Heterogeneous ion-exchange

If Q is the total moles of adsorbed charge associated with the i class of exchanger (cf. Eq. 5.7b), then 

This complicated equation can be transformed further by invoking the constraint in Eq. 5.67, but its principal implication can be appreciated more simply by examining the example of homovalent exchange (a = b = 1)  

This point can be seen directly in the special case of Eq. 5.70a when n = 2  

This equation shows once again that is a weighted average of the with composition-dependent weights. Since Em - 1 EB1, Eq. 5.72 may be rewritten in the form 

Pl excl Bl + P2 exc2 B2 — b( cxc1 + exc2) (Pl Bl exc2 + P2 B2 excl) 

---

First, the solute transport in a porous filter (membrane) separating two solutions at different concentrations or electric potentials is likely to be dominated by electro-osmotic circulation as compared to molecular electrodiffusion in the pores. An accurate calculation of the circulation seems desirable. In particular, the observations upon the highly performing composite heterogeneous ion-exchange membrane [13], formed by casting a thin... 

Two types of membranes may eontains fillers hydrophobie membranes (usually polydimelhoxysiloxane filled with zoelites) and heterogeneous ion-exchange membranes which may contain various surface modified inorganic materials. 

Heterogeneous. Ion-exchange resin particles dispersed in polymer film. 

A.S. Tombalakian, Phenomenological coefficients for volume flow across an ion-exchange membrane, J. Phys. Chem., 1968, 72, 1566 F. Gonzalez-Caballero and F.J. de las Nieves, On the relation between the electrokinetic behavior of heterogeneous ion-exchange membranes and their structural characteristics, J. Membr. Sci., 1983, 16, 225. 

J. Schauer and L. Brozova. Heterogeneous ion-exchange membranes based on sulfonatedpoly(l,4-phenylene sulfide) and linear polyethylene Preparation, oxidation stability, methanol permeability and electrochemical properties. J. Membr. Set, 250(1-2) 151-157, March 2005. 

Oren, Y, Ferger, V. and Linder, C. 2004. Highly conductive ordered heterogeneous ion-exchange membranes. 239 17-26. 

---