Highly oriented metal-organic framework molecular sieve membrane and its preparation method and application
A metal-organic framework, molecular sieve technology, applied in separation methods, chemical instruments and methods, membranes, etc., to achieve the effects of improving nucleation strength, reducing grain boundary defects, and improving flexibility
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Embodiment 1
[0050] The concentration of the casting solution used in the present embodiment is as follows:
[0051] PVA (polyvinyl alcohol) aqueous solution concentration is 0.2wt%;
[0052] The concentration of the halloysite nanotube aqueous solution is 5mg / mL;
[0053] Zn-MOF synthesis precursor solution: zinc nitrate hexahydrate aqueous solution and dimethylimidazole aqueous solution are mixed at a volume ratio of 1:2, wherein the concentration of zinc nitrate hexahydrate aqueous solution is 0.1mol / L, and the concentration of dimethylimidazole aqueous solution is 0.4mol / L, when mixing, add the dimethylimidazole solution into the zinc nitrate hexahydrate solution.
[0054] (1) Preparation of membrane
[0055] Polyacrylonitrile (PAN) ultrafiltration membrane was treated in 50°C sodium hydroxide aqueous solution (1mol / L, the same below) for 1 hour; then soaked in water until the aqueous solution was neutral; then PAN was fixed into the cast membrane module;
[0056] Take 2mL of halloy...
Embodiment 2
[0062] The concentration of the casting solution used in the present embodiment is as follows:
[0063] PVA (polyvinyl alcohol) aqueous solution concentration is 0.2wt%;
[0064] The halloysite nanotube solution concentration is 5mg / mL;
[0065] Zn-MOF synthesis precursor solution: zinc nitrate hexahydrate aqueous solution and dimethylimidazole solution are mixed at a volume ratio of 1:2, wherein the concentration of zinc nitrate hexahydrate aqueous solution is 0.1mol / L, and the concentration of dimethylimidazole solution is 0.4mol / L, when mixing, add the dimethylimidazole solution into the zinc nitrate hexahydrate solution;
[0066] Co-MOF synthesis precursor solution: cobalt nitrate hexahydrate aqueous solution and dimethylimidazole solution are mixed at a volume ratio of 1:2, wherein the concentration of cobalt nitrate hexahydrate aqueous solution is 0.1mol / L, and the concentration of dimethylimidazole solution is 0.4mol / L, when mixing, add the dimethylimidazole solution ...
Embodiment 3
[0075] The concentration of the casting solution used in the present embodiment is as follows:
[0076] PVA (polyvinyl alcohol) aqueous solution concentration is 0.2wt%;
[0077] The halloysite nanotube solution concentration is 5mg / mL;
[0078] Co-MOF synthesis precursor solution: cobalt nitrate hexahydrate aqueous solution and dimethylimidazole solution are mixed at a volume ratio of 1:2, wherein the concentration of cobalt nitrate hexahydrate aqueous solution is 0.1mol / L, and the concentration of dimethylimidazole solution is 0.4mol / L, when mixing, add the dimethylimidazole solution into the zinc nitrate hexahydrate solution.
[0079] (1) Preparation of membrane
[0080] The polyacrylonitrile (PAN) ultrafiltration membrane was treated in a sodium hydroxide solution at 50°C for 1 hour; then, soaked in water until the aqueous solution was neutral; then the PAN was fixed into the cast membrane assembly;
[0081] Take 2mL of halloysite nanotube solution and 1mL of polyvinyl ...
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