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无机材料学报

无机材料学报

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采用溶胶-水热法合成掺La的TiO2纳米粒子及其表征

井立强; 孙志华; 王百齐; 屈宜春; 付宏刚   

  1. 黑龙江大学化学化工与材料学院物理化学重点实验室; 哈尔滨 150080
  • 收稿日期:2004-06-25 修回日期:2004-08-17 出版日期:2005-07-20 网络出版日期:2005-07-20

Preparation and Characterization of La Doped TiO2 Nanoparticles by Sol-hydrothermal Method

JING Li-Qiang; SUN Zhi-Hua; WANG Bai-Qi; QU Yi-Chun; FU Hong-Gang   

  1. The Key Laboratory of Physical Chemistry; School of Chemistry and Material Sciences; Heilongjiang University; Harbin 150080; China
  • Received:2004-06-25 Revised:2004-08-17 Published:2005-07-20 Online:2005-07-20

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摘要： 采用溶胶-水热法制备了不同掺杂的二氧化钛纳米粒子,并用表面光电压谱(SPS) 和荧光光谱(PL)等对样品进行了表征,重点考察了La的量和焙烧温度对样品表面光电和光致发光以及光催化活性等的影响,并对它们之间的内在关系进行了探讨.结果表明:在合适的焙烧温度下,适量镧的掺杂能够提高二氧化钛的光催化活性.样品的SPS谱和PL光谱与光催化活性之间存在一定的关系,即SPS和PL信号越强,光生电子和空穴分离效率越高,光催化活性越高.

关键词: TiO2, 溶胶-水热法, La, 掺杂, 光催化

Abstract: TiO2 nanoparticles doped with different content of La were prepared by a sol-hydrothermal method, and also
characterized by surface photovoltage spectroscopy (SPS) and photoluminescence (PL) spectra. The effect of La dopant content and
calcination temperature on surface photoelectrical and photoluminescence performance was investigated, and their inherent relationships
discussed. The results show that an appropriate content of La dopant could effectively enhance the photocatalytic activity of TiO2 calcined at
appropriate temperature. Moreover, there are certain relationships among SPS and PL and the activity, i.e., the stronger the SPS and PL signals,
the larger the separation rate of photoinduced electron-hole pairs, the higher the photocatalytic activity of La doped TiO2 nanoparticles.

Key words: TiO2, sol-hydrothermal method, La, doping, photocatalysis

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