Biosorption of cadmium and lead ions by ethanol treated
waste baker’s yeast biomass -yayın

The biosorption of cadmium and lead ions from artificial aqueous solutions using waste baker’s yeast biomass was investigated.
The yeast cells were treated with caustic, ethanol and heat for increasing their biosorption capacity and the highest metal uptake
values (15.63 and 17.49 mg g1 for Cd2þ and Pb2þ, respectively) were obtained by ethanol treated yeast cells. The effect of initial
metal concentration and pH on biosorption by ethanol treated yeast was studied. The Langmuir model and Freundlich equation
were applied to the experimental data and the Langmuir model was found to be in better correlation with the experimental data. The
maximum metal uptake values (qmax, mgg1) were found as 31.75 and 60.24 for Cd2þ and Pb2þ, respectively. Competitive biosorption
experiments were performed with Cd2þ and Pb2þ together with Cu2þ and the competitive biosorption capacities of the yeast
biomass for all metal ions were found to be lower than in non-competitive conditions.
Yekta Goksungur, Sibel Uren, Ulgar Guvenc
Department of Food Engineering, Engineering Faculty, Ege University, 35100 Bornova, _Izmir, Turkey
Received 10 February 2003; received in revised form 15 March 2003; accepted 10 April 2003

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