Environmental friendliness and high adsorption capacity are important properties of CO 2 adsorbents. Bio-based metal–

organic framework (bioMOFs) materials off er notable benefi ts for CO 2 capture. Amino acids like L -glutamic acid (Glu)

and L-aspartate (Asp) are employed as ligands for the synthesis of bioMOFs, Asp-Cu and Glu-Cu. Characterization results

confi rmed that Asp-Cu and Glu-Cu possessed tertiary amine and secondary amine structures, respectively. The adsorption

capacities of Glu-Cu and Asp-Cu were up to 253 mg·g −1 and 277 mg·g −1 at 1 bar CO 2 pressure and 190 mg·g −1 and

223 mg·g −1 at 0.15 bar CO 2 pressure. The CO 2 adsorption properties of bioMOFs were comprehensively evaluated under

various conditions, including temperature, water content, SO 2 concentration, and other compositions. Adsorption data were

fi tted well with the pseudo-fi rst-order kinetics and Weber-Morris intraparticle diff usion model. The kinetic studies revealed

that a small amount of water signifi cantly accelerated the pseudo-fi rst-order kinetic constants, whereas excess water vapor

greatly hindered the intra-diff usion constants of CO 2 . The presence of SO 2 led to a decrease in the adsorption capacity of both

MOFs due to rapid reactions occurring with active sites on the MOF surface. Furthermore, these bioMOFs were easily recovered

and regenerated for at least 20 cycles. The primary CO 2 adsorption mechanism involved catalytic hydration reactions

on Asp-Cu, while chemical adsorption occurred on Glu-Cu. Both mechanisms were accompanied by physical adsorption.