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Equilibrium and Thermodynamic Studies on Adsorption of Cd2+ and Zn2+ using Brachystegia eurycoma Seed coat as Biosorbent

Author Affiliations

  • 1Department of Chemistry, Michael Okpara University of Agriculture Umudike, P.M.B 7267, Umuahia, Abia State, NIGERIA
  • 2 Department of Industrial Chemistry, Ebonyi State University, P.M.B. 053 Abakaliki, NIGERIA

Res.J.chem.sci., Volume 5, Issue (2), Pages 32-41, February,18 (2015)

Abstract

The potential of B.eurycoma seed coat as biosorbent for removing Cd2+ and Zn2+ from aqueous solutions has been studied. Batch adsorption experiments were carried out as function of pH, initial metal ion concentration and temperature. Maximum metal sorption was found to occur at pH 6.0 at initial concentration of 30 mg/L and at 300C. The maximum adsorption capacity of B.eurycoma corresponding to sites saturation was found to be 4.286 and 4.390 mg/g respectively for initial Cd2+and Zn2+ concentration of 30 mg/L at a temperature of 400 C. The results were analyzed by the Langmuir, Freundlich, Temkin and Dubinin–Radushkevich (D–R) isotherms using linearized correlation coefficient at different temperatures. Results showed that the Langmuir and Freundlich models gave the best interpretation to the equilibrium adsorption data for the Cd(II) and Zn(II) ions–B.eurycoma systems studied. The following thermodynamic parameters: ΔH, ΔS and ΔG were calculated and results obtained showed that the adsorption process was exothermic and spontaneous.

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