Ultrathin Reduced Graphene Oxide/Organosilica Hybrid Membrane for Gas Separation

High Resolution Image Download MS PowerPoint Slide 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 CO 2 separation performance. The resulting selectivities of H 2 /CH 4 and CO 2 /CH 4 are found to be 223 and 55, respectively, together with gas permeance of approximately 2.5 × 10 –7 mol·m –2 ·s –1 ·Pa –1 for H 2 and 6.1 × 10 –8 mol·m –2 ·s –1 ·Pa –1 for CO 2 at room temperature and 0.2 MPa. To separate larger molecules from H 2, the H 2 /C 3 H 8 and H 2 / i -C 4 H 10 selectivities are as high as 1775 and 2548, respectively. Moreover, at 150 °C and 0.2 MPa, the hybrid membrane retains high separation performances with ideal selectivities higher than 200 and 30 for H 2 /CH 4 and CO 2 /CH 4, respectively, which are attractive for gas separation and purification of practical applications.