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Defect-rich water-stable graphene oxide film as well as preparation method and application thereof

A graphene membrane and water stabilization technology, applied in chemical instruments and methods, membrane technology, water pollutants, etc., can solve the problems of complex operation of chemical reagents, shortening the transmission path of water molecules, and difficulty in ensuring membrane stability. Good removal effect, optimized osmotic separation efficiency, and the effect of facilitating large-scale production

Active Publication Date: 2021-10-29
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the above methods can etch pinholes on the surface of GO sheets and shorten the transport path of water molecules in the membrane, these hole-cutting methods usually require complex operations and the use of a large number of chemical reagents
In addition, most defect regulation methods do not introduce cross-linking agents into the membrane, which will lead to a lack of sufficient connection force between the sheets, and it is difficult to ensure the stability of the membrane for long-term operation.

Method used

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  • Defect-rich water-stable graphene oxide film as well as preparation method and application thereof
  • Defect-rich water-stable graphene oxide film as well as preparation method and application thereof
  • Defect-rich water-stable graphene oxide film as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] (1) Preparation of graphene oxide solution

[0050] First, 1 g of NaNO was placed in an ice bath at 5°C 3 and 50 mL of concentrated H with a mass fraction of 98% 2 SO 4 Mix it into a beaker, mix it in an ice bath at 5 °C, add 2 g of natural flake graphite (325 mesh), stir for 1 h for pre-oxidation, and then add 6 g of KMnO 4 Add it slowly (add in batches within 1h, stir while adding), and then stir magnetically for 10min after the addition (in an ice bath, the temperature is less than 20°C), then raise the temperature to 35°C for another 2h, and then mix Slowly add 90mL of ultrapure water to the system. After adding water, the temperature of the system will rise rapidly. Use the released heat to continue the reaction until the temperature stops rising and begins to drop (the reaction is over at this time). After stirring for 15 minutes, add about 300mL of ultrapure water to stop. reaction, and finally adding a concentration of 30% H 2 o 2 , H 2 o 2 The amount of ...

Embodiment 2

[0056] Same as Example 1, the only difference is that H 2 o 2 and Fe 2+ H in the mixed solution 2 o 2 The concentration was 0.05mmol / L, and a graphene oxide film (Fe / GO-0.05) was obtained.

Embodiment 3

[0058] (1) Preparation of graphene oxide solution

[0059] First, 0.5 g NaNO 3 and 25 mL of concentrated H with a mass fraction of 98% 2 SO 4 Mix it into a beaker, mix it in an ice bath at 5°C, then add 1g of natural flake graphite (325 mesh), stir for 1h for pre-oxidation, and then add 3gKMnO 4 Add it slowly (add in batches within 1h, stir while adding), and then stir magnetically for 10min after the addition (in an ice bath, the temperature is less than 20°C), then raise the temperature to 35°C for another 2h, and then mix Slowly add 45mL of ultrapure water to the system. After adding water, the temperature of the system will rise rapidly. Use the released heat to continue the reaction until the temperature stops rising and begins to drop (the reaction ends at this time). After stirring for 15 minutes, add about 300mL of ultrapure water to stop. reaction, and finally adding a concentration of 30% H2 o 2 , H 2 o 2 The dosage should be determined until the solution turns...

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Abstract

The invention discloses a defect-rich water-stable graphene oxide film as well as a preparation method and application thereof, and belongs to the technical field of environment-friendly water treatment. The graphene oxide film is obtained by dispersing and diluting graphene oxide powder with water to obtain a graphene oxide diluent, adding a mixed solution of H2O2 and Fe < 2 + >, loading the graphene oxide diluent to a mixed cellulose ester microfiltration film through suction filtration, and cleaning the mixed cellulose ester microfiltration film. The graphene oxide film is crosslinked by adopting a cheap and green Fe < 2 + > and H2O2 system, and defects of the structure of the graphene oxide film are regulated and controlled, so that the permeability of the film is enhanced on the basis of improving the stability of the graphene oxide film, and meanwhile, the film has a good removal effect on medium molecular weight and macromolecular pollutants in water.

Description

technical field [0001] The invention relates to the technical field of environmental protection water treatment, in particular to a defect-rich water-stable graphene oxide film and its preparation method and application. Background technique [0002] Graphene oxide (GO) membrane is a new type of two-dimensional membrane assembled from atomically thick GO sheets, which is widely used in water treatment process. The use of nanochannels constructed between adjacent GO sheets can allow Water molecules pass quickly while intercepting substances in the water whose size is larger than the channel size. However, GO membranes have certain instability in the hydrated state, which has become a major obstacle restricting the practical application of GO membranes. In addition, it is still an important challenge for GO membrane research to regulate the microstructure of GO membranes at the sub-nanometer scale and break the "tradeoff effect" between membrane flux and rejection. [0003] ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D67/00B01D69/12B01D71/02B01D71/12C02F1/44C02F101/30
CPCB01D67/0039B01D67/0076B01D69/12B01D71/021B01D71/12C02F1/44C02F2101/30C02F2101/308
Inventor 刘婷田隆孙克宁
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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