Influence of Concentration, Surface Charge, and Natural Water Components on the Transport and Adsorption of Polystyrene Nanoplastics in Sand Columns

Article Article scientifique Article Influence of Concentration, Surface Charge, and Natural Water Components on the Transport and Adsorption of Polystyrene Nanoplastics in Sand Columns eng 2024-03-15 2024-03-15 author Hul Gabriela Jolanta 0000-0002-7836-3739 852482 author Okutan Hande 0000-0003-1321-1459 402528 author Le Coustumer Philippe 0000-0001-6504-6526 author Ramseier Gentile Stéphan author Zimmermann Stéphane author Ramaciotti Pascal author Perdaems Pauline author Stoll Serge 0000-0003-3158-4208 29148 Forel Communs (FOREL) 529 10.3390/nano14060529 38535675 2079-4991 PMC10974996 https://www.mdpi.com/2079-4991/14/6/529 <p>Information about the influence of surface charges on nanoplastics (NPLs) transport in porous media, the influence of NPL concentrations on porous media retention capacities, and changes in porous media adsorption capacities in the presence of natural water components are still scarce. In this study, laboratory column experiments are conducted to investigate the transport behavior of positively charged amidine polystyrene (PS) latex NPLs and negatively charged sulfate PS latex NPLs in quartz sand columns saturated with ultrapure water and Geneva Lake water, respectively. Results obtained for ultrapure water show that amidine PS latex NPLs have more affinity for negatively charged sand surfaces than sulfate PS latex NPLs because of the presence of attractive electrical forces. As for the Geneva Lake water, under natural conditions, both NPL types and sand are negatively charged. Therefore, the presence of repulsion forces reduces NPL’s affinity for sand surfaces. The calculated adsorption capacities of sand grains for the removal of both types of NPLs from both types of water are oscillating around 0.008 and 0.004 mg g−1 for NPL concentrations of 100 and 500 mg L−1, respectively. SEM micrography shows individual NPLs or aggregates attached to the sand and confirms the limited role of the adsorption process in NPL retention. The important NPL retention, especially in the case of negatively charged NPLs, in Geneva Lake water-saturated columns is related to heteroaggregate formation and their further straining inside narrow pores. The presence of DOM and metal cations is then crucial to trigger the aggregation process and NPL retention.</p> NOM Aggregation Mobility Nanoplastics Porous media Retention Straining Dewey 550 Dewey 333.7-333.9 SSIGE/SVGW/FOWA Services Industriels de GenÃ¨ve 18 Institut des sciences de l'environnement 0DB 41 Département F.-A. Forel des sciences de l'environnement et de l'eau 153 false 755 Environmental Physical Chemistry Nanomaterials 14 6 35748ab3-92d1-415a-95c4-9d774e59041a Article (Published version) Public Article_scientifique_from_unpaywall.pdf 5176827 application/pdf CC BY-4.0 2b2a6be369456de7e5d5869fe09c9a67e0dbe9e06a9cf3b42183acb891b907a2 openAccess Centres et instituts / Institut des sciences de l'environnement Faculté des sciences / Section des sciences de la Terre et de l'Environnement / Département F.-A. Forel des sciences de l'environnement et de l'eau

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Influence of Concentration, Surface Charge, and Natural Water Components on the Transport and Adsorption of Polystyrene Nanoplastics in Sand Columns	Nanomaterials			2024	117	78

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