A Highly Permeable Aligned Montmorillonite Mixed‐Matrix Membrane for CO2 Separation

Abstract Highly permeable montmorillonite layers bonded and aligned with the chain stretching orientation of polyvinylamineacid are immobilized onto a porous polysulfone substrate to fabricate aligned montmorillonite/polysulfone mixed‐matrix membranes for CO 2 separation. High‐speed gas‐transport channels are formed by the aligned interlayer gaps of the modified montmorillonite, through which CO 2 transport primarily occurs. High CO 2 permeance of about 800 GPU is achieved combined with a high mixed‐gas selectivity for CO 2 that is stable over a period of 600 h and independent of the water content in the feed.