Multicomponent ion-exchange equilibria in chabazite zeolite.

摘要

Efficient design ion-exchange columns, using Ionsiv IE-96 chabazite zeolite, for the decontamination of process wastewater that contains ppB levels of Sr-90 and Cs-137 requires a detailed study of binary and multicomponent ion-exchange equilibria. Experimental isotherms were acquired for Ca--Na, Mg--Na, Sr--Na, Cs--Na, Sr--Cs--Na, Ca--Mg--Na, Sr--Ca--Mg--Na, Cs--Ca--Mg--Na, and Sr--Cs--Ca--Mg--Na comparing batch and column experimental approaches. Binary isotherms obtained by the batch technique were most successfully fitted with a modification of the Dubinin-Polyani equilibrium model. Prediction of the multicomponent equilibria from binary data will require more sophisticated modeling. 15 refs., 5 figs., 3 tabs. (ERA citation 15:032203)