Preparation method of biomass-graded porous carbon material

A technology of hierarchical porous and biomass raw materials, applied in the field of porous carbon materials, can solve the problems of limited sources, high cost, complex process, etc., and achieve the effects of enhanced compatibility, good performance and wide adaptability

Active Publication Date: 2018-08-28
ZHENGZHOU UNIV
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  • Abstract
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  • 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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  • Preparation method of biomass-graded porous carbon material
  • Preparation method of biomass-graded porous carbon material
  • Preparation method of biomass-graded porous carbon material

Examples

Experimental program
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Effect test

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 , to obtain ultrafine carbon powder after collection and drying; in this embodiment, the treatment time of ultrafine treatment is 10h; the power of the ultrasonic wave is...

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Abstract

The invention particularly relates to a preparation method of a biomass-graded porous carbon material. The preparation method comprises the following steps that after pyrolytic carbonization, biomassmaterials are ground and sieved to obtain carbon-containing solid powder; after mixing the carbon-containing solid powder and a solvent, adopting ultrasonic-grinding coupling to carry out ultrafine treatment in the solvent to obtain ultrafine carbon powder; carrying out alkaline boiling, washing and drying on the ultrafine carbon powder to obtain high-purity solid carbon powder; heating and activating the high-purity solid carbon powder under the protective atmosphere to obtain an activated material; carrying out washing, acid boiling, washing and drying on the activated material to obtain thebiomass-graded porous carbon material. The preparation method has the beneficial effects that the process is simple and environment-friendly, the mass production is easy, the mesoporous / microporous structure can be accurately controlled, the adaptability in the aspect of developing biomass materials is wide, and the technical scheme is provided for comprehensive utilization of agricultural wastes.

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 Applications(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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