S型异质结 高效降解左氧氟沙星：性能、机理及降解路径

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Abstract： g-C3N4/Bi2WO6（MCN/BWO） heterojunction photocatalystsweresynthesizedviaaone-stephydrothermal 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 workfunction measurements confirmedthatthe 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 directtransferof 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 （⋅02-） and h+ were the primary active species. Besides exhibiting superior photocatalytic performance， the catalyst maintainedexcelent stabity overthree consecutive cycles.Toelucidatethe degradation mechanism，liquid chromatography-mass spectrometry （LC-MS）andquantitative structure-activity relationship （QSAR）analysis were employedtoidentifydegradationpathways，intermediates，andpotentialtoxicity.Thisstudyprovidesatheoretical foundation forwastewater treatment applications.

Key Words：S-scheme heterojunction; MCN/BWO; Photocatalysis;Levofloxacin; Degradation pathway

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）。（剩余27996字）