Adsorptive Thermodynamic Properties and Kinetics of trans-1,2-Cyclohexandiol onto AB-8 Resin

AB-8 resin was used as an adsorbent for the removal of trans-1,2-cyclohexandiol (CHD) from aqueous solutions. Batch experiments were carried out to investigate the effect of contact time and temperature on sorption efficiency. The adsorptive thermodynamic properties and kinetics of CHD from water onto AB-8 resin were studied. The Langmuir and Freundlich isotherm models were employed to discuss the adsorption behavior. Thermodynamic parameters such as ΔGθ, ΔHθ and ΔSθ were calculated. The results indicate that the equilibrium data are perfectly represented by Langmuir isotherm model. Thermodynamic study reveals that it is an exothermic process in nature and mainly physical adsorption enhanced by chemisorption with a decrease of entropy process. The kinetics of CHD adsorption is well described by the pseudo second-order model. The adsorbed CHD can be eluted from AB-8 resin by 5% ethanol aqueous solution with 100% elution percentage.