CN110975588A - Preparation method of impregnated activated carbon for removing formaldehyde - Google Patents
Preparation method of impregnated activated carbon for removing formaldehyde Download PDFInfo
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- CN110975588A CN110975588A CN201911328127.5A CN201911328127A CN110975588A CN 110975588 A CN110975588 A CN 110975588A CN 201911328127 A CN201911328127 A CN 201911328127A CN 110975588 A CN110975588 A CN 110975588A
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
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- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/72—Organic compounds not provided for in groups B01D53/48 - B01D53/70, e.g. hydrocarbons
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- B01D2251/106—Peroxides
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
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Abstract
The invention relates to a preparation method of impregnated activated carbon for removing formaldehyde, belonging to the technical field of activated carbon. The invention mainly solves the technical problems of poor formaldehyde adsorption capability, short replacement period, high carbon consumption, easy secondary pollution and the like of the existing formaldehyde-removing activated carbon. The technical scheme of the invention is as follows: a preparation method of impregnated activated carbon for removing formaldehyde, which comprises the following steps: the method comprises the following steps: 1) preparing base carbon; 2) preparing an impregnation liquid; 3) dipping; 4) and drying; 5) and repeating the impregnation and drying. The invention has the advantages of simple preparation method, low production cost, safety, stability, high removal rate of formaldehyde in the air up to more than 92 percent, difficult secondary pollution and the like.
Description
Technical Field
The invention belongs to the technical field of activated carbon, and particularly relates to a preparation method of impregnated activated carbon for removing formaldehyde.
Background
Formaldehyde (I)(HCHO) is a common indoor air pollution, mainly comes from artificial boards of indoor furniture, adhesives taking formaldehyde as a main raw material, and other various decorative materials which contain formaldehyde and can be emitted to the outside. Formaldehyde is a substance with high toxicity, is the second place on the priority control list of toxic chemicals in China, and can reduce the oxidation resistance of each organ of the organism, so that the organ is oxidized and damaged, and the damage is more serious when the concentration is higher. When the concentration of the indoor formaldehyde is more than 0.08m3In time, it can cause red eyes, itchy eyes, discomfort or pain in the throat, hoarseness, sneezing, chest distress, asthma, dermatitis, etc., which are the main causes of many diseases. Long-term inhalation of pregnant women can cause fetal deformity and even death, and long-term inhalation of men can cause sperm deformity and death of men, and can also cause nasal cancer. In response to this situation, various techniques for treating formaldehyde have been developed. The currently used treatment methods can be roughly classified into an ozone oxidation method, an adsorption method, a photocatalytic oxidation method and a metal oxide method, wherein the adsorption method has the advantages of wide raw materials, simple operation, low energy consumption and the like.
At present, the multi-purpose activated carbon for adsorbing formaldehyde in air needs to be replaced regularly so as to avoid saturation adsorption and become a formaldehyde release source to cause secondary pollution, but common activated carbon adsorbs formaldehyde physically, so that the adsorption is unstable and secondary pollution is easy to happen, the formaldehyde adsorption capacity is low, the replacement period is short, and the carbon consumption is high.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, provides a preparation method of impregnated activated carbon for removing formaldehyde, and solves the technical problems of poor formaldehyde adsorption capability, short replacement period, high carbon consumption, easy secondary pollution and the like of the existing activated carbon for removing formaldehyde.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
a preparation method of impregnated activated carbon for removing formaldehyde comprises the following steps:
1) preparing base carbon: selecting coal briquette activated carbon as base carbon, drying to remove water in the coal briquette activated carbon, wherein the drying temperature is 110-120 ℃, and preparing the base carbon for later use; wherein the water capacity of the coal briquette activated carbon is not less than 80 percent;
2) preparing an impregnation liquid: firstly, slowly adding 4-6 parts by weight of potassium hydroxide into 88-90 parts by weight of purified water, and slowly stirring in the process of adding the potassium hydroxide to completely dissolve the potassium hydroxide into the purified water; then, adding 4-7.2 parts by weight of potassium persulfate into the mixed solution, wherein the weight ratio of potassium hydroxide to potassium persulfate is as follows: potassium hydroxide: heating the mixed solution to 60-70 ℃ and stirring the mixed solution to completely dissolve the potassium persulfate; finally, filtering to remove impurities in the mixed solution, and preparing impregnation liquid with the concentration of 8-10% for later use;
3) dipping: weighing the base carbon prepared in the step 1) and the impregnation liquid prepared in the step 2) according to the weight-volume ratio of the solid liquid of 10: 8-10, uniformly spraying the impregnation liquid on the base carbon, and standing the impregnated base carbon for at least 30 minutes;
4) drying: putting the impregnated base carbon prepared in the step 3) into a drying oven for drying treatment, wherein the drying treatment temperature is 110-120 ℃, taking out the base carbon from the drying oven after drying until the weight of the base carbon is constant, and cooling to room temperature in a closed environment;
5) repeating dipping and drying: repeating the step 3) and the step 4) for two to three times, and sealing and packaging to obtain the finished product of the impregnated activated carbon.
