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An easy-to-control process for preparing bio-based carbon with microporous-mesoporous structure and high specific surface area

A technology with high specific surface area and mesoporous structure, which is applied in the field of preparation of biomass skeleton carbon, can solve the problems of high corrosion of equipment, waste of chemical reagents, pollution of the environment, etc., and achieve low cost, low energy consumption and wide source of raw materials Effect

Active Publication Date: 2020-12-29
NANJING TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the large amount of chemicals remaining on the activated carbon, it is necessary to wash the activated carbon to neutrality by washing, resulting in a large amount of acid-base waste liquid, which is very corrosive to the equipment, pollutes the environment, and causes a lot of waste of chemical reagents, which is limited in application.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] First, the potato stalks are crushed, and the stalks passed through a 40-mesh sieve are dried at 150°C for 12 hours, and then 85wt% KOH solution is sprayed on the crushed dry stalks. The mixing ratio of biomass raw materials and alkali substances is 1:0.01, and In a nitrogen atmosphere, the temperature was raised to 800°C at a rate of 10°C / min, and the heat preservation was carried out for 2 hours for high-temperature carbonization; the carbonized straw charcoal was heated to 280°C at a rate of 5°C / min in an air atmosphere, and the heat preservation was carried out for 2 hours. Activation process of low-temperature etching and peeling off natural biomass to produce a mesoporous structure of biomass skeleton carbon with a specific surface area of ​​1000m 2 / g, the most probable pore size is 5-7nm. The biomass skeleton carbon can be used as an adsorption material and an energy storage material, such as an organic dye methylene blue adsorbent with a methylene blue value of...

Embodiment 2

[0025] First, the wheat straw was crushed, and the straw passed through an 80-mesh sieve was dried at 150°C for 8 hours, and then mixed with 50wt% KOH and KHCO 3 Spray the solution onto the crushed dry straw, mix the biomass raw material and the alkali substance at a ratio of 1:0.05, raise the temperature to 900°C at a rate of 5°C / min in a nitrogen atmosphere, keep it warm for 2 hours, and carry out high-temperature carbonization; after carbonization The straw charcoal is heated up to 330°C at a rate of 2°C / min in the air atmosphere, and kept warm for 5 hours to activate. The specific surface area of ​​the biomass skeleton charcoal is 3000m 2 / g, the most probable pore size is 1-2nm. The biomass skeleton carbon can be used as an adsorption material and an energy storage material, such as an organic dye methylene blue adsorbent with a methylene blue value of 800mg / g; it can also be used as a supercapacitor electrode material with an electrochemical energy storage value>250F / g...

Embodiment 3

[0027] First, the wheat straw is pulverized, and the straw passed through a 20-mesh sieve is dried at 150°C for 6 hours, and then 70wt% KOH solution is sprayed onto the dried straw. In a nitrogen atmosphere, the temperature was raised to 600°C at a rate of 20°C / min, and the heat preservation was carried out for 1 hour for high-temperature carbonization; the carbonized straw charcoal was heated to 350°C at a rate of 5°C / min in an air atmosphere, and the heat preservation was carried out for 1 hour. Activation process of low-temperature etching and stripping natural biomass, the specific surface area of ​​biomass skeleton carbon is 500m 2 / g, the most probable pore size is 10-20nm. The biomass skeleton carbon can be used as an adsorption material and an energy storage material, such as an organic dye methylene blue adsorbent whose methylene blue value is 150 mg / g; it can also be used as a supercapacitor electrode material with an electrochemical energy storage value of 50 F / g g...

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Abstract

The invention discloses an easy-to-control process for preparing framework carbon with micropore-mesoporous structure and high specific surface area. It is characterized by using straw as raw material, spraying 50wt%-85wt% potassium salt solution on the crushed and dried straw, and reacting under nitrogen atmosphere at 600-1000°C for 1-4 hours to carry out high-temperature carbonization; and carbonizing Straw charcoal is kept in an air atmosphere at 280-350°C for 1-7 hours, and the biomass skeleton charcoal is prepared by adjusting the concentration of potassium salt and the reaction temperature by using the sub-molten salt method for low-temperature etching and stripping natural biomass. Specific surface area 500~3000m 2 / g, the most probable pore size is 1-20nm. The invention has the characteristics of pore size adjustment in the range of micropores and mesopores, no corrosion, green, low cost, simple and easy-to-control preparation conditions and processes, wide source of raw materials, and is conducive to large-scale production. It can be applied to high-efficiency adsorption, catalysis and Energy storage and other fields.

Description

technical field [0001] The invention belongs to the technical field of preparation of porous carbon materials. Specifically, it relates to a method for preparing biomass skeleton carbon with micropore-mesoporous structure with controllable pore structure parameters such as specific surface area and pore volume, simple and easy-to-control synthesis conditions, no corrosion, green and pollution-free, and low cost. Background technique [0002] Biomass energy has attracted worldwide attention due to its cleanliness and renewability. The European Union's Horizon 2020 plan also proposes to develop new biofuels on the basis of the original product value chain; and to develop new biomass utilization strategies to solve social and environmental problems. challenge. The U.S. Department of Energy proposes more efficient use of waste biomass including lignin and actively seeks high-performance and high-value-added biomass products other than biomass energy to improve the economy of th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/348C01B32/324
CPCC01B32/324C01B32/348C01P2006/16C01P2006/12C01B32/342
Inventor 朱家华陆小华穆立文
Owner NANJING TECH UNIV
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