纳米 La1－x Srx FeO3粉体制备及光催化降解亚甲基蓝

摘要

The different Sr doping La1 -xSrxFeO3 powders (x=0, 0.2, 0.4, 0.6, 0.8, 1. 0) were prepared by sol -gel method with citric acid as complexing agent .The effect citric acid content , solution pH value , water bath temperature on sol and gel quality of La 1 -x Sr x FeO3 precursor were studied .Meanwhile , the influence of Sr doping amount , calcination temperature , calcination time on photodegradation methylene blue aqueous under irradiation were investigated .The optimized preparation conditions of La 1 -x Srx FeO3 precursor are citric acid and metal ion molar ratio of 2∶1 , the acidic pH solution , and water bath temperature of 50 ℃.The photodegradation rate of La 1-xSrxFeO3 powders was up to 85.8%when Sr doping content was 0.2 calcination temperature was 700 ℃, and calcination time was 2 h.%以柠檬酸为络合剂，采用溶胶凝胶法合成了不同Sr掺杂量的LaFeO3粉体，即La1－xSrxFeO3（x＝0、0．2、0．4、0．6、0．8、1．0）复合氧化物．研究了柠檬酸使用量、溶液的pH值、水浴温度等参数对La1－xSrxFeO3前驱体的溶胶及凝胶质量的影响．同时，以亚甲基蓝水溶液作为目标降解物，研究了Sr的掺杂量、焙烧温度、焙烧时间等因素对La1－xSrxFeO3光催化性能的影响．结果表明，La1－xSrxFeO3前驱体的最佳制备条件为：柠檬酸与金属离子的物质的量比为2∶1、溶液的pH为酸性，水浴温度50℃；且当Sr掺杂量为0．4（摩尔分数）、焙烧温度700℃、焙烧时间2 h条件下制备的粉体具有较好的光催化性能，其降解率高达85．8％．