Reversing Effect of Hydrostatic Pressure on Liquid-Phase Adsorption
A simple experimental procedure for the detection of hydrostatic pressure effect onto liquid-phase adsorption was developed and applied to some adsorption systems of aromatic compounds from aqueous solution onto an activated carbon fiber adsorbent. This experiment needs only a few hundred of atmospheric pressure. The technique we developed clearly showed the definite existence of the pressure effect in such simple adsorption systems as aromatic compounds from aqueous solution onto a carbon adsorbent. Further, the reversal of pressure effect against the equilibrium concentration was found. This led to a varying molar volume of adsorbate against amount adsorbed. The result could be interpreted with compressive effect by the potential of pore walls.
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