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Graphene ultrafiltration membrane and preparation method thereof

A graphene, ultrafiltration membrane technology, applied in ultrafiltration, chemical instruments and methods, membrane technology, etc., can solve the problems of low separation efficiency, high energy consumption, poor stability, etc., to enhance the interlayer force and improve stability. the effect of overcoming poor stability

Active Publication Date: 2019-01-29
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the pure graphene oxide membrane has the disadvantages of low separation efficiency, high energy consumption and poor stability, which limit its application.

Method used

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  • Graphene ultrafiltration membrane and preparation method thereof
  • Graphene ultrafiltration membrane and preparation method thereof
  • Graphene ultrafiltration membrane and preparation method thereof

Examples

Experimental program
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Effect test

example 1

[0026] A kind of preparation method of graphene ultrafiltration membrane is as follows:

[0027] (1) Prepare 50 ml of graphene oxide aqueous solution with a concentration of 0.1 mg / L for ultrasonic dispersion, add 50 ul of hydrazine hydrate with a mass fraction of 50 wt % and 100 ul of ammonia with a mass fraction of 28 wt %, stir vigorously and mix uniformly, Under reaction for 4 hours, obtain partly reduced graphene oxide solution;

[0028] (2) Dissolve 0.108g of cadmium nitrate tetrahydrate in 20ml of aqueous solution, dissolve 0.0736g of hexamethylenetetramine in 15ml of aqueous solution, mix the two evenly, put them in a 50ml high-temperature reactor, and react at 105°C for 35h, The product was washed twice with water and ethanol and dried at room temperature for 24 hours to obtain cadmium hydroxide nanowires;

[0029] (3) Disperse 0.0025g of cadmium hydroxide nanowires in 50ml of aqueous solution, take 10ml of cadmium hydroxide nanowire dispersion and 1ml of the partial...

example 2

[0035] A kind of preparation method of graphene ultrafiltration membrane is as follows:

[0036] (1) Prepare 50 ml of graphene oxide aqueous solution with a concentration of 5 mg / L and ultrasonically disperse it uniformly, add 80 ul of hydrazine hydrate with a mass fraction of 50 wt % and 150 ul of ammonia with a mass fraction of 28 wt %, stir vigorously and mix evenly, at a temperature of 40 ° C React for 3 hours to obtain partially reduced graphene oxide.

[0037] (2) Dissolve 1.08g of cadmium nitrate tetrahydrate in 20ml of aqueous solution, dissolve 0.9813g of hexamethylenetetramine in 15ml of aqueous solution, mix the two evenly, put them in a 50ml high-temperature reaction kettle, and react at 100°C for 48h, The product was washed twice with water and ethanol and dried at room temperature for 24 hours to obtain cadmium hydroxide nanowires.

[0038] (3) Disperse 0.001g of cadmium hydroxide nanowires in 50ml of aqueous solution, get 5ml of cadmium hydroxide nanowire dispe...

example 3

[0041] A kind of preparation method of graphene ultrafiltration membrane is as follows:

[0042] (1) Prepare 50ml of graphene oxide aqueous solution with a concentration of 10mg / L and ultrasonically disperse it uniformly, add 120ul of hydrazine hydrate with a mass fraction of 50wt% and 200ul of ammonia with a mass fraction of 28wt%, stir vigorously and mix evenly, and heat the mixture at a temperature of 60°C React for 2 hours to obtain partially reduced graphene oxide.

[0043] (2) Dissolve 2.1593g of cadmium nitrate tetrahydrate in 20ml of aqueous solution, dissolve 0.0491g of hexamethylenetetramine in 15ml of aqueous solution, mix the two evenly, put them in a 50ml high-temperature reaction kettle, and react at 180°C for 8h, The product was washed twice with water and ethanol and dried at room temperature for 24 hours to obtain cadmium hydroxide nanowires.

[0044] (3) Disperse 0.0005g of cadmium hydroxide nanowires in 50ml of aqueous solution, take 5ml of cadmium hydroxid...

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Abstract

The invention provides a graphene ultrafiltration membrane and a preparation method thereof. The method comprises the following steps: subjecting graphene oxide to ultrasonic dispersion in water so asto obtain a graphene oxide dispersion, then adding 50 wt% hydrazine hydrate and 28 wt% of ammonia water into the graphene oxide dispersion, and carrying out a reaction so as to obtain a partially-reduced graphene oxide solution; placing a cadmium nitrate tetrahydrate aqueous solution and a hexamethylenetetramine aqueous solution into a high-temperature reaction vessel, and carrying out a reactionso as to obtain cadmium hydroxide nanowires; and dispersing the obtained cadmium hydroxide nanowires into water so as to obtain a cadmium hydroxide nanowire solution, uniformly mixing the cadmium hydroxide nanowire solution with the partially-reduced graphene oxide solution so as to obtain a reaction mixed solution B, and subjecting the reaction mixed solution B to vacuum filtration on a polymerporous microfiltration membrane so as to obtain the graphene ultrafiltration membrane. The graphene ultrafiltration membrane prepared by using the preparation method provided by the invention has thefollowing advantages: a linear water flowing channel is formed between membrane layers, so the interception rate of the graphene ultrafiltration membrane is increased; organic pollutants can be effectively intercepted; and high water flux is achieved.

Description

(1) Technical field [0001] The invention relates to a graphene ultrafiltration membrane and a preparation method thereof. (2) Technical background [0002] Graphene oxide has a layered structure very similar to graphene, and its surface is rich in active groups such as hydroxyl, epoxy, and carboxyl. The large specific surface area and layered structure of graphene oxide determine the large ion exchange capacity of graphene oxide, and the rich oxygen-containing groups on the surface of the layered structure determine that graphene oxide can be uniformly dispersed in water, hydrophilic molecules and polymers etc. can be intercalated into graphene oxide layers to form interlayer compounds through interlayer hydrogen bonds, ionic bonds, and covalent bonds, making them have great potential and application prospects in the field of separation materials. However, the pure graphene oxide membrane has the disadvantages of low separation efficiency, high energy consumption and poor s...

Claims

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Application Information

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IPC IPC(8): B01D61/14B01D71/02B01D69/10B01D67/00
CPCB01D61/145B01D67/0039B01D69/10B01D71/021
Inventor 张国亮徐泽海周敏张宇藩
Owner ZHEJIANG UNIV OF TECH
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