Method for preparing biomass activated carbon through vacuum freeze drying

A vacuum freeze-drying and biomass technology, applied in chemical instruments and methods, carbon compounds, inorganic chemistry, etc., can solve problems such as weak synergistic adsorption capacity, increase in specific surface area, environmental pollution, etc., to protect the environment, reduce pollution, enrich The effect of the porous structure

Inactive Publication Date: 2017-06-09
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are still many problems in the process of preparing activated carbon by chemical activation, such as the improvement of specific surface area, the optimization of pore size distribution, the weak collaborative adsorption capacity for pollutants with different molecular sizes, and certain environmental pollution during production.

Method used

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  • Method for preparing biomass activated carbon through vacuum freeze drying
  • Method for preparing biomass activated carbon through vacuum freeze drying
  • Method for preparing biomass activated carbon through vacuum freeze drying

Examples

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Effect test

example 1

[0029] Physical pretreatment of moso bamboo: first take moso bamboo and place it in an oven at 100 degrees Celsius to dry for 24 hours, then crush it and pass it through an 80-mesh sieve for use. Tartaric acid hydrothermal treatment of moso bamboo: Take 5g of pulverized samples and place them in a 100ml polyethylene hydrothermal kettle liner, add 60ml of tartaric acid solution with a mass fraction of 10%, seal the reaction kettle after ultrasonication for 20-40 minutes, put Heat in an oven at 80°C for 2 hours. After the sample is cooled to room temperature, centrifuge and wash with distilled water until neutral to obtain a black intermediate product. Activator soaking and vacuum freeze-drying: Take 2g of the above-mentioned black sample and put it in a clean beaker, first add 3g of potassium hydroxide, sodium hydroxide or both, then add 20ml of deionized water, put it into a magnetic bar and stir After dispersing for 2-3 hours, the dispersion liquid is frozen with liquid nitro...

example 2

[0032] Physical pretreatment of moso bamboo: first take moso bamboo and place it in an oven at 100 degrees Celsius to dry for 24 hours, then crush it and pass it through an 80-mesh sieve for use. Tartaric acid hydrothermal treatment of moso bamboo: Take 5g of pulverized samples and place them in a 100ml polyethylene hydrothermal kettle liner, add 60ml of tartaric acid solution with a mass fraction of 10%, seal the reaction kettle after ultrasonication for 20-40 minutes, put Heat it in an oven at 100 degrees Celsius for 2 hours. After the sample is cooled to room temperature, centrifuge and wash with distilled water until neutral to obtain a black intermediate product. Activator soaking and vacuum freeze-drying: Take 2g of the above-mentioned black sample and put it in a clean beaker, first add 3g of potassium hydroxide, sodium hydroxide or both, then add 20ml of deionized water, put it into a magnetic bar and stir After dispersing for 2-3 hours, the dispersion liquid is frozen...

example 3

[0034] Physical pretreatment of moso bamboo: first take moso bamboo and place it in an oven at 100 degrees Celsius to dry for 24 hours, then crush it and pass it through an 80-mesh sieve for use. Tartaric acid hydrothermal treatment of moso bamboo: Take 5g of pulverized samples and place them in a 100ml polyethylene hydrothermal kettle liner, add 60ml of tartaric acid solution with a mass fraction of 10%, seal the reaction kettle after ultrasonication for 20-40 minutes, put Heat in an oven at 120°C for 2 hours. After the sample is cooled to room temperature, centrifuge and wash with distilled water until neutral to obtain a black intermediate product. Activator soaking and vacuum freeze-drying: Take 2g of the above-mentioned black sample and put it in a clean beaker, first add 3g of potassium hydroxide, sodium hydroxide or both, then add 20ml of deionized water, put it into a magnetic bar and stir After dispersing for 2-3 hours, the dispersion liquid is frozen with liquid nitr...

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Abstract

The invention discloses a method for preparing biomass activated carbon through vacuum freeze drying. The method comprises the following steps: performing steps of raw material crushing, acid treatment, activation soaking, freeze drying, high-temperature activation, acid pickling and the like, performing hydrothermal reaction on biomass raw materials with an acid solution, and further performing freeze drying treatment, thereby obtaining the biomass activated carbon. Compared with the prior art, the method has the advantages that the raw materials are rich and cheap, and rural wastes can be reused; by using a hydrothermal treatment technique in an acid environment, a part of substances in the biomass raw materials can be reduced, and porous loosened structures of the biomass raw materials are maintained; by using a vacuum freeze drying technique, original porous flurry structures of the biomass raw materials can be maintained to the maximum extent, the specific surface area of a product can be increased, and pore structures can be enriched; the biomass activated carbon prepared by using the scheme of the invention is high in specific surface area, rich in pore structure and excellent in synergic adsorption property of water body dye molecules and heavy metal ions, and has significant industrial application values.

Description

technical field [0001] The invention relates to the technical field of activated carbon preparation, in particular to a method for preparing biomass activated carbon by using crop waste as a carbon source in combination with acid hydrothermal treatment and vacuum freeze-drying techniques. Background technique [0002] my country is rich in biomass resources, but a large amount of biomass is directly incinerated and discarded, and cannot be used effectively. This not only pollutes the environment, but also causes waste of resources. Therefore, how to efficiently use biomass resources has become a serious concern of the country and society. question. At present, there are a variety of biomass utilization technologies, including biomass clean combustion technology, biomass gasification, liquefaction conversion technology, etc., which have been rationally used in energy and chemical industry. In recent years, the carbonization of biomass into activated carbon technology has uniq...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/348C01B32/324
CPCC01P2002/80C01P2004/03C01P2004/04C01P2006/12C01P2006/17
Inventor 张贤文刘建华朱国婷付一轩
Owner HEFEI UNIV OF TECH
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