C. Constantopoulou et al., THORIUM EQUILIBRIA WITH THE SODIUM FORM OF CLINOPTILOLITE AND MORDENITE, Journal of radioanalytical and nuclear chemistry, 178(1), 1994, pp. 143-151
A study has been performed in order to examine the ion exchange behavi
or of tetravalent thorium ions using natural sodium clinoptilolite and
mordenite. The free energy values, DELTAG0, were calculated and found
to be 3.33 kJ/g eq for the Th/Na-CLI system, and for Th/Na-MOR 3.94 k
J/g eq. Despite the fact that the overall preference of the zeolites i
s for the sodium ions,thorium uptake was quite significant for mordeni
te. covering 30% of its theoretical exchange capacity at the equilibri
um point, while for clinoptilolite only 10% was occupied.