Composite nanofiltration film and preparation method thereof
A technology of composite nanofiltration membrane and ultrafiltration base membrane, which is applied in the field of composite nanofiltration membrane and its preparation, and can solve the problems of polyamide composite nanofiltration membranes such as hydrophilicity and low absolute value of volume charge density
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[0064] The preparation method of the ultrafiltration base membrane is not particularly limited. For example, the ultrafiltration base membrane can be prepared by unidirectional / biaxial stretching, non-solvent-induced gel phase inversion (NIPs) or thermally induced phase separation (TIPs).
[0065] The surface active layer of the composite nanofiltration membrane of the present invention includes the reaction product of chitosan quaternary ammonium salt, β-cyclodextrin and a crosslinking agent. In the present invention, the substances contained in the surface active layer are mainly or all the reaction products of chitosan quaternary ammonium salt, β-cyclodextrin and crosslinking agent. The mass of the reaction product of the chitosan quaternary ammonium salt, β-cyclodextrin and the crosslinking agent usually accounts for more than 90% by weight of the total mass of the surface active layer, such as more than 95% by weight, more than 99% by weight, or 100% by weight. In the surfac...
Example Embodiment
[0113] Example 1
[0114] In this embodiment, preparing a positively charged composite nanofiltration membrane of chitosan quaternary ammonium salt / β-cyclodextrin includes the following steps:
[0115] (1) Preparation of chitosan quaternary ammonium salt: use chitosan (CS) and dimethyldiallylammonium chloride (DMDAAC) as raw materials, and ammonium persulfate as initiator to synthesize dimethyldiallyl Chitosan quaternary ammonium salt grafted with ammonium chloride;
[0116] (2) Put 0.3w / v% PVA(M w : 2,500Da) The aqueous solution is coated on a polysulfone ultrafiltration base membrane with a molecular weight cut-off (MWCO) of 30,000 Da to form an intermediate layer between the active layer and the ultrafiltration membrane, and dry;
[0117] (3) 0.8 g of the chitosan quaternary ammonium salt prepared in step (1) and 0.2 g of β-cyclodextrin were dissolved in 100 ml of deionized water to obtain an aqueous solution. Soak the polysulfone ultrafiltration base membrane treated in step (2) ...
Example Embodiment
[0127] Example 2
[0128] In this embodiment, preparing a positively charged composite nanofiltration membrane of chitosan quaternary ammonium salt / β-cyclodextrin includes the following steps:
[0129] (1) Prepare the chitosan quaternary ammonium salt grafted with dimethyl diallyl ammonium chloride by the method in Example 1;
[0130] (2) Put 0.2w / v% PVA(M w (2500Da) aqueous solution is coated on the polyacrylonitrile ultrafiltration base membrane (MWCO is 20,000Da) to form an intermediate layer between the active layer and the ultrafiltration membrane, and dry;
[0131] (3) Dissolve 1.0 g of the chitosan quaternary ammonium salt prepared in step (1), 0.3 g β-cyclodextrin, 0.01 g lithium chloride and 0.02 g sodium dodecyl sulfonate in 100 ml of deionized water to obtain Aqueous solution: After immersing the polyacrylonitrile (PAN) ultrafiltration base membrane treated in step (2) in the aqueous solution for 5 minutes, remove the excess aqueous solution on the surface of the ultrafiltr...
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