Journal
JOURNAL OF ENVIRONMENTAL SCIENCES
Volume 54, Issue -, Pages 231-238Publisher
SCIENCE PRESS
DOI: 10.1016/j.jes.2016.02.001
Keywords
Debromination; Brominated aromatics; UV/sulfite process; Hydrated electron; Mechanism
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Funding
- National Natural Science Foundation of China [21307057]
- Natural Science Foundation ofJiangsu Province [BK20130577]
- Specialized Research Fund for the Doctoral Program of Higher Education of China (SRFDP) [20130091120014]
- Fundamental Research Funds for the Central Universities [20620140128]
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Halogenated aromatic compounds have attracted increasing concerns due to their toxicity and persistency in the environment, and dehalogenation is one of the promising treatment and detoxification methods. Herein, we systematically studied the debromination efficiency and mechanism of para-bromophenol (4-BP) by a recently developed UV/sulfite process. 4-BP underwent rapid degradation with the kinetics accelerated with the increasing sulfite concentration, pH (6.1-10) and temperature, whereas inhibited by dissolved oxygen and organic solvents. The apparent activation energy was estimated to be 27.8 kJ/mol. The degradation mechanism and pathways of 4-BP were explored by employing N2O and nitrate as the electron scavengers and liquid chromatography/mass spectrometry to identify the intermediates. 4-BP degradation proceeded via at least two pathways including direct photolysis and hydrated electron-induced debromination. The contributions of both pathways were distinguished by quantifying the quantum yields of 4-BP via direct photolysis and hydrated electron production in the system. 4-BP could be readily completely debrominated with all the substituted Br released as Br, and the degradation pathways were also proposed. This study would shed new light on the efficient dehalogenation of brominated aromatics by using the UV/sulfite process. (C) 2016 The Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences. Published by Elsevier E.V.
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