Jump to main content
Jump to site search


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

Author affiliations

Abstract

Silver nanoparticles (Ag-NP) can readily react with dissolved sulfides in anoxic waters to form silver sulfide nanoparticles (Ag2S-NP) via a Ag–Ag2S core–shell pathway; however, the questions remain as to whether and how Ag-NPs are transformed into Ag2S-NP by metal sulfides in water under aerobic conditions. We thus adopted copper sulfide nanoparticles (CuS-NP) with different surface charges as a model metal sulfide to coexist with Ag-NP in water under aerobic conditions. The Ag-NP underwent sulfidation by CuS-NP, where Ag2S-NP were observed, along with measurable levels of dissolved copper but negligible SO42− in water. The sulfidation of Ag-NP by CuS-NP was dependent on the molar Ag/S ratio and natural organic matter and inorganic salts depressed Ag-NP sulfidation. Moreover, the oxygen-dependent dissolution of Ag-NP was demonstrated to be very important for Ag-NP sulfidation. On the basis of experimental data, we propose that Ag-NP sulfidation by CuS-NP in water under aerobic conditions proceeds through the following reactions: oxygen-dependent dissolution releases silver ions, followed by cation exchange reactions with CuS-NP to form Ag2S-NP. This study illustrates the potential mechanism for Ag-NP sulfidation by CuS-NP in water under aerobic conditions and sheds light on potential transformations of Ag-NP in the environment.

Graphical abstract: Mechanism for sulfidation of silver nanoparticles by copper sulfide in water under aerobic conditions

Back to tab navigation

Supplementary files

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, Advance Article
  •   Request permissions

    Mechanism for sulfidation of silver nanoparticles 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, Advance Article , DOI: 10.1039/C8EN00651B

Search articles by author

Spotlight

Advertisements