采用溶胶-凝胶-浸渍法制备了锐钛矿型SO42 /TiO2纳米光催化剂,并通过X射线衍射(XRD)、BET比表面积测量和透射电镜(TEM)对其进行了表征.以对苯二甲酸作为探针分子,结合化学荧光技术研究了光催化剂表面羟基自由基的生成；在紫外和可见光的照射下,以甲基橙为光催化反应的模型化合物,研究了锐钛矿型SO42 /TiO2纳米光催化剂的光催化活性.结果表明:SO42-负载使锐钛矿TiO2的比表面积增加,吸附量增加,光催化活性提高；SO42-/TiO2纳米光催化剂的羟基自由基的生成速率越大,催化剂的催化活性越高；浸渍液H2SO4的浓度对SO42-/TiO2纳米光催化剂的吸附量、羟基自由基的生成速率和催化活性有一定的影响,H2SO4的最佳浓度为0.2 mol/L.
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