Effect of Water Components on Aggregation and Sedimentation of Polystyrene Nanoplastics

被引：0

作者：

Tang D.-Y. ^{[1
,2
,3
]}

Zheng W.-L. ^{[2
,3
]}

Chen G.-T.-Y. ^{[2
,3
]}

Chen S.-L. ^{[2
,3
]}

Chen Y. ^{[2
,3
]}

Zhao X.-L. ^{[4
]}

Wang H. ^{[2
,3
]}

机构：

[1] Hubei Key Laboratory of Petroleum Geochemistry and Environment, Yangtze University, Wuhan

[2] South China Institute of Environmental Sciences, Ministry of Ecology and Environment, Guangzhou

[3] Research Institute of Eco-environmental Emergency, Ministry of Ecology and Environment, Guangzhou

[4] State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environment Sciences, Beijing

来源：

Huanjing Kexue/Environmental Science | 2024年 / 45卷 / 02期

关键词：

aggregation; environmental waters; nano-plastics; polystyrene（PS）; sedimentation;

D O I：

10.13227/j.hjkx.202302026

中图分类号：

学科分类号：

摘要：

The aggregation and sedimentation of micro/nano-plastics significantly affect their migration and distribution in the environment. This study investigated the effects of Na+ and natural organic matter（NOM）on the aggregation and sedimentation of polystyrene nano-plastics（PS-NPs）in the aqueous phase. Six types of water，such as seawater，lake water，and domestic sewage，were used to evaluate the above effects and other potential influencing factors. The results indicated that Na+ could facilitate the sedimentation of PS-NPs when it was less than 80 mmol·L-1，whereas it could promote the aggregation and suspension of PS-NPs when the concentration was greater than 80 mmol·L-1. NOM molecules affected the aggregation and sedimentation of PS-NPs by changing the ζ potential and relative density of particles via forming a multilayer adsorption structure with Na+ on the particle surface. It was observed that NOM greater than 10 mg·L-1 enhanced the dispersion and suspension of PS-NPs，which might have been attributed to the decrease in relative density of the particles as a large amount of NOM was absorbed onto the surface. Compared with synthetic waters，environmental waters enhanced the aggregation of PS-NPs，which may have been related to the amino acid，protein，and other organic macro-molecules in the water. © 2024 Science Press. All rights reserved.

引用

页码：854 / 861

页数：7

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