On replacing M2+ ion in the NaY zeolite, the driving force is the increase in entropy. If we replace same valency ion with NaY then what will be the driving force?
ion exchange is always about moving towards an equilibrium state determined by binding strength and ion concentration. This is the base for binding of specific ions even when present at low concentration and regeneration by flushing with concentrated solutions of ions with less specific binding.
Hi beside the driving force ,There are many factors which help to ions introduce or exchange in the zeolite.For example the size of cations can be effect on this subect.NH4 + with the same charge with Na+has big radius and show srong bonding with hydroxyl group of zeolite and the exchange by Na+.
Therefore the size of cation and ablity of good interaction with zeolite framework help to ion exchange.
In the case of ion exchange, the driving force is the difference in concentration i.e. difference in chemical potential.
Here
I think the reason for this is the ion exchange process (proton or sodium ion) resulting from the movement of ions in the solution and the resultant difference in the resulting charge across the two ends according to the state of equilibrium generated according to the reaction conditions between the Bronsted formula and the Lewis formula on the alumina or silica parts in the zeolite body (water exchange: The proton and the hydroxyl) and their bonding to reach a state of final physical-chemical equilibrium.
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