两种微塑料对1-羟基芘吸附动力学对比及其机理分析

Comparison of Adsorption Kinetics of Monohydroxy Pyrene by Two Kinds of Microplastics and Its Mechanism Analysis

微塑料(MPs)具有吸附和迁移水环境中有机污染物的潜力.通过对比聚氯乙烯(PVC)和聚苯乙烯(PS)MPs对1-羟基芘(MOHP)的吸附特性,结合SEM、显微拉曼等表征手段,探讨MOHP与MPs的吸附机理.结果表明:PVC对MOHP的吸附能力最高,为0.1071μg·g-1,PS为0.0765μg·g-1;MOHP在PVC和PS微塑料上为二阶吸附动力学模型,拟合系数R 2分别0.9976、0.9566;比表面积、卤素键作用对微塑料吸附OHPAHs的吸附能力影响较大.该研究有助于加深对微塑料与OHPAHs相互作用的认识.

Microplastics(MPs)have the potential to adsorb and migrate organic pollutants in aquatic environments.By comparing the adsorption characteristics of polyvinyl chloride(PVC)and polystyrene(PS)MPs on monohydroxypyrene(MOHP),the adsorption mechanism of MOHP and MPs was investigated by means of SEM and microscopic Raman.The results demonstrated that:(1)PVC had the highest adsorption capacity for MOHP,which was 0.1071μg·g-1,and PS was 0.0765μg·g-1;(2)MOHP was a second-order adsorption kinetic model for PVC and PS microplastics,and the fitting coefficient R 2 was 0.9976 and 0.9566,respectively;(3)The specific surface area and halogen bond had great influence on the adsorption capacity of OHPAHs.This study is helpful to deepen the understanding of the interaction between microplastics and OHPAHs.