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Preparation method of biomass active carbon with high mesoporous rate and active carbon obtained thereby

An activated carbon and high mesoporous technology, applied in the field of activated carbon, can solve the problems of low specific surface area, long time consumption, and large pollution of activated carbon, and achieve the effects of low equipment requirements, reduced production cost, and simple production process

Inactive Publication Date: 2018-09-11
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this process needs to add water and ethanol to wash alternately after ion thermal carbonization, which causes great pollution and takes a long time; the specific surface area of ​​the prepared activated carbon is low, only 289-469m 2 / g.

Method used

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  • Preparation method of biomass active carbon with high mesoporous rate and active carbon obtained thereby
  • Preparation method of biomass active carbon with high mesoporous rate and active carbon obtained thereby
  • Preparation method of biomass active carbon with high mesoporous rate and active carbon obtained thereby

Examples

Experimental program
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Effect test

Embodiment 1

[0029] A kind of preparation method of high mesopority activated carbon is characterized in that comprising the following steps:

[0030] Step 1, raw material crushing, the recycled wood sawdust is crushed to 40-80 mesh, so as to ensure the consistency of raw material particle size.

[0031] Step 2, acid hydrothermal carbonization, take 4g of the biomass particles obtained in step 1 and place them in a reaction kettle with a 50mL Teflon liner, add 30mL of phosphoric acid solution with a mass fraction of 41%, and stir fully. At this time, phosphoric acid and sawdust The mass ratio of the reactor is 1:4. After sealing the reactor, place it in an oven and heat it to 200°C for 6 hours. Phosphoric acid is a medium-strength protonic acid, which can significantly promote the hydrolysis of high polysaccharides such as cellulose to form oligosaccharides or monosaccharide products, and then penetrate into the interior of the biomass structure to produce activation, and phosphoric acid c...

Embodiment 2

[0039]A kind of preparation method of high mesopority activated carbon is characterized in that comprising the following steps:

[0040] Step 1, raw material crushing, the recycled wood sawdust is crushed to 40-80 mesh, so as to ensure the consistency of raw material particle size.

[0041] Step 2, acid hydrothermal carbonization, take 4g of biomass particles obtained in step 1 and place them in a reaction kettle with a 50mL Teflon liner, add 30mL of phosphoric acid solution with a mass fraction of 49%, and stir fully. At this time, phosphoric acid and sawdust The mass ratio of the reactor is 1:5. After sealing the reactor, place it in an oven and heat it to 200°C for 9 hours. Phosphoric acid is a medium-strength protonic acid, which can significantly promote the hydrolysis of high polysaccharides such as cellulose to form oligosaccharides or monosaccharide products, and then penetrate into the interior of the biomass structure to produce activation, and phosphoric acid can ca...

Embodiment 3

[0049] A preparation method of high mesopority biomass activated carbon is characterized in that comprising the following steps:

[0050] Step 1, raw material crushing, the recycled wood sawdust is crushed to 40-80 mesh, so as to ensure the consistency of raw material particle size.

[0051] Step 2, acid hydrothermal carbonization, take 4g of the biomass particles obtained in step 1 and place them in a reaction kettle with a 50mL Teflon liner, add 30mL of phosphoric acid solution with a mass fraction of 62%, and stir fully. The mass ratio of the substances is 1:7. After sealing the reactor, place it in an oven and heat it to 200°C for 12 hours. Phosphoric acid is a medium-strength protonic acid, which can significantly promote the hydrolysis of high polysaccharides such as cellulose to form oligosaccharides or monosaccharide products, and then penetrate into the interior of the biomass structure to produce activation, and phosphoric acid can catalyze high polysaccharides and t...

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Abstract

The invention discloses a preparation method of biomass active carbon with high mesoporous rate and active carbon obtained thereby. The preparation method comprises the steps of: raw-material crushing, hydrothermal carbonization of acid, low-temperature activation, high-temperature activation and washing with water and the like, and phosphoric acids are adopted as activating agents to prepare biomass into active carbon. Compared with the prior art, the preparation method disclosed by the invention has the following advantages that the hydrothermal carbonization and one-time air activation areadopted to promote hydrolysis and dehydration reaction of the phosphoric acids for polysaccharides such as cellulose and hemicellulose and the like in biomass, so that the condensation reaction amongthe phosphoric acids is reduced and the activating effect of the phosphoric acids is promoted; the production process is simple, and the equipment requirement is low; no other catalysts need to be added, so that the production cost is reduced; the phosphoric acids for activation can be recovered after washing, so that no pollution is caused; the prepared active carbon has larger specific surface area and developed pore structure, wherein the total pore volume is 2.0447cm<3>.g<-1>, the mesoporous pore volume is 1.976cm<3>.g<-1>, the mesoporous rate is 95% or more, the effect for removing methylene blue is better and the market application prospect is great.

Description

technical field [0001] The present invention designs the technical field of activated carbon preparation, and in particular relates to a preparation method of high mesoporous activated carbon and the obtained activated carbon. Background technique [0002] Activated carbon has a wide range of applications in the industrial field. Due to its developed pore structure and high specific surface area, it has a wide range of applications in gas adsorption, liquid phase decolorization, environmental protection, catalyst carrier and electrode materials. For ordinary activated carbon, most of the pores are micropores with a diameter less than 2nm, and some dye molecules or gas molecules with larger molecules cannot enter the pores, resulting in a decrease in the adsorption capacity of activated carbon. Therefore, ordinary activated carbons have very limited applications in the adsorption of macromolecular pollutants. [0003] Compared with ordinary activated carbon, mesoporous activ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/324C01B32/342C01B32/336
CPCC01P2002/80C01P2004/03C01P2006/12C01P2006/14C01P2006/16
Inventor 马培勇王田张贤文陶常法邢献军
Owner HEFEI UNIV OF TECH
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