The effects of F-CNF loading on the gas separation (O2, N2, CO2
and CH4) performance of the MMMs were evaluated using laboratory-scale gas separation apparatus. The
MMMs exhibited higher CO2 permeability and perm-selectivity of CO2/CH4 due to higher interaction of
amine groups on F-CNFs with CO2 as compared with the neat PSf membrane. The permeation
measurement showed the CO2 and O2 permeability of about 3.57 and 1.58 (GPU), and CO2/CH4 and O2/N2
selectivity of about 7.7, 3.5, respectively, were obtained for MMM with 0.5 wt.% F-CNFs loading. As a
result, the developed membranes can be efficient for separating CO2 from CH4. The N2 selectivity was
increased with addition of 0.5 wt.% F-CNFs in the PSf casting solution, and then decreased with higher
loading.