Description of excess adsorption isotherms and a priori calculations of adsorption equilibriums of binary nonelectrolyte solutions on microporous adsorbents

Using our own experimental data and data available from the literature, it was shown that the system of equations derived in the framework of the Ono-Kondo-Aranovich model for adsorption from solutions on active carbons with slitlike micropores quantitatively describes all types of experimental excess adsorption isotherms of components of binary nonelectrolyte solutions. It was noted that the energy parameters of the model provide a physically reliable characterization of the adsorption system. In this case, the greater the difference in the molecular size of solution components (i.e., the greater the difference between the model and real adsorption systems), the greater the deviation of the monolayer capacity determined in terms of the model from that determined by independent methods. An additional similarity equation was proposed for the calculated and reference characteristic adsorption curves of solution components on active carbons and zeolites. The use of the equation increases the accuracy of the a priori calculations of corresponding equilibriums within the framework of the method of characteristic curves. A criterion was proposed for choosing the form of the equation describing the "property of similarity." In this case, all of the parameters of the used equations are determined only from data on the adsorption of individual components of the mixture.