The Adsorption of Benzoic Acid on High-crosslinked Resin

The static and dynamic adsorption behavior of benzoic acid on high-crosslinked polystyrene resin ZH-01 and macroporous resin Amberlite XAD-4 were compared.The effect of temperature and initial concentration on equilibrium time and adsorption rate was stadied.From the static equilibrium adsorption behavior and the thermodynamic properties the adsorption mechanism was discussed.The dynamic adsorption data showed that the adsorption of benzoic acid on the high-crosslinked polystyrene resin was stronger than that on Amberlite XAD-4.288 ~ 318K and in the concentration scope of the study,the adsorption equilibrium of benzoic acid on ZH-01 and XAD-4 complied with the Freundlich and Langmuir adsorption isotherm equations.The adsorption process is exothermic,so lower temperature is in favor of the adsorption.The enthalpy and free energy changes in adsorption were calculated,and a reasonable explanation was given.