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Method for preparing active carbon fibers by utilizing hydrogen peroxide intensified water vapor to activate

A technology for water vapor activation and preparation of activated carbon, applied in the field of materials, can solve problems such as adsorption of unfavorable polar organic gases, high energy consumption and cost, and achieve the effects of shortening activation time, convenient use and wide application prospects

Inactive Publication Date: 2015-04-08
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, higher temperature and longer activation time not only bring higher energy consumption and cost, but also reduce the functional groups on the surface of activated carbon fibers, which is not conducive to the adsorption of polar organic gases.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Under the protection of nitrogen, the PAN-based pre-oxidized fiber cloth was heated to 900°C at a rate of 5°C / min, and activated by passing through the activator for 1 hour. After the activation was completed, the hydrogen peroxide was stopped, and the activation furnace was cooled to room temperature under a nitrogen atmosphere to obtain activated carbon fibers. cloth.

[0021] In this implementation case, the activator is water vapor containing hydrogen peroxide, the concentration of the hydrogen peroxide aqueous solution is 3%, the volume ratio of water vapor and nitrogen is 1 / 2, and the flow rate of the activator is 150 mL / min. The specific surface area of ​​the obtained activated carbon fiber is 1150m 2 / g, nitrogen content 4.9%, oxygen content 8.6%.

Embodiment 2

[0023] Compared with Example 1, the difference is only that in this comparative example the concentration of aqueous hydrogen peroxide solution in the activator is 1%, the volume ratio of water vapor and nitrogen is 1 / 2, and the flow rate of the activator is 150mL / min. The specific surface area of ​​the obtained activated carbon fiber is 992m 2 / g, nitrogen content 5.1%, oxygen content 7.8%.

Embodiment 3

[0025] Under the protection of nitrogen, the asphalt preoxidized fiber cloth was heated up to 900°C at a rate of 5°C / min, and activated by passing through the activator for 1 hour. After the activation, the hydrogen peroxide was stopped, and the activation furnace was cooled to room temperature under a nitrogen atmosphere to obtain activated carbon fibers.

[0026] In this embodiment, the activator is water vapor containing hydrogen peroxide, the concentration of hydrogen peroxide aqueous solution is 1%, the volume ratio of water vapor and nitrogen is 1 / 2, and the flow rate of the activator is 150 mL / min. The specific surface area of ​​the obtained activated carbon fiber is 901m 2 / g oxygen content 6.4%.

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Abstract

The invention provides a method for preparing active carbon fibers with high specific surface area and abundant surface functional groups by utilizing hydrogen peroxide intensified water vapor to activate. The method comprises the following steps: heating polymer fibers or pre-oxidation polymer fibers in an inert atmosphere for 800-950 DEG C; and introducing the water vapor containing hydrogen peroxide to activate to prepare the active carbon fibers with the high specific surface area and the abundant surface functional groups. The method has the characteristics of simple preparation process, less environment pollution, low energy consumption and the like, and has a higher actual application value.

Description

technical field [0001] The invention belongs to the technical field of materials and relates to an activated carbon fiber, in particular to a method for preparing the activated carbon fiber by using hydrogen peroxide to strengthen water vapor activation. Background technique [0002] Activated carbon fiber is a new, efficient and multifunctional adsorption material developed in the 1970s. It is the third generation of porous carbon material after powdered activated carbon and granular activated carbon. It is made of carbon fiber and carbonizable fiber after physical activation, chemical It is prepared by activation or a combination of both. It has a rich and developed pore structure and has great application prospects in environmental protection fields such as desulfurization, denitrification, and organic gas adsorption. In particular, PAN-based activated carbon fibers, compared with activated carbon fibers made from other precursors (phenolic-based, pitch-based), have the a...

Claims

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Application Information

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IPC IPC(8): D01F9/24D01F9/16D01F9/22D01F9/145D01F11/12
Inventor 黄正宏徐强康飞宇
Owner TSINGHUA UNIV
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