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Gas-Chromatographic Studies of the Interaction between Water and Methanol Molecules and the Surface of Carbon Materials
Authors:Yu I Tarasevich  S V Bondarenko  A I Zhukova
Institution:(1) Institute of Colloid Chemistry and Chemistry of Water, Ukrainian National Academy of Sciences, 42 Vernadsky Avenue, Kyiv (Kiev), 03680, Ukraine
Abstract:The gas-chromatographic method is used to study the interaction of water and methanol molecules with active hydrophilic centres existing at the surface of thermally exfoliated graphite and graphitized thermal carbon black. The concentration of carboxyl and phenol hydroxyl groups at the surface of these sorbents is determined, and heats of adsorption of the studied molecules are shown to be $$\bar Q_a= 40-39$$ and 28−25 kJ/mol, respectively. It is also shown that adsorption of water at the hydrophilic centres at lowest relative pressure values takes place with formation of clusters consisting of n = 2 water molecules.
Keywords:hydrophobic model sorbents  hydrophilic centres  carbon materials  water  methanol  adsorption isotherm  gas chromatography  interaction energy  cluster adsorption
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