【作者】 王志义； 管相杰； 邓先功；

【Author】 WANG Zhi-yi GUAN Xiang-jie DENG Xian-gong (College of Materials Science and Engineering,Qingdao University of Science and Technology,Qingdao 266042,China)

【机构】 青岛科技大学材料科学与工程学院；

【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．更多还原

【Abstract】 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 rutile 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℃.更多还原