中文摘要：

研究了避光、可见光照及紫外光照条件和TiO2对酒石酸还原Cr（Ⅵ）的催化作用及其作用机制。结果表明：（1）避光条件下，酒石酸对Cr（Ⅵ）的还原作用很微弱，外加TiO2对该反应也仅有微小变化。TiO2对酒石酸还原Cr（Ⅵ）的催化作用只有在光照下才能产生。紫外光照下，仅酒石酸存在时，150min后Cr（Ⅵ）即被反应完全，外加TiO2催化7min后Cr（Ⅵ）即被反应完全。（2）光照能诱导并加速酒石酸还原Cr（Ⅵ）的光催化作用，紫外光照下的光催化还原反应速率远快于可见光照。（3）pH对TiO2光催化酒石酸还原Cr（Ⅵ）的反应速率有明显的影响，pH越小，光催化还原反应速率越快。（4）酒石酸初始浓度的增大有利于Cr（Ⅵ）光催化还原。

英文摘要：

Series of photocatalytic experiments were conducted on Cr（Ⅵ ） solution with tartaric acid as reductant and TiO2 as photocatalyst, the effect of pH, TiO2, irradiation and initial tartaric acid concentration on photocatalytic experiments were investigated,and the mechanism of Cr（ Ⅵ） reduction was analyzed. The results showed that single tartaric acid had little capability for Cr（ Ⅵ） reduction and the adsorption of Cr（ Ⅵ ） on TiO2 could also be ignored. The acid condition was benefit for Cr（Ⅵ） reduction,when the pH was 3.00,Cr（ Ⅵ ） was decreased to 63% of initial Cr（ Ⅵ） concentration with the visible light irradiation for 8 h,with the UV irradiation only in 80 min, Cr（Ⅵ） was decreased to 44% of initial Cr（Ⅵ） concentration. The presence of TiO2 could increased the Cr（Ⅵ） reduction either in visible light irradiation or UV irradiation. The reduction rate of Cr（ Ⅵ） was increased with increasing the initial tartaric acid concentration,when the initial tartaric acid concentration was 1 000 μmol/L and pH was 4.00,more than 99% of Cr（ Ⅵ） was reduced in 7 min.