Synthesis， N2 Adsorption and Mixed-matrix Membrane Performance of Bimetal Isostructural CAU-21

doi:10.7503/cjcu20210578

Abstract

Abstract:

The preparation of bimetal isostructural metal-organic frameworks（MOFs）was achieved by doping metals， and the maximum metal doping amounts of CAU-21-Al/M that can maintain the original crystal configuration were obtained from powder X-ray diffraction（PXRD）patterns. Scanning electron microscopy（SEM）was used to observed the influence of doping metals on the morphology of materials， and thermogravimetric analysis（TGA）showed that CAU-21-Al/M（M=Fe， Ga， In， Gd） all had good thermal stability. The results of nitrogen gas adsorptions and the gas permeation experiments of mixed-matrix membranes with CAU-21-Al/M as fillers are inversely related to the size of doped metal ions， verifing that dopping metal can effectively control the pore structure of MOFs.

Key words: Isostructral metal-organic framework, Gas adsorption, Gas permeability of composite membrane

CLC Number:

O647

TrendMD:

ZHANG Chi, SUN Fuxing, ZHU Guangshan. Synthesis， N₂ Adsorption and Mixed-matrix Membrane Performance of Bimetal Isostructural CAU-21[J]. Chem. J. Chinese Universities, 2022, 43(1): 20210578.

Figures/Tables 7

Fig.1 Structure schematic of CAU?21(A) and the window of the pore in the CAU?21 structure composed of eight metal oxygen clusters(B)The blue part is shown as one?dimensional channel

Fig.2 XRD pattens of products obtained from experiments with different metals and different doping amounts

Table 1 Comparison of the metal contents in the materials measured by EDX and the feed ratio

MOF code	Molar ratio of Al/M
MOF code	EDX	Feed ratio
CAU?21?Al/Fe?5	72∶28	30∶70
CAU?21?Al/In?6	75∶25	10∶90
CAU?21?Al/Gd?4	94∶6	40∶60

Fig.3 SEM(A—D) and EDS element mapping(E—H) images of CAU?21?Al/M with the metal Fe, Ga, In, and Gd reaching the maximum doping amountsThe purple in the EDS mapping result shows the distribution of Al, blue shows the distribution of In, and yellow shows the distribution of Gd.

Fig.4 TGA results of materials with different dopingmetals reaching the maximum doping amounts

Fig.5 N2 adsorption test results of CAU?21 materials with different doping metals reaching the maximum doping amounts

Fig.6 Histograms of nitrogen permeability of mixed?matrix membranes using PIM?1 as the matrix with 15%(mass fraction) filler under different feed pressures

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Synthesis， N₂ Adsorption and Mixed-matrix Membrane Performance of Bimetal Isostructural CAU-21

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