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PAN (Polyacrylonitrile)-based porous carbon nanofiber for removing NOx from air, and preparation method and application thereof

A technology of carbon nanofibers and nanofibers, applied in the field of porous PAN-based carbon nanofibers and their preparation and application, capable of solving problems such as polyacrylonitrile-based carbon nanofibers that have not been seen

Active Publication Date: 2012-06-27
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But so far, there is no research on the application of polyacrylonitrile-based carbon nanofibers to remove low-concentration NO

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] A method for preparing PAN-based porous carbon nanofibers for removing NOx in the air, utilizing electrospinning technology, comprising the following steps:

[0020] Step 1, adding magnesium acetate and polyacrylonitrile to N,N-dimethylformamide in a mass ratio of 1:9, and configuring a solution with a total concentration of magnesium acetate-polyacrylonitrile of 10% by weight;

[0021] Step 2, under the condition that the spinning voltage is 20kV and the feeding speed is 1ml / h, the above solution is spun into nanofibers;

[0022] Step 3, preoxidizing the above nanofibers at 260°C for 1 hour, and then carbonizing them at 800°C to obtain PAN-based carbon nanofibers;

[0023] Step 4, washing the above-mentioned carbon nanofibers with hydrochloric acid with a mass concentration of 8 wt% to remove the magnesium oxide therein, then washing with distilled water until neutral, and then vacuum-drying at 80° C. for 24 hours to obtain PAN-based porous carbon nanofibers, The morp...

Embodiment 2

[0027] A method for preparing PAN-based porous carbon nanofibers for removing NOx in the air, utilizing electrospinning technology, comprising the following steps:

[0028] Step 1, adding magnesium acetate and polyacrylonitrile to N, N-dimethylformamide in a mass ratio of 3:7, and configuring a solution with a total concentration of magnesium acetate-polyacrylonitrile of 10 wt %;

[0029] Step 2, under the condition that the spinning voltage is 25kV and the liquid feeding speed is 1ml / h, the above solution is spun into nanofibers;

[0030] Step 3, pre-oxidizing the above-mentioned nanofibers at 280°C for 2 hours, and then carbonizing them at 850°C to obtain PAN-based carbon nanofibers;

[0031] Step 4, washing the above-mentioned carbon nanofibers with hydrochloric acid with a mass concentration of 10 wt% to remove the magnesium oxide therein, then washing with distilled water until neutral, and then vacuum-drying at 80° C. for 24 hours to obtain PAN-based porous carbon nanofi...

Embodiment 3

[0035] A method for preparing PAN-based porous carbon nanofibers for removing NOx in the air, utilizing electrospinning technology, comprising the following steps:

[0036] Step 1, adding magnesium acetate and polyacrylonitrile to N, N-dimethylformamide in a mass ratio of 5:5, and configuring a solution with a total concentration of magnesium acetate-polyacrylonitrile of 15% by weight;

[0037] Step 2, under the condition that the spinning voltage is 20kV and the feeding speed is 1ml / h, the above solution is spun into nanofibers;

[0038]Step 3, preoxidizing the above nanofibers at 270°C for 2 hours, and then carbonizing them at 850°C to obtain PAN-based carbon nanofibers;

[0039] Step 4, washing the above-mentioned carbon nanofibers with hydrochloric acid with a mass concentration of 10 wt% to remove the magnesium oxide therein, then washing with distilled water until neutral, and then vacuum-drying at 80° C. for 24 hours to obtain PAN-based porous carbon nanofibers, The mo...

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Abstract

The invention relates to a PAN (Polyacrylonitrile)-based porous carbon nanofiber for removing NOx from air. The PAN-based porous carbon nanofiber has the diameter range of 50-1000 nm, the specific surface area of 200-1200 m<2> / g, a micropore-based porous structure and the micropore volume of 0.3-1.0 cm<3> / g. The PAN-based porous carbon nanofiber can remove the low-concentration NOx from air at room temperature through flowing air containing the low-concentration NOx through the PAN-based porous carbon nanofiber, wherein the low-concentration NOx means the concentration, less than 50 ppm, of NO in air, and in order to ensure a removal effect, the flow velocity of the air containing the low-concentration NOx is 100-400 SCCM, and the reaction temperature is the room temperature. The invention further provides a preparation method of the PAN-based porous carbon nanofiber, and the preparation method is simple and controllable in process.

Description

technical field [0001] The invention belongs to the technical field of air pollution control, and relates to a porous PAN-based carbon nanofiber used for removing NOx in the air and its preparation and application. Background technique [0002] NOx is the general term for nitrogen nitrides, including NO, NO 2 , N 2 O, etc., most of the NOx in the atmosphere is NO, up to 95%, NO 2 The content is very small. The sources of NOx mainly include stationary sources such as coal-fired power plants and mobile sources such as vehicle exhaust. In recent years, with the rapid development of my country's economy and the improvement of people's living requirements, the number of urban vehicles has increased sharply. Although strict regulations have been promulgated and efficient exhaust gas purification technologies have been adopted, the exhaust gas emitted by vehicles has become more and more serious to the environment. The concentration of nitrogen oxides in the air of some large c...

Claims

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Application Information

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IPC IPC(8): D01F9/22D01F11/12B01J21/18B01J20/20B01D53/56B01D53/86B01D53/94
Inventor 黄正宏王明玺康飞宇
Owner TSINGHUA UNIV
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