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A kind of preparation method of high specific surface area microporous activated carbon nanofiber

A technology of high specific surface area and nanofibers, which is applied in the field of preparation of microporous activated carbon nanofibers with high specific surface area, can solve the problems of high energy consumption, carbonization, and long activation steps, etc., and achieve large specific surface area, rich micropores, and adsorption highly selective effect

Inactive Publication Date: 2016-05-18
TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In CN102505403A "A Preparation Method of Activated Carbon Fiber Membrane with Hierarchical Pore Structure", a polyacrylonitrile membrane is prepared by dispersing the high and medium pore activated carbon material into a polyacrylonitrile organic solvent by electrospinning, and then pre-oxidized, Activated carbon fiber with hierarchical pore structure was prepared by carbonization and carbon dioxide activation treatment. This invention used electrospinning technology in the preparation process of activated carbon fiber precursor fiber, but the subsequent carbonization and activation process is still the traditional preparation process. Carbonization, activation The step time is too long and the energy consumption is high
There is no public report on the preparation of activated carbon fibers by blending and spinning polyacrylonitrile and activator by electrospinning, followed by carbonization and activation

Method used

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  • A kind of preparation method of high specific surface area microporous activated carbon nanofiber

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Add 1 weight part of polyacrylonitrile raw material and 0.5 weight part of zinc chloride into 10 weight parts of N, N-dimethylacetamide solvent, fully stir and disperse to obtain the electrospinning stock solution;

[0020] Perform electrospinning on some electrospinning stock solution electrospinning equipment to obtain nanofibers (precursor nanofibers). The electrospinning parameters are: spinning needle G30, spinning voltage 10kV, and spinning distance 10cm; The fibers were placed in a tube furnace, and the temperature was slowly raised to 250°C, and kept for 1 hour, then nitrogen gas was introduced, and the temperature was continued to rise to 600°C at a rate of 10°C per minute, and kept for 1 hour; after that, the heating of the tube furnace was stopped, and the temperature was lowered to After room temperature, the product was taken out for washing and drying to finally obtain microporous activated carbon nanofibers with high specific surface area. like figure 1 ...

Embodiment 2

[0022] Add 1 weight part of polyacrylonitrile and 0.2 weight part of sodium hydroxide to 8 weight parts of N,N-dimethylformamide solvent, stir and disperse fully to obtain an electrospinning stock solution;

[0023] Conduct electrospinning on some electrospinning stock solution electrospinning equipment to obtain nanofibers (precursor nanofibers); place the precursor nanofibers in a tube furnace, slowly raise the temperature to 220 ° C, keep for 2 hours, and then pass through Nitrogen, continue to heat up to 500 degrees at a rate of 5 degrees per minute, and keep it for 3 hours; then stop heating the tube furnace, and after cooling down to room temperature, take out the product for washing and drying, and finally produce high specific surface area microporous activated carbon nanofibers .

Embodiment 3

[0025] Add 1 part by weight of polyacrylonitrile, 0.15 parts by weight of sodium hydroxide and 0.15 parts by weight of zinc bromide to 12 parts by weight of N,N-dimethylformamide solvent, stir and disperse fully to obtain an electrospinning stock solution ;

[0026] Conduct electrospinning on some electrospinning stock solution electrospinning equipment to obtain nanofibers (precursor nanofibers); place the precursor nanofibers in a tube furnace, slowly raise the temperature to 220 ° C, keep for 2 hours, and then pass through Nitrogen, continue to heat up to 600 degrees at a rate of 8 degrees per minute, and keep it for 1.5 hours; then stop heating the tube furnace, and after cooling down to room temperature, take out the product for washing and drying, and finally produce high specific surface area microporous activated carbon nanofibers .

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Abstract

The invention relates to a preparation method of high-specific surface area micropore active carbon nano fibers. The preparation method is characterized by comprising the specific steps of adding a defined amount of polyacrylonitrile powder and an activating agent in a high-polarity organic solvent, fully stirring and uniformly mixing to prepare an electrostatic spinning solution, then spinning the electrostatic spinning solution on an electrostatic spinning device to obtain nano fiber precursors; and carrying out steps of pre-oxidation, high-temperature carbonization and activation, and washing and drying on the nano fiber precursors to prepare the active nano fibers. The active nano fibers have the advantages of simple preparation process, low cost, uniform sample fiber diameter, large specific surface area, small pore diameter distribution and the like. The novel active carbon nano fibers prepared by adopting the preparation method can be widely applied to the treatment of pollutants, the separation of a mixture, an electrode material, and the like, and is wide in application prospect.

Description

technical field [0001] The invention relates to the technical field of porous nanofiber materials, in particular to a preparation method of microporous activated carbon nanofibers with high specific surface area. Background technique [0002] Activated carbon fiber is the third-generation activated carbon material developed after powder activated carbon and granular activated carbon. Therefore, since the advent of activated carbon fiber in the 1970s, it has been widely used in food, medical, environmental protection, textile, nuclear energy and other industries. At present, the precursors for preparing activated carbon fibers mainly include viscose fiber, phenolic-based fiber, polyacrylonitrile fiber, pitch-based fiber, polyvinyl alcohol-based fiber, styrene / olefin copolymer fiber and wood-based fiber, etc., which are mainly used in industry. The first four. [0003] The most significant advantage of polyacrylonitrile (PAN) fiber is that it contains nitrogen in its structu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D01F9/22
Inventor 赵阳肖红梅渠成兵付绍云
Owner TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI