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IJCT Vol.16(1) [January 2009] >


Title: Removal of Cu and Pb ions from aqueous solutions by electric furnace slag: Kinetic and thermodynamic aspects
Authors: Ćurković, Lidija
Trgo, Marina
Mioč, Alenka Rastovčan
Medvidović, Nediljka Vukojević
Keywords: Copper
Lead
Electric furnace slag
Diffusion
Thermodynamic parameters
Issue Date: Jan-2009
Publisher: CSIR
Abstract: Electric furnace slag, instead of deposition as a non-toxic metallurgical waste material, can be used as a valuable secondary raw material in many industrial processes. In this paper, removal of copper and lead ions from aqueous solutions by sorption on electric furnace slag (EFS) has been investigated. Experiments were performed at three temperatures of 23, 40 and 55ºC. The results of sorption kinetics are tested by kinetic model that describes intraparticle diffusion, and diffusion coefficients have been calculated. Diffusion rate of both systems increases with temperature, in dependence of time is constant for copper ions, while for lead decreases. The energy of activation (Ea), activation enthalpy (ΔH*), activation entropy (ΔS*) and free energy of activation (ΔG*) have been calculated based on kinetic data. Values of Ea characterize binding of lead and copper ions on EFS as activated chemisorption, whereas positive values of ΔH*, ΔG* and negative values of ΔS* describe process as endothermic, nonspontaneous and without changes in the structure of the solid particle. The studies showed that this low cost waste material could be used as an efficient sorbent material for the removal of lead and copper from aqueous solutions.
Page(s): 84-88
ISSN: 0971–457X
Source:IJCT Vol.16(1) [January 2009]

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