Mechanism for sulfidation of silver nanoparticles by copper sulfide in water under aerobic conditions
文献类型： 外文期刊
作者： Zhang, Xiaoxia 1 ; Xu, Zhenlan 2 ; Wimmer, Andreas 3 ; Zhang, Hangjun 4 ; Wang, Jiaojiao 4 ; Bao, Qibei 5 ; Gu, Zhouha 1 ;
作者机构： 1.Zhejiang Sci Tech Univ, Sch Sci, Hangzhou 310018, Zhejiang, Peoples R China
2.Zhejiang Acad Agr Sci, Key Lab Pesticide Residue Detect, Inst Qual & Stand Agroprod, Minist Agr, Hangzhou 310021, Zhejiang, Peoples R China
3.Tech Univ Munich, Dept Chem, D-85748 Garching, Germany
4.Hangzhou Normal Univ, Coll Life & Environm Sci, Hangzhou 310036, Zhejiang, Peoples R China
5.Ningbo Acad Sci & Technol Inspect & Quarantine, Ningbo 315100, Zhejiang, Peoples R China
6.Zhejiang Sci Tech Univ, Sch Life Sci, Hangzhou 310018, Zhejiang, Peoples R China
7.Jinan Univ, Sch Environm, Guangzhou 510632, Guangdong, Peoples R China
8.Jinan Univ, Guangdong Key Lab Environm Pollut & Hlth, Guangzhou 510632, Guangdong, Peoples R China
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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