Method for preparing graphene from lignin

A technology of lignin and graphene, applied in the directions of graphene, chemical instruments and methods, non-metallic elements, etc., can solve problems such as unfavorable development of graphene industrialization, small graphene area, increased cost, etc., and achieves reduction of preparation temperature, The effect of low cost and lower production cost

Active Publication Date: 2016-03-30
中航装甲科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, some noble metal catalysts are used in this method, which not only increases the cost, but also the prepared graphene has a small area and poor crystallization, which is not conducive to the industrialization of graphene.
[0007] In summary, among the existing methods for preparing graphene from lignin, there is no one that has no special requirements for production equipment, is suitable for large-scale production, and has a low production cost.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] This embodiment includes the following steps:

[0026] Take 1kg of lignin and put it into 10kg of sodium hydroxide solution, the quality of sodium hydroxide in the sodium hydroxide solution is 0.1kg, heat the temperature of the solution to 70°C, and keep it warm for 1 hour, then it will be treated with sodium hydroxide solution The obtained material was filtered and washed, and the solid matter obtained was dried at 60° C. for 20 hours to obtain pretreated lignin. Add 12g of iron powder to the pretreated lignin, set the working pressure of the high-pressure homogenizer to 20MPa, after the materials collide through the high-pressure homogeneous nozzle, they will flow to the slit homogenizing valve to homogenize the non-uniform lignin and Cracking, homogenizing the cracked carbon and catalyst in a high-energy state, fully obtaining a mixture of pretreated lignin and iron powder, putting the obtained mixture into an autoclave, filling it with nitrogen, and increasing the p...

Embodiment 2

[0028] This embodiment includes the following steps:

[0029] Take 1kg of lignin and put it into 10kg of sodium hydroxide solution, the quality of sodium hydroxide in the sodium hydroxide solution is 0.1kg, heat the temperature of the solution to 70°C, and keep it warm for 1 hour, then it will be treated with sodium hydroxide solution The obtained material was filtered and washed, and the solid matter obtained was dried at 60° C. for 20 hours to obtain pretreated lignin. Add 100g of iron powder to the pretreated lignin, set the working pressure of the high-pressure homogenizer to 20MPa, after the materials collide through the high-pressure homogeneous nozzle, they will flow to the homogenizing valve of the slit, so that the non-uniform lignin is homogenized and Cracking, homogenizing the cracked carbon and catalyst in a high-energy state, fully obtaining a mixture of pretreated lignin and iron powder, putting the obtained mixture into an autoclave, filling it with nitrogen, an...

Embodiment 3

[0031] This embodiment includes the following steps:

[0032] Take 1 kg of lignin and put it into 10 kg of potassium hydroxide solution, the potassium hydroxide solution contains 0.1 kg of potassium hydroxide, heat the temperature of the solution to 85°C, and keep it warm for 1 hour, then it will be treated with potassium hydroxide solution The obtained material was filtered and washed, and the solid matter obtained was dried at 60° C. for 20 hours to obtain pretreated lignin. Add 100g of iron powder to the pretreated lignin, set the working pressure of the high-pressure homogenizer to 40MPa, and after the material collides through the high-pressure homogenizer nozzle, it will flow to the homogeneous valve of the slit to homogenize the non-uniform lignin and Cracking, homogenizing the cracked carbon and catalyst in a high-energy state, fully obtaining a mixture of pretreated lignin and iron powder, putting the obtained mixture into an autoclave, filling it with nitrogen, and i...

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Abstract

The invention discloses a method for preparing graphene from lignin. The method comprises steps as follows: a, lignin and aqueous alkali are mixed in a volume ratio of solid to liquid being 1:(5-10), the solution is heated to the temperature of 70-100 DEG C, and the insulation treatment time is 1-3 h; b, a material treated by alkali is filtered and washed, an obtained solid is dried at the temperature of 60-80 DEG C, and pretreated lignin is obtained; c, a catalyst is added to the pretreated lignin obtained in Step b, the mixture is fully mixed by a high-pressure homogenizer, non-homogenous lignin is homogenized and split, and cracked carbon and the catalyst are homogenized to be in a high energy obtaining state; d, the mixture is placed in an autoclave, inert gas is introduced, the pressure is increased at the speed of 0.1-1 MPa/s to 20-50 MPa, the mixture is heated to 500-800 DEG C and cooled to the normal temperature and pressure after being treated, and graphene is obtained. The lignin is decomposed at the high temperature and under the high pressure, high-energy carbon atoms are obtained, graphene grows under the action of the catalyst, with the adoption of the method, the preparation temperature of the graphene is reduced, and the preparation technology is simple, economical, environment-friendly and suitable for industrial production.

Description

technical field [0001] The invention relates to the technical field of nanomaterial preparation, in particular to a method for preparing graphene. Background technique [0002] In 2004, graphene material was successfully prepared, which triggered a new wave of research on carbon materials. Graphene is a planar carbon nanomaterial composed of a layer of carbon atoms. It is the thinnest two-dimensional material known so far, with a thickness of only 0.335nm. It is composed of hexagonal lattices. The carbon atoms in graphene are connected by σ bonds, endowing graphene with extremely excellent mechanical properties and structural rigidity. Moreover, in graphene, each carbon atom has an unbonded p-electron. These p-electrons can move freely in the crystal, and the speed of movement is as high as 1 / 300 of the speed of light, which endows graphene with good conductivity. Optically, graphene is almost completely transparent, absorbing only 2.3 percent of light. With these peculia...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/04B82Y40/00
CPCC01B2204/04C01P2004/64
Inventor 陈庆曾军堂叶任海陈兵
Owner 中航装甲科技有限公司
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