中文摘要：

采用溶胶-凝胶法制备 Ce 掺杂 TiO2（Ce-TiO2）纳米颗粒,借助 XRD、XPS、UV-Vis、DRS 等手段对催化剂的结构和理化性质进行分析表征,并以酸性红染料作为模型污染物,考察 Ce-TiO2在可见光作用下的催化活性。实验结果表明,在 CeO2和 TiO2界面形成了Ce-O-Ti键,从而抑制了催化剂的晶化和相转变过程,并在 TiO2的禁带中引入了 Ce4f 掺杂能级。Ce-TiO2在可见光区具有显著吸收,且光生载流子的复合受到有效抑制,因此,Ce 掺杂明显提高了TiO2降解污染物的效率。当 Ce 掺杂量为20%（摩尔分数）,煅烧温度为400℃时,催化剂的活性达到最佳。

英文摘要：

Ce-doped TiO2 nanoparticles were prepared by sol-gel method.The structure and physicochemical properties of the catalysts were investigated by means of XRD,FT-IR,XPS,UV-Vis DRS,etc.The photocat-alytic activities of Ce-doped TiO2 were evaluated by the degradation of acid red under visible light irradiation. The experiment results show that Ce-O-Ti bonds are formed on the interface of cerium oxide and TiO2 ,so that the crystallization and phase transition processes of the catalyst are impeded.Ce-TiO2 has a significant ab-sorption in the visible region and the recombination of the photo-generated electron and hole pairs was greatly inhibited.Hence,the visible-light-driven photocatalytic efficiency of Ce-TiO2 was significantly enhanced.The catalyst doped with 20% Ce presents the best activity when calcinated at 400 ℃.