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| - Kinetics of Salicylic Acid Adsorption on Activated Carbon
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| - The adsorption and desorption of salicylic acid from water solutions was investigated in HPLCmicrocolumns packed with activated carbon. The adsorption isotherm was obtained by the step-up frontalanalysis method in a concentration range of 0−400 mg/L and was well fitted with the Langmuir equation.The investigation of rate aspects of salicylic acid adsorption was based on adsorption/desorption columnexperiments where different inlet concentrations of salicylic acid were applied in the adsorption phase anddesorption was conducted with pure water. The concentration profiles of individual adsorption/desorptioncycles data were fitted using several single-parameter models of the fixed-bed adsorption to assess theinfluence of different phenomena on the column behavior. It was found that the effects of axial dispersionand extraparticle mass transfer were negligible. A rate-determining factor of fixed-bed column dynamicswas the kinetics of pore surface adsorption. A bimodal kinetic model reflecting the heterogeneous characterof adsorbent pores was verified by a simultaneous fit of the column outlet concentration in four adsorption/desorption cycles. The fitted parameters were the fraction of mesopores and the adsorption rate constantsin micropores and mesopores, respectively. It was shown that the former rate constant was an intrinsicone whereas the latter one was an apparent value due to the effects of pore blocking and diffusionalhindrances in the micropores.
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