采用4种方法制备LaFeO3催化剂,探讨制备方法对LaFeO3催化剂结构和性能的影响.用XRD、UV-Vis DRS、PL和SEM等手段对样品进行表征.以罗丹明B为目标降解物,考察催化剂的可见光光催化活性.研究结果表明:这4种方法均能制备单一的钙钛矿型LaFeO3催化剂,其中,共沉淀法制备的催化剂具有最大的晶粒尺寸,最小的比表面积,仅为0.4 m2/g,显示出最强的光催化活性;在可见光照射下反应140 min,罗丹明B的脱色率达到53.6%.柠檬酸络合法制备的催化剂的比表面积最大,为8.1 m2/g,但其脱色率仅为9.0%.由此可推断,小的颗粒和高的比表面积并不是总有利于催化剂的光催化活性,大的晶粒和规整的表面形貌等对催化活性也具有决定性的影响.
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