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Green preparation method of graphene based on tea polyphenol/green tea juice

A technology of tea polyphenols and green tea juice, which is applied in the field of graphene preparation based on tea polyphenols/green tea juice as a reducing agent, can solve the problems of harsh experimental conditions, graphene agglomeration, environmental pollution, etc., and achieve good biocompatibility, Good dispersibility and simple process

Inactive Publication Date: 2010-11-03
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the above-mentioned technical defects such as high production cost, unsuitability for large-scale production, harsh experimental conditions, and environmental pollution and health hazards caused by harmful reagents in the above-mentioned graphene preparation process, and effectively solve the problem of using chemical exfoliation to prepare graphene. Agglomeration problem of olefin, the present invention proposes a kind of graphene preparation method based on tea polyphenol / green tea juice, this method is raw material with graphite oxide solution, adopts tea polyphenol / green tea juice as reducing agent, without adding any stabilizer / In the case of a dispersant, a graphene aqueous solution with good dispersibility and stability is prepared

Method used

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  • Green preparation method of graphene based on tea polyphenol/green tea juice

Examples

Experimental program
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Effect test

Embodiment 1

[0020] a) Add 2.5g of potassium persulfate and 2.5g of phosphorus pentoxide to 12mL of hot concentrated sulfuric acid at 90°C, mix and stir until the solid is completely dissolved, cool the mixture to 80±1°C, add 3g of graphite powder, and mix well. React in a water bath at 80±1°C for 4.5 hours; cool the mixture to room temperature, dilute it with 0.5L double-distilled water and let it stand overnight, then filter and separate it with a 0.22 micron-pore cellulose acetate filter, and wash it with a large amount of double-distilled water , the filter cake was naturally dried at room temperature; the above product, namely pre-oxidized graphite, was added to 120 mL of ice-bathed concentrated sulfuric acid under stirring conditions, and 15 g of potassium permanganate was slowly added while stirring, and the mixture was stirred and reacted for 0.5 hours under ice-bath conditions. ;The temperature of the water bath was raised to 35±1°C and the reaction was stirred for 2 hours; while s...

Embodiment 2

[0025] a) Add 2.5g of potassium persulfate and 2.5g of phosphorus pentoxide to 12mL of hot concentrated sulfuric acid at 90°C, mix and stir until the solid is completely dissolved, cool the mixture to 80±1°C, add 3g of graphite powder, and mix well. React in a water bath at 80±1°C for 4.5 hours; cool the mixture to room temperature, dilute it with 0.5L double-distilled water and let it stand overnight, then filter and separate it with a 0.22 micron-pore cellulose acetate filter, and wash it with a large amount of double-distilled water , the filter cake was naturally dried at room temperature; the above product, namely pre-oxidized graphite, was added to 120 mL of ice-bathed concentrated sulfuric acid under stirring conditions, and 15 g of potassium permanganate was slowly added while stirring, and the mixture was stirred and reacted for 0.5 hours under ice-bath conditions. ;The temperature of the water bath was raised to 35±1°C and the reaction was stirred for 2 hours; while s...

Embodiment 3

[0030] a) Add 2.5g of potassium persulfate and 2.5g of phosphorus pentoxide to 12mL of hot concentrated sulfuric acid at 90°C, mix and stir until the solid is completely dissolved, cool the mixture to 80±1°C, add 3g of graphite powder, and mix well. React in a water bath at 80±1°C for 4.5 hours; cool the mixture to room temperature, dilute it with 0.5L double-distilled water and let it stand overnight, then filter and separate it with a 0.22 micron-pore cellulose acetate filter, and wash it with a large amount of double-distilled water , the filter cake was naturally dried at room temperature; the above product, namely pre-oxidized graphite, was added to 120 mL of ice-bathed concentrated sulfuric acid under stirring conditions, and 15 g of potassium permanganate was slowly added while stirring, and the mixture was stirred and reacted for 0.5 hours under ice-bath conditions. ;The temperature of the water bath was raised to 35±1°C and the reaction was stirred for 2 hours; while s...

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Abstract

The invention provides a preparation method of graphene, which belongs to the technical field of synthesis of graphene and nano materials. The graphene is prepared by utilizing graphite oxide as a raw material and adopting environmental-friendly tea polyphenol / green tea juice as a reducing agent through a chemical reduction method without adding any stabilizing agent / dispersing agent. A graphene aqueous solution prepared by the invention has favorable dispersibility and stability without settling after standing for several months or generating an agglomerating phenomenon. The preparation method provided by the invention has advantages of simple process, easy popularization, low cost of the selected reducing agent, environmental protection and adaption of the requirements for low cost, large scale and green production. Any organic stabilizing agent / dispersing agent is not added in the process of preparing the graphene, which is beneficial to the following application of the graphene; and the adopted reducing agent and a reduzate which are environment-friendly have biocompatibility, and the prepared graphene is expected to be applied to the field of biochemistry.

Description

technical field [0001] The invention relates to a method for preparing graphene, which belongs to the technical field of graphene synthesis and nanomaterials, in particular to a method for preparing graphene based on tea polyphenol / green tea juice as a reducing agent. Background technique [0002] graphene is sp 2 Hybridized carbon atoms are arranged in a honeycomb hexagonal planar crystal, a new type of carbon nanomaterial with a thickness of only a single layer of atoms. It is the basic unit that constitutes graphite, carbon nanotubes, and fullerenes. It has very novel physical and chemical properties. Superconducting materials, microelectronics, sensors, and catalysis have very important application prospects (A.K.Geim, K.S. Novoselov, Nature Materials, 2007, 6, 183). Since graphene was discovered for the first time in 2004 (K.S.Novoselov, A.K.Geim, S.V.Morozov, D.Jiang, Y.Zhang, S.V.Dubonos, I.V.Grigorieva and A.A.Firsov, Science, 2004, 306, 666), it has immediately att...

Claims

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Application Information

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IPC IPC(8): C01B31/04
Inventor 吕弋宋红杰
Owner SICHUAN UNIV
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