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Preparation method of novel positively-charged nanofiltration membrane

A positively charged, nanofiltration membrane technology, applied in the field of composite nanofiltration membrane preparation, can solve the problems of small flux of nanofiltration membranes, easy surface pollution, etc., and achieve the effects of simple preparation method, not easy to fall off, and reduced swelling effect

Active Publication Date: 2016-05-11
SHANDONG ZHAOJIN MOTIAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the problems of small flux and easy pollution of the nanofiltration membrane, the present invention selects cation-modified guar gum as the nanofiltration membrane material, and simultaneously controls the cross-linking of the material, and proposes a preparation of a positively charged nanofiltration membrane method

Method used

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  • Preparation method of novel positively-charged nanofiltration membrane
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  • Preparation method of novel positively-charged nanofiltration membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Prepare an aqueous solution of cationic guar gum with a mass concentration of 0.5%, and an aqueous solution of polyvinyl alcohol with a mass concentration of 0.5%. Mix the two solutions evenly at a ratio of 2:1 and raise the temperature to 45°C in a water bath, and configure a mass concentration of 0.2% boric acid. Aqueous solution, the temperature of the water bath is raised to 40°C, pour the boric acid aqueous solution on the surface of the polysulfone support membrane, cast and cover it, pour it into the waste liquid bucket after 30s, put it in an oven at 45°C for 30s, take it out, take the mixed solution and coat it with boric acid After 40 seconds, pour the surface of the supporting membrane treated with the aqueous solution into a waste liquid bucket, put it in an oven at 45°C for 2 minutes, and after taking it out, a transparent gel-like film layer is formed on the surface of the membrane, and the surface of the supporting membrane that has formed a gel-like film l...

Embodiment 2

[0017] Prepare a polyvinyl alcohol aqueous solution with a mass concentration of 1%, and raise the temperature to 45°C in a water bath, configure a 0.2% boric acid aqueous solution, heat up a water bath to 40°C, pour the boric acid aqueous solution on the surface of the polysulfone support membrane, cast and cover, 30s Then pour it into the waste liquid bucket, put it in a 45°C oven for 30s, take it out, take the polyvinyl alcohol aqueous solution and cover it on the surface of the support membrane that has been treated with the boric acid aqueous solution, pour it into the waste liquid barrel after 40s, and put it in a 45°C oven for drying After 2 minutes, a transparent gel-like film layer is formed on the surface of the film after taking it out, and the surface of the supporting film that has formed a gel-like film layer is coated with boric acid aqueous solution again, poured into the waste liquid bucket after 30 seconds, and then coated with polyvinyl alcohol aqueous solutio...

Embodiment 3-4

[0019] Change the massfraction of cationic guar gum aqueous solution, other steps are the same operation method as embodiment 1, prepare composite film and test, obtain the result as following table:

[0020]

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Abstract

The invention discloses a preparation method of a novel positively-charged nanofiltration membrane, in particular to a preparation method of a cross-linked cationic guar gum positively-charged nanofiltration membrane. The method includes preparing a cationic modified guar gum dissolved and polyvinyl alcohol water solution, a boric acid water solution and the like, treating a polysulfone support membrane with the boric acid water solution prior to treating with another mixed solution, and finally treating with the boric acid water solution again. The preparation method has the advantages that the guar gum belongs to a natural macromolecular substance and is low in cost, widely available, biodegradable, green and environmentally friendly, the cationic modified guar gum has positive charge and can form insoluble gel after being subjected to boric acid cross-linking, meanwhile, antifouling property of the membrane surface can be improved, high organics rejection effect is realized, and permeation flux of the membrane is heightened.

Description

Technical field: [0001] The invention relates to a preparation process of a composite nanofiltration membrane, in particular to a preparation method of a positively charged nanofiltration membrane made of a cross-linked cationic guar gum material. Background technique: [0002] Nanofiltration membrane is a new membrane separation technology between ultrafiltration and reverse osmosis. Its technical feature is to achieve selective permeation of dissolved components through steric hindrance and electrostatic interaction. Nanofiltration membranes are used to remove multivalent ions and small organic molecules with molecular weights in the range of about 200-1000 Daltons. Due to the advantages of low operating pressure and large permeation flux, the current preparation methods of nanofiltration membranes mainly include coating method, phase inversion method and interfacial polymerization method. [0003] Nanofiltration membrane separation has two characteristics, namely sieving...

Claims

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Application Information

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IPC IPC(8): B01D67/00B01D69/02B01D71/74B01D71/82
CPCB01D67/0006B01D69/02B01D71/74B01D71/82B01D2323/30B01D2325/16
Inventor 王乐译周勇王新艳张倩茹
Owner SHANDONG ZHAOJIN MOTIAN