A kind of preparation method of high-concentration graphene oxide dispersion liquid

A technology of dispersion liquid and fossil is applied in the field of preparation of high-concentration graphene oxide dispersion liquid, which can solve the problems such as restricting the research on the properties and applications of graphene oxide, unfavorable large-scale purification of graphene oxide, unstable graphene oxide structure, etc. , to achieve the effect of convenient washing process, excellent stability, and low toxicity of purification reagents

Active Publication Date: 2020-08-18
TSINGHUA UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Since graphene oxide will form a viscous slurry in water that is difficult to centrifuge or suction filter, resulting in cumbersome washing process, which is not conducive to the large-scale purification of graphene oxide, so this purification method is not only time-consuming and laborious, but also graphene oxide in water system has structural instability in (ACS Nano 2013,7,576; J.Am.Chem.Soc.2012,134,2815)
Prolonged contact with water during the washing process will cause the reduction of graphene oxide and the fragmentation of the flakes
This will undoubtedly greatly limit the research on the properties and applications of graphene oxide

Method used

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  • A kind of preparation method of high-concentration graphene oxide dispersion liquid
  • A kind of preparation method of high-concentration graphene oxide dispersion liquid
  • A kind of preparation method of high-concentration graphene oxide dispersion liquid

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Embodiment 1

[0032] Embodiment 1, preparation graphene oxide dispersion liquid

[0033] (1) First, apply the Hummers method to oxidize graphite to obtain graphite oxide. The obtained graphite oxide was pre-purified with aqueous hydrochloric acid (the volume ratio of hydrochloric acid to water was 1:10). Then soak the graphite oxide in absolute ethanol for about 4 hours, then centrifuge to remove the ethanol supernatant, soak the precipitate in absolute ethanol again, and repeat this process 3-5 times. Finally, centrifuge to obtain ethanol-purified graphite oxide.

[0034] (2) Dry the graphite oxide purified by ethanol in the air for about 3 hours, then add an organic solvent (propylene carbonate, formic acid, dimethyl sulfoxide or ethylene glycol respectively) and mechanically stir for 15 minutes or gently sonicate (100W) After 10 minutes, an organic solvent dispersion solution of graphene oxide is obtained, wherein the concentration of graphene oxide is 10-40 mg / mL. Pictures of the pre...

Embodiment 2

[0037] Embodiment 2, preparation graphene oxide dispersion liquid

[0038] (1) First, apply the Hummers method to oxidize graphite to obtain graphite oxide. The obtained graphite oxide was pre-purified with aqueous hydrochloric acid (the volume ratio of hydrochloric acid to water was 1:10). Then soak the graphite oxide in absolute ethanol for about 4 hours, then centrifuge to remove the ethanol supernatant, soak the precipitate in ethanol again, and repeat this process 3-5 times. Finally, centrifuge to obtain ethanol-purified graphite oxide.

[0039] (2) Dry the graphite oxide purified by ethanol in the air for about 3 hours, then add water for mechanical stirring for 15 minutes or mild ultrasonic (100W) for 10 minutes to obtain an aqueous solution of graphene oxide, wherein the concentration of graphene oxide is 10 mg / mL.

[0040] Pictures of the prepared dispersions are shown in Figure 4 shown. From Figure 4 It can be seen that graphene oxide can also be well disperse...

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Abstract

The invention discloses a simple preparation method of a high concentration disperse graphene oxide solution. The method comprises the steps of: (1) purifying pickled graphite oxide with an organic solvent; and (2) partially drying the purified graphite oxide to remove the solvent on the surface of the graphite oxide so as to obtain solvated graphite oxide; and (3) putting the solvated graphite oxide in a specific solvent, and conducting stirring or ultrasonic treatment, thus obtaining the graphene oxide solution. Specifically, the organic solvent is a solvent that is mutually soluble with a hydrochloric acid aqueous solution but cannot dissolve graphite oxide; and the specific solvent is selected from a polar solvent. The purifying reagent used in the invention is cheap and has low toxicity, and only has trace residue in the formed graphene oxide solution, and the obtained graphene oxide solution has arbitrarily adjustable concentration, and also has excellent stability. Compared withthe existing methods, the method provided by the invention has the advantages of simple operation, rapidity and high efficiency, and is suitable for industrial application.

Description

technical field [0001] The invention belongs to the field of low-dimensional carbon nanomaterials, and in particular relates to a preparation method of a high-concentration graphene oxide dispersion. [0002] A simple and rapid preparation method for dispersing two-dimensional graphene oxide in a variety of solvents. Background technique [0003] In recent years, low-dimensional carbon nanomaterials have been widely studied due to their excellent physical and chemical properties, and have shown attractive application prospects. Among them, two-dimensional graphene oxide has attracted much research attention due to its outstanding features such as scalable preparation routes and the ability to be easily transformed into graphene-based materials in various forms. The liquid phase dispersion of graphene oxide is the basis for studying its basic properties and preparing various functional materials. Therefore, realizing the excellent dispersion of graphene oxide in solvents is...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/198
CPCC01B2204/02C01B2204/04C01P2004/01C01P2004/04
Inventor 石高全杜文城
Owner TSINGHUA UNIV
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