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Method for preparing graphene by using green reducing agent

A technology of graphene and reducing agent, applied in the field of graphene, can solve the problems of sodium borohydride being flammable and explosive, the high price of HI acid, restricting industrial production, etc., and achieve the effect of convenient industrial production, low cost and few steps

Inactive Publication Date: 2016-05-11
宁国市龙晟柔性储能材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Among them, the toxicity of hydrazine hydrate and HI acid, and the flammability and explosion of sodium borohydride lead to certain dangers in the large-scale reduction production process.
Secondly, the high price of HI acid increases the cost of production and restricts industrial production

Method used

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  • Method for preparing graphene by using green reducing agent
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  • Method for preparing graphene by using green reducing agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] (1) Preparation of graphene oxide; the reaction temperature is 0-5°C, add 1g of graphite powder, 0.5g of sodium nitrate and 3g of potassium permanganate in sequence to 23mL of concentrated sulfuric acid, stir the mixed solution magnetically for 0-60min; heat up to 35 ℃, continue to stir for 30min, slowly add 110mL deionized water; heat to 90℃, keep stirring for 30min, then add 18mL hydrogen peroxide, filter while hot; and wash with 5% HCl solution and deionized water until no sulfate is detected in the filtrate Finally, the filter cake is dried;

[0032] (2) Prepare a graphene oxide solution with a volume of 100mL and a mass fraction of 0.2%, and add NH dropwise under magnetic stirring conditions 3 ·H 2 O adjusts the pH value to about 10;

[0033] (3) Weigh 0.02g of L-tyrosine, add it to a 100mL volumetric flask, and prepare an L-tyrosine solution with a concentration of 0.2mg / mL;

[0034] (4) Add the prepared L-tyrosine solution into the mixed solution in step (2), ...

Embodiment 2

[0036] (1) with embodiment 1;

[0037] (2) Prepare a graphene oxide solution with a volume of 100mL and a mass fraction of 0.1%, and add NH dropwise under magnetic stirring conditions 3 ·H 2 O adjusts the pH value to about 10;

[0038] (3) Weigh 0.01g of L-tyrosine, add it into a 100mL volumetric flask, and prepare an L-tyrosine solution with a concentration of 0.1mg / mL;

[0039] (4) Add the prepared L-tyrosine solution into the mixed solution in step (2), and stir magnetically for 8 hours under the condition of a water bath at 95°C. Centrifuge, wash several times with water, and dry.

Embodiment 3

[0041] (1) with embodiment 1;

[0042] (2) Prepare a graphene oxide solution with a volume of 100mL and a mass fraction of 0.05%, and add NH dropwise under magnetic stirring conditions 3 ·H 2 O adjusts the pH value to about 10;

[0043] (3) Weigh 0.01g of L-tyrosine, add it into a 100mL volumetric flask, and prepare an L-tyrosine solution with a concentration of 0.1mg / mL;

[0044] (4) Add the prepared L-tyrosine solution into the mixed solution in step (2), and stir magnetically for 8 hours under the condition of a water bath at 95°C. Centrifuge, wash several times with water, and dry.

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Abstract

The invention discloses a method for preparing graphene by using a green reducing agent, and relates to the technical field of graphene. The method comprises the steps: firstly, preparing graphite oxide by using a Hurmers method, and then stripping by ultrasonic waves to form a graphene oxide solution; then under an alkaline condition, reducing graphene oxide by using L-tyrosine as a reducing agent to obtain reduced graphene; and finally, washing with water, centrifuging and carrying out freeze vacuum drying to obtain a graphene powder. The green environmental-protection reducing agent is used for preparation of graphene. Compared with a traditional reducing agent, the used reducing agent has the advantages of low cost, no toxicity, and green and environmental protection; the prepared graphene has the advantages of larger specific surface area, high-temperature resistance, corrosion resistance, high strength, and good electrical conductivity, can be applied in the fields of smart clothing, lithium ion batteries, super capacitors, anti-corrosion coatings, military aerospace materials and the like.

Description

Technical field: [0001] The invention relates to the technical field of graphene, in particular to a method for preparing graphene using a green reducing agent. Background technique: [0002] Graphene is a special carbon atom with SP 2 A carbonaceous material with a single-layer two-dimensional honeycomb structure densely packed in the form of hybridization, due to its excellent properties such as high specific surface area, hydrophilic and hydrophobic surface, outstanding thermal conductivity and mechanical properties, and extraordinary electron transfer performance. , has attracted great attention in the fields of water treatment, high-performance energy storage devices, sensors, composite materials, and sterilization in recent years. [0003] At present, the methods for preparing graphene include: mechanical exfoliation method, epitaxial growth method, chemical vapor deposition method and graphite oxide reduction method, etc. The mechanical exfoliation method has a rela...

Claims

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Application Information

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IPC IPC(8): C01B31/04
CPCC01B2204/22C01P2002/82C01P2002/84C01P2004/04
Inventor 刘连梅王斌苑玥袁璐
Owner 宁国市龙晟柔性储能材料科技有限公司
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