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采用溶胶-凝胶法制备出纳米X-TiO2(X=Ce,Bi)粉体,并用XRD、UV-Vis DRS对其进行表征,以500W氙灯模拟太阳光,考察改性TiO2粉体的可见光催化活性。采用涂覆法制备出改性TiO2电极,以300 W高压汞灯为侧光源,考察了电极的光电催化性能。实验结果表明:改性TiO2粉体均为锐钛矿型晶相,Ce和Bi的加入不同程度地提高了TiO2在可见光区的吸光强度,Bi和Ce最佳摩尔掺杂量均为0.04%。3种电极光电催化性能先后排序为:TiO2电极<0.04%Bi-TiO2电极<0.04%Ce-TiO2电极,循环伏安曲线分析表明,金属离子的掺杂提高了TiO2电极的电催化活性,且Ce的掺杂对电极电催化活性的影响大于Bi。HPLC分析表明,金属离子掺杂使得苯环开环加速,促进了苯酚的氧化过程。
X-ray diffraction (X = Ce, Bi) powders were prepared by sol-gel method and characterized by XRD and UV-Vis DRS. The solar cells were simulated with 500 W xenon lamp. active. The modified TiO2 electrode was prepared by coating method. The photoelectrocatalytic performance of the electrode was investigated by using a 300 W high pressure mercury lamp as side light source. The experimental results show that all the modified TiO2 powders are anatase crystal phases, and the addition of Ce and Bi increases the absorption of TiO2 in the visible region to a certain extent. The optimum molar doping amount of Bi and Ce is 0.04%. The results of cyclic voltammetry showed that the doping of metal ions increased the electrocatalytic activity of the TiO2 electrode, and the electrocatalytic activity of Ce Of the doping on the electrode electrocatalytic activity than Bi. HPLC analysis showed that the doping of metal ions accelerated the ring opening of the benzene ring and promoted the oxidation of phenol.