Hybrid brominated sulfonated poly（2,6-diphenyl-1,4-phenylene oxide） and SiO2 nanocomposite membranes for CO2/N2 separation

<正>Brominated sulfonated poly（2,6-diphenyl-1,4-phenylene oxide）(BSPPOdp) was synthesized as a new membrane material for CO2/N2 separation.The 90%brominated-10%sulfonated PPOdp(BSPPOdp9010) was selected as representative material for membrane preparation.It formed flexible membranes with higher CO2 permeability(PCO2= 58 Barrer) and selectivity (αCO2/N2 =36) than poly（2,6-dimethyl-1,4-phenylene oxide）(PPOdm) membranes.BSPPOdp9010 membranes containing silica nanoparticles enhanced CO2 permeability while maintaining the CO2/ N2 selectivity as compared with the pure BSPPOdp9010 membranes.The CO2 permeability increased as a function of the silica content in the membrane.The separation mechanism for CO2/N2 in the membranes was attributed to the gas solubility effect rather than the gas diffusivity.