TiO_2光催化剂非金属阴离子修饰的研究进展

Research Progress in Modification of TiO_2 by Non-metal Anions

与以往研究较系统的通过具有高的(光)化学氧化还原活性的修饰剂改性相比,化学相对惰性的非金属阴离子的改性到近来才引起人们的重视,但对其研究还是零散的、不系统的,有时甚至是矛盾的。介绍了非金属阴离子(如F-、PO43-、SO42-等)改性TiO2的制备方法、对光催化效率和机理的影响等,重点阐述了TiO2表面吸附的非金属阴离子在光催化过程中的作用机理的研究进展,并着重强调它们在光催化过程中的共性作用,指出了需要进一步研究的方向。

Compared with the modification of TiO2 by redox active modifier, which has been investigated exten- sively, the modification of TiO2 by nonmetal inert anions is a highlight of recent research. However, the studies on this subject are scattered and unsystematic, and some conclusions are contradictory sometimes. The aim of this paper is to review the recent work on the modification of TiO2 by nonmetal anions（such as F-, PO4^3- , and SO4^2- ）. The modification methods,and effects of the modification on the photocatalytic efficiencies and mechanism are introduced. The emphasis is laid on the mechanism underlying the effect of anionic surface modification of TiO2 on its photocatalytic ac- tivity, in an effort to emphasize their common mechanistic characteristics. The problems deserved to be investigated further are also included.