The effect of the nature of binary water–organic solvents on thermodynamic characteristics of adsorption of aromatic compounds on hyper-cross-linked polystyrene

Abstract

Using high-performance liquid chromatography under conditions close to equilibrium, adsorption has been investigated for a series of aromatic compounds from water–acetonitrile, water–methanol, and water–isopropyl alcohol solutions on hyper-cross-linked polystyrene with the degree of cross linking of 500%. The principles of the effect of the nature of binary water–organic solvents on thermodynamic characteristics of adsorption of the studied substances on hyper-cross-linked polystyrene have been determined. The role of intermolecular interactions, which are realized in bulk solution and interface, in the adsorption of aromatic compounds from their maximum diluted water–organic solutions on hyper-cross-linked polystyrene has been discussed. The compensation effect upon adsorption on hyper-cross-linked polystyrene individually from water–acetonitrile solution and various water–alcohol solutions has been discovered. The existence of linear dependences between the differences of Gibbs energy upon adsorption from water–organic solutions on hyper-cross-linked polystyrene has been shown.