Description and estimation of adsorption from multicomponent aqueous solutions of dissociating organic substances on activated carbons

摘要

The general theoretical description of adsorption from multicomponent dilute aqueous solutions of weak organic electrolytes on solid surfaces is discussed. In the approach, the effect of solutionpHand ionic strength, and adsorbent energetic heterogeneity is taken into account. The presented model allows to estimate adsorption values in multicomponent systems by using the parameters characterizing single-solute adsorption data. The theoretical discussion is illustrated using new experimental adsorption data for two-component systems consisting of benzoic and salicylic acids over the wide range ofpHand equilibrium concentrations. The results of adsorption prediction are in good agreement with experiment.