https://scholars.lib.ntu.edu.tw/handle/123456789/598500
標題: | Photoaged polystyrene microplastics serve as photosensitizers that enhance cimetidine photolysis in an aqueous environment | 作者: | Wang H.-J Lin H.H.-H Hsieh M.-C ANGELA YU-CHEN LIN |
關鍵字: | Environmentally persistent free radicals;Pharmaceuticals;Photodegradation;Polystyrene microplastics;Reactive species;Irradiation;Photolysis;Photosensitizers;Polystyrenes;Aging time;Aquatic environments;Aqueous environment;Environmentally persistent free radical;Microplastics;Photo degradation;Photo-aging;Photosensitiser;Polystyrene microplastic;Free radicals;absorbance;irradiation;photochemistry;photodegradation;photolysis;plastic waste;polymer;cimetidine;photosensitizing agent;plastic;polystyrene derivative;water pollutant;Cimetidine;Photosensitizing Agents;Plastics;Water Pollutants, Chemical | 公開日期: | 2022 | 卷: | 290 | 來源出版物: | Chemosphere | 摘要: | Microplastics (MPs) have received much attention in recent years because of their continuous photoaging process in aquatic environments. However, little research has been conducted on the photochemistry of aged microplastics and the associated effects on coexisting pharmaceuticals. This study investigated the photodegradation of cimetidine via aged polystyrene microplastics (PS-MPs) with different aging times (0–7 d) under simulated sunlight irradiation (700 W/m2). PS-MPs with 5 d of aging time resulted in much faster cimetidine degradation (>99%) after 2 h of irradiation than pristine PS-MPs (<8%). The enhanced photodegradation of cimetidine by aged PS-MPs was related to the increase in chromophoric oxygenated groups (C[dbnd]O, C–O) followed by redshifted absorbance through the photoaging process, which induced the formation of the environmentally persistent free radicals (EPFRs) [rad]OH, 1O2 and 3PS*. However, only 1O2 and 3PS* contributed to enhanced cimetidine photodegradation, with 1O2 playing a more important role in our case. This work also demonstrated that other compounds that are susceptible to indirect photolysis, such as codeine and morphine, are likewise significantly degraded under irradiation in the presence of aged PS-MPs. Although previous studies have reported how MPs can increase the persistence of contaminants, this study demonstrates that MPs can serve as photosensitizers and alter the fate of coexisting pharmaceuticals in aquatic environments. ? 2021 Elsevier Ltd |
URI: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-85121453700&doi=10.1016%2fj.chemosphere.2021.133352&partnerID=40&md5=96723a194d1c9ce56b6d2b71601e3c55 https://scholars.lib.ntu.edu.tw/handle/123456789/598500 |
ISSN: | 00456535 | DOI: | 10.1016/j.chemosphere.2021.133352 |
顯示於: | 環境工程學研究所 |
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