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首页> 外文期刊>The Science of the Total Environment >Adsorption of triclosan onto different aged polypropylene microplastics: Critical effect of cations
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Adsorption of triclosan onto different aged polypropylene microplastics: Critical effect of cations

机译：三氯生在不同老化聚丙烯微塑料上的吸附：阳离子的关键作用

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摘要

Adsorption of organic contaminants onto aged microplastics (MPs) may be important in understanding their transport potential and ecological risks in aquatic environment. Cations of Na~+ and Ca~(2+) are common electrolytes in water, which can greatly influence the adsorption behavior of MPs by impacting the electrostatic interaction between MPs and organic contaminants. The results of this study showed that aged isotactic polypropylene (iPP) MPs exhibited higher adsorption capacity to triclosan (TCS) than pristine ones, and the sorption affinity was enhanced with the increase of ionic concentrations. The crucial influence of cations on the adsorption behavior of aged MPs mainly depended on the changed properties of TCS and interactions between MPs and TCS. Salting out effect induced the precipitation of TCS from water and facilitated the partition of TCS onto MPs in high salinity water. Besides, compressing electrostatic double layer of MPs via squeezing out effect and bridging effect between functional groups of aged MPs and contaminants may also be significant factors in the sorption process. These findings will be helpful for understanding the role of cations on the transport of pollutants, the fate of MPs and their associated environmental risks in aquatic ecosystems.
机译：有机污染物在老化的微塑料（MPs）上的吸附对于理解其在水生环境中的运输潜力和生态风险可能很重要。 Na〜+和Ca〜（2+）阳离子是水中的常见电解质，通过影响MP与有机污染物之间的静电相互作用，可以极大地影响MP的吸附行为。这项研究的结果表明，老化的全同立构聚丙烯（iPP）MPs对三氯生（TCS）的吸附能力要高于原始的，并且随着离子浓度的增加其吸附亲和力也增强了。阳离子对老化MP吸附行为的关键影响主要取决于TCS性质的变化以及MP与TCS之间的相互作用。盐析效应诱导了TCS从水中的沉淀，并促进了TCS在高盐度水中分配到MP上。此外，通过挤出作用和老化MPs的官能团与污染物之间的桥连作用压缩MPs的静电双层也可能是吸附过程中的重要因素。这些发现将有助于理解阳离子在水生态系统中污染物的运输，MP的命运及其相关环境风险中的作用。

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