Investigation of СО2 Adsorption on Amine-Functionalized Silicas and Metal-Organic Polymers

Adsorption properties of amine-functionalized mesoporous silica NH 2 -SBA-15, zeolite-like imidazole framework ZIF-8, and amine-functionalized metal-organic polymer NH 2 -MIL-53 have been investigated. Non-modified mesoporous adsorbent SBA-15 has a higher sorption capacity for CO 2 than microporous ZIF-8, although microporous sample is characterized by a larger surface area and the values of total pore volume are close. When amine groups are present on the surface of the adsorbents, the chemical adsorption contributes more then the physical one. The adsorption capacity increases with increasing concentration of the functional groups which, in its turn, correlates with adsorbent surface area. Among the studied samples, the best adsorption properties demonstrate amine-functionalized adsorbents, aminefunctionalized mesoporous silica NH 2 -SBA-15, and amine-functionalized metal-organic polymer NH 2 -MIL-53.