Medium-property relationships and compensation effect in the adsorption of heteroaromatic compounds from aqueous acetonitrile solutions View Full Text


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Article Info

DATE

2014-12

AUTHORS

B. R. Saifutdinov

ABSTRACT

The thermodynamics of the adsorption of heteroaromatic compounds of the 1,3,4-oxadiazole and 1,2,4,5-tetrazine series from aqueous acetonitrile solutions was studied in Henry’s region under the conditions close to equilibrium using the dynamic method. The applicability of the adsorption retention models to the description of medium-property relationships at different temperatures was evaluated. The effect of the composition of the solution on the thermodynamic characteristics of adsorption was studied. The effect of the acetonitrile concen-tration on the enthalpy and entropy of adsorption cannot be described by simple plots, since it is determined by the nature of the adsorbate. At the same time, the Gibbs free energy change of adsorption is characterized by a monotonic dependence on the acetonitrile concentration. Linear relationships between changes in the enthalpy and entropy of adsorption of the same substance from water-acetonitrile media of different compositions were established. The character of these relationships is determined by the adsorbate nature and explains the dependence of its thermodynamic characteristics of adsorption on the solution composition. The compensation of the values of enthalpy and entropy changes in a series of the studied adsorbates measured for the constant composition of the solution was discovered. The concentration of acetonitrile significantly affects the character of this compensation. More... »

PAGES

2609-2619

References to SciGraph publications

  • 2010-01. Thermodynamics of sorption of 1,3,4-oxadiazoles and 1,2,4,5-tetrazines according to reversed phase high-performance liquid chromatography in RUSSIAN JOURNAL OF PHYSICAL CHEMISTRY A
  • 2013-11-08. Chromatography: Method of investigation of surface chemistry and interface processes in PROTECTION OF METALS AND PHYSICAL CHEMISTRY OF SURFACES
  • 2011-01-08. Spectral-chemometric and quantum-chemical study of the water-acetonitrile system in JOURNAL OF ANALYTICAL CHEMISTRY
  • 2009-01. The influence of the eluent composition on the retention of derivatives of some aromatic heterocyclic compounds in reversed-phase high-performance liquid chromatography in RUSSIAN JOURNAL OF PHYSICAL CHEMISTRY A
  • 1976-06. Statistical interpretation of enthalpy–entropy compensation in NATURE
  • 2011-07-08. Regularities of the sorption of cycloalkenyl-substituted thiophenes and 2,2′-bithiophenes from water-acetonitrile solutions on hexadecyl silica gel under conditions of high-performance liquid chromatography in RUSSIAN JOURNAL OF PHYSICAL CHEMISTRY A
  • 2013-03-02. Thermodynamic characteristics of adsorption of some 1,3,4-oxadiazoles and 1,2,4,5-tetrazines from water-acetonitrile solutions on phenyl-bonded silica gel in RUSSIAN JOURNAL OF PHYSICAL CHEMISTRY A
  • 2010-01. Laws of sorption of some aromatic heterocycles from solutions on nanoporous supercrosslinked polystyrene in RUSSIAN JOURNAL OF PHYSICAL CHEMISTRY A
  • 1991-04. Comparison of surface states of chemically modified silicas in aqueous acetonitrile and methanol in CHROMATOGRAPHIA
  • 2013-02-03. On the interrelation between the distribution constant and the retention factor in liquid chromatography in RUSSIAN JOURNAL OF PHYSICAL CHEMISTRY A
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