Abstract
Abstract The slow diffusion of plutonyl nitrate into a weak-base anion exchange resin has been investigated by sectioning and autoradiograping single ion exchange beads. There is clear evidence of a shell progressive diffusional effect in the early stages of the reaction, but more conventional diffusion is apparent after 336 hours of reaction. This could also be explained by Nernst-Planck diffusion of counterions with a large difference in mobility. The rate of uranium sorption by an aminophosphonic acid resin is controlled by diffusion within the ion exchange bead and the mechanism can be fitted to mathematical treatments of homogeneous diffusion and shell progressive or ash layer diffusion. The sorption of caesium by potassium copper(II) cyanoferrate is controlled by diffusion within the ion exchanger and the rate is virtually independent of particle size. Chemical reaction rate control at a moving boundary layer is the most satisfactory mathematical model and this is supported by a measured activation energy of 17.88 kcal/mol.
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