期刊
WATER RESEARCH
卷 109, 期 -, 页码 266-273出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.watres.2016.11.049
关键词
Acetaminophen; Photodegradation; Oxygen; Triplet states organic matter
资金
- National Science Foundation of China [21577178, 21377030]
- Guangdong Natural Science Funds for Distinguished Young Scholar [2015A030306017]
- Science and Technology Planning Project of Guangdong Province [2014A020216010]
The photolysis of acetaminophen, a widely used pharmaceutical, in simulated natural organic matter solutions was investigated. The triplet states of natural organic matter ((NOM)-N-3*) were found to play the dominant role in its photodegradation, while the contributions from hydroxyl radicals and singlet oxygen were negligible. Dissolved oxygen (DO) plays a dual role. From anaerobic to microaerobic (0.5 mg/L DO) conditions, the degradation rate of acetaminophen increased by 4 fold. That suggests the involvement of DO in reactions with the degradation intermediates. With increasing oxygen levels to saturated conditions (26 mg/L DO), the degradation rate became slower, mainly due to DO's quenching effect on 3NOM*. Superoxide radical (O-2 center dot(-)) did not react with acetaminophen directly, but possibly quenched the intermediates to reverse the degradation process. The main photochemical pathways were shown to involve phenoxyl radical and N-radical cations, finally yielding hydroxylated derivatives, dimers and nitrosophenol. A reaction mechanism involving 3NOM*, oxygen and O-2 center dot(-) is proposed. (C) 2016 Elsevier Ltd. All rights reserved.
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