DOI: 10.1016/j.watres.2018.06.026
Scopus记录号: 2-s2.0-85049331781
论文题名: Quinone group enhances the degradation of levofloxacin by aqueous permanganate: Kinetics and mechanism
作者: Xu K. ; Dong H. ; Li M. ; Qiang Z.
刊名: Water Research
ISSN: 431354
出版年: 2018
卷: 143 起始页码: 109
结束页码: 116
语种: 英语
英文关键词: Levofloxacin
; Mn(III)
; Permanganate
; Quinone group
; Singlet oxygen
; Water treatment
Scopus关键词: Biological materials
; Byproducts
; Chemicals removal (water treatment)
; Dissolved oxygen
; Ketones
; Manganese removal (water treatment)
; Rate constants
; Water treatment
; Degradation by-products
; Levofloxacin
; Natural organic matters
; Organic micro-pollutants
; Permanganate
; Pseudo first order rate constants
; Quinone groups
; Singlet oxygen
; Manganese compounds
; benzoquinone
; levofloxacin
; manganese
; natural organic matter
; oxidizing agent
; permanganate
; phenol
; quinone derivative
; unclassified drug
; antibiotics
; aqueous solution
; degradation
; dissolved oxygen
; humic acid
; ketone
; manganese
; organic matter
; oxygen
; reaction kinetics
; water treatment
; Article
; degradation
; electron spin resonance
; pH
; priority journal
; reaction analysis
; water treatment
; Kobus
英文摘要: Quinone group is an important fraction of humic acid. The pseudo-first-order rate constant (kobs) of levofloxacin (LF) degradation by permanganate (MnO4 −) significantly increased from 0.010 (without benzoquinone, BQ) to 0.042–0.443 min−1 at [BQ]o:[MnO4 −]o (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 (1O2) and superoxide radical (O2 [rad]−) 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 O2 [rad]− by BQ, 1O2 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. © 2018 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/112586
Appears in Collections: 气候减缓与适应
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作者单位: Key Laboratory of Drinking Water Science and Technology, Research Center for Eco-Environmental Sciences, University of Chinese Academy of Sciences, Chinese Academy of Sciences, 18 Shuang-qing Road, Beijing, 100085, China
Recommended Citation:
Xu K.,Dong H.,Li M.,et al. Quinone group enhances the degradation of levofloxacin by aqueous permanganate: Kinetics and mechanism[J]. Water Research,2018-01-01,143