Determination of the Diffusion Coefficients of Americium and Uranium in the Process of Their Sorption on a Solid-Phase Extractant Based on TODGA
—It has been shown that the sample with the highest kinetic characteristics can be determined from the calculation and comparison of the values of the diffusion coefficients of americium-241 and uranium on the example of their sorption from a model solution of liquid radioactive waste using various experimental samples of solid-phase extractant based on TODGA. The diffusion coefficients of americium-241 and uranium during their sorption have been calculated for three experimental samples of solid-phase extractant based on TODGA. The dependence of the reaction rate on the diffusion coefficients has been estimated. An increased sorption rate for americium-241 in comparison with uranium has been calculated from the dependence of the diffusion coefficients on the characteristics of the experimental samples of solid-phase extractant based on TODGA. Prototype no. 2 of solid-phase extractant based on TODGA with the highest kinetic characteristics has been determined from the calculation of the diffusion coefficients of americium-241 and uranium. The possibility of reducing the volume and costs of sorption experiments with preliminary determination of diffusion coefficients has been shown.