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The Effect of Air Electrode/AC Supported on Photocatalytic TiO2 for Photo Degradation
Wang Lianchao,Huang Xingjiu,Ye Gang,Liu Wei,Cai Naicai,Liu Jinhuai
Author NameAffiliationE-mail
Wang Lianchao Department of Chemistry, University of Science and Technology of China, Hefei 230026;Hefei Institute of Intelligent Machines, Chinese Academy of Sciences, Hefei 230031  
Huang Xingjiu Department of Chemistry, University of Science and Technology of China, Hefei 230026;Hefei Institute of Intelligent Machines, Chinese Academy of Sciences, Hefei 230031  
Ye Gang Department of Chemistry, University of Science and Technology of China, Hefei 230026  
Liu Wei Hefei Institute of Intelligent Machines, Chinese Academy of Sciences, Hefei 230031  
Cai Naicai College of Chemistry and Molecular Science, Wuhan University, Wuhan 430072  
Liu Jinhuai Hefei Institute of Intelligent Machines, Chinese Academy of Sciences, Hefei 230031 jhliu@iim.ac.cn  
Abstract:
The photo catalytic degradation of activated red in the aqueous solution was studied using TiO2 supported on air electrode and active carbon (AC) as photo catalysts. It was found that the photo catalytic reaction rate of TiO2 was obviously increased by the presence of air electrode and AC supported. The air electrode which has functions of synthesizing H2O2 in situ and photocatalysis was reported. The results also implied that biasing of the electrode at +0.5V led to efficient charge separation. The current density of air (oxygen) electrode had effect on the oxidation rate of azo dye molecule, i=15 mA/cm2, and the rate could reach maximum. With AC mass fraction of about 21% the oxidation rate for TiO2/AC was obviously larger than that for TiO2, but the result was contrary to this for higher AC mass fraction (>30%). The experiment results showed that because TiO2 was supported on active carbon, the effective surface area of the photo catalysis and their absorbability for organic molecules can be increased. The pH in solution had effect on the oxidation rate of organic molecules.
Key words:  Air electrode/AC, TiO2 photo catalyst, Activated red
FundProject:
空气电极/AC作载体对TiO2光催化性能的影响
王连超,黄行九,叶刚,刘伟,蔡乃才,刘锦淮*
摘要:
研究了空气电极和活性碳(AC)作载体对TiO2光催化氧化活性艳红(K-2BP)性能的影响.实验结果表明,用空气电极/AC作载体能显著提高TiO2的光催化反应速度;空气电极不仅具有良好的合成H2O2的性能,而且对TiO2光催化剂可产生大约+0.5 V的偏压作用,大大减小了TiO2光生电荷的复合几率; AC对有机物分子良好的吸附作用提高了有机物分子在TiO2表面及周围的富集浓度,其含量在21%左右可使光催化剂达到最佳的催化效果.复合电极工作电流密度对活性艳红的氧化脱色速度有影响, i=15 mA/cm2,速度达到最大;活性艳红分子在复合电极表面的吸附受溶液pH值的影响;提出了复合电极的工作原理.
关键词:  空气电极/AC  TiO2光催化  活性艳红
DOI:10.1088/1674-0068/17/5/607-612
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