介孔LaCoO_3催化剂的制备及其光催化性能

Preparation and photocatalytic properties of mesoporous LaCoO_3 catalysts

以SBA-15为模板剂,采用纳米铸型法制备具有高比表面积的有序介孔钙钛矿型氧化物LaCoO_3催化剂,通过XRD、N2吸附-脱附和H2-TPR等对催化剂进行表征,并与溶胶-凝胶法制备的LaCoO_3催化剂比较,研究其光催化降解亚甲基蓝的性能。结果表明,纳米铸型法制备的立方晶系钙钛矿型LaCoO_3催化剂的比表面积为84 m2·g-1,对100 mg·L-1亚甲基蓝降解率达71.60%,远优于溶胶-凝胶法制备的LaCoO_3催化剂。

Ordered mesoporous perovskite-type oxide LaCoO3 with high specific surface area was synthesized via nanocasting method by using SBA-15 as the template. The catalyst was characterized by XRD,N2 adsorption-desorption and H2-TPR techniques,and its catalytic activity was tested for photocatalytic degradation of MB. Compared with LaCoO3 prepared by sol-gel method,the cubic crystal perovskite-type LaCoO3 from the nanocasting method shows high activity for the degradation of MB. The degradation rate of 100 mg·L-1 MB is 71. 60%,which might be related to the high specific surface area of 84 m2·g-1.