Polyimide carbon fiber containing ultramicro pores and preparation method and application thereof

A polyimide-based carbon fiber, polyimide fiber technology, applied in separation methods, fiber chemical characteristics, chemical instruments and methods, etc., can solve the problems of complex operation, undisclosed carbon dioxide adsorption capacity, etc., and simplify the preparation process. , The effect of shortening the production cycle and high yield

Active Publication Date: 2020-09-11
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The pore size distribution of the porous polyimide fiber is between 2 and 900nm, the carbon dioxide adsorption capacity is not disclosed, and the preparation method includes pickling and water washing, the operation is complicated, and a large amount of waste water is generated

Method used

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  • Polyimide carbon fiber containing ultramicro pores and preparation method and application thereof
  • Polyimide carbon fiber containing ultramicro pores and preparation method and application thereof
  • Polyimide carbon fiber containing ultramicro pores and preparation method and application thereof

Examples

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Embodiment 1

[0053] The present invention uses embodiment 1 as a comparative example. The domestic Yilun fiber was placed in a heat treatment furnace and treated in a nitrogen atmosphere at 800°C for 60 minutes to obtain polyimide-based carbon fiber 1 containing ultra-micropores.

[0054] The nitrogen isothermal adsorption-desorption curve measured at -196°C for the polyimide-based carbon fiber 1 containing ultramicropores is as follows: figure 1 As shown, according to the IUPAC classification, it can be known that the nitrogen isothermal adsorption-desorption curve conforms to type I, and contains a smaller hysteresis loop, indicating that the pores of the polyimide-based carbon fiber 1 containing ultramicropores are mostly micropores, and there are a small amount of micropores. of mesopores.

[0055] The specific surface area of ​​polyimide-based carbon fiber 1 containing ultramicropores is 448m 2 / g, the micropore volume is 0.143cm 3 / g, ultramicropore volume is 0.131g / cm 3 , The ni...

Embodiment 2

[0058] The mass ratio of potassium carbonate to domestic Yilun fiber is 2, the polyimide fiber is put into a 4% potassium carbonate aqueous solution, mixed and stirred, taken out and dried, and treated at 800°C for 60 minutes in a nitrogen atmosphere to obtain a polyimide fiber containing Ultramicroporous polyimide-based carbon fibers2.

[0059] The nitrogen isothermal adsorption-desorption curve measured at -196°C for the polyimide-based carbon fiber 2 containing ultramicropores is as follows: image 3 As shown, according to the IUPAC classification, it can be known that the nitrogen isothermal adsorption-desorption curve conforms to type I, and no obvious hysteresis loop is observed, indicating that the polyimide-based carbon fiber 2 containing ultramicropores is mainly micropores, and the micropores The pore size distribution range is relatively wide, and it also has narrow mesopores. The specific surface area of ​​polyimide-based carbon fiber 2 containing ultramicropores ...

Embodiment 3

[0063] The mass ratio of zinc chloride to domestic Yilun fiber is 2, the polyimide fiber is put into a zinc chloride aqueous solution with a concentration of 4%, mixed and stirred, taken out and dried, and treated at 800°C in a nitrogen atmosphere for 60 minutes, A polyimide-based carbon fiber 3 containing ultramicropores was obtained.

[0064] The nitrogen isothermal adsorption-desorption curve measured at -196°C for the polyimide-based carbon fiber 3 containing ultramicropores is as follows: Figure 6 As shown, according to the IUPAC classification, it can be seen that the nitrogen isotherm adsorption-desorption curve conforms to type I, and no obvious hysteresis loop is observed, indicating that the polyimide-based carbon fiber 3 containing ultramicropores is mainly micropores. Polyimide-based carbon fiber 3 containing ultra-micropores, with a specific surface area of ​​792m 2 / g, the micropore volume is 0.302cm 3 / g, ultramicropore volume is 0.188g / cm 3 , The nitrogen c...

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Abstract

The invention discloses a polyimide carbon fiber containing ultramicro pores, and a preparation method and an application thereof. The polyimide carbon fiber contains the ultramicro pores, the ultramicro pores are pores with diameter of less than or equal to 0.8nm; specific area of the polyimide carbon fiber is 200-2500m2/g, micro pore volume is 0.05-0.75cm3/g, nitrogen content is 1-7.5%, and themicro pore is the pore with diameter of less than or equal to 2nm. The polyimide carbon fiber containing the ultramicro pores has excellent adsorbability to carbon dioxide, and can be used in the field of adsorption of the carbon dioxide. The invention also provides a preparation method of the polyimide carbon fiber containing the ultramicro pores, a polyimide fiber is taken as a precursor, afterthe precursor is mixed with activating agent evenly, through thermal treatment under inert atmosphere, polyimide carbon fiber containing the ultramicro pores, with high micro pore volume and large specific area, is prepared, production period is reduced, and energy consumption is reduced.

Description

technical field [0001] The invention relates to the field of preparation and application of porous carbon fibers, in particular to a polyimide-based carbon fiber containing ultramicropores and a preparation method and application thereof. Background technique [0002] With the rapid development of the world economy, the environment in which human beings live and thrive has undergone tremendous changes. Since the Industrial Revolution, massive emissions of carbon dioxide have caused environmental problems such as global warming, sea level rise, and land desertification. "Carbon capture, storage and utilization" technology is an effective means to reduce carbon dioxide emissions. Porous carbon fibers have been applied in the field of carbon dioxide capture due to their advantages such as developed pore structure, high specific surface area, easy to modify chemical surface, and excellent physical and chemical stability. [0003] The capture amount of carbon dioxide is mainly ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F9/24B01J20/20B01J20/30B01J20/28B01D53/02
CPCD01F9/24B01J20/20B01J20/28023B01D53/02B01D2253/102B01D2257/504Y02C20/40
Inventor 王雪飞熊龙张永刚钱鑫
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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