Journal of the Serbian Chemical Society 2012 Volume 77, Issue 4, Pages: 549-561
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Cadmium biosorption by baker’s yeast in aqueous suspension
Tálos Katalin, Pernyeszi Tímea, Majdik Cornelia, Hegedűsova Alzbeta, Páger Csilla
The biosorption of cadmium from artificial aqueous solutions using native
baker’s yeast was investigated. The highest metal uptake value was 110 mg g-1
in a suspension of 0.3 g L-1. The effect of pH, initial cadmium
concentration, adsorption time and biosorbent dosage on biosorption by
baker’s yeast was studied. The maximum biosorption capacity of cadmium by
yeast was observed at pH 6.0. The adsorption equilibrium was reached within
sixty minutes and the sorption process followed pseudo second-order kinetics.
Cadmium biosorption isotherms were determined in the cadmium concentration
range of 10-500 mg L-1 at pH 6 in a suspension of 0.3 g L-1. For evaluation
of biosorption equilibrium Langmuir and Freundlich equations were applied to
the experimental data.
Keywords: cadmium, baker’s yeast, biosorption, pH, kinetics, isotherm, biosorbent dosage