中文摘要：

从光吸收过程、表面态光生载流子的俘获和光催化量子效率方面详细地阐述了光催化机理，并概述了TiO2系光催化剂在环境物质净化处理和太阳能转换利用等。最后总结了TiO2系光催化剂的研究现状，如掺杂改性、合成介孔尺度的纳米结构TiO2等。

英文摘要：

The photocatalysis is illustrated in detail from the viewpoint of the optical absorption, the trapping of photoinduced carriers and the quantum efficiency, and the applications of the TiO2 photocatalysts in polluted water or air cleaning and solar energy conversion are summarized. Finally,the current researches with respect to the TiO2 photocatalysis are summed up. Recently, the doped and photocatalysts with nano structure have been studied extensively.