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Process for preparing big aperture active carbon fibers

A technology of activated carbon fiber and large pore size, applied in the chemical characteristics of fibers, textiles and papermaking, etc., can solve the problems of no adsorption effect, poor adsorption effect, etc., and achieve the effect of appropriate strength and expansion of the application range.

Inactive Publication Date: 2005-06-29
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For substances with larger molecules, such as macromolecular dyes, polymers, bacteria and viruses, dust, etc., the diameter reaches tens to hundreds of nanometers, and the microporous and mesopore activated carbon fibers have almost no or poor adsorption effect.
For these macromolecular substances, the activated carbon fiber needs to have a larger pore size to have an adsorption effect, and the activated carbon fiber with a large pore size (the pore size is greater than 50 nanometers) has not been reported in the literature or produced.

Method used

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  • Process for preparing big aperture active carbon fibers
  • Process for preparing big aperture active carbon fibers
  • Process for preparing big aperture active carbon fibers

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Immerse the viscose fiber in an aqueous solution containing 1% sodium sulfate, 5% ammonium hydrogen phosphate, and 0.2% ferric chloride for 15 minutes, take it out, and squeeze dry to remove excess solution. After the fiber is dried at 90°C, it is placed in an electric furnace, heated and oxidized in the air below 250°C for 110 minutes, gradually heated and carbonized in nitrogen at 300°C-900°C for 150 minutes, and activated in water vapor at 1050°C for 35 minutes. Then, it was naturally cooled to room temperature in nitrogen, and fully washed with dilute hydrochloric acid and water to obtain the above-mentioned macroporous activated carbon fiber.

Embodiment 2

[0022] Immerse the viscose fiber in an aqueous solution containing 2% sodium sulfate, 3.5% ammonium hydrogen phosphate, and 1.5% ferric chloride for 35 minutes, take it out, and squeeze dry to remove excess solution. After the fiber is dried at 120°C, it is placed in an electric furnace, heated and oxidized in the air at 240°C for 80 minutes, gradually heated and carbonized in nitrogen at 280°C-850°C for 100 minutes, and activated step by step in water vapor at 850°C for 80 minutes. Then, it was naturally cooled to room temperature in nitrogen, and fully washed with dilute hydrochloric acid and water to obtain the above-mentioned macroporous activated carbon fiber.

Embodiment 3

[0024] Immerse the viscose fiber in an aqueous solution containing 3% sodium sulfate, 1.5% ammonium hydrogen phosphate, and 2.5% ferric chloride for 15 minutes, take it out, and squeeze dry to remove excess solution. After the fiber is dried at 150°C, it is placed in an electric furnace, heated and oxidized in air below 260°C for 50 minutes, gradually heated and carbonized in nitrogen below 1000°C for 70 minutes, and activated step by step in water vapor at 1000°C for 40 minutes. Then, it was naturally cooled to room temperature in nitrogen, and fully washed with dilute hydrochloric acid and water to obtain the above-mentioned macroporous activated carbon fiber.

[0025] In Examples 4 to 6, 3.5% ammonium hydrogen phosphate and 1%, 1.5%, and 2.5% potassium sulfate were respectively added to the catalyst aqueous solution of viscose fiber, and the rest of the process conditions were unchanged to obtain the above-mentioned activated carbon fiber with large aperture.

[0026] Appli...

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Abstract

The invention belongs to the field of material preparation and relates to a preparation method of activated carbon fibers with large apertures. In the present invention, the fiber raw material is pretreated by impregnating the catalyst aqueous solution, and then dried, oxidized, carbonized, activated, and washed in sequence to obtain activated carbon fibers with large pores; the feature is that the catalyst is sulfuric acid, phosphoric acid, boric acid or hydrochloric acid Any two or three of potassium salts, sodium salts, ammonium salts, cobalt salts, nickel salts, and iron salts, the amount of the catalyst is 1-10% by weight of the raw materials; the impregnation time of the catalyst aqueous solution is 5-60 minutes. The surface pore diameter of the prepared fiber is greater than 50 nanometers, and the specific surface area reaches 800-1800m2 / g. The material prepared by the method of the present invention is soft and has appropriate strength, and can be used for masks, protective clothing, filter sheets and equipment, etc., and can also be used for virus and chemical protection, as well as industries such as chemical industry, environmental protection, pharmaceuticals, hygiene, and electronics.

Description

Technical field: [0001] The invention belongs to the field of material preparation and relates to a preparation method of macroporous activated carbon fibers. The material can be used for virus and chemical protection, as well as chemical industry, environmental protection, pharmaceutical, health, electronics and other industries. Background technique: [0002] Activated carbon fiber is an efficient adsorption functional material, which mainly relies on a large number of micropores on its surface to generate adsorption. It has been widely used in chemical separation, air purification, health protection and other fields. The existing activated carbon fibers on the market are all microporous, and the pore diameters are concentrated in the range of 0.8 to 2 nanometers, such as Chinese patent CN1354292A. Chinese patent CN1150607 reports a method for preparing activated carbon fibers with mesopores, and the pore diameters are concentrated in the range of 5 to 10 nanometers. Si...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F9/14
Inventor 曾凡龙潘鼎陈惠芳刘占莲吕永根李包顺荣海琴
Owner DONGHUA UNIV
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