CN113244884A - Modified activated carbon for purifying VOCs (volatile organic compounds) and preparation method thereof - Google Patents
Modified activated carbon for purifying VOCs (volatile organic compounds) and preparation method thereof Download PDFInfo
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- CN113244884A CN113244884A CN202110442040.1A CN202110442040A CN113244884A CN 113244884 A CN113244884 A CN 113244884A CN 202110442040 A CN202110442040 A CN 202110442040A CN 113244884 A CN113244884 A CN 113244884A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
- B01J20/20—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising free carbon; comprising carbon obtained by carbonising processes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- 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
- B01D53/02—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 by adsorption, e.g. preparative gas chromatography
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2253/00—Adsorbents used in seperation treatment of gases and vapours
- B01D2253/10—Inorganic adsorbents
- B01D2253/102—Carbon
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/70—Organic compounds not provided for in groups B01D2257/00 - B01D2257/602
- B01D2257/708—Volatile organic compounds V.O.C.'s
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J2220/00—Aspects relating to sorbent materials
- B01J2220/40—Aspects relating to the composition of sorbent or filter aid materials
- B01J2220/48—Sorbents characterised by the starting material used for their preparation
- B01J2220/4806—Sorbents characterised by the starting material used for their preparation the starting material being of inorganic character
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J2220/00—Aspects relating to sorbent materials
- B01J2220/40—Aspects relating to the composition of sorbent or filter aid materials
- B01J2220/48—Sorbents characterised by the starting material used for their preparation
- B01J2220/4812—Sorbents characterised by the starting material used for their preparation the starting material being of organic character
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- Solid-Sorbent Or Filter-Aiding Compositions (AREA)
Abstract
The invention discloses a preparation method of modified activated carbon, which comprises the following steps: (1) mixing activated carbon and an activating agent, and reacting for 1-2 hours at 1000-1200 ℃ under the protection of inert gas; (2) after the reaction, fully washing with clear water; (3) mixing the modifier 1 with the washed activated carbon, fully mixing at the temperature of 60-80 ℃, reacting for 18-24 hours, and fully washing with clear water; (4) reacting the active carbon treated in the step (3) with a modifier 2 for 3-6 hours, and then fully washing with clear water; (5) after drying, soaking in an alcohol solution for 2-6 h, and drying; the activating agent is alkali, the modifying agent 1 is at least one of phosphoric acid, peroxide and persulfate, and the modifying agent 2 is an organic solution. The preparation method can obviously improve the adsorption effect of the activated carbon on the VOCs.
Description
Technical Field
The invention relates to an organic modified activated carbon material, a preparation method and application thereof, and belongs to the technical field of material preparation. .
Background
VOCs (volatile organic compounds) are various organic compounds having a boiling point of 50 ℃ to 260 ℃ at normal temperature. In China, VOCs refer to organic compounds with saturated vapor pressure of more than 70Pa at normal temperature and boiling point of below 260 ℃ at normal pressure, or all organic compounds with vapor pressure of more than or equal to 10Pa and volatility at 20 ℃.
Generally, they are classified into non-methane hydrocarbons (NMHCs), oxygen-containing organic compounds, halogenated hydrocarbons, nitrogen-containing organic compounds, sulfur-containing organic compounds, and the like. VOCs participate in the formation of ozone and secondary aerosols in the atmospheric environment, which have important effects on regional atmospheric ozone pollution and PM2.5 pollution. Most VOCs have unpleasant special odor and have toxic, irritant, teratogenic and carcinogenic effects, and particularly benzene, toluene, formaldehyde and the like cause great harm to human health. VOCs are important precursors causing urban dust haze and photochemical smog and mainly come from the processes of coal chemical industry, petrochemical industry, fuel coating manufacturing, solvent manufacturing and using and the like. Adsorption is a common technique for treating VOCs. At present, the adsorption efficiency of the existing activated carbon adsorption means is low, and the response requirement cannot be met. Therefore, the invention of the activated carbon with better adsorption effect has very important significance.
Disclosure of Invention
The invention aims to provide a preparation method of modified activated carbon for purifying VOCs, which can obviously improve the adsorption effect of the activated carbon on the VOCs.
In order to achieve the above object, the present invention provides the following technical solutions:
in order to achieve the purpose, the technical scheme of the invention is as follows:
a preparation method of modified activated carbon comprises the following steps: (1) mixing activated carbon and an activating agent, and reacting for 1-2 hours at 1000-1200 ℃ under the protection of inert gas; (2) after the reaction, fully washing with clear water; (3) mixing the modifier 1 with the washed activated carbon, fully mixing at the temperature of 60-80 ℃, reacting for 18-24 hours, and fully washing with clear water; (4) reacting the active carbon treated in the step (3) with a modifier 2 for 3-6 hours, and then fully washing with clear water; (5) after drying, soaking in an alcohol solution for 2-6 h, and drying; the activating agent is alkali, the modifying agent 1 is at least one of phosphoric acid, peroxide and persulfate, and the modifying agent 2 is an organic solution.
