Preparation, Characterization and Gas Adsorption Properties of Metal-Organic Aerogels†

doi:10.7503/cjcu20190102

Abstract

Abstract:

A series of UiO-66 metal-organic frameworks(MOFs) with excellent stability was used to prepare metal-organic aerogels as a feasible way for the modeling of MOFs. The as-prepared UiO-66-based metal-organic aerogels(MOAs) possessed hierarchical pore structure and high surface area, which were very promising in gas adsorption and separation applications. In gas adsorption measurements, the amine modified UiO-66-NH₂ aerogel exhibited outstanding adsorption capacity towards CO₂ and high selectivity up to 18.3 towards CO₂/CH₄ mixture(molar ratio, 1∶1) calculated through ideal adsorbed solution theory.

Key words: Metal-organic frameworks, Aerogels, Metal-organic aerogels, Adsorption selectivity

CLC Number:

O614

TrendMD:

LI Zhan,SHAN Xiaowen,YANG Pingping,GAO Zhuangzhuang,FANG Qianrong,XUE Ming,QIU Shilun. Preparation, Characterization and Gas Adsorption Properties of Metal-Organic Aerogels^†[J]. Chem. J. Chinese Universities, 2019, 40(6): 1116.

Figures/Tables 6

Scheme 1 Preparation of MOAs

Fig.1 PXRD patterns of simulated UiO-66(a), as-prepared UiO-66 powder(b), UiO-66 MOA(c), UiO-66-NO2 MOA(d) and UiO-66-NH2 MOA(e)

Fig.2 SEM(A—C) and TEM(D—F) images of UiO-66 MOA(A, D), UiO-66-NH2 MOA(B, E) and UiO-66-NO2 MOA(C, F)

Fig.3 TGA curves of UiO-66 MOA(a), UiO-66-NH2 MOA(b) and UiO-66-NO2 MOA(c)

Fig.4 N2 adsorption-desorption isotherms(A) and pore size distributions(B) of UiO-66 MOA(a), UiO-66-NH2 MOA(b) and UiO-66-NO2 MOA(c)

Fig.5 CO2(A), CH4(B) adsorption isotherms at 298 K and calculated selectivity(C) for CO2/CH4 mixture(molar ratio, 1∶1 ) at 298 K through ideal adsorbed solution theory a. UiO-66 MOA; b. UiO-66-NH2 MOA; c. UiO-66-NO2 MOA.

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