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Controllable-interlamellar-spacing stable graphene oxide film and preparation method thereof

A graphene film and graphene technology are applied in the field of stable graphene oxide film and its preparation, which can solve the problems of graphene oxide stacked lamella structure damage, poor selectivity of graphene oxide film and the like, and achieve high stability, Reduced layer spacing, reduced hydration effect

Active Publication Date: 2015-11-25
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the incorporation of molecules, especially the incorporation of polymers, will destroy the original stacked sheet structure of graphene oxide, resulting in poor selectivity of graphene oxide membranes.

Method used

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  • Controllable-interlamellar-spacing stable graphene oxide film and preparation method thereof
  • Controllable-interlamellar-spacing stable graphene oxide film and preparation method thereof
  • Controllable-interlamellar-spacing stable graphene oxide film and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0046] In this embodiment, the preparation method of a stable graphene oxide film with controllable layer spacing is as follows:

[0047] (1) Prepare graphene oxide by improving the hummer method

[0048] ①Put 3g of graphite flakes, 12mL of concentrated sulfuric acid, 2.5g of potassium persulfate, and 2.5g of phosphorus pentoxide into a single-necked flask, react at 80°C for 4.5h under stirring conditions, cool the resulting reaction solution to room temperature, and add 500mL Deionized water, stirred overnight, then filtered, rinsed the filter cake with 1500mL deionized water, and aired at room temperature for 24 hours to remove the moisture in the filter cake, which completed the pretreatment of graphite;

[0049] ②Put 120mL of concentrated sulfuric acid at 0°C into the conical flask, then add the graphite pretreated in step ①, and then add 15g of potassium permanganate, and control the addition speed of potassium permanganate as slow as possible so that the conical flask T...

Embodiment 2

[0060] In the present embodiment, the preparation method of the highly stable graphene oxide film with controllable interlayer distance is basically the same as the operation of embodiment 1, the only difference is that in step (3), the graphene oxide aqueous solution obtained in step (1) is taken 100 mL was mixed with 100 mL of the partially reduced graphene oxide aqueous solution obtained in step (2), and treated with 100 W ultrasonic for 0.5 h to form a casting solution. The interlayer spacing of the graphene oxide film prepared in this example is 0.84 nm.

Embodiment 3

[0062] In the present embodiment, the preparation method of the stable graphene oxide film with controllable interlayer spacing is basically the same as the operation of embodiment 1, the only difference is: in step (3), take 40 mL of the graphene oxide aqueous solution obtained in step (1) and 160 mL of the partially reduced graphene oxide aqueous solution obtained in step (2) was mixed, and treated with 100 W ultrasonic for 0.5 h to form a casting solution. The interlayer spacing of the graphene oxide film prepared in this example is 0.80 nm.

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Abstract

The invention belongs to the field of graphene oxide films, and provides a controllable-interlamellar-spacing stable graphene oxide film which is prepared by accumulating partially reduced graphene oxide lamellae layer by layer or accumulating lamellae composed of graphene oxide and partially reduced graphene oxide layer by layer. The preparation method comprises the following steps: (1) uniformly dispersing the partially reduced graphene oxide in water, or uniformly dispersing the graphene oxide and partially reduced graphene oxide in water to form a film casting solution; and (2) filtering the film casting solution through a substrate film to form a wet-state graphene oxide film on the substrate film, putting the wet-state graphene oxide film together with the substrate film in a drying plant, drying, and peeling the graphene oxide film off the substrate film. The method can enhance the stability of the graphene oxide film in the water, acid solution or alkali solution on the premise of not blocking the interlamellar transmission channels of the graphene oxide film or destroying the accumulated lamellar structure.

Description

technical field [0001] The invention belongs to the field of graphene oxide films, in particular to a stable graphene oxide film with controllable layer spacing and a preparation method thereof. Background technique [0002] Graphene oxide membrane has very high material selectivity and transport permeability. There are oxidized and non-oxidized regions on the two-dimensional graphene oxide sheet. When the graphene oxide film is constructed layer by layer, the hydroxyl and epoxy groups on the sheet form a channel with a height of about 0.9nm. This structure determines Selectivity of graphene oxide membranes. The non-oxidized area on the surface of the graphene oxide sheet can enable substances such as water molecules to slide quickly without friction in the channel, so the permeability of the substance across the membrane is very high. Excellent selectivity and transport permeability make graphene oxide membranes have important application value in seawater desalination, i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/04
Inventor 刘壮奚月恒胡嘉麒褚良银谢锐巨晓洁汪伟
Owner SICHUAN UNIV
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