高等学校化学学报 ›› 2005, Vol. 26 ›› Issue (4): 727.

• 研究论文 • 上一篇    下一篇

异质结型光催化膜的活性及其机理研究

林熙, 李旦振, 吴清萍, 付贤智, 王绪绪   

  1. 福州大学光催化研究所, 福州 350002
  • 收稿日期:2004-05-08 出版日期:2005-04-10 发布日期:2005-04-10
  • 通讯作者: 李旦振(1952年出生),男,教授,博士生导师,主要从事半导体光催化和纳米光电材料的研究.E-mail:dzli@fzu.edu.cn E-mail:dzli@fzu.edu.cn
  • 基金资助:

    国家自然科学重点基金(批准号:20133010);国家自然科学基金(批准号:20473018,20273014);教育部重点科技项目(批准号:03061);福建省自然科学重大基金(批准号:2003F004);福建省教育厅重点项目(批准号:JA02138)资助.

Photocatalytic Activity and Mechanism of Heterojunction Thin Films

LIN Xi, LI Dan-Zhen, WU Qing-Ping, FU Xian-Zhi, WANG Xu-Xu   

  1. Research Institute of Photocatalysis, Fuzhou University, Fuzhou 350002, China
  • Received:2004-05-08 Online:2005-04-10 Published:2005-04-10

摘要: 采用浸渍提拉法制得TiO2,ZnO,Fe2O3,ZnO/TiO2,TiO2/ZnO,Fe2O3/TiO2和TiO2/Fe2O3石英玻璃基底负载膜.光催化降解亚甲基蓝实验表明,TiO2和ZnO具有良好的光催化活性,Fe2O3活性较差.但形成异质结后,TiO2和Fe2O3的光催化降解能力发生明显的变化.用254nm紫外光光照后,TiO2,ZnO和Fe2O3等3种氧化物膜与水的接触角均有不同程度的降低,TiO2表现出超亲水性,ZnO/TiO2和Fe2O3/TiO2膜与水的接触角小于对应的单纯ZnO和Fe2O3膜与水的接触角,其中Fe2O3/TiO2表面出现超亲水性.瞬态光电导谱的少数载流子寿命的测定表明,异质结势垒电场能有效地增强光生电子-空穴对的分离效率.根据能带理论建立的两组异质结能带模型可合理地解释实验结果.

关键词: 异质结, 光催化, 二氧化钛, 光致亲水性

Abstract: The thin films of TiO2, ZnO, Fe2O3 and heterojunction thin films of ZnO/TiO2, Fe2O3/TiO2 were prepared on quartz glass by dip-coating technique. The photocatalytic degradation of methylene blue on these films(λ=254 nm) showed that the photocatalytic activities of three films were in the following sequence: TiO2>ZnO>Fe2O3, TiO2/ZnO>TiO2>TiO2/Fe2O3. Compared with the films of pure ZnO and Fe2O3, heterojunction films of ZnO/TiO2 and Fe2O3/TiO2 had smaller contact angles, while Fe2O3/TiO2 film showed super-hydrophilic property. To explain this result, a model of heterojunction band of Fe2O3/TiO2, TiO2/Fe2O3 and ZnO/TiO2, TiO2/ZnO were set up. The heterojunction band formed between the two seminconductors interface changed the transfer process of photogenerated electron-hole. Time-resolved photoconductivity spectra and Auger electron spectra results approved this explanation.

Key words: Heterojunction, Photocatalysis, TiO2, Photoinduced hydrophilicity

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