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Cellulose-based porous activated carbon as well as preparation method and application thereof

A porous activated carbon and cellulose technology, applied in chemical instruments and methods, non-metallic elements, inorganic chemistry, etc., can solve the problems of material differences, inaccurate reaction conditions, uneven activation dose, etc., and achieve low cost and good cycle stability Sexuality, environmental friendliness cost effect

Active Publication Date: 2019-03-05
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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  • Cellulose-based porous activated carbon as well as preparation method and application thereof
  • Cellulose-based porous activated carbon as well as preparation method and application thereof
  • Cellulose-based porous activated carbon as well as preparation method and application thereof

Examples

Experimental program
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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 cellulose-based porous activated carbon as well as a preparation method and application thereof; and the method comprises: 1) mixing natural cellulose with an activating agentwater solution, fully grinding the mixture into fiber jelly, freezing and drying to prepare a cellulose and activating agent solid mixture; and 2) placing the cellulose and activating agent solid mixture prepared in the step in an inert gas or nitrogen environment, and carbonizing for 0.5-4 hours at the temperature of 500-1000 DEG C to obtain the cellulose-based porous activated carbon. The invention also discloses application of the cellulose-based porous activated carbon to a supercapacitor electrode material. The method is simple to operate, and the use amount of a raw materials and an activating agent an be strictly controlled. The prepared porous activated carbon is extremely high in specific surface area and can be widely applied to electrode materials of 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 Applications(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