화학공학소재연구정보센터
Industrial & Engineering Chemistry Research, Vol.58, No.10, 4257-4266, 2019
Polyethylenimine-Grafted HKUST-Type MOF/PoIyHIPE Porous Composites (PEI@PGD-H) as Highly Efficient CO(2 )Adsorbents
Searching for highly efficient and robust CO2 adsorbents is very important for CO2 capture, utilization, and storage. In this study, new polyethylenimine-grafted metal-organic framework (MOF)-polymer composites, abbreviated as PEI@PGD-H, were synthesized via high internal phase emulsion (HIPE) template polymerization of divinylbenzene and glycidyl methacrylate, followed by in situ generation of HKUST-type MOF in the presence of hydrophobic-modified CuO nanoparticles via the reaction of CuO with 1,3,5-benzenetricarboxylic acid and then polyethylenimine (PEI) functionalization via epoxy-amine reaction and amine-metal sites interaction. The coexistence of the hierarchical interconnected porous skeleton of poly(glycidyl methacrylate-divinylbenzene) (PGD), high specific surface area of MOF, and chemical CO2 adsorption of PEI endows PEI@PGD-H with high CO2 adsorption capacity, rate, and selectivity. PEI7O@PGD-H shows a CO2/N-2 separation factor as high as 76 and CO2 adsorption capacities of 4.3, 3.0, and 1.8 mmol of CO2/g from pure CO2, simulated flue gas, and air, respectively. After 20 CO2 adsorption-desorption cycles, the adsorbent still retained a high and stable CO2 capture capacity over 2.8 mmol of CO2/g for simulated flue gas. The adsorbent also displays reasonably good thermal stability, excellent water endurance, low desorption energy, and easy shaping. The desorption heat is as low as 48 kJ/mol of CO2. These features make PEI@PGD-H highly efficient, robust, and low-energy CO2 adsorbents for practical application in CO2 capture.