Fabrication and characterization of polysulfone-graphene oxide mixed matrix membranes for the effect of glass transition temperature of polymer on the selective layer for separation

The polysulfone mixed matrix membranes (MMM) with concentrations of graphene oxide (۰.۰, ۰.۲۵ and ۰.۵ wt.% of polymer) fabricated by a phase separation method. the obtained results show that the kinetic selectivity means the ratio of the penetration coefficients of two gases, which expresses the different sizes of the two gases CO۲/N۲ and CO۲/CH۴. first, by adding ۰.۲۵ percent by weight of graphene oxide to the composite matrix, the selectivity of CO۲/N۲ became ۱۲.۲۴ and ۵۰ percent by weight of graphene oxide was ۱۷.۷۹. while CO۲/CH۴ selectivity was ۱۰.۹۴ and ۱۴.۱۴ respectively. For this purpose, by addition of graphene oxide to the membrane structure, Tg increased considerably due to the strong bond between polysulfone and graphene oxide. These strong bonds are due to the active agent groups present in the surface of graphene oxide, which have established a good bond with the polymer.

Keywords:

Membrane gas separation , Mixed matrix membrane , Graphene oxide