Composite forward osmosis membrane and preparation method thereof
A forward osmosis membrane and liquid membrane technology, which is applied in the field of polymer membrane separation, can solve the problems of low doping amount, reduced recycled water quality, reduced water flux, etc. dirt effect
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Embodiment 1
[0041] (1) To 60g of N,N-dimethylacetamide, add 40g of a mixture of polysulfone and polysulfoneamide in a mass ratio of 1:3, stir until the polymer dissolves, and add 0.1g to the polymer solution with a particle size of about 40μm The nano-particles of macroporous chelating resin were ultrasonically dispersed and sealed and stirred for 30 minutes to obtain a casting liquid.
[0042] (2) Coating the casting liquid on a flat, dry and clean glass plate, the thickness of the casting liquid is 200 μm, the ambient temperature during coating is 5°C, and the humidity is 60%. Immediately after the coating was completed, the casting liquid and the glass plate were immersed in deionized water, and a polymer support layer was obtained after 12.2 min. Wherein, the membrane surface in direct contact with deionized water is the upper surface of the polymer support layer, and the membrane surface in direct contact with the glass plate is the lower surface of the polymer support layer.
[004...
Embodiment 2
[0046] The invention discloses a preparation method of a forward osmosis membrane doped with ion exchange resin.
[0047] (1) Add 15.8g of polyacrylonitrile to the mixed solvent of 84.2g of dioxane and N,N-dimethylformamide in a mass ratio of 2:1, stir until the polymer is dissolved, and then add 1.3 g of polyacrylonitrile to the polymer solution g Nanoparticles of a mixture of gel-type cationic resin and macroporous chelating resin with a particle size of about 8 μm, wherein the mass ratio of gel-type cationic resin and macroporous chelating resin is 5:2, ultrasonically dispersed and sealed After stirring for 30 min, the casting liquid was obtained.
[0048] (2) Coating the casting liquid on a flat, dry and clean glass plate, the thickness of the casting liquid is 150 μm, the ambient temperature during coating is 11.4° C., and the humidity is 20%. Immediately after the coating was completed, the casting liquid and the glass plate were immersed in deionized water, and a polym...
Embodiment 3
[0052] The invention discloses a preparation method of a forward osmosis membrane doped with ion exchange resin.
[0053] (1) Add 30.2g polyethersulfone to 69.8g dioxane, stir until the polymer dissolves, add 6.5g macroporous anion resin and macroporous chelating resin with a particle size of about 12 μm to the polymer solution The nano-particles, wherein the mass ratio of the macroporous anion resin and the macroporous chelating resin is 1:2, and the casting liquid is obtained after ultrasonic dispersion and sealing and stirring for 30min.
[0054] (2) Coating the casting liquid on a flat, dry and clean glass plate, the thickness of the casting liquid is 100 μm, the ambient temperature during coating is 53° C. and the humidity is 72%. Immediately after the coating is completed, the casting solution and the glass plate are immersed in deionized water, and a polymer support layer is obtained after 13 minutes. Wherein, the membrane surface in direct contact with deionized water...
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