uvpms体系中氟甲喹的降解动力学及机理研究(附件)
目录
摘要 1
关键词 1
Abstract 1
引言
引言
1 材料与方法 2
1.1 试剂 2
1.2 实验方法 3
1.1.1 不同水基质中氟甲喹反应体系的制备 3
1.1.2 氟甲喹光降解实验 3
1.3 分析方法 3
1.3.1 HPLC分析 3
1.3.2 LC/MSMS分析 3
2 结果与分析 4
2.1 氟甲喹在超纯水中降解的动力学分析 4
2.1.1 PMS浓度的影响 4
2.1.2 腐殖酸的影响 4
2.1.3 初始pH值的影响 5
2.1.4 水体中常见阴、阳离子的影响 6
2.2 FLU在自然水体和合成水中的降解 8
2.3 系统自由基的鉴定 9
2.4 反应机理 11
3 讨论 12
3.1 UV/PMS体系对FLU的降解效果 12
3.2 反应条件对FLU降解效果的影响 12< *景先生毕设|www.jxszl.com +Q: ¥351916072¥
br /> 3.3 FLU在不同水基质中的降解情况 12
3.4 FLU在UV/PMS体系中降解的反应路径推断 13
致谢 13
参考文献 13
UV/PMS体系中氟甲喹的降解动力学及机理研究
Degradation of flumequine in aqueous by UVactivated peroxymonosulfate:
Kinetics, products and reaction mechanisms
Student majoring in Agricultural Resources and Environment Yumeng Qi
Tutor Yangchun Xu
Abstract: The degradation of flumequine (FLU) in aqueous by ultraviolet (UV)activated peroxymonosulfate (PMS) was investigated in this work. The effects of operating parameters ( the oxidant doses, pH, the presence of typical anions and cations (NH4+、Mg2+、Fe3+、Cl、NO3、HCO3) and humic acid ) were evaluated. The degradation coefficients of FLU in different water matrices (Synthetic wastewater, Tap water, Ultrapure water, Jiuxiang river water, Secondary effluent water) were also explored. It was found that an increase of the PMS and the presence of Mg2+ could accelerate the reaction, while HA, HCO3− and Fe3+ (0.5mM) inhibited the reaction. The degradation constants of FLU were obviously accelerated in strong acid or alkali conditions. The order for FLU removal in various water matrices was as follows: Synthetic wastewater > Tap water > Ultrapure water > Jiuxiang river water > Secondary effluent water. The results of ethanol and tertbutanol effects showed that SO4 and HOall existed in this reaction system.
Key words: flumequine;UV/PMS;degradation kinetics;reaction pathways
引言
氟喹诺酮类抗生素被广泛用于治疗人类和动物的细菌感染,它们进入人或动物体内后40%至90%以母体或代谢物的形式随粪便或尿液进入环境[13]。氟甲喹(FLU)是一种典型的氟喹诺酮类抗生素(图1),该药物已被广泛应用于家禽、家畜和水产养殖行业。传统的废水处理方法不足以完全去除FLU,其在水体环境中的残余浓度可达2.5 50 ng L1[45]。然而,环境中残留的抗生素对人体健康以及整个生态系统存在潜在危害,比如容易引起毒性损伤、过敏反应、三致作用(致癌、致畸、致突变)等,破坏生态平衡,威胁生物多样性[6,38,39]。抗生素的环境污染及其生态毒理效应已成为我国乃至全球所面临的重大环境问题之一[6]。
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