期刊
CHINESE CHEMICAL LETTERS
卷 31, 期 7, 页码 1970-1973出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.cclet.2019.11.030
关键词
Gold granule; Gold nanoparticle; Dissolved organic matter; Photochemical reduction; Mineralization
资金
- National Natural Science Foundation of China [21777178]
- Key Projects for Frontier Sciences of the Chinese Academy of Sciences [QYZDB-SSWDQC018]
- CAS Interdisciplinary Innovation Team [JCTD-2018-04]
- National Young Top-Notch Talents [W03070030]
- Youth Innovation Promotion Association of the Chinese Academy of Sciences [2016037]
The biogeochemical transformation of gold (Au), i.e. its dissolution and re-precipitation, is critical in supergene transport of Au and formation of Au granules. Besides biogenic reduction, the formation Au granules can also be driven by chemical processes. Previous studies have showed the formation of Au nanoparticles (AuNPs) from ionic Au(III) can be mediated by dissolved organic matter under sunlight. In this letter, we further demonstrated that these AuNPs can further slowly (in years) grow into visible Au granules. Different sized nano-flower and fractal dendrite-like branched gold structures (from tens of nanometres to over 100 mu m) were observed in the Au granule sample. This growth of AuNPs into visible Au granules may play a critical role in the supergene mineralization and enrichment of secondary Au and drive the biogeochemical cycle of Au. (C) 2019 Chinese Chemical Society and Institute of Materia Medica, Chinese Academy of Medical Sciences. Published by Elsevier B.V. All rights reserved.
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