Polyethyleneimine-functionalized Biomass-derived Adsorbent Beads for Carbon Dioxide Capture under Ambient Conditions

Abstract A chitosan-based adsorbent functionalized by polyethyleneimine has been prepared using a freeze-drying method. The adsorbent showed a CO2 adsorption capacity of 2.38 mmol g−1 at 333 K and 15 kPa of CO2. Furthermore, the adsorption capacity increased up to 3.61 mmol g−1 in the presence of water vapor. This biomass-derived material is, therefore, a potential low-cost and efficient adsorbent for CO2.