Gas-Chromatographic Studies of the Interaction between Water and Methanol Molecules and the Surface of Carbon Materials |
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Authors: | Yu I Tarasevich S V Bondarenko A I Zhukova |
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Institution: | (1) Institute of Colloid Chemistry and Chemistry of Water, Ukrainian National Academy of Sciences, 42 Vernadsky Avenue, Kyiv (Kiev), 03680, Ukraine |
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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
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. |
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Keywords: | hydrophobic model sorbents hydrophilic centres carbon materials water methanol adsorption isotherm gas chromatography interaction energy cluster adsorption |
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