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A kind of method that metal/tea polyphenol is used as reducing agent to reduce graphene oxide

A technology of tea polyphenol and reducing agent, applied in the field of reducing graphene oxide with metal/tea polyphenol as reducing agent, can solve the problems of complex process, high toxicity of reducing agent, long preparation period, etc. Good, non-toxic effect

Active Publication Date: 2016-06-22
SOUTH CHINA UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The present invention aims to solve the problems of high toxicity of the reducing agent, long preparation period and complicated process, and provides a method for reducing graphene oxide with metal / tea polyphenol as the reducing agent. The preparation process of the present invention is simple and has no special requirements for equipment, and Has a good restoration effect

Method used

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  • A kind of method that metal/tea polyphenol is used as reducing agent to reduce graphene oxide
  • A kind of method that metal/tea polyphenol is used as reducing agent to reduce graphene oxide
  • A kind of method that metal/tea polyphenol is used as reducing agent to reduce graphene oxide

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Embodiment 1

[0022] Graphite oxide was prepared by the Hummers method, and 230ml of concentrated sulfuric acid with a mass fraction of 98% was slowly added to a 1000ml three-neck flask, and 10g of original graphite and 5gNaNO 3 Slowly add concentrated sulfuric acid, stir at a low temperature of 5°C to ensure thorough mixing, and slowly add 30g KMnO in batches after 30 minutes 4 , reacted for 2 hours; then moved the three-necked flask into a 35°C water bath for medium-temperature reaction, and continued to stir for 30 minutes; slowly added 460ml of deionized water to the three-necked flask for dilution, and then moved the three-necked flask into a 95°C water bath for high-temperature reaction, and continued to stir for 30 minutes ; the reaction ends, the mixture is moved into the beaker and continues to add deionized water for dilution, adding 25ml mass fraction is 30% H 2 o 2 Solution, after washing several times with deionized water, add a little HCl solution with a mass fraction of 36.5...

Embodiment 2

[0025] Adopt the method for embodiment 1 to prepare 100ml concentration and be the graphene oxide dispersion liquid of 3mg / ml, add this solution into 250ml there-necked flask, then add 0.3g tea polyphenols and 1.2g aluminum sheet to the there-necked flask, the size of aluminum sheet is 0.5cm ×0.5cm×1mm, that is, the mass ratio of graphene oxide to tea polyphenols and aluminum is 1:1:4, put the three-neck flask in a water bath at 80°C for 2 hours; after the reaction is completed, the product is centrifugally washed and removed from the dispersion For excess tea polyphenols, remove the precipitate and place it in an oven at 105°C to dry to obtain graphene.

[0026] figure 2 Curve c in middle shows the XRD spectrum of graphene. After the reduction of tea polyphenols / aluminum flakes, the interlayer spacing of graphene is reduced from 0.834nm to 0.353nm, which is close to the original graphite interlayer spacing, indicating the removal of oxygen-containing groups. This proves the...

Embodiment 3

[0029] Adopt the method for embodiment 2 to prepare graphene, the difference is that the quality of aluminum sheet is changed from 1.2g to 0.3g, that is, the mass ratio of graphene oxide, tea polyphenols and aluminum is 1:1:1; As shown in Table 1, the square resistance of the graphene film has reached 279.67Ω / sq, which is 30.2% lower than that of Comparative Example 1, indicating that the addition of reducing aluminum flakes in the reducing system can improve the conductivity of graphene.

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Abstract

The invention discloses a method for reducing graphene oxide with metal / tea polyphenol as a reducing agent, comprising the following steps: preparing graphite oxide by the Hummers method, placing the graphite oxide in water and dispersing the graphite oxide film and water evenly through ultrasonic dispersion, A brownish-brown graphene oxide dispersion is obtained; tea polyphenols and metals are used as reducing agents, and the reducing agent is added to the graphene oxide dispersion for reduction reaction to obtain a stable graphene dispersion, and the product is centrifugally washed and dried to obtain graphite alkene. The invention has the advantages that the reducing agent is green and pollution-free, has a wide range of sources, the preparation process is simple, safe and fast, and has a good reduction effect on graphene oxide, and the prepared graphene has good conductivity, is easy to popularize and use, and has Broader application prospects.

Description

technical field [0001] The invention relates to a method for preparing graphene, in particular to a method in which metal / tea polyphenols are used as a reducing agent to reduce graphene oxide. Background technique [0002] Graphene refers to a single-layer graphite sheet, which is a single-atom-layer two-dimensional crystal material with a honeycomb structure formed by sp2 hybridization of carbon atoms. Due to its thermal conductivity, high optical transparency, electrical conductivity, mechanical properties, and high specific surface area In the past few years, graphene has received extensive attention from researchers around the world, and it is also known as one of the most amazing materials in the 21st century; since it was first discovered by Novoselov and Geim in 2004 through micromechanical exfoliation Since graphene, various methods such as chemical vapor deposition, epitaxial growth, cutting carbon nanotubes, liquid phase exfoliation and reduced graphene oxide have ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B31/04
Inventor 张宏伟南松楠
Owner SOUTH CHINA UNIV OF TECH
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