在紫外光照射下 ,使用不同TiO2 作催化剂 ,对Cr(VI)的光还原反应进行研究 ,研究结果表明 :当溶液pH值为 1 .0及 2 .0时 ,Cr(VI)光还原显示 0 .5级反应动力学 ,而当溶液pH值为 4 .0时 ,Cr(VI)光还原表现为 1级反应动力学。添加不同的催化剂 ,Cr(VI)光还原动力学不发生变化。使用不同温度下焙烧的TiO2作催化剂 ,显示了不同的催化性能 ,4 0 0°C焙烧的TiO2 具有最佳的催化活性 The photocatalytic reduction reaction of Cr (VI) with different TiO2 as catalyst was studied under ultraviolet light irradiation. The results showed that the photocatalytic reduction of Cr (VI) showed that when the solution pH was 1.0 and 2.0 .5 order reaction kinetics, and when the solution pH value is 4.0, Cr (VI) photoreduction showed a first order reaction kinetics. Adding different catalysts, Cr (VI) photoreduction kinetics does not change. The photocatalytic activity of TiO2 calcined at different temperatures shows different catalytic properties. The calcined TiO2 at 400 ℃ has the best catalytic activity