Accelerated aging of polyvinyl chloride microplastics by UV irradiation: aging characteristics, filtrate analysis, and adsorption behavior

Environmental Technology and Innovation Pub Date : 2023-10-01 DOI:10.1016/j.eti.2023.103405

Kefu Wang, Kangkang Wang, Siqi Liang, Changyan Guo, Wei Wang, Jide Wang

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Abstract

The extensive use of plastic products by people has led to the prevalence of microplastics (MPs) in aquatic and terrestrial ecosystems. MPs will be able to undergo multiple aging processes and release dissolved organic matter (DOM) in the aquatic environment, thereby further affecting the ecosystem. Therefore, this thesis systematically investigated the photo-aging properties of polyvinyl chloride (PVC), and characterized the changes in physicochemical properties; in addition, the DOM composition and fluorescence characteristics of MPs leachate were characterized by using TOC and 3D-EEMs. Our results showed that the O/C ratio can quantitatively characterize the surface aging of MPs. Furthermore, We chose Malachite green (MG) and Sulfamethoxazole (SMX), which are abundantly present in the aqueous environment, as the target pollutants, through adsorption experiments we established the regression equations of the equilibrium adsorption capacity of aging MPs with O/C ratio or CI and mean particle size. Exploring the relationship between aging properties and the adsorption capacity of microplastics can help predict the degree of aging and accumulation of hydrophilic contaminants in the natural environment.

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紫外线辐照下聚氯乙烯微塑料加速老化:老化特性、滤液分析及吸附行为

人们对塑料制品的广泛使用导致了微塑料在水生和陆地生态系统中的普遍存在。MPs会经历多次老化过程，并在水生环境中释放溶解的有机物(DOM)，从而进一步影响生态系统。因此，本文系统地研究了聚氯乙烯(PVC)的光老化性能，并对其理化性能的变化进行了表征;此外，利用TOC和3D-EEMs对MPs渗滤液的DOM组成和荧光特性进行了表征。结果表明，O/C比值可以定量表征MPs的表面时效。此外，我们选择了大量存在于水环境中的孔雀石绿(MG)和磺胺甲氧唑(SMX)作为目标污染物，通过吸附实验建立了老化MPs平衡吸附容量与O/C比或CI和平均粒径的回归方程。探索微塑料的老化性能与吸附量之间的关系，有助于预测自然环境中亲水污染物的老化程度和积累情况。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Environmental Technology and Innovation

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