摘要
采用溶胶-凝胶法在陶瓷基体上制备了纳米La2O3／TiO2复合薄膜。利用XRD研究了La2O3不同复合量对纳米TiO2晶型转化的影响，利用SEM研究了Al2O3底膜对La2O3／TiO2复合薄膜形貌的影响，利用亚甲基兰溶液紫外光降解实验研究了La2O3／TiO2复合薄膜的光催化性能．结果表明：复合0．5％（物质的量）La2O3的TiO2干凝胶经850℃煅烧后仍为锐钛矿（64％（质量分数））占主导的混晶结构，平均粒径在10nm左右；当Al2O3底膜和La2O3／TiO2复合薄膜的厚度分别为4层和3层时，经850℃煅烧后，复合薄膜致密且无微裂纹出现，而且具有佳的光催化性能．
La2O3/TiO2 nano-composite films dipped on ceramic substrates was prepared using Sol-gel method. The influences of compound quantity of La2O3 on TiO2 phase transition and that of Al2O3 understratum film on La2O3/TiO2 composite thin film morphology were studied using XRD and SEM respectively. The photocatalytic properties of La2O3/TiO2 films was characterized by means of photocatalytic degradation of methylene blue under UV irradiation. Results indicated that TiO2 gel compounded by 0.5%（mol） La2O3 is mixed crystalline structure of anatase and ruffle in which anatase is dominant （64wt%） after calcined at 850℃, and the average particle size of TiO2 is about 10 nm. The composite thin film with 4 layers Al2O3 understratum film and 3 layers La2O3/TiO2 film is more compact and without microcrack, and shows well photocatalytic properties after calcined at 850℃.
出处
《功能材料》
EI
CAS
CSCD
北大核心
2007年第A07期2433-2436,共4页
Journal of Functional Materials
