Polysulfone/zinc oxide nanoparticle mixed matrix membranes for CO₂/CH₄ separation

Abstract

Preparation and characterization of novel polysulfone/zinc oxide (PSf/ZnO) mixed matrix membranes (MMMs) with different ZnO loadings for high selective CO 2 /CH 4 separation were aimed in this study. Scanning electron microscopy photographs demonstrated that spongy and small tear like pores in plain PSf membrane (0 wt % of ZnO) replaced with large tear like pores close to surface layer by increasing ZnO content up to 0.1 and 1 wt %. In contrast, a dense and less free volume structure was obtained in membranes having 3 and 5 wt % of ZnO. Membrane porosity increased from 28.68 to 50.51% with increasing ZnO content from 0 to 1 wt %. Then, a reduction in porosity was observed for membranes containing 3 and 5 wt % of ZnO. Atomic force microscopy images presented variation in membrane surface roughness. Surface roughness decreased from 67.64 nm for plain PSf to 47.86 nm for membrane containing 1 wt % of ZnO. While, surface roughness increased and reached to 115.5 and 122.4 nm for MMMs having 3 and 5 wt % of ZnO. Gas separation properties of PSf/ZnO MMMs were examined and CO 2 /CH 4 selectivity of MMMs containing 3 and 5 wt % of ZnO were 22.29 and 54.29, respectively, in 1 bar feed pressure.

Porous Perovskite Fibers – Preparation by Wet Phase Inversion Spinning and Catalytic Activity

“…All fibers show the typical structure with finger‐like pores but spinning of the fibers into a coagulation bath of IPA results in less macrovoids and more uniformly sized pores. This is in agreement with literature 44. Because H 2 O has a stronger affinity to the solvent NMP, faster demixing occurs leading to larger pore formation.…”

High efficient removal of lead(II) and nickel(II) from aqueous solution by novel polysulfone/Fe3O4–talc nanocomposite mixed matrix membrane

“…6 shows the spectra of PSf and PSf/Fe 3 O 4 -talc mixed matrix membranes in the range of 280-1880 cm −1 . A sharp peak at 1,240 cm −1 and two peaks at the range 1,300-1,350 cm −1 were assigned to C-O-C group and the symmetric O=S=O stretching vibration in PSf [20,21]. High intensity peaks at 1,490 and 1,590 cm −1 were assigned to vibration of OH and C=C conjugation system of the benzene ring in PSf [22,23].…”

Highly permselective MIL‐68(Al)/matrimid mixed matrix membranes for CO2/CH4 separation

“…However, most raw natural gases contain undesirable impurity CO 2 with concentration as high as 70% . The presence of CO 2 will reduce the energy efficiency of natural gases, and corrode pipelines in the presence of water . Consequently, effective separation techniques are highly desired to separate CO 2 from natural gases.…”

“…Generally, MMMs with both high permeability and high separation selectivity are desirable in practical applications. To achieve these aims, a rational choice of matrix/filler pair plays an important role in successful preparation of MMMs . Moreover, in practical usage, the operation conditions, especially operation pressure and temperature, are of great importance .…”