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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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

There is currently no method for preparing high-performance

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

Examples

Experimental program
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Effect test

Example Embodiment

[0040] The preparation method of the present invention is as figure 1 As shown, first, the polyphenol / polyamine solution is configured in a certain ratio, and the hydrophobic base film is floated 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 period of time to obtain a thin-layer composite film.

[0041] The reaction mechanism is as figure 2 As shown, oxygen diffuses downward through the gas / liquid interface, the polyphenols in the solution are oxidized to form a quinone, and then Michael addition or Schiff base reaction occurs with the polyamines, and the polyphenol / polyamine complexes further at the gas / liquid interface Through the reaction, a cross-linked film structure is formed at the gas / liquid interface of the polymer porous base film; the film structure forms a dense selective functional skin layer through cross-linking, thereby obtaining the thin-layer c...

Example Embodiment

[0047] Example 1

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

[0049] The polyvinylidene fluoride microporous membrane was floated on the surface of the deposition solution and deposited at 20°C for 4 hours.

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

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

[0052] The cross-sectional topography (SEM) of the prepared thin-layer composite film is shown as figure 1 As shown, the thickness of the selective functional skin layer on the base film is about 60 nm. Its water flux is 53.3Lm -2 h -1 The desalination rate of magnesi...

Example

[0053] Examples 2~4

[0054] The polyvinylidene fluoride microporous membrane was replaced with polypropylene, polyethylene, and polyvinyl chloride microfiltration membranes, and the remaining 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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