Journal
MATERIALS
Volume 14, Issue 16, Pages -Publisher
MDPI
DOI: 10.3390/ma14164763
Keywords
biosorption; rhenium; copper; molybdenum; yeast
Categories
Funding
- Russian Foundation for Basic Research (RFBR) [[18-29-25023 MK]]
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The yeast Saccharomyces cerevisiae biomass was utilized for efficient removal of rhenium and accompanying elements from various systems. The biosorption process showed high removal efficiencies for rhenium, molybdenum, and copper ions under different experimental conditions, validating yeast biomass as a promising biosorbent for metal removal.
Yeast Saccharomyces cerevisiae biomass was applied for rhenium and accompanying elements (copper and molybdenum) removal from single- and multi-component systems (Re, Re-Mo, Re-Cu, and Re-Mo-Cu). Yeast biomass was characterized using X-ray diffraction, scanning electron microscopy, and Fourier transform infrared spectroscopy. The effects of biosorption experimental parameters such as solution pH (2.0-6.0), rhenium concentration (10-100 mg/L), time of interaction (5-120 min), and temperature (20-50 degrees C) have been discussed in detail. Maximum removal of rhenium (75-84%) and molybdenum (85%) was attained at pH 2.0, while pH 3.0-5.0 was more favorable for copper ions removal (53-68%). The Langmuir, Freundlich, and Temkin isotherm models were used to describe the equilibrium sorption of rhenium on yeast biomass. Langmuir isotherm shows the maximum yeast adsorption capacities toward rhenium ions ranged between 7.7 and 33 mg/g. Several kinetic models (pseudo-first-order, pseudo-second-order, and Elovich) were applied to define the best correlation for each metal. Biosorption of metal ions was well-fitted by Elovich and pseudo-first-order models. The negative free energy reflected the feasibility and spontaneous nature of the biosorption process. Saccharomyces cerevisiae biomass can be considered as a perspective biosorbent for metal removal.
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