Amines immobilized double-walled silica nanotubes for CO2 capture

► Fabrication of double-walled silica nanotube (DWSNT). ► Primary, secondary, tertiary, di-, and tri-aminosilanes on DWSNT for CO2 capture. ► Maximum CO2 adsorption capacity and bonding-affinity for various amine types on DWSNT. ► This work demonstrates the amine type apt for the CO2 capture.