(廣西師范大學(xué) 環(huán)境與資源學(xué)院，巖溶生態(tài)與環(huán)境變化研究廣西高校重點實驗室，珍稀瀕危動植物生態(tài)與環(huán)境保護(hù)教育部重點實驗室，桂林 541004)
摘 要: 以四氯化錫(SnCl4？5H2O)、錫酸鉍(Bi(NO3)3？5H2O)、檸檬酸(C6H8O7)為主要原料，通過控制水解步驟，采用水熱法合成具有快速吸附-高效降解有機(jī)污染物的層片狀球形BiOCl/Bi2Sn2O7復(fù)相光催化材料。采用X射線衍射(XRD)、掃描電鏡(SEM)及自由基淬滅等技術(shù)對復(fù)相光催化材料樣品的晶相、形貌、光催化活性物種等結(jié)構(gòu)與性質(zhì)進(jìn)行表征。結(jié)果表明：以20 mg/L RhB為目標(biāo)降解物、光催化粉體樣品添加量為0.1 g/L時，在可見光激發(fā)下, 光照8 min后，RhB的降解率達(dá)99.7%；重復(fù)使用14次后，其降解率仍可達(dá)到99%，樣品具有優(yōu)秀的光催化性能。此外，光催化過程中自由基淬滅的反應(yīng)證明，超氧自由基是起關(guān)鍵作用的中間反應(yīng)活性物種。
關(guān)鍵字: BiOCl/Bi2Sn2O7；可見光催化；水熱合成；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-
