Comparison of different MOF fillers on CO₂ removal performance of supported PEBA mixed matrix membranes

Abstract

Poly(amide-6-b-ethylene oxide)(PEBA) mixed matrix membranes (MMMs) containing different metal-organic frameworks (MOFs) of CuBTC, ZIF-8, and ZIF-67 have been dip-coated on asymmetric PAN supports. To optimize the ideal skin-layer parameters, MOF loadings of 5, 15, 25, and 35 wt% were applied. The synthesized MOFs and MMMs were structurally characterized using X-ray diffraction (XRD), Fourier-transform infrared (FTIR), and field emission scanning electron microscopy (FESEM). The average sizes of the synthesized ZIF-8, ZIF-67, and CuBTC have been determined about 100, 400, and 60-500 nm, respectively. Permeability tests of the MMMs performed using 12-bar feed streams of pure CO 2 , CH 4 , and N 2 , showed 200-338% enhancements of CO 2 permeability and up to a 43% increase in CO 2 /CH 4 selectivity relative to the neat PEBA membrane. The membrane performances were also examined by the mixed gas feeds of CO 2 :CH 4 (10:90).

A Review of the Recent Progress in the Development of Nanocomposites Based on Poly(ether-block-amide) Copolymers as Membranes for CO2 Separation

“…MOF-801 nanocrystals were incorporated into Pebax on a porous substrate via spinning-coating [ 77 ]. ZIF-8, ZIF-67, and CuBTC were dispersed in Pebax at loadings of up to 35 wt% and dip-coated on PAN supports [ 78 ]. Other composite MMMs were prepared on polyethersulfone supports with ZIF-8 nano-fillers loaded into the Pebax polymer (up to 2 wt%), displaying interesting gain in the selectivity of CO 2 /N 2 when compared to silica nanofillers [ 17 ].…”