Equilibrium and Kinetics Analysis of CO2 Adsorption on Waste Ion-exchange Resin-based Activated Carbon

The equilibrium and kinetics of CO2 adsorption on waste ion-exchange resin-based activated carbon were investigated. Three adsorption isotherm models and four kinetic models were utilized to analyze the equilibrium and kinetic data. Sips model and Avrami model are the best ones to describe the equilibrium and kinetics, respectively. The isosteric heats of adsorption of CO2 and N-2 were calculated according to the Sips model. The separation factor of CO2/N-2, calculated by LAST-Sips model, decreases with the surface coverage increasing. The adsorption rate constant of Avrami model increases with the CO2 concentration increasing and reduces with the temperature increasing. The activation energies of CO2 adsorption are negative, due to the decrease of the reaction rate with the temperature increasing. And the activation energies of CO2 adsorption on CA are a bit smaller than that of PA, but the difference is not obvious. (C) 2017 Taiwan Institute of Chemical Engineers. Published by Elsevier B.V. All rights reserved.