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Method of preparing graphene with lignin solution

A technology of lignin and graphene, applied in the field of nanometers, to achieve the effect of promoting functionalization and high-value utilization, and solving the problem of easy agglomeration

Active Publication Date: 2016-01-13
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, at present, there are few reports on the high-value utilization of lignin for the synthesis of graphene nanomaterials.

Method used

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  • Method of preparing graphene with lignin solution
  • Method of preparing graphene with lignin solution
  • Method of preparing graphene with lignin solution

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] 0.080 g of graphene oxide was dissolved in deionized water to form an 8.0 mg / mL graphene oxide aqueous solution, which was ultrasonically dispersed and placed in a heating reactor. Dissolve 0.005g lignin in 0.5wt% NaOH solution, and stir to obtain 0.5mg / mL lignin solution. Adjust the temperature of the heating reactor to 30°C, and slowly drop the above-prepared lignin sodium hydroxide solution into the graphene oxide solution. At this time, the weight ratio of lignin to graphene oxide is about 1:16. Stable dispersed graphene was obtained after 2 h of reaction.

Embodiment 2

[0024] 0.040 g of graphene oxide was dissolved in deionized water to form a 4.0 mg / mL graphene oxide aqueous solution, which was ultrasonically dispersed and placed in a heating reactor. Dissolve 0.010g lignin in 1.0wt% NaOH solution and stir to obtain 1.0mg / mL lignin solution. Adjust the temperature of the heating reactor to 50°C, slowly drop the lignin sodium hydroxide solution prepared above into the graphene oxide solution, at this time the weight ratio of lignin to graphene oxide is about 1:4. Stable dispersed graphene was obtained after 4 h of reaction.

Embodiment 3

[0026] 0.020 g of graphene oxide was dissolved in deionized water to form a 2.0 mg / mL graphene oxide aqueous solution, which was ultrasonically dispersed and then placed in a heating reactor. Dissolve 0.020g lignin in 1.5wt% NaOH solution, and get 2.0mg / mL lignin solution after stirring. Adjust the temperature of the heating reactor to 70°C, and slowly drop the lignin sodium hydroxide solution prepared above into the graphene oxide solution. At this time, the weight ratio of lignin to graphene oxide is about 1:1. Stable dispersed graphene was obtained after 6 h of reaction.

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Abstract

The invention discloses a method of preparing graphene with lignin solution, which includes the steps of dissolving lignin in an alkaline solution, wherein the lignin, which is extracted from papermaking black liquid, is employed as a reduction agent and a stabilizing agent, and performing a redox reaction to the lignin solution with a graphene oxide water solution under a heating condition to prepare stably-dispersed graphene by means of control on reaction temperature, reaction time and lignin concentration. The method is simple in operations, is a green, environment-friendly and quick graphene preparing method and completely satisfies the demand of green chemistry. Lignin is a natural biomass resource which is abundant, but however, is discharged as wastes largely, so that the method not only discloses a new approach of green-synthesis of graphene, but also has an important significance of development of high-valued utilization on resources.

Description

technical field [0001] The invention belongs to the field of nanotechnology, and in particular relates to a method for preparing graphene from a lignin solution. Background technique [0002] Graphene is a carbon atom with sp 2 The hybrid orbitals form a hexagonal planar two-dimensional crystal with a honeycomb shape. Single-layer graphene is only one carbon atom thick. It is currently the thinnest and hardest nanomaterial with excellent mechanical, thermal and electrical properties. The discovery of graphene and the preparation of its composite materials are important breakthroughs in the field of nanoscience and are of great significance to the development of modern nanoscience and technology. [0003] Lignin is mainly derived from the by-products of acid and alkaline pulping processes. At present, industrial lignin is dominated by a large amount of alkali lignin produced by alkaline pulping, which mainly comes from non-woody plant pulping. Alkali lignin has a low molec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/04
Inventor 王小英叶伟杰孙润仓
Owner SOUTH CHINA UNIV OF TECH
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