文献类型：期刊文献

英文题名：Insight into Fe-O-Bi electron migration channel in MIL-53(Fe)/Bi4O5I2 Z-scheme heterojunction for efficient photocatalytic decontamination

作者：Song, Yanyu[1];Sun, Xianbo[1];Nghiem, Long D.[2];Duan, Jun[3];Liu, Wen[4];Liu, Yongdi[1];Cai, Zhengqing[1,5]

机构：[1]East China Univ Sci & Technol, Natl Engn Res Ctr Ind Wastewater Detoxicat & Resou, Shanghai 200237, Peoples R China;[2]Univ Technol Sydney, Ctr Technol Water & Wastewater, Sch Civil & Environm Engn, Ultimo, NSW 2007, Australia;[3]Purdue Univ, Dept Agron, W Lafayette, IN 47907 USA;[4]Peking Univ, Coll Environm Sci & Engn, Key Lab Water & Sediment Sci, Minist Educ, Beijing 100871, Peoples R China;[5]Shanghai Inst Pollut Control & Ecol Secur, Shanghai 200237, Peoples R China

年份：2024

卷号：667

起止页码：321

外文期刊名：JOURNAL OF COLLOID AND INTERFACE SCIENCE

收录：;EI(收录号：20241615942372);WOS:【SCI-EXPANDED(收录号:WOS:001325698400001)】；

基金：This study was financially supported by the National Natural Science Foundation of China (22176061, 41807340) , Natural Science Founda-tion of Shanghai [21ZR1415600] , and the Science and Technology Commission of Shanghai Municipality (21230712000) .

语种：英文

外文关键词：Z -scheme heterojunction; Electronic migration channel; Photocatalysis; Fluoroquinolones; Structure-rate relationship

摘要：Building a heterojunction is a fascinating option to guarantee sufficient carrier separation and transfer efficiency, but the mechanism of charge migration at the heterojunction interface has not been thoroughly studied. Herein, MIL-53(Fe)/Bi4O5I2 photocatalyst with a Z-scheme heterojunction structure is constructed, which achieves efficient photocatalytic decontamination under solar light. Driven by the newly-built internal electric field (IEF), the formation of Fe-O-Bi electron migration channel allows for rapid separation and transfer of charge carriers at the heterojunction interface, confirmed by the material characterization and density functional theory (DFT) calculation. The narrower band gap and improved visible light response also contribute to the enhanced photocatalytic activity of composite materials. With levofloxacin as the target pollutant, the optimal MIL-53(Fe)/ Bi4O5I2 achieves complete removal of pollutant within 150 min, the photocatalysis rate of which is ca. 4.4 and 26.0 times that of pure Bi4O5I2 and MIL-53(Fe), respectively. Simultaneously, the optimal composite material exhibits satisfactory photodegradation of seven fluoroquinolones, and the photocatalysis rates are as follows: lomefloxacin > ciprofloxacin > enrofloxacin > norfloxacin > pefloxacin > levofloxacin > marbofloxacin. DFT calculations reveal a positive relationship between degradation rate and Fukui index (& fnof;0) of main carbon atoms in seven fluoroquinolones. This study sheds light on the existence of electron migration channels at Z-scheme heterojunction interface to ensure sufficient photoinduced carrier transfer, and reveals the influence of pollutant structure on photolysis rate.