论文部分内容阅读
本研究对氯霉素(CAP)在不同条件下的电子束辐照降解进行了研究.结果表明,电子束辐照可有效去除水中CAP,低浓度CAP在酸性条件下的辐照降解更为显著,且降解过程符合准一级动力学模型.通过添加不同的自由基清除剂,发现HO·在CAP降解中起关键作用,此外,CAP分子也会吸收辐照而发生分解.水中共存的阴离子和腐殖酸(HA)对CAP辐照降解均有抑制作用,这跟其与HO·的反应速率常数大小有关,并且反应速率越大,其抑制能力越强.CAP在去离子水中的去除率高于其他实际水体,但辐照剂量为4 k Gy时,污水厂污水过滤水和胶体浓缩液中的CAP也可分别去除89.1%和81.7%.利用GC-MS检测到辐照后溶液中有6种中间产物,主要是通过脱水、不对称中心断键和脱酰胺作用形成.此外,IC检测有Cl-、NO-3和NO-2的产生,并且TOC在一定程度上降低,说明部分CAP被矿化.
In this study, the degradation of chloramphenicol (CAP) by electron beam irradiation under different conditions was studied.The results show that electron beam irradiation can effectively remove CAP in water, and the degradation of CAP at low concentration is more pronounced under acidic conditions , And the degradation process accorded with the quasi-first-order kinetic model.It was found that HO · plays a key role in the degradation of CAP by adding different free radical scavengers.In addition, the CAP molecule also absorbs radiation and decomposes.The co-existing anion and Humic acid (HA) inhibited the degradation of CAP, which was related to its reaction rate constant with HO ·, and the higher the reaction rate, the stronger its inhibitory ability.The removal rate of CAP in deionized water was high In other actual water bodies, CAPs in sewage water and colloidal concentrate were also removed by 89.1% and 81.7%, respectively, at a radiation dose of 4 k Gy. There were 6 The intermediate products were mainly formed by dehydration, asymmetric central bond cleavage and deamidation.In addition, ICs detected the production of Cl-, NO-3 and NO-2, and the TOC decreased to a certain extent, indicating that part of CAP was Mineralization.