SORPTION AND DIFFUSION OF CRESOLS ON BONDED BETA-CYCLODEXTRIN SILICA STATIONARY-PHASE

The adsorption of cresol isomers on a bonded beta-cyclodextrin-silica stationary phase has been studied. The adsorption equilibrium constant s and kinetic parameters are determined by pulse chromatography. The c alculated effective intraparticle diffusivity is in the order of 10(-9 )-10(-8) cm2/s in the temperature range of 283-323 K. The effective di ffusivities have the same order as predicted values except at the temp erature of 323 K. It is found that a restricted diffusion accompanied by the phenomena of adsorption of solutes occurs within adsorbent pore s. A correlation between adsorption equilibrium and kinetic properties is proposed for the present system, showing that the effective intrap article diffusivities are influenced by the adsorption equilibrium con stants.