Adsorption of organic pollutants by microplastics: Overview of a dissonant literature
Adsorption of organic pollutants by microplastics: Overview of a dissonant literature
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DOI：
10.1016/j.hazadv.2022.100091
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发表时间：
2022-05-01
期刊：
影响因子：
--
通讯作者：
Apul, Onur
中科院分区：
文献类型：
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作者：
Costigan, Eliza;Collins, Ashton;Apul, Onur
微塑料在水体系中的形成是塑料污染不可避免的后果之一，它具有连锁的环境和健康影响。随着微塑性尺寸随着时间的推移而变小，它们的表面积增加，这就产生了一个隐含的、动态的和膨胀的新领域，称为微塑性球体。这项研究总结并批判性地回顾了关于有机化合物(OCs)在微塑料表面上的吸附的文献，这些有机化合物已经存在于我们的水生系统中。本文综述了一个包含91篇文献的数据库，其中68篇用于178个OCS的770等温线的吸附分析。在整个文献中，最流行的四种聚合物类型是聚乙烯(PE)、聚苯乙烯(PS)、聚丙烯(PP)和聚氯乙烯(PVC)。我们的分析表明，辛醇-水分配系数Kow可以很好地替代某些聚合物和OC类型的吸附容量；然而，OC的疏水性并不一定表明吸附亲和力。水化学在吸附过程中也起着显著的作用，在盐水条件下，PS对全氟烷基和多氟烷基(PFAS)的吸附显著增强。然而，我们的工作结论是，数据库中的可变性表明，迫切需要明确的微塑料表征和测试程序，以更好地代表微塑料与环境的相互作用。
Microplastic formation in aqueous systems is among the inevitable consequences of plastic pollution, which has cascading environmental and health implications. As the microplastic sizes get smaller over time, their surface areas increase, which creates an implicit, dynamic, and inflating new domain, called the microplastisphere. This study summarizes and critically reviews literature on the adsorption of organic compounds (OCs), which are already in our aquatic systems, onto microplastic surfaces. This investigation reviews a database of 91 articles, 68 of which are used in an adsorption analysis for 178 OCs via 770 isotherms. The four most prevalent polymer types throughout the literature are polyethylene (PE), polystyrene (PS), polypropylene (PP), and polyvinyl chloride (PVC). Our analysis revealed that the octanol-water partitioning coefficient, Kow, can be a good surrogate for adsorption capacity for some polymer and OC types; however, the hydrophobicity of the OC alone may not necessarily indicate adsorption affinity. The water chemistry also played notable roles on the adsorption process, evidenced by the dramatic enhancement of adsorption during per-and polyfluoroalkyl (PFAS) adsorption onto PS in saltwater conditions. However, our work concluded that the variability within the database indicates a strong need for defined microplastics characterization and testing procedures to better represent the interactions of microplastics with the environment.