Preparation method of biomass activated carbon rich in nitrogen and oxygen

A technology for nitrogen-containing substances and biomass is applied in the field of special functional activated carbon materials, which can solve the problems of cumbersome process and unfavorable industrial production, achieve wide application prospects and improve wettability.

Active Publication Date: 2016-06-22
TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the above method either only introduces nitrogen heteroatoms, or adopts different steps to introduce nitrogen atoms and oxygen atoms respectively, and the process is cumbersome, which is not conducive

Method used

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  • Preparation method of biomass activated carbon rich in nitrogen and oxygen
  • Preparation method of biomass activated carbon rich in nitrogen and oxygen

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Add 10g of wheat husks into 100g of a mixed solution containing 10% ammonia by mass fraction and 5% potassium hydroxide by mass fraction, move it into a hydrothermal reaction kettle after fully soaking, and carry out hydrothermal reaction at 240 degrees for 2 hours. After the reaction is finished, cool to room temperature, and the product is taken out by filtration and dried, such as figure 1 As shown, the dried product was put into a high-temperature tube furnace, and reacted for 0.5 hours under the protection of nitrogen at 600 degrees Celsius. After the reaction is completed, the temperature is lowered to room temperature, and the product is taken out, washed repeatedly with deionized water, and dried to obtain sisal activated carbon fibers rich in nitrogen and oxygen. Such as figure 2 shown.

Embodiment 2

[0023] Add 3g of corn cobs to 60g of a mixed solution containing 30% ammonia by mass fraction and 10% potassium carbonate by mass fraction, move it into a hydrothermal reaction kettle after fully soaking, and carry out hydrothermal reaction at 180 degrees for 6 hours. After cooling to room temperature, the product was taken out by filtration and dried, then put into a high-temperature tube furnace, and reacted for 2 hours under the protection of nitrogen at 600°C. After the reaction is finished, cool down to room temperature, take out the product, wash it repeatedly with deionized water, and obtain corn cob activated carbon rich in nitrogen and oxygen after drying.

Embodiment 3

[0025] Add 10g of bamboo to 50g of a mixed solution containing 20% ​​ammonia by mass fraction and 15% potassium hydroxide by mass fraction, move it into a hydrothermal reaction kettle after fully soaking it, and carry out hydrothermal reaction at 220 degrees for 4 hours. After cooling to room temperature, the product was taken out by filtration and dried, then put into a high-temperature tube furnace, and reacted for 1 hour under the protection of nitrogen at 800 degrees Celsius. After the reaction is finished, the temperature is lowered to room temperature, the product is taken out, washed repeatedly with deionized water, and bamboo activated carbon rich in nitrogen and oxygen is obtained after drying.

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Abstract

The invention belongs to the technical field of special functional activated carbon materials, and provides a preparation method of biomass activated carbon rich in nitrogen and oxygen. The method comprises the following specific steps: adding a certain quantity of biomass raw materials into a solution containing nitrogen and alkaline substances; transferring all the substances into a hydrothermal reaction kettle; reacting at a certain temperature for a certain time period; at the end of the reaction, naturally cooling to a room temperature; taking a product out, and drying; performing high-temperature carbonization activation on the dried product in a high-temperature tubular furnace in a protective gas atmosphere for a certain time period; at the end of the reaction, naturally cooling; repeatedly washing the product with water, and drying to obtain a nitrogen-rich biomass activated carbon product. In the biomass activated carbon rich in the nitrogen and the oxygen, prepared with the method, nitrogen and oxygen heteroatoms are introduced, so that the water wetting property and electrolyte ion adsorption performance of a carbon material are enhanced. The method can be widely applied to pollutant treatment, separation of mixtures, electrode materials, and the like, and has a wide application prospect.

Description

technical field [0001] The invention belongs to the technical field of activated carbon materials with special functions, and in particular relates to a method for manufacturing biomass activated carbon rich in nitrogen and oxygen. Background technique [0002] Activated carbon rich in nitrogen and oxygen is a part of carbon atoms in the carbon structure replaced by nitrogen atoms and oxygen atoms, so it has unique surface chemical properties. Activated carbon rich in nitrogen and oxygen has better hydrophilicity than activated carbon without nitrogen. It has high adsorption performance for sulfur-based and nitrogen-based compounds, and has higher electrochemical performance due to the stronger delocalization ability of the electron layer of nitrogen atoms and oxygen atoms. At present, the common preparation methods for preparing nitrogen-containing and oxygen-containing activated carbon include template method, carbonization / activation method of nitrogen-containing precurso...

Claims

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Application Information

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IPC IPC(8): C01B31/08
Inventor 赵阳莫茹娟肖红梅吴敏
Owner TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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