期刊
JOURNAL OF HAZARDOUS MATERIALS
卷 403, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.jhazmat.2020.123834
关键词
Permanganate; Peroxymonosulfate; Levofloxacin; Manganese dioxide; Benzoquinone activation
资金
- Research and Development Program in Key Areas of Guangdong Province [2019B110205004]
- National Natural Science Foundation of China [21906030, 51979044]
- Guangdong Basic and Applied Basic Research Foundation [2019A1515011947, 2019A15151103321]
- Guangdong Natural Science Funds for Distinguished Young Scholar [2019B151502023]
- Guangzhou Science and technology project [202002030093]
- China Postdoctoral Science Foundation [2019M662814, 2020M672539]
- Guangdong University of Technology One-Hundred Talents Program [220418162]
- Key Special Project for Introduced Talents Team of Southern Marine Science and Engineering Guangdong Laboratory [GML2019ZD0403]
- Guangdong International Training Program for Outstanding Young Talents
The study compared the oxidation of a model fluoroquinolone antibiotic levofloxacin (LEV) by permanganate (Mn(VII)) and peroxymonosulfate (PMS), showing that both oxidants can efficiently eliminate the antibiotic activity of LEV with slightly different mechanisms. Additionally, benzo-quinone was found to have an activating effect on both PMS and Mn(VII) oxidation, although their activation mechanisms were distinct.
Permanganate (Mn(VII)) as a selective oxidant has been widely used in water treatment process. Recently, peroxymonosulfate (PMS) was recognized as an emerging selective oxidant, which showed appreciable reactivity toward organic compounds containing electron-rich functional groups. In this study, the oxidation of a model fluoroquinolone antibiotic levofloxacin (LEV) by Mn(VII) and PMS was comparatively investigated. Degradation of LEV by PMS followed second-order kinetics and showed strong pH dependency with apparent second-order rate constants (k(app)) of 0.15-26.52 M-1 s(-1) at pH 5.0-10.0. Oxidation of LEV by Mn(VII) showed autocatalysis at pH 5.0-7.0, while no autocatalysis was observed at pH 8.0-10.0 (k(app) = 2.23-4.16 M-1 s(-1)). Such unusual oxidation kinetics was attributed to the in-situ formed MnO2 from Mn(VII) consumption. The performance of PMS and Mn(VII) for the degradation of LEV was also examined in real waters. PMS primarily react with the aliphatic N4 amine on the piperazine ring of LEV, and Mn(VII) reacted with both the aliphatic N4 amine and aromatic N1 amine. Both PMS and Mn(VII) could efficiently eliminate the antibiotic activity of LEV. Benzo-quinone showed activating effect on both PMS and Mn(VII) oxidation, but their activation mechanisms were totally different.
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