稀土-金属共掺杂纳米TiO_2的制备及其光催化性能  

Preparation and Photocatalytic Properties of RE-metal Co-doped TiO_2 Nanoparticles

作　　者：尹荔松[1] 朱剑[1] 闻立时[1] 杨硕[1] 谢琦谞[1] 

机构地区：[1]中南大学物理科学与技术学院,长沙410083

出　　处：《世界科技研究与发展》2008年第2期122-125,共4页World Sci-Tech R&D

基　　金：中国博士后基金资助项目(20060390878);湖南省博士后基金资助项目(2007RS4024)

摘　　要：采用溶胶-凝胶法制备了稀土La3+、Ce3+单掺杂及La-Fe、Ce-Fe共掺杂TiO2光催化剂,利用XRD、FE-SEM等手段对样品的结构、形貌进行了表征。以甲基橙为光催化反应模型化合物,考察了掺杂对光催化活性的影响。实验结果表明:稀土-金属掺杂抑制了TiO2锐钛矿相向金红石相的转变,抑制了纳米晶体的生长。掺杂后TiO2光催化剂的光催化性能有明显提高,共掺杂TiO2光催化剂产生了协同效应,其光催化性能优于单掺杂样品,以La0·5%-Fe0·05%共掺杂效果最佳。The RE single doped and co-doped TiO2 were prepared by sol-gel method,the structure and shape were characterized by XRD,FE-SEM. The photocatalytic activities were evaluated by degradation of methyl orange. The results show that the co-doping with optimum RE and metal can restrain the transform of anatase structure to rutile structure and the growth of crystal,improve the photocatalytic efficiency. The co-doping of RE and metal show a synergistic effect for photocatalytic activity of TiO2. The co-doped TiO2 show higher photocatalytic activity in degradation of methyl orange than that of single doped TiO2. Titania co-doped with La-Fe for n（La）：n（TiO2）=0.5%,n（Fe）：n（TiO2）=0.05% have the highest photocatalytic efficiency.

关 键 词：二氧化钛 共掺杂 光催化 协同效应 

分 类 号：O614.411[理学—无机化学]