西玛津的电子束辐照降解

doi:10.12066/j.issn.1007-2861.1945

摘要/Abstract

摘要：

西玛津是一种被广泛使用的三嗪类除草剂, 对人体存在毒性作用. 西玛津在地表水中被检测出, 因此有必要去除水体中的西玛津. 由于传统方法难以将西玛津的三嗪环打开, 因而无法矿化. 采用电子束辐照技术降解西玛津, 结果显示 1 mg/L 西玛津溶液在 4 kGy 剂量辐照后的降解率高达 99.0%, 表明电子束可以有效降解西玛津, 并且降解符合一级动力学. 酸性条件(pH=5)和 2 mmol/L H$_{2}$O$_{2}$ 均极大促进西玛津的降解, 自由基淬灭剂对西玛津降解的影响和降解过程中产生的离子浓度的变化, 表明羟基和水合电子在西玛津降解过程中发挥重要作用. 结合液相色谱质谱检测到的产物, 提出可能的降解路径.

关键词: 西玛津, 电子束, 羟基, 水合电子, 降解机理

Abstract:

Simazine as a widely used triazine herbicide is toxic to human body and is detected in surface water. It is necessary to remove Simazine. Traditional methods cannot break the triazine ring of Simazine and therefore cannot mineralize Simazine. Electron beam was used to degrade Simazine. The results show that degradation rate of 1 mg/L Simazine reaches 99.0% under 4 kGy irradiation. This indicates that electron beam can effectively remove Simazine according to the first order kinetics. Acidic condition (pH=5) and 2 mmol/L H$_2$O$_2$ can greatly promote degradation. The effects of different radical scavengerson degradation and concentration variation of ions produced in the degradation process indicate that both hydroxyl and hydrated electrons are important in the process. A possible degradation path is proposed in combination with the products detected with LC-MS/MS.

Key words: Simazine, electron beam, hydroxyl radical, hydrated electron, decomposition mechanism

中图分类号:

X786

毛雯, 吴明红, 彭诚, 程航, 徐刚. 西玛津的电子束辐照降解[J]. 上海大学学报(自然科学版), 2019, 25(6): 924-932.

Wen MAO, Minghong WU, Cheng PENG, Hang CHENG, Gang XU. Degradation of Simazine in aqueous solution by electron beam[J]. Journal of Shanghai University（Natural Science Edition）, 2019, 25(6): 924-932.

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