微塑料
活性氧
光降解
光老化
化学
激进的
辐照
环境化学
生物物理学
光化学
光催化
生物化学
催化作用
遗传学
生物
物理
核物理学
作者
Kecheng Zhu,Hanzhong Jia,Yajiao Sun,Yunchao Dai,Chi Zhang,Xuetao Guo,Tiecheng Wang,Lingyan Zhu
出处
期刊:Water Research
[Elsevier]
日期:2020-01-29
卷期号:173: 115564-115564
被引量:408
标识
DOI:10.1016/j.watres.2020.115564
摘要
Microplastics may experience photoaging and breakdown into nanoplastics in aquatic environment as a result of long-term light irradiation. However, the underlying mechanisms responsible for the photodegradation of microplastics are largely overlooked. In this study, the photodegradation of microplastics, utilizing polystyrene microplastic (PS-MP) as a model, was investigated under irradiation with simulated solar light for as long as 150 d. A large amount of reactive oxygen species (ROS), including O2•-, 1O2, H2O2 and •OH, were detected in the PS-MP suspension due to light irradiation, which displayed significant relationships with the generated environmentally persistent free radicals (EPFRs). Distinct photoaging of PS-MP was observed with increased surface roughness and decreased particle size. However, these photoaging effects were significantly inhibited by ROS quenchers, suggesting that the generation ROS played a vital role in the PS-MP phototransformation. In addition, ROS induced formation of more oxidative functional groups on the PS-MP, thus enhancing the negative surface potential and the stability of PS-MP in water. This study elucidated the mechanism of formation of ROS by simulated solar light irradiated MPs and their subsequent roles in the phototransformation of MP, thus expanding current knowledge on the fate of MPs in aquatic environments.
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