杂多酸(盐)掺杂TiO_2制备新型复合光催化剂的研究进展

Progress in Research on Polyoxometalates-Anatase TiO_2 Composite Photocatalyst

TiO2光催化剂由于具有光催化能力强、降解彻底、无二次污染等优点,在污染物降解方面发挥着重要的作用,近年来杂多酸(盐)掺杂TiO2复合光催化剂更是由于其优异性能而得到日益广泛的关注。介绍了常用的杂多酸种类,阐述了杂多酸(盐)掺杂TiO2进行光催化降解有机物的过程及原理,即杂多酸(盐)可以捕获TiO2在光催化下产生的电子,使载流子扩散长度增大,延长电子和空穴的寿命,抑制电子空穴的复合等。同时介绍了目前常用的溶胶-凝胶法、浸渍法、离子交换法、水热合成等掺杂方法,讨论了各种因素如杂多酸(盐)浓度、有机物的浓度、材料的结构等对复合催化剂光催化活性的影响因素,并展望了今后的发展趋势。

Due to its high photocatatysis ability, total degradation and no secondary pollution, TiO2 plays an important role in photocatalysis filed. Especially, in recent years, polyoxometalates-anatase TiO2 composite photocatalyst have received considerable attention due to its excellent performance in photocatalysis. In the review, the kinds of common polyoxometalates are introduced and the photocatalysis process and mechanism of polyoxomeatalates anatase TiO2 composites are analyzed. Polyoxometalates can act as electron scavengers of TiO2, then the recombination rate of electron-holes greatly decreases. Doped methods such as sol-gel process and dipping method are introduced. The influences of experimental factors on the photocatalysis activity, such as the concentration of HPA （POMs） and organic pollutants, the structure of TiO2 and HPA, are also discussed. The trend of this technology is predicted and some problems to be solved are also pointed out.