An insight into aggregation kinetics of polystyrene nanoplastics interaction with metal cations  

作　　者：Yucheng Zhang Xiaotong Su Nora FYTam Xiaolan Lao Meiling Zhong Qihang Wu Huifang Lei Zihui Chen Zhang Li Jie Fu 

机构地区：[1]Key Laboratory for Water Quality and Conservation of the Pearl Stream Delta,Ministry of Education,School of Environmental Science and Engineering,Guangzhou University,Guangzhou 510006,China [2]State Key Laboratory of Marine Pollution and Department of Chemistry,City University of Hong Kong,Hong Kong,China [3]School of Science and Technology,Open University of Hong Kong,Hong Kong,China [4]School of Environmental Science and Engineering,Huazhong University of Science and Technology,Wuhan 430074,China

出　　处：《Chinese Chemical Letters》2022年第12期5213-5217,共5页中国化学快报（英文版）

基　　金：supported by Scientific Research Project of Guangzhou University(No.YK2020017);the Program Foundation of Institute for Scientific Research of Karst Area of NSFC-GZGOV(No.U1612442);Research Grants Council of the Hong Kong Special Administrative Region,China(No.UGC/IDS(R)16/19);IndustryUniversity Cooperation and Collaborative Education Project of the Ministry of Education of the People's Republic of China(No.202101134012);Innovative training program for College Students of Guangzhou University(No.S202111078039).

摘　　要：Once inevitably released into the aquatic environment,polystyrene nanoplastics(PS-NPs)will present complicated environmental behaviors,of which the aggregation is a key process determining their environmental fate and impact.In this study,the aggregation kinetics of different sizes(30 nm and 100 nm)of PS-NPs with metal cations(Na^(+),K^(+),Ca^(2+),Mg^(2+)and Pb^(2+))at different solution pH(3,6 and 8)were investigated.The results showed that the aggregation of PS-NPs increased with cation concentration.Taking Pb^(2+)as an example,the adsorption behavior of cations onto PS-NPs was determined by transmission electron microscopy(TEM)and energy dispersive X-ray(EDX)spectroscopy,which demonstrated Pb^(2+)could be adhered onto the surface of PS-NPs with the effect of charge neutralization.The critical coagulation concentrations(CCC)of smaller PS-NPs were higher than that of larger PS-NPs for monovalent cations,whereas a different pattern is observed for divalent cations.It was suggested that there were other factors that DLVO theory does not consider affect the stability of NPs with different particle sizes.In addition,it should be noted that PS-NPs had the capacity of adsorbing large amounts of heavy metal cations and carried them transport to a long distance,and the corresponding ecological risks need to further elucidate.

关 键 词：Polystyrene nanoplastics Lead cation Aggregation kinetics Critical coagulation concentration Size effect 

分 类 号：X705[环境科学与工程—环境工程] X52