Amine-Tethered Adsorbents Based on Three-Dimensional Macroporous Silica for CO2Capture from Simulated Flue Gas and Air

New covalently tethered CO2adsorbents are synthesized through the in situ polymerization of N-carboxyanhydride (NCA) of l-alanine from amine-functionalized three-dimensional (3D) interconnected macroporous silica (MPS). The interconnected macropores provide low-resistant pathways for the diffusion of CO2molecules, while the abundant mesopores ensure the high pore volume. The adsorbents exhibit high molecular weight (of up to 13058 Da), high amine loading (more than 10.98 mmol N g–1), fast CO2capture kinetics (t1/2< 1 min), high adsorption capacity (of up to 3.86 mmol CO2g–1in simulated flue gas and 2.65 mmol CO2g–1in simulated ambient air under 1 atm of dry CO2), as well as good stability over 120 adsorption–desorption cycles, which allows the overall CO2capture process to be promising and sustainable.