期刊
SCIENCE OF THE TOTAL ENVIRONMENT
卷 806, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.scitotenv.2021.150358
关键词
EPS; Heteroaggregation; Environmental behavior; NPs; Interaction mechanism
资金
- National Key Research and Development Program [2019YFC1804400]
- National Natural Science Foundation of China [41907330]
- Natural Science Foundation of Jiangsu Province, China [BK20191104]
- Youth Talent Promotion Program of Jiangsu Association for Science and Technology
The interaction between CeO2 NPs and different SMPs is influenced by surface properties, with EPS inhibiting heteroaggregation with positively charged goethite while its influence on negatively charged SMPs depends more on steric stabilization. EPS may enhance CeO2 NPs migration in the environment, increasing risks to human health and ecosystems.
Interaction with soil mineral particles (SMPs) and organic matters can significantly determine the fate of nano particles (NPs) in the environment such as waters, sediments, and soils. In this study, the heteroaggregation of CeO2 NPs with different soil minerals (kaolinite, montmorillonite, goethite and hematite) and the influence of extracellular polymeric substance (EPS) were studied. The obvious heteroaggregation between CeO2 NPs with different SMPs were demonstrated via co-settling and aggregation kinetics experiments. The variety in the heteroaggregation between CeO2 NPs with different SMPs is mainly induced by the difference in their surface properties, such as surface charge, specific surface areas and surface complexation. The presence of EPS can result in great inhibition on the heteroaggregation between CeO2 NPs with the positive charged goethite by enhancing the electrostatic repulsion between NPs and mineral colloids. However, the influence of EPS on the interaction between CeO2 NPs with negative charged SMPs is more dependent on the steric stabilization. The presence of EPS may promote the migration of CeO2 NPs in environment and then increase their risks to human health and ecosystems. These findings contribute to better understanding interactions between NPs and SMPs and have important implications on predicting the behaviors and risks of NPs in the natural environment. (C) 2021 Published by Elsevier B.V.
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