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Tremendous efforts have been devoted to increasing the CO 2 capture performance of porous materials, especially for low CO 2 concentration environments. Here, we report that hydrazine can be used as a diamine short enough to functionalize the small-pore metal-organic framework [Mg 2 (dobdc)] (H 4 dobdc = 2,5-dihydroxyl-1,4-benzenedicarboxylic acid). By virtue of the ultrahigh concentration of free amine groups (6.01 mmol g -1 or 7.08 mmol cm -3 ) capable of reversible carbamic acid formation, the new material [Mg 2 (dobdc)(N 2 H 4 ) 1.8 ] achieves a series of new records for CO 2 capture, such as single-component isotherm uptakes of 3.89 mmol g -1 or 4.58 mmol cm -3 at the atmospheric CO 2 concentration of 0.4 mbar at 298 K and 1.04 mmol g -1 or 1.22 mmol cm -3 at 328 K, as well as more than a 4.2 mmol g -1 or 4.9 mmol cm -3 adsorption/desorption working capacity under dynamic mixed-gas conditions with CO 2 concentrations similar to those in flue gases and ambient air.

Putting an ultrahigh concentration of amine groups into a metal–organic framework for CO2capture at low pressures

Putting an ultrahigh concentration of amine groups into a metal–organic framework for CO₂capture at low pressures