Further, in the step 1), the particle size of carbon particles in the base carbon is 8-20 meshes, and the strength value of the base carbon is greater than 90.
Further, the temperature of the impregnating solution sprayed in the step 3) is 50-60 ℃.
Further, the drying treatment time in the step 4) is 4-6 hours.
The invention takes high-quality coal briquette active carbon as base carbon, prepares impregnation liquid by potassium hydroxide and potassium persulfate, and prepares the impregnated active carbon by cooling after repeating the impregnation drying process for multiple times. According to the invention, the activated carbon is chemically modified by a chemical impregnation method, so that active substances are loaded on the porous structure of the activated carbon, indoor formaldehyde can be rapidly captured, and formaldehyde molecules captured in the pore structure are eliminated, so that the formaldehyde adsorption quantity is increased, and the formaldehyde adsorption stability of the activated carbon is improved. The principle of the impregnated activated carbon for removing formaldehyde is as follows: potassium persulfate can oxidize formaldehyde into formic acid or carbon dioxide and water in an alkaline environment. Compared with the prior art, the invention has the advantages of simple preparation method, low production cost, safety, stability, high removal rate of formaldehyde in the air up to more than 92 percent, difficult secondary pollution and the like.
Detailed Description
The present invention will be further described with reference to the following examples.
Example 1
The preparation method of the impregnated activated carbon for removing formaldehyde provided in this embodiment 1 includes the following steps:
1) preparing base carbon: selecting coal briquette active carbon as base carbon, drying to remove water in the coal briquette active carbon, wherein the drying temperature is 110 ℃, and preparing the base carbon for later use; the water capacity of the coal briquette active carbon is 80%, the particle size of carbon particles in the base carbon is 8-20 meshes, and the strength value of the base carbon is 92;
2) preparing an impregnation liquid: firstly, slowly adding 4 parts by weight of potassium hydroxide into 92 parts by weight of purified water, and slowly stirring in the process of adding the potassium hydroxide to completely dissolve the potassium hydroxide into the purified water; then, adding 4 parts by weight of potassium persulfate into the mixed solution, heating the mixed solution to 60 ℃, and stirring the mixed solution to completely dissolve the potassium persulfate; finally, filtering to remove impurities in the mixed solution, and preparing impregnation liquid with the concentration of 8% for later use;
3) dipping: weighing the base carbon prepared in the step 1) and the impregnation liquid prepared in the step 2) according to the weight-to-volume ratio of the solid liquid of 10:8, uniformly spraying the impregnation liquid with the temperature of 50 ℃ onto the base carbon, and standing the impregnated base carbon for 30 minutes;
4) drying: putting the impregnated base carbon prepared in the step 3) into a drying oven at the temperature of 110 ℃ for drying treatment for 4 hours, taking out the base carbon from the drying oven after drying until the weight of the base carbon is constant, and cooling to room temperature in a closed environment;
5) repeating dipping and drying: repeating the step 3) and the step 4) for two times, and sealing and packaging to obtain the impregnated activated carbon finished product.
