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Graphene oxide/polyacrylamide composite filtering thin film as well as preparation and application thereof

A technology of polyacrylamide and composite filtration, applied in the direction of membrane technology, semi-permeable membrane separation, chemical instruments and methods, etc., to achieve the effect of wide application and excellent filtration performance

Inactive Publication Date: 2018-08-17
信骅(上海)器材有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] After searching, a nano-sized composite film of graphene oxide and polyacrylamide with filtering function is prepared by using positively charged polyacrylamide as a spacer of graphene oxide sheet, and its preparation method and application have not yet been found. to report

Method used

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  • Graphene oxide/polyacrylamide composite filtering thin film as well as preparation and application thereof
  • Graphene oxide/polyacrylamide composite filtering thin film as well as preparation and application thereof
  • Graphene oxide/polyacrylamide composite filtering thin film as well as preparation and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] (1) Get 50 mg of graphene oxide, dissolve it in 100 ml of distilled water, prepare a graphene oxide aqueous solution with a concentration of 0.5 mg / mL, and disperse it uniformly by ultrasonic;

[0036] (2) Take 5 mg of polyacrylamide with a molecular weight of 1 million, dissolve it in 100 ml of distilled water, prepare a polyacrylamide aqueous solution with a concentration of 0.05 mg / mL, and stir until completely dissolved;

[0037] (3) under stirring conditions, the polyacrylamide aqueous solution of step (2) is added dropwise in the graphene oxide aqueous solution of step (1), stirred for 2 hours and mixed uniformly;

[0038] (4) After mixing evenly, measure 10mL of the graphene oxide / polyacrylamide composite solution sample, use vacuum filtration to form a film, and dry the film naturally to obtain a graphene oxide / polyacrylamide composite film .

[0039] figure 1 Be the SEM of embodiment 1 composite film, from figure 1 (a) It can be seen that polyacrylamide is u...

Embodiment 2

[0043] First, take 25 mg of freeze-dried graphene oxide powder and dissolve it in 100 mL of distilled water, and ultrasonically disperse it to prepare a graphene oxide aqueous solution with a concentration of 0.25 mg / mL; then, transfer the solution to a 100 mL three-necked flask and stir it, Pipette 25 uL of hydrazine hydrate solution with a mass fraction of 35% with a liquid gun, and add it dropwise into a three-necked flask; after stirring evenly, add a solution of ammonia solution with a mass fraction of 28% dropwise to adjust the pH of the reaction system to 10; finally, the reaction system The temperature was raised to 90 °C and reacted at this temperature for 2 hours. Measure 10mL of different solution samples with the same concentration, and use vacuum filtration to form a film. After the film is naturally dried, a graphene oxide filter film, a reduced graphene oxide filter film and a graphene oxide / polypropylene filter film can be obtained. Amide composite filter membr...

Embodiment 3

[0048] (1) Get graphene oxide, be dissolved in distilled water, be mixed with graphene oxide aqueous solution, ultrasonically disperse to uniform;

[0049] (2) Take polyacrylamide, dissolve it in distilled water, prepare polyacrylamide aqueous solution, and stir until completely dissolved;

[0050] (3) under stirring conditions, the polyacrylamide aqueous solution of step (2) is added dropwise in the graphene oxide aqueous solution of step (1), stirred for 2 hours and mixed uniformly;

[0051] (4) After mixing evenly, measure 10mL of the graphene oxide / polyacrylamide composite solution sample, use vacuum filtration to form a film, and dry the film naturally to obtain a graphene oxide / polyacrylamide composite film .

[0052] (5) A reduced graphene oxide solution with a concentration of 0.25 mg / mL and a graphene oxide solution with a concentration of 0.25 mg / mL were prepared again, and an equivalent volume of the solution was vacuum filtered to form a film as a comparison.

[...

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Abstract

The invention discloses a graphene oxide / polyacrylamide composite filtering thin film. The polymer polyacrylamide is used as a spacer between graphene oxide flake layers, and the graphene oxide / polyacrylamide composite filtering thin film with nanometer size and enhanced water flux and filtering property is prepared. The graphene oxide / polyacrylamide composite filtering thin film has the advantages that a graphene oxide flake layer stacking structure is formed, and the surface of each graphene oxide flake layer is uniformly attached with flexible hydrophilic macromolecular polyacrylamide underthe function of electrostatic adsorption; the graphene oxide / polyacrylamide composite filtering thin film is prepared from the following components in percentage by mass: 90+ / -3% of graphene oxide, and 10+ / -3% of polyacrylamide, wherein the molecular weight of the polyacrylamide is 1,000,000 to 3,000,000. Proofed by experiment, the graphene oxide / polyacrylamide composite filtering thin film has the advantages that compared with the graphene oxide thin film, the hydrophilcity is better, and the distance between the flake layers is 0.68nm; the water flux and filtering property are excellent, and the graphene oxide / polyacrylamide composite filtering thin film is expected to be widely applied to preparation of water flux or filtering property equipment.

Description

technical field [0001] The invention belongs to the technical field of inorganic / macromolecular functional materials, and relates to a graphene oxide / polyacrylamide composite filter film with enhanced water flux and filter performance, and its preparation and application. Background technique [0002] Membrane separation technology plays an important role in water treatment, food processing, chemical and pharmaceutical industries. The use of materials with nanopores and nanochannels such as carbon nanotubes, nanoporous graphene, graphene oxide, etc. is an emerging research field with great potential. These materials have attracted great interest among researchers in recent years due to their potential applications in separations. Graphene membranes are very promising in the fields of filtration, separation, seawater desalination, biomimetic selective mass transfer mechanisms, energy storage and conversion, etc. Graphene oxide, as a derivative of graphene, has also received...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/58B01D69/12B01D67/00C02F1/44C02F101/38C02F101/34
CPCB01D67/0079B01D69/12B01D71/58C02F1/44C02F2101/34C02F2101/38
Inventor 黄林军王彦欣程萌萌唐建国王瑶李海东
Owner 信骅(上海)器材有限公司
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