466429 Nanocellulose Based Facilitated Transport Membranes for CO2 Separation
The permeability of CO2, CH4 and N2 was measured at 35 °C as a function of relative humidity. Water sorption experiments were also performed, allowing a better understanding of the permeability results with respect to the actual water content within the membrane. As a reference, pure MFC films have been also prepared and their gas permeability tested in the same conditions.
The overall results suggest that both MFC and MFC/PVAm films have really interesting performances for both the CO2/CH4 and CO2/N2 separations, showing very high selectivity values (higher than 400) and placing most materials well above the trade-off curve of 2008 Robeson’s plot.
MFC films showed higher selectivity but lower CO2 permeability with respect to the MFC-Lupamin blends, likely because of the different level of water absorbed by the two polymeric matrixes. Indeed, pure MFC never exceeded 10 %wt water uptake, while the Polyvinylamine blends showed a clear upturn in the water sorption curve for RH larger than 60%, reaching a mass uptake higher than 50%wt at the maximum water activity inspected.