影像科学与光化学 ›› 2004, Vol. 22 ›› Issue (3): 161-168.DOI: 10.7517/j.issn.1674-0475.2004.03.161

• 研究论文 •    下一篇

TiO2担载在新型载体上的光催化电极

陈年友1, 蔡乃才2, 王义2, 王鄂风2   

  1. 1. 黄冈师范学院, 化学系, 湖北, 黄冈, 438000;
    2. 武汉大学, 化学与分子科学学院, 湖北, 武汉, 430072
  • 收稿日期:2003-10-17 修回日期:2004-01-17 出版日期:2004-05-23 发布日期:2004-05-23
  • 通讯作者: 陈年友(1956- ),男,副教授,主要从事光催化研究,通讯联系人,E-mail:Chemyou@sohu.com.
  • 基金资助:
    国家自然科学基金(20071026).

A Photocatalytic Electrode with TiO2 Immobillized on the New Supporter

CHEN Nian-you1, CAI Nai-cai2, WANG Yi2, WANG E-feng2   

  1. 1. Department of Chemistry, Huanggang Normal University, Huanggang 438000, Hubei, P. R. China;
    2. College of Chemistry and Molecular Science, Wuhan University, Wuhan 430072, Hubei, P. R. China
  • Received:2003-10-17 Revised:2004-01-17 Online:2004-05-23 Published:2004-05-23

摘要: 介绍了一种将TiO2光催化剂担载在新型载体上的光催化电极.新型载体是用炭质材料和聚四氟乙烯制备的,它具有电合成H2O2的功能.在电流密度为15mA/cm2时,光催化电极不仅具有高达80%的电合成H2O2的电流效率,而且该电极的电位处在0.02V(SCE)左右,使载体表面的TiO2光催化剂获得了约+0.47V的阳极偏压(相对平带电势),对增加TiO2光催化反应效率十分有益.在具有新型光催化电极的光反应体系中,水中的有机分子受到来自溶液中大量·OH自由基(H2O2被紫外光分解的中间产物)的均相氧化(即光化学氧化),以及来自TiO2表面光生空穴的复相氧化(即光催化氧化).在光化学氧化和光催化氧化的联合作用下,有机分子的矿物化反应速度显著提高.

关键词: 光催化电极, TiO2, 载体, 降解, 苯甲酸

Abstract: A photocatalytic electrode with TiO2 immobillized on the new supporter was reported.The new supporter which was prepared using carbon and polytetrafluoroethylene (PTFE) has the function of electrogenerating H2O2.Under 15 mA/cm2,the photocatalytic electrode not only had the current efficiency of synthesizing H2O2 of 82%,but its potential (about 0.02 V(SCE) made a TiO2 on the supporter obtain +0.47 V anodic bia (VS.flat band potential)which was very profitable for increasing efficiency of photocatalytic reaction.So,in a photo-reactor with the photocatalytic electrode,mineralization rate of the organic compounds was greatly enhanced due to joint effect of the homogeneous oxidation of the organic moleculars by ·OH from photodissociation of H2O2 in the solution(oxidation of photochemistry)and heterogeneous oxidation by holes at TiO2 (Photocatalytic oxidation).

Key words: photocatalytic electrode, TiO2 supporter, degradation, benzoic acid

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