可见光/棓酸协同Fe3+活化高碘酸盐降解磺胺嘧啶

梁卉; 晏彩霞; 张悦; 陈雅冰; 丁明军; 王鹏; 聂明华

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中国环境科学 ›› 2025, Vol. 45 ›› Issue (5) : 2827-2838.

新污染物

可见光/棓酸协同Fe³⁺活化高碘酸盐降解磺胺嘧啶

梁卉, 晏彩霞, 张悦, 陈雅冰, 丁明军, 王鹏, 聂明华

作者信息 +

Promoted degradation of sulfadiazine in Fe³⁺/periodate system with the assistant of visible light coupled with 3,4,5-trihydroxybenzoic acid

LIANG Hui, YAN Cai-xia, ZHANG Yue, CHEN Ya-bing, DING Ming-jun, WANG Peng, NIE Ming-hua

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摘要

针对目前Fe²⁺/高碘酸盐(PI)体系难以持续有效,且仅适用于酸性条件的缺陷,开发了可见光(VL)和棓酸(TA)协同Fe³⁺活化PI体系.结果表明,VL联合TA可加速Fe³⁺/Fe²⁺之间的循环,显著增强活化PI的性能.VL/TA/Fe³⁺/PI体系在30min内可实现磺胺嘧啶(SD)的完全降解,且在中性和酸性条件下效果更优.水中常见阴离子如Cl^-、NO₃^-和SO₄^2-对体系降解SD影响较小,但HCO₃^-的存在显著抑制了SD的去除,而腐殖酸(HA)则表现出促进作用.通过淬灭实验及电子顺磁共振分析,发现羟基自由基(HO·)和单线态氧(¹O₂)是体系中降解SD的主要活性物种.基于质谱分析鉴定出的6种降解中间产物,提出了SD三种可能降解路径.以萝卜作为毒性评估模式植物,表明SD污染水体经体系修复后的毒性显著降低.同时,体系在不同实际水体中均表现出优异的处理效能.此外,体系对天然水体中普遍存在的多种典型新污染物都具有良好的降解效果,展示出广阔的应用前景.

Abstract

In response to the current limitations of the Fe²⁺/periodate (PI) system, which is difficult to sustain effective performance and is merely applicable under acidic conditions, a system of visible light (VL) and 3,4,5-Trihydroxybenzoic acid (TA) cooperating with Fe³⁺ for activating PI was constructed. The results indicate that the combination of VL and TA can accelerate the redox cycling between Fe³⁺/Fe²⁺, significantly enhancing the performance of activating PI. The VL/TA/Fe³⁺/PI system can achieve the complete degradation of sulfadiazine (SD) within 30min, with better efficacy under neutral and acidic conditions. Anions such as Cl^-, NO₃^-, and SO₄^2- have minimal effects on SD removal, whereas the existence of HCO₃^- significantly inhibits SD elimination. At the same time, humic acid (HA) exhibits a promoting effect. Quenching tests and electron paramagnetic resonance (EPR) analysis confirmed that hydroxyl radicals (HO·) and singlet oxygen (¹O₂) were the primary reactive species responsible for SD removal. Based on mass spectrometry analysis, 6degradation intermediates were verified, and 3 possible degradation pathways for SD were proposed. Using radish as a model organism for phytotoxicity assessment, it was demonstrated that the toxicity of SD-contaminated water was significantly reduced after treatment. Simultaneously, the system exhibited excellent treatment efficiency in various real water matrices. Furthermore, this system exhibits favourable degradation performance for multiple typical emerging contaminants prevalently existing in natural water bodies, indicating broad application prospects.

导出引用

梁卉, 晏彩霞, 张悦, 陈雅冰, 丁明军, 王鹏, 聂明华. 可见光/棓酸协同Fe³⁺活化高碘酸盐降解磺胺嘧啶[J]. 中国环境科学. 2025, 45(5): 2827-2838

LIANG Hui, YAN Cai-xia, ZHANG Yue, CHEN Ya-bing, DING Ming-jun, WANG Peng, NIE Ming-hua. Promoted degradation of sulfadiazine in Fe³⁺/periodate system with the assistant of visible light coupled with 3,4,5-trihydroxybenzoic acid[J]. China Environmental Science. 2025, 45(5): 2827-2838

中图分类号： X52

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