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Removal of Cadmium from Aqueous Solutions by Saccharomyces cerevisiae-Alginate System
Silvia Carolina Moreno Rivas1, Rosa Idalia Armenta Corral1, María Del Carmen Frasquillo Félix1
1Centro de Investigación en Alimentación y Desarrollo, A.C. Carretera Gustavo Enrique Astiazarán No. 46, Col. La Victoria, C.P. 83304 Hermosillo, Sonora, Mexico.
Abstract:
The aim of this study was to determine the Cd2+ removal capacity of a biosorbent system formed by Saccharomyces cerevisiae in calcium alginate beads. The adsorption of Cd2+ by a S. cerevisiae-alginate system was tested either by batch or fixed-bed column experiments. The S. cerevisiae-alginate system was characterized using dynamic light scattering (DLS, zeta potential), size, hardness, scanning electron microscopy (SEM), and Fourier-transform infrared spectroscopy. Beads of the S. cerevisiae-alginate system showed a spherical-elliptical morphology, diameter of 1.62 ± 0.02 mm, 96% moisture, negative surface charge (-29.3 ± 2.57 mV), and texture stability during storage at 4 °C for 20 days. In batch conditions, the system adsorbed 4.3 µg of Cd2+/g of yeast-alginate beads, using a Cd2+ initial concentration of 5 mg/L. Adsorption capacity increased to 15.4 µg/g in a fixed-bed column system, removing 83% of total Cd2+. In conclusion, the yeast-alginate system is an efficient option for the removal of cadmium at low concentrations in drinking water.
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