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Facile Synthesis of Amine‐functionalized MOFs Incorporated Polyimide MMMs with Enhanced CO 2 Permselectivity
Author(s) -
Li Xiangbo,
Gao Tianyuan,
Zhou Zhihui,
Jiang Jinhua,
Feng Jing,
Chen Liang
Publication year - 2019
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.201803944
Subject(s) - polyimide , membrane , amine gas treating , materials science , chemical engineering , scanning electron microscope , metal organic framework , adsorption , gas separation , polymer , polymer chemistry , nanotechnology , chemistry , organic chemistry , layer (electronics) , composite material , biochemistry , engineering
Abstract Here a series of amine‐functionalized MOFs incorporated polyimide (PI) mixed matrix membranes (MMMs) are fabricated via an efficient method. The X‐ray diffraction (XRD) and scanning electron microscope (SEM) images clearly indicate that the metal‐organic framework (MOF) crystals are well‐retained and dispersed into the PI matrix. In addition, the resulting MMM is continuous and compact, no defects of pinhole/cracks and agglutinated MOFs can be observed from the membrane surface. This is because the hydrogen bonding between amine‐functionalized MOFs and PI can be enhanced, improving the dispersion of MOF crystals in the PI solution. More importantly, the PI/MOFs solution is further optimized by the removal of agglutinated MOFs that occur inevitably with increasing MOF loadings. The gas separation results show that the performance of MOF‐incorporated MMM has been greatly improved. For instance, compared with the pure PI film, CO 2 permeability can be increased by 154.4%. Meanwhile, the selectivities of CO 2 /N 2 and CO 2 /CH 4 are increased by 30% and 43%, respectively. Pore structure and gas adsorption properties of MOFs clearly affect the performance of the resulting MMM.