Thin-film composite nanofiltration membrane as well as preparation method and application thereof
A composite nanofiltration membrane and thin film technology, applied in the field of materials, can solve the problems of increased post-processing difficulty and cost, decreased salt retention performance, and widened pore size distribution, achieving high ion selectivity and salt rejection, efficient removal and The effect of selective screening and simple preparation method
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[0035] As another aspect of the technical solution of the present invention, it also relates to a preparation method of a thin-film composite nanofiltration membrane, comprising:
[0036] Provide amine monomer solution;
[0037] Fully infiltrating the surface of the porous support substrate with the amine monomer solution, drying and placing it in an organic phase solvent to pre-diffuse the amine monomer; and,
[0038] Adding a polybasic acid chloride monomer solution to the organic phase solvent, and making the amine monomer and polybasic acid chloride monomer carry out a pre-diffusion interfacial polymerization reaction on the surface of the porous support substrate to generate a polyamide active separation layer, thereby obtaining a thin film Composite nanofiltration membrane.
[0039] The preparation principle of the thin film composite nanofiltration membrane of the present invention is as follows: the method of pre-diffusion interfacial polymerization is adopted, and a ...
Embodiment 1
[0072] Under the condition of 25℃, soak the surface of commercial polyethersulfone ultrafiltration membrane with 7.5g / L piperazine (PIP) solution for 30s, then blot the excess solution on the membrane surface, then apply 2mL n-hexane to soak the membrane surface 2min, then immediately add 2mL of prepared 2g / L trimesoyl chloride (TMC) n-hexane solution dropwise to carry out interfacial polymerization reaction for 1min, after the reaction is completed, soak the membrane in n-hexane to wash off excess trimesoyl chloride. Finally, the membrane was heated at 60 °C for 30 min, rinsed with pure water, soaked, and stored in deionized water.
[0073] After testing, the thin-film composite nanofiltration membrane prepared in this example was tested at a temperature of 25 °C and an operating pressure of 4 bar. 2 SO 4 The flux of the aqueous solution is 24Lm -2 h -1 , the rejection rate is 99.5%; for 1000ppm MgSO 4 The flux of the aqueous solution is 25.6Lm -2 h -1 , the rejection r...
Embodiment 2
[0076] At 25 °C, the surface of a commercial polyethersulfone ultrafiltration membrane was soaked with 10 g / L piperazine (PIP) solution for 30 s, the excess solution on the membrane surface was blotted dry, and then 2 mL of carbon tetrachloride was applied on the membrane surface. Soak for 30s, then immediately add 2mL of prepared 3g / L isophthaloyl chloride (TMC) carbon tetrachloride solution dropwise to carry out interfacial polymerization for 1min. After the reaction is completed, soak the film in carbon tetrachloride to wash off excess of isophthaloyl chloride. Finally, the membrane was heated at 60 °C for 30 min, rinsed with pure water, soaked, and stored in deionized water.
[0077] After testing, the thin-film composite nanofiltration membrane prepared in this example was tested at a test temperature of 25° C. and an operating pressure of 4 bar. 2 SO 4 The flux of the aqueous solution is 23Lm -2 h -1 , the rejection rate is 98.6%; for 1000ppm MgSO 4 The flux of the ...
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