Concerns regarding microplastics pollution and their potential to concentrate and transport organic contaminants in aquatic environments are growing in recent years. Sorption of organic chemicals by microplastics may affect the distribution and bioavailability of the chemicals. Here sorption process of pyrene (Pyr), a frequently encountered polycyclic aromatic hydrocarbon in aquatic environments, on three types of mass-produced plastic particles (high-density polyethylene (PE), polystyrene (PS) and polyvinylchloride (PVC)), was investigated by comparative analysis of different sorption kinetic and isotherm models. Optimum kinetic and isotherm models were predicted by the linear least-squares regression method. The pseudo-second-order kinetic model was more appropriate in describing the entire sorption process (R² > 0.99). Sorption rates of Pyr onto microplastics were mainly controlled by intraparticle diffusion. PE exhibited the highest affinity for Pyr, followed by PS and PVC. The sorption equilibrium data were best fitted to the Langmuir isotherm (R² > 0.99), indicating monolayer coverage of Pyr onto the microplastics.

近年来，人们对微塑料污染及其在水生环境中浓缩和运输有机污染物的潜力的关注与日俱增。微塑料对有机化学物质的吸附可能会影响化学物质的分布和生物利用度。在此研究了pyr（Pyr）（一种在水生环境中经常遇到的多环芳烃）在三种类型的大量生产的塑料颗粒（高密度聚乙烯（PE），聚苯乙烯（PS）和聚氯乙烯（PVC））上的吸附过程。通过对不同吸附动力学和等温线模型的比较分析。通过线性最小二乘回归法预测了最佳动力学模型和等温模型。拟二级动力学模型更适合描述整个吸附过程（R ² > 0.99）。Pyr在微塑料上的吸附速率主要受颗粒内扩散控制。PE对Pyr表现出最高的亲和力，其次是PS和PVC。吸附平衡数据最适合Langmuir等温线（R ²  > 0.99），表明Pyr在微塑料上的单层覆盖。