Effective gas separation through graphene oxide containing mixed matrix membranes

Abstract

In the present study, graphene oxide (GO) was incorporated into poly(vinylidene fluoride) (PVDF) and chemically modified PVDF (M-PVDF) to prepare mixed matrix membranes (MMMs) for gas separation application. Performed analyses proved appropriate dispersion of exfoliated GO sheets in polymer matrices and sufficient compatibility at the interfacial phases. M-PVDF based MMMs were thermally and mechanically more stable relative to the PVDF-based MMMs. The oxygen containing functional groups in M-PVDF was probably the main reason for this more stability. PVDF/GO MMMs rendered low gas permeability and high selectivity. Both impermeable GO sheets and crystalline phases of PVDF were responsible for such behavior. On the other hand, interestingly gas permeability of M-PVDF/GO MMMs was enhanced while no substantial decline was recorded in gas selectivity. For instance, He and CO 2 permeability was increased 12.46% and 25.89%, respectively, compared to the pure PVDF membrane. This behavior originated from functional groups of M-PVDF and the interaction of these groups with GO sheets. Since GO often amplified gas barrier properties of polymers, such increscent would be appreciable.

Removal of 1,2,4‐Trimethylbenzene from Water by Pervaporation Using Styrene–Butadiene–Styrene (SBS) Membrane Incorporated with Carbon Black Nanoparticles

“…According to Fig. , the peaks associated with the presence of CB are not obvious in the XRD spectra of the SBS/CB nanocomposite membranes which confirms the homogenous dispersion of CB nanoparticles in the polymer matrix, similar to the observed results for the polyetherimide/graphene oxide (GO) and PVDF/GO nanocomposites. Moreover, the addition of CB to the SBS copolymer was accompanied by a steady reduction in the intensity of the SBS peak which can be interpreted by the disturbed packing of the polymer chains due to the SBS–CB interaction.…”

Combining Silk Sericin and Surface Micropatterns in Bacterial Cellulose Dressings to Control Fibrosis and Enhance Wound Healing

“…In case of GO, it is known that the electrostatic repulsion arising from the carboxyl groups in interlayers causes undesirable cracks that led to mechanical instability of the membranes. To reduce such unwanted interlamellar interactions, a variety of natural and synthetic polymers [82][83][84] are often employed between the GO layers. Shen et al 85 utilized polyether block amide (PEBA) to create stable GO laminates (Figs.…”

PrestructuredMXenefillers with uniform channels to enhanceCO2selective permeation in mixed matrix membranes

“…For now, sheet‐like fillers, such as graphene oxide (GO) 13,14 and MoS 2, 15 attract plenty of interests in membrane community 16 . The selective channels of sheet‐like filler, randomly distributing after incorporating into the polymer matrix, can obviously enhance the selectivity by the “labyrinth effect” 17,18 as illustrated in Figure 1.…”