Different sorption behaviours of pyrene onto polyethylene microplastics in a binary system with water and a ternary system with water and sediment

吸附 微塑料 化学 环境化学 沉积物 吸附 污染物 三元运算 化学工程 有机化学 地质学 计算机科学 工程类 古生物学 程序设计语言
作者
Yat Hei Fung,Jie Han,N.F.Y. Tam,Jian Lin Chen,Sidney Man Ngai Chan,Siu Gin Cheung,Haichao Zhou,Chui‐Man Lo,Yongzheng Ma
出处
期刊:Environmental Technology and Innovation [Elsevier BV]
卷期号:30: 103086-103086 被引量:4
标识
DOI:10.1016/j.eti.2023.103086
摘要

Microplastics (MPs) and polycyclic aromatic hydrocarbons (PAHs) are two ubiquitous coexisting pollutants that pose potential threats to the environment and organisms and have attracted increasing attention in recent years. However, the interaction between these two pollutants in water, with and without sediment, and the associated mechanisms have not been fully understood. This study aims to explore differences in the sorption behaviours of pyrene at environmentally realistic concentrations by polyethylene MPs (PE-MPs) in binary (water-MPs) and ternary (water-MPs-sediment) systems and to elucidate the role of sediment in the sorption process. Kinetic and isothermal studies show that sediment acted as a "sponge" to adsorb the vast majority of pyrene at the beginning of the sorption experiment in the ternary system, which behaved differently than in the binary system. The sediment-sorbed pyrene was then gradually released but re-adsorbed by PE-MPs, while the concentration of pyrene in water remained at a steady low level. These findings reveal that PE-MPs exhibited a higher pyrene affinity than sediment and being potential pyrene carriers in aqueous systems. Through sorption kinetics and isotherm models study, it was found that pseudo-second-order (PSO) kinetics (0.9773), Elovich (0.9314) and Henry's (0.9850) models has the highest R2 value, indicating that chemisorption and hydrophobic interactions were attributed to the sorption process. The present study also demonstrates the competition between sediment and MPs in adsorption of pyrene, and highlights the impact of sediment and MPs in the partitioning of PAHs in aquatic environments, which may change the fate of pollution carried by MPs.
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