收稿日期: 2017-04-09
网络出版日期: 2019-02-26
基金资助
国家自然科学基金资助项目(11675098);国家自然科学基金资助项目(41473090);国家自然科学基金资助项目(41430644);国家自然科学基金资助项目(41373098);长江学者和创新团队发展计划资助项目(IRT13078)
Degradation of sulfamethoxazole in aqueous solution by electron beam
Received date: 2017-04-09
Online published: 2019-02-26
磺胺甲噁唑 (sulfamethoxazole, SMX) 是一种被广泛使用的抗菌类药物. 由于传统的污水处理技术很难有效地降解这类废水, 故对电子束这一新型高级氧化技术对磺胺甲噁唑的处理效果以及 不同影响因素对降解的影响进行了实 验研究. 结果表明, 电子束对于磺胺甲噁唑的降解效果较好, 在辐照剂量为 5 kGy 时, 几种质量百分比的目标物几乎被完全降解. 通过计算可知, 目标物的降解遵循假一级动力学方程; 碱性条件和加入适量的双氧水有利于降解; 羟基自由基和水合电子在电子束的降解中起到重要的作用. 用离子色谱仪和液相色谱质谱联用仪 (liquid chromatography-tandem mass spectrometry, LC-MS-MS) 检测磺胺甲噁唑降解后的中间产物, 并通过中间产物提出可能的降解途径.
袁得宝, 邓飞, 毛雯, 赵涛, 胡冕, 吴明红, 徐刚 . 电子束降解水溶液中磺胺甲噁唑[J]. 上海大学学报(自然科学版), 2019 , 25(1) : 101 -108 . DOI: 10.12066/j.issn.1007-2861.1904
Sulfamethoxazole (SMX) is a widely used antibacterial drug. It is hard to degrade effectively in aqueous solutions in a traditional wastewater treatment process. This study focuses on SMX degradation using an advanced oxidation technique, electron beam radiation, to investigate effects of different factors on degradation. The results show that the degradation rate of electron beam for SMX is high. SMX is almost completely degraded at 5 kGy. Degradation of SMX obeys a pseudo first-order kinetic equation. Alkaline condition and proper amount of H$_2$O$_2$ are beneficial to the degradation. Hydroxyl radical and electron play an important role in the degradation of electron beam. Intermediates can be detected with ion chromatography (IC) and liquid chromatography-tandem mass spectrometry (LC-MS-MS). Several degradation pathways are proposed.
Key words： sulfamethoxazole (SMX); electron beam; intermediate; degradation pathway
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