钙钛矿La1-xSrxMnO3纳米晶光催化活性-有色金属在线

简介概要

钙钛矿La1-xSrxMnO3纳米晶光催化活性

来源期刊：中国有色金属学报2008年第7期

论文作者：董抒华田贵山冯柳

文章页码：1353 - 1353

关键词：钙钛矿；柠檬酸络合；Sr掺杂；光催化

Key words：perovskite; citric acid complex; Sr doped; photocatalysis

摘要：

采用柠檬酸络合法制备La_1-xSr_xMnO₃(x=0, 0.05, 0.1, 0.3, 0.5)纳米光催化剂，应用XRD、UV-vis和SEM等技术表征这些纳米晶的物化性质及微观结构，并研究其对亚甲基蓝紫外光照射降解的光催化活性。结果表明：所得光催化剂为钙钛矿型，均为立方相，原子Sr替代钙钛矿A位La进入晶格中引起晶胞收缩，晶格产生畸变。掺杂Sr后LaMnO₃的吸收带边发生明显的红移。Sr最佳掺杂量x=0.1，所形成的La_0.9Sr_0.1MnO₃光催化剂分散性好、尺寸分布较窄，经150 min光照射后光降解率可达67.1%，比LaMnO₃作为光催化剂提高32.2%。掺杂Sr后引起的点缺陷－氧空位浓度增加是掺杂Sr后的LaMnO₃具有高效光催化活性的主要原因。

Abstract: Nanophotocatalysts La_1-xSr_xMnO₃ (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 La_0.9Sr_0.1MnO₃ photocatalysis is well dispersed and the size is narrow. The photodegradation rate irradiated for 150 min reaches 67.1% when La_0.9Sr_0.1MnO₃ 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.

基金信息：国家高技术研究发展计划资助项目

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