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Preparation method of macropore activated carbon fiber with intensity more than 0.3GPa

A technology of activated carbon fiber and carbon fiber, applied in chemical instruments and methods, alkali metal oxides/hydroxides, inorganic chemistry, etc., can solve problems such as low strength, affecting the range of use and service life of ACF, and achieve high product strength, The effect of high strength and simple activation process

Inactive Publication Date: 2010-09-08
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Too low strength also seriously affects the scope and service life of ACF

Method used

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  • Preparation method of macropore activated carbon fiber with intensity more than 0.3GPa
  • Preparation method of macropore activated carbon fiber with intensity more than 0.3GPa
  • Preparation method of macropore activated carbon fiber with intensity more than 0.3GPa

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Step 1. Mix the phosphoric acid aqueous solution with a concentration of 10wt% and the aqueous sodium chloride solution with a concentration of 0.5mol / L at a volume ratio of 1:1, and then impregnate the viscose-based carbon fiber with a strength of 0.7GPa for 24 hours. Dry at 100°C;

[0023] Step 2. Put it into an activation furnace, heat it to 1000°C at a rate of 20°C / min under the protection of nitrogen, keep the temperature at a constant temperature for 0.5 hours, and cool to room temperature to obtain macroporous activated carbon fibers with a strength greater than 0.3GPa. Among them, heat to 600 After the temperature is lowered to 200°C, water vapor is introduced, and during the cooling process, when the temperature drops to 200°C, the nitrogen and water vapor are turned off. It can be seen that the surface of the obtained macroporous activated carbon fiber is covered with macropores (100nm

Embodiment 2

[0025] Step 1. Mix the mixed aqueous solution of nitric acid and sulfuric acid with a concentration of 15wt% and the aqueous mixture of disodium hydrogen phosphate and sodium nitrate with a saturated concentration of 1:1 by volume, and then impregnate the viscose-based carbon fiber with a strength of 0.5GPa Among them, 12 hours, after taking it out, dry it at 100°C;

[0026] Step 2. Put it in an activation furnace, heat it to 900°C at a rate of 10°C / min under the protection of helium, keep the temperature at a constant temperature for 0.5 hours, and cool to room temperature to obtain macroporous activated carbon fibers with a strength greater than 0.3GPa. Activated carbon fibers are heated to Water vapor is introduced after 600°C, and during the cooling process, when the temperature drops to 200°C, helium and water vapor are turned off. It can be seen that the surface of the obtained macroporous activated carbon fiber is covered with macropores (200nm

Embodiment 3

[0028] Step 1. Mix hydrochloric acid with a concentration of 20wt% and 2mol / L sodium dihydrogen phosphate aqueous solution at a volume ratio of 1:1, and then impregnate the viscose-based carbon fiber with a strength of 0.6GPa for 12 hours, take it out and place it at 100°C drying;

[0029] Step 2. Put it into an activation furnace, heat it to 900°C at a rate of 15°C / min under the protection of argon, keep the temperature constant for 1 hour, and cool to room temperature to obtain a macroporous activated carbon fiber with a strength greater than 0.3GPa Activated carbon fiber, wherein, heated to Water vapor was introduced after 600°C, and during the cooling process, when the temperature dropped to 200°C, the argon and water vapor were turned off. It can be seen from the electron micrograph (Fig. 3) that the surface of the obtained macroporous activated carbon fiber is covered with macropores (50nm

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Abstract

The invention provides a preparation method of a macropore activated carbon fiber, the strength of which is larger than 0.3 GPa. The preparation method comprises the following steps: a carbon fiber is soaked in mixed aqueous solution of sodium salt and acid for 12-24 hours, and dried under 100 DEG C after being taken out; then, the carbon fiber is put into an activation furnace, and heated to 800-1100 DEG C under the protection of inert gases; at the same time, vapour is introduced to activate the fiber for 0.5-1 hour. The strength of the obtained activated carbon fiber can reach 0.3-0.5 GPa,and the service life of the activated carbon fiber can be prolonged; the aperture of macropores on the surface of the obtained activated carbon fiber is 50-600 nm, thereby favoring the absorption of materials of large sizes. The preparation method directly utilizes the carbon fiber as the raw material, the activation process is simple, and the product strength is higher.

Description

technical field [0001] The invention relates to a preparation method of a macroporous activated carbon fiber with a strength greater than 0.3GPa. Background technique [0002] The different pore sizes on the surface of activated carbon fiber (ACF) can endow the activated carbon fiber with different adsorption properties. Most of the ACFs currently developed and produced are microporous ACFs with a pore size below 2nm, which are only suitable for the adsorption of gases and small molecular weight liquid molecules. For the adsorption of large-scale substances with a size of tens to hundreds of nm, the surface of ACF needs to have macropores with a pore size larger than 50 nm. [0003] At present, there have been breakthroughs in the preparation of macropores, basically adding a pore-enlarging catalyst to the raw materials to achieve the purpose of obtaining macropores. However, ACF still has the problem of low strength, especially the generation of large pores is more likely...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/20B01J20/28B01J20/30C01B31/12
Inventor 吴琪琳严成蔡则田荣海琴潘宁潘鼎
Owner DONGHUA UNIV
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