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Influence of UV exposure time and simulated marine environment on different microplastic degradation

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Abstract

This study investigated the influence of environmental factors (UV radiation and salinity) in the degradative process of microplastics (MPs). MPs derived from polypropylene (PP), polystyrene (PS), and ethylene–vinyl acetate (EVA) were subjected to accelerated photodegradation while being submerged in distilled water or artificial seawater. Depending on the polymer, changes in surface properties, new functional chemical group formation and oxidative index, and thermal characteristics of samples were observed. After photodegradation experiments, EVA-MPs samples showed an increase in their thermal resistance, besides the changes in their surface. PP-MPs crystallinity index increased upon exposure to UV radiation. PS samples showed a higher carbonyl and hydroxyl index after 30 h of UV exposure. The methodology exploited applies to any location in the world and can be comparable once considering the total ultraviolet index (UVI). The saline medium increases the crystallinity index of PP and EVA-MPs samples and intensifies the formation of new carbonyl and hydroxyl bonds in EVA-MPs samples. The results showed that several environmental factors should be considered in interpreting MPs photodegradation.

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Acknowledgements

The authors thank CAPES for providing a master scholarship to Luana F. Silva. We also thank CEME-SUL (FURG) for SEM analysis and CIA (FURG) for thermal analysis. We also like to thank the student Kewin Castro (PIBIC/CNPQ graduate scholarship student) for his help in the SEM analysis. Sanye Soroldoni was a post-doctoral fellow (PDJ nº 150528/2020-5), and Grasiela L.L. Pinho was a research fellow (PQ2 nº 304495/2019-0) of CNPq. Felipe Kessler and Andreia N. Fernandes acknowledge the CNPq for a research grant (435612/2018-2 and 308220/2020-0). Special thanks to Dr. Walter Waldman for the contributions in manuscript revision.

Funding

This research was supported by FAPERGS (TO 18/2551–0000528-2) and CNPq (425520/2018–8, 435612/2018–2 and 406391/2021–1).

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LFS: conceptualization, laboratory work, data analysis, writing—original draft, writing—review and editing. SS: conceptualization, resources, laboratory work, data analysis, writing—review and editing. FK: resources, conceptualization, writing—review and editing. ANF: resources, conceptualization, writing—review and editing. GLLP: conceptualization, resources, writing—review and editing.

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Correspondence to Sanye Soroldoni.

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Responsible Editor: Thomas D. Bucheli

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da Silva, L.F., Soroldoni, S., Kessler, F. et al. Influence of UV exposure time and simulated marine environment on different microplastic degradation. Environ Sci Pollut Res 30, 121450–121464 (2023). https://doi.org/10.1007/s11356-023-30925-7

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  • DOI: https://doi.org/10.1007/s11356-023-30925-7

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