Multi-walled carbon nanotubes modified with (3-aminopropyl)triethoxysilane for effective carbon dioxide adsorption

► Effective adsorbent for CO2 was developed through amine functionalization of MWCNTs. ► Adsorbent with good distribution of APTS were obtained from 5 h of reflux. ► The highest CO2 uptake of 75.4 mg CO2/g adsorbent was achieved.