Biomass-based nitrogen-doped porous carbon material, and preparation method and application thereof

A nitrogen-doped porous carbon and biomass material technology, applied in chemical instruments and methods, alkali metal compounds, other chemical processes, etc., can solve the problems of insufficiently developed pore structure of carbon materials, harsh reaction conditions, and complicated operation steps. Achieve the effect of overcoming low carbon dioxide adsorption capacity, uniform distribution and abundant resources

Inactive Publication Date: 2016-10-12
QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI +1
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Problems solved by technology

The carbon materials obtained by the late nitriding method have problems such as low nitrogen content and uneven distribution; the following problems generally exist in the nano-casting method, template method or solvent evaporation-induced self-assembly method: (1) Most of them are multi-step reactions, and the operation The steps are cumbersom

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  • Biomass-based nitrogen-doped porous carbon material, and preparation method and application thereof
  • Biomass-based nitrogen-doped porous carbon material, and preparation method and application thereof
  • Biomass-based nitrogen-doped porous carbon material, and preparation method and application thereof

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preparation example Construction

[0028] The preparation method of the nitrogen-doped porous carbon material according to the present invention is a one-step "foaming method". The porous nitrogen-doped carbon material synthesized by this method not only has a large specific surface area, pore volume, and abundant macropores / mesopores / Microporous multi-level pore structure, and the basic position of the porous material is increased, so that the porous nitrogen-containing material becomes an excellent carbon dioxide adsorption material, with high carbon dioxide adsorption capacity and good recycling performance.

[0029] In the preparation method according to the present invention, the activator plays an important role in the formation process of the nitrogen-doped porous carbon material, and it has the function of a pore-forming agent. Relative to the weight of the biomass material, when the amount of the activator is less than 0.1 times, it will affect the formation of the porous structure of the material, an...

Embodiment 1

[0039]Cut 1 kg of cleaned sweet potato leaves into pieces, heat them in an oven at 70° C. to dry, and grind the solids into powders. Take 5g powder and 5g NaHCO 3 Add 20mL of water and heat to dryness at 100°C. Afterwards, the obtained dry solid was calcined in a tube furnace in a nitrogen gas atmosphere, and kept at 600° C. for 2 hours. After the tube furnace dropped to room temperature, the samples were taken out, washed several times with 1% hydrochloric acid and water, and dried at 100° C. to obtain nitrogen-doped porous carbon materials.

[0040] figure 1 This is the SEM photo of the nitrogen-doped porous carbon material prepared according to this example. It can be seen from the photo that the nitrogen-doped porous carbon material prepared according to this example has an obvious three-dimensional porous network structure, and the pore structure is remarkable. Elemental analysis results showed that the nitrogen content was 3.2 at%. BET test shows that its specific su...

Embodiment 2

[0042] Cut 1 kg of cleaned asparagus into pieces, heat to dry in an oven at 70° C., and grind the solid into powder. Take 5g powder and 5g KHCO 3 Add 20mL of water and heat to dryness at 100°C. Afterwards, the obtained dry solid was calcined in a tube furnace in a nitrogen gas atmosphere, and kept at 600° C. for 2 hours. After the tube furnace dropped to room temperature, the samples were taken out, washed several times with 1% hydrochloric acid and water, and dried at 100° C. to obtain nitrogen-doped porous carbon materials. The elemental analysis results show that the nitrogen content of the material is 3.6at%, and the BET test results are as follows figure 2 As shown, the specific surface area is about 963m 2 / g, the pore volume is 0.48cm 3 / g. like image 3 As shown in the SEM photos in , the material has a three-dimensional porous structure and contains a large number of micropores and a certain amount of mesopores and macropores.

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Abstract

The invention provides a preparation method of biomass-based nitrogen-containing porous carbon with the advantages that simplicity is realized; the implementation is easy; the cost is low. According to the method, the in-situ doping of nitrogen atoms in the carbon material preparation process is realized by a one-step foaming method; cheap and reproducible protein-rich plants are used as carbon precursors; the in-situ doping of nitrogen atoms in the carbon material preparation process is favorably realized, so that the doping content is controllable, and the distribution is uniform. All raw materials are renewable resources; green and environment-friendly effects are achieved; simplicity is realized; the obtaining is easy; the resources are rich; the cost is low. Meanwhile, the method provided by the invention has the advantages that the nitrogen-doped porous carbon material with the large specific surface area can be obtained without complicated multistep operation; the preparation process is simple; the use of high-pollution chemical reagents such as ZnC12, strong base and strong acid is avoided; the environment-friendly effect is achieved; the operation is convenient; equipment cannot be corroded in the production and use processes; the method is suitable for large-scale production.

Description

technical field [0001] The invention belongs to the field of inorganic nanometer materials, and relates to a nitrogen-doped porous carbon material for carbon dioxide adsorption based on biomass raw materials and a preparation method thereof. Background technique [0002] In recent years, as the emission of carbon dioxide has increased year by year, the excessive emission of carbon dioxide has caused the imbalance of carbon content in the regional ecological environment system and caused global warming. The "greenhouse effect" has become one of the most concerned environmental issues in the world today. In order to reduce and control the "greenhouse effect" and improve the effective utilization rate of carbon dioxide, the capture and utilization of carbon dioxide at room temperature has become an important strategic direction in the field of environment and energy in my country. Therefore, it is of great significance to prepare carbon dioxide adsorption recovery materials th...

Claims

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Application Information

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IPC IPC(8): C01B31/12B01J20/20B01J20/28
CPCB01J20/20B01J20/0259B01J20/28064B01J20/28066B01J2220/4806B01J2220/4812C01P2002/80C01P2004/03C01P2004/30C01P2006/12
Inventor 陈秀芳费本华牟新东张波刘志佳
Owner QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
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