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Transformations of citrate and Tween coated silver nanoparticles reacted with Na₂S.
Sci Total Environ. 2015 Jan 01; 502:344-53.ST

Abstract

Silver nanoparticles (Ag NPs) are susceptible to transformations in environmental and biological media such as aggregation, oxidation, dissolution, chlorination, sulfidation, formation/replacement of surface coatings following interaction with natural organic matter (NOM). This paper investigates the impact of surface coating and Suwannee River fulvic acid (SRFA) on the transformations and behavior of Ag NPs (citrate coated and Tween coated; cit-Ag NPs and Tween-Ag NPs, respectively), following reaction with different concentrations of Na2S solution (as a source of sulfide species, H2S and HS(-)). These transformations and the dominant mechanisms of transformations were investigated using UV-vis and scanning transmission electron microscopy coupled with electron energy loss spectroscopy. Here, we have shown that Ag NP surface coating impacts their dissolution following dilution in ultrahigh purity water, with higher extent of dissolution of Tween-Ag NPs compared with cit-Ag NPs. Tween-Ag NPs are susceptible to dissolution following their sulfidation at low S/Ag molar ratio. Suwannee River fulvic acid (SRFA) slows down the dissolution of Tween-Ag NPs at low sulfide concentrations and reduces the aggregation of cit-Ag NP in the presence of sodium sulfide. Sulfidation appears to occur by direct interaction of sulfide species with Ag NPs rather than by indirect reaction of sulfide with dissolved Ag species subsequent to dissolution. Furthermore, the sulfidation process results in the formation of partially sulfidized Ag NPs containing unreacted (metallic) subgrains at the edge of the NPs for Tween-Ag NPs in the presence of high sulfide concentration (2000nM Na2S), which occurred to less extent at lower Na2S concentration for Tween-Ag NPs and at all concentrations of Na2S for cit-Ag NPs. Thus, sulfidized Ag NPs may preserve some of the properties of the Ag NPs such as their potential to shed Ag(+) ions and their toxic potential of Ag NPs.

Authors+Show Affiliations

Center for Environmental Nanoscience and Risk, Department of Environmental Health Sciences, Arnold School of Public Health, University of South Carolina, Columbia, SC 29028, USA.School of Biochemistry, University of Bristol, Bristol BS8 1TD, United Kingdom.School of Geography, Earth and Environmental Sciences, University of Birmingham, Birmingham B15 2TT, United Kingdom.School of Physics and Astronomy, University of Birmingham, Birmingham B15 2TT, United Kingdom.Center for Environmental Nanoscience and Risk, Department of Environmental Health Sciences, Arnold School of Public Health, University of South Carolina, Columbia, SC 29028, USA; School of Geography, Earth and Environmental Sciences, University of Birmingham, Birmingham B15 2TT, United Kingdom.

Pub Type(s)

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

Language

eng

PubMed ID

25262296

Citation

Baalousha, M, et al. "Transformations of Citrate and Tween Coated Silver Nanoparticles Reacted With Na₂S." The Science of the Total Environment, vol. 502, 2015, pp. 344-53.
Baalousha M, Arkill KP, Romer I, et al. Transformations of citrate and Tween coated silver nanoparticles reacted with Na₂S. Sci Total Environ. 2015;502:344-53.
Baalousha, M., Arkill, K. P., Romer, I., Palmer, R. E., & Lead, J. R. (2015). Transformations of citrate and Tween coated silver nanoparticles reacted with Na₂S. The Science of the Total Environment, 502, 344-53. https://doi.org/10.1016/j.scitotenv.2014.09.035
Baalousha M, et al. Transformations of Citrate and Tween Coated Silver Nanoparticles Reacted With Na₂S. Sci Total Environ. 2015 Jan 1;502:344-53. PubMed PMID: 25262296.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Transformations of citrate and Tween coated silver nanoparticles reacted with Na₂S. AU - Baalousha,M, AU - Arkill,K P, AU - Romer,I, AU - Palmer,R E, AU - Lead,J R, Y1 - 2014/09/28/ PY - 2014/08/01/received PY - 2014/09/11/revised PY - 2014/09/11/accepted PY - 2014/9/29/entrez PY - 2014/9/30/pubmed PY - 2015/2/11/medline KW - Citrate KW - Dissolution KW - Silver nanoparticles KW - Sulfidation KW - Transformation KW - Tween SP - 344 EP - 53 JF - The Science of the total environment JO - Sci Total Environ VL - 502 N2 - Silver nanoparticles (Ag NPs) are susceptible to transformations in environmental and biological media such as aggregation, oxidation, dissolution, chlorination, sulfidation, formation/replacement of surface coatings following interaction with natural organic matter (NOM). This paper investigates the impact of surface coating and Suwannee River fulvic acid (SRFA) on the transformations and behavior of Ag NPs (citrate coated and Tween coated; cit-Ag NPs and Tween-Ag NPs, respectively), following reaction with different concentrations of Na2S solution (as a source of sulfide species, H2S and HS(-)). These transformations and the dominant mechanisms of transformations were investigated using UV-vis and scanning transmission electron microscopy coupled with electron energy loss spectroscopy. Here, we have shown that Ag NP surface coating impacts their dissolution following dilution in ultrahigh purity water, with higher extent of dissolution of Tween-Ag NPs compared with cit-Ag NPs. Tween-Ag NPs are susceptible to dissolution following their sulfidation at low S/Ag molar ratio. Suwannee River fulvic acid (SRFA) slows down the dissolution of Tween-Ag NPs at low sulfide concentrations and reduces the aggregation of cit-Ag NP in the presence of sodium sulfide. Sulfidation appears to occur by direct interaction of sulfide species with Ag NPs rather than by indirect reaction of sulfide with dissolved Ag species subsequent to dissolution. Furthermore, the sulfidation process results in the formation of partially sulfidized Ag NPs containing unreacted (metallic) subgrains at the edge of the NPs for Tween-Ag NPs in the presence of high sulfide concentration (2000nM Na2S), which occurred to less extent at lower Na2S concentration for Tween-Ag NPs and at all concentrations of Na2S for cit-Ag NPs. Thus, sulfidized Ag NPs may preserve some of the properties of the Ag NPs such as their potential to shed Ag(+) ions and their toxic potential of Ag NPs. SN - 1879-1026 UR - https://www.unboundmedicine.com/medline/citation/25262296/Transformations_of_citrate_and_Tween_coated_silver_nanoparticles_reacted_with_Na₂S_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0048-9697(14)01345-X DB - PRIME DP - Unbound Medicine ER -