Ultrapermeable composite membranes based on carbon nanotubes and graphene oxide:
The effect of metal ion content on H2/CO2 separation performance

Karel Friess
Faculty of Chemical Engineering, University of Chemistry and Technology Prague

The outstanding H2/CO2 separation performance of novel composite membranes based on oxidized single-wall carbon nanotubes (SWCNT) and graphene oxide is presented. The SWCNT-GO membranes were prepared by the pressure-driven gravitation assembling method. The ultrapermeable character of SWCNT-GO membrane is given by its mesoporous SWCNT supporting layer and the selectivity of SWCNT-GO membrane increased after mild oxidation. The remarkable separation efficiency of oxidized SWCNT-GO membranes was found after decoration with different amounts of metal ions. The tremendous separation performance was manifested by exceeding the corresponding Robeson 2008 upper bound for H2/CO2. Our results demonstrate the potential of composite SWCNT-GO materials and open a new promising route towards the fabrication of highly permeable, durable and efficient H2-selective separation membranes for industrial application.