Abstract
Some peculiarities in the absorption behaviour of phenol on the polymeric macroreticular adsorbent Amberlite XAD-4 (used in waste water treatment) are reported. First, the adsorption capacity increases slightly after each subsequent adsorption/washing cycle. Secondly, during the adsorption process the phenol concentration in the effluent first reaches a maximum, decreases and then increases again until it reaches the concentration of the influent. The pore-space structure of the adsorbent is analysed using mercury porosimetry and B.E.T. isotherm data. The peculiarities are explained with reference to the bidisperse character of the pore-size distribution.
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