纳米TiO_2光催化剂改性与制备的研究进展

Research Progress on the Modification and Preparation of Nano-TiO_2 Photocatalyst

在各种半导体光催化氧化技术中,二氧化钛(TiO_2)氧化能力强、光诱导超亲水性好,具有生物降解无可比拟的降解速度快、无选择性、降解完全等优点,以及无毒无害和长期的光化学稳定性质。着重介绍了旨在拓宽TiO_2光响应范围的掺杂、表面光敏化和半导体复合等改性方法;系统归纳了纳米TiO_2的几种常见的气相和液相制备方法。最后,宏观展望了光催化技术的实用化进程应立足于微观定量动力学机制、多元元素掺杂改性系统工程和大规模低成本先进制备技术等方面。

In a variety of semiconductor photocatalysis, titanium dioxide （TiO2） has good oxidation ability and photoinduced hydrophilicity, with characteristics of fast degradation rate, non-selective feature and complete degradation that the biodegradation does not have. It also has properties of non-toxic and long-term photochemical stability. Modification approaches aiming to broaden the range of TiO2 light response including doping, surface sensitization and semiconductor recombination are emphatically introduced. Several common preparation methods of gas phase and liquid phase are systematically summed up. Finally, microscopic quantitative kinetic mechanism, systematical engineering of multi-element doping modification and large-scale low-cost advanced preparation technology are macroscopically prospected aiming at the practical process of photocatalytic technology.