Thermodynamic correlations for adsorption from non-ideal solutions at the solid/solution interface

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Abstract
Adsorption and heats of wetting data have been obtained for the systems benzene + cyclohexane, benzene + carbon tetrachloride and carbon tetrachloride + cyclohexane using the adsorbents coconut shell charcoal and decolorizing charcoal. The results have been treated using a thermodynamic theory to see how far these systems conform with, or deviate from, the requirements of perfect and regular surface behaviour. These systems approximate to regular surface behaviour in general, although some discrepancies occur. For perfect surface behaviour, the systems do not obey the requirements of the theory over the whole concentration range but they show approximate correlations in a wide concentration range. The correlations for perfect surface behaviour may be fortuitous, but it may also be accounted for in terms of the “intermediate” nature of these systems which thus do not deviate significantly from perfect surface behaviour.

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