Mechanism of coupled phosphate‑calcium modulation of nanoplastic transport in porous media: Role of solution chemistry and surface interactions
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Le résumé fourni par la source
The transport of nanoplastics in the environment is affected by anions (PO 4 3− , P) and cations (Ca 2+ , Ca). This study investigated the transport of polystyrene nanoplastics (PS) in two media (quartz sand and goethite-coated quartz sand (G-C sand)) under conditions of P/Ca co-existence, and in-depth study of the transport mechanism of PS in combination with techniques such as density function theory (DFT) calculations and molecular dynamics (MD). It was found that pH was an important factor affecting the transport of PS in quartz sand and G-C sand. At pH ≤ 6.0, P promoted the transport of PS in both media, whereas Ca showed inhibition. The adsorption of P and Ca altered the charge distribution on the surface of PS and both media. The extended Derjaguinee-Landauee-Verweyee-Overbeek (XDLVO) theory results revealed that PS transport in quartz sand was mainly subjected to electrostatic interactions, while PS transport in G-C sand was subjected to P/Ca bridging coordination in addition to electrostatic interactions. With pH > 6.0, Ca 5 (PO 4 ) 3 (OH) formed by P and Ca and heterogeneously aggregated with PS, and attached to the surfaces of quartz sand and G-C sand, which altered the charge properties of PS and both media, inhibiting the transport of PS in both media. The XDLVO theory, fourier transform infrared spectroscopy (FTIR), DFT, and MD simulations results suggested that the electrostatic attraction and complexation of Ca 5 (PO 4 ) 3 (OH) with PS and the two media were the main factors inhibiting the transport of PS in both media. This study was the first to illustrate the effect of P/Ca co-existence on the transport of PS in porous media and to analyze the mechanism of their interaction in the context of quantum theory.
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Le contrôle bibliographique ouvert
DOI retrouvé dans Crossref DOI retrouvé ; titre concordant.
- Titre Crossref
- Mechanism of coupled phosphate‑calcium modulation of nanoplastic transport in porous media: Role of solution chemistry and surface interactions
- Date Crossref
- 01/10/2025
- Éditeur
- Elsevier BV
- Type
- journal-article
Ce recoupement confirme des métadonnées liées au DOI. Il ne confirme ni la méthode ni les conclusions de l’étude, et il ne compte pas comme une seconde source scientifique indépendante.
Où se fait cette recherche
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South China University of Technology pays non établi dans la noticeUniversité ou école supérieure
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Ministry of Ecology and Environment pays non établi dans la noticeOrganisme public
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School of Environment and Energy pays non établi dans la noticeUniversité ou école supérieure
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Guangdong Engineering and Technology Research Center for Environmental Nanomaterials pays non établi dans la noticeStructure de recherche
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Guangdong Provincial Key Laboratory of Solid Wastes Pollution Control and Recycling pays non établi dans la noticeStructure de recherche
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The Key Lab of Pollution Control and Ecosystem Restoration in Industry Clusters pays non établi dans la noticeStructure de recherche
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South China Institute of Environmental Sciences pays non établi dans la noticeStructure de recherche
South China University of Technology, Ministry of Ecology and Environment et School of Environment and Energy, avec 4 autres affiliations.
Une affiliation ne permet pas de déduire la nationalité d’un auteur.