Dead biomass of Amazon yeast: A new insight into bioremediation and recovery of silver by intracellular synthesis of nanoparticles.
Marcia R SalvadoriRômulo Augusto AndoCláudio A Oller NascimentoBenedito CorrêaPublished in: Journal of environmental science and health. Part A, Toxic/hazardous substances & environmental engineering (2017)
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 (49.0 mg g-1). The nanoparticles were spherical, had an average size of 11.0 nm, 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.
Keyphrases
- electron microscopy
- silver nanoparticles
- quantum dots
- gold nanoparticles
- high resolution
- highly efficient
- visible light
- single molecule
- saccharomyces cerevisiae
- randomized controlled trial
- magnetic resonance
- molecular dynamics
- high throughput
- mass spectrometry
- molecular dynamics simulations
- computed tomography
- photodynamic therapy
- heavy metals
- risk assessment
- solid state
- simultaneous determination