期刊
CHEMICAL ENGINEERING JOURNAL
卷 292, 期 -, 页码 82-91出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2016.01.009
关键词
Fluoroquinolones; Thermal activation; Kinetics; Sulfate radicals; Mechanism
资金
- National Natural Science Foundation of China [51508354]
- Sichuan Provincial Environmental Protection Office of China [2013HB08]
- Sichuan University [2082604184026, 0030807602026]
Three typical fluoroquinolones (FQs), ciprofloxacin, norfloxacin and enrofloxacin were degraded using the thermal activation of persulfate (PS). The degradation rates of FQs generally increased with the rise of PS/fluoroquinolone ratio (20:1-80:1) and temperature but decreased with the increase of initial pH values. The major degradation mechanisms of fluoroquinolones by thermally activated PS were proposed. Abundant intermediates identified by liquid chromatography-tandem mass spectrometry (LC-MS/MS) indicated that the oxidation would occur mainly on the C-F bonds (for ciprofloxacin and enrofloxacin) or the C-H (for norfloxacin) bonds on the quinolone, groups, causing hydroxyl substitution as well as hydrogen abstraction, and on the piperazine groups following a series of substitutions, additions and eliminations resulting in the final open-loop reactions. (C) 2016 Elsevier B.V. All rights reserved.
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