Abstract
Ion-exchange kinetic equations are derived for an irreversible sorption system with a linear driving force coordinate approximation. The final equations utilize batch-type sorption data to determine the controlling resistance and the effective diffusivities. Experimental data for sorption of Na-Novobiocin on Dowex 21K (particle-diffusion controlled) and Neomycin sulfate on IRC-50 (both liquid film- and particle-diffusion controlled) are given as illustration. A general type linear equation is derived to plot solution concentration change against time. A dimensionless number which is a measure of particle diffusion contribution in the sorption kinetics is defined and used to obtain a straight line. From the slope of the plot effective diffusivities may be calculated.
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