Abstract
Single-component gas-phase adsorption isotherms for a commercial activated carbon fiber, KF-1500, are determined for acetone, diethyl ether and methanol at 273.15, 298.15 and 323.15 K and for water at 298.15 K by a gravimetric method. No hysteresis was found for the three solvent gases, but a reproducible hysteresis loop was observed for water. The isosteric heats of adsorption for the three organic solvent gases decrease with increase in adsorption in a low-surface coverage region while they increase in a high-loading region. Dubinin’s characteristic curve method and the multi-site occupancy model were applied to correlate the adsorption data. The latter model represents the experimental isotherms of the organic solvent gases satisfactorily in the region of surface coverage greater than 0.1.
