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Mechanism for sulfidation of silver nanoparticle by copper sulfide in water under aerobic conditions

Abstract

Silver nanoparticle (Ag-NP) can readily react with dissolved sulfide in anoxic waters to form silver sulfide nanoparticle (Ag2S-NP) via an Ag-Ag2S core-shell pathway, yet whether and how Ag-NP transforms into Ag2S-NP by metal sulfide in water under aerobic conditions? We thus adopted copper sulfide nanoparticle (CuS-NP) with different surface charge as a model metal sulfide to coexist with Ag-NP in water under aerobic conditions. Ag-NP could undergo sulfidation by CuS-NP, wherein Ag2S-NP was observed, along with measurable levels of dissolved copper yet negligible SO42- in water. Sulfidation of Ag-NP by CuS-NP was dependent on the molar Ag/S ratio, and natural organic matter and inorganic salts would depress Ag-NP sulfidation. Moreover, oxygen-dependent dissolution of Ag-NP was demonstrated to be very important for Ag-NP sulfidation. On the basis of experimental data, we proposed that Ag-NP sulfidation by CuS-NP in water under aerobic conditions proceeded through the following reactions: oxygen-dependent dissolution released silver ions, followed by cation exchange reactions with CuS-NP to form Ag2S-NP. This study illustrated the potential mechanism for Ag-NP sulfidation by CuS-NP in water under aerobic conditions, and shed light on potential transformations of Ag-NP in the environment.

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Publication details

The article was received on 16 Jun 2018, accepted on 12 Oct 2018 and first published on 12 Oct 2018


Article type: Paper
DOI: 10.1039/C8EN00651B
Citation: Environ. Sci.: Nano, 2018, Accepted Manuscript
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    Mechanism for sulfidation of silver nanoparticle by copper sulfide in water under aerobic conditions

    X. Zhang, Z. Xu, A. Wimmer, H. Zhang, J. Wang, Q. Bao, Z. Gu, M. Zhu, L. Zeng and L. Li, Environ. Sci.: Nano, 2018, Accepted Manuscript , DOI: 10.1039/C8EN00651B

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