Photo-aging of polyvinyl chloride microplastic in the presence of natural organic acids
- Authors
- Wang, Chao; Xian, Zeyu; Jin, Xin; Liang, Sijia; Chen, Zhanghao; Pan, Bo; Wu, Bing; Ok, Yong Sik; Gu, Cheng
- Issue Date
- 15-9월-2020
- Publisher
- PERGAMON-ELSEVIER SCIENCE LTD
- Keywords
- Polyvinyl chloride microplastic; Low-molecular-weight organic acid; Reactive oxygen species; Dechlorination; Aging process
- Citation
- WATER RESEARCH, v.183
- Indexed
- SCIE
SCOPUS
- Journal Title
- WATER RESEARCH
- Volume
- 183
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/53151
- DOI
- 10.1016/j.watres.2020.116082
- ISSN
- 0043-1354
- Abstract
- In this study, a new photo-aging pathway in the aquatic environments and the underlying transformation mechanism were described for polyvinyl chloride microplastic (PVC-MP). Our results indicated that the photo-aging of PVC-MP was strongly dependent on particle size and the aging reaction could be facilitated in the presence of low-molecular-weight organic acid (LMWOA) and LMWOA-Fe(III) complex under simulated and natural sunlight irradiation and ambient conditions. The hydroxyl radical (OH center dot) generated from the photolysis of LMWOA or its ferric complexes played a dominant role in enhancing PVC-MP degradation. In situ Fourier transform infrared and Raman spectroscopic techniques and theoretical calculations further confirmed that C-Cl bond cleavage and formation of polyene and carbonyl underwent on the PVC-MP surface, especially in the presence of LMWOA and LMWOA-Fe(III). Moreover, PVC-MP surface oxidation also led to the increase of the specific surface area and affinity towards water as indicated by the results of scanning electron microscopy, Brunauer-Emmett-Teller tests and contact angles for water, which would further enhance the adsorption of polar contaminants on PVC-MP and thus increase the health risk of PVC-MP on aquatic organisms. (C) 2020 Elsevier Ltd. All rights reserved.
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Collections - College of Life Sciences and Biotechnology > Division of Environmental Science and Ecological Engineering > 1. Journal Articles
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