TiO2光催化剂失活机理研究进展

评述了TiO₂多相光催化剂在处理环境污染物领域的催化剂失活研究进展,主要探讨了气固多相光催化反应过程影响催化剂活性的因素,液固多 相光催化反应的催化剂失活的几种途径,以及解决催化剂失活问题的办法,最后对该领域的研究提出建议.

Progress in Deactivation of Titanium Oxide Photocatalyst

Titanium oxide photocatalysis is a potential technology for environmental purification, but catalysts deactivation occurred during photocatalytic reaction. In this paper, recent advances of deactivation for the titanium oxide photocatalyst in environmental pollution control processes have been summarized. The mechanisms of deactivation in gas-solid and liquid-solid reaction are discussed in detail. The effects of water on photoactivity for titanium oxide gas-solid reaction are presented. Adsorption of some non-degraded compounds on surface of TiO 2 and structures of special surface of TiO 2 altered by some intermediates are the most reasons for deactivation processes. Electrons and holes or the hydroxyl radical captured will give the lower apparent photoactivity of the reaction. Factors which have different effects on deactivation process are discussed also.