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
Key Laboratory of Poyang Lake Wetland and Watershed Research, Ministry of Education, Jiangxi Provincial Key Laboratory of Ecological Intelligent Monitoring and Comprehensive Treatment of Watershed, School of Geography and Environment, Jiangxi Normal University, Nanchang 330022, China
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 SO42- 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.
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. CHINA ENVIRONMENTAL SCIENCECE, 2025, 45(5): 2827-2838.
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