Adsorption and thermodynamic behavior of uranium on natural zeolite |
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Authors: | S Olmez Aytas S Akyil M Eral |
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Institution: | (1) Institute of Nuclear Sciences, Ege University, 35100 Bornova, Izmir, Turkey |
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Abstract: | Adsorptive behavior of natural clinoptilolite-rich zeolite from Balikesir deposites in Turkey was assessed for the removal
of uranium from aqueous solutions. The uranium uptake and cation exchange capacities of zeolite were determined. The effect
of initial uranium concentrations in solution was studied in detail at the optimum conditions determined before (pH 2.0, contact
time: 60 minutes, temperature: 20 °C). The uptake equilibrium is best described by Langmuir adsorption isotherm. Some thermodynamic
parameters (ΔH°, ΔS°, ΔG°) of the adsorption system were also determined. Application to fixation of uranium to zeolite was performed. The uptake
of uranium complex on zeolite followed Langmuir adsorption isotherm for the initial concentration (25 to 100 μg/ml). Thermodynamic
values of ΔG°, ΔS° and ΔH° found show the spontaneous and exothermic nature of the process of uranium ions uptake by natural zeolite.
This revised version was published online in August 2006 with corrections to the Cover Date. |
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