期刊
CHEMOSPHERE
卷 187, 期 -, 页码 268-276出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.chemosphere.2017.08.085
关键词
Flocculants; Acrylamide; UV/chlorination; Hydroxyl radicals; Water treatment
资金
- Natural Science Foundation of China [51478323, 51778444>]
- National Major Science and Technology Project of China [2017ZX07207004]
- State key Laboratory of Pollution Control and Resource Reuse Foundation [PCRRK16005]
- Ministry of Science and Technology, Taiwan [MOST-104-2221-E-327-001-MY3]
The degradation of acrylamide (AA) during UV/chlorine advanced oxidation process (AOP) was investigated in this study. The degradation of AA was negligible during UV irradiation alone. However, AA could be effectively degraded and mineralized during UV/chlorination due to the generation of hydroxyl radicals ((OH)-O-center dot). The degradation kinetics of AA during UV/chlorination fitted the pseudo-first order kinetics with the rate constant between AA and (OH)-O-center dot radicals being determined as 2.11 x 10(9) M-1 s(-1). The degradation rate and mineralization of AA during UV/chlorination were significantly promoted at acidic conditions as well as increasing chlorine dosage. The volatile degradation products of AA during UV/chlorination were identified using gas chromatography-mass spectrometry and the degradation pathways were then proposed accordingly. The formation of disinfection by-products (DBPs) in Milli-Q water and tap water during UV/chlorination of AA was also investigated. The DBPs included chloroform, dichloroacetonitrile, trichloroacetonitrile, 2,2-dichloroacetamide and 2,2,2-trichloroacetamide. Furthermore, the variations of AA degradation during UV/chlorination in different real water samples were evaluated. (C) 2017 Elsevier Ltd. All rights reserved.
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