Impact of humic acid on the degradation of levofloxacin by aqueous permanganate: Kinetics and mechanism
文献类型：期刊论文
| 作者 | Xu, Ke; Ben, Weiwei; Ling, Wencui; Zhang, Yu; Qu, Jiuhui; Qiang, Zhimin |
| 刊名 | WATER RESEARCH
 |
| 出版日期 | 2017-10-15 |
| 卷号 | 123期号:0页码:67-74 |
| 关键词 | Permanganate Levofloxacin Humic Acid Hydroxyl Radical Water Treatment |
| 英文摘要 | Levofloxacin (LF) is a frequently detected fluoroquinolone in surface water, and permanganate (MnO4-) is a commonly used oxidant in drinking water treatment. This study investigated the impact of humic acid (HA) on LF degradation by aqueous MnO4- from both kinetic and mechanistic aspects. In the absence of HA, the second-order rate constant (k) of LF degradation by MnO4- was determined to be 3.9 M-1 s(-1) at pH 7.5, which increased with decreasing pH. In the presence of HA, the pseudo-first-order rate constant (k(obs)) of LF degradation at pH 7.5 was significantly increased by 3.8- and 2.8-fold at [HA](o):[KMnO4](o) (mass ratio) = 0.5 and 1, respectively. Secondary oxidant scavenging and electron paramagnetic resonance tests indicated that HA could form a complex with Mn(III), a strongly oxidative intermediate produced in the reaction of MnO4- with HA, to induce the successive formation of superoxide radicals (O-2(center dot-)) and hydroxyl radicals (center dot OH). The resulting center dot OH primarily contributed to the accelerated LF degradation, and the complex [HA-Mn(III)] could account for the rest of acceleration. The degradation of LF and its byproducts during MnO4- oxidation was mainly through hydroxylation, dehydrogenation and carboxylation, and the presence of HA led to a stronger destruction of LF. This study helps better understand the degradation of organic micropollutants by MnO4- in drinking water treatment. (C) 2017 Elsevier Ltd. All rights reserved. |
| 源URL | [http://ir.rcees.ac.cn/handle/311016/39516]  |
| 专题 | 生态环境研究中心_环境水质学国家重点实验室 |
| 推荐引用方式 GB/T 7714 | Xu, Ke,Ben, Weiwei,Ling, Wencui,et al. Impact of humic acid on the degradation of levofloxacin by aqueous permanganate: Kinetics and mechanism[J]. WATER RESEARCH,2017,123(0):67-74. |
| APA | Xu, Ke,Ben, Weiwei,Ling, Wencui,Zhang, Yu,Qu, Jiuhui,&Qiang, Zhimin.(2017).Impact of humic acid on the degradation of levofloxacin by aqueous permanganate: Kinetics and mechanism.WATER RESEARCH,123(0),67-74. |
| MLA | Xu, Ke,et al."Impact of humic acid on the degradation of levofloxacin by aqueous permanganate: Kinetics and mechanism".WATER RESEARCH 123.0(2017):67-74. |
入库方式： OAI收割
来源：生态环境研究中心
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