摘要
利用水热法制备Bi_(2)WO_(6)/MIL-101(BWO/MIL-101)异质结光催化剂,并研究其在可见光下降解水中四环素(tetracycline;TC)的性能及机理.结果表明,Bi_(2)WO_(6)纳米片在MIL-101载体表面致密生长形成BWO/MIL-101异质结材料后可见光催化TC降解的性能明显提高.其中,结构优化的BWO/MIL-101-40在60min内的TC降解效率为85.9%,其反应速率常数是Bi_(2)WO_(6)的1.4倍,是MIL-101的3.1倍,且BWO/MIL-101在中性及碱性环境中表现出稳定且良好的光催化性能.能带结构分析表明,Bi_(2)WO_(6)/MIL-101构成II型异质结,有效拓宽了可见光响应范围,加快光生载流子的迁移速率,并抑制e−和h^(+)的复合.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)^(-))和空穴(h^(+))是反应的主要活性物种.
The Bi_(2)WO_(6)/MIL-101composite photocatalysts were synthesized via a hydrothermal method to facilitate the degradation of tetracycline(TC)under visible light.Research findings demonstrated that the TC degradation efficiency of Bi_(2)WO_(6) under visible light was significantly enhanced following the dense growth of BWO nanosheets on the surface of MIL-101.Furthermore,the structurally optimized BWO/MIL-101-40exhibited a TC degradation efficiency of 85.9%within 60minutes,with a reaction rate constant approximately 1.4 times that of Bi_(2)WO_(6) and 3.1times that of MIL-101.Additionally,BWO/MIL-101 displayed consistent and robust photocatalytic performance in neutral and alkaline conditions.Band structure analysis revealed the formation of type II heterojunctions between Bi_(2)WO_(6) and MIL-101,contributing to effective photoelectron-hole separation.Quenching experiments and electron paramagnetic resonance(EPR)tests indicated superoxide radical(•O_(2)–)and holes(h^(+))as the primary active species in this particular photocatalytic system.
作者
蔡奉颖
许煜航
龙浩然
袁语馨
张宇晴
何秋香
吕健
CAI Feng-ying;XU Yu-hang;LONG Hao-ran;YUAN Yu-xin;ZHANG Yu-qing;HE Qiu-xiang;LÜJian(College of Resources and Environment,Fujian Agriculture and Forestry University,Fuzhou 350002,China;CASTECH INC,Fuzhou 350003,China)
出处
《中国环境科学》
EI
CAS
CSCD
北大核心
2024年第8期4652-4660,共9页
China Environmental Science
基金
国家自然科学基金资助项目(22371042)
福建省教育厅中青年教师教育科研项目(JAT200090)
福建农林大学创新基金(CXZX2019073G,CXZX2020070A)。
关键词
钨酸铋
金属有机框架
四环素
光催化
异质结
bismuth tungstate
metal-organic framework
tetracycline
photocatalysis
heterojunction
