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Impact of humic acid on the degradation of levofloxacin by aqueous permanganate: Kinetics and mechanism
Xu, Ke; Ben, Weiwei; Ling, Wencui; Zhang, Yu; Qu, Jiuhui; Qiang, Zhimin
2017-10-15
Source PublicationWATER RESEARCH
Volume123Issue:0Pages:67-74
AbstractLevofloxacin (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.
Department环境水质学国家重点实验室
KeywordPermanganate Levofloxacin Humic Acid Hydroxyl Radical Water Treatment
Document Type期刊论文
Identifierhttps://ir.rcees.ac.cn/handle/311016/39516
Collection环境水质学国家重点实验室
Recommended Citation
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.
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