A kind of naa molecular sieve membrane, preparation method and application thereof
A molecular sieve and separation membrane technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problems of few crystal nuclei sites in the membrane-making solution, unstable batch membrane performance, and high separation accuracy requirements. To achieve the effect of excellent separation performance, high yield and easy operation
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Embodiment 1
[0060] The preparation of the graphene of embodiment 1 small size
[0061] Graphene oxide was prepared by the Hummers method: 1 g of natural graphite, concentrated H 2 SO 4 、H 3 PO 4 The three are placed in a three-necked flask, and concentrated H 2 SO 4 with H 3 PO 4 The volume ratio of the solution was 9:1, and 6 g of potassium permanganate was added in portions, and stirred in an ice-water bath for 1 h. The temperature was raised to 50°C, and the reaction was kept for 12 hours. The obtained product was poured into ice water, and an appropriate amount of hydrogen peroxide was added while stirring until the color of the solution turned golden yellow, then filtered, and the product was washed with HCl (5% by volume) and distilled water until the pH value was close to 7. Finally, the obtained graphite oxide was dispersed in water, ultrasonicated for 8 hours, and dried in a vacuum oven for later use.
[0062] Graphene was prepared by thermal expansion method: 0.1 g of g...
Embodiment 2
[0064] The preparation of embodiment 2 NaA molecular sieve membrane
[0065] Preparation of graphene-containing seed crystal suspension: Weigh 1 g of NaA molecular sieve seed crystals and disperse them in 100 g of deionized water, and use ultrasonic treatment to disperse them evenly to obtain NaA molecular sieve seed crystal suspensions. Weigh 1 g of graphene with a sheet diameter of 5 μm and add it to the uniformly dispersed NaA molecular sieve seed crystal suspension. After vigorous stirring, ultrasonic treatment is used to obtain a uniformly dispersed graphene-containing seed crystal suspension.
[0066] Pre-coated seed crystals: place the porous support in the graphene-containing seed crystal suspension of S2 for 5 seconds, take it out, put it in an oven at 50° C., and dry it to obtain a seeded support.
[0067] Synthesis of NaA molecular sieve membrane: Dissolve sodium metaaluminate and sodium silicate in deionized water respectively. After the two solutions are clarified...
Embodiment 3
[0070] Preparation of graphene-containing seed crystal suspension: Weigh 0.5 g of NaA molecular sieve seed crystals and disperse them in 100 g of deionized water, and use ultrasonic treatment to make them uniformly dispersed to obtain NaA molecular sieve seed crystal suspensions. Weigh 0.5g of graphene with a sheet diameter of 3 μm and add it to the uniformly dispersed NaA molecular sieve seed crystal suspension, and after vigorous stirring, use ultrasonic treatment to obtain a uniformly dispersed graphene-containing seed crystal suspension.
[0071] Pre-coated seed crystals: place the porous support in the graphene-containing seed crystal suspension of S2 for 5 seconds, take it out, put it in an oven at 50° C., and dry it to obtain a seeded support.
[0072] Synthesis of NaA molecular sieve membrane: Dissolve sodium metaaluminate and sodium silicate in deionized water respectively. After the two solutions are clarified, slowly add the silicon source solution to the aluminum so...
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