电子束辐照降解水中氯霉素的研究

发布时间：2019-07-05 19:01

【摘要】：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.
文内图片：

图片说明：初始浓度对CAP的电子束辐照降解的影响
[Abstract]:In this study, the electron beam irradiation degradation of chloramphenicol (CAP) under different conditions was studied. The results show that electron beam irradiation can effectively remove CAP, low concentration CAP in water under acidic conditions, and the degradation process is in accordance with the quasi-first-order kinetic model. By adding different free radical scavenging agents, it is found that HO plays a key role in the degradation of CAP. In addition, CAP molecules also absorb irradiation and decompose. Both anion and humic acid (HA) in water can inhibit the irradiation degradation of CAP, which is related to the reaction rate constant of HO, and the higher the reaction rate is, the stronger the inhibition ability is. The removal rate of HO in deionized water is higher than that in other actual water bodies, but when the irradiation dose is 4 k Gy, the CAP in sewage filter water and colloid concentrate can also be removed 89.1% and 81.7%, respectively. Six kinds of intermediate products in irradiated solution were detected by GC-MS, which were mainly formed by dehydration, asymmetric central bond breaking and deamides. In addition, Cl-,NO-3 and NO-2 were detected by IC, and TOC decreased to a certain extent, indicating that some CAP were mineralized.
【作者单位】：江西师范大学地理与环境学院鄱阳湖湿地与流域研究教育部重点实验室;复旦大学环境科学与工程系上海市大气颗粒物污染与防治重点实验室;华东师范大学地理科学学院教育部地理信息科学重点实验室;
【基金】：国家自然科学基金(No.41601523,41601521) 江西省自然科学基金(No.20161BAB213079,20161BAB213077) 鄱阳湖湿地与流域研究教育部重点实验室开放基金(No.PK2015006,PK2016006) 江西省教育厅科技计划项目(No.GJJ150307,GJJ160320) 江西师范大学博士启动基金~~
【分类号】：X703

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