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Porous activated carbon fiber adsorbing material of sheath-core composite structure and preparation thereof

A technology of porous activated carbon and adsorption materials, which is applied in the direction of alkali metal compounds, other chemical processes, alkali metal oxides/hydroxides, etc., and can solve the problems affecting the range of use and service life of ACF, strength loss, etc., and achieve a favorable load The effect of biological cells, prolonging the service life, and easy preparation method

Inactive Publication Date: 2010-09-29
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, some breakthroughs have been made in the preparation of macropores. Basically, a pore-enlarging catalyst is added to the raw materials to achieve the purpose of obtaining large pores. Seriously affected the scope and service life of ACF

Method used

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  • Porous activated carbon fiber adsorbing material of sheath-core composite structure and preparation thereof
  • Porous activated carbon fiber adsorbing material of sheath-core composite structure and preparation thereof
  • Porous activated carbon fiber adsorbing material of sheath-core composite structure and preparation thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0027] Viscose-based carbon fibers with a strength of 0.7GPa were placed in 0.1M Na 3 PO 4 The solution was left to stand for 3 hours, and then put into the activation furnace, and water vapor and N 2 , the temperature was raised to 1000°C at a rate of 20°C / min, and water vapor was passed through for constant temperature activation for 0.5 hours. After cooling down to 200°C, the inert gas and water vapor were turned off to prepare a porous activated carbon fiber adsorption material.

[0028] image 3 It is the electron microscope photo of the adsorption material of this embodiment, the pore size on the surface is 50nm2 / g.

Embodiment 2

[0030] Put viscose-based carbon fibers with a strength of 0.7GPa in 0.2M NaH 2 PO 4 Stand in the solution for 2 hours, then put it into the activation furnace, pass water vapor and N 2 , the temperature was raised to 1000°C at a rate of 10°C / min, and water vapor was passed through for constant temperature activation treatment for 1 hour. After cooling down to 200°C, the inert gas and water vapor were turned off to prepare a porous activated carbon fiber adsorption material.

[0031] Figure 4 It is the electron microscope photo of the adsorption material of this embodiment, the pore diameter on the surface is 100nm2 / g.

Embodiment 3

[0033] Viscose-based carbon fibers with a strength of 0.7GPa were placed in 0.1M Na 2 HPO 4 Stand in the solution for 4 hours, then put it into the activation furnace, pass water vapor and N 2 , the temperature was raised to 1000°C at a rate of 10°C / min, and water vapor was passed through for constant temperature activation for 0.5 hours. After cooling down to 200°C, the inert gas and water vapor were turned off to prepare a porous activated carbon fiber adsorption material.

[0034] Figure 5 It is the electron micrograph of the adsorption material of this embodiment, the pore diameter on the surface is 50nm2 / g.

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Abstract

The invention relates to a porous activated carbon fiber adsorbing material of a sheath-core composite structure and preparation thereof. The structure of the porous activated carbon fiber adsorbing material is as follows: a surface layer is made of macro-porous carbon fiber, and a core layer is made of non-porous carbon fiber; wherein the ratio of the cross-sectional area of the surface layer is controlled to be 10-40 percent, and the cross-section thereof is uniformly provided holes. The preparation comprises the following steps: (1) impregnating carbon fiber in aqueous solution of sodium salt for 2-4 hours, and then placing the carbon fiber in an activation furnace; (2) heating to 800-1100 DEG C under the protection of an inert gas, adding steam, and carrying out constant-temperature activation for 0.5-2 hour(s); and (3) reducing the temperature to be below 200 DEG C, and cutting off the inert gas and the steam, thereby preparing the porous activated carbon fiber adsorbing material. The strength of the adsorbing material provided by the invention is up to 0.3-0.6Gpa, and the surface layer thereof is of a porous structure, thereby not only prolonging the service life of the material, but also facilitating the loading of large-sized molecules such as biological cells and the like; and the preparation method can be controlled easily, the activation process is simple, and the invention is suitable for large-scale production.

Description

technical field [0001] The invention belongs to the field of activated carbon fiber adsorption material and its preparation, in particular to a porous activated carbon fiber adsorption material with skin-core composite structure and its preparation. Background technique [0002] Activated carbon fiber (ACF), also known as fibrous activated carbon, is a high-efficiency active adsorption material and environmental protection engineering material with better performance than activated carbon. More than 50% of its carbon atoms are located on the inner and outer surfaces, forming a unique adsorption structure, which is called surface solid. It is made of fibrous precursors activated by carbonization through a certain procedure. The more developed specific surface area and narrow pore size distribution make it have faster adsorption and desorption speed and larger adsorption capacity, and because it can be easily processed into different shapes such as felt, cloth, paper, etc., a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20B01J20/30B01J20/28
Inventor 吴琪琳严成王光学石彦平韩浩
Owner DONGHUA UNIV
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