TiO2光催化剂的改性研究进展

 TiO₂光催化剂具有禁带宽度较大、光生电子-空穴易复合等缺点,因而国内外关于TiO₂光催化剂的改性研究很多。本文综述了贵金属沉积、元素掺杂(金属离子掺杂、非金属掺杂、共掺杂)、复合半导体、表面光敏化、表面酸化等TiO₂光催化剂改性方法及原理。其中,非金属掺杂和共掺杂改性可使TiO₂光响应波长红移,同时保留TiO₂对紫外光的响应,从而实现良好的处理效果叠加。最后展望了TiO₂光催化剂改性研究的未来研究方向,即兼顾生产成本,保持TiO₂在复杂环境下的稳定性,并提高其回收利用率。

Review on the Modification of TiO2 Photocatalyst

TiO₂ photocatalyst has some disadvantages, such as wider band gap, high electron-hole recombination rate, etc. Therefore, a lot of research work focused on the modification of TiO₂ photocatalyst has been carried out at home and aboard. Some modification methods of TiO₂ photocatalyst, e.g. noble metal deposition, element doping (metal ion doping, non-metal doping, and co-doping), compound semiconductor, photosensitization, and surface acidification, as well as their mechanisms are summarized. Among them, the response wavelength of TiO₂ shows a red-shift after non-metal doping or co-doping, at the meanwhile, UV response of TiO₂ is preserved, therefore, the superimposition of good process effect is realized. The future direction of photocatalytic study is looked into, giving consideration to the production cast, keeping the stability of TiO₂ in complex environment, and increasing recovery rate of TiO₂.