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A kind of cellulose porous activated carbon and its preparation method and application

A cellulose and activated carbon technology, applied in chemical instruments and methods, non-metallic elements, carbon compounds, etc., can solve the problems of material difference, uneven activation dose, inaccurate reaction conditions, etc., and achieve low cost and good cycle stability. , the effect of environmentally friendly costs

Active Publication Date: 2021-10-26
TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the process of preparing carbon materials, the commonly used activation methods are soaking method and hydrothermal method, but the amount of activator entering the material is not uniform, and the reaction conditions are not accurate, resulting in certain differences in the prepared materials

Method used

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  • A kind of cellulose porous activated carbon and its preparation method and application
  • A kind of cellulose porous activated carbon and its preparation method and application
  • A kind of cellulose porous activated carbon and its preparation method and application

Examples

Experimental program
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Effect test

Embodiment 1

[0038] A method for preparing cellulose-based porous activated carbon, said method comprising the following steps:

[0039] (1) 1g cotton pulp cellulose and 1.6g potassium hydroxide are added to 18.4g water, mix and make mixture; Wherein 1.6g potassium hydroxide is joined in 18.4g water, the concentration of the potassium hydroxide solution of making is 8wt %;

[0040] (2) The mixture is made into cellulose jelly by ball milling; wherein the material of the ball milling tank and the balls is zirconia, and the ball-to-material ratio is 3.5:1; ball milling for 10 hours at a speed of 300rpm;

[0041] (3) freeze-drying the cellulose jelly at -80°C to obtain a solid mixture of cellulose and potassium hydroxide;

[0042] (4) Activate the solid mixture of carbonized cellulose and potassium hydroxide under nitrogen condition, the carbonization temperature is 600° C., and the carbonization time is 1 h to obtain cellulose-based porous activated carbon.

[0043] Such as figure 1 As sh...

Embodiment 2

[0045] A method for preparing cellulose-based porous activated carbon, said method comprising the following steps:

[0046] (1) 1g of cotton pulp cellulose and 1g of potassium hydroxide are added to 19g of water, and mixed to obtain a mixture; wherein 1g of potassium hydroxide is added to 19g of water, and the concentration of the prepared potassium hydroxide solution is 5wt%;

[0047] (2) The mixture is made into cellulose jelly by ball milling; wherein the material of the ball milling tank and the balls is zirconia, and the ball-to-material ratio is 3.5:1; ball milling for 10 hours at a speed of 300rpm;

[0048] (3) freeze-drying the cellulose jelly at -80°C to obtain a solid mixture of cellulose and potassium hydroxide;

[0049] (4) Activate the solid mixture of carbonized cellulose and potassium hydroxide under nitrogen condition, the carbonization temperature is 600° C., and the carbonization time is 1 h to obtain cellulose-based porous activated carbon.

[0050] The SEM...

Embodiment 3

[0052] A method for preparing cellulose-based porous activated carbon, said method comprising the following steps:

[0053] (1) 1g of cotton pulp cellulose and 0.6g of potassium hydroxide are added to 19.4g of water, and mixed to obtain a mixture, wherein 0.6g of potassium hydroxide is added to 19.4g of water, and the concentration of the prepared potassium hydroxide solution is 3wt %;

[0054] (2) The mixture is made into cellulose jelly by ball milling; wherein the ball milling tank and balls are made of zirconium dioxide, and the ball-to-material ratio is 3.5:1; ball milling for 10 hours at a speed of 300rpm;

[0055] (3) freeze-drying the cellulose jelly at -80°C to obtain a solid mixture of cellulose and potassium hydroxide;

[0056] (4) Activate the solid mixture of carbonized cellulose and potassium hydroxide under nitrogen condition, the carbonization temperature is 600° C., and the carbonization time is 1 h to obtain cellulose-based porous activated carbon.

[0057]...

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Abstract

The invention relates to a cellulose-based porous activated carbon and its preparation method and application. The method comprises the following steps: 1) mixing natural cellulose with an aqueous solution of an activator, fully grinding it into a fiber jelly, and freeze-drying to obtain a fiber 2) placing the solid mixture prepared in step 1) in an inert gas or nitrogen environment, and carbonizing it for 0.5-4 hours at a temperature of 500-1000° C. to obtain the product. The invention also discloses the application of the cellulose-based porous activated carbon on supercapacitor electrode materials. The invention is easy to operate and can strictly control the amount of raw materials and activators used. The prepared porous activated carbon has a very high specific surface area and can be widely used as electrode materials for supercapacitors.

Description

technical field [0001] The invention relates to the technical field of natural polymer materials, in particular to a cellulose-based porous activated carbon and its preparation method and application. Background technique [0002] As a key part affecting the electric energy storage capacity (capacitance) of supercapacitors, electrode materials must have the characteristics of large specific surface area and good cycle characteristics, and the research on their raw materials and preparation methods is particularly important. Porous carbon materials have attracted the attention of many researchers because of their advantages such as availability, tunable microstructure, and large specific surface area. [0003] In recent years, more porous carbon materials have been studied, including graphene, carbon nanotubes, and biomass carbonized materials. Graphene and carbon nanotubes have good electrical conductivity and large specific surface area, but their preparation methods are c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/342C01B32/348C01B32/318H01G11/24H01G11/40H01G11/44
CPCC01P2004/03C01P2006/12C01P2006/16C01P2006/40H01G11/24H01G11/40H01G11/44Y02E60/13
Inventor 吴敏黄勇张云秀孟秋华
Owner TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI