Composite membrane with heterostructure separation layer and preparation method of composite membrane

A technology of heterostructure and separation layer, applied in semi-permeable membrane separation, chemical instruments and methods, membrane technology, etc., can solve the problem that the spatial distribution of permeability of composite membrane is difficult to control accurately, and achieve precise control of size and spatial distribution. , to improve flexibility and controllability, the effect of simple operation

Active Publication Date: 2021-10-12
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is a new type of composite membrane with a heterogeneous structure separation layer to solve the problem that the permeability and spatial distribution of the composite membrane are difficult to precisely control and optimize the flux distribution in the membrane module

Method used

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  • Composite membrane with heterostructure separation layer and preparation method of composite membrane
  • Composite membrane with heterostructure separation layer and preparation method of composite membrane
  • Composite membrane with heterostructure separation layer and preparation method of composite membrane

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Embodiment 1

[0052] This embodiment 1 provides a method for preparing a composite membrane with a heterogeneous structure separation layer, comprising the following steps:

[0053] (1) m-phenylenediamine is dissolved in water to obtain the first aqueous phase solution, and the mass concentration of m-phenylenediamine is 2%;

[0054] (2) Soak five pieces of polysulfone ultrafiltration basement membranes in the first aqueous phase solution, take them out after soaking for 1 minute, and dry the residual aqueous phase solution on the surface with an air knife;

[0055] (3) Dissolving piperazine in water to obtain a second aqueous phase solution, and adding it to a blank ink cartridge of an inkjet printing device as printing ink, the mass concentration of piperazine is 0.1%;

[0056] (4) if figure 2 As shown, design 5 checkerboard printing patterns, in which the proportions of filled areas are 0%, 20%, 40%, 60% and 80% respectively, and are obtained in step (2) according to the designed patte...

Embodiment 2

[0064] This embodiment 2 provides a method for preparing a composite membrane with a heterogeneous structure separation layer, comprising the following steps:

[0065] (1) Dissolve tannic acid and ferric chloride hexahydrate in deionized water to form tannic acid-iron complex intermediate layer precursor solution, and add it to the blank ink cartridge of inkjet printing equipment as printing ink, tannic acid and The mass concentration of ferric chloride hexahydrate is 0.1%;

[0066] (2) Design 5 checkerboard printing patterns, in which the proportion of filling area is 0%, 20%, 40%, 60% and 80% respectively; by inkjet printing according to the designed pattern in the polyethersulfone ultrafiltration The base film surface spraying step (1) described intermediate layer precursor liquid, forms 5 base films with patterned intermediate layer and intermediate layer coverage different, wherein the spraying position of precursor liquid depends on the position of printing pattern filli...

Embodiment 3

[0076] This embodiment 3 provides a method for preparing a composite membrane with a heterogeneous structure separation layer, comprising the following steps:

[0077] (1) disperse graphene oxide in deionized water to form an intermediate layer precursor, and add it to a blank ink cartridge of an inkjet printing device as printing ink, and the mass concentration of graphene oxide is 0.2%;

[0078] (2) Refer to Figure 4 , design a printing pattern in which the proportion of the filling area gradually changes from 5% to 95% along the lateral direction, and print the intermediate layer precursor solution described in step (1) onto the surface of the polyacrylonitrile ultrafiltration base membrane with a length of 1 meter according to the pattern, wherein The spraying position of the precursor liquid depends on the position of the printed pattern filling area;

[0079] (3) ethylenediamine is dissolved in water to obtain an aqueous phase solution of ethylenediamine, and the mass ...

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Abstract

The invention discloses a composite membrane with a heterostructure separation layer and a preparation method of the composite membrane.A porous support base membrane is adopted to adsorb a water-phase organic amine monomer, then a second water-phase organic amine monomer is controllably deposited in a specific area on the surface of the porous support base membrane through ink-jet printing; the difference of interfacial polymerization reactions in different areas is utilized to form a continuous separation layer composed of at least two different structures, namely a heterostructure separation layer, is formed, or a patterned intermediate layer composed of at least two regions is constructed on the surface of the porous support base membrane in an ink-jet printing mode, then interfacial polymerization reaction is performed on the surface of the patterned intermediate layer; by means of the difference of polymerization reaction in different intermediate layer regions, a heterostructure separation layer can be formed. According to the composite membrane with the heterostructure separation layer and the preparation method of the composite membrane of the invention, by changing the distribution proportion distribution of different structures in the heterostructure separation layer, accurate regulation and control of the permeability and spatial distribution of the membrane are realized; and when the composite membrane is used in a water treatment process, control and optimization of flux distribution in the membrane assembly can be realized.

Description

technical field [0001] The invention relates to the technical field of membrane preparation, in particular to a composite membrane with a heterogeneous structure separation layer and a preparation method thereof. Background technique [0002] Membrane separation, as a simple, efficient and environmentally friendly separation technology, has attracted much attention in today's circular economy era, and is considered to be a key technology to solve the problems of water pollution and shortage of clean water resources. Among them, the pressure-driven membrane separation process represented by reverse osmosis and nanofiltration has been widely used in advanced water treatment fields such as "zero discharge" and "recycling" of industrial wastewater, seawater / brackish water desalination, etc. An important guarantee for harmonious development with nature. The core of membrane separation technology lies in the membrane. At present, reverse osmosis membranes and nanofiltration membr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D67/00B01D69/12B01D69/10
CPCB01D67/0002B01D67/0006B01D69/125B01D69/12B01D69/10Y02A20/131
Inventor 蒋驰侯影飞田蕾李鹏
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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