Ion-exchange resins may be considered to be a special class of solid porous adsorbents. As such, their activity will depend on the area of surface available for adsorption or ion-exchange, the accessibility to the adsorbate molecules, determined by the distribution of pore diameters or interstices within the resin matrix, and the activity of the surface.
The surface areas and porosities of ion-exchange resins have been measured in the dry state by gas adsorption techniques developed for rigid adsorbents. The results usually bear little relationship to their adsorptive capacity in solution.
Techniques for determining surface areas and porosities in solution, using model adsorbates, have been evaluated on adsorptive resins of the Amberlite XAD series (macroreticular non-ionic), and are being used to probe the structure of gel and macroreticular type ion-exchange resins.
Proceedings: CITS 1971
pdf download: CITS1971-335-349.pdf