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

文献类型： 外文期刊

第一作者： Zhang, Xiaoxia

作者： Zhang, Xiaoxia;Zhu, Mei;Li, Lingxiangyu;Xu, Zhenlan;Wimmer, Andreas;Zhang, Hangjun;Wang, Jiaojiao;Bao, Qibei;Gu, Zhouhang;Zeng, Lixi;Zeng, Lixi

作者机构：

期刊名称：ENVIRONMENTAL SCIENCE-NANO （ 影响因子：8.131； 五年影响因子：8.3 ）

ISSN： 2051-8153

年卷期： 2018 年 5 卷 12 期

页码：

收录情况： SCI

摘要： 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.

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