Ionic liquid modified positively charged composite nanofiltration membrane and preparation method thereof
A composite nanofiltration membrane and ionic liquid technology, applied in the field of positively charged composite nanofiltration membrane and its preparation, can solve the problems of low permeation flux, poor film formation, poor compatibility between inorganic nanoparticles and polymer matrix, etc. To achieve the effect of simple process, easy industrial production, and industrial production
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[0038] The present invention also provides a method for preparing a positively charged composite nanofiltration membrane, which specifically includes the following steps:
[0039] 1) Configure a polyamine aqueous phase solution with a certain mass volume concentration;
[0040] 2) Bottom film treatment: immerse the surface of the bottom film in the polyamine water phase solution, so that its surface is immersed in the polyamine water phase solution, and use a rubber roller to remove the excess water phase solution on the surface, and set aside;
[0041] 3) Interfacial polymerization reaction: configure a multi-component acid chloride organic phase solution with a certain mass volume concentration, pour the organic phase solution into the surface of the bottom film treated in step 2) to make it carry out interfacial polymerization reaction, and remove the organic phase solution on the bottom film surface after a certain period of time. Organic phase solution to prepare nascent ...
Embodiment 1~4
[0059] The preparation method of the positively charged composite nanofiltration membrane modified by amino functionalized ionic liquid comprises the following steps:
[0060] Pour the piperazine aqueous solution with a mass volume concentration of 0.5% on the surface of the fixed polyacrylonitrile base film and cover it, let it stand for 1 minute to allow the piperazine aqueous solution to soak into the surface of the base film, and remove the surface of the base film by rolling with a rubber roller The excess piperazine aqueous solution is dried for subsequent use; the mass volume concentration of 0.15% trimesoyl chloride / toluene solution is poured into the surface of the dried base film, and the organic solution on the surface is removed after the interface polymerization for 30 seconds; the mass volume concentration 0.5%, 1%, 1.5%, and 2% 1-aminopropyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide salt / dichloromethane solutions were poured into the bottom film afte...
Embodiment 5
[0069] The positively charged composite nanofiltration membrane was prepared in a manner basically similar to that of Example 1, but polyethersulfone was selected as the supporting bottom membrane, and amino functionalized ionic liquid organic solutions of different structures were used to modify the preparation. The organic solution is a 1.5% 1-aminoethyl-3-methylimidazolium bromide / ethanol solution, thereby preparing a modified positively charged composite nanofiltration membrane.
[0070] The nanofiltration membrane made above is carried out performance test of pure water flux and salt rejection rate, test result shows, the pure water flux of described charged nanofiltration membrane is 55.23L / (m2 h), for MgCl 2 The rejection rate of LiCl is 92.2%, the rejection rate of LiCl is 16.3%, and the separation factor of magnesium and lithium is 0.12.
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