Amine-bearing mesoporous silica for CO2 removal from dry and humid air

This work demonstrates the potential use of triamine-grafted pore-expanded mesoporous silica TRI-PE-MCM-41, for the removal of CO2 from nitrogen, oxygen and water vapor-containing mixtures. In addition to unprecedentedly high CO2 uptake at low pressure, high adsorption rate and stability, this material exhibited very high selectivity for CO2 over N2 and O2, regardless of the presence of moisture. It is thus highly suitable for use in CO2 removal from air, for example in air purification and in closed-circuit breathing systems.