Use of silica nanopowder to accelerate CO2 sorption by Ca(OH)2

► Synthetic CO2 adsorbent is made by dry mixing of Ca(OH)2 and nanosilica powders. ► Acting as dispersant for Ca(OH)2, nanosilica enhances contact efficiency between CO2 and Ca(OH)2. ► Addition of nanosilica helps increase CO2 adsorption rate during fast carbonation stage.