| 陈婧妍,侯杰,潘文姣,唐伟豪,李英杰.化学通报,2026,89(6):743-750. |
| 卤素离子对磺胺甲氧基哒嗪光降解的影响机制 |
| Mechanistic Effects of Halide Ions on the Photodegradation of Sulfamethoxypyridazine |
| 投稿时间：2026-03-07 修订日期：2026-04-10 |
| DOI： |
| 中文关键词: 磺胺甲氧基哒嗪 卤素自由基 激发三重态 协同作用 |
| 英文关键词:Sulfamethoxypyridazine halogen radicals triplet excited state synergistic effect |
| 基金项目: |
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| 中文摘要: |
| 磺胺甲氧基哒嗪(SMP)在高盐水体中频繁检出,其光化学归趋及卤素离子效应尚不清楚。本研究在模拟太阳光下考察卤素离子对SMP光降解动力学与机理的影响。结果表明,SMP在纯水中发生直接光解,Cl?显著促进降解,Cl?/Br?共存体系中呈现协同增强。自由基淬灭实验发现,SMP的直接光降解由激发三重态(3SMP*)主导；含卤素体系中,3SMP*氧化卤素离子生成活性卤素物种(RHS),氯溴自由基(BrCl??)为关键活性物种。UPLC-QTOF-MS初步鉴定出4种主要降解产物,降解路径包括SO2光致脱除的重排路径与活性自由基驱动的S-N键断裂路径。研究结果揭示了环境背景卤素离子对SMP光化学归趋的显著调控作用,为评估磺胺类抗生素在河口水环境中的光降解与环境风险提供机制依据。 |
| 英文摘要: |
| Sulfamethoxypyridazine (SMP) is frequently detected in high-salinity waters, yet its photochemical fate and the roles of halide ions remain unclear. Here, we investigated the effects of halide ions on the photodegradation kinetics and mechanism of SMP under simulated solar irradiation. SMP underwent direct photolysis in pure water; the presence of Cl? markedly enhanced its degradation, and a pronounced synergistic enhancement was observed in the combined Cl?/Br? system. Radical quenching experiments indicated that direct photodegradation of SMP is dominated by its triplet excited state (3SMP*). In halide-containing systems, 3SMP* oxidizes halide ions to generate reactive halogen species (RHS), with the bromochlorine radical (BrCl??) identified as a key reactive species. UPLC–QTOF–MS preliminarily identified four major transformation products, suggesting two primary pathways: a rearrangement route initiated by SO2 photoextrusion and an S–N bond cleavage route driven by reactive radicals. Overall, these results demonstrate that background halide ions can significantly regulate the photochemical fate of SMP, providing mechanistic evidence for assessing the photodegradation and potential environmental risks of sulfonamide antibiotics in estuarine waters. |
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