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Preparation method for biomass-based carbon nanofiber

A technology of carbon nanofibers and biomass, applied in the direction of nanotechnology, nanotechnology, fiber chemical characteristics, etc., can solve the problems of poor electrochemical performance and achieve the effect of enhancing electrochemical properties

Inactive Publication Date: 2020-05-26
XIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a preparation method of biomass-based carbon nanofibers, which solves the problem of poor electrochemical performance of biomass-based carbon nanofibers in the prior art

Method used

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  • Preparation method for biomass-based carbon nanofiber
  • Preparation method for biomass-based carbon nanofiber
  • Preparation method for biomass-based carbon nanofiber

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preparation example Construction

[0026] The method for preparing biomass-based carbon nanofibers of the present invention is specifically implemented according to the following steps:

[0027] Step 1. Mix lignin, butyric anhydride and 1-methylimidazole uniformly, and stir the reaction under nitrogen atmosphere. The reaction temperature is 40~80℃, and the reaction time is 4~12h. After the reaction is over, naturally cool to room temperature. Obtain a mixed solution; then the mixed solution is precipitated with n-hexane and washed 4-6 times, filtered to obtain a filter residue, and finally the filter residue is placed in deionized water, and stirred for 24h on a magnetic stirrer, filtered with suction, and freeze-dried to obtain esterification Modified lignin;

[0028] The mass ratio of lignin to butyric anhydride is 1-10: 1-5; the mass of 1-methylimidazole is 1 to 5% of the mass of lignin;

[0029] The mass ratio of filter residue to deionized water is 1:1000;

[0030] Freeze-drying temperature is -50℃, drying time i...

Embodiment 1

[0042] Firstly, 20 g of lignin, 40 g of butyric anhydride and 0.5 g of 1-methylimidazole were weighed into a 250 ml three-necked flask, stirred under a nitrogen atmosphere, the reaction temperature was 60° C., and the reaction time was 8 hours. After the reaction, the mixture was naturally cooled to room temperature, and the mixture was transferred to a large beaker of 1 L, and washed with 500 mL of n-hexane for 4 to 6 times, and each washing was fully stirred with a glass rod. Finally, the washed lignin suspension was placed in 500 mL of deionized water, and stirred on a magnetic stirrer for 24 hours. Then the mixture of water and lignin is filtered and dried to obtain esterified modified lignin. Spinning solution configuration: the total polymer mass fraction of the spinning solution is 20%, and the mass ratio of polyacrylonitrile to lignin is 40:60. First add the required amount of polyacrylonitrile to N,N-dimethylformamide, stir for a period of time at a speed of 600rpm at...

Embodiment 2

[0044] First, weigh 10g of lignin, 30g of butyric anhydride and 0.3g of 1-methylimidazole into a 250ml three-necked flask, stir under nitrogen atmosphere, reaction temperature 80°C, reaction time 4h. After the reaction, the mixture was naturally cooled to room temperature, and the mixed solution was transferred to a large beaker of 1 L, washed with 500 mL of n-hexane several times and fully stirred. Finally, the washed lignin was placed in 500 mL of deionized water and stirred for 12 hours using a magnetic stirrer. After suction filtration and freeze-drying, esterified modified lignin is obtained. Spinning solution configuration: the total polymer mass fraction of the spinning solution is 10%, and the ratio of polyacrylonitrile to lignin is 50:50. First add the required amount of polyacrylonitrile to N,N-dimethylformamide, stir for a period of time at 200 rpm at 40°C until the PAN is completely dissolved, and then add the corresponding amount of lignin to the polyacrylonitrile...

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Abstract

The invention discloses a preparation method for a biomass-based carbon nanofiber. The method particularly includes the following steps: first, mixing lignin with butyric anhydride and 1-methylimidazole, stirring under a nitrogen atmosphere for reaction, washing with n-hexane, then placing in deionized water, stirring, performing extraction filtration, and drying to obtain esterification modifiedlignin; dissolving polyacrylonitrile and the esterification modified lignin in a N, N-dimethylformamide solution to obtain a spinning solution; performing electrostatic spinning on the spinning solution to prepare a carbon nanofiber precursor, performing pre-oxidation on the carbon nanofiber precursor in a muffle furnace, and then performing carbonization treatment to obtain the biomass-based carbon nanofiber.The biomass-based carbon nanofiber prepared by the method of the invention is used as an electrode material of a super-capacitor, is excellent in electrochemical performance, and can meetapplication requirements in the fields of electric automobiles, high-load industries, new energy power storage, and the like.

Description

Technical field [0001] The invention belongs to the technical field of nanofiber preparation, and specifically relates to a preparation method of biomass-based carbon nanofibers. Background technique [0002] With the increasingly serious environmental pollution problem, the development of new energy sources is imminent. Under such circumstances, it is necessary to vigorously develop clean and renewable energy such as solar energy, geothermal energy, and nuclear fusion energy. However, these energy sources are restricted by their own conditions or natural factors, and have the characteristics of intermittent and instability. Therefore, it is necessary to vigorously develop an energy conversion and storage device to meet the large-scale application of these new energy sources. [0003] Supercapacitors, as a kind of original energy storage device between traditional capacitors and rechargeable batteries, have large power density and long cycle life and have a wide range of applicatio...

Claims

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Application Information

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IPC IPC(8): D01F9/17D01F9/22C08H7/00B82Y30/00B82Y40/00
CPCD01F9/17D01F9/22C08H6/00B82Y30/00B82Y40/00
Inventor 任鹏刚戴忠侯鑫何文维
Owner XIAN UNIV OF TECH
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