Method for reducing graphene oxide

A graphene and solution technology, applied in the field of reducing graphene oxide, can solve problems such as irreversible agglomeration, and achieve the effect of simple preparation method, green reduction degree, and promotion of reduction

Inactive Publication Date: 2014-04-23
HUNAN UNIV
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  • Abstract
  • Description
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Problems solved by technology

[0003] Aiming at the above-mentioned problems existing in the prior art, the present invention proposes a method for reducing graphene oxide, while overcoming the destructive effect of ultraviolet high-energy rays on the graphene structure, it solves the problem that graphene is prone to occur in solution in the prior art. The problem of irreversible reunion

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Examples

Experimental program
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Embodiment 1

[0031] Specifically include the following steps:

[0032] (1) Preparation of graphite oxide powder: Mix 3g of graphite, 18g of potassium permanganate, 360mL of concentrated sulfuric acid, and 40mL of phosphoric acid, stir magnetically in a water bath at 50°C for 12 hours, then pour 6mL of 30Wt% H2O2 and 200mL of ice cubes into a beaker , pour the reaction solution on ice cubes, centrifuge, pour off the supernatant, wash with 30% HCl, centrifuge for 1h, and wash twice with ethanol and deionized water in the same way. Freeze-dry to obtain graphite oxide powder.

[0033] (2) Prepare 1 L of 100 mg / L fulvic acid aqueous solution.

[0034] (3) Weigh 500 mg of graphite oxide and add it to the fulvic acid solution, ultrasonically disperse for 30 minutes to obtain a uniformly dispersed mixed solution, in which the concentration of fulvic acid is 100 mg / L, and the concentration of graphene oxide is 500 mg / L.

[0035] (4) Protect from light, and evenly expose nitrogen to the mixed solu...

Embodiment 2

[0041] Specifically include the following steps:

[0042] (1) The preparation process is the same as in Example 1 to obtain graphite oxide powder.

[0043] (2) Prepare 1 L of ethanol solution of 100 mg / L humic acid.

[0044] (3) Weigh 500 mg of graphite oxide and add it to the humic acid ethanol solution, and disperse it by ultrasonic for 30 minutes to obtain a uniformly dispersed mixed solution, in which the concentration of humic acid is 100 mg / L, and the concentration of graphene oxide is 500 mg / L.

[0045] (4) Protect from light, and evenly expose nitrogen to the mixed solution for 30 minutes.

[0046] (5) Turn on the simulated sunlight light source, irradiate, and control the temperature at room temperature until the color of the reaction solution remains basically unchanged.

[0047] After the reaction, the originally yellow graphite oxide mixed solution turned into a black mixed solution, and the solution did not agglomerate after the reaction.

[0048] (6) Centrifug...

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Abstract

The invention discloses a method for reducing graphene oxide. According to the method for reducing graphene oxide, natural organic matter humus is ingeniously used to reduce graphene oxide. The method for reducing graphene oxide is mild in reaction conditions and low in energy consumption, is capable of avoiding destructive effect on graphene structure because of high temperature or high-energy UV ray in the prior art; and also the added natural organic matter humus has no environmental toxic and side effects and has the capabilities of promoting graphene dispersion and protecting graphene structure. The preparation method provided by the invention has the characteristics of being simple, green, environment-friendly, controllable in reduction degree and the like. The method relatively well makes up the disadvantages of conventional methods for reducing graphene oxide, provides reference for chemical industrial production of graphene materials, and has great potential application value in the fields of photoelectric materials such as graphene and the like.

Description

technical field [0001] The invention belongs to the field of inorganic chemistry, and in particular relates to a method for reducing graphene oxide. Background technique [0002] At present, the methods for preparing graphene from graphite mainly include micromechanical exfoliation method, epitaxial growth method, chemical vapor deposition method, chemical redox method and so on. The chemical redox method is widely used in the preparation of graphene materials due to its low cost, simple operation and large-scale production. The oxidation process can prepare a stable graphene suspension, which solves the problem that graphene is not easy to disperse. . The chemical redox method is to oxidize graphite to graphite oxide by oxidation reaction, and then form graphene oxide by ultrasonic exfoliation, and then add a reducing agent for reduction. Commonly used reducing agents are hydrazine hydrate, NaBH 4 / Hydroquinone etc. However, the graphene obtained by reduction with chem...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/04C01B32/184
Inventor 刘承斌罗胜联王龙禄刘玉堂王博谷张书渠
Owner HUNAN UNIV
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