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Method for preparing graphene by using lignin

A technology of lignin and graphene, applied in graphene, chemical instruments and methods, non-metallic elements, etc., can solve the problems of low quality of graphene products, no graphene, long reaction period, etc., and achieve high value The effect of chemical utilization, abundant raw materials and short cycle

Active Publication Date: 2016-12-21
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Among them, the chemical vapor deposition method is simple to operate and the growth is controllable, but the conditions are harsh, the cost is too high, and it is difficult to commercialize; the chemical redox method is simple to prepare, the material is cheap, and it is expected to be mass-produced, but the reaction cycle is long and the quality of the obtained graphene product is low. Low, introducing too many defects and functional groups; other methods also have many problems
There is no report on the preparation of graphene by layer-by-layer self-assembly technology of lignin polyelectrolyte

Method used

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  • Method for preparing graphene by using lignin
  • Method for preparing graphene by using lignin
  • Method for preparing graphene by using lignin

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] (1) Make sodium lignosulfonate (sodium lignosulfonate, hereinafter referred to as SL) SL into a 1g / L aqueous solution, and weigh 20.20gFe(NO 3 ) 3 9H 2 O solid, dissolved in water to form a 0.1mol / L solution.

[0033] (2) Fully immerse the pretreated quartz glass slide in SL solution for 10 minutes, soak it in ultrapure water for 5 minutes after taking it out, then rinse it with ultrapure water several times, and dry it with cold wind; then put it into ferric nitrate solution Immerse in water for 10 minutes, take it out, soak it in ultrapure water for 5 minutes, rinse it several times, and dry it with cold wind; you can get a layer of SL / Fe 3+ Electrostatic self-assembled film; repeat the above operations to obtain 10 layers of SL / Fe 3+ Electrostatic self-assembled films.

[0034] (3) Place the sample obtained in step (2) in a tube furnace with two temperature zones, and feed H at a rate of 70mL / min. 2 / Ar (5:95, V / V) mixed gas is used as protective gas and reducing...

Embodiment 2

[0039] (1) Make SL into a 2g / L aqueous solution, weighing 26.28g NiSO 4 ·6H 2 O solid, dissolved in water to form a 0.2mol / L solution.

[0040] (2) Fully immerse the pretreated quartz glass slide in SL solution for 10 minutes, soak it in ultrapure water for 5 minutes after taking it out, then rinse it with ultrapure water several times, and dry it with cold wind; then put it into nickel sulfate solution Immerse in water for 10 minutes, take it out, soak it in ultrapure water for 5 minutes, rinse it several times, and dry it with cold wind; you can get a layer of SL / Ni 2+ Electrostatic self-assembled film; repeat the above operations to obtain 10 layers of SL / Ni 2+ Electrostatic self-assembled films.

[0041] (3) Place the sample obtained in step (2) in a tube furnace with two temperature zones, and feed H at a rate of 20mL / min. 2 / Ar (5:95, V / V) mixed gas was used as protective gas and reducing gas, and the temperature was programmed at a rate of 8°C / min at the same time. ...

Embodiment 3

[0044] (1) Make SL into a 4g / L aqueous solution, weighing 12.48gCuSO 4 ·5H 2 O solid, dissolved in water to form a 0.1mol / L solution.

[0045] (2) Fully immerse the pretreated copper sheet in the SL solution for 10 minutes, soak it in ultrapure water for 5 minutes after taking it out, then rinse it with ultrapure water several times, and dry it with cold wind; then put it into the copper sulfate solution Immerse for 10 minutes, take it out, soak it in ultrapure water for 5 minutes, rinse it several times, and dry it with cold wind; you can get a layer of SL / Cu 2+ Electrostatic self-assembled film; repeat the above operations to obtain 10 layers of SL / Cu 2+ Electrostatic self-assembled films.

[0046] (3) Place the sample obtained in step (2) in a tube furnace with two temperature zones, and feed H at a rate of 100mL / min. 2 / Ar (5:95, V / V) mixed gas was used as protective gas and reducing gas, and the temperature was programmed at a rate of 8°C / min at the same time. The te...

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Abstract

The invention belongs to the technical field of carbon material manufacturing technology, and in particular relates to a method for preparing graphene by using lignin as a raw material. The method is as follows: a layered or powdered material is used as a substrate, the lignin and a catalyst precursor are alternately assembled on the surface of the substrate by a layer-by-layer electrostatic self-assembly method, then a lignin / catalyst precursor / substrate composite is put into a double-temperature-zone tubular furnace, a H2 / Ar mixed gas is introduced into the double-temperature-zone tubular furnace at a certain speed, at the same time the double-temperature-zone tubular furnace is heated by a certain procedure, after the double-temperature-zone tubular furnace is heated to target temperature, the temperature of the double-temperature-zone tubular furnace is held for a certain time, when the double-temperature-zone tubular furnace is cooled to room temperature, the sample is taken out, and is soaked in an acid for catalyst removal, and after a plurality of times of washing and vacuum drying, the graphene is obtained. The method has the advantages of simple process and convenient operation, and the prepared graphene is good in growth, controllable in layer number and considerable in yield.

Description

technical field [0001] The invention belongs to the technical field of carbon material production technology, and in particular relates to a method for preparing graphene by using lignin as a raw material. Background technique [0002] As the second most abundant natural organic matter in nature, lignin exists widely in the xylem of most terrestrial plants, and its annual production in the world can reach 150 billion tons. It has a wide range of uses and can be used as surfactants, reinforcing agents, binders, water reducers, anti-scaling agents, corrosion inhibitors and dispersants, etc., covering many fields of industrial agriculture and has high utilization value. However, the current utilization efficiency of lignin is low, and most of it is used for burning, the recovery rate is low, and it pollutes the environment. It can be seen that it is necessary to develop a clean and efficient utilization technology of lignin. In this paper, the method of electrostatic layer-by...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/04
CPCC01B2204/04C01P2002/82C01P2004/03C01P2002/72
Inventor 邓永红邱学青王冰冰王秋君张力郑洪河赵华军石桥钱勇
Owner SOUTH CHINA UNIV OF TECH
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