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Lignin-based graphene preparation method

A technology of lignin and graphene, which is applied in the synthesis of graphene and the field of nanomaterials, to achieve the effects of simple process, low cost, good dispersion and stability

Inactive Publication Date: 2016-01-06
SUZHOU ZHENGYECHANG INTELLIGENT TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the GO reduction method often uses toxic or expensive reagents such as hydrazine or sodium borohydride as reducing agents, it is necessary to develop green, environmentally friendly, efficient and cheap chemical reduction technologies
However, there is no report on the preparation of reduced graphene oxide RGO using lignin as a reducing agent.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Dissolve 0.5g of alkali lignin in 9.5ml of deionized water to prepare a 5% aqueous solution of alkali lignin by mass, add NaOH to adjust the pH value to 10, mix the aqueous solution of lignin treated with NaOH with 1ml of 0.1g / L Graphene oxide solution was mixed, hydrothermally reacted at 120°C for 12h to obtain graphene solution, washed repeatedly with ethanol and deionized water, centrifuged at 8000r / min for 20min, dried at 60°C in a vacuum environment for 12h to obtain graphene powder.

Embodiment 2

[0019] Dissolve 1g of sulfonated lignin in 9ml of deionized water to prepare a lignin aqueous solution with a mass percentage of 10%, add NaOH to adjust the pH value to 11, mix the NaOH-treated lignin aqueous solution with 2ml of 0.5g / L graphite oxide Graphene solution was mixed, hydrothermally reacted at 140°C for 18h to obtain graphene solution, washed repeatedly with ethanol and deionized water, centrifuged at 10000r / min for 10min, dried at 70°C for 6h in a vacuum environment to obtain graphene powder.

Embodiment 3

[0021] Dissolve 0.8g of alkali lignin in 9.2ml of deionized water to prepare a lignin aqueous solution with a mass percentage of 8%, add NaOH to adjust the pH value to 12, and mix the NaOH-treated lignin aqueous solution with 5ml of 0.05g / L oxidation The graphene solution was mixed, hydrothermally reacted at a temperature of 160°C for 2 hours to obtain a graphene solution, washed repeatedly with ethanol and deionized water, centrifuged at a speed of 12000r / min for 5 minutes, and dried at 80°C for 2 hours in a vacuum environment to obtain a graphene powder .

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Abstract

The invention relates to a lignin-based graphene preparation method, which comprises the following steps: dissolving lignin in deionized water to prepare 5-10wt% of a lignin aqueous solution, adding NaOH to adjust pH value to 10-12, mixing the lignin aqueous solution treated with NaOH and 0.01-1 g / L of a graphene oxide solution according to the volume ratio of 10:1-1:1, carrying out a hydrothermal reaction at 120-160 DEG C for 1-24h to obtain a graphene solution, repeatedly cleaning with ethanol and deionized water, centrifuging, and carrying out drying treatment to obtain a graphene powder. According to the invention, lignin obtained after alkali treatment is used as a reducing agent, and graphene is obtained through a hydrothermal reaction. The preparation method is green and environmentally friendly; costs are low; the technology is simple; and the prepared graphene has good dispersity and stability.

Description

technical field [0001] The invention belongs to the technical field of graphene synthesis and nanometer materials, in particular to a method for preparing graphene based on lignin. Background technique [0002] In 2004, Andre Geim and Konstantin Novoselov, physicists at the University of Manchester in the United Kingdom, successfully separated graphene with single-layer atomic arrangement from graphite by tearing scotch tape. Therefore, he won the Nobel Prize in Physics in 2010 (Science, 2004, 306(5696):666-669). Graphene consists of carbon atoms with sp 2 The hybrid orbitals form a hexagonal honeycomb lattice, and its structural unit is a carbon six-membered ring, which is a two-dimensional material with a thickness of only a single layer of carbon atoms. Graphene is the basic structural unit that constitutes carbon-based materials. It can be wrapped to form zero-dimensional Fullerenes, rolled into one-dimensional carbonnanotube, and layered into three-dimensional graphi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/04
Inventor 赵兵
Owner SUZHOU ZHENGYECHANG INTELLIGENT TECH
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