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Phenol-amine alternately-assembled composite nano-filtration film and preparation method thereof

A composite nanofiltration membrane and phenolic amine technology, which is applied in the field of membrane separation, can solve the problems of affecting the performance of the separation membrane, the weak binding force between the separation membrane and the porous base membrane, and the number of separation membranes, so as to achieve regular arrangement, improve stability, and operate simple effect

Active Publication Date: 2018-04-06
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this preparation method, polyphenols / polyamines form a thin film at the liquid surface and then transfer to the surface of the porous base membrane. performance

Method used

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  • Phenol-amine alternately-assembled composite nano-filtration film and preparation method thereof
  • Phenol-amine alternately-assembled composite nano-filtration film and preparation method thereof
  • Phenol-amine alternately-assembled composite nano-filtration film and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] Take 1g of tannic acid and dissolve it in the prepared N-N bishydroxyethylglycine (Bicine) buffer solution at a concentration of 1g / L, adjust the pH to 4-5 with 0.1M NaOH solution; then take 1g of polyethylene Imine (weight-average molecular weight Mw=600Da) was dissolved in deionized water at a concentration of 1 g / L, and the pH was adjusted to 8-9 with 0.1 M HCl solution.

[0058] Use the polysulfone ultrafiltration membrane (with a molecular weight cut-off of 5-100,000 Da) as the porous polymer support membrane, firstly immerse it in the positively charged polyethyleneimine solution, and fully infiltrate it for 5 minutes; after taking it out, wash it with deionized water After rinsing and drying, immerse again in negatively charged tannic acid solution for 5 minutes of reaction (Michael addition and Schiff base reaction and subsequent polymerization reaction). After the end, take out the polysulfone ultrafiltration membrane, rinse it with deionized water again, put i...

Embodiment 2～4

[0061] The concentrations of the polyamines in Examples 2-4 are 2g / L, 3g / L and 4g / L respectively, and other conditions are the same as in Example 1.

[0062] The water flux and desalination rate of the composite nanofiltration membranes prepared in Examples 1-4 were tested, and the results are shown in Table 1.

[0063] The water flux and MgCl of the composite nanofiltration membrane prepared in table 1 embodiment 1~4 2 Salt rejection rate

[0064] test

Embodiment 5

[0075] Take 1g of dopamine and dissolve it in the prepared Tris-HCl buffer solution at a concentration of 1g / L, adjust the pH to 4-5 with 0.1M NaOH solution; then take 2g The o-phenylenediamine was dissolved in deionized water at a concentration of 2 g / L, and the pH was adjusted to 8-9 with 0.1 M HCl solution.

[0076] The polyacrylonitrile ultrafiltration membrane (molecular weight cut-off of 100,000-200,000 Da) is used as a porous polymer support membrane (the membrane is first pretreated with alkali solution), first immersed in o-phenylenediamine solution, and fully infiltrated after 10 minutes Rinse with deionized water after taking it out, immerse in the dopamine solution again after drying and carry out the reaction for 10min (Michael addition and Schiff base reaction and subsequent polymerization reaction). After the end, take out the polyacrylonitrile ultrafiltration membrane, rinse it with deionized water again, put it in a vacuum drying oven after drying, and activat...

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Abstract

The invention discloses a preparation method of a phenol-amine alternately-assembled composite nano-filtration film. The preparation method comprises the following steps: (1) dipping a porous supportfilm in a polyamine monomer solution, taking out, washing the surface of the porous support film, and airing, wherein a polyamine monomer is at least one of o-phenylenediamine, m-phenylenediamine, p-phenylenediamine, diethylenetriamine, triethylene tetramine, polyethyleneimine and piperazine, and the concentration of the polyamine monomer in the polyamine monomer solution is 0.1g / L-10g / L; and (2)dipping the aired porous support film in a polyphenol monomer solution, taking out, washing the surface of the porous support film, airing, and activating, so as to obtain the nano-filtration film, wherein a polyphenol monomer is at least one of catechol, dopa, dopamine, tannic acid, tea polyphenol and bisphenol fluorine, and the concentration of the polyphenol monomer in the polyphenol monomer solution is 0.1g / L-10g / L. The invention further discloses the composite nano-filtration film prepared by virtue of the preparation method. The composite nano-filtration film has the advantages of high flux and desalinization rate, good long-term operational stability and the like.

Description

technical field [0001] The invention relates to the technical field of membrane separation, in particular to a composite nanofiltration membrane with phenolamines alternately assembled and a preparation method thereof. Background technique [0002] Nanofiltration is a new type of pressure-driven membrane separation technology. The separation performance is between ultrafiltration and reverse osmosis. It has good separation and retention capabilities for multivalent salt ions and small organic molecules (molecular weight 200-1000Da). Its technical feature is that through the size sieving effect of space and electrostatic effect, larger substances with the same charge as the membrane surface are retained, while substances with smaller filter apertures and opposite charges are easier to pass through nanofiltration. membrane. [0003] A common method for preparing nanofiltration membranes is to construct a selective separation layer on a porous support membrane substrate. Comm...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/82B01D69/12B01D67/00B01D69/02
CPCB01D69/02B01D69/12B01D69/125B01D71/82
Inventor 徐志康杨熙林福文杜勇陈志雄
Owner ZHEJIANG UNIV
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