Lignin-based hierarchical porous carbon material and preparation method thereof

A lignin-based and lignin technology, which is applied in the field of lignin-based hierarchical porous carbon materials and their preparation, can solve the problems of high price, danger and high cost, and achieves increasing mesopore volume, increasing specific surface area and easy preparation. Effect

Active Publication Date: 2018-12-18
BEIJING FORESTRY UNIVERSITY
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  • Claims
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Problems solved by technology

In this type of method, the hard template method needs to use strong acid (such as hydrofluoric acid) to etch to remove the template, which is costly and dangerous. The soft template in the soft template method is not recyclable and the cost is high
[0006] (3) Lignin-based carbon fiber, the preparation method of this type of material uses methods such as melt spinning and electrospinning to prepare lignin fiber first, and then prepare porous carbon fiber through heat treatment combined with activation. This type of method is relatively complicated
However, its disadvantages are that the preparation of ionic liquids is relatively complicated, the price is high, and it is difficult to remove ionic liquids from the product.

Method used

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  • Lignin-based hierarchical porous carbon material and preparation method thereof
  • Lignin-based hierarchical porous carbon material and preparation method thereof
  • Lignin-based hierarchical porous carbon material and preparation method thereof

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preparation example Construction

[0031] The preparation method comprises the following steps:

[0032] Lignin pretreatment: Air-dry the raw material lignin, put it in an oven after crushing, and dry it at 80-100°C for 1-3 hours, and cool it to room temperature after drying to obtain a lignin sample for later use;

[0033] Preparation of deep eutectic solvent: uniformly mix anhydrous choline chloride and formic acid at a molar ratio of 1:1-5, stir at 50-80°C for 1 hour to obtain a clear and transparent liquid, place it in a closed oven, and heat it at 60-80°C Dry at ℃ for 4-6 hours, remove excess water, seal and cool to room temperature to obtain a deep eutectic solvent, set aside;

[0034] Thermal carbonization of lignin in deep eutectic solvent: mix the deep eutectic solvent and lignin sample evenly, place in a closed oven, and react at 60-190°C for 3-24h to obtain a thermal carbonization mixture;

[0035] Preparation of solvothermal carbonization products: under stirring, drop the thermal carbonization mix...

Embodiment 1

[0041] (1) Dry the prehydrolyzed lignin in an oven at 90°C for 2 hours, take it out and cool it to room temperature, and set it aside.

[0042] (2) Weigh the anhydrous choline chloride and formic acid at a molar ratio of 1:2, stir in a water bath at 80°C for 1 hour to mix, and obtain a clear transparent liquid, place it in an airtight oven at 80°C for 6 hours, Remove excess moisture, take it out, seal and cool to room temperature to obtain a deep eutectic solvent.

[0043] (3) Weigh 0.5g of prehydrolyzed lignin and place it in a polytetrafluoroethylene-lined container, add 5g of deep eutectic solvent, and after the prehydrolyzed lignin is completely dissolved, place it in a closed container and place it in an oven at 160°C React for 6h, take out and cool to room temperature and open.

[0044] (4) Under stirring, the mixed solution generated by the reaction in the airtight container was dropped into deionized water at 80°C, centrifuged at 8000rpm for 5min, washed twice with de...

Embodiment 2

[0052] (1) Dry the kraft lignin in an oven at 90°C for 2 hours, take it out and cool it to room temperature, and set it aside.

[0053] (2) Weigh the ratio of anhydrous choline chloride and formic acid at a molar ratio of 1:3 respectively, stir in a water bath at 80°C for 1 hour to mix, and obtain a clear transparent liquid, place it in an airtight oven at 80°C for 1 hour, Remove excess moisture, take it out, seal and cool to room temperature to obtain a deep eutectic solvent.

[0054] (3) Weigh 1g of kraft lignin and place it in a polytetrafluoroethylene-lined container, add 5g of deep eutectic solvent, and after the prehydrolyzed lignin is completely dissolved, place it in a closed container and react in an oven at 175°C 12h, take out and cool to room temperature and open.

[0055] (4) Under stirring, the mixed solution generated by the reaction in the airtight container was dropped into deionized water at 70°C, centrifuged at 8000rpm for 5min, washed twice with deionized w...

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Abstract

The invention relates to a lignin-based hierarchical porous carbon material and a preparation method thereof. The preparation method includes: lignin pretreatment, preparation of a eutectic solvent, eutectic solvent thermal carbonization of lignin, preparation of a solvent thermal carbonization product, activation of the solvent thermal carbonization product, and preparation of the lignin-based hierarchical porous carbon material. The m method provided by the invention adopts the eutectic solvent to dissolve the lignin raw material, is simple in preparation, and is green and non-toxic. The lignin-based hierarchical porous carbon material provided by the invention has abundant macroporous-mesoporous-microporous structures, is uniform and reasonable in distribution, and has good adsorption performance, and can be applied to supercapacitor electrode materials, lithium ion battery negative electrode materials, adsorption materials and other fields.

Description

technical field [0001] The invention belongs to the field of carbon materials, and in particular relates to a lignin-based hierarchical porous carbon material and a preparation method thereof. Background technique [0002] Activated carbon has a developed porous structure, and the internal specific surface area can reach 500 to 3000m 2 / g, high thermal stability and chemical stability, and abundant sources, the above properties make it widely used in adsorption, catalysis, energy storage and other fields. The pore structure of porous materials can be divided into macropores (>50nm), mesopores or mesopores (2-50nm) and micropores (<2nm) according to their size. Generally speaking, the pore structure of activated carbon is based on macropores and micropores. Mainly, less mesoporous structure. However, in many fields such as energy storage, adsorption, and filtration, the mesoporous structure of hierarchically porous carbon materials plays a vital role, so it is of grea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/318C01B32/348
CPCC01B32/318C01B32/348
Inventor 袁同琦孙润仓方巍王西鸾李凤凤庞博陈维婧
Owner BEIJING FORESTRY UNIVERSITY
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