钙钛矿型CaxSr1-xFeO3的光催化活性研究

首先利用柠檬酸溶胶-凝胶法制备了钙钛矿型化合物SrFeO3纳米晶及其掺杂产物粉末,然后利用差热分析找出前驱体干凝胶的灰化温度和焙烧温度分别为400、700℃,利用XRD、TEM等检测手段对催化剂晶体进行了表征。结果表明,柠檬酸溶胶-凝胶法制备的SrFeO3复合氧化物的粒径50～70 nm,属于纳米级;利用紫外-可见光分光光度计测定了SrFeO3对亚甲基蓝溶液的催化性能,发现Ca的掺杂能够明显提高催化剂的催化性能,并得到Ca掺杂5%时（摩尔分数）的催化性能最佳。

Study on Photocatalytic Activity of the Perovskite Type CaXSr1-xFeO3

SrFeO3 perovskite complex oxides nano-crystal together with a series of another multi-component perovskites by partial substitution of cations in position A with Ca were prepared first from the Sol-Gel method using the critic acid.The temperature of firing bulk-gel was determined by TGA.The XRD method was used to carried out the characterization of powders and determine the grain size.The result showed that the prepared catalysts were perovskite structure and the result of TEM showed that the grain sizes of the powders were between 50～70 nm.During the study of the UV-VIS spectrums,we found Sr1-xCaxFeO3 particles had a better photo-catalytic activity than the pure SrFeO3 particles in the solution of methylene blue.At last we obtained Sro.95Ca0.5FeO3 that is the best composition of the semiconductor catalyst.