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Method for preparing boron-doped carbon nanosheet from lignin and product

A carbon nanosheet, lignin technology, applied in nanocarbon, chemical instruments and methods, other chemical processes, etc., can solve the problems of uneven quality, complex process, high porosity, etc., and achieve excellent uniformity, thin thickness, High ductility effect

Active Publication Date: 2021-12-17
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] In view of the defects of the prior art, the object of the present invention is to provide a method and product for preparing boron-doped carbon nanosheets from lignin, and to prepare lamellar, low-density, high-porosity carbon nanosheets by designing a new process method. Boron-doped carbon nanosheets are designed to solve the problems of complex process, high cost, uneven quality and narrow application range of the process methods in the preparation of carbon nanosheets in the prior art

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  • Method for preparing boron-doped carbon nanosheet from lignin and product
  • Method for preparing boron-doped carbon nanosheet from lignin and product
  • Method for preparing boron-doped carbon nanosheet from lignin and product

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Effect test

Embodiment 1

[0053] S1 Dissolving alkali lignin, potassium phosphate and ammonium borate in water according to a preset mass ratio to prepare a mixed solution. Wherein, the mass range of lignin added per milliliter of water is 10 mg, the mass ratio of potassium phosphate to lignin is 1:1, and the mass ratio of ammonium borate to lignin is 1:12.

[0054] S2 Perform ultrasonic treatment on the mixed solution to fully dissolve potassium phosphate and boron-based additives, fully disperse lignin particles, induce self-assembly of lignin molecules, and fully undergo cross-linking and chelation reactions with borate groups to obtain lignin colloidal solution. Specifically, the power of the ultrasonic treatment is 100W, the frequency is 60Hz, and the time is 30min.

[0055] S3 Adding the lignin solution drop by drop into liquid nitrogen at a constant speed for rapid freezing, and then putting it into a freeze dryer to freeze-dry to obtain a lignin aerogel. Concretely, the dropping rate of the l...

Embodiment 2

[0060] S1 Dissolving alkali lignin, potassium phosphate and ammonium borate in water according to a preset mass ratio to prepare a mixed solution. Wherein, the mass range of lignin added per milliliter of water is 10 mg, the mass ratio of potassium phosphate to lignin is 1:10, and the mass ratio of ammonium borate to lignin is 1:12.

[0061] S2 Perform ultrasonic treatment on the mixed solution to fully dissolve potassium phosphate and boron-based additives, fully disperse lignin particles, induce self-assembly of lignin molecules, and fully undergo cross-linking and chelation reactions with borate groups to obtain lignin colloidal solution. Specifically, the power of the ultrasonic treatment is 100W, the frequency is 60Hz, and the time is 40min.

[0062] S3 Adding the lignin solution drop by drop into liquid nitrogen at a constant speed for rapid freezing, and then putting it into a freeze dryer to freeze-dry to obtain a lignin aerogel. Concretely, the dropping rate of the ...

Embodiment 3

[0067] S1 dissolving lignin, potassium phosphate and boron-based additives in water according to a preset mass ratio to prepare a mixed solution. Wherein, the lignin is alkali lignin, the mass range of lignin added per milliliter of water is 1 mg, and the mass ratio of potassium phosphate to lignin is 1:20. The boron additive is preferably boric acid, and the mass ratio of additive to lignin is 1:50.

[0068] S2 Perform ultrasonic treatment on the mixed solution to fully dissolve potassium phosphate and boron-based additives, fully disperse lignin particles, induce self-assembly of lignin molecules, and fully undergo cross-linking and chelation reactions with borate groups to obtain lignin colloidal solution. Specifically, the power of the ultrasonic treatment is 60W, the frequency is 40Hz, and the time is 10min.

[0069] S3 Adding the lignin solution drop by drop into liquid nitrogen at a constant speed for rapid freezing, and then putting it into a freeze dryer to freeze-d...

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Abstract

The invention discloses a method for preparing a boron-doped carbon nanosheet by using lignin and a product thereof, and belongs to the field of lignin utilization. The method comprises the following steps: firstly, adding lignin powder, potassium phosphate and a boron additive into water, carrying out ultrasonic treatment to obtain a dispersion liquid, then dropwise adding the dispersion liquid into liquid nitrogen, rapidly freezing, rapidly transferring to a freeze dryer, carrying out vacuum drying, and then pyrolyzing the obtained lignin aerogel in an inert atmosphere, the inorganic components in the coke are washed away with ethanol solution, and the boron-doped carbon nanosheet product is obtained after drying. The boron-doped carbon nanosheet has the characteristics of high specific surface area, low density, hierarchical pores and the like, and has good performance for adsorption of macromolecular dyes and preparation of hydrogen peroxide through electro-catalysis. The method disclosed by the invention is simple and feasible in process, suitable for various types of lignin and flexible to regulate and control, and the prepared product is good in uniformity.

Description

technical field [0001] The invention belongs to the field of lignin utilization, and more specifically relates to a method and product for preparing boron-doped carbon nanosheets from lignin. Background technique [0002] Lignin is the only natural aromatic polymer in nature, its content in biomass is second only to cellulose, and widely exists in industrial by-products such as papermaking black liquor and ethanol fermentation residue. According to statistics, the global paper industry produces about 50 million tons of industrial lignin every year, of which alkali lignin accounts for about 85%. Alkali lignin has rich active functional groups and a carbon content of more than 60%, which is a good precursor of carbon materials. [0003] The yield of coke obtained by high-temperature carbonization of alkali lignin is as high as 60%. However, due to the thermal melting characteristics of lignin, the direct pyrolysis coke has a small specific surface area, a single pore structur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/15B01J20/20C25B1/30C25B11/091
CPCC01B32/15B01J20/205C25B1/30C25B11/091
Inventor 杨海平董志国王贤华陈培骜陈应泉邵敬爱张雄曾阔杨晴张世红陈汉平
Owner HUAZHONG UNIV OF SCI & TECH
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