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.

中文翻译：

---

平衡HPLC条件下多孔类石墨吸附剂吸附水中苯衍生物的热力学特性-有机洗脱液

在平衡 HPLC 条件下，在不同温度下，通过实验确定了苯及其衍生物在多孔石墨状 Hypercarb 吸附剂表面从二元极性洗脱液吸附的热力学特性。Hypercarb 色谱柱上的保留通常通过与扁平石墨样表面的非特异性分子间相互作用来维持，并取决于其分子面积的大小。测定了各种官能团对吸附热和熵的贡献。证明了溶剂化效应对吸附参数值的影响。用乙腈代替流动相组合物中的甲醇会增加溶剂化效应的影响，而对于水-乙腈洗脱液，水-甲醇介质中 Hypercarb 的吸附参数与石墨上气相吸附获得的数据没有任何观察到的相关性。首次测定了不同极性洗脱液的吸附质在溶剂化状态下的熵值，并与纯液体状态下的熵值进行了比较，这使我们能够阐明所考虑化合物在溶剂化状态下的溶剂化性质。极性洗脱液。以化合物的吸附为例，研究了焓熵补偿的影响，并估计了补偿温度的值。首次测定了不同极性洗脱液的吸附质在溶剂化状态下的熵值，并与纯液体状态下的熵值进行了比较，这使我们能够阐明所考虑化合物在溶剂化状态下的溶剂化性质。极性洗脱液。以化合物的吸附为例，研究了焓熵补偿的影响，并估计了补偿温度的值。首次测定了不同极性洗脱液的吸附质在溶剂化状态下的熵值，并与纯液体状态下的熵值进行了比较，这使我们能够阐明所考虑化合物在溶剂化状态下的溶剂化性质。极性洗脱液。以化合物的吸附为例，研究了焓熵补偿的影响，并估计了补偿温度的值。