Effect of graphene oxide on the behavior of poly(amide‐6‐b‐ethylene oxide)/graphene oxide mixed‐matrix membranes in the permeation process

Abstract

Polyether-block-amide (Pebax)/graphene oxide (GO) mixed-matrix membranes (MMMs) were prepared with a solution casting method, and their gas-separation performance and mechanical properties were investigated. Compared with the pristine Pebax membrane, the crystallinity of the Pebax/GO MMMs showed a little increase. The incorporation of GO induced an increase in the elastic modulus, whereas the strain at break and tensile strength decreased. The apparent activation energies (E p ) of CO 2 , N 2 , H 2 , and CH 4 permeation through the Pebax/GO MMMs increased because of the greater difficulty of polymer chain rotation. The E p value of CO 2 changed from 16.5 kJ/mol of the pristine Pebax to 23.7 kJ/mol of the Pebax/GO MMMs with 3.85 vol % GO. Because of the impermeable nature of GO, the gas permeabilities of the Pebax/GO MMMs decreased remarkably with increasing GO content, in particular for the larger gases. The CO 2 permeability of the Pebax/GO MMMs with 3.85 vol % GO decreased by about 70% of that of the pristine Pebax membrane. Rather than the Maxwell model, the permeation properties of the Pebax/GO MMMs could be described successfully with the Lape model, which considered the influence of the geometrical shape and arrangement pattern of GO on the gas transport.

Suppressing Salt Transport through Composite Pervaporation Membranes for Brine Desalination

“…Similar surface morphology was observed after incorporating GO into polyether block amide (Pebax) matrix using cast coating method [43]. In terms of the cross-sectional images ( Figure S4), they showed good agreement with the surface SEM images.…”

Mixed Matrix Membranes with Excellent CO2 Capture Induced by Nano‐Carbon Hybrids

“…For comparison purposes, the gas separation performance of the Pebax‐1657 based membranes reported by other researchers is listed in Table S1 . It was observed that the CO 2 /gas selectivity and CO 2 permeability of Pebax‐MWCNT@GONRs‐1 in this work were higher than those of most Pebax‐1657 based membranes reported.…”

Mixed Matrix Membranes for Gas Separation Applications

“…Other fillers that were used in the MMMs as fillers are silica, activated carbon, metal nanoparticles, graphene, carbon nanotubes, porous polymers, covalent organic frameworks, etc. [19][20][21][31][32][33][34][35][36][37][38][39] The microporous materials show very high selectivity owing to their molecular sieving capability. Another factor that affects the properties are their surface functionality which improves adsorption of the gases on their surfaces which in turn results in improved molecular diffusion through its pores.…”