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High stability seawater desalination membrane and its preparation method and application

A seawater and composite membrane technology, applied in seawater treatment, chemical instruments and methods, membrane technology, etc., can solve the problems of inorganic membrane materials such as high brittleness, poor stability, difficulty in processing and molding, and equipment components

Active Publication Date: 2019-11-29
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although inorganic membranes can effectively overcome the shortcomings of organic membranes, inorganic membrane materials are brittle and have low elasticity, making it difficult to process and equip components
[0004] To sum up, it has been reported in the prior art to form a film layer on some special materials for seawater desalination, but the formed film has poor stability in seawater environment

Method used

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  • High stability seawater desalination membrane and its preparation method and application
  • High stability seawater desalination membrane and its preparation method and application
  • High stability seawater desalination membrane and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0086] Preparation of composite membrane

[0087] (1) Support modification to enhance the adhesion between the support and graphene oxide

[0088] Immerse the porous carrier (such as porous alumina carrier) in the mixed solution that dissolves modifier (such as dopamine hydrochloride) solution, and treat it for a period of time (such as 0.5-100 hours at a certain temperature (such as 20-40 ° C), relatively Preferably 10-72 hours, more preferably 20-48 hours), thereby introducing -NH on the surface of the substrate 2 , -OH and other organic functional groups to enhance the adhesion of porous supports.

[0089] (2) Preparation of graphene oxide film

[0090] Dissolve the graphene oxide slurry in water to make a graphene oxide suspension with a certain concentration (such as 0.01-5mg / mL, preferably 0.05-1mg / mL, more preferably 0.10-0.5mg / mL), and ultrasonically disperse , fix the PDA-modified substrate carrier in the vacuum filtration device assembly, turn on the vacuum pump, ...

Embodiment 1

[0107] Embodiment 1: Preparation of graphene oxide film

[0108] (1) PDA functional modification of porous sheet-like alumina substrate

[0109] Put the porous alumina sheet-like carrier (2.5cm×2.5cm) into a mixed solution of 0.3g dopamine hydrochloride (modifier) ​​and 60g deionized water (wherein, 0.6g Tris (Hydroxymethyl)aminomethane, so as to adjust the pH to about 8.4-8.6), and treat it at 25°C for 24h, so as to introduce -NH on the surface of the substrate 2 , -OH and other organic functional groups enhance the bioadhesion performance of the carrier.

[0110] (2) Preparation of graphene oxide film by vacuum filtration

[0111] Dissolve 2.5wt% GO slurry in water to form a 1.0mg / mL graphene oxide suspension and disperse it ultrasonically, fix the PDA-modified alumina flake carrier in the vacuum device assembly, turn on the vacuum pump, and take 2mL graphite oxide Graphene suspension is dropped on the front surface of the alumina flake carrier. Under the action of vacuum...

Embodiment 2

[0112] Embodiment 2: prepare graphene oxide film

[0113] (1) PDA functional modification of porous sheet-like alumina substrate

[0114] Put the porous alumina flake carrier into a mixed solution dissolved with 0.3g of dopamine hydrochloride, 0.6g of tris(hydroxymethyl)aminomethane and 60g of deionized water, and treat it at 25°C for 48h to introduce -NH 2 , -OH and other organic functional groups enhance the bioadhesion performance of the carrier.

[0115] (2) Preparation of graphene oxide film by vacuum filtration

[0116] With embodiment 1.

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Abstract

The invention relates to a high stability seawater desalination film, a preparation method and application thereof, in particular relates to a uniform and compact graphene oxide film characterized by high stability and high desalination performance and prepared through a process of modifying a solid phase carrier by dopamine, and also provides a preparation method of the graphene oxide film and application of the film in seawater desalination.

Description

technical field [0001] The present invention relates to a high-stability seawater desalination membrane and its preparation method and application, in particular to a graphene oxide membrane which is uniform and compact, has high stability and high seawater desalination performance, and is prepared by modifying a solid-phase carrier with dopamine. And provide a preparation method of the graphene oxide film and its application in seawater desalination. Background technique [0002] Water is one of the necessary substances for human beings and creatures to survive. However, with the development of modern industrial construction in recent years, the degree of water pollution has become increasingly serious, and cities in western my country and many remote areas are facing a crisis of water shortage. Faced with such a severe water shortage situation, my country has adopted a series of mitigation measures, such as increasing income and reducing expenditure, scientific irrigation,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D69/12B01D71/02B01D67/00C02F1/44C02F103/08
CPCB01D67/0039B01D69/12B01D71/021C02F1/44C02F2103/08Y02A20/131
Inventor 黄爱生徐凯刘倩
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI