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

引用本文: 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): 100105. doi: 10.1016/j.actphy.2025.100105 shu

Citation: Menglan Wei, Xiaoxia Ou, Yimeng Wang, Mengyuan Zhang, Fei Teng, Kaixuan Wang. S-scheme heterojunction g-C₃N₄/Bi₂WO₆ highly efficient degradation of levofloxacin: performance, mechanism and degradation pathway[J]. Acta Physico-Chimica Sinica, 2025, 41(9): 100105. doi: 10.1016/j.actphy.2025.100105 shu

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

大连民族大学环境与资源学院, 辽宁大连 116600

通讯作者: 欧晓霞, ouxiaoxia@dlnu.edu.cn

基金项目:
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

大连市科技人才创新支持政策实施计划 2024RQ056

摘要: 采用一步水热法合成了g-C₃N₄/Bi₂WO₆(MCN/BWO)异质结光催化剂，用于降解左氧氟沙星(LEV)。在模拟太阳光照射下，摩尔比为1 : 1的MCN/BWO对LEV的降解率达到98.14%，这归因于MCN和BWO之间形成了S型异质结。原位XPS分析和表面功函数测量证实了电子转移路径遵循S型异质结机制。MCN/BWO体系中S型异质结产生的内建电场(IEF)促进了光生电子(e⁻)从BWO的导带(CB)直接转移到MCN的价带(VB)。这一过程实现了光生电子-空穴对(e⁻-h⁺)的有效分离，h⁺在BWO的VB上积累，e⁻在MCN的CB上积累。自由基捕获实验表明，超氧自由基(·O₂⁻)和h⁺是主要的活性物种。除了表现出优异的光催化性能外，该催化剂在连续三个循环中保持了良好的稳定性。为了阐明降解机制，采用液相色谱-质谱(LC-MS)和定量构效关系(QSAR)分析来鉴定降解途径、中间产物和潜在毒性。本研究为废水处理应用提供了理论基础。

关键词:

English

S-scheme heterojunction g-C₃N₄/Bi₂WO₆ highly efficient degradation of levofloxacin: performance, mechanism and degradation pathway

College of Environment and Resources, Dalian Minzu University, Dalian 116600, Liaoning Province, China

Corresponding author: Xiaoxia Ou, Email: ouxiaoxia@dlnu.edu.cn

Received Date: 05 March 2025
Accepted Date: 12 May 2025
Revised Date: 09 May 2025
Available Online: 15 September 2025
Fund Project:
the Liaoning Provincial Science and Technology Program Joint Plan

the Basic Scientific Research Fund of Liaoning Provincial Education Department

Dalian Science and Technology Talents Innovation Support Program

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.

Key words:

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沈阳化工大学材料科学与工程学院沈阳 110142

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

通讯作者: 欧晓霞, ouxiaoxia@dlnu.edu.cn

English

S-scheme heterojunction g-C₃N₄/Bi₂WO₆ highly efficient degradation of levofloxacin: performance, mechanism and degradation pathway

Corresponding author: Xiaoxia Ou, Email: ouxiaoxia@dlnu.edu.cn

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