铕、铈、钇离子对TiO_2催化剂的改性作用  

Photocatalytic Behavior of TiO_2 Doped with Eu,Ce,Y Ions

作　　者：张俊平[1] 王艳[1] 戚慧心[1] 

机构地区：[1]北京师范大学化学系,北京100875

出　　处：《中国稀土学报》2002年第5期478-480,共3页Journal of the Chinese Society of Rare Earths

基　　金：教育部博士点基金资助项目 ( 1990 0 2 715 )

摘　　要：用浸渍法在微米级TiO2 中添加Eu ,Y ,Ce离子 ,研究了其对微米级TiO2 的改性作用。并以DBS的光降解反应为实验模型 ,比较催化剂的催化活性。与未加修饰的微米级TiO2 相比 ,自制的Y/TiO2 ,Ce/TiO2The composite oxide catalysts Eu/TiO_2, Ce/TiO_2, Y/TiO_2 were prepared by impregnation method and characterized by means of TEM and BET. Be a model reaction, the photocatalytic degradation of DBS was investigated in TiO_2, Eu/TiO_2, Ce/TiO_2, Y/TiO_2 powder suspensions irradiated by high-pressure mercury lamp. Photocatalytic degradation efficiency of different catalysts was evaluated by the first-order kinetic constant. The results indicate that the size of TiO_2 has different effect on the photocatalytic behavior of TiO_2 doped with Eu, Ce, Y ions. The catalytic activity of micron scale TiO_2 increases 136 percent and 59 percent owning to doping Y and Ce respectively, while the catalytic activity of nanoscale TiO_2 decreases due to doping Y and Ce.

关 键 词：TIO2 催化剂 改性 稀土 二氧化钛 铕 钇 铈 光催化活性 

分 类 号：O643.36[理学—物理化学]