Photo-aging of polyvinyl chloride microplastic in the presence of natural organic acids

Water Research
Chao WangCheng Gu

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•) 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 aquat...Continue Reading

Citations

Dec 18, 2020·The Science of the Total Environment·Fritz Petersen, Jason A Hubbart
Feb 23, 2021·Journal of Hazardous Materials·Hongwei LuoXiangliang Pan
Mar 20, 2021·The Science of the Total Environment·Peng LiuShixiang Gao
Mar 27, 2021·The Science of the Total Environment·Oluchi MbachuChris Pratt
May 20, 2021·Journal of Hazardous Materials·Katarzyna JędruchniewiczPatryk Oleszczuk
Nov 11, 2021·Environmental Science & Technology·Xiaowei WuShixiang Gao

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