Cotransport of nanoplastics with nZnO in saturated porous media:From brackish water to seawater  

作　　者：Yuanzhang Hou Yange Wang Yidi Zhang Zhibo Lu Zhenbo Zhang Zhiqiang Dong Yuping Qiu 

机构地区：[1]Department of Environmental Science,College of Environmental Science and Engineering,Tongji University,State Key Laboratory of Pollution Control and Resources Reuse,Shanghai Institute of Pollution Control and Ecological Security,Shanghai 200092,China [2]School of Medicine,Tongji University,Shanghai 200065,China [3]Municipal Environmental Protection Engineering Co.,Ltd of CERC Shanghai Group,Shanghai 201906,China [4]China Railway Engineering Group Co.,Beijing 100039,China

出　　处：《Journal of Environmental Sciences》2025年第2期541-552,共12页环境科学学报(英文版)

基　　金：supported by the National Natural Science Foundation of China (No.22176148);the Shanghai Rising-Star Program (No.23QB1406400);the Fundamental Research Funds for the Central Universities of Tongji University (No.2023-3-ZD-02);supported by the program INTPART (Plastic Pollution,No.275172)funded by the Research Council of Norway.

摘　　要：The ocean serves as a repository for various types of artificial nanoparticles.Nanoplastics(NPs)and nano zinc oxide(nZnO),which are frequently employed in personal care products and food packaging materials,are likely simultaneously released and eventually into the ocean with surface runoff.Therefore,their mutual influence and shared destiny in marine environment cannot be ignored.This study examined how nanomaterials interacted and transported through sea sand in various salinity conditions.Results showed that NPs remained dispersed in brine,while nZnO formed homoaggregates.In seawater of 35 practical salinity units(PSU),nZnO formed heteroaggregates with NPs,inhibiting NPs mobility and decreasing the recovered mass percentage(Meff)from 24.52%to 12.65%.In 3.5 PSU brackish water,nZnO did not significantly aggregate with NPs,and thus barely affected their mobility.However,NPs greatly enhanced nZnO transport with Meff increasing from 14.20%to 25.08%,attributed to the carrier effect of higher mobility NPs.Cotransport from brackishwater to seawater was simulated in salinity change experiments and revealed a critical salinity threshold of 10.4 PSU,below which the mobility of NPs was not affected by coexisting nZnO and above which nZnO strongly inhibited NP transport.This study highlights the importance of considering the mutual influence and shared destiny of artificial nanoparticles in the marine environment and how their interaction and cotransport are dependent on changes in seawater salinity.

关 键 词：Homoaggregate Heteroaggregate TRANSPORT Sea sand Salinity threshold 

分 类 号：P73[天文地球—海洋科学]