The difference of aggregation mechanism between microplastics and nanoplastics: Role of Brownian motion and structural layer force
文献类型：期刊论文
| 作者 | Sun, Hongyan; Jiao, Ruyuan ; Wang, Dongsheng
|
| 刊名 | ENVIRONMENTAL POLLUTION
 |
| 出版日期 | 2021 |
| 卷号 | 268页码:- |
| 关键词 | Microplastics Nanoplastics Aggregation mechanism Structural layer force Ion species |
| ISSN号 | 0269-7491 |
| 英文摘要 | In recent years, microplastics (MPs) and nanoplastics (NPs) have attracted worldwide attention because of the potential risks they pose to aquatic environments, but there are few studies on the difference of aggregation mechanism between MPs and NPs. In this study, 100 nm and 1 mu m polystyrene plastics were selected as models to explore the aggregation mechanism of MPs/NPs under different aquatic environments. The influence of ion species and concentrations on the aggregation behaviors and kinetics were systematically investigated to predict the effects of water quality on the occurrence form of MPs and NPs based on DLVO theory and revised modified Smoluchowski theory. Results showed concentration, valence and hydrated ability of cations jointly affected the aggregation behavior of NPs. The critical coagulation concentration ratio of cations were consistent with Schulze-Hardy rules. But the different aggregation rate coefficients of same valent cations were ascribed to the structural layer force. Anion species played a role in the reaction-controlled regime by producing hydrogen ions to neutralize negative charges on NPs surfaces. Due to the strong Brownian motion and structural layer force, NPs would be stable in freshwater but preferentially aggregated when transport through brackish water, estuaries, eutrophication and high hardness areas and sea water, forming the accumulation hot spots of NPs in the sediment. While for MPs, physical process controlled the aggregation mechanism of them, leading to high stability in natural water and eventually transporting into marine environments. This study provided a theoretical foundation for assessing the transport, distribution, fate and ecological risks of MPs and NPs in realistic aquatic environments. (C) 2020 Elsevier Ltd. All rights reserved. |
| WOS研究方向 | Environmental Sciences |
| 源URL | [http://ir.rcees.ac.cn/handle/311016/46005]  |
| 专题 | 生态环境研究中心_环境水质学国家重点实验室 |
| 作者单位 | 1.Chinese Acad Sci, Res Ctr Ecoenvironm Sci, State Key Lab Environm Aquat Chem, Beijing 100085, Peoples R China 2.Chinese Acad Sci, Res Ctr Ecoenvironm Sci, Key Lab Drinking Water Sci & Technol, Beijing 100085, Peoples R China 3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China |
| 推荐引用方式 GB/T 7714 | Sun, Hongyan,Jiao, Ruyuan,Wang, Dongsheng. The difference of aggregation mechanism between microplastics and nanoplastics: Role of Brownian motion and structural layer force[J]. ENVIRONMENTAL POLLUTION,2021,268:-. |
| APA | Sun, Hongyan,Jiao, Ruyuan,&Wang, Dongsheng.(2021).The difference of aggregation mechanism between microplastics and nanoplastics: Role of Brownian motion and structural layer force.ENVIRONMENTAL POLLUTION,268,-. |
| MLA | Sun, Hongyan,et al."The difference of aggregation mechanism between microplastics and nanoplastics: Role of Brownian motion and structural layer force".ENVIRONMENTAL POLLUTION 268(2021):-. |
入库方式： OAI收割
来源：生态环境研究中心
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