Flexible free-standing carbon molecular sieve@graphene composite membrane and preparation method thereof
A graphene composite and carbon molecular sieve technology, applied in separation methods, chemical instruments and methods, membrane technology, etc., can solve problems such as poor thermal and chemical stability, poor mechanical strength, and reduced interlayer spacing, and achieve soft texture.
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Embodiment 1
[0035] Graphite oxide was added into N,N-dimethylformamide, and ultrasonically dispersed to obtain a 3 mg / mL graphene oxide dispersion. The polyimide prepolymer polyamic acid was added into N,N-dimethylformamide to prepare a 1wt.% PAA solution.
[0036] Preparation of carbon molecular sieve precursor polymer@graphene oxide composite film by solvent evaporation method: mix the graphene oxide dispersion and PAA solution at a volume ratio of 3:1, add it to a polytetrafluoroethylene vessel, and place it horizontally on a constant temperature platform. Evaporated at 50°C for 24 hours to obtain a PAA@graphene oxide composite film. After the PAA@graphene oxide composite film was vacuum-dried at 70 °C for 12 h, it was peeled off from the polytetrafluoroethylene vessel.
[0037] The obtained self-supporting PAA@graphene oxide composite membrane was placed in a carbonization furnace under a nitrogen atmosphere from room temperature at a rate of 3°C / min to 600°C for 1 hour to obtain a f...
Embodiment 2
[0039] Graphite oxide was added into dimethyl sulfoxide and dispersed ultrasonically to obtain a 3 mg / mL graphene oxide dispersion. Add polyaryletherketone into dimethyl sulfoxide to prepare a 5wt.% PEK-C solution.
[0040] Preparation of carbon molecular sieve precursor polymer@graphene oxide composite film by solvent evaporation: mix the graphene oxide dispersion and PEK-C solution at a volume ratio of 15:1, add it to a glass watch glass, and place it horizontally on a constant temperature platform. Evaporate at 100°C for 48 hours to obtain PEK-C@graphene oxide composite film. After the PEK-C@graphene oxide composite film was vacuum-dried at 100 °C for 24 h, it was peeled off from the glass watch glass.
[0041] The obtained self-supporting PEK-C@graphene oxide composite membrane was placed in a carbonization furnace, under an argon atmosphere, from room temperature at a rate of 5°C / min to 700°C, and kept at a constant temperature for 1h to obtain a flexible self-supporting...
Embodiment 3
[0043] Graphite oxide was added into N-methylpyrrolidone and dispersed ultrasonically to obtain a 2 mg / mL graphene oxide dispersion. Add polyaryletherketone to N-methylpyrrolidone to prepare a 15wt.% polyaryletherketone solution.
[0044] Preparation of carbon molecular sieve precursor polymer@graphene oxide composite film by solvent evaporation: mix graphene oxide dispersion and polyaryletherketone solution at a volume ratio of 60:1, add it to a stainless steel vessel, and place it horizontally on a constant temperature platform. Evaporate at 150°C for 12 hours to obtain a polyaryletherketone@graphene oxide composite film. After vacuum-drying the polyaryletherketone@graphene oxide composite film at 150°C for 24 hours, it was peeled off from the stainless steel vessel.
[0045] The obtained self-supporting polyaryletherketone@graphene oxide composite film was raised from room temperature to 550°C at a rate of 3°C / min in a carbonization furnace in a helium atmosphere, and the ...
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