Abstract
Thermodynamic characteristics of the adsorption of benzene and its derivatives on the surface of a porous graphite-like Hypercarb adsorbent from binary polar eluents have been experimentally determined under the conditions of equilibrium HPLC at various temperatures. The retention on Hypercarb columns is generally maintained by non-specific intermolecular interactions with the flat graphite-like surface and depends on the size of their molecular area. The contributions of various functional groups to the heat and entropy of adsorption were determined. The influence of solvation effects on the values of adsorption parameters was demonstrated. The replacement of methanol in the mobile phase composition with acetonitrile leads to an increased influence of the solvatation effects, while for the water-acetonitrile eluent, there were no any observed correlations of parameters of the adsorption on Hypercarb from a water-methanol medium with the data acquired on gas phase adsorption on graphite. The entropy values of adsorbates in their solvated state have been for the first time determined for eluents of the different polarities and compared with the entropy values for the state of pure liquid, which allowed us to clarify the nature of solvatation of the considered compounds in the polar eluent. Using the adsorption of compounds at issue as an example, the effect of enthalpy-entropy compensation was investigated, and the values of compensation temperatures were estimated.
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This work was financially supported by the Russian Foundation for Basic Research (Project No. 16-43-630634 p_a) and by the Ministry of Science and Higher Education of the Russian Federation within the framework of the main part of the State Assignment to Samara State Technical University (“Thermodynamics of intermolecular interactions in systems possessing 2D- and 3D-types of structural selectivity”, Assignment No. 4.6328.2017/8.9).
Published in Russian in Izvestiya Akademii Nauk. Seriya Khimicheskaya, No. 5, pp. 0909–0919, May, 2020.
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Yashkin, S.N., Yashkina, E.A., Svetlov, D.A. et al. Thermodynamic characteristics of the adsorption of benzene derivatives from water—organic eluents on porous graphite-like adsorbent under conditions of equilibrium HPLC. Russ Chem Bull 69, 909–919 (2020). https://doi.org/10.1007/s11172-020-2848-x
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DOI: https://doi.org/10.1007/s11172-020-2848-x