期刊
ACS NANO
卷 6, 期 9, 页码 7910-7919出版社
AMER CHEMICAL SOC
DOI: 10.1021/nn302293r
关键词
silver nanoparticles; gold nanoparticles; naturally occurring nanoparticles; reduction; dissolved organic matter; superoxide
类别
资金
- National Science Fund for Distinguished Young Scholars [21025729]
- National Basic Research Program of China [2010CB933502]
- National Natural Science Foundation of China [20977101, 20921063]
Despite the possible occurrence of metal nanoparticles in the environment due to the discharge of engineered nanoparticles and the natural transformation of metal ions into metal nanoparticles, little is known about the transformation mechanism, fates, behaviors, and effects of these nanoparticles in the environment. Here, we show that dissolved organic matter (DOM) in environmental waters can mediate the reduction of ionic Ag and Au to their metallic nanoparticles under natural sunlight, suggesting that this process may be general for metals with high reduction potential. We demonstrated that the reduction was mediated by superoxide from photoirradiation of the phenol group in DOM, and the dissolved O-2 significantly enhanced the formation of Ag nanoparticles. These results imply that previous knowledge about O-2-induced dissolution and its effect on persistence of Ag nanoparticles should be reconsidered in a sunlit DOM-rich aqueous environment. This study can also shed light on understanding possible natural sources of Ag and Au nanoparticles in the aquatic environment, which is possibly critical in the supergene enrichment of Ag and Au.
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