Effect of temperature and a weakly polar organic medium on water localization in slit-like pores of various sizes in microporous activated carbon |
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| Authors: | V V Turov V M Gun’ko O P Kozynchenko S R Tennison S V Mikhalovskii |
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| Institution: | 1.Chuiko Institute of Surface Chemistry,Kiev,Ukraine;2.School of Pharmacy and Biomolecular Sciences,University of Brighton,Brighton,UK;3.MAST Carbon International Ltd.,Guildford, Surrey,UK |
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| Abstract: | The joint adsorption of water and methane in pores of the synthetic carbon adsorbent with specific surface area of 3463 m2/g was studied by 1H NMR spectroscopy. It was shown that during adsorption of water and methane in pores of activated carbon AC86 under conditions
of low surface filling the adsorbate molecules are localized not only in micropores, but in mesopores as well, and are revealed
in the spectra as several signals with different values of the chemical shift. A substantial drop in the magnetic shielding
effect of the carbon surface was detected upon a reduction in temperature; this is explained by the presence of two energy
minima on the curves of the adsorption potential energy (close to the walls and in the center of pores) and allows the migration
of adsorbed molecules from the walls to the center of pores, which are characterized by a lower shielding effect. |
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