利用水热法将Bi₂Sn₂O₇纳米颗粒负载到CeO₂微球上制备Z型异质结光催化剂并用于光催化降解水污染物。结果表明,在光照下60min时,优化的Bi₂Sn₂O₇/CeO₂(BSC-5)对盐酸四环素的降解效率达到88.4%(反应速率常数k=0.0334 min^-1),是CeO₂的8.25倍和Bi₂Sn₂O₇的4.71倍。Z型异质结可以形成更多暴露的活性中心,具有更好的光电子-空穴对分离效率、优异的氧化还原能力以及有效产生超氧自由基(·O^-₂)和羟基自由基(·OH)。此外,Bi₂Sn₂O₇/CeO₂在光催化降解实验中表现出良好的稳定性,经过5次循环后降解效率保持在85%以上。同时,在实验研究的基础上阐明了Bi₂Sn₂O₇/CeO₂光催化剂的光催化机理。

Bi₂Sn₂O₇ nanoparticles are loaded onto CeO₂ microspheres via hydrothermal method to produce Z-type heterojunction for photocatalytic degradation of contaminants in water.Results show that the degradation efficiency of tetracycline hydrochloride by the optimized Bi₂Sn₂O₇/CeO₂ (BSC-5) reaches 88.4% after 60 minutes of exposure to light (reaction rate constant k=0.0334 min^-1),which is 8.25 times that over CeO₂ and 4.71 times that over Bi₂Sn₂O₇.Z-type heterojunction can form more exposed active centers,presenting better photoelectron-hole pair separation efficiency and excellent redox ability,and effectively generating superoxide radicals (·O^-₂) and hydroxyl radicals (·OH).In addition,Bi₂Sn₂O₇/CeO₂ shows good stability in photocatalytic degradation experiments,and delivers a degradation efficiency above 85% after 5 cycles.Meanwhile,the photocatalytic mechanism of Bi₂Sn₂O₇/CeO₂ photocatalyst is elucidated on the basis of experimental study.

王妮都(1999-),女,硕士生,研究方向为新能源材料的合成与应用,wangnidu@zjou.edu.cn;杨淑清(1974-),女,博士,副教授,研究方向为离子液体的催化应用以及轻质油品中硫化物的组成结构分析,通讯联系人,ysqjane@163.com。