Environment-friendly method for preparing water-soluble grapheme at normal temperature

A water-soluble, alkene-green technology, applied in graphene, nano-carbon and other directions, can solve the problems of inability to mass-produce graphene dispersibility and water-solubility, high reaction temperature, environmental hazards, etc., and achieve good water solubility and stable dispersion. the effect of reducing production costs

Inactive Publication Date: 2012-09-19
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0014] The present invention aims to solve the problems of high reaction temperature, toxicity in the reaction process, environmental hazards, incapability of large-scale production and poor dispersibility and water solubility of existing graphene in the existing method for preparing graphene, and provides a water Green preparation method of soluble graphene

Method used

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  • Environment-friendly method for preparing water-soluble grapheme at normal temperature
  • Environment-friendly method for preparing water-soluble grapheme at normal temperature
  • Environment-friendly method for preparing water-soluble grapheme at normal temperature

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specific Embodiment approach 1

[0036] Specific embodiment one: the green preparation method of water-soluble graphene at normal temperature in this embodiment is carried out according to the following steps:

[0037]One, take by weighing graphite powder, concentrated sulfuric acid, sodium nitrate, potassium permanganate, deionized water; Wherein the ratio of graphite powder and the vitriol oil is 1g: (20~80mL); The ratio of graphite powder and sodium nitrate is 1g: ( 0.5~2.0g); The ratio of graphite powder and potassium permanganate is 1g: (3~10g); The ratio of graphite powder and deionized water is 1g: (100~200mL); The mass fraction of concentrated sulfuric acid is 98%;

[0038] 2. Place the dry beaker in an ice bath, add the graphite powder, concentrated sulfuric acid and sodium nitrate weighed in step 1 to the beaker, stir and mix evenly, then add potassium permanganate, and control the reaction temperature not to exceed 10°C. Continue magnetic stirring for 2 to 3 hours to complete the exfoliation of gr...

specific Embodiment approach 2

[0046] Specific embodiment two: this embodiment is different from specific embodiment one: the ratio of graphite powder and the vitriol oil in step 1 is 1g: (40~70mL); The ratio of graphite powder and sodium nitrate is 1g: (1.0~1.5 g); the ratio of graphite powder to potassium permanganate is 1g: (5-8g); the ratio of graphite powder to deionized water is 1g: (120-180mL). Others are the same as in the first embodiment.

specific Embodiment approach 3

[0047] Embodiment 3: The difference between this embodiment and Embodiment 1 or 2 is that the reaction temperature in step 2 is 5-8°C. Others are the same as in the first or second embodiment.

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Abstract

The invention relates to a method for preparing water-soluble grapheme at the normal temperature, which relates to a grapheme preparation method. The method for preparing water-soluble grapheme at the normal temperature aims to overcome the defects that the traditional method for preparing grapheme has the disadvantages of high reaction temperature, is poisonous in the reaction process, is harmful to the environment and is not suitable for large-scale production, and also solve the problems of the dispersibility and the water solubility of the traditional grapheme. The method comprises the following steps: taking graphite powder, concentrated sulfuric acid, sodium nitrate, potassium permanganate and deionized water as raw materials to prepare graphene oxide; adding the graphene oxide into sodium hydroxide solution; processing the sodium hydroxide solution added with the graphene oxide through ultrasonic under the vacuum condition; then stirring the sodium hydroxide solution added with the graphene oxide with magnetic force for 24-60 hours; and drying sedimentary resultants in a vacuum drying chamber so as to obtain the water-soluble grapheme after the resultants are washed and filtered. The method disclosed by the invention has the advantages of low process cost, environmental protection and no pollution, and can be used for large-scale protection. The solubility of the prepared grapheme is 1.5-2.0mg/ml, and the prepared grapheme can be stably dispersed in the water without generating sediments within 4-6 months. The graphene prepared with the method disclosed by the invention can be used in the fields of biological medicine, energy, electron and the like.

Description

technical field [0001] The invention relates to a preparation method of graphene. Background technique [0002] Since Professor Andre Geim and Kostya Novoselov of the University of Manchester in the United Kingdom first obtained graphene (Graphene, GN) by tape stripping in 2004, the research on graphene has attracted extensive attention of scientific researchers. In 2010, two British chemists won the Nobel Prize in Physics, and graphene became another major discovery after fullerene and carbon nanotubes (Science, 2004, 306, 666-669). Graphene is a two-dimensional carbon material composed of six-membered rings. Each carbon atom is sp2 hybridized, and the remaining electron in the p orbital forms a large conjugated system and a large π orbital, and electrons can move freely in the π orbital (Angew.Chem., Int.Ed., 2009, 48 , 7752-7777). Graphene has good electrical conductivity, mechanical strength, catalytic performance, optical performance, and adsorption performance. In a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/04C01B32/184
Inventor 李欣范秀娟
Owner HARBIN INST OF TECH
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