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Method for preparing nitrogen self-doped porous graphene using porous soybean shell

A porous graphene, self-doping technology, applied in graphene, chemical instruments and methods, inorganic chemistry, etc., can solve the problems of high cost of graphene acquisition, harm to human health, difficult industrial production, etc., to achieve large-scale The effect of production, saving raw material costs, and simplifying the production process

Inactive Publication Date: 2018-08-07
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, at present, organic polymers and polymers are mostly used in the preparation of nitrogen-doped graphene by self-doping. In this process, organic molecular gases (such as CH 4 ) as the carbon source, ammonia, pyridine, etc. as the nitrogen source, and hydrogen is introduced at the same time. The gases passed are all flammable and explosive gases, and the nitrogen source is poisonous. Industrial production seriously threatens life safety.
[0004] At present, the preparation of porous graphene structure is mostly obtained by heating graphene in strong alkali or potassium chloride [YanwuZ., Et Al., Science, 2011, 322, 1537l]. The process is cumbersome, and the raw material graphene high cost of acquisition

Method used

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  • Method for preparing nitrogen self-doped porous graphene using porous soybean shell
  • Method for preparing nitrogen self-doped porous graphene using porous soybean shell
  • Method for preparing nitrogen self-doped porous graphene using porous soybean shell

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] 1) Wash fresh soybean shells with water, place them in a common drying oven, and dry them at 100° C. to obtain curly dried soybean shell samples;

[0040] 2) Put the prepared soybean shell sample in step 1) in a multifunctional pulverizer, and pulverize it for 3 minutes to obtain the powder of soybean shell material;

[0041] 3) Weigh 5g of soybean shell powder and 15g of KOH solid in step 2) into a 250ml beaker, add 100g of water, stir in a constant temperature water bath at 80°C for 4h, take it out and dry it in a normal drying oven at 100°C for 24h;

[0042] 4) Place the consolidated block obtained in step 3) in a tube furnace, and raise the temperature to 800°C under an Ar gas protective atmosphere, with a heating rate of 5°C·min -1 , keep warm for 1h;

[0043] 5) After the product obtained in step 4) was manually ground, it was placed in 200ml 0.3M H 2 SO 4 Pickle in a constant temperature water bath at 80°C for 6 hours in the solution, filter with suction, and ...

Embodiment 2

[0055] 1) Wash fresh broad bean shells with water, place them in a common drying oven, and dry them at 80°C to obtain curly dried broad bean shell samples;

[0056] 2) Place the broad bean shell sample prepared in step 1) in a multifunctional pulverizer, and pulverize it for 4 minutes to obtain the powder of the bean shell material;

[0057] 3) Weigh 5g of the broad bean shell powder and 10g of KOH solid in step 2) and place it in a 250ml beaker, add 150g of water, stir in a constant temperature water bath at 90°C for 6h, take it out and dry it in an ordinary drying oven at 120°C for 48h;

[0058] 4) the consolidated block obtained in step 3) is placed in a tube furnace, and the 2 The temperature was raised to 550°C under a gas-protected atmosphere, and the heating rate was 6°C·min -1 , keep warm for 1.5h;

[0059] 5) After the product obtained in step 4) was manually ground, it was placed in 250ml 0.4M H 2 SO 4 Pickle in a constant temperature water bath at 80°C for 8 hou...

Embodiment 3

[0063] 1) Wash fresh mung bean shells with water, place them in a common drying oven, and dry them at 80° C. to obtain curly dried mung bean shell samples;

[0064] 2) Place the prepared mung bean shell sample in step 1) in a multifunctional pulverizer, and pulverize it for 3 minutes to obtain the powder of the mung bean shell material;

[0065] 3) Weigh 5g of the mung bean shell powder and 15g of KOH solid in step 2) and place it in a 250ml beaker, add 150g of water, stir in a constant temperature water bath at 70°C for 3h, take it out and dry it in an ordinary drying oven at 90°C for 20h;

[0066] 4) Put the consolidated block obtained in step 3) in a tube furnace, and raise the temperature to 600°C under the protective atmosphere of Ar gas, and the heating rate is 5°C·min -1 , keep warm for 2h;

[0067] 5) After the product obtained in step 4) was manually ground, it was placed in 250ml 0.5M H 2 SO 4 Pickling in a constant temperature water bath at 70°C for 7 hours in th...

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Abstract

The invention relates to a method for preparing nitrogen-auto-doped porous graphene by utilizing porous soybean hulls. The preparation method is characterized by carrying out ultrafine grinding on the porous soybean hulls as solid carbon sources and nitrogen sources, then fully mixing the powder with KOH, carrying out activation treatment and then carrying out pickling and freeze drying, thus obtaining nitrogen-auto-doped porous graphene. The method has the advantages that the natural porous soybean hulls are selected as the raw materials, the porous structures of the porous soybean hulls and plenty of crude proteins and amino acids contained in the porous soybean hulls are fully utilized, and meanwhile, as the solid carbon sources and nitrogen sources, the porous soybean hulls are directly converted to nitrogen-auto-doped porous graphene; the carbon content and nitrogen content of obtained graphene can be 78.0-95at.% and 7.3at.%; the raw materials are environmentally friendly and renewable, conform to the requirement of sustainable development and have wide sources and have the effect of effectively solving the problem of environmental pollution caused by discarding the raw materials while increasing the economic values of the raw materials.

Description

technical field [0001] The invention relates to a method for preparing nitrogen self-doped porous graphene by using porous bean shells, and belongs to the field of graphene material preparation. Background technique [0002] Graphene is a two-dimensional honeycomb lattice material formed by the close combination of planar single-layer carbon atoms. It is considered to be the basic unit for constructing all other dimensional graphite materials. Thin graphite planar structure. Graphene also has special properties such as room temperature quantum Hall effect and room temperature ferromagnetism. In addition, there is almost no resistance for electrons to pass through graphene, less heat is generated, and the conductivity is high. It is the material with the best conductivity known. Therefore, graphene materials have broad application prospects in the fields of catalysis, electronics, biology and energy storage. However, since graphene has no energy band gap, its electrical co...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/184
CPCC01B2204/04C01B2204/22C01B2204/32C01P2002/82C01P2002/85C01P2004/03C01P2004/04C01P2004/80C01P2006/14C01P2006/16
Inventor 木士春周煌张晨雨张建
Owner WUHAN UNIV OF TECH
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