A kind of organic-inorganic hybrid polyamide nanofiltration membrane and preparation method thereof
A polyamide, nanofiltration membrane technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problems of reducing the mechanical strength of the membrane, unsuitable for use, etc., and achieves a simple and easy process and high cross-linking degree. , the effect of broad application prospects
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Embodiment 1
[0035] The porous support layer used is a polysulfone ultrafiltration membrane with a molecular weight cut-off of 20,000; the ammonium octachloride propyl cage silsesquioxane is dissolved in water to form an aqueous solution with a mass fraction of 0.5 wt%, and the solute 1.5 twice the molar equivalent of triethylamine; the organic phase is a n-hexane solution with a mass fraction of 0.1wt% trimesoyl chloride; immerse the polysulfone support membrane in the water phase for 15 minutes, take it out and immerse it in the organic phase for 5 minutes after the surface is dry , take it out and dry it in the air for 1 minute, put it in an oven at 80°C for 10 minutes, and test its performance after immersing in cold water overnight; the pure water flux is 0.34L / m2hatm, and the rejection rate of 1000ppm NaCl at 0.8MPa is 69%.
Embodiment 2
[0037] The porous support layer used is a polysulfone ultrafiltration membrane with a molecular weight cut-off of 10,000; the ammonium octachloride propyl cage silsesquioxane is dissolved in water to form an aqueous solution with a mass fraction of 2 wt%, and the solute is added dropwise 1.5 times molar equivalent of triethylamine; the organic phase is a n-hexane solution of trimesoyl chloride with a mass fraction of 0.3wt%; the wetted polysulfone support membrane is immersed in the water phase for 20 minutes, taken out and immersed in the organic phase after the surface is dry 10 minutes, take it out and dry it in the air for 1 minute, put it in a 90°C oven for 5 minutes, and test its performance after immersing in cold water overnight; the pure water flux is 0.21L / m 2 hatm, the rejection rate of 1000ppmNaCl is 70% at 0.8MPa.
Embodiment 3
[0039] The porous support layer used is a polysulfone ultrafiltration membrane with a molecular weight cut-off of 30,000; the ammonium octachloride propyl cage silsesquioxane and m-phenylenediamine are dissolved in water to form an aqueous solution with a mass fraction of 1 wt%. The mass ratio of octaammonium propyl cage silsesquioxane to m-phenylenediamine is 7:3, and triethylamine with 1.5 times the molar equivalent of octaammonium propyl cage silsesquioxane of solute is added dropwise; The organic phase is a n-hexane solution with a mass fraction of 0.15wt% trimesoyl chloride; immerse the wet polysulfone support membrane in the water phase for 5 minutes, take it out and wait for its surface to dry, then immerse it in the organic phase for 2 minutes, take it out in the air Dry in the shade for 1 minute, put in a 70°C oven for 10 minutes, and test performance after immersing in cold water overnight; the pure water flux is 2.03L / m 2 hatm, the rejection rate of 1000ppmNaCl at 0...
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