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Abstract
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The adsorption capacity of CO2 and the economic estimation of synthesized activated carbons (ACs) from
Persian Ironwood biomass were evaluated in the present study. In addition, the effect of different
impregnation ratios of activation agents, including KOH and H3PO4, and various carbonization temperatures on the properties of synthesized ACs was examined by different analyses. The obtained results
revealed that BET surface area (SBET) and micropore volume of synthesized ACs were enhanced with an
increase in the impregnation ratio of the precursor to KOH. Moreover, the synthesized AC by KOH
activation with an impregnation ratio of 1:3 (precursor: activating agent), and a carbonization temperature of 1073 K demonstrated the higher SBET (1935.8 m2/g), micropore volume percentage (about 98%),
and CO2 adsorption (5.05 mmol/g) at 1 bar and 303 K. Considering the thermodynamic parameters, the
dominant mechanism for CO2 uptake was physisorption, spontaneous, and exothermic in nature.
Furthermore, based on the annual production of 900,000 kg, the estimated capital costs for AC by KOH
activation and AC by H3PO4 activation would be $1.65 and $1.58 per kg, respectively.
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