Influence of macromolecules and electrolytes on heteroaggregation kinetics of polystyrene nanoplastics and goethite nanoparticles in aquatic environments.

Autor: Zeng D; College of Environment and Energy, South China University of Technology, Guangzhou 510006, China., Chen C; College of Natural Resources and Environment, Guangdong Provincial Key Laboratory of Agricultural & Rural Pollution Abatement and Environmental Safety, South China Agricultural University, Guangzhou 510642, China., Huang Z; College of Environment and Energy, South China University of Technology, Guangzhou 510006, China., Gu J; College of Environment and Energy, South China University of Technology, Guangzhou 510006, China., Zhang Z; College of Environment and Energy, South China University of Technology, Guangzhou 510006, China., Cai T; College of Environment and Energy, South China University of Technology, Guangzhou 510006, China., Peng J; College of Environment and Energy, South China University of Technology, Guangzhou 510006, China., Huang W; Department of Environmental Sciences, Rutgers, The State University of New Jersey, New Brunswick, NJ 08901, USA., Dang Z; College of Environment and Energy, South China University of Technology, Guangzhou 510006, China; The Key Lab of Pollution Control and Ecosystem Restoration in Industry Clusters, Ministry of Education, Guangzhou 510006, China., Yang C; College of Environment and Energy, South China University of Technology, Guangzhou 510006, China; The Key Lab of Pollution Control and Ecosystem Restoration in Industry Clusters, Ministry of Education, Guangzhou 510006, China. Electronic address: cyanggz@scut.edu.cn.
Jazyk: angličtina
Zdroj: Journal of hazardous materials [J Hazard Mater] 2024 Sep 15; Vol. 477, pp. 135257. Date of Electronic Publication: 2024 Jul 20.
DOI: 10.1016/j.jhazmat.2024.135257
Abstrakt: Fate and transport of nanoplastics in aquatic environments are affected by their heteroaggregation with minerals in the presence of macromolecules. This study investigated the heteroaggregation of polystyrene nanoplastics (PSNPs) with goethite nanoparticles (GNPs) under the influence of macromolecules [humic acid (HA), bovine serum albumin (BSA), and DNA] and electrolytes. Under 1 mg C/L macromolecule, raising electrolyte concentration promoted heteroaggregation via charge screening, except that calcium bridging with HA also enhanced heteroaggregation at CaCl 2 concentration above 5 mM. At all NaCl concentrations and CaCl 2 concentration below 5 mM, 1 mg C/L macromolecules strongly retarded heteroaggregation, ranking BSA > DNA > HA. Raising macromolecule concentration strengthened such stabilization effect of all macromolecules in NaCl solution and that of DNA and BSA in CaCl 2 solution by enhancing steric hindrance. However, 0.1 mg C/L BSA slightly promoted heteroaggregation in CaCl 2 solution due to stronger electrostatic attraction than steric hindrance. In CaCl 2 solution, raising HA concentration strengthened its destabilization effect via calcium bridging. Macromolecules having more compact globular structure and higher molecular weight may exert greater steric hindrance to inhibit heteroaggregation more effectively. This study provides new insights on the effects of macromolecules and electrolytes on heteroaggregation between nanoplastics and iron minerals in aquatic environments.
Competing Interests: Declaration of Competing Interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
(Copyright © 2024 Elsevier B.V. All rights reserved.)
Databáze: MEDLINE
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