Uptake and release of perfluoroalkyl carboxylic acids (PFCAs) from macro and microplastics
Uptake and release of perfluoroalkyl carboxylic acids (PFCAs) from macro and microplastics
复制标题
大塑料和微塑料中全氟烷基羧酸 (PFCA) 的吸收和释放
DOI：
10.1039/d3em00209h
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发表时间：
2023
期刊：
影响因子：
--
通讯作者：
Bharti, Bhuvnesh
中科院分区：
文献类型：
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作者：
Brahana, Philip J.;Al Harraq, Ahmed;Saab, Luis E.;Roberg, Ruby;Valsaraj, Kaillat T.;Bharti, Bhuvnesh
微塑料和全氟烷基和多氟烷基物质（PFAS）是环境中报告的两种最显著的新污染物。微米级和纳米级塑料具有很高的表面积体积比，这可能会增加它们吸附PFAS等污染物的潜力。全氟烷基羧酸（PFCAs）是最受关注的一类全氟烷基羧酸。PFCAs通常与其他环境污染物在同一背景下进行研究，但它们的两亲性在决定其在环境中的命运时往往被忽视。由于缺乏考虑，人们对pfca的环境流动性以及它们与环境介质的相互作用的了解有所减少。在这里，我们研究了PFCAs与聚乙烯微塑料的相互作用，并确定了环境风化在改变相互作用性质中的作用。通过一系列的吸附-解吸实验，我们描述了氟烷基尾巴在PFCAs与微塑料结合中的作用。随着氟烷基链上碳原子数的增加，PFCAs在微塑料上的吸附量也相应增加。这种关系可以被环境风化所改变，pfca在暴露于模拟阳光下后从宏观和微观塑料表面释放出来。这项研究确定了PFCAs和塑料污染物之间的基本关系，它们可以相互影响它们的热力学和运输性质。
Microplastics and per- and polyfluoroalkyl substances (PFAS) are two of the most notable emerging contaminants reported in the environment. Micron and nanoscale plastics possess a high surface area-to-volume ratio, which could increase their potential to adsorb pollutants such as PFAS. One of the most concerning sub-classes of PFAS are the perfluoroalkyl carboxylic acids (PFCAs). PFCAs are often studied in the same context as other environmental contaminants, but their amphiphilic properties are often overlooked in determining their fate in the environment. This lack of consideration has resulted in a diminished understanding of the environmental mobility of PFCAs, as well as their interactions with environmental media. Here, we investigate the interaction of PFCAs with polyethylene microplastics, and identify the role of environmental weathering in modifying the nature of interactions. Through a series of adsorption–desorption experiments, we delineate the role of the fluoroalkyl tail in the binding of PFCAs to microplastics. As the number of carbon atoms in the fluoroalkyl chain increases, there is a corresponding increase in the adsorption of PFCAs onto microplastics. This relationship can become modified by environmental weathering, where the PFCAs are released from the macro and microplastic surface after exposure to simulated sunlight. This study identifies the fundamental relationship between PFCAs and plastic pollutants, where they can mutually impact their thermodynamic and transport properties.