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Novel polyvinyl alcohol nanofiltration membrane preparation method

A technology of polyvinyl alcohol and nanofiltration membranes, applied in chemical instruments and methods, membrane technology, semipermeable membrane separation, etc., can solve the problems of water permeability reduction and achieve improved wettability, increased strength, high permeability selectivity and Effect of Pollution Resistance

Active Publication Date: 2017-07-04
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Cross-linking modification increases the water resistance and mechanical strength of PVA, but at the same time reduces the water permeability of the membrane

Method used

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  • Novel polyvinyl alcohol nanofiltration membrane preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Mix ethylene glycol methyl ether and pure water in a mass ratio of 1:1 to form a solvent, use it as a solvent to add terephthalaldehyde and sodium dodecylsulfonate with mass fractions of 0.1% and 0.15% respectively, heat and stir Dissolve to make a crosslinking agent solution; dissolve polyvinyl alcohol in deionized water with a mass fraction of 0.05%, heat and stir at 60°C for 1.5 hours to make an aqueous solution. Pour the crosslinking agent solution on the polysulfone bottom film, let it stand for five minutes to pour off the excess solvent, put it in an oven at 28°C until the solvent is dried; then pour polyvinyl alcohol aqueous solution on the surface of the film, and dry it at 70°C 10 minutes to form a film.

[0013] Tested under the pressure of 0.8MPa, the permeation flux of the membrane is 142.5L / m 2 .h, for Na 2 SO 4 The rejection rates of xylenol orange and semi-xylenol orange were 74.7% and 94%, respectively.

Embodiment 2

[0015] Change the mass fraction of terephthalaldehyde in the crosslinking agent solution, other steps are the same as in Example 1, prepare a composite film and test, and the results are as follows:

[0016] .

Embodiment 3

[0018] Change the mass fraction of sodium dodecylsulfonate in the crosslinking agent solution, the mass fraction of PVA is 0.1%, and the other steps are the same as in Example 1, and the composite membrane is prepared and tested, and the results are as follows:

[0019] .

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Abstract

The invention discloses a novel polyvinyl alcohol nanofiltration membrane and a preparation method thereof. The method comprises the following steps: 1) mixing and dissolving ethylene glycol monomethyl ether and deionized water according to mass ratio of 1: 1 to prepare a solvent, respectively adding terephthalaldehyde and sodium dodecanesulphonate in the above solvent to prepare a mixing solution, heating the above mixing solution to the temperature of 60-65 DEG C, and stirring and dissolving the material to obtain a cross-linking agent solution; 2) dissolving the polyvinyl alcohol in deionized water to prepare an aqueous solution with mass fraction of 0.05-0.1%, heating the above aqueous solution to the temperature of 90-100 DEG C and stirring the material for 1.5 hours to prepare a polyvinyl alcohol aqueous solution; and 3) pouring the prepared cross-linking agent on a polysulfone base membrane, standing the material for 5 min and removing the superfluous solvent, placing the material in a baking oven at the temperature of 28 DEG C and drying the material; pouring the prepared polyvinyl alcohol aqueous solution on the surface of the membrane, and transferring the material into the baking oven and drying the material at the temperature of 60-90 DEG C for forming the membrane. The prepared polyvinyl alcohol nanofiltration membrane has high penetration selectivity and pollution-resistant performance, the method is easy to carry out, and a used modifier is easily available.

Description

technical field [0001] The invention belongs to the field of filter membrane preparation, and in particular relates to a preparation method of a novel polyvinyl alcohol nanofiltration membrane. Background technique [0002] Polyvinyl alcohol (PVA) is the product of polyvinyl acetate hydrolysis, which is white powder, flocculent or flake solid, non-toxic and non-corrosive; strict linear structure, a large number of hydroxyl groups in the molecular chain can be cross-linked to form macromolecules network. PVA has good water solubility, film-forming and cohesive properties, and can spontaneously form a gel layer. However, pure PVA membranes are easy to swell or even dissolve in water, have high permeability to water and solutes, and even have no retention of salt. So it needs to be modified to improve its water resistance. [0003] Therefore, people have carried out a lot of research on the modification of PVA composite membranes, such as using chemical cross-linking methods...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/82B01D69/02B01D67/00B01D61/00
Inventor 周勇郭淼高从堦
Owner ZHEJIANG UNIV OF TECH
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