Through detection, the formaldehyde removal rate of the impregnated activated carbon finished product prepared by the method is 92.3 percent after the impregnated activated carbon finished product is acted for 24 hours at the ambient temperature of (25 +/-2) DEG C and the ambient humidity of (50 +/-10)% RH
Example 2
The preparation method of the impregnated activated carbon for removing formaldehyde provided in this embodiment 2 includes the following steps:
1) preparing base carbon: selecting coal briquette active carbon as base carbon, drying to remove water in the coal briquette active carbon, wherein the drying temperature is 115 ℃, and preparing the base carbon for later use; wherein the water capacity of the coal briquette active carbon is 90 percent, the particle size of carbon particles in the base carbon is 10 meshes, and the strength value of the base carbon is 95;
2) preparing an impregnation liquid: firstly, slowly adding 5 parts by weight of potassium hydroxide into 89 parts by weight of purified water, and slowly stirring in the process of adding the potassium hydroxide to completely dissolve the potassium hydroxide into the purified water; then, adding 6 parts by weight of potassium persulfate into the mixed solution, heating the mixed solution to 65 ℃, and stirring the mixed solution to completely dissolve the potassium persulfate; finally, filtering to remove impurities in the mixed solution, and preparing impregnation liquid with the concentration of 10% for later use;
3) dipping: weighing the base carbon prepared in the step 1) and the impregnation liquid prepared in the step 2) according to the weight-to-volume ratio of the solid liquid of 10:9, uniformly spraying the impregnation liquid with the temperature of 55 ℃ onto the base carbon, and standing the impregnated base carbon for 1 hour;
4) drying: putting the impregnated base carbon prepared in the step 3) into a drying oven at the temperature of 115 ℃ for drying treatment for 5 hours, taking out the base carbon from the drying oven after drying until the weight of the base carbon is constant, and cooling to room temperature in a closed environment;
5) repeating dipping and drying: repeating the step 3) and the step 4) for three times, and sealing and packaging to obtain the impregnated activated carbon finished product.
Through detection, the formaldehyde removal rate of the impregnated activated carbon finished product prepared by the method is 93.1 percent after the impregnated activated carbon finished product is acted for 24 hours at the ambient temperature of (25 +/-2) DEG C and the ambient humidity of (50 +/-10)% RH
Example 3
The preparation method of the impregnated activated carbon for removing formaldehyde provided in this embodiment 3 includes the following steps:
1) preparing base carbon: selecting coal briquette active carbon as base carbon, drying to remove water in the coal briquette active carbon, wherein the drying temperature is 120 ℃, and preparing the base carbon for later use; wherein the water capacity of the coal briquette active carbon is 95 percent, the particle size of carbon particles in the base carbon is 20 meshes, and the strength value of the base carbon is 97;
2) preparing an impregnation liquid: firstly, slowly adding 6 parts by weight of potassium hydroxide into 88 parts by weight of purified water, and slowly stirring in the process of adding the potassium hydroxide to completely dissolve the potassium hydroxide into the purified water; then, adding 6 parts by weight of potassium persulfate into the mixed solution, heating the mixed solution to 70 ℃, and stirring the mixed solution to completely dissolve the potassium persulfate; finally, removing impurities in the mixed solution to prepare impregnation liquid with the concentration of 12% for later use;
3) dipping: weighing the base carbon prepared in the step 1) and the impregnation liquid prepared in the step 2) according to the weight-to-volume ratio of the solid liquid of 10:9.5, uniformly spraying the impregnation liquid with the temperature of 60 ℃ onto the base carbon, and standing the impregnated base carbon for 2 hours;
4) drying: putting the impregnated base carbon prepared in the step 3) into a drying oven at the temperature of 120 ℃ for drying treatment for 6 hours, taking out the base carbon from the drying oven after drying until the weight of the base carbon is constant, and cooling to room temperature in a closed environment;
5) repeating dipping and drying: repeating the step 3) and the step 4 for three times, and sealing and packaging to obtain the finished product of the impregnated activated carbon.
Through detection, the formaldehyde removal rate of the impregnated activated carbon finished product prepared by the method is 93.5% after the impregnated activated carbon finished product is acted for 24 hours at the ambient temperature of (25 +/-2) DEG C and the ambient humidity of (50 +/-10)% RH.
