Photoelectrocatalytic destruction of organics using TiO2 as photoanode with simultaneous production of H2O2 at the cathode

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	Photoelectrocatalytic destruction of organics using TiO2 as photoanode with simultaneous production of H2O2 at the cathode
	W. H. Leng; W. C. Zhu; J. Ni; Z. Zhang; J. Q. Zhang; C. N. Cao
	2006
发表期刊	Applied Catalysis a-General
ISSN	0926-860X
卷号	300 期号:1 页码:24-35
摘要	Research on the photoelectrocatalytic (PEC) oxidation of organic contaminants, the role of cathodes during photocatalysis has usually been disregarded. This paper reports a study of the PEC decomposition of aniline and salicylic acid with simultaneous production of hydrogen peroxide in a divided reactor using TiO2 as a photoanode. Two types of TiO2 electrode were used. Thermal oxidation electrodes (TO-TiO2) were made by oxidation of titanium metal sheet; sol-gel electrodes (SG-TiO2) were made by coating and then heating a layer of titania gel on titanium sheet. Saturated photocurrent was used to carry out an initial characterization and optimization of both electrode types. The best TO-TiO2 electrodes were prepared by heating titanium at 600-700 degrees C in air. For the SG-TiO2 electrodes, optimum performance was obtained by heating at 500 degrees C. These electrodes were then used to photodegrade aniline and salicylate. The SG-TiO2 electrodes turned out to be superior to the TO-TiO2 electrodes in terms of PEC rate under the same conditions but the difference in rate between the two electrodes was comparable under a high enough bias potential. The most important factors affecting the production of H2O2 in the cathode compartment are presented. The current efficiencies for the accumulation of H2O2 were remarkably affected by the cathode used, PH value, cur-rent density, and metal cations such as copper and iron ions. An expected H2O2 concentration could be obtained by controlling either the magnitude of the photocurrent or illumination time. The maximum current efficiency for the cathodic reduction of oxygen to H2O2 was as high as 90.1% when graphite was used as the cathode. Compared to the SG-TiO2 electrode, the TO-TiO2 electrode had a higher light to electricity conversion efficiency, thus it turned out to be more suitable for the production of H2O2. Furthermore, the role of in-situ reduced oxygen species in the PEC decomposition of aniline was evaluated. (c) 2005 Elsevier B.V. All rights reserved.
部门归属	zhejiang univ, dept chem, hangzhou 310027, peoples r china. chinese acad sci, met res inst, state key lab corros & protect met, shenyang 110016, peoples r china.;leng, wh (reprint author), zhejiang univ, dept chem, yuquan campus, hangzhou 310027, peoples r china;lengwh@css.zju.edu.cn
关键词	Photoelectrocatalytic Thermal Oxidation Electrodes Sol-gel Electrodes Titanium Dioxide (Tio2) Hydrogen Peroxide Production Ptfe O-2-fed Cathode Thin-film Electrode Titanium-dioxide Hydrogen-peroxide Photocatalytic Production Suspended Tio2 Salicylic-acid Formic-acid Aniline Degradation
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WOS记录号	WOS:000234785600004
引用统计	被引频次：87[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/34291
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	W. H. Leng,W. C. Zhu,J. Ni,et al. Photoelectrocatalytic destruction of organics using TiO2 as photoanode with simultaneous production of H2O2 at the cathode[J]. Applied Catalysis a-General,2006,300(1):24-35.
APA	W. H. Leng,W. C. Zhu,J. Ni,Z. Zhang,J. Q. Zhang,&C. N. Cao.(2006).Photoelectrocatalytic destruction of organics using TiO2 as photoanode with simultaneous production of H2O2 at the cathode.Applied Catalysis a-General,300(1),24-35.
MLA	W. H. Leng,et al."Photoelectrocatalytic destruction of organics using TiO2 as photoanode with simultaneous production of H2O2 at the cathode".Applied Catalysis a-General 300.1(2006):24-35.