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Thin-layer composite film based on gas-liquid interface reaction, and preparation method and applications thereof

A technology of liquid interface and composite membrane, which is applied in the field of membrane separation, and achieves the effect of simple preparation method, strong controllability and improved scope of application

Active Publication Date: 2017-09-15
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There is currently no method for preparing high-performance thin-film composite membranes using the gas / liquid interface

Method used

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  • Thin-layer composite film based on gas-liquid interface reaction, and preparation method and applications thereof
  • Thin-layer composite film based on gas-liquid interface reaction, and preparation method and applications thereof
  • Thin-layer composite film based on gas-liquid interface reaction, and preparation method and applications thereof

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Experimental program
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Effect test

preparation example Construction

[0040] The preparation method of the present invention is as figure 1 As shown, first configure the polyphenol / polyamine solution according to a certain ratio, and float the hydrophobic basement membrane on the surface of the solution. After reacting for a certain period of time, the base film is placed in an aqueous solution of glutaraldehyde for cross-linking for a certain period of time to obtain a thin-layer composite membrane.

[0041] The mechanism of its reaction is as figure 2 As shown, oxygen diffuses downward through the gas / liquid interface, and the polyphenols in the solution are oxidized to form quinones, which then undergo Michael addition or Schiff base reactions with polyamines, and the polyphenol / polyamine complexes further develop at the gas / liquid interface. reaction, a cross-linked thin film structure is formed at the air / liquid interface of the polymer porous base membrane; the thin-film structure forms a dense selective functional skin layer through cro...

Embodiment 1

[0048] Select dopamine and polyethyleneimine (weight average molecular weight 600) as polyphenols and polyamine monomers, dissolve dopamine and polyethyleneimine in Tris-HCl buffer solution according to the mass concentration ratio of 4:1, wherein dopamine and polyethyleneimine concentrations were 2g / L and 0.5g / L.

[0049] Float the polyvinylidene fluoride microporous membrane on the surface of the deposition solution and deposit it at 20° C. for 4 hours.

[0050] Finally, the prepared film was cross-linked in 10% glutaraldehyde solution at 70°C for 2 hours.

[0051] Finally, after washing with water and drying, a thin-layer composite film is obtained.

[0052] The cross-sectional morphology (SEM) of the prepared thin-layer composite film is as follows: figure 1 As shown, the thickness of the selective functional cortex on the basement membrane is about 60nm. Its water flux is 53.3Lm -2 h -1 , the desalination rate of magnesium chloride is 95.1%.

Embodiment 2～4

[0054] The polyvinylidene fluoride microporous membrane was replaced with polypropylene, polyethylene, and polyvinyl chloride microfiltration membranes, and the rest of the conditions were the same as in Example 1.

[0055]

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Abstract

The invention discloses a preparation method of a thin-layer composite film based on gas-liquid interface reaction. The preparation method comprises following steps: 1, floating of a hydrophobic polymer porous base film on the surface of a deposition liquid is carried out, reaction is carried out for 0.1 to 12h at 10 to 90 DEG C so as to form a thin film structure on a polymer porous base film at a gas / liquid interface, wherein the deposition liquid is a solution of a polyphenol monomer and a polyamine monomer, and pH value of the deposition liquid ranges from 6 to 10; and 2, the polymer porous base film obtained in step 1 is delivered into a cross-linking agent solution for cross-linking reaction, so that a selective functional skin layer is formed thin film structure crosslinking of the polymer porous base film, and the thin-layer composite film based on gas-liquid interface reaction is obtained. The preparation method is high in controllability. The thin-layer composite film can be applied in fields such as nanofiltration, reverse osmosis, forward osmosis, or osmosis gasification.

Description

technical field [0001] The invention relates to the technical field of membrane separation, in particular to a thin-layer composite membrane based on gas / liquid interface reaction and its preparation method and application. Background technique [0002] Thin-layer composite membrane refers to a type of separation membrane material composed of a porous support layer and a dense separation thin layer. It has the advantages of high pressure resistance, high flux, high selectivity, etc., and is widely used in nanofiltration, positive / Reverse osmosis, permeation gasification and other fields. At present, the methods for preparing thin-layer composite films mainly include interfacial polymerization, layer-by-layer self-assembly, surface coating, and chemical vapor deposition. [0003] For example, the Chinese patent with the publication number CN105498547A discloses a preparation method of a hollow fiber composite nanofiltration membrane. Fillers such as carbon nanotubes are ad...

Claims

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Application Information

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IPC IPC(8): B01D71/82B01D69/12B01D69/10B01D69/02B01D67/00
CPCB01D67/0002B01D69/02B01D69/10B01D69/12B01D71/82B01D2325/26
Inventor 徐志康吴铭榜杨皓程林福文
Owner ZHEJIANG UNIV
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