Structure—Property Relationship of Permutite‐Like Amorphous Silicates, Na_x+2yM³⁺_xSi_1‐xO_2+y (M³⁺: Al, Mn, Fe, Y), for Ion‐Exchange Reactions.

Abstract

2005 Ion exchange V 1350Structure-Property Relationship of Permutite-Like Amorphous Silicates, Nax+2y Si1-xO2+y (M 3+ : Al, Mn, Fe, Y), for Ion-Exchange Reactions. -The title compounds are synthesized by simple precipitation at room temperature. The ion-exchange capacity of the compounds decreases in the order Al > Fe >Mn > Y. Additionally, the ion-exchange capacity increases with increasing Al concentration. It is suggested that the ion-exchange capacity value of these aluminosilicates depends on the amount of tetrahedrally coordinated Al. The high ion-exchange capacity and ability to regenerate exhibited by the 22.8% Al-permutite sample makes permutite an attractive material for the desalination of brackish waters. -(PLESS, J. D.; MAXWELL, R. S.; PHILIPS, M. L. F.; HELEAN, K. B.; AXNESS, M. Y.; NENOFF*, T. M.; Chem.