物理化学学报2025，Vol.41Issue(9)：119-134,16.DOI:10.1016/j.actphy.2025.100105
S型异质结g-C3N4/Bi2WO6高效降解左氧氟沙星:性能、机理及降解路径
S-scheme heterojunction g-C3N4/Bi2WO6 highly efficient degradation of levofloxacin:performance,mechanism and degradation pathway
摘要
Abstract
g-C3N4/Bi2WO6(MCN/BWO)heterojunction photocatalysts were synthesized via a one-step hydrothermal method for the degradation of levofloxacin(LEV).Under simulated sunlight irradiation,the degradation rate of LEV by MCN/BWO with a molar ratio of 1:1 reached 98.14%,which was attributed to the formation of an S-scheme heterojunction between MCN and BWO.In situ XPS analysis and surface work function measurements confirmed that the electron transfer pathway follows the S-scheme heterojunction mechanism.The internal electric field(IEF)generated by the S-scheme heterojunction in the MCN/BWO system facilitates direct transfer of photogenerated electrons(e-)from the conduction band(CB)of BWO to the valence band(VB)of MCN.This process enables efficient separation of photogenerated electron-hole(e--h+)pairs,with h⁺ accumulating on the VB of BWO and e-accumulating on the CB of MCN.Free radical trapping experiments demonstrated that the superoxide free radical(·O₂-)and h⁺ were the primary active species.Besides exhibiting superior photocatalytic performance,the catalyst maintained excellent stability over three consecutive cycles.To elucidate the degradation mechanism,liquid chromatography-mass spectrometry(LC-MS)and quantitative structure-activity relationship(QSAR)analysis were employed to identify degradation pathways,intermediates,and potential toxicity.This study provides a theoretical foundation for wastewater treatment applications.关键词
S型异质结/MCN/BWO/光催化/左氧氟沙星/降解路径Key words
S-scheme heterojunction/MCN/BWO/Photocatalysis/Levofloxacin/Degradation pathway分类
化学化工引用本文复制引用
韦梦兰,欧晓霞,王艺濛,张梦圆,滕飞,王凯旋..S型异质结g-C3N4/Bi2WO6高效降解左氧氟沙星:性能、机理及降解路径[J].物理化学学报,2025,41(9):119-134,16.基金项目
This work was supported by the Liaoning Provincial Science and Technology Program Joint Plan(2023JH2/101800001),the Basic Scientific Research Fund of Liaoning Provincial Education Department(LJKMZ20220396),and Dalian Science and Technology Talents Innovation Support Program(2024RQ056). 辽宁省科技计划联合项目(2023JH2/101800001),辽宁省教育厅基础科研基金(LJKMZ20220396)以及大连市科技人才创新支持政策实施计划(2024RQ056)资助 （2023JH2/101800001）
