Electrodeionization 2: The migration of nickel ions absorbed in a flexibleion-exchange resin

The removal of nickel ions from a low cross-linked ion-exchange resin using an applied electrical potential gradient was studied. The potential gradie nt across a bed of ion-exchange particles, in which nickel ions were absorb ed, was varied by two methods. One involved a change of cell voltage across beds of constant width, the other a change of bed width at constant cell v oltage. In this way, various characteristics concerning the electrodialytic regeneration of a bed of ion-exchange particles in the nickel form were as certained. The diffusion coefficient, current efficiency and migration rate of nickel in the bed are discussed. It is shown that the current efficienc y for the removal of nickel is nearly one hundred percent when the bed is i n the nickel form, and that the rate of regeneration is proportional to the cell voltage.