Ultrathin Reduced Graphene Oxide/Organosilica Hybrid Membrane for Gas Separation

Here, reduced graphene oxide (r-GO) nanosheets were embedded in an organosilica network to assemble an ultrathin hybrid membrane on the tubular ceramic substrate. With the organosilica nanocompartments inside the r-GO stacks and the intensified polymerization, r-GO sheets endow the as-prepared hybrid membranes with high H-2 and CO2 separation performance. The resulting selectivities of H-2/CH4 and CO2/CH4 are found to be 223 and 55, respectively, together with gas permeance of approximately 2.5 x 10(-7) mol.m(-2).s(-1).Pa-1 for H-2 and 6.1 x 10(-8) mol.m(-2).s(-1).Pa-1 for CO2 at room temperature and 0.2 MPa. To separate larger molecules from H-2, the H-2/C3H8 and H-2/i-C4H10 selectivities are as high as 1775 and 2548, respectively. Moreover, at 150 degrees C and 0.2 MPa, the hybrid membrane retains high separation performances with ideal selectivities higher than 200 and 30 for H-2/CH4 and CO2/CH4, respectively, which are attractive for gas separation and purification of practical applications.