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A kind of preparation method of lignin-based mesoporous carbon material

A technology of lignin and carbon materials, applied in chemical instruments and methods, carbon compounds, non-metallic elements, etc., can solve the problems of complex preparation process, unfavorable industrial production, high production cost, etc., and achieve simple preparation process, enhanced stability, The effect of improving the mechanical strength

Active Publication Date: 2021-01-26
NANJING TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Some disadvantages of the hard template method are that if additional templates need to be prepared, the entire preparation process is complicated, time-consuming, and the production cost is high, which is not conducive to industrial production.

Method used

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  • A kind of preparation method of lignin-based mesoporous carbon material
  • A kind of preparation method of lignin-based mesoporous carbon material
  • A kind of preparation method of lignin-based mesoporous carbon material

Examples

Experimental program
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Effect test

Embodiment 1

[0024] (1) Preparation of lignin with high silicon content: Take 5g of straw and crush it, add it to 90ml of NaOH solution with a concentration of 0.5mol / L, react for 5h, obtain the reaction solution, adjust the pH to 9 with 0.25mol / L hydrochloric acid, and then settle , 70vt% ethanol washing, low-temperature freeze-drying to obtain lignin with high silicon content;

[0025] (2) Carbonization of lignin: place the high-silicon-content lignin obtained in step (1) in an inert atmosphere furnace, heat up to 1000°C at a heating rate of 20°C / min, and heat-preserve and carbonize for 0.5h;

[0026] (3) Obtaining of mesoporous carbon material: the lignin carbonized in step (2) is mixed with 0.5mol / L potassium hydroxide solution according to the mass volume ratio of 1g:10ml, placed in an inert atmosphere furnace, and heated at 20°C / min Raise the temperature to 1000°C, heat-preserve carbonization reaction for 0.5h; after cooling to room temperature, wash with acidic water and pure water ...

Embodiment 2

[0028] (1) Preparation of lignin with high silicon content: Take 5g of straw and crush it, add it to 75ml of KOH solution with a concentration of 0.5mol / L, react for 5h, obtain the reaction solution, adjust the pH to 7 with 0.25mol / L hydrochloric acid, and then settle , 70vt% ethanol washing, low-temperature freeze-drying to obtain lignin with high silicon content;

[0029] (2) Carbonization of lignin: place the high-silicon-content lignin obtained in step (1) in an inert atmosphere furnace, heat up to 1000°C at a heating rate of 20°C / min, and heat-preserve and carbonize for 0.5h;

[0030] (3) Obtaining mesoporous carbon materials: Mix the carbonized lignin in step (2) with a mass volume ratio of 1:10 and 0.5mol / L potassium hydroxide solution, place it in an inert atmosphere furnace, and heat it at 20°C / min Raise the temperature to 1000°C, heat-preserve carbonization reaction for 0.5h; after cooling to room temperature, wash with acidic water and pure water until neutral, and ...

Embodiment 3

[0032] (1) Preparation of lignin with high silicon content: Take 5g of straw and crush it, add it to 150ml of KOH solution with a concentration of 0.75mol / L, react for 4h, obtain the reaction solution, adjust the pH to 5 with 0.25mol / L hydrochloric acid, and then settle , 70vt% ethanol washing, low-temperature freeze-drying to obtain lignin with high silicon content;

[0033] (2) Carbonization of lignin: place the lignin with high silicon content obtained in step (1) in an inert atmosphere furnace, heat up to 1000° C. at a heating rate of 20° C. / min, and keep warm for carbonization for 3 hours;

[0034] (3) Obtaining of mesoporous carbon material: the lignin carbonized in step (2) is mixed with 0.5mol / L potassium hydroxide solution according to the mass volume ratio of 1g:10ml, placed in an inert atmosphere furnace, and heated at 20°C / min Raise the temperature to 1000°C, heat-preserve carbonization reaction for 0.5h; after cooling to room temperature, wash with acidic water an...

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Abstract

The invention discloses a preparation method of a lignin-based mesoporous carbon material. The preparation method comprises the following steps: crushing straw, adding the crushed straw into an alkaline solution, carrying out a reaction for 0.5-5 hours to obtain a reaction solution, adjusting the pH value to 5-12 by using an acid, and then carrying out sedimentation, washing and drying to obtain lignin with a high silicon content; putting the lignin with a high silicon content in an inert atmosphere furnace, carrying out heating to 500-1000 DEG C at a temperature rising rate of 1-20 DEG C / min,and carrying out heat-preservation carbonization for 0.5-5 hours; finally mixing the carbonized lignin with a potassium hydroxide solution, putting the mixture into an inert atmosphere furnace, carrying out heating to 500-1000 DEG C at a temperature rising rate of 1-20 DEG C / min, and carrying out a heat-preservation carbonization reaction for 0.5-5 hours; and carrying out cooling to normal temperature, sequentially carrying out washing with acidic water and pure water to neutrality, and carrying out drying to obtain the mesoporous carbon material. The preparation process of the method provided by the invention is simple, the solvent can be recycled, the preparation process is simple, the conditions are mild, and the pore structure of the mesoporous carbon material can be accurately controlled.

Description

technical field [0001] The invention belongs to the field of carbon material preparation, in particular to a preparation method of lignin-based mesoporous carbon material. Background technique [0002] The demand for porous carbon materials will grow at a steady rate in the coming decades. Biomass-based mesoporous carbon materials have received increasing attention due to their renewable, sustainable, and environmentally friendly features. Lignin is the second largest natural organic polymer in plants after cellulose, and it is also the only renewable aromatic polymer containing benzene rings in plants. Lignin in particular has a carbon content of up to 50%, mainly composed of aromatic carbon. Lignin is an excellent substitute in the preparation of high-value and promising carbon materials, such as carbon fiber, activated carbon, hard carbon, etc. [0003] The resource utilization of lignin mainly includes the following aspects, one is to prepare polymer surfactants, the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/324C01B32/348C12N11/14
Inventor 庄伟饶远朱晨杰应汉杰李明唐成伦陈勇牛欢青吴菁岚柳东杨朋朋
Owner NANJING TECH UNIV
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