A Highly Permeable Aligned Montmorillonite Mixed‐Matrix Membrane for CO2 Separation. Issue 32 (17th June 2016) - Qiao, Zhihua
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 CO2 separation. High‐speed gas‐transport channels are formed by the aligned interlayer gaps of the modified montmorillonite, through which CO2 transport primarily occurs. High CO2 permeance of about 800 GPU is achieved combined with a high mixed‐gas selectivity for CO2 that is stable over a period of 600 h and independent of the water content in the feed. Abstract : A mixed‐matrix membrane consisting of aligned montmorillonite (AMT) and polysulfone was prepared for CO2 separation. The MT interlayer gaps were aligned with polyvinylamineacid chains that had been grafted onto the surface of the hydroxylated polysulfone substrate. The high‐speed transport channels in AMT result in high CO2 permeance and mixed‐gas permselectivity.