Abstract
A study has been performed in order to examine the iron exchange behavior of tetravalent thorium ions using natural sodium clinoptilolite and mordenite. The free energy values, ΔG0, were calculated and found to be 3.33 kJ/g eq for the Th/Na-CLI system, and for Th/Na-MOR 3.94 kJ/g eq. Despite the fact that the overall preference of the zeolites is for the sodium ions, thorium uptake was quite significant for mordenite, covering 30% of its theoretical exchange capacity at the equilibrium point, while for clinoptilolite only 10% was occupied.
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