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Long-term phototransformation of microplastics under simulated sunlight irradiation in aquatic environments: Roles of reactive oxygen species.
Water Research ( IF 11.4 ) Pub Date : 2020-01-29 , DOI: 10.1016/j.watres.2020.115564 Kecheng Zhu 1 , Hanzhong Jia 1 , Yajiao Sun 1 , Yunchao Dai 1 , Chi Zhang 1 , Xuetao Guo 1 , Tiecheng Wang 1 , Lingyan Zhu 2
Water Research ( IF 11.4 ) Pub Date : 2020-01-29 , DOI: 10.1016/j.watres.2020.115564 Kecheng Zhu 1 , Hanzhong Jia 1 , Yajiao Sun 1 , Yunchao Dai 1 , Chi Zhang 1 , Xuetao Guo 1 , Tiecheng Wang 1 , Lingyan Zhu 2
Affiliation
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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.
中文翻译：
在水生环境中模拟的阳光照射下，微塑料的长期光转化：活性氧的作用。
由于长期的光照射，微塑料可能会在水生环境中经历光老化并分解为纳米塑料。但是，导致微塑料光降解的潜在机制被大大地忽略了。在这项研究中，以聚苯乙烯微塑料（PS-MP）为模型，在长达150 d的模拟太阳光照射下，对微塑料的光降解进行了研究。由于光照射，在PS-MP悬浮液中检测到大量的活性氧（ROS），包括O2•-，1O2，H2O2和•OH，这与所产生的环境持久性自由基（EPFR）呈显着关系。 。观察到PS-MP明显的光老化，表面粗糙度增加，粒径减小。然而，这些光老化作用被ROS淬灭剂显着抑制，表明ROS的产生在PS-MP光转化中起着至关重要的作用。另外，ROS引起PS-MP上更多氧化官能团的形成，从而增强了PS-MP在水中的负表面电位和稳定性。这项研究阐明了模拟太阳光照射的MP形成ROS的机理及其在MP的光转化中的作用，从而扩展了有关水生环境中MP命运的最新知识。
更新日期：2020-01-29
中文翻译：
在水生环境中模拟的阳光照射下，微塑料的长期光转化：活性氧的作用。
由于长期的光照射，微塑料可能会在水生环境中经历光老化并分解为纳米塑料。但是，导致微塑料光降解的潜在机制被大大地忽略了。在这项研究中，以聚苯乙烯微塑料（PS-MP）为模型，在长达150 d的模拟太阳光照射下，对微塑料的光降解进行了研究。由于光照射，在PS-MP悬浮液中检测到大量的活性氧（ROS），包括O2•-，1O2，H2O2和•OH，这与所产生的环境持久性自由基（EPFR）呈显着关系。 。观察到PS-MP明显的光老化，表面粗糙度增加，粒径减小。然而，这些光老化作用被ROS淬灭剂显着抑制，表明ROS的产生在PS-MP光转化中起着至关重要的作用。另外，ROS引起PS-MP上更多氧化官能团的形成，从而增强了PS-MP在水中的负表面电位和稳定性。这项研究阐明了模拟太阳光照射的MP形成ROS的机理及其在MP的光转化中的作用，从而扩展了有关水生环境中MP命运的最新知识。
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