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We have reported, for the first time, a straightforward and eco-friendly approach to molecularly design graphene oxide (GO) nanosheets on robust hydrophobic polypropylene (PP) supports with excellent adhesion and superior separation performance for organic solvent nanofiltration (OSN) of dye/ethanol mixtures. The approach consists of (1) grafting the PP surface with polyethylene glycol (PEG) with...
For the first time, ultrathin boron bridged graphene oxide (GO) membranes have been successfully constructed on the modified microporous hollow fiber substrates using borates as the cross-linker. Nanochannels within GO layers can be molecularly engineered by manipulating the annealing process and the chemistry of boron bridges. GO framework composite membranes with proper charge properties and size...
A series of hyperbranched polyimides (HBPI) were selected as precursors for the production of carbon molecular sieve membranes (CMSMs) and the gas separation performance of the resultant CMSMs was explored. By varying the monomer compositions of HBPI precursor polymers, the influences of degree of branching on pore size and distribution of the CMSMs are investigated and examined. A CO 2 permeability...
The design of polyimide-based pseudo-interpenetrating polymer networks (IPNs) is proposed to tailor the molecular structure of polymeric precursors for fabricating carbon molecular sieve membranes (CMSMs). To demonstrate the feasibility of this concept, pseudo-IPNs comprising of poly(2,3,5,6-phenylene-2,2′-bis(3,4-carboxylphenyl)hexafluoropropane) diimide (6FDA–TMPDA) and 2,6-bis(4-azidobenzylidene)-4-methylcyclohexanone...
A feasibility study was conducted to explore the potential application of carbon molecular sieve membranes (CMSMs) in biofuel separation through pervaporation. “Defect-free” carbon/ceramic composite membranes were prepared as the separation barrier for the dehydration of ethanol. The supported CMSM carbonized at 650°C showed a great total flux of 4kg/m 2 h with a reasonably high separation...
Ion-exchanged sulfonated poly(aryl ether ketone), SPAEK with different counter-ions (H + , Na + and Ag + ) have been utilized as polymeric precursors to fabricate carbon membranes. The effects of the substituted metal ions in polymeric precursors on the separation properties of resultant carbon membranes were investigated. X-ray diffraction analysis reveals that the polymer...
An innovative combination of a photosensitive crosslinker, 2,6-bis(4-azidobenzylidene)-4-methyl-cyclohexanone (Azide) with poly (aryl ether ketone) (PAEK) is utilized to form a semi-interpenetrating network (IPN) as the precursor for carbon membranes. Low temperature pyrolysis (450–650°C) of this precursor produces carbon membranes with excellent olefin/paraffin separation performance that surpasses...
The separation of CO 2 /CH 4 separation is industrially important especially for natural gas processing. In the past decades, polymeric membranes separation technology has been widely adopted for CO 2 /CH 4 separation. However, polymeric membranes are suffering from plasticization by condensable CO 2 molecules. Thus, carbon molecular sieve membranes (CMSMs)...
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