Enhancement of CO2 adsorption on nanoporous chromium terephthalate (MIL-101) by amine modification

Abstract

Carbon dioxide (CO₂) adsorption on a standard metal-organic framework MIL-101 and a pentaethylenehexamine modified MIL-101 (PEHA-MIL-101) are investigated and compared in this study. The adsorbent samples were characterized by XRD, FT-IR and nitrogen adsorption-desorption isotherms analysis. CO₂ adsorption capacity was measured by a volumetric method. MIL-101 and PEHA-MIL-101 exhibited CO₂ adsorption capacities of 0.85 and 1.3 mmolCo₂/g_adsorbent at 10 bar and 298 K, respectively. It is observed that CO₂ adsorption capacity was fairly improved about 50% after amine modification.