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Activated carbon AC was treated with Kmn04 and the treated AC was used to be impregnated with iron oxide. The ratio of 0.1 M KMnO 4 treatment on AC to the 0.1 M iron sulfate precursor (0.1KMnO 4 :0.1Fe) showed the most efficient adsorbent with an adsorption capacity of 108.60 mg/g. The CO 2 adsorption isotherm at 25 °C was assessed with the adsorption isotherm model found that the Freundlich model to be the best fit which implies the multilayer adsorption onto heterogeneity surface. The adsorbent was used to perform CO 2 adsorption at 30, 40, 50 and 70 °C in which the optimum adsorption temperature was at 30 °C. The decrease in adsorption capacity with increasing temperature indicates that a physisorption process takes place. The kinetic data for CO 2 adsorption at different temperatures were well fitted to the pseudo-second-order kinetic. The adsorption was near to the chemisorption process based on the activation energy of 39.8 kJ/mol. It might be due to the weak interaction between CO 2 and AC and strong bonding between CO 2 and iron oxide. The adsorption capacity insignificantly reduced by 3.5% after four cycles showed practically efficient in CO 2 capture. [Display omitted] • A sorbent was synthesized by a ratio of KMnO 4 treated on AC towards iron oxide loading. • The most efficient adsorbent for CO 2 capture was 0.1KMnO 4 :0.1 Fe. • Freundlich model showed the best fit to the CO 2 adsorption isotherm at 25 °C. • The pseudo-second-order kinetic fit better with activation energy of 39.8 kJ/mol. [ABSTRACT FROM AUTHOR]