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Preparation method for lignin-based biological carbon/graphene composite nanometer material

A graphene composite and lignin-based technology, which is applied in the field of preparation of lignin-based bio-carbon/graphene composite nanomaterials, can solve the problem of expensive sugars, low carbon formation rate, and inability to reflect the intrinsic characteristics of graphene, etc. problems, to achieve the effect of easy large-scale industrial production, low cost and low price

Active Publication Date: 2017-04-26
WUHAN INSTITUTE OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method uses sugars that are expensive and have a low carbon formation rate, which is only suitable for small batch production; moreover, the carbon and graphene form a coating structure that cannot reflect the intrinsic characteristics of graphene

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] (1) Preparation of graphene oxide powder: take 10g flake graphite and 5g NaNO 3 Slowly add 230ml of concentrated sulfuric acid with a mass fraction of 98%, place it at 0-4°C and stir for 8 hours to ensure thorough mixing, then slowly add 30g of KMnO 4 , reacted for 2.5 hours; then transferred to a 35°C water bath and continued to stir for 30 minutes; after the reaction was completed, slowly added 460ml of deionized water to dilute, then placed in a 95°C water bath and continued to stir for 30 minutes; dilute the reaction solution with warm deionized water , then add 25ml of 30% H 2 o 2 The solution was stirred. At this time, the solution was golden yellow. It was filtered while it was hot, and the brownish yellow precipitate was fully washed with 5% hydrochloric acid and deionized water until the pH was close to neutral. Dry the brownish-yellow precipitate in an oven at 60° C. for 48 hours, grind and sieve to obtain graphene oxide powder.

[0026] (2) Preparation of ...

Embodiment 2

[0033] The method in Example 1 was used to prepare lignin-based bio-carbon / graphene composite nanomaterials, the difference being that the amount of graphene oxide was changed from 4g to 8g, and other conditions remained unchanged.

[0034] After measurement, the BET specific surface area of ​​the wood-based bio-carbon / graphene composite nanomaterial prepared in this embodiment is 534m 2 / g, and the resistivity is 2.1Ω·m.

Embodiment 3

[0036] The method in Example 2 was used to prepare lignin-based bio-carbon / graphene composite nanomaterials, except that the amount of formaldehyde was changed from 21 g to 30 g, and other conditions remained unchanged.

[0037] After measurement, the BET specific surface area of ​​the wood-based bio-carbon / graphene composite nanomaterial prepared in this embodiment is 671m2 / g, and the resistivity is 2.5Ω·m.

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Abstract

The invention relates to a preparation method for a lignin-based biological carbon / graphene composite nanometer material. The preparation method comprises the following steps: preparation of a lignin solution; preparation of a lignin / graphene oxide mixed solution; preparation of a lignin / graphene composite; and preparation of the lignin-based biological carbon / graphene composite nanometer material: a step of heating the lignin / graphene composite under the protection of inert gas, and carrying out carbonization at a constant temperature so as to obtain the lignin-based biological carbon / graphene composite nanometer material. Compared with the prior art, the preparation method provided by the invention has the following beneficial effects: 1, the biological carbon source used in the preparation method provided by the invention is lignin which has low cost, is widely available and renewable, has high carbon content, and is easy to form a composite nanometer material with high biological carbon content with graphene; 2, the production process is simple and facilitates large-scale industrial production; and 3, the biological carbon / graphene composite nanometer material has ultrahigh specific surface area and excellent electrical conductivity.

Description

technical field [0001] The invention relates to a preparation method of a lignin-based biological carbon / graphene composite nanomaterial. Background technique [0002] Graphene, that is, a single layer of graphite, is a carbon atom with sp 2 The hybridization method forms a single atomic layer two-dimensional crystal material with a honeycomb structure. Compared with ordinary carbon materials, graphene has the characteristics of high specific surface area, high Young's modulus, high thermal conductivity, high electrical conductivity, high light transmittance, and easy functionalization. These excellent properties make graphene widely used in energy, environment, sensing, catalysis, biological detection and other fields. Since Novoselov and Geim first discovered graphene by micromechanical exfoliation in 2004, graphene has attracted extensive attention from researchers around the world. In order to obtain high-quality graphene, various preparation methods emerge in an endl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/184C01B32/05
CPCC01B2204/02C01P2006/12C01P2006/40Y02P20/54
Inventor 蒋灿杜飞鹏李亮鄢国平
Owner WUHAN INSTITUTE OF TECHNOLOGY
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