期刊
ENVIRONMENTAL SCIENCE-NANO
卷 6, 期 6, 页码 1674-1687出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c9en00138g
关键词
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资金
- Guangdong University of Technology Hundred Talent Program [1143-220418134]
- National Natural Science Funds for Distinguished Young Scholars [41425015]
- National Natural Science Foundation of China [41807349]
- innovation team project of Guangdong Provincial Department of Education [2017KCXTD012]
Sulfidation of silver nanoparticles (Ag-NPs) readily occurs in both urban sewage systems and sulfur-rich natural environments with formation of silver sulfide nanoparticles (Ag2S-NPs). It is essential to understand the transformation and fate of Ag2S-NPs in order to fully evaluate environmental impact of Ag-NPs. The review focuses on the formation and transformation of Ag2S-NPs from both thermodynamic and kinetic perspectives, particularly (i) the formation mechanism of Ag2S in various environmental scenarios, (ii) redox transformation of Ag2S caused by oxidation of S(-ii) and (iii) effects of environmental matrices on the formation and transformation processes. In most cases, sulfidation of Ag-NPs causes a dramatic decrease in their toxicity due to the extremely low solubility of Ag2S, potentially restraining their short-term environmental impact. However, the transformation of Ag2S-NPs with potential release of Ag+ and in situ formation of Ag-0 and Ag-0/Ag2S-NPs hetero-nanostructures may possibly increase the toxicity. Mechanistically-based kinetic modeling has been proposed here to quantitatively describe the rate and extent of the transformation of Ag2S-NPs, with such models of value, at least, in validating proposed transformation mechanisms of Ag2S-NPs and, at best, in predicting their transformation behaviors under realistic environmental conditions.
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