学文摘》(CA);
原文格式 PDF
正文语种英语
中图分类环境与环境系统;
关键词
Photoelectrocatalysis; COD removal; TiO_2; Dipterex; Pesticide;

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

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