Nano-filtration membrane, preparation method and applications of thereof
A nanofiltration membrane and composite membrane technology, applied in the field of nanofiltration membranes, can solve the problem that the retention rate of divalent ions is only 98%, and achieve the effects of increasing the crosslinking density, increasing the salt rejection rate, and improving the degree of crosslinking.
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[0040] The present invention also provides the preparation method of above-mentioned nanofiltration membrane, and this method comprises the following steps:
[0041] (1) forming a polyamide separation layer on one surface of the support layer to obtain a composite membrane;
[0042] (2) first contacting the composite film obtained in step (1) with the polyphenolic compound, so that the polyhydric phenolic compound and the polyamide undergo a crosslinking reaction;
[0043] (3) second contacting the composite membrane obtained in step (2) with polyvalent metal cations to chelate the polyvalent metal cations with polyhydric phenolic compounds.
[0044] In the method of the present invention, the support layer is not particularly limited, it can be made of various existing materials with certain strength and can be used for nanofiltration membranes, usually polyester, polyacrylonitrile , polyvinylidene fluoride, phenolphthalein type non-sulfonated polyarylethersulfone, polyether...
Embodiment 1
[0083] The nanofiltration membrane M1 prepared according to the method of Comparative Example 1 was immersed in an aqueous solution containing 1% by weight of tannic acid, the temperature of the immersion solution was 25° C., and the immersion time was 1 min. After taking it out, wash it with deionized water. The membrane was then immersed in 1 wt% MgSO 4 In the aqueous solution, the immersion temperature is 25°C, and the immersion time is 5min. After taking it out, wash it with deionized water. Put the diaphragm into the cross-flow membrane tank, and under 0.2Mpa, use deionized water as the medium, pre-press for 120min, and obtain the nanofiltration membrane N1 with a surface modified membrane formed on the surface of the polyamide separation layer, wherein the surface modification The thickness of the permanent film is 0.060 μm.
Embodiment 2
[0085] The nanofiltration membrane M1 prepared according to the method of Comparative Example 1 was soaked in an aqueous solution containing 5% by weight of tannic acid, the temperature of the soaking solution was 25° C., and the soaking time was 5 minutes. After taking it out, wash it with deionized water. The membrane was then immersed in 2 wt% MgSO 4 In the aqueous solution, the immersion temperature is 25°C, and the immersion time is 30s. After taking it out, wash it with deionized water. Put the diaphragm into the cross-flow membrane tank, under 0.1Mpa, use deionized water as the medium, pre-press for 120min, and obtain the nanofiltration membrane N2 with the surface modified membrane formed on the surface of the polyamide separation layer, wherein the surface modification The thickness of the permanent film is 0.064 μm.
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