F. Mijangos et M. Diaz, KINETIC-ANALYSIS OF A BIMETALLIC ION-EXCHANGE SYSTEM BY MICROSCOPIC MEASUREMENT OF THE MOVING BOUNDARIES, Journal of colloid and interface science, 164(1), 1994, pp. 215-222
Two different colored layers surrounding the central core have been ob
served during the simultaneous uptake of copper and cobalt onto an imi
nodiacetic-type ion exchange resin that was initially in the sodium fo
rm. By measuring their width it is possible to calculate metal load on
the basis of the local equilibrium assumption by using an equilibrium
model for multimetallic systems. A kinetic pseudohomogeneous model ha
s been developed which considers two successive mechanisms: first, dif
fusion of metal ions through the reacted layer, and second, metal-meta
l displacement from the solid phase. (C) 1994 Academic Press, Inc.