Photocatalytic degradation and decomposition mechanism of fluoroquinolones norfloxacin over bismuth tungstate: Experiment and mathematic model

[Display omitted] •The norfloxacin degradation was ascribed to photolysis, photocatalysis-via OH, and photocatalysis-via direct h+ oxidation.•Five amide intermediates were resulted from the OH oxidation on the piperazine in FQs.•A mathematical model was successfully built up to predict the intermedi...

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Bibliographic Details
Published in:Applied catalysis. B, Environmental Environmental, 2015-06, Vol.168-169, p.175-182
Main Authors: Chen, Meijuan, Chu, W.
Format: Article
Language:English
Subjects:
Active species
Amides
Bi2WO6
Bismuth
Degradation
Hydroxyl radicals
Mathematical model
Mathematical models
Norfloxacin
Oxidation
Photocatalysis
Radicals
Reaction mechanism
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Summary:[Display omitted] •The norfloxacin degradation was ascribed to photolysis, photocatalysis-via OH, and photocatalysis-via direct h+ oxidation.•Five amide intermediates were resulted from the OH oxidation on the piperazine in FQs.•A mathematical model was successfully built up to predict the intermediates accumulation. Identification the active species and reaction intermediates during the treatment of norfloxacin using Bi2WO6 photocatalysis were investigated in this study. To the best of our knowledge this is the first study on the active species and reaction intermediates for the degradation of any fluoroquinolones (FQs) using Bi2WO6 photocatalysis. The role of active species was determined by the influence of radicals’ scavengers and selected ions. The overall efficiency of Bi2WO6 photocatalysis was ascribed to photolysis, photocatalysis-via hydroxyl radical (OH), and photocatalysis-via direct hole (h+) oxidation, and their contribution was determined to be 15.0, 79.3, and 5.7%, respectively. Fourteen intermediates were identified in the treated samples. Among them, the five amide intermediates in Bi2WO6 photocatalysis were resulted from the OH oxidation on the piperazine in FQs. A reaction formula was developed to describe this reaction where amine translated into amide by the attack of OH radicals. Moreover, a mathematical model was successfully built up to predict the intermediates accumulation as the concentration of initial probe and reaction time is given, which is useful in practical application.
ISSN:0926-3373
1873-3883
DOI:10.1016/j.apcatb.2014.12.023