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Nitrogen-doped carbon aerogel prepared by utilizing natural-structure macromolecular nano-fiber aerogel and preparation method of nitrogen-doped carbon aerogel

A nanofiber and carbon aerogel technology, applied in the field of carbon aerogel, can solve the problems of few active sites and single structure, and achieve the effects of simple equipment, high safety, and simple and easy method.

Active Publication Date: 2016-06-22
INST OF WOOD INDUDTRY CHINESE ACAD OF FORESTRY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the shortcomings of existing pure carbon airgel materials such as single structure and few active sites, and to provide a method for preparing nitrogen-doped carbon airgel by using natural structure polymer nanofiber airgel

Method used

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  • Nitrogen-doped carbon aerogel prepared by utilizing natural-structure macromolecular nano-fiber aerogel and preparation method of nitrogen-doped carbon aerogel
  • Nitrogen-doped carbon aerogel prepared by utilizing natural-structure macromolecular nano-fiber aerogel and preparation method of nitrogen-doped carbon aerogel
  • Nitrogen-doped carbon aerogel prepared by utilizing natural-structure macromolecular nano-fiber aerogel and preparation method of nitrogen-doped carbon aerogel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041]1. Rinse the bamboo purchased in the market, dry it and crush it through an 80-mesh sieve to obtain bamboo powder; take 1g of the crushed bamboo powder, use benzene:ethanol to extract at a ratio of 1:2, remove some organic matter, and then use glacial acetic acid Adjust the pH to 4.5 by adding 1wt% NaClO 2 Bleach by heating at 75°C for 1 hour;

[0042] 2. the bamboo powder after bleaching is prepared as 1wt% dispersion liquid, obtains 1wt% thick bamboo powder cellulose dispersion liquid by the method for mechanical disc grinding;

[0043] 3. Add the phosphate buffer solution to the above dispersion liquid, adjust the pH of the dispersion liquid to 6.8, stir in a magnetic stirrer at 1500rpm at room temperature and pressure for 10 minutes to make the bamboo powder cellulose better dispersed, then add TEMPO and NaClO, and disperse evenly. Add NaClO 2 , TEMPO:NaClO:NaClO 2 The molar ratio is 1:10:100, and the container is quickly sealed and heated to 70°C for 2 hours. Aft...

Embodiment 2

[0050] 1. Dried the raw shrimp skin, crushed it, and passed it through an 80-mesh sieve to obtain biological raw material powder;

[0051] 2. add lye to the dried shrimp raw material powder that step 1 obtains and process, remove part of the protein, then add hydrochloric acid solution to process, demineralize, then add lye to carry out further processing, demineralize and protein, finally add benzene, Ethanol or acetone are processed to obtain the shrimp skin raw material powder of degreasing, pigment, mineral salt and protein, and this powder is made into a 1wt% dispersion;

[0052] 3. Add TEMPO and NaClO to the obtained dispersion liquid, and then add NaClO after it is dispersed evenly 2 , where TEMPO:NaClO:NaClO 2 (Molar ratio) = 1:10:100, under magnetic stirring at 1200rpm, heated at room temperature to 80°C for 2h, after the reaction was completed, ethanol was added to terminate the reaction;

[0053] 4. Repeatedly rinse the dispersion liquid obtained in step 3 to neut...

Embodiment 3

[0058] 1. Weigh 2g of dry wood pulp and crush it to 60 mesh to obtain wood pulp powder;

[0059] 2. Extract the obtained bamboo pulp powder with benzene:ethanol at a ratio of 2:1 to remove some organic matter, then use glacial acetic acid to adjust the pH to 4-5 and add 1wt% NaClO 2 , bleached by heating at 75°C for 1h; then washed with water until neutral, prepared as a 1wt% dispersion, and stored at 4°C.

[0060] 3. Take 400mL of the above dispersion, stir well, then add 300mL of phosphate buffer solution to adjust the pH of the dispersion to 6.8.

[0061] 4. Then add TEMPO and NaClO, disperse evenly and then add NaClO 2 , TEMPO:NaClO:NaClO 2 The molar ratio is 1:10:100, and the container is quickly sealed and heated to 70°C for 1-2 hours. After the reaction, a certain amount of ethanol is added to terminate the reaction. The amount of ethanol added is ethanol:NaClO 2 =1:300 (molar ratio);

[0062] 5. Repeatedly wash the obtained dispersion liquid with deionized water to...

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Abstract

The invention discloses nitrogen-doped carbon aerogel prepared by utilizing natural-structure macromolecular nano-fiber aerogel. A biomass polysaccharide structural macromolecular material is prepared into cellulose aerogel through a mechanical method, a chemical oxidization pre-treatment method and an enzyme pre-treatment method, and is then treated in a nitrogen-rich atmosphere by a high-temperature pyrolysis method. With the adoption of the nitrogen-doped carbon aerogel, the utilization value of the biomass polysaccharide structural macromolecular material is improved, and novel concept and method are provided for efficiently utilizing carbon material resources.

Description

technical field [0001] The invention relates to carbon aerogels, in particular to a nitrogen-doped carbon aerogel prepared by using a natural structure macromolecule nanofiber aerogel and a preparation method thereof. Background technique [0002] Porous carbon airgel materials have a controllable pore structure and excellent surface chemistry, but it is not quite perfect. The structure of pure carbon airgel materials is relatively complete, but there are few active sites, which greatly limits the water solubility and reactivity of carbon materials. The doping of heteroatoms on carbon airgel materials can significantly improve its structure and conductivity. Among the many dopants, nitrogen is the most popular element. Nitrogen is in group VA in the periodic table of elements, adjacent to carbon atoms, and its atomic radius is also similar to that of carbon atoms. Therefore, the doping of nitrogen atoms can make the lattice distortion of carbon materials smaller. The lone...

Claims

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Application Information

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IPC IPC(8): C01B31/02
CPCC01P2002/72C01P2002/82C01P2004/03C01P2006/17
Inventor 卢芸殷亚方叶贵超焦立超姜笑梅董梦妤
Owner INST OF WOOD INDUDTRY CHINESE ACAD OF FORESTRY
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