Amine-functionalized mesoporous UiO-66 aerogel for CO2 adsorption

A mesoporous UiO-66-NH 2 aerogel is prepared via a straightforward sol–gel method without using any binders or mechanical pressures, in which the amine groups are directly introduced into the matrix by using 2-aminoterephthalic acid. The novel UiO-66-NH 2 aerogel also exhibits high specific surface area and mesopore-dominated structure, implying its highly potential use in CO 2 adsorption. For ulteriorly investigating the effect of amine loading on the CO 2 adsorption ability, a series of UiO-66-NH 2 aerogel with different amino content is fabricated by changing the ligand/metal molar ratio. When the molar ratio is 1.45, the CO 2 adsorption capacity reaches the optimum value of 2.13 mmol·g −1 at 25 °C and 0.1 MPa, which is 12.2% higher than that of pure UiO-66 aerogel. Additionally, UiO-66-NH 2 -1.45 aerogel also has noticeable CO 2 selectivity against N 2 and CH 4 as well as good regeneration stability. Such results imply that it has good application prospect in the field of CO 2 adsorption, and also contains the potential to be applied in catalysis, separation and other fields.