Keywords
ion
exchange
alkaline metal ions
stability constants
How to Cite
Abstract
The porous mixed oxide SiO 2 /TiO 2 /Sb 2 O 5 obtained by the sol-gel processing method presented
a good ion exchange property and a high exchange capacity towards the Li + , Na + and K + ions. In the H + /
M + ion exchange process, the H + / Na + could be described as presenting an ideal character. The ion
exchange equilibria of Li + and K + were quantitatively described with the help of the model of fixed
tetradentate centers. The results of simulation evidence that for the H + / Li + exchange the usual situation
takes place: the affinity of the material to the Li + ions is decreased with increasing the degree of ion
exchange. On the contrary, for K + the effects of positive cooperativity, that facilitate the H + / K + exchange,
were revealed.
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