Behavior of Silver Species in Soil: Ag Nanoparticles vs. Ionic Ag.

Publisher: MDPI Country of Publication: Switzerland NLM ID: 100964009 Publication Model: Electronic Cited Medium: Internet ISSN: 1420-3049 (Electronic) Linking ISSN: 14203049 NLM ISO Abbreviation: Molecules Subsets: PubMed not MEDLINE; MEDLINE

Original Publication: Basel, Switzerland : MDPI, c1995-

Silver nanoparticles are one of the most commonly used forms of silver (Ag) in nanotechnology applications due to their antibacterial properties and electrical and thermal resistance. The increasing production and use of products containing nanoparticles has led to their release into and contamination of soil and water. This review summarizes the literature on the fate, behavior (adsorption/desorption, precipitation/oxidative dissolution, transformation), and transport/mobility of Ag forms in soils (Ag ⁺ ions and Ag nanoparticles-AgNPs). The behavior of Ag ⁺ /AgNPs in soil is a complex process. It depends on many factors, including the characteristics of the Ag forms (ions, nanoparticle size, ligand type used for coating, surface charge, initial Ag concentration), the soil properties (organic matter and clay mineral content, textural properties, point of zero charge, cation exchange capacity, surface functional groups), and the solute properties (pH-Eh, ionic strength, cation type, oxygen content). The binding of Ag ⁺ and AgNPs is significantly positively correlated with Al/Fe/Mn oxide and SOM content and depends on the surface charge of the minerals and CEC, which controls adsorption processes. Very important parameters to consider are the pH and Eh of the solution, which determine the durability of the ligands, the aggregation rate and the oxidation process of AgNPs, as well as the presence of sulfide and chloride and the Cl/Ag ratio, which determine the stability/mobility of Ag. Since AgNPs can be oxidized to Ag ⁺ ions during their life cycle, it is necessary to consider the behavior of both forms of Ag in soils. Understanding the transport and behavior of Ag in soil is essential for the environmental risk assessment and management of wastes containing Ag.

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UMO-2012/07/B/ST8/03753 National Science Center

Keywords: Fe (oxyhydr)oxides; adsorption; clay minerals; oxidative dissolution; sequential chemical extraction; silver forms; soil organic matter

Date Created: 20241217 Latest Revision: 20250104

20250114

PMC11643404

10.3390/molecules29235531

39683691