1 research outputs found
Self-Supported Fibrous Porous Aromatic Membranes for Efficient CO<sub>2</sub>/N<sub>2</sub> Separations
In this paper, we describe a new
synthesis protocol for the preparation
of self-supported hollow fiber membranes composed of porous aromatic
framework PAF-56P and PSF. PAF-56P was facilely prepared by the cross-coupling
reaction of triangle-shaped cyanuric chloride and linear <i>p</i>-terophenyl monomers. The prepared PAF-56P material possesses an
extended conjugated network, the structure of which is confirmed by
nuclear magnetic resonance and infrared characterizations, as well
as a permanent porosity with a BET surface area of 553.4 m<sup>2</sup> g<sup>–1</sup> and a pore size of 1.2 nm. PAF-56P was subsequently
integrated with PSF matrix into PAF-56P/PSF asymmetric hollow fiber
membranes via the dry jet-wet quench method employing PAF-56P/PSF
suspensions. Scanning electron microscopy studies show that PAF-56P
particles are embedded in the PSF matrix to form continuous membranes.
Fabricated PAF-56P/PSF membranes were further exploited for CO<sub>2</sub> capture, which was exemplified by gas separations of CO<sub>2</sub>/N<sub>2</sub> mixtures. The PAF-56P/PSF membranes show a
high selectivity of CO<sub>2</sub> over N<sub>2</sub> with a separation
factor of 38.9 due to the abundant nitrogen groups in the PAF-56P
framework. A preferred permeance for CO<sub>2</sub> in the binary
CO<sub>2</sub>/N<sub>2</sub> gas mixture is obtained in the range
of 93–141 GPU due to the large CO<sub>2</sub> adsorption capacity
and a large pore size of PAF-56P. Additionally, PAF-56P/PSF membranes
exhibit excellent thermal and mechanical stabilities, which were examined
by thermal analysis and gas separation tests with the dependencies
of temperatures and pressures. The merits of high selectivity for
CO<sub>2</sub>, good stability, and easy scale up make PAF-56P/PSF
hollow fiber membranes of great interest for the industrial separations
of CO<sub>2</sub> from the gas exhausts