[Effect of Water Components on Aggregation and Sedimentation of Polystyrene Nanoplastics].
Huan Jing Ke Xue
; 45(2): 854-861, 2024 Feb 08.
Article
em Zh
| MEDLINE
| ID: mdl-38471924
ABSTRACT
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 ï¼NOMï¼ on the aggregation and sedimentation of polystyrene nano-plastics ï¼PS-NPsï¼ in the aqueous phase. Six types of waterï¼ such as seawaterï¼ lake waterï¼ and domestic sewageï¼ 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-1ï¼ 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-NPsï¼ 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 watersï¼ environmental waters enhanced the aggregation of PS-NPsï¼ which may have been related to the amino acidï¼ proteinï¼ and other organic macro-molecules in the water.
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1
Coleções:
01-internacional
Base de dados:
MEDLINE
Idioma:
Zh
Revista:
Huan Jing Ke Xue
Ano de publicação:
2024
Tipo de documento:
Article
País de afiliação:
China