聚酰胺微塑料对磺酸类全氟烷基化合物在水-土界面吸附的影响  

Effect of polyamide microplastics on the adsorption of sulfonic acid perfluoroalkyl compounds at the water-soil interface

作　　者：杜钰赞 孙姣霞[1] 付江 向红 罗雪 杨帆 王茜 樊建新[1] DU Yu-zan;SUN Jiao-xia;FU Jiang;XIANG Hong;LUO Xue;YANG Fan;WANG Xi;FAN Jian-xin(School of River and Ocean Engineering,Chongqing Jiaotong University,Chongqing 400074,China)

机构地区：[1]重庆交通大学河海学院,重庆400074

出　　处：《中国环境科学》2025年第3期1754-1764,共11页China Environmental Science

基　　金：重庆市自然科学基金资助项目(CSTB2024NSCQ-MSX0681);重庆市大学生创新创业项目(X202410618022);重庆交通大学科创项目(2024S0056)。

摘　　要：本文探索了聚酰胺(PA)微塑料和土壤互作体系对两种磺酸类全氟烷基化合物—6:2氟调聚磺酸(6:2FTSA)和全氟己烷磺酸(PFHx S)的吸附和分配过程以及不同影响因素对它们的吸附影响.结果表明:6:2FTSA和PFHx S在微塑料-土壤互作体系上达到吸附平衡的时间(约120h)慢于在单一的微塑料和土壤体系(约24h),且其吸附平衡容量(6:2FTSA:0.044mg/g;PFHxS:0.173mg/g)远低于PA微塑料(6:2FTSA:2.698mg/g;PFHxS:3.518mg/g),但高于土壤(6:2FTSA:0.026mg/g;PFHxS:0.048mg/g).随着土壤中微塑料的含量增加,6:2FTSA和PFHxS在土壤中微塑料上的分配占比逐渐增加,PFHxS尤为显著.从微塑料的角度分析,微塑料和土壤互作体系改变了微塑料表面性质,土壤矿物占据部分吸附位点,显著降低了微塑料对两种磺酸类全氟烷基化合物的吸附.从土壤的角度分析,土壤中微塑料的加入提高了土壤对全氟烷基类化合物的吸附,且随着微塑料占比越大越显著,这归因于微塑料对全氟烷基类化合物较强的吸附作用力.在微塑料-土壤共培养体系中,尽管微塑料表面性质随培养时间发生明显变化,但对两种全氟烷基类化合物的吸附影响较小,表明微塑料对土壤中的全氟烷基类化合物持长久且较为稳定的影响.In this study,the adsorption and distribution processes of 6:2 fluorotelomer sulfonic acid(6:2 FTSA)and perfluorohexane sulfonate(PFHxS)in polyamide(PA)microplastics and soil interaction systems were investigated,and the effects of various factors on their adsorption were explored.The results indicated that the adsorption equilibrium time for 6:2 FTSA and PFHxS in the microplastic-soil interaction system(approximately 120 hours)was significantly slower than in individual microplastic and soil systems(approximately 24 hours).Furthermore,the adsorption equilibrium capacity of 6:2 FTSA(0.044mg/g)and PFHxS(0.173mg/g)in the microplastic-soil interaction system was considerably lower than in PA microplastics alone(6:2FTSA:2.698mg/g;PFHxS:3.518mg/g),but slightly higher than in soil alone(6:2FTSA:0.026mg/g;PFHxS:0.048mg/g).With the increase of the content of microplastics in soil,the proportion of 6:2FTSA and PFHxS on microplastics gradually increased,especially for PFHxS.From the perspective of microplastics,the interaction with soil altered the surface properties of microplastics.As soil minerals occupied some adsorption sites of microplastics,the adsorption capacity of microplastics for 6:2FTSA and PFHx S was significantly reduced.Conversely,from the soil perspective,the presence of microplastics enhanced the soil's adsorption capacity for 6:2FTSA and PFHxS,with this effect becoming more pronounced as the proportion of microplastics increased,due to the strong adsorption affinity of microplastics for PFAS.In the co-cultivation system of microplastics and soil,although the surface properties of microplastics were modified over time,the overall adsorption of 6:2FTSA and PFHxS by the PA microplastics-soil system was not been significantly altered.These findings suggest that microplastics exert a long-lasting and relatively stable influence on PFAS in soil.

关 键 词：微塑料 土壤 相互作用 磺酸类全氟烷基化合物 吸附 影响因素 

分 类 号：X53[环境科学与工程—环境工程]