期刊
CHEMOSPHERE
卷 149, 期 -, 页码 76-83出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.chemosphere.2016.01.097
关键词
Benzophenone-4; Ozonation; Intermediate products; Degradation pathways; Toxicity; Frontier electron density
资金
- National Natural Science Foundation of China [21377051, 21407061, 21577063]
- Major Science and Technology Program for Water Pollution Control and Treatment of China [2012ZX07506-001]
- Planned Science and Technology Project of Jiaxing [2014AY21013]
The occurrence of benzophenone-4 (BP-4) in water environments may pose a serious public health hazard due to its potential endocrine disrupting effects. In this work, the intermediates, probable degradation pathways and toxicity changes during ozonation of BP-4 in aqueous solution were systematically investigated. Results revealed that alkaline conditions favored the oxidation of BP-4. However, inorganic anions (Cl-, NO3-, SO42-), cations (K+, Ca2+, Mg2+) and humic acid had no remarkable effect on BP-4 removal within the tested concentrations. Ozonation was also effective for the fast removal of BP-4 in real waters. The TOC suggested a low mineralization rate, even after the complete BP-4 removal. Meanwhile, the treated mixtures exhibited an obvious inhibition to the bioluminescent bacteria Photobacterium phosphoreum, indicating the formation of transformation products with higher toxicities. Furthermore, fourteen products were identified by means of liquid chromatography-mass spectrometry. Notably, seven of them have not been reported previously. The quenching test indicated that the degradation processes probably were dominated by (OH)-O-center dot. Next, possible degradation pathways were proposed and further justified by theoretical calculations of frontier electron densities. This investigation will contribute to the systematic elucidation of the ozonation process of UV filters in aquatic environments. (C) 2016 Elsevier Ltd. All rights reserved.
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