自然老化抑制聚苯乙烯微塑料吸附壬基酚的机理  

Mechanism of Natural Aging Inhibiting Adsorption of Nonylphenol by Polystyrene Microplastics

作　　者：康春莉 丁伟恒 何水源 于舒弋 杜蕊含 陈薇薇 KANG Chunli;DING Weiheng;HE Shuiyuan;YU Shuyi;DU Ruihan;CHEN Weiwei(College of New Energy and Environment,Jilin University,Changchun 130012,China)

机构地区：[1]吉林大学新能源与环境学院,长春130012

出　　处：《吉林大学学报(理学版)》2025年第1期262-270,共9页Journal of Jilin University:Science Edition

基　　金：吉林省科技发展计划项目(批准号:20230203017SF).

摘　　要：基于自然老化对微塑料吸附行为的重要影响,选取商用聚苯乙烯(PS)咖啡杯盖为微塑料的来源,利用室外自然过程获取自然老化的微塑料,选择壬基酚(NP)为目标污染物,研究自然老化前后PS微塑料对NP的吸附动力学和热力学特征,并结合扫描电子显微镜、比表面积分析仪、红外光谱和X射线光电子能谱等表征方式研究自然老化对微塑料吸附NP的影响机理.结果表明:伪二级(PSO)动力学模型能较好地拟合PS微塑料吸附NP的动力学过程;Henry模型和Freundlich模型均能较好地拟合PS微塑料对NP的吸附等温线.PS微塑料对NP的吸附机理包括分配作用、范德华力、氢键作用、π-π相互作用和疏水相互作用,老化后的PS和NP间的π-π相互作用和疏水相互作用减弱,从而抑制了NP的吸附.研究结果为准确评估PS微塑料和NP的生态风险提供了理论依据.Based on the significant impact of natural aging on the adsorption behavior of microplastics,we selected commercial polystyrene(PS)coffee cup lids as the microplastic source.Naturally aged microplastics were obtained through an outdoor natural process.Nonylphenol(NP)was chosen as the target pollutant.The adsorption kinetic and thermodynamic characteristics of NP by PS microplastics before and after natural aging were investigated.The influence mechanism of natural aging on the adsorption of NP by microplastics was studied by combining with various characterization methods,such as scanning electron microscopy,specific surface area analyzer,infrared spectroscopy,and X-ray photoelectron spectroscopy.The results show that the pseudo second-order(PSO)kinetic model can well fit the kinetic process of NP adsorption by PS microplastics.Both the Henry model and the Freundlich model can well fit the adsorption isotherms of NP by PS microplastics.The adsorption mechanism of NP by PS microplastics includes partitioning,van der Waals forces,hydrogen bonding,π-πinteractions and hydrophobic interactions.After aging,theπ-πinteractions and hydrophobic interactions between PS and NP are weakened,thereby inhibiting the adsorption of NP.The research results provide a theoretical basis for accurately assessing the ecological risks of PS microplastics and NP.

关 键 词：微塑料 聚苯乙烯 自然老化 壬基酚 吸附 

分 类 号：X131[环境科学与工程—环境科学]