Method for preparing organic forward osmosis membrane
A forward osmosis membrane, organic technology, applied in the field of membrane separation, can solve the problems of low retention rate, low membrane strength, low permeation flux, etc., to reduce internal concentration polarization, improve permeation flux, and increase antibacterial properties. Effect
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[0016] Example 1:
[0017] Using cellulose triacetate as the polymer, 13.1% (V%) cellulose triacetate and 0.9% (V%) chitin nanocrystals were added to 57.8% (V%) 1,4-dioxane , 19.6% (V%) of acetone and 8.6% (V%) of methanol in a mixed solvent, stirring at 60°C for 9 hours to dissolve the chitin nanocrystals with a content of 0.9% (V%) Casting liquid; let stand for more than 24h to make it completely defoamed; stir the casting liquid evenly, and then coat it on the substrate after standing for defoaming, and use a scraper to scrape evenly on the substrate to form a bottom film layer, and the base The bottom mold layer on the material was left to stand in the air for 30 seconds, and then the bottom film layer was put into the gel bath (the composition of the gel bath was deionized water) to undergo phase inversion and gel into a film with a dense skin layer, and the The membranes were heat-treated in a 50° C. water bath for 5 minutes, and after washing, they were stored in a 1% ...
Example Embodiment
[0020] Example 2:
[0021] Using cellulose diacetate as the polymer, 12.2% (V%) cellulose diacetate and 0.8% (V%) 1-pyrenebutyric acid nanoparticles were added to 55.1% (V%) 1,4-diacetate In a mixed solvent of oxane, 20.6% (V%) acetone, 7.2% (V%) methanol and 4.2% (V%) lactic acid, the mixture was stirred at 70°C for 24 hours and dissolved to form 0.9 % (V%) of the casting solution of chitin nanocrystals; stand for more than 24h to make it completely degassed; ultrasonically disperse for 30min; stir the casting solution evenly, and then coat it on the substrate after standing for degassing, and use A doctor blade uniformly scrapes the base film to form the base film layer, the base film layer on the base material is allowed to stand in the air for 15 seconds, and then the base film layer is put into the gel bath to undergo phase inversion and gel into a dense skin layer. Membrane, the prepared membrane was washed with deionized water to remove the residual organic solvent to ...
Example Embodiment
[0024] Example 3:
[0025] Weigh 20g of polysulfone polymer and dissolve it in 80g of mixed solvent composed of N,N-dimethylacetamide and polyethylene glycol 400 (the ratio of the two is 72:8), and the polymer concentration is 20%. Add 1 g of organic carbon nanotubes to the prepared polysulfone solution, disperse it in ultrasound for 30 minutes to prepare a casting solution containing 1wt% of organic carbon nanotubes, stir the casting solution evenly, After defoaming, coat it on the substrate, and use a scraper to scrape the substrate evenly to form a bottom film layer, put the bottom mold layer in a gel bath to form a gel film, using m-phenylenediamine and trimes The acid chloride was subjected to interfacial polymerization reaction on the formed membrane, and the reaction was carried out at 110° C. for 3 minutes; after the interfacial polymerization reaction, the prepared membrane was washed with deionized water to remove the residual organic solvent, thereby obtaining an or...
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