Abstract
The objective of this work is to develop approximate formulas for calculating the uptake of a spherical adsorbent with nonlinear adsorption and diffusion subjected to a step change in the surface concentration. Parallel pore and surface diffusion as well as concentration dependence of surface diffusivity are considered in the intraparticle mass transfer. The investigations on the accuracy of the developed formulas will be performed using practical adsorption systems with quite different diffusion and adsorption characteristics. Comparisons of the present formulas with other related ones reported in the literature will be also carried out.
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