Interpretation of experimental results of ion exchange kinetics by comparison with mathematical models is often ambiguous. More conclusive results are obtained if such comparisons are supplemented by direct observation of transient concentration profiles in the solid phase. This report presents autoradiography and light microscopy studies of equatorial sections of resin beads in the course of chloride-sulfate forward and reverse exchange and sulfate isotopic exchange on Kastel A 102 (weak-base) and Amberlite IRA 458 (strong-base) anion exchangers at high solution concentration (1.8 N, pH 3). The results confirm the expected rate control by intraparticle diffusion. In one case, i.e., reverse exchange on Amberlite IRA 458, evidence of sodium sulfate precipitation in the resin was found.
|Titolo:||Ion exchange kinetics on anion resins. Concentration profiles and transient phenomena in the solid phase|
|Data di pubblicazione:||1988|
|Digital Object Identifier (DOI):||10.1016/0167-6989(88)90135-3|
|Appare nelle tipologie:||1.1 Articolo in rivista|