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Sulfidation processes of PVP-coated silver nanoparticles in aqueous solution: impact on dissolution rate.
Environ Sci Technol. 2011 Jun 15; 45(12):5260-6.ES

Abstract

Despite the increasing use of silver nanoparticles (Ag-NPs) in nanotechnology and their toxicity to invertebrates, the transformations and fate of Ag-NPs in the environment are poorly understood. This work focuses on the sulfidation processes of PVP-coated Ag-NPs, one of the most likely corrosion phenomena that may happen in the environment. The sulfur to Ag-NPs ratio was varied in order to control the extent of Ag-NPs transformation to silver sulfide (Ag₂S). A combination of synchrotron-based X-ray Diffraction (XRD) and Extended X-ray Absorption Fine Structure spectroscopy shows the increasing formation of Ag₂S with an increasing sulfur to Ag-NPs ratio. TEM observations show that Ag₂S forms nanobridges between the Ag-NPs leading to chain-like structures. In addition, sulfidation strongly affects surface properties of the Ag-NPs in terms of surface charge and dissolution rate. Both may affect the reactivity, transport, and toxicity of Ag-NPs in soils. In particular, the decrease of dissolution rate as a function of sulfide exposure may strongly limit Ag-NPs toxicity since released Ag⁺ ions are known to be a major factor in the toxicity of Ag-NPs.

Authors+Show Affiliations

Surface and Aqueous Geochemistry Group, Department of Geological & Environmental Sciences, Stanford University, Stanford, California 94305-2115, USA. clevard@stanford.eduNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't
Research Support, U.S. Gov't, Non-P.H.S.

Language

eng

PubMed ID

21598969

Citation

Levard, Clément, et al. "Sulfidation Processes of PVP-coated Silver Nanoparticles in Aqueous Solution: Impact On Dissolution Rate." Environmental Science & Technology, vol. 45, no. 12, 2011, pp. 5260-6.
Levard C, Reinsch BC, Michel FM, et al. Sulfidation processes of PVP-coated silver nanoparticles in aqueous solution: impact on dissolution rate. Environ Sci Technol. 2011;45(12):5260-6.
Levard, C., Reinsch, B. C., Michel, F. M., Oumahi, C., Lowry, G. V., & Brown, G. E. (2011). Sulfidation processes of PVP-coated silver nanoparticles in aqueous solution: impact on dissolution rate. Environmental Science & Technology, 45(12), 5260-6. https://doi.org/10.1021/es2007758
Levard C, et al. Sulfidation Processes of PVP-coated Silver Nanoparticles in Aqueous Solution: Impact On Dissolution Rate. Environ Sci Technol. 2011 Jun 15;45(12):5260-6. PubMed PMID: 21598969.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Sulfidation processes of PVP-coated silver nanoparticles in aqueous solution: impact on dissolution rate. AU - Levard,Clément, AU - Reinsch,Brian C, AU - Michel,F Marc, AU - Oumahi,Camella, AU - Lowry,Gregory V, AU - Brown,Gordon E, Y1 - 2011/05/20/ PY - 2011/5/24/entrez PY - 2011/5/24/pubmed PY - 2011/10/1/medline SP - 5260 EP - 6 JF - Environmental science & technology JO - Environ Sci Technol VL - 45 IS - 12 N2 - Despite the increasing use of silver nanoparticles (Ag-NPs) in nanotechnology and their toxicity to invertebrates, the transformations and fate of Ag-NPs in the environment are poorly understood. This work focuses on the sulfidation processes of PVP-coated Ag-NPs, one of the most likely corrosion phenomena that may happen in the environment. The sulfur to Ag-NPs ratio was varied in order to control the extent of Ag-NPs transformation to silver sulfide (Ag₂S). A combination of synchrotron-based X-ray Diffraction (XRD) and Extended X-ray Absorption Fine Structure spectroscopy shows the increasing formation of Ag₂S with an increasing sulfur to Ag-NPs ratio. TEM observations show that Ag₂S forms nanobridges between the Ag-NPs leading to chain-like structures. In addition, sulfidation strongly affects surface properties of the Ag-NPs in terms of surface charge and dissolution rate. Both may affect the reactivity, transport, and toxicity of Ag-NPs in soils. In particular, the decrease of dissolution rate as a function of sulfide exposure may strongly limit Ag-NPs toxicity since released Ag⁺ ions are known to be a major factor in the toxicity of Ag-NPs. SN - 1520-5851 UR - https://www.unboundmedicine.com/medline/citation/21598969/Sulfidation_processes_of_PVP_coated_silver_nanoparticles_in_aqueous_solution:_impact_on_dissolution_rate_ L2 - https://doi.org/10.1021/es2007758 DB - PRIME DP - Unbound Medicine ER -