(广西师范大学 环境与资源学院，岩溶生态与环境变化研究广西高校重点实验室，珍稀濒危动植物生态与环境保护教育部重点实验室，桂林 541004)
摘 要: 以四氯化锡(SnCl4？5H2O)、锡酸铋(Bi(NO3)3？5H2O)、柠檬酸(C6H8O7)为主要原料，通过控制水解步骤，采用水热法合成具有快速吸附-高效降解有机污染物的层片状球形BiOCl/Bi2Sn2O7复相光催化材料。采用X射线衍射(XRD)、扫描电镜(SEM)及自由基淬灭等技术对复相光催化材料样品的晶相、形貌、光催化活性物种等结构与性质进行表征。结果表明：以20 mg/L RhB为目标降解物、光催化粉体样品添加量为0.1 g/L时，在可见光激发下, 光照8 min后，RhB的降解率达99.7%；重复使用14次后，其降解率仍可达到99%，样品具有优秀的光催化性能。此外，光催化过程中自由基淬灭的反应证明，超氧自由基是起关键作用的中间反应活性物种。
关键字: BiOCl/Bi2Sn2O7；可见光催化；水热合成；超氧自由基
（1. College of Resources and Environmental Science, Guangxi Normal University, Guilin 541004, China;
2. University Key Laboratory of Karst Ecology and Environment Change of Guangxi Province, Guangxi Normal University, Guilin 541004, China;
3. Key Laboratory of Ecology of Rare and Endangered Species and Environmental Protection, Ministry of Education, Guilin 541004, China）
Abstract:A novel layered spherical photocatalyst BiOCl/Bi2Sn2O7 with rapid adsorption and high degradation of organic pollutants was synthesized by hydrothermal method using SnCl4？5H2O, Bi(NO3)3？5H2O and C6H8O7 as the main raw materials via controlling the hydrolysis process. XRD, SEM and radical quenching were used to characterize the structure and properties of the synthesized samples. The powder was used as a photocatalyst for degradation of RhB in aqueous solution under visible light. The results show that approximately 99.7% RhB (20 mg/L) is eliminated after 8 min at catalyst dose of 0.1 g/L. The catalyst is found to be reusable. After fourteen successive cycles, the decoloration rate of RhB solution can still reach 99%. The synthesized powder has excellent photocatalytic properties. In addition, the radical quenching reaction in the photocatalytic process indicates that superoxide radical is key intermediate reactive species.
Key words: BiOCl/Bi2Sn2O7; visible light photocatalysis; hydrothermal synthesis; ·O2-
