Preparation method of composite forward osmosis membrane

A forward osmosis membrane and membrane solution technology, applied in the field of composite forward osmosis membrane preparation, can solve problems such as low membrane flux, and achieve the effects of increasing retention capacity, improving water flux, and improving transmission

Active Publication Date: 2014-08-06
ETERNAL GUANGDONG TECH ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the forward osmosis membrane is still in the research and development stage. At present, only the American Hydration Technology Innovations (HTI) company in the world can commercially produce cellulose acetate forward osmosis membrane, but the application process is still limited by the pH condition of the treatment solution, and the membrane flux is relatively low. Low

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] An embodiment of the preparation method of the composite forward osmosis membrane described in the present invention, this embodiment uses boron nitride nanotubes, and the preparation method includes the following steps:

[0025] (1) the anionic surfactant ammonium oleate aqueous solution and the boron nitride nanotube are mixed by the ratio of adding 4 milligrams of boron nitride nanotubes per 1 milliliter of anionic surfactant with a mass concentration of 3%, and then the mixture is ultrasonically dispersed for 3 Hours, relying on the affinity of surfactant carboxylate anions to nitrogen atoms on the surface of boron nitride nanotubes to achieve surface coating, and the filtered product was dried at 80 degrees Celsius to obtain surface-modified boron nitride nanotubes.

[0026] (2) Soak the support material with a thickness of 80 microns and made of non-woven fabric in an alkaline solution with a pH of 12, and ultrasonically for more than 30 minutes at the same time, t...

Embodiment 2

[0031] An embodiment of the preparation method of the composite forward osmosis membrane described in the present invention, this embodiment uses boron nitride nanotubes, and the preparation method includes the following steps:

[0032] (1) the anionic surfactant ammonium oleate aqueous solution and the boron nitride nanotube are mixed by the ratio of adding 4 milligrams of boron nitride nanotubes per 1 milliliter of anionic surfactant with a mass concentration of 3%, and then the mixture is ultrasonically dispersed for 3 Hours, relying on the affinity of surfactant carboxylate anions to nitrogen atoms on the surface of boron nitride nanotubes to achieve surface coating, and the filtered product was dried at 80 degrees Celsius to obtain surface-modified boron nitride nanotubes.

[0033] (2) Soak the support material with a thickness of 120 microns and made of polyester mesh in an alkaline solution with a pH of 13, and ultrasonically for more than 30 minutes at the same time, th...

Embodiment 3

[0038] An embodiment of the preparation method of the composite forward osmosis membrane described in the present invention, this embodiment uses boron nitride nanotubes, and the preparation method includes the following steps:

[0039] (1) the anionic surfactant ammonium oleate aqueous solution and the boron nitride nanotube are mixed by the ratio of adding 4 milligrams of boron nitride nanotubes per 1 milliliter of anionic surfactant with a mass concentration of 3%, and then the mixture is ultrasonically dispersed for 3 Hours, relying on the affinity of surfactant carboxylate anions to nitrogen atoms on the surface of boron nitride nanotubes to achieve surface coating, and the filtered product was dried at 80 degrees Celsius to obtain surface-modified boron nitride nanotubes.

[0040] (2) Soak the support material with a thickness of 40 microns and made of non-woven fabric in an alkaline solution with a pH of 14, while ultrasonicating for more than 30 minutes, then wash it wi...

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Abstract

The invention provides a preparation method of a composite forward osmosis membrane. A nanotube and cellulose triacetate are combined, the nanotube has a good water channel, the transferring speed of water molecules in the forward osmosis membrane is increased, the water flux in a forward osmosis process is greatly improved, the saline ion interception capability is improved, and the salt intercepting rate of the forward osmosis membrane is improved due to the special cavity structure of the nanotube. The invention also provides the composite forward osmosis membrane prepared by the method. The composite forward osmosis membrane has high water flux and high salt intercepting rate.

Description

technical field [0001] The invention relates to a preparation method of a forward osmosis membrane, in particular to a preparation method of a composite forward osmosis membrane with relatively high water flux and salt cut-off rate. Background technique [0002] Globally, fresh water resources have been depleted day by day, and seawater desalination technology is receiving more and more attention. Therefore, membrane separation technology is being widely concerned by scientists. Among them, forward osmosis technology is a membrane separation technology developed in recent years, and it is a technology that relies on solution osmotic pressure as a driving force to achieve target solution separation. Since the forward osmosis process is a spontaneous process, it has the characteristics of simple equipment and operation, low energy consumption, low pollution, and high recovery. Its application range is very wide, involving all aspects of industrial production and daily life. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/16B01D69/12B01D67/00
Inventor 周文乐宗同强
Owner ETERNAL GUANGDONG TECH ELECTRIC CO LTD
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