(1. 山东理工大学 材料科学与工程学院，淄博 255049；
2. 山东理工大学 测试中心，淄博 255049)
摘 要:
关键字: 钙钛矿；柠檬酸络合；Sr掺杂；光催化
（1. College of Materials Science and Engineering, Shandong University of Technology, Zibo 255049, China;
2. Center of Testing, Shandong University of Technology, Zibo 255049, China）
Abstract:Nanophotocatalysts La1−xSrxMnO3 (x=0, 0.05, 0.1, 0.3, 0.5) were prepared by citric acid complexometry. In order to obtain physicochemical properties and microstructure, these powders were characterized by XRD, UV-vis and SEM. The photocatalytic activities of these powders in the methylene blue were studied. The results show that these catalysts are cubic and Sr substitutes for La to diminish the crystal cell. The distortion of lattice is caused. The photoabsorption edges have obvious red shift after doping Sr2+. Sr2+ optimal doping amount is 0.1, and La0.9Sr0.1MnO3 photocatalysis is well dispersed and the size is narrow. The photodegradation rate irradiated for 150 min reaches 67.1% when La0.9Sr0.1MnO3 serves as the photocatalyst, which exceeds 32.2% when LaMnO3 uses as the catalyst. The improvement of photocatalytic activity could be mainly attributed to the increase of the point defect, i.e, the oxygen vacancy concentration results from the Sr2+ doping.
Key words: perovskite; citric acid complex; Sr doped; photocatalysis
