Relation between adsorption of CO_2 on activated carbon and its micropore volume

Characterization of activated carbon has been carried out by N2,CO2 adsorption and iodine adsorption value.It is shown that both iodine adsorption value and pore structure parameters based on BET,D-R model for N2 adorption isotherms can not be used to reflect the adsorption property of CO2 in activated carbon.The D-A model results obtained from CO2 adsorption isotherms are not suitable for characterizing the adsorption of CO2 on activated carbon,either.The results of DFT model for CO2 adsorption isotherms showed that the adsorption of CO2 on activated carbon is in the ultramicropore.The micropore volumes from DFT model are consistent with CO2 adsorption isotherms.DFT model based on CO2 adsorption isotherms can be used to analyze the adsorption of CO2 perfectly.