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Method for preparing polyelectrolyte composite nanofiltration membrane by using freeze drying technology

A polyelectrolyte and composite membrane technology, applied in the field of membrane separation, can solve the problems of difficult to obtain optimal membrane conditions, difficult to control the membrane process, large thickness of nanofiltration membrane, etc. simple effect

Active Publication Date: 2019-01-08
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[CN105013333A, CN106621849 A, CN1817427, CN106693732A and CN103551049A] The nanofiltration membrane prepared by the phase inversion method is relatively thick and the membrane flux is relatively low; the surface graft polymerization method involves complex chemical reactions, and there are many factors affecting the film formation process. The film-making process is not easy to control, and it is difficult to obtain the optimal film-making conditions

Method used

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  • Method for preparing polyelectrolyte composite nanofiltration membrane by using freeze drying technology
  • Method for preparing polyelectrolyte composite nanofiltration membrane by using freeze drying technology

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The commercial porous membrane is made of alumina material, in the form of a tubular ultrafiltration membrane with a membrane pore size of 0.1 μm and a membrane area of ​​10 cm 2 , the selected polyanion is sodium alginate, the polycation is polyethyleneimine, and the selected solvent is deionized water.

[0022] Preparation method of f-SA / PEI composite nanofiltration membrane

[0023] (1) Rinse and pre-treat the aluminum oxide film with a length of about 5 cm with deionized water to remove organic matter, inorganic matter and microorganisms on the surface, and then dry it in an oven at 50°C;

[0024] (2) Polyethyleneimine was dissolved in deionized water to obtain solution A, and sodium alginate was dissolved in deionized water to obtain solution B. The concentrations of the two solutions were 0.05wt.% and 3.00wt.% respectively;

[0025] (3) Soak the treated alumina-based film in the prepared A solution for 3.5 hours, take it out and clean it, and then put it into an ...

Embodiment 2

[0030] The commercial porous membrane is made of alumina material, in the form of a tubular ultrafiltration membrane, with a membrane pore size of 1 μm and a membrane area of ​​10 cm 2 , the selected polyanion is sodium alginate, the polycation is polyethyleneimine, and the selected solvent is deionized water.

[0031] Preparation method of f-SA / PEI composite nanofiltration membrane

[0032] (1) Rinse and pre-treat the aluminum oxide film with a length of about 5 cm with deionized water to remove organic matter, inorganic matter and microorganisms on the surface, and then dry it in an oven at 50°C;

[0033] (2) Polyethyleneimine was dissolved in deionized water to obtain solution A, and sodium alginate was dissolved in deionized water to obtain solution B. The concentrations of the two solutions were 3.00wt.% and 0.05wt.% respectively;

[0034] (3) Soak the treated alumina-based film in the prepared A solution for 0.5h, then take it out for cleaning, and finally put it into a...

Embodiment 3

[0039] The commercial porous membrane is made of alumina material, in the form of a tubular ultrafiltration membrane with a membrane pore size of 0.1 μm and a membrane area of ​​10 cm 2 , the selected polyanion is sodium alginate, the polycation is polyethyleneimine, and the selected solvent is deionized water.

[0040]Preparation method of f-SA / PEI composite nanofiltration membrane

[0041] (1) Rinse and pre-treat the aluminum oxide film with a length of about 5 cm with deionized water to remove organic matter, inorganic matter and microorganisms on the surface, and then dry it in an oven at 50°C;

[0042] (2) Polyethyleneimine was dissolved in deionized water to obtain solution A, and sodium alginate was dissolved in deionized water to obtain solution B. The concentrations of the two solutions were 0.25wt.% and 1.00wt.% respectively;

[0043] (3) Soak the treated alumina-based film in the prepared A solution for 1 hour, then take it out for cleaning, and finally put it into...

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Abstract

The invention discloses a method for preparing a polyelectrolyte composite nanofiltration membrane by using a freeze drying technology, and belongs to the field of membrane separation. The method comprises the following steps: pretreating porous basement membranes, and removing surface impurities; dissolving polycations and polyanions into a solvent respectively to form respective solution; carrying out static assembling on the pretreated basement membranes in the polycation solution, then washing with deionized water, removing the polycations which are not adsorbed on the surfaces of the basement membranes, and naturally volatilizing the solvent at room temperature; combining the polyanions with negative charges with the polycations with positive charges by using a dynamic assembling form, and assembling the polyanions and the polycations onto the surface of the obtained membrane through the effect of ionic bonds; putting the obtained assembled membrane into a freeze drying machine, and completely carrying out ice crystallization on the solvent in a polyelectrolyte composite membrane in the condition of low temperature, and then carrying out sublimation drying to prepare the polyelectrolyte composite nanofiltration membrane which is used for removal of water system small molecular substances and has good separation and stability.

Description

technical field [0001] The invention relates to a method for preparing a polyelectrolyte composite nanofiltration membrane by adopting freeze-drying technology. The membrane can be used for removing organic substances such as dyes in water, and belongs to the field of membrane separation. Background technique [0002] As a new separation technology, membrane technology not only has the functions of separation, concentration and purification, but also has the advantages of simple operation, high efficiency, energy saving and no secondary pollution compared with traditional separation processes, making it widely used in the separation field. focus on. As we all know, the evaluation of nanofiltration membranes with excellent performance requires both high flux and high rejection performance, and the key to membrane separation performance is the membrane structure. Therefore, finding a new method for membrane structure construction has become a key problem to be solved urgently....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D61/02B01D67/00B01D69/04B01D69/06B01D69/12B01D71/02B01D71/08B01D71/76C02F1/44
CPCB01D61/027B01D67/0079B01D69/04B01D69/06B01D69/12B01D71/024B01D71/025B01D71/027B01D71/08B01D71/76C02F1/442
Inventor 安全福张文海马骙王乃鑫纪树兰
Owner BEIJING UNIV OF TECH
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