The preadsorption of n-nonane or n-undecane to various degrees of micropore filling, followed by immersion calorimetry into different liquids, has been examined for a set of well characterized active carbons. This approach provides a refined picture of the structural and chemical properties of the carbons, in particular the change in the hydrophilic character following the preadsorption of an organic vapour. The accessibility of triethylenediamine (TEDA), after preadsorption, is also examined.
The preadsorption of variable amounts of water, followed by the adsorption of nitrogen at 77 K or the immersion into water at 293 K has been examined for a set of well characterized active carbons. The results confirm the model proposed by Dubinin, suggesting that water forms clusters around primary centres, rather than filling the micropores by capillary condensation. The primary centres are occupied gradually, as adsorption proceeds. This is also suggested by immersion into benzene, which appears to displace completely the adsorbed water.
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