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

Autor: da Silva LF; Programa de Pós-Graduação Em Oceanologia, Instituto de Oceanografia, Universidade Federal Do Rio Grande (FURG), Av. Itália Km 8, Rio Grande, RS, 96203-900, Brazil., Soroldoni S; Programa de Pós-Graduação Em Oceanologia, Instituto de Oceanografia, Universidade Federal Do Rio Grande (FURG), Av. Itália Km 8, Rio Grande, RS, 96203-900, Brazil. sanyesoroldoni@gmail.com., Kessler F; Escola de Química E Alimentos, Universidade Federal Do Rio Grande (FURG), Av. Itália Km 8, Rio Grande, RS, 96203-900, Brazil., Fernandes AN; Instituto de Química, Universidade Federal Do Rio Grande Do Sul (UFRGS), Av. Bento Gonçalves, 9500, Prédio A, Sala 218/2, Porto Alegre, RS, 91501-970, Brazil., Pinho GLL; Programa de Pós-Graduação Em Oceanologia, Instituto de Oceanografia, Universidade Federal Do Rio Grande (FURG), Av. Itália Km 8, Rio Grande, RS, 96203-900, Brazil.
Jazyk: angličtina
Zdroj: Environmental science and pollution research international [Environ Sci Pollut Res Int] 2023 Dec; Vol. 30 (58), pp. 121450-121464. Date of Electronic Publication: 2023 Nov 11.
DOI: 10.1007/s11356-023-30925-7
Abstrakt: 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.
(© 2023. The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature.)
Databáze: MEDLINE
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