Modified activated carbon for purifying formaldehyde and preparation method thereof

A technology of activated carbon and modification, which is applied in chemical instruments and methods, separation methods, and other chemical processes. It can solve the problems of application range and scene limitations, secondary air pollution, and low photocatalytic efficiency, so as to avoid safety problems. , Improve purification efficiency, long-term purification effect

Pending Publication Date: 2020-04-17
EAST CHINA UNIV OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Just like other adsorption materials, when activated carbon adsorption is in a state of adsorption saturation, it no longer has the ability to adsorb and purify. In addition, activated carbon adsorption is generally physical adsorption, and the adsorption force is weak. Under certain conditions (such as low formaldehyde concentration in the air) When the temperature rises, the desorption process of the adsorbed formaldehyde will occur, and the adsorbed formaldehyde will be released into the indoor air again, causing secondary pollution of the air.
Using an oxidizing agent, when the gaseous formaldehyde is in contact with the oxidizing agent, the formaldehyde molecule will undergo an oxidation reaction, thereby achieving the effect of chemically degrading formaldehyde. However, the oxidizing agent is often accompanied by problems such as corrosiveness, flammability, and pollution, which make its application scope and scene obviously restricted
At present, some air purifiers (purification liquid) products for removing formaldehyde appear on the market. By

Method used

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  • Modified activated carbon for purifying formaldehyde and preparation method thereof
  • Modified activated carbon for purifying formaldehyde and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0029] The present embodiment 1 provides a modified activated carbon for purifying formaldehyde and a preparation method thereof, comprising the following steps:

[0030] (1) Dry the coconut shell granular activated carbon at 160°C for 8 hours, and cool it in a desiccator for use;

[0031] (2) preparation mass concentration is the sodium hypochlorite solution of 0.5%;

[0032] (3) preparing a 2-imidazolidinone solution with a mass concentration of 2.0%;

[0033] (4) The sodium hypochlorite solution of step (2) is fully mixed with the activated carbon after drying by equal volume impregnation method, dried at room temperature for 36 hours, and dried in vacuum;

[0034] (5) The sodium hypochlorite modified activated carbon obtained in step (4) was then used for equal volume impregnation modification with the 2-imidazolidinone solution of (3), dried at room temperature for 60 hours, and dried in vacuum.

Embodiment 2

[0036] The present embodiment 2 provides a modified activated carbon for purifying formaldehyde and a preparation method thereof, comprising the following steps:

[0037] (1) Dry coconut shell granular activated carbon at 150°C for 10 hours, and cool it in a desiccator for use;

[0038] (2) preparation mass concentration is the sodium chlorate solution of 0.3%;

[0039] (3) preparation mass concentration is the ethylenediamine solution of 1.5%;

[0040] (4) the sodium chlorate solution of step (2) is fully mixed with the gac after drying by equal-volume impregnation method, dried at room temperature for 32 hours, and vacuum-dried;

[0041] (5) The sodium chlorate-modified activated carbon prepared in step (4) was impregnated with the ethylenediamine solution of (3) for equal volume modification, dried at room temperature for 55 hours, and vacuum-dried.

Embodiment 3

[0043] Present embodiment 3 provides a kind of preparation method of the modified activated carbon of purification formaldehyde, comprises the steps:

[0044] (1) Dry the coconut shell granular activated carbon at 170°C for 6 hours, and cool it in a desiccator for use;

[0045] (2) preparation mass concentration is the hydrogen peroxide solution of 1.0%;

[0046] (3) preparation mass concentration is the diethylamine solution of 4.0%;

[0047] (4) The hydrogen peroxide solution of step (2) is fully mixed with the activated carbon after drying by an equal-volume impregnation method, dried at room temperature for 42 hours, and vacuum-dried;

[0048] (5) The activated carbon modified by hydrogen peroxide obtained in step (4) was impregnated with an equal volume of the ethylenediamine solution of (3) for modification, dried at room temperature for 55 hours, and dried in vacuum.

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Abstract

The invention relates to modified activated carbon for purifying formaldehyde and a preparation method thereof. A certain amount of an oxidizing agent and a nucleophilic addition agent are used for modifying the activated carbon according to a certain proportion through a specific process; the oxidation-reduction reaction of the oxidizing agent and formaldehyde, the addition reaction of the nucleophilic addition agent and formaldehyde and the physical adsorption of activated carbon are organically combined, so that formaldehyde in the air is quickly adsorbed on the activated carbon and is converted into substances harmless to a human body through chemical action, and the purpose of thoroughly purifying formaldehyde is achieved. The preparation method of the modified activated carbon purification material is simple and easy to operate, and experimental test results show that the prepared modified activated carbon purification material has adsorption and chemical conversion effects on formaldehyde gas and has the purification characteristics of rapidness, high efficiency, long effect and the like.

Description

technical field [0001] The invention relates to the technical field of modified activated carbon production, in particular to a modified activated carbon for purifying formaldehyde and a preparation method thereof. Background technique [0002] With the continuous improvement of people's living standards, the demand for newly purchased houses and the renovation of old houses has become more and more vigorous, and the demand for decoration and decoration has been continuously improved. While interior decoration improves people's living conditions, the problem of indoor air pollution caused by paints, coatings, panels and other decorative materials and furniture also follows. [0003] It is generally believed that the content of indoor air pollutants is 5 to 10 times higher than that of outdoors, and there are more than 500 kinds of indoor air pollutants that can be detected, many of which can cause cancer and teratogenicity. Common and harmful indoor air pollutants mainly in...

Claims

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Application Information

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IPC IPC(8): B01J20/20B01J20/30B01D53/81B01D53/72B01D53/02
CPCB01J20/20B01D53/81B01D53/72B01D53/02B01D2257/70
Inventor 朱鸣凡胡旺光李秀春廖春鑫陈爱平李春忠
Owner EAST CHINA UNIV OF SCI & TECH
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