A Novel Combining Strategy of Hierarchically Porous Metal Organic Framework (Hp-Mof) and Cellulose Aerogel to Improve the Co2 Absorption Performance

High CO2 concentration in atmosphere caused serious environmental issues, and carbon capture and storage (CCS) technology had attracted significant attention. To date, MOF became the preferred material for CO2 adsorption, unfortunately, the microporous property and weak stability of MOF powder prevented its CO2 adsorption performance. To break this bottleneck, herein, a new strategy was proposed for the first time by combining cellulose aerogel and hierarchically porous MOF (HP-MOF) with lager aperture size. According to this novel strategy, a series of microcrystalline cellulose/HP-UIO-66-NH2 hybrid aerogels (MC-HUN-X) were constructed via adding the modulator (monocarboxylic acid, MA) and in-situ growth of HP-UIO-66-NH2 on cellulose aerogel. By adjusting the chain length of MA, the hybrid materials of HP-MOF with different pore sizes and aerogel were obtained, an interesting phenomenon was found: 1) increasing appropriately the pore size of HP-MOF could improve the CO2 adsorption capacity, 2) while the adsorption capacity would decrease after the aperture up to a certain size, 3) but, the adsorption selectivity of CO2 increased all the time with the increase of pore size. Through the comparison of all samples, MC-HUN-4 with modest aperture size had highest CO2 adsorption capacity (1.90 mmol/g at 298 K and 1 bar) and high adsorption selectivity (13.02 and 2.40 for CO2/N2 and CO2/CH4 ). In addition, the combining with cellulose aerogel endowed the excellent mechanical stability and reusability for MC-HUN-X. Importantly, this novel strategy was valuable to develop various HP-MOF hybrid aerogels with outstanding adsorption performance.