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无机材料学报

无机材料学报

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La/TiO2-SiO2薄膜的光催化性能研究

何静1, 江伟辉2, 于云3, 宋力昕3, 胡行方3   

  1. 1. 山东理工大学材料学院工程系, 淄博 255049; 2. 景?德镇陶瓷学院材料工程学院, 景德镇 333001; 3. 中国科学院上海硅酸盐?研究所特种无机材料研究与发展中心, 上海 200050
  • 收稿日期:2005-01-26 修回日期:2005-04-15 出版日期:2006-01-20 网络出版日期:2006-01-20

Photocatalysis of La/TiO2-SiO2 Thin Films

HE Jing1, JIANG Wei-Hui2, YU Yun3, SONG Li-Xin3, HU Xing-Fang3   

  1. 1. Shandong University of Technology, Zibo 255049, China; 2. School of Material Science and Engineering of Jingdezhen Ceramic Institute,
    Jingdezhen 333001, China; 3. Research and Development Center of Special Inorganic Materials of Shanghai Institute of Ceramics, Chinese Academy of
    Sciences, Shanghai 200050, China
  • Received:2005-01-26 Revised:2005-04-15 Published:2006-01-20 Online:2006-01-20

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摘要： 采用溶胶-凝胶法制备了不同掺杂量的La/TiO2-SiO2复合薄膜. 通过XRD、FE-SEM和AFM研究了复合薄膜的?微观结构, 采用紫外光照射下亚甲基蓝的分解实验比较薄膜的光催化性能. 结果表明: La掺杂可显著提高TiO2-SiO2复合薄膜的光催化活性, 以5%掺杂量为最佳, 其光降解率比掺杂前提高了约23%. 薄膜活性提高的主要原因是La掺杂后细化了TiO2的晶粒, 提高了薄膜的比表面积, 使其具有更高的氧化还原电势, La3+取代Ti4+进入到TiO2晶格, 引起晶格膨胀, 这种不同价离子的取代导致TiO2粒子表面电荷分布不平衡, 从而提高了光生电子-?空穴的分离效率.

关键词: TiO2-SiO2薄膜, La掺杂, 溶胶-凝胶法, 光催化性能

Abstract: La/TiO2-SiO2 thin films were prepared by sol-gel processing. The photocatalysis of the films was characterized by means of photocatalytic degradation of methylene blue under
UV irradiation. The microstructures of prepared films were characterized by using XRD, FE-SEM and AFM analysis. The results show that La3+ doping can
significantly improve the photocatalysis of the composite film. The best proper La doping content is 5%, and the degradation rate of La/TiO2-SiO2
is increased by 23%, higher than that before La doping. The main reason is that La3+ makes TiO2 grain size smaller, which leads to the increase
of the specific area of TiO2, resulting in the higher oxidation-reduction potential of the film. Meanwhile cation vancacies with negative charge are
generated when some La3+ replace Ti4+, which makes TiO2 surface charge out of the balance, and raises separation efficiency of photoelectron--hole
pairs, thus improving the photocatalysis of the composite film.

Key words: La doped, TiO2-SiO2 thin film, sol-gel, photocatalysis

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