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Lignin carbon nanofiber and preparation method thereof

A nano-carbon fiber and lignin technology, applied in the field of materials, can solve the problems of easy clogging, poor lignin fibrillation, complex spinneret structure, etc., and achieve the effect of not being easy to clog and ensuring reliability

Active Publication Date: 2010-07-07
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the spinneret used in this method has a complex structure and is prone to clogging
[0011] The deficiencies of the prior art are related to the poor fibrillation of most lignins

Method used

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  • Lignin carbon nanofiber and preparation method thereof
  • Lignin carbon nanofiber and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] 1. Lignin pretreatment: Weigh 10g of wheatgrass lignin and dissolve it in 200mL of water whose pH value is adjusted to 8 with NaOH. Filter the solution successively with the filter membrane, take fractions with a relative molecular mass between 5000 and 50000, adjust the pH value to 5 with hydrochloric acid, concentrate and dry, and then use 100 mL of lignin with a volume ratio of 2:1 to Dissolve the 2-dichloroethane-ethanol mixture, separate the insoluble matter, add the supernatant to diethyl ether to precipitate the lignin, centrifuge the precipitate and wash it 5 times with diethyl ether, dry it in vacuum, and pulverize it;

[0036] 2. Preparation of spinning solution: Add 5g of lignin obtained in step 1 into 25mL of dimethyl sulfoxide, stir to make it completely dissolve, and become a solution;

[0037] 3. Electrospinning: use as figure 1 In the high-voltage electrospinning device shown, the positive and negative poles are connected to the spinneret 3 and the coll...

Embodiment 2

[0041] 1. Lignin pretreatment: Weigh 10g of bagasse alkali lignin and dissolve it in 200mL of water whose pH value is adjusted to 12 with NaOH. Filter the solution successively with the filter membrane, take fractions with a relative molecular mass between 5,000 and 50,000, adjust the pH value to 7 with hydrochloric acid, concentrate and dry, and then use 200 mL of lignin with a volume ratio of 1:1 to Dissolve the 2-dichloroethane-ethanol mixture, separate the insoluble matter, add the supernatant to diethyl ether to precipitate the lignin, centrifuge the precipitate and wash it 4 times with diethyl ether, dry it in vacuum, and pulverize it;

[0042] 2. Preparation of spinning solution: add 5g of lignin obtained in step 1 to 100mL of N,N-dimethylformamide, stir to make it completely dissolve, and become a solution;

[0043] 3. Electrospinning: use as figure 1 In the high-voltage electrospinning device shown, the positive and negative poles are connected to the spinneret 3 and...

Embodiment 3

[0047] 1. Lignin pretreatment: Weigh 10g of masson pine base lignin and dissolve it in 200mL of water with NaOH to adjust the pH value to 9. Ultrafiltration membranes filter the solution in sequence, take fractions with a relative molecular mass between 5000 and 50000, adjust the pH value to 7 with sulfuric acid, concentrate and dry, and then use 1 with a volume ratio of 2:1 for the dried lignin, Dissolve the 2-dichloroethane-ethanol mixture, separate the insoluble matter, add the supernatant to diethyl ether to precipitate lignin, centrifuge the precipitate and wash it 3 times with diethyl ether, dry it in vacuum, and pulverize it;

[0048] 2. Preparation of spinning solution: add 5g of lignin obtained in step 1 to 100mL of 1,4-dioxane, stir to make it completely dissolve, and become a solution;

[0049] 3. Electrospinning: use as figure 1 In the high-voltage electrospinning device shown, the positive and negative poles are connected to the spinneret 3 and the collecting pla...

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Abstract

The invention discloses a lignin carbon nanofiber and a preparation method thereof, belonging to the field of materials. The preparation method comprises 5 steps of lignin pretreatment, preparation of spinning solution, electrostatic spinning, pre-oxidation and carbonization. The preparation method is characterized in that the lignin pretreatment means that lignin with the relative molecular mass within 5,000 to 50,000 is selected, and then the treatment of removing carbohydrate and inorganic salt is respectively carried out on alkali lignin and acetic acid lignin (or formic acid lignin). The diameter of the obtained carbon nanofiber is within 50 to 300nm and the length is within 1 to 10mum. As the obtained lignin has good spinnability, the nanofiber can be spun and further processed into the carbon nanofiber without synthetic macromolecules. In addition, the method adopts simple electrospinning equipment for electrospinning, the diameter of a spinning nozzle is large, the blockage cannot easily occur, and the working reliability of the spinning equipment is ensured.

Description

technical field [0001] The invention belongs to the field of materials, in particular to a lignin nano-carbon fiber and a preparation method thereof. Background technique [0002] Carbon nanofiber is a kind of carbon fiber with nanoscale. According to its structural characteristics, it can be divided into carbon nanotubes and solid nano-carbon fibers. Solid nano-carbon fiber is a carbon fiber with a diameter of 10-500nm. In addition to the characteristics of general carbon fibers, such as low density, high specific strength, high specific modulus, high electrical and thermal conductivity, etc., it also has the advantages of very small number of defects, large specific surface area, and compact structure. Carbon nanofibers have broad application prospects in catalysts and catalyst supports, anode materials for lithium-ion secondary batteries, electrodes for electric double-layer capacitors, high-efficiency adsorbents, separators, super composite materials, hydrogen storage ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F9/17D01D1/02D01D1/10D01D5/00
Inventor 敖日格勒谌凡更周雪松冯玉
Owner SOUTH CHINA UNIV OF TECH
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