Carbonized amino acid modified lignin and preparation method thereof

A lignin and amino acid technology, applied in chemical instruments and methods, carbon compounds, inorganic chemistry, etc., can solve the problems of difficulty in determining the complexity of functional groups and optimization, and achieve stable cycle performance without attenuation and high specific heat capacity.

Active Publication Date: 2022-01-21
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the complexity of the functional groups in lignin and the difficulty in determining the structure, it is difficult to optimize it

Method used

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  • Carbonized amino acid modified lignin and preparation method thereof
  • Carbonized amino acid modified lignin and preparation method thereof
  • Carbonized amino acid modified lignin and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Add industrial lignin to water, sonicate and filter to obtain samples. Then, dilute hydrochloric acid was added to the sample to adjust the pH to 2 while stirring, and the precipitated solid was filtered, washed with deionized water several times, and then freeze-dried to obtain refined lignin.

[0038]Pour 20g of lignin and 100mL of water into a three-necked flask equipped with a constant temperature water bath, a magnet, a dropping funnel and a reflux condenser, then adjust the pH of the solution to 9 with 0.1mol / L sodium hydroxide solution, and raise the temperature to to 50°C. Carefully add 1g formaldehyde and 12g methionine, raise the temperature to 80°C, and conduct Mannich reaction for 5h. Finally, add 0.1mol / L hydrochloric acid, precipitate at pH 4, subpackage in a centrifuge tube, ultrasonically clean, centrifuge, pour off the liquid, then add deionized water, repeat the steps of centrifugation and ultrasonication several times until the residue is washed with...

Embodiment 2

[0041] Add industrial lignin to water, sonicate and filter to obtain samples. Then, dilute hydrochloric acid was added to the sample to adjust the pH to 3 while stirring, and the precipitated solid was filtered, washed with deionized water several times, and then freeze-dried to obtain refined lignin.

[0042] Pour 15g lignin and 80mL water into a three-necked flask equipped with a constant temperature water bath, a magnet, a dropping funnel and a reflux condenser, then adjust the pH of the solution to 9 with 0.1mol / L sodium hydroxide solution, and raise the temperature to to 45°C. Carefully add 0.8g formaldehyde and 10g methionine, raise the temperature to 85°C, and conduct Mannich reaction for 4h. Finally, add 0.1mol / L hydrochloric acid, adjust the pH to 4 to precipitate, use a centrifuge tube to pack, ultrasonically clean, centrifuge, pour off the liquid, then add deionized water, repeat the steps of centrifugation and ultrasonication several times until the residue is was...

Embodiment 3

[0045] Add industrial lignin to water, sonicate and filter to obtain samples. Then, dilute hydrochloric acid was added to the sample to adjust the pH to 2 while stirring, and the precipitated solid was filtered, washed with deionized water several times, and then freeze-dried to obtain refined lignin.

[0046] Pour 25g of lignin and 120mL of water into a three-necked flask equipped with a constant temperature water bath, a magnet, a dropping funnel and a reflux condenser, then adjust the pH of the solution to 11 with 0.1mol / L sodium hydroxide solution, and raise the temperature to to 55°C. Carefully add 1.2g formaldehyde and 14g methionine, raise the temperature to 90°C, and conduct Mannich reaction for 6h. Finally, add 0.1mol / L hydrochloric acid, adjust the pH to 5 and precipitate, use a centrifuge tube to pack, ultrasonically clean, centrifuge, pour off the liquid, then add deionized water, repeat the steps of centrifugation and ultrasonication several times until the resid...

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Abstract

The invention belongs to the field of new materials, and particularly relates to carbonized amino acid modified lignin and a preparation method thereof. Industrial lignin is purified and then subjected to Mannich reaction with aldehyde and amino acid, nitrogen and sulfur elements are doped into lignin at the same time, and carbonized amino acid modified lignin meeting the green chemistry principle is obtained after high-temperature activation. The carbonized amino acid modified lignin is prepared into a porous carbon material through a two-step activation method, and the electrochemical performance of the carbonized amino acid modified lignin as a supercapacitor is inspected by using an electrochemical workstation. The layered porous carbon with a high specific surface area is prepared according to a common electrochemical performance research method, when the layered porous carbon is prepared into a supercapacitor, the supercapacitor has high specific heat capacity and stable cycle performance without attenuation, and the method has a wide application prospect in the aspect of preparing the porous carbon material for the supercapacitor.

Description

technical field [0001] The invention belongs to the field of new materials, and in particular relates to a carbonized amino acid modified lignin and a preparation method thereof. Background technique [0002] In modern industrial production, all kinds of energy are used to maintain production and life. However, due to the shortage of fossil energy, the development of new energy has become an urgent need. The development of green, environmentally friendly and effective energy storage devices has become necessary. Supercapacitors have the characteristics of high energy density, fast charging and discharging, and long cycle life. As the second most abundant natural polymer on the earth, lignin has a wide range of sources, rich resource content, and low acquisition cost. It is comparable to supercapacitors. The combination of has aroused extensive and close attention of researchers. Related literature shows that heteroatom-doped lignin capacitors have good electrochemical per...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/348C01B32/318H01G11/44H01G11/34H01G11/26
CPCC01B32/348C01B32/318H01G11/44H01G11/34H01G11/26Y02E60/13C08H6/00C08L97/005C01P2006/40
Inventor 李赢石刚王大伟王利魁
Owner JIANGNAN UNIV
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