钙钛矿型光催化剂LaAlO3制备及光催化性能研究

Study on Synthesis and Photocatalytic Performance of Perovskite-type LaAlO3

采用柠檬酸溶胶-凝胶法制备了钙钛矿型LaAlO3催化剂,利用激光粒度分布仪、扫描电子显微镜、X射线粉末衍射仪等对催化剂的粒径大小及形貌特征进行了表征;以富里酸作为典型污染物,研究紫外光照射下LaAlO3对该污染物的降解性能,考察不同反应条件污染物的去除效果及催化剂的再生性能。结果表明,自制催化剂平均粒径为0.1883 mm,颗粒表面呈多孔状,结晶度高且较为纯净。催化剂投加量0.3 g/L、曝气量0.8 L/min且紫外灯功率30W为优化反应条件。在该条件下反应240 min后,UV254、TOC去除率分别为98.7%、38.9%;LaAlO3催化降解罗丹明B和亚甲基蓝溶液模拟废水,染料脱色率分别达到95.04%和71.45%。

The perovskite-type LaAlO3 catalysts was synthesized via a citric acid sol-gel method.The particle size and the morphology of the catalyst were characterized by laser particle size distribution analyzer,scanning electron microscope and X-ray powder diffractometer.With fulvic acid as the indicated pollutant,the catalytic performance of LaAlO3 under ultraviolet light was studied by analyzing the removal efficiency and the catalyst recovery performance under different reaction conditions.The results indicated that the average particle size of the catalyst was 0.1883 mm,the particle surface was porous,the crystallinity was high,and the particle was relatively pure.The optimal reaction condition was with the catalyst dosage of 0.3 g/L,aeration rate of0.8 L/min and the light intensity of 30 W.After 240 min of reaction under the optimal condition,the removal rates of UV254 and TOC reached 98.7%and38.9%,and the decolorization rates of rhodamine B and methylene blue in the simulated wastewater reached 95.04%and 71.45%,respectively.