Easy-control technology for preparing biomass skeleton carbon of micropore-mesopore structure and with high specific surface area

A technology with high specific surface area and mesoporous structure, applied in the fields of carbon compounds, inorganic chemistry, non-metallic elements, etc., can solve the problems of waste of chemical reagents, high corrosion of equipment, application limitations, etc., achieving low cost, low energy consumption, Simple and easy-to-control preparation conditions and processes

Active Publication Date: 2019-01-25
NANJING UNIV OF TECH
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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 crush the potato stalks, pass the 40-mesh sieve, and dry the stalks at 150°C for 12 hours, and then spray the 85wt% KOH solution onto the smashed dried straws. The ratio of biomass raw materials and alkaline substances is 1:0.01, and In a nitrogen atmosphere, the temperature is increased to 800°C at a rate of 10°C / min, and the temperature is maintained for 2 hours for high-temperature carbonization; the carbonized straw charcoal is heated to 280°C at a rate of 5°C / min in an air atmosphere, and the temperature is maintained for 2 hours. Low-temperature etching and activation process of stripping natural biomass to produce the 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 energy storage material, such as an organic dye methylene blue adsorbent, its methylene blue value is 300mg / g; it can also be used as a supercapa...

Embodiment 2

[0025] First crush the wheat straw, pass the 80-mesh sieve, and dry it at 150°C for 8 hours, and then combine 50wt% KOH and KHCO 3 The solution is sprayed into dry straw, the ratio of biomass raw material and alkali substance is 1:0.05, and the temperature is raised to 900°C at a rate of 5°C / min in a nitrogen atmosphere, and the temperature is kept for 2 hours to carry out high-temperature carbonization; after carbonization Straw charcoal is heated to 330°C at a rate of 2°C / min under air atmosphere, and kept for 5 hours for activation. The specific surface area of ​​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 energy storage material, such as an organic dye methylene blue adsorbent, its methylene blue value is 800mg / g; it can also be used as a supercapacitor electrode material, its electrochemical energy storage value> 250F / g.

Embodiment 3

[0027] First crush the wheat straw, pass the 20-mesh sieve, and dry the straw at 150°C for 6 hours, then spray 70wt% KOH solution onto the pulverized dry straw. The ratio of biomass raw material and alkali substance is 1:0.01, and In a nitrogen atmosphere, the temperature is increased to 600°C at a rate of 20°C / min, and the temperature is maintained for 1 hour for high-temperature carbonization; the carbonized straw charcoal is heated to 350°C at a rate of 5°C / min in an air atmosphere, and the temperature is maintained for 1 hour. Low-temperature etching and stripping of natural biomass activation process, 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 adsorption material and energy storage material, such as as organic dye methylene blue adsorbent, its methylene blue value is 150mg / g; it can also be used as supercapacitor electrode material, its electrochemical energy storage...

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Abstract

The invention discloses an easy-control technology for preparing biomass skeleton carbon of a micropore-mesopore structure and with a high specific surface area. The easy-control technology is characterized by comprising the steps: utilizing straws as a raw material, spraying a 50 wt% to 85 wt% potassium salt solution to the broken and dried straws, reacting for 1 to 4 hours under the 600 to 1,000DEG C nitrogen atmosphere and performing high temperature carbonization; keeping the carbonized straw carbon under the 280 to 350 DEG C air atmosphere warm for 1 to 7 hours, adjusting the potassium salt concentration and a reaction temperature and utilizing an activating technology of utilizing a sub-molten salt method to low temperature etch and peel natural biomass to prepare the biomass skeleton carbon. The specific surface area of the biomass skeleton carbon is 500 to 3,000 m<2>/g, and the most probable pore size is 1 to 20 nm. The technology disclosed by the invention has the characteristics of adjustable pore diameters in a micropore and mesopore range, no corrosion, greenness, low cost, simple and easy-control preparation conditions and technologies, wide raw material sources, favorability for scale production and application to the fields of high-efficiency adsorption, catalysis, energy storage and the like.

Description

Technical field [0001] The invention belongs to the technical field of preparation of porous carbon materials. Specifically, it relates to a preparation method of a microporous-mesoporous structured biomass skeleton carbon with controllable pore structure parameters such as specific surface area and pore volume, simple and easy control of synthesis conditions, no corrosion, green pollution, and low cost. Background technique [0002] Biomass energy is widely valued by countries all over the world due to its cleanliness and renewability. The European Union Horizon2020 plan also proposes to develop new biofuels on the basis of the original product value chain; and develop new biomass utilization strategies to address society and the environment Challenges. The U.S. Department of Energy proposes to use waste biomass including lignin more efficiently and actively seek high-performance and high-value-added biomass products in addition to biomass energy to improve the economics of the...

Claims

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Application Information

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Patent Type & Authority Applications(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 UNIV OF TECH
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