Immobilization of Lead(II) Ions on Coal A Thermodynamic View
Faculty of Science, University of Ostrava, Ostrava
Immobilization of Pb(II) ions from aqueous solutions on two types of coals and activated carbon was investiga¬ted at 30, 60 and 80 °C. Based on the thermodynamic ana¬lysis of the experimental data, changes in Gibbs energy, enthalpy and entropy of the adsorption were evaluated. The calculated values of the adsorption enthalpy were compared with Pb(II) adsorption heats determined experimentally using calorimetric measurements. Thus, noteworthy differences between the calculated and measured va¬lues were found for coal while for the activated carbon, the values were comparable. The discrepancy may be due to different mechanisms of the Pb(II) immobilization.
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