摘要
采用溶胶-凝胶法制备了Er-Ce共掺杂的TiO2纳米粉体，并以亚甲基蓝溶液为目标降解物研究了掺杂纳米TiO2粉体在紫外光作用下的光吸收和光催化性能。采用TG-DTA、XRD和TEM等测试技术对样品的晶型、形貌和粒径尺寸进行了表征。结果表明，Er-Ce共掺杂的TiO2粉体最佳热处理温度为550℃，结晶完整、主晶相为锐钛矿型，平均粒径约为20nm；掺杂可使TiO2吸收带发生红移，光催化性能增强；共掺杂体系的最佳量为n（Er）：n（TiO2）=0．1％，n（Ce）：n（TiO2）=0．05％。此掺杂量的TiO2粉体对亚甲基蓝有良好的降解效果，反应2h降解效果达到92．37％，优于同等条件下制备的未掺杂的纯TiO2粉体。掺杂复合光催化剂对亚甲基蓝的降解遵循一级动力学方程。
Nano-TiO2 co-doped with Er-Ce was prepared by sol-gel method and the photocatalystic activity under ultra-violet light was evaluated by photocatalytic degradation of methyl blue.The crystallographic forms, particles size, and morphology were characterized by the testing techniques such as XRD,TG-DTA and TEM. The results show that the optimum heated temperature of Er-Ce co-doped TiO2 was at 550℃ and the co-doped TiO2 kept anatase. The anatase crystal had the average size of 20 nm. The co-doping caused red-shift of the UV-Vis absorption spectra and enhanced the absorption of light. Optimal co-doping amount for Er-Ce was n（Er） ： n（TiO2）= 0.1%, n（Ce） ： n（TiO2）=0.05%, and under the condition the photocatalysis properties of TiO2 can be enhanced. The degradation rate of methyl blue examined at two hour of the reaction was 92.37%. It is showed that the better photocatalysis properties than the undoped TiO2.The co-doped photocatalyst on methyl blue degradation coincide first order dynamic equation.
出处
《功能材料》
EI
CAS
CSCD
北大核心
2007年第A07期2428-2432,共5页
Journal of Functional Materials
基金
山东铝业公司资助项目（2004005）
