Sulfidation Processes of PVP-Coated Silver Nanoparticles in Aqueous Solution: Impact on Dissolution Rate
In: ISSN: 0013-936X, 2011
academicJournal
Zugriff:
PMID: 21598969 ; International audience ; 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.
Titel: |
Sulfidation Processes of PVP-Coated Silver Nanoparticles in Aqueous Solution: Impact on Dissolution Rate
|
---|---|
Autor/in / Beteiligte Person: | Levard, Clement ; Reinsch, Brian C. ; Michel, F. Marc ; Oumahi, Camella ; Lowry, Gregory V. ; Brown, Gordon E. ; Centre européen de recherche et d'enseignement des géosciences de l'environnement (CEREGE) ; Aix Marseille Université (AMU)-Institut national des sciences de l'Univers (INSU - CNRS)-Collège de France (CdF (institution))-Institut de Recherche pour le Développement (IRD)-Centre National de la Recherche Scientifique (CNRS)-Institut National de la Recherche Agronomique (INRA) ; Surface and Aqueous Geochemistry Group Stanford ; Advanced Light Source LBNL Berkeley (ALS) ; Lawrence Berkeley National Laboratory Berkeley (LBNL)-Lawrence Berkeley National Laboratory Berkeley (LBNL)-Stanford Synchrotron Radiation Lightsource (SSRL SLAC) ; SLAC National Accelerator Laboratory (SLAC) ; Stanford University-Stanford University-SLAC National Accelerator Laboratory (SLAC) ; Stanford University-Stanford University ; Stanford Synchrotron Radiation Lightsource (SSRL SLAC) |
Link: | |
Zeitschrift: | ISSN: 0013-936X, 2011 |
Veröffentlichung: | HAL CCSD ; American Chemical Society, 2011 |
Medientyp: | academicJournal |
DOI: | 10.1021/es2007758 |
Schlagwort: |
|
Sonstiges: |
|