writer：Junjie Zhu, Linbo Wu*, Zhiyang Bu, Suyun Jie*, Bo-Geng Li.
keywords：CO2 adsorption and separation, CO2 adsorbent, metal-organic frameworks, polyethyleneimine
source：期刊
specific source：ACS Omega 2019, 4(2), 3188?3197. DOI: 10.1021/acsomega.8b02319 https://pubs.acs.org.ccindex.cn/doi/p
Issue time：2019年

UiO-66-NH2, a zirconium-based functional metal?organic framework (MOF), was postsynthetically modified via Schiff base reaction between aldehyde groups in glutaraldehyde and amino groups in UiO-66-NH2 and CO2-preabsorbed polyethyleneimine (PEI). The resulting PEImodified MOFs, abbreviated as PEIC@UiO, were characterized with 1H NMR, Fourier transform infrared, powder Xray diffraction, Brunauer?Emmett?Teller, scanning electron microscopy, and thermogravimetric analysis and evaluated as CO2 adsorbents. In comparison with pristine UiO-66-NH2, the PEIC@UiO adsorbents have reduced specific surface area (7?150 m2/g) but maintained the same crystal structure. Particularly, the PEIC96@UiO adsorbent exhibited significantly improved CO2/N2 adsorption selectivity (48 vs 25) and higher CO2 adsorption capacity (3.2 vs 2.7 mmol/g). The adsorbent also displayed moderate desorption energy (68 kJ/mol CO2), superior moisture endurance, and recyclability, which are very desirable for practical applications.