Abstract
A new, theoretical description of adsorption from ideal liquid binary mixtures on patchwise heterogeneous solid surfaces has been proposed. The overall, individual adsorption isotherm was approximated by an exponential equation of the Dubinin—Radushkevich (DR) type. The customary DR and Freundlich equations, which were earlier used for description of adsorption from solutions on heterogeneous solid surfaces, appeared to be special cases of the exponential adsorption isotherm. Using the method of Stieltjes transforms, distribution functions of the difference of adsorption energies of liquid mixture components were found, which corresponded with the equation of the individual isotherm. Also an independent method for determination of the total number of moles in the adsorbed layer has been proposed. The theoretical considerations have been illustrated by using the data available from the literature for seven different adsorption systems. The results obtained were compared with those obtained on using the Everett isotherm equation of the model for a perfect adsorbed monolayer.
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