Degradation of sulfanilamide in aqueous solution by ionizing radiation: Performance and mechanism

文献类型： 外文期刊

第一作者： Yao, Bin

作者： Yao, Bin;Qin, Tian;Zhou, Yaoyu;Zhao, Caifeng;Zhou, Yaoyu

作者机构：

关键词： Sulfanilamide; Antibiotics; Ionizing irradiation; Toxicity; Mineralization

期刊名称：ENVIRONMENTAL POLLUTION （ 影响因子：8.9； 五年影响因子：9.5 ）

ISSN： 0269-7491

年卷期： 2023 年 338 卷

页码：

收录情况： SCI

摘要： Sulfonamide (SA) is an emerging contaminants and the efficient treatment of SA containing wastewater remains a challenge. Herein, SA degradation by gamma irradiation has been systematacially studied. SA (10 mg/L) could be totally removed with 1.5 kGy irradiation. Quenching experiments demonstrated that center dot OH and eaq- were the predominant for SA degradation. SA degradation was reduced with initial concentration increasing, and the removal was faster with pH increasing in the range of 3.1-10.8. The coexisting matters affected SA degradation through changing reactive species, and the introduction of SO42-and Cl- enhanced SA degradation, while CO32had a negative impact on SA degradation, and the degradation was insignificantly affected when adding humic acid. Gamma irradiation could remain effective in real water matrixes. In conjunction with LC-MS analysis and DFT calculation, possible degradation pathways for SA were proposed. Gamma irradiation could reduce the toxicity of SA, while several byproducts with more toxic were also formed. Furthermore, gamma/priodate (PI) process was promising to enhance SA degradation and mineralization. k value increased by 1.85 times, and mineralization rate increased from 19.51% to 79.19% when adding PI. This study suggested that ionizing radiation was efficient to eliminate SA in wastewater.

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