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A kind of nitrogen-sulfur co-doped activated carbon and preparation method thereof

A nitrogen-sulfur co-doping, activated carbon technology, applied in chemical instruments and methods, carbon compounds, inorganic chemistry, etc. Surface area, simple operation effect

Active Publication Date: 2022-08-05
福建农林大学金山学院
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the good chemical stability and low surface activity of activated carbon itself, it is not easy to modify it.
The more effective modification method is to treat the carbon material with a strong oxidizing acid, but the disadvantage of this method is that it can etch the pore wall structure of the carbon material, destroying the pore structure, and the surface functional groups It is also difficult to effectively control the type, quantity and reproducibility

Method used

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  • A kind of nitrogen-sulfur co-doped activated carbon and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] The alkali / thiourea solution (20 g of sodium hydroxide, 20 g of potassium hydroxide, 40 g of thiourea, 160 g of water) was frozen. Then, take 80 g of sawdust with a particle size of 0.18-0.25 mm and mix it with the thawed alkali / thiourea solution, add 20 g of melamine, freeze at low temperature for 5 hours, then activate at 850 ° C for 1 hour, cool to room temperature, pickle and wash until The pH value is neutral and dried to obtain nitrogen-sulfur co-doped activated carbon.

[0017] In this example, the iodine adsorption value of nitrogen-sulfur co-doped activated carbon is 1172 mg / g, and the specific surface area is 1284 m 2 / g, the nitrogen content is 9.24%, and the sulfur content is 1.43%.

Embodiment 2

[0019] The alkali / thiourea solution (20 g of sodium hydroxide, 20 g of thiourea, 40 g of water) was frozen. Then, take 80 g of cotton and linen with a particle size of 0.18-0.25 mm and mix it with the thawed alkali / thiourea solution, add 30 g of acetonitrile, freeze at low temperature for 1 hour, then activate at 600 ° C for 3 hours, cool to room temperature, pickle and wash, Until the pH value is neutral, it is dried to obtain nitrogen-sulfur co-doped activated carbon.

[0020] In this example, the iodine adsorption value of nitrogen-sulfur co-doped activated carbon was 564 mg / g, and the specific surface area was 626 m 2 / g, the nitrogen content is 7.35%, and the sulfur content is 2.12%.

Embodiment 3

[0022] The alkali / thiourea solution (75 g of potassium hydroxide, 25 g of thiourea, 140 g of water) was frozen. Then, take 80 g of grass clippings with a particle size of 0.18-0.25 mm and mix with the thawed alkali / thiourea solution, add 40 g of polyaniline, freeze at low temperature for 3 hours, then activate at 900 ° C for 3 hours, cool to room temperature, and then carry out acid washing and water washing , until the pH value is neutral, and drying to obtain nitrogen-sulfur co-doped activated carbon.

[0023] In this example, the iodine adsorption value of nitrogen-sulfur co-doped activated carbon is 1326 mg / g, and the specific surface area is 1496 m 2 / g, the nitrogen content is 3.92%, and the sulfur content is 0.94%.

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Abstract

The invention discloses a nitrogen-sulfur co-doped activated carbon and a preparation method thereof. Under low temperature conditions, an alkali / thiourea system can dissolve cellulose of plant raw materials, break intramolecular or intermolecular hydrogen bonds, and at the same time thiourea and thiourea contain Nitrogen compounds enter the interior of plant raw materials and interact with phenolic hydroxyl, methoxy, ether bonds and other groups of plant raw materials to form cross-linked substances, fix nitrogen and sulfur atoms, and improve the doping of activated carbon. At the same time, the cross-linking substances help to form the skeleton structure of activated carbon and increase the pore structure and specific surface area of ​​activated carbon. The invention is simple to operate, green and environmentally friendly, and is expected to become a new production technology of high-performance activated carbon.

Description

technical field [0001] The invention belongs to the technical field of activated carbon preparation, in particular to a nitrogen-sulfur co-doped activated carbon and a preparation method thereof. Background technique [0002] Due to its good chemical properties, excellent mechanical stability, abundant pore structure, and excellent electrical conductivity, carbon materials have shown great promise in the fields of gas-liquid phase adsorption, separation, catalysis, supercapacitors, hydrogen storage, and batteries. potential. However, due to the good chemical stability and low surface activity of activated carbon itself, its modification is not easy. The most effective modification method now is to treat the carbon material with strong oxidizing acid, but the disadvantage of this method has a certain etching effect on the pore wall structure of the carbon material, so that the pore structure is destroyed, and the surface functional groups are damaged. The variety, quantity ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/324
CPCC01B32/324
Inventor 林冠烽王琼杨旋黄彪蔡政汉郑梅琴刘海雄梁倩陈艳希江时健
Owner 福建农林大学金山学院
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