Synthesis of graphene oxide/polyimide mixed matrix membranes for desalination

Abstract

Nanohybrid graphene oxide (GO)/polyimide (PI) mixed matrix membranes (MMMs) were prepared by dispersing GO into PI through wet phase inversion method. The structure of GO/PI MMMs was characterized by using XRD, FT-IR and XPS. FESEM was used to analyze the morphology of the GO/PI MMMs. The hydrophilicity of the GO/PI MMMs was determined by static water contact angles. The performances of the GO/PI MMMs were evaluated for desalination of seawater through pervaporation.The GO/PI MMMs display excellent water permeability and salt rejection for desalination of different concentrations of seawater. At 90 C, the GO/PI MMMs exhibit a high water flux (36.1 kg m À2 h À1) and a high salt rejection (99.9%). Further, the GO/PI MMM displays a high stability for seawater desalination.This high separation performance combined with high stability and facile fabrication route recommend the developed GO/PI MMMs as a promising candidate for desalination of seawater.

Separation and purification using GO and r-GO membranes

“…Moreover, they explained that GO membranes would absorb CO 2 because of the attraction force between CO 2 and carboxyl or hydroxyl on r-GO akes, which has also been reported by other research. 52,54,119,157 The results from Kim are demonstrated in Fig. 9(a).…”

“…They prepared GO/CA composite membranes in which the water ux of the material improved by 129%, which is higher than that of bare CA. Feng et al 119 prepared GO/ polyimide membrane via phase inversion process. These membranes displayed a high salt exclusion rate (99.9%) and water ux (36.1 kg m À2 h À1 ).…”

Formation of a defect‐free polyimide/zeolitic imidazolate framework‐8 composite membrane for gas separation: in‐depth analysis of organic–inorganic compatibility

“…Among the various fillers such as zeolite, silica, carbon nanotube, graphene oxide and metal organic framework (MOF), zeolitic imidazolate framework‐8 (ZIF‐8) has attracted considerable attention due to its inherently better compatibility with polymers and its aperture size of 3.4 Å, which is suitable for CO 2 separation. In general, the compatibility between ZIF‐8 and polymer is enhanced mainly by introducing a linker between them.…”

“…6 In fact, the ZIF-94/6FDA-DAM composite membrane attained 200% increment of CO 2 permeability without jeopardizing the CO 2 /N 2 selectivity. 6 Among the various fillers such as zeolite, 5,7,8 silica, [9][10][11] carbon nanotube, [12][13][14] graphene oxide [15][16][17][18] and metal organic framework (MOF), 6,[19][20][21][22][23] zeolitic imidazolate framework-8 (ZIF-8) has attracted considerable attention due to its inherently better compatibility with polymers 2 and its aperture size of 3.4 Å, 24,25 which is suitable for CO 2 separation. In general, the compatibility between ZIF-8 and polymer is enhanced mainly by introducing a linker between them.…”

Enhanced CO2 separation performance by PVA/PEG/silica mixed matrix membrane

“…Also the homogeneous dispersion of the filler within the polymer matrix and good compatibility between the two phases is a major contributor to ensure good separation performance. Thus, the preparation of defect free homogeneously dispersed MMM remains a major challenge for researchers worldwide . The various approaches for MMM synthesis include physical blending, in situ polymerization, and in situ solution–gelation (sol–gel) process.…”