期刊
出版社
TAYLOR & FRANCIS INC
DOI: 10.1080/10934529.2017.1340754
关键词
Bioremediation; biosynthesis; dead biomass; intracellular; metal mine; nanoparticles; Rhodotorula mucilaginosa; silver; yeast
资金
- Company Vale S/A
- bank BNDES (Banco Nacional do Desenvolvimento)
- Fundacao de Amparo a Pesquisa do Estado de Sao Paulo (FAPESP) [2016/04364-5]
This investigation was undertaken to describe a natural process for the removal of silver and the simultaneous recovery of Ag/Ag2O nanoparticles by dead biomass of the yeast Rhodotorula mucilaginosa. The removal of silver ions from aqueous solution and the synthesis of Ag/Ag2O nanoparticles were analyzed based on physicochemical factors and equilibrium concentration, combined with transmission electron microscopy (TEM), scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS), X-ray photoelectron spectroscopy (XPS), and infrared spectroscopy (FTIR). A successful process for the synthesis of Ag/Ag2O nanoparticles was obtained, following the Langmuir isotherm model, showing a high biosorption capacity of silver (49.0mgg(-1)). The nanoparticles were spherical, had an average size of 11.0nm, were synthesized intracellularly and capped by yeast proteins. This sustainable protocol is an attractive platform for the industrial-scale production of silver nanoparticles and of a silver nanobiosorbent.
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