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Title: Equilibrium, kinetic and thermodynamic studies on biosorption of copper and zinc from mixed solution by Erythrina variegata orientalis leaf powder
Authors: Bai, M Tukaram
Komali, K
Venkateswarlu, P
Keywords: Erythrina variegata orientalis;Biosorption;Cu-Zn mixture;Kinetics;Isotherms;Themodynamic parameters
Issue Date: Sep-2010
Publisher: NISCAIR-CSIR, India
Abstract: Present investigation is undertaken to explore the feasibility of biosorption for the removal of copper and zinc from aqueous Cu-Zn solution using Erythrina variegata orientalis leaf powder. Batch investigations indicate that biosorption of Cu-Zn mixture is gradually increased with increase in pH from 1 to 6 (38.25 to 44.77 mg/g). The biosorption of Cu-Zn mixture is increased from 86.3 to 91.9% (86.27 to 45.93 mg/g) with increase in biosorbent dosage from 1 to 2 g/L. 91.9% (45.93 mg/g) of Cu-Zn mixture is removed from the solution containing 100 mg/L of Cu and Zn agitated with 2 g/L of 45 mm size adsorbent for an equilibrium agitation time of 30 min. The experimental data are well described by Langmuir (R2=0.99), Freundlich (R2=0.98) and Temkin (R2=0.98) isotherms. The sorption studies follow the second order rate expression (R2 = 0.99) and rate constant is 9.39 g/mg-min. The biosorption is found to increase with decrease in temperature of the solution. From the thermodynamic parameters, sorption is found to be exothermic and reversible.
Page(s): 346-355
ISSN: 0975-0991 (Online); 0971-457X (Print)
Appears in Collections:IJCT Vol.17(5) [September 2010]

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