L. Ezzouhri
Department of Biology, Faculty of Sciences and Techniques – Tangier
University Abdelmalek Essaadi. B.P. 416,Tangier, Morocco
E. Castro
Department of Chemical, Environmental and Materials Engineering
University of Jaén, Campus Las Lagunillas, 23071 Jaén, Spain
M. Moya
Department of Chemical, Environmental and Materials Engineering
University of Jaén, Campus Las Lagunillas, 23071 Jaén, Spain
F. Espinola
Department of Chemical, Environmental and Materials Engineering
University of Jaén, Campus Las Lagunillas, 23071 Jaén, Spain
M. Guerrouj
National Agronomic Research Institut, Tangier, Morocco
B. Rossi
Department of Biology, Faculty of Sciences and Techniques – Tangier
University Abdelmalek Essaadi. B.P. 416,Tangier, Morocco
K. Lairini
Department of Biology, Faculty of Sciences and Techniques – Tangier
University Abdelmalek Essaadi. B.P. 416,Tangier, Morocco
Abstract
The biosorption of lead from artificial aqueous solution using Saccharomyces cerevisiae cells isolated from brewery wastewaters was investigated. The results showed, that both the initial pH and the initial concentration of lead in the aqueous solution have impact on the biosorption of Pb(II) by S. cerevisiae. Low pH resulted in a decrease in the biosorption capacity. At pH higher than 4.0, the biosorption of lead ions increase sharply and the highest lead uptake of 15.9 mg/g was obtained at pH ranging from 4.5 to 5.0 for 25 mg/l initial lead ions concentration. The amount of adsorption of Pb (II) per mass unit of biosorbent increased with the increase of the initial lead ions concentrations in the range 25–150 mg/l. The Lagergren and Ho’s models were applied to the experimental data and it was found that the overall adsorption process was best described by the pseudo second order kinetic.
Uptake of Lead by Saccharomyces Cerevisiae Isolated from Tangier Brewery Wastewater 669
The Pb (II) removal effeciency by caustic, ethanol and heat treated cells of S. cerevisiae was also studied. The result showed that among the treatment methods, the highest lead uptake value of 17.8 mg/g was obtained for ethanol treated yeast cells for 25 mg/l initial lead ions concentration.
Keywords: Saccharomyces cerevisiae; lead; biosorption; adsorption kinetics.
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