Quinone group enhances the degradation of levofloxacin by aqueous permanganate: Kinetics and mechanism

CORC > 生态环境研究中心 > 中国科学院生态环境研究中心 > 中国科学院饮用水科学与技术重点实验室

	Quinone group enhances the degradation of levofloxacin by aqueous permanganate: Kinetics and mechanism
	Qiang, Zhimin; Li, Mengkai; Dong, Huiyu; Xu, Ke
刊名	WATER RESEARCH
	2018-10-15
卷号	143 页码:109-116
关键词	Quinone group Permanganate Levofloxacin Mn(III) Singlet oxygen Water treatment
ISSN号	0043-1354
文献子类	Article
英文摘要	Quinone group is an important fraction of humic acid. The pseudo-first-order rate constant (k(obs)) of levofloxacin (LF) degradation by permanganate (MnO4-) significantly increased from 0.010 (without benzoquinone, BQ) to 0.042-0.443 min(-1) at [BQ](0):MnO4-](0) (molar ratio) = 0.03-0.25 at pH 7.5, and an acidic pH facilitated LF degradation. In the presence of BQ MnO4- was first reduced to Mn(II). Then, Mn(II) reacted with BQ to produce Mn(III) and semiquinone radical, which was promoted under acidic conditions. With dissolved oxygen available, Mn(III) further oxidized semiquinone radical to produce singlet oxygen (O-1(2)) and superoxide radical (O-2(center dot-)) as well as regenerate BQ In addition, MnO4- could also react with Mn(II) to produce Mn(III), whose complexation with semiquinone radical in turn promoted this reaction. Due to the predominant scavenging of O-2(center dot-) by BQ O-1(2) and Mn(III) mainly contributed to the accelerated LF degradation, with a notable formation of hydroxyl, ketone and endoperoxide groups in the degradation byproducts. This study helps better understand the role of natural organic matter in the degradation of organic micropollutants by MnO4- in water treatment. (C) 2018 Elsevier Ltd. All rights reserved.
内容类型	期刊论文
源URL	[http://ir.rcees.ac.cn/handle/311016/41407]
专题	生态环境研究中心_中国科学院饮用水科学与技术重点实验室
推荐引用方式 GB/T 7714	Qiang, Zhimin,Li, Mengkai,Dong, Huiyu,et al. Quinone group enhances the degradation of levofloxacin by aqueous permanganate: Kinetics and mechanism[J]. WATER RESEARCH,2018,143:109-116.
APA	Qiang, Zhimin,Li, Mengkai,Dong, Huiyu,&Xu, Ke.(2018).Quinone group enhances the degradation of levofloxacin by aqueous permanganate: Kinetics and mechanism.WATER RESEARCH,143,109-116.
MLA	Qiang, Zhimin,et al."Quinone group enhances the degradation of levofloxacin by aqueous permanganate: Kinetics and mechanism".WATER RESEARCH 143(2018):109-116.