Charcoal-based nitrogen-enriched composite material as well as preparation and application thereof

A composite material and biochar technology, applied in other chemical processes, chemical instruments and methods, separation methods, etc., can solve problems such as insufficient intermolecular adsorption retention, insufficient hardness of metal-organic frameworks, and poor carbon dioxide adsorption effects, etc., to achieve Excellent carbon dioxide adsorption capacity, improved physical and chemical properties, and reduced impact effects

Active Publication Date: 2019-12-10
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology

[0006] Aiming at the above defects or improvement needs of the prior art, the present invention provides a biochar-based nitrogen-rich composite material, its preparation and application, which mixes the pyrolyzed biochar with the precursor solution of the metal skeleton material, so that the metal The organic framework material is synthesized in situ on the surface of biochar to obtain a biochar-based nitrogen-enriched composite material to improve its carbon dioxide adsorption effect, thereby solving the problem of low specific surface area and nitrogen content of the existing carbon dioxide adsorption materials and the ability to absorb carbon dioxide. The effect is not good, the metal-organic framework used for gas adsorption is insufficient in hardness, and the intermolecular adsorption retention is insufficient, etc.

Method used

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  • Charcoal-based nitrogen-enriched composite material as well as preparation and application thereof
  • Charcoal-based nitrogen-enriched composite material as well as preparation and application thereof
  • Charcoal-based nitrogen-enriched composite material as well as preparation and application thereof

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preparation example Construction

[0031] The invention provides a method for preparing a biochar-based nitrogen-enriched composite material, comprising the following steps:

[0032] (1) pyrolyzing the biomass to obtain biochar;

[0033] (2) Mix the metal organic framework material precursor solution with the biochar obtained in step (1) to obtain a mixed solution; the metal organic framework material precursor solution includes a metal salt solution obtained by dissolving a metal salt in a solvent and an organic ligand The organic ligand solution obtained by dissolving the body in a solvent, and the organic ligand contains nitrogen element;

[0034] (3) reacting the mixed solution described in step (2) under stirring conditions, so that it synthesizes a metal-organic framework material in situ on the surface of biochar; after the reaction is completed, the solid-liquid is separated, and the obtained solid is washed and dried to obtain the described Biochar-based nitrogen-enriched composites.

[0035] In some...

Embodiment 1

[0051] A preparation method of a biochar-based nitrogen-rich composite material, comprising the steps of:

[0052] (1) Pyrolyze bamboo chips, the atmosphere is carbon dioxide, the flow rate is 100mL / min, the heating rate is 10°C min, the pyrolysis temperature is 700°C, and the residence time is 1h;

[0053] (2) Dissolving zinc nitrate hexahydrate and 2-methylimidazole respectively in an organic solution and mixing, the organic solvent is methanol, and the mass ratio is 1:5:10;

[0054] (3) adding the biochar prepared in step 1 to the mixed solution prepared in step 2, fully mixing, and the mixing method is ultrasonic treatment;

[0055] (4) Put the mixed solution prepared in step 3 into a reactor with a stirrer to synthesize MOF in situ, the heating rate is 10°C / min, the reaction temperature is 40°C, the reaction time is 9h, and the stirring rate is 600rpm .

[0056] (5) After cooling, the solid obtained in step 4 was collected by centrifugation, and washed 3 times with fres...

Embodiment 2

[0069] A preparation method of a biochar-based nitrogen-rich composite material, comprising the steps of:

[0070] (1) Pyrolyze sawdust, the atmosphere is carbon dioxide, the flow rate is 50mL / min, the heating rate is 5°C min, the pyrolysis temperature is 400°C, and the residence time is 0.5h;

[0071] (2) Dissolving and mixing cobalt nitrate hexahydrate and 2-methylimidazole in an organic solution, the organic solvent is N,N-dimethylformamide, and the mass ratio is 1:1:5;

[0072] (3) adding the biochar prepared in step 1 to the mixed solution prepared in step 2, fully mixing, and the mixing method is ultrasonic treatment;

[0073] (4) Put the mixed solution prepared in step 3 into a reactor with a stirrer to synthesize MOF in situ, the heating rate is 10°C / min, the reaction temperature is 20°C, the reaction time is 9h, and the stirring rate is 1000rpm .

[0074] (5) After cooling, the solid obtained in step 4 was collected by centrifugation, and washed 3 times with fresh m...

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Abstract

The invention belongs to the technical field of composite materials and in particular relates to a charcoal-based nitrogen-enriched composite material as well as preparation and application thereof. The preparation comprises the following steps: mixing a metallic organic framework material precursor solution with pyrolysis charcoal so as to obtain a mixed liquid; enabling the mixed liquid to reactunder a stirring condition so as to obtain a metallic organic framework material on the surface of the charcoal through in-situ synthesis; and performing solid-liquid separation, namely washing and drying the obtained solid, so as to obtain the charcoal-based nitrogen-enriched composite material. The pyrolysis charcoal is mixed with the metallic organic framework material precursor solution, themetallic organic framework material is prepared on the surface of the charcoal through in-situ synthesis, the charcoal-based nitrogen-enriched composite material is prepared, and the carbon dioxide adsorption effect of the charcoal-based nitrogen-enriched composite material can be improved, so that the technical problems that in the prior art, a carbon dioxide adsorption material is small in specific surface area, low in nitrogen content, poor in carbon dioxide adsorption effect, insufficient in hardness of a metallic organic framework for gas adsorption, insufficient in intermolecular adsorption retention force, and the like, can be solved.

Description

technical field [0001] The invention belongs to the technical field of composite materials, and more specifically relates to a biochar-based nitrogen-enriched composite material, its preparation and application. Background technique [0002] At present, the concentration of carbon dioxide in the atmosphere has reached 400ppm. If there is no effective control method, it is expected to reach 500ppm by 2050, which will threaten the global ecological civilization. The traditional ways to treat carbon dioxide mainly include ammonia solution absorption method, membrane separation method, adsorption method, low temperature method, etc. Among them, the adsorption method has been widely studied due to its advantages of high energy utilization efficiency, low cost of equipment, convenient and simple operation, and wide temperature range. and apply. Commercial activated carbon is a common CO 2 Adsorbents, but their raw material sources and cost constraints have prompted more alternat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/22B01J20/20B01J20/30B01D53/02
CPCB01D53/02B01D2253/25B01D2257/504B01J20/20B01J20/226B01J20/3078B01J20/3085B01J2220/4825Y02C20/40
Inventor 张雄张俊杰黄丹茹邵敬爱张世红王贤华杨海平陈汉平
Owner HUAZHONG UNIV OF SCI & TECH
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