采用溶胶-凝胶法制备不同Pt掺杂比例的Pt-TiO2光催化剂.通过XRD、XPS、UV-vis表征光催化剂结构,在紫外光及可见光下考察其对NOx的光催化氧化活性.结果表明,所制备的Pt-TiO2均为锐钛矿相,对NOx有明显的可见光降解效果,并且以Pt/Ti比为0.4％时,其光催化活性最高.与P25及TiO2相比,Pt-TiO2在紫外光及可见光下的光催化活性均有较大提高,其NO转化率明显提高,NO2选择性生成率明显降低,归因于Pt的掺杂引入了杂质能级并促进了催化剂的光生电子-空穴对的分离.
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