Journal
CHEMOSPHERE
Volume 149, Issue -, Pages 219-223Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.chemosphere.2016.01.108
Keywords
Boron-doped diamond anode; Quinoline; Mineralization; Pathway
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Funding
- Fundamental Research Funds for the Central Universities [2009QH01]
- National High Technology Research and Development Program of China (863 Program) [2015AA050501]
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Boron-doped diamond anodes were selected for quinoline mineralization, and the resulting intermediates, phenylpropyl aldehyde, phenylpropionic acid, and nonanal were identified and followed during quinoline oxidation by gas chromatography-mass spectrometry and high-performance liquid chromatography. The evolutions of formic acid, acetic acid, oxalic acid, NO2-, NO3-, and NH4+ were quantified. A new reaction pathway for quinoline mineralization by boron-doped diamond anodes has been proposed, where the pyridine ring in quinoline is cleaved by a hydroxyl radical giving phenylpropyl aldehyde and NH4+. Phenylpropyl aldehyde is quickly oxidized into phenylpropionic acid, and the benzene ring is cleaved giving nonanal. This is further oxidized to formic acid, acetic acid, and oxalic acid. Finally, these organic intermediates are mineralized to CO2 and H2O. NH4+ is also oxidized to NO2- and on to NO3-. The results will help to gain basic reference for clearing intermediates and their toxicity. (C) 2016 Elsevier Ltd. All rights reserved.
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