研究了几种不同粒径的TiO2在CH3CCH和H2O的光催化反应中的催化活性. 结果表明,利用离子注入法可以拓展纳米TiO2催化剂的光吸收区域,使其吸收带向可见光方向偏移,且偏移程度随着TiO2粒径的增大而增大; 特别是注入V离子使TiO2催化剂在可见光区域具有光催化活性. V离子注入后,TiO2催化剂在紫外区域的光催化活性没有下降,但在可见光区域的光催化活性有所提高. 在五种光催化剂中,具有中等粒径大小的P-25注入V离子后表现出最高的光催化活性. 在太阳光直接照射下,这些光催化剂也具有较高的催化活性.
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