溶液pH值对锰酸镧粉体光催化性能的影响  

Effect of pH value on photocatalytic property of LaMnO_3 powder

作　　者：李军奇[1] 李伟杰[1] 何选盟[1] 贾鑫蕊 

机构地区：[1]陕西科技大学材料科学与工程学院,陕西西安710021

出　　处：《陕西科技大学学报（自然科学版）》2016年第3期46-50,共5页Journal of Shaanxi University of Science & Technology

基　　金：陕西省科技厅自然科学基金项目(2015JM5213);陕西科技大学学术骨干培育计划项目(XSGP201202)

摘　　要：以柠檬酸为络合剂,采用溶胶-凝胶法合成了锰酸镧钙钛矿型光催化剂,研究了锰酸镧光催化剂在不同pH值溶液中对甲基橙有机污染物的降解效果.利用XRD、SEM、差热分析和紫外可见光谱分析等测试手段对样品的结构和性能进行了表征.结果表明:所制备的锰酸镧粉体在酸性条件下对甲基橙有较强的吸附,达到了45.64%,而碱性条件下基本不吸附,从而导致锰酸镧粉体在酸性条件下对甲基橙有优异的光降解效果(40min,甲基橙脱除率达到了85.71%),但在pH值小于1时,由于甲基橙分子结构变为醌型,降低了锰酸镧粉体对甲基橙的降解效果.The perovskite LaMnO3 （lanthanum manganate）photocatalysts were successfully fabricated via sol-gel method using citric acid as complexing agent.It was also discussed that the degradation rate of methyl orange（MO）under different pH of LaMnO3 photocatalysts. The final structure and properties of the products were characterized by XRD,SEM,TG-DTA and UV-vis spectrum.The results showed that the LaMnO3 photocatalysts exhibited excellent photocatalytic activity for the degradation of MO and the degradation rate for MO was up to 85.71% （40 min）under the acidic environment because of the great absorption of MO which was up to 45.64%.While the MO could not be degraded by the LaMnO3 photo-catalysts under alkaline conditions.But the effect of degradation was reduced when the pH value was less than 1 for that the molecular structure of MO turned into quinoid under this condition.

关 键 词：锰酸镧 PH 光催化 

分 类 号：O64[理学—物理化学]