采用柠檬酸络合法制备La1-xSrxMnO3(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,原予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La0.9Sr0.1MnO3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后引起的点缺陷一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.
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