Considering pore size distribution of adsorbent particles to be bidispersed and assuming diffusion within the particles in series from macro- to micro-pores and vice versa, theoretical equations of fixed-bed breakthrough curves for a linear adsorption isotherm system are derived and intraparticle diffusion resistance for two cases is given. Adsorption of Kr-85 on activated carbon of several particle sizes with different amounts of FeCl3 deposition was studied to assertain the applicability of the derived equations and resistances of both macro- and micro-pore diffusion were also evaluated. The difference of diffusion resistances from steady-state and from dynamic method is discussed.
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Kawazoe et al. (1975) studied this question.