This study investigates the synthesis and characterization of activated porous carbon derived from sawdust for CO₂ capture. The activated carbons were synthesized by carbonizing sawdust at temperatures ranging from 700 to 1100 °C and then activating them using CO₂. The optimal conditions were found to be carbonization at 1000 °C, resulting in an activated carbon with a hierarchical and microporous structure, characterized by a surface area of 1651.34 m²/g, a pore volume of 0.69 cm³/g, and a pore size of <1.76 nm. This activated carbon exhibited a CO₂ adsorption uptake of 9.2 mmol/g at 25 °C and 1 bar, and a CO₂/N₂ selectivity of 40.2 at the same conditions. The material demonstrated excellent recyclability, maintaining over 98% of its initial adsorption capacity after 10 cycles. These findings highlight the potential of this low-cost and sustainable activated carbon for practical CO₂ capture applications.This study investigates the synthesis and characterization of activated porous carbon derived from sawdust for CO₂ capture. The activated carbons were synthesized by carbonizing sawdust at temperatures ranging from 700 to 1100 °C and then activating them using CO₂. The optimal conditions were found to be carbonization at 1000 °C, resulting in an activated carbon with a hierarchical and microporous structure, characterized by a surface area of 1651.34 m²/g, a pore volume of 0.69 cm³/g, and a pore size of <1.76 nm. This activated carbon exhibited a CO₂ adsorption uptake of 9.2 mmol/g at 25 °C and 1 bar, and a CO₂/N₂ selectivity of 40.2 at the same conditions. The material demonstrated excellent recyclability, maintaining over 98% of its initial adsorption capacity after 10 cycles. These findings highlight the potential of this low-cost and sustainable activated carbon for practical CO₂ capture applications.