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A kind of preparation method of biomass hierarchical porous carbon material

A technology of graded porous and biomass raw materials, applied in the field of porous carbon materials, can solve the problems of limited sources, high cost, and few varieties, and achieve the effects of enhanced compatibility, good performance, and easy mass production

Active Publication Date: 2021-04-27
ZHENGZHOU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the preparation of porous carbon by the template method involves the embedding and removal of the template, which has high cost, complicated process, and high pollution; biomass raw materials with natural low-dimensional structure have few varieties and limited sources, which are difficult to meet large-scale commercial applications.
Common biomass with a wide source and low price, such as corncobs, often does not have a regular organizational structure, and alkali activation can obtain abundant micropores, but the content of mesopores is difficult to control
In addition, the solid carbides obtained after pyrolysis and carbonization of most agricultural wastes (such as corn cobs) often contain a lot of SiO x and other impurities (Energy Fuels, 2012, 26, 5905), because these impurities are often embedded in carbon particles, and the activated lye is difficult to enter due to the surface hydrophobicity of carbon particles, so it is difficult to completely and effectively remove these impurities by traditional alkali treatment
In practical applications, these impurities will have a negative impact on porous carbon electrode materials

Method used

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  • A kind of preparation method of biomass hierarchical porous carbon material
  • A kind of preparation method of biomass hierarchical porous carbon material
  • A kind of preparation method of biomass hierarchical porous carbon material

Examples

Experimental program
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Embodiment 1

[0051] The steps for preparing biomass porous carbon nanomaterials in this embodiment:

[0052] 1) Pyrolysis: Pyrolysis and carbonization of 30 g of dried and crushed corn cob particles in a nitrogen protective atmosphere, grinding the carbonized material, and passing through a 50-mesh sieve to obtain a carbon-containing solid powder; The decarburization conditions were as follows: at a nitrogen flow rate of 150 mL / min, the temperature was raised from 25 °C to 500 °C at a rate of 5 °C / min, and kept at 500 °C for 1 h.

[0053] 2) Ultrafine treatment: Disperse 15g of carbon-containing solid powder in step 1) in 300mL of isopropanol aqueous solution (the volume ratio of isopropanol to deionized water is 3:7), and then ultrasonically and sand mill together Under the effect of superfine treatment, to obtain a suspension, the suspension is centrifuged at 10000 rpm, collected and dried to obtain an ultrafine carbon powder; in the present embodiment, the treatment time of the superfin...

Embodiment 2

[0062] The steps for preparing biomass porous carbon nanomaterials in this embodiment:

[0063] 1) Pyrolysis: Pyrolysis and carbonization of 30 g of dried and crushed corn cob particles in a nitrogen protective atmosphere, grinding the carbonized material, and passing through a 50-mesh sieve to obtain a carbon-containing solid powder; The decarburization conditions were as follows: at a nitrogen flow rate of 150 mL / min, the temperature was raised from 25 °C to 500 °C at a rate of 5 °C / min, and kept at 500 °C for 1 h.

[0064] 2) Ultrafine treatment: Disperse 15g of carbon-containing solid powder in step 1) in 300mL of isopropanol aqueous solution (the volume ratio of isopropanol to deionized water is 3:7), and then ultrasonically and sand mill together Under the effect of superfine treatment, to obtain a suspension, the suspension is centrifuged at 10000 rpm, collected and dried to obtain an ultrafine carbon powder; in the present embodiment, the treatment time of the superfin...

Embodiment 3

[0070] The steps for preparing biomass porous carbon nanomaterials in this embodiment:

[0071] 1) Pyrolysis: Pyrolysis and carbonization of 30 g of dry and crushed straw particles in a nitrogen protective atmosphere, grinding the carbonized material, and passing through a 50-mesh sieve to obtain a carbon-containing solid powder; the pyrolysis described in this example The carbonization conditions were as follows: at a nitrogen flow rate of 150 mL / min, the temperature was raised from 25 °C to 400 °C at a rate of 3 °C / min, and kept at 400 °C for 1 h.

[0072] 2) Ultrafine treatment: Disperse 15g of carbon-containing solid powder in step 1) in 300mL of water, then perform ultrafine treatment under the combined action of ultrasound and sand mill to obtain a suspension, and centrifuge the suspension at 10,000 rpm , collected and dried to obtain ultra-fine carbon powder; in this embodiment, the treatment time of ultra-fine treatment is 10h; the power of the ultrasonic wave is 100W;...

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Abstract

The present invention specifically relates to a preparation method of biomass graded porous carbon material, which comprises the following steps: after pyrolytic carbonization of biomass raw materials, grinding and sieving to obtain carbon-containing solid powder; mixing carbon-containing solid powder with a solvent, Ultrasonic-sand milling coupling ultra-fine treatment in solvent to obtain ultra-fine carbon powder; ultra-fine carbon powder is boiled with alkali, washed with water, and dried to obtain high-purity solid carbon powder; high-purity solid carbon powder is heated in a protective atmosphere Activation to obtain an activated material; the activated material is washed with water, boiled with acid, washed with water, and dried to obtain a biomass porous nanomaterial. The invention has a simple process, is green, is easy to mass produce, can precisely control the mesopore / micropore structure, has wide adaptability in developing biomass raw materials, and provides a technical solution for the comprehensive utilization of agricultural waste.

Description

technical field [0001] The invention belongs to the technical field of porous carbon materials, and in particular relates to a preparation method of biomass graded porous carbon materials. Background technique [0002] Porous carbon material is the material of choice for supercapacitor electrodes. Its high specific surface area and abundant micropores play a key role in the performance of supercapacitors (Energy Environ. Sci., 2016, 9, 729). At the same time, porous carbon is used in dye wastewater It also has a wide range of applications in terms of processing (J. Environ. Chem. Eng., 2016, 4, 89). [0003] The precursor raw materials for the preparation of porous carbon materials mainly come from two aspects: one is synthetic polymers and petrochemical products (Chem. Rev., 2014, 114, 1673), and the other is biomass materials represented by agricultural waste (Renew. Sust. Energ. Rev., 2015, 46, 218). The preparation of porous carbon raw materials from synthetic polymers...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/324C01B32/348B01J20/20H01G11/34
CPCB01J20/20H01G11/34Y02E60/13
Inventor 陈德良杨德威张锐王兆武荆慧娟王凯许红亮李佳衡李鑫
Owner ZHENGZHOU UNIV
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