Adsorption of phenol, chlorophenols, and dihydroxybenzenes onto unfunctionalized polymeric resins at temperatures from 294.15 K to 318.15 K

The Surface excess for the adsorption of phenol, 2-chlorophenol, 4-chlorophenol, 2,4-dichlorophenol, 2,6-dichlorophenol, 2,4,6-trichlorophenol, 1,2-dihydroxybenzene, and 1,3-dihydroxybenzene from aqueous solution onto unfunctionalized polystyrene and polymethacrylate resins cross-linked with divinylbenzene (Lewatit VP-OC 1163, Amberlite XAD-4, Serdolite PAD I, II, and III, and Supelcogel TPR-100, respectively) at temperatures from 294.15 K to 318.15 K has been determined using the chromatographic method of frontal analysis. For a prediction of adsorption equilibria for phenol + water systems onto polymeric adsorbents, the fluid phase concentration is normalized to the solubility of the phenols in water. Isotherms of the Redlich-Peterson type with characteristic parameters for different polymers were fitted to the adsorption data (surface excess versus normalized concentration). The experimental data were correlated with-a standard deviation of 1.1%; adsorption equilibria were predicted within 2%.