摘要
以溶胶-凝胶法制备了分别用稀土元素Er3+-Ce3+、La3+-Fe3+复合掺杂的纳米TiO2薄膜,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。通过XRD、SEM和UV-Vis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,稀土元素共掺杂制备的TiO2薄膜最佳热处理温度为550℃,结晶完整、主晶相为锐钛矿型;掺杂可使TiO2薄膜吸收带发生红移,光催化性能增强;复合掺杂体系的最佳量为n(Er)∶n(TiO2)=0.1%,n(Ce)∶n(TiO2)=0.05%;n(La)∶n(TiO2)=0.05%,n(Fe)∶n(TiO2)=0.5%。其中Er3+-Ce3+复合掺杂的纳米TiO2薄膜对亚甲基蓝有较好的降解效果,反应2 h降解率达到83.75%,优于同等条件下制备的La3+-Fe3+和未掺杂的纯TiO2薄膜。
A series of nanometer TiO2 films co-doped respectively by rare earth ions with Er^3＋ -Ce^3＋ and La^3＋ -Fe^3＋ were prepared by Sol-gel method and the photocatalytic activity under ultra-violet light was evaluated by photocatalytic degradation of methyl blue. The properties like crystallographic forms, particles size, and morphology were characterized by the testing techniques such as XRD and TEM. The results show that the optimum heated temperature of co-doped TiO2 was at 550 ℃ and the co-doped TiO2 kept anatase. The co-doping caused red-shift of the UV-Vis absorption spectra and enhanced the absorption of light. Optimal co-doping amount for Er^3＋ -Ce^3＋ was n（Er^3＋ ） ： n （TiO2） = 0.1%, n （Ce^3＋ ） ： n （TiC）z） = 0.05% and La^3＋ - Fe^3＋ was n（La^3＋ ）：n （TiO2） = 0.05%, n （Fe^3＋ ） ： n （TiO2） = 0.5%. Under the condition the photocatalysis properties of TiO2 can be enhanced. It was found that the catalytic activity correlated well with the ratio. The degradation rate of methyl blue examined at two hour of the Er-Ce co-doped films was 83.75 %. It shows that photocatalysis properties are better than the undoped TiO2 and La-Fe films.
出处
《武汉理工大学学报》
CAS
CSCD
北大核心
2009年第11期36-40,共5页
Journal of Wuhan University of Technology
基金
国家科技支撑计划项目(2008B06)