Claims (4)
1. A preparation method of impregnated activated carbon for removing formaldehyde is characterized by comprising the following steps:
1) preparing base carbon: selecting coal briquette activated carbon as base carbon, drying to remove water in the coal briquette activated carbon, wherein the drying temperature is 110-120 ℃, and preparing the base carbon for later use; wherein the water capacity of the coal briquette activated carbon is not less than 80 percent;
2) preparing an impregnation liquid: firstly, slowly adding 4-6 parts by weight of potassium hydroxide into 88-92 parts by weight of purified water, and slowly stirring in the process of adding the potassium hydroxide to completely dissolve the potassium hydroxide into the purified water; then, adding 4-7.2 parts by weight of potassium persulfate into the mixed solution, heating the mixed solution to 60-70 ℃, and stirring the mixed solution to completely dissolve the potassium persulfate; finally, filtering to remove impurities in the mixed solution to prepare impregnation liquid with the concentration of the solid material of 8-12 percent for later use;
3) dipping: weighing the base carbon prepared in the step 1) and the impregnation liquid prepared in the step 2) according to the weight-volume ratio of the solid liquid of 10: 8-10, uniformly spraying the impregnation liquid on the base carbon, and standing the impregnated base carbon for at least 30 minutes;
4) drying: putting the impregnated base carbon prepared in the step 3) into a drying oven for drying treatment, wherein the drying temperature is 110-120 ℃, taking out the base carbon from the drying oven after drying until the weight of the base carbon is constant, and cooling to room temperature in a closed environment;
5) repeating dipping and drying: repeating the step 3) and the step 4) for two to three times, and sealing and packaging to obtain the finished product of the impregnated activated carbon.
2. The method for preparing the formaldehyde-removing impregnated activated carbon according to claim 1, wherein: in the step 1), the particle size of the base carbon particles is 8-20 meshes, and the strength value of the base carbon is greater than 90.
3. The method for preparing the formaldehyde-removing impregnated activated carbon according to claim 1, wherein: the temperature of the impregnating solution sprayed in the step 3) is 50-60 ℃.
4. The method for preparing the formaldehyde-removing impregnated activated carbon according to claim 1, wherein: the drying treatment time in the step 4) is 4-6 hours.
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| CN201911328127.5A CN110975588A (en) | 2019-12-20 | 2019-12-20 | Preparation method of impregnated activated carbon for removing formaldehyde |
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| CN201911328127.5A CN110975588A (en) | 2019-12-20 | 2019-12-20 | Preparation method of impregnated activated carbon for removing formaldehyde |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114984736A (en) * | 2022-05-12 | 2022-09-02 | 惠州市栢诗新材料有限公司 | Application of potassium monopersulfate composite salt in formaldehyde removal preparation |
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| CN101837281A (en) * | 2010-06-04 | 2010-09-22 | 厦门大学 | Method for preparing formaldehyde adsorbent having composite adsorption function |
| CN103977762A (en) * | 2014-05-14 | 2014-08-13 | 广西师范大学 | A modification method of active carbon fiber capable of efficiently removing air pollutants |
| US20180117522A1 (en) * | 2016-11-03 | 2018-05-03 | Columbus Industries, Inc. | Surface-Modified Carbon and Sorbents for Improved Efficiency in Removal of Gaseous Contaminants |
| CN108176415A (en) * | 2016-12-08 | 2018-06-19 | 江苏瑞丰科技实业有限公司 | A kind of air purification raw material of wood-charcoal cleans regenerative use technology |
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2019
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Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2451216Y (en) * | 2000-10-26 | 2001-10-03 | 浙江大学 | Apparatus for absorbing formaldehyde |
| CN101250382A (en) * | 2008-03-27 | 2008-08-27 | 武汉理工大学 | Method for eliminating free formaldehyde in adhesive for machining woodwork by using persulfate |
| CN101837281A (en) * | 2010-06-04 | 2010-09-22 | 厦门大学 | Method for preparing formaldehyde adsorbent having composite adsorption function |
| CN103977762A (en) * | 2014-05-14 | 2014-08-13 | 广西师范大学 | A modification method of active carbon fiber capable of efficiently removing air pollutants |
| US20180117522A1 (en) * | 2016-11-03 | 2018-05-03 | Columbus Industries, Inc. | Surface-Modified Carbon and Sorbents for Improved Efficiency in Removal of Gaseous Contaminants |
| CN108176415A (en) * | 2016-12-08 | 2018-06-19 | 江苏瑞丰科技实业有限公司 | A kind of air purification raw material of wood-charcoal cleans regenerative use technology |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114984736A (en) * | 2022-05-12 | 2022-09-02 | 惠州市栢诗新材料有限公司 | Application of potassium monopersulfate composite salt in formaldehyde removal preparation |
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