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    STUDIA CHEMIA - Issue no. 3 / 2008  
         
  Article:   COPPER BIOSORPTION ON A STRAIN OF SACCHAROMYCES CEREVISIAE ISOTHERM EQUILIBRIUM AND KINETIC STUDY.

Authors:  ADINA GHIRIȘAN, SIMION DRĂGAN, VASILE MICLĂUȘ. 		 
       
         
  Abstract:   In the present work, biosorption of copper ions from aqueous solutions on a strain of Saccharomyces cerevisiae, collected from the waste of a brewing industry, was studied in batch system for a better understanding of biosorption isotherm equilibrium, as well as biosorption kinetics. The influence of different sorbent dosages on the sorption of copper ions was investigated. Freundlich and Langmuir isotherm models were used for interpreting the copper biosorption equilibrium and the isotherm constants (i.e., for Freundlich isotherm model, k = 10.454 and n = 3.017) were determined by experimental data. Freundlich adsorption isotherm (R2 = 0.9642) was found to be more suitable than the Langmuir isotherm (R2 = 0.8709) for correlation of equilibrium biosorption data. Kinetics of biosorption for copper ions was investigated using the first- and second-order models. The kinetic constants were also determined. Second-order kinetics (R2 = 0.9937 – 0.9996) was found to fit the experimental data better than the first-order model (R2 = 0.743).

Keywords: copper, biosoption, Saccharomyces cerevisiae, Freundlich and Langmuir models 		 
         
     
         
         
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