Bi_(2)WO_(6)/BiOI光催化降解水中四环素的性能与机理  

Performance and mechanism of photocatalytic degradation of tetracycline by Bi_(2)WO_(6)/BiOI in water

作　　者：邱璐雯 魏璐英 陈锦琳 郑雪 张宇晴 吕健 QIU Luwen;WEI Luying;CHEN Jinlin;ZHENG Xue;ZHANG Yuqing;LÜJian(Fujian Provincial Key Laboratory of Soil Environmental Health and Regulation,College of Resources and Environment,Fujian Agriculture and Forestry University,Fuzhou 350002;CASTECH INC.,Fuzhou 350003)

机构地区：[1]福建农林大学资源与环境学院,福建省土壤环境健康与调控重点实验室,福州350002 [2]福建福晶科技股份有限公司,福州350003

出　　处：《环境科学学报》2024年第2期83-92,共10页Acta Scientiae Circumstantiae

基　　金：福建农林大学科技创新专项基金(No.CXZX2019073G)。

摘　　要：采用溶剂热法合成Bi_(2)WO_(6)/BiOI(BWO/BOI)复合光催化剂,并将其应用于可见光降解四环素(Tetracycline,TC).结果表明,BWO/BOI复合光催化剂与单一的Bi_(2)WO_(6)相比具有更好的光催化降解TC的性能.其中,结构优化后的BWO/BOI-4在60 min内光催化降解TC的效率达85.8%,其反应速率常数为Bi_(2)WO_(6)的1.7倍、BiOI的7.8倍.且BWO/BOI催化剂可在宽泛的pH范围(2.0~12.0)内保持优异的降解效率.能带结构分析表明,BWO/BOI构成Ⅱ型异质结,更有利于e-和h+的有效分离.通过自由基猝灭实验和电子顺磁共振(EPR)测试发现,在光催化体系中超氧自由基(·O_(2)^(-))是反应的主要活性物种.Bi_(2)WO_(6)/BiOI(BWO/BOI)composite photocatalysts were synthesized by a solvothermal method and employed for the degradation of tetracycline(TC)under visible irradiation.Results showed that BWO/BOI composites exhibited an improved photocatalytic performance for TC degradation in comparison with either a single Bi_(2)WO_(6) or BiOI counterpart.Notably,the BWO/BOI-4 displayed a photocatalytic degradation efficiency of 85.8%in 60 min,with a reaction rate constant 1.7 times that of the Bi_(2)WO_(6) and 7.8 times that of the BiOI.Moreover,the BWO/BOI maintained an excellent degradation efficiency in a wide range of pH(2.0~12.0).Band structure analysis indicated that type II heterojunctions were formed between the Bi_(2)WO_(6) and BiOI,which accounted for effective separation of photoelectrons and holes.Quenching experiments and electron paramagnetic resonance(EPR)tests revealed that superoxide radical(·O_(2)^(-))was the main active species in this photocatalytic system.

关 键 词：钨酸铋 碘氧化铋 四环素 光催化 异质结 

分 类 号：X703[环境科学与工程—环境工程]