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A kind of preparation method of composite forward osmosis membrane

A forward osmosis membrane and base membrane technology, applied in the field of composite forward osmosis membrane preparation, can solve the problems of low water flux, limited application range, membrane fouling, etc., and achieve simple method, improved performance, hydrophilicity and anti-pollution. Sex-enhancing effects

Inactive Publication Date: 2017-03-08
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The fully aromatic polyamide selective layer formed by m-phenylenediamine and trimesoyl chloride has high selectivity but low water flux due to the relatively dense cross-network structure
And because the surface is relatively hydrophobic and rough, it is easy to form membrane fouling, and the application range is limited.

Method used

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  • A kind of preparation method of composite forward osmosis membrane
  • A kind of preparation method of composite forward osmosis membrane
  • A kind of preparation method of composite forward osmosis membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Step 1: Dissolve 0.5g N-[3-(trimethoxysilyl)propyl]ethylenediamine and 1.5g m-phenylenediamine in 98g deionized water to form an aqueous solution with a mass fraction of 2%; The mass fraction of acid chloride is 0.1% n-hexane solution.

[0031] Step 2: Soak a piece of polyacrylonitrile microfiltration membrane in the aqueous solution for 30 minutes, remove the surface moisture with a rubber rod after taking it out; fix the polyacrylonitrile membrane with a special frame, and pour n-hexane solution into it for 60 seconds; The n-hexane solution was discarded to obtain a composite forward osmosis membrane.

Embodiment 2

[0033] Repeat Example 1 with the same steps described above, except that the mass of N-[3-(trimethoxysilyl)propyl]ethylenediamine is 1.0 g, and the mass of m-phenylenediamine is 1.0 g.

Embodiment 3

[0035] Repeat Example 1 with the same steps described above, except that the mass of N-[3-(trimethoxysilyl)propyl]ethylenediamine is 1.5 g, and the mass of m-phenylenediamine is 0.5 g.

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Abstract

The invention discloses a preparation method of a composite forward-permeation film. The preparation method comprises the steps that silicone-bearing aliphatic diamine is used for partially replacing polyamine to be used as a solute of a water solution, a basement film is fully dipped in the water solution and then taken out, water on the surface of the basement film is removed, one face of the basement film is in contact with an organic solution, so that the surface of the basement film conducts an interfacial polymerization reaction, and then the needed composite forward-permeation film is obtained. According to the preparation method of the composite forward-permeation film, the silicone-bearing aliphatic diamine containing a diamine and siloxane structure is introduced, so that the performance of the prepared composite forward-permeation film is improved, amidogen is used as an active group to take part in the interfacial polymerization reaction, siloxane can be quite easily hydrolyzed, silicon dioxide is converted into hydrophilic hydroxyl, and the permeability, the hydrophilia and the anti-fouling performance of the composite forward-permeation film are improved.

Description

technical field [0001] The invention belongs to the field of synthesis of membrane materials, and more specifically relates to a preparation method of a composite forward osmosis membrane. Background technique [0002] Forward osmosis (FO) is a new type of membrane separation technology, which directly uses the osmotic pressure difference of the solution on both sides of the membrane as the driving force without external pressure. Compared with reverse osmosis (RO) technology, it has the advantage of saving energy. The application range of forward osmosis technology is very wide, and it has good application prospects in seawater desalination, sewage treatment, industrial wastewater treatment, landfill leachate treatment, food processing, medical treatment and other fields. [0003] As one of the cores of forward osmosis technology, forward osmosis membrane has been widely concerned by researchers. Since Cadotte first proposed in 1979 to use m-phenylenediamine and trimesoyl ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/42B01D69/12B01D69/02B01D67/00
Inventor 王艳熊舒
Owner HUAZHONG UNIV OF SCI & TECH