Preferably, the activator is KOH.
Preferably, the mass ratio of activated carbon: 1 of the activator: 1 to 3.
Preferably, the modifier 1 is a mixture of phosphoric acid, hydrogen peroxide and sodium persulfate.
Preferably, the modifier 1 consists of 1 part by mass of phosphoric acid, 3-5 parts by mass of hydrogen peroxide and 4-7 parts by mass of sodium persulfate.
Preferably, the modifier 2 is at least one of chloroform, toluene and tetrahydrofuran.
Preferably, the modifier 2 is composed of 10-15 parts by mass of chloroform, 3-8 parts by mass of toluene and 3-6 parts by mass of tetrahydrofuran.
Preferably, in the step (5), the alcohol solution is a 50-75% methanol solution.
A preparation method of activated carbon, and an application of the activated carbon in preparing modified activated carbon for purifying VOCs.
The invention has the beneficial effects that: the activated carbon prepared by the method has the characteristics of good adsorption effect, high adsorption speed and good adsorption effect, and greatly meets the requirement of purifying VOCs related gases.
Detailed Description
The following further illustrates embodiments of the invention:
example 1
The activated carbon was prepared according to the following procedure,
mixing 1kg of activated carbon and 1kg of potassium hydroxide, and reacting at 1000 ℃ for 2h under the protection of inert gas;
washing the mixture obtained after the reaction in the last step by using purified water until the pH value of the water after washing is not changed;
drying the product washed in the last step, adding hydrogen peroxide, fully mixing at the temperature of 80 ℃, reacting for 18 hours, and drying;
adding the activated carbon treated in the last step into toluene, fully mixing and stirring for 6 hours;
filtering, drying, soaking in 75% methanol solution for 6 hr, drying, washing with clear water, and drying.
Example 2
The activated carbon was prepared according to the following procedure,
mixing 1kg of activated carbon and 3kg of potassium hydroxide, and reacting at 1200 ℃ for 1h under the protection of inert gas;
washing the mixture obtained after the reaction in the last step by using purified water until the pH value of the water after washing is not changed;
drying the product washed in the last step, and adding a hydrogen peroxide, sodium peroxide and phosphoric acid composition, wherein the hydrogen peroxide is calculated according to the mass ratio: sodium peroxide and phosphoric acid are fully mixed at the temperature of 60 ℃, reacted for 24 hours and dried;
adding the activated carbon treated in the last step into chloroform, fully mixing and stirring for 3 hours;
filtering, drying, soaking in 50% methanol solution for 2 hr, drying, washing with clear water, and drying.
Example 3
The activated carbon was prepared according to the following procedure,
mixing 1kg of activated carbon and 2kg of potassium hydroxide, and reacting at 1200 ℃ for 1h under the protection of inert gas;
washing the mixture obtained after the reaction in the last step by using purified water until the pH value of the water after washing is not changed;
drying the product washed in the last step, and adding a hydrogen peroxide, sodium peroxide and phosphoric acid composition, wherein the hydrogen peroxide is calculated according to the mass ratio: sodium peroxide and phosphoric acid are mixed fully at the temperature of 80 ℃, reacted for 24 hours and dried;
adding the activated carbon treated in the last step into an organic solution, wherein the organic solution consists of chloroform, toluene and tetrahydrofuran, and the mass ratio of chloroform: toluene: tetrahydrofuran 10: 3: 3, fully mixing and stirring for 3 hours;
filtering, drying, soaking in 50% methanol solution for 2 hr, drying, washing with clear water, and drying.
Example 4
The activated carbon was prepared according to the following procedure,
mixing 1kg of activated carbon and 2kg of potassium hydroxide, and reacting at 1200 ℃ for 1h under the protection of inert gas;
washing the mixture obtained after the reaction in the last step by using purified water until the pH value of the water after washing is not changed;
drying the product washed in the last step, and adding a hydrogen peroxide, sodium peroxide and phosphoric acid composition, wherein the hydrogen peroxide is calculated according to the mass ratio: sodium peroxide and phosphoric acid are mixed fully at the temperature of 80 ℃, reacted for 24 hours and dried;
adding the activated carbon treated in the last step into an organic solution, wherein the organic solution consists of chloroform, toluene and tetrahydrofuran, and the mass ratio of chloroform: toluene: tetrahydrofuran 15: 8: 6, fully mixing and stirring for 3 hours;
filtering, drying, soaking in 50% methanol solution for 2 hr, drying, washing with clear water, and drying.
Comparative example 1
The activated carbon before the reaction was used as comparative example 1.
Comparative example 2
Activated carbon was treated with alkali as comparative example. The activated carbon was treated as follows: taking 1kg of pretreated activated carbon, putting the pretreated activated carbon in 4L of sodium hydroxide solution with different concentrations of 5mol/L, placing the activated carbon in a constant-temperature water bath oscillator, slightly oscillating for 2h at the water temperature of 60 ℃, and soaking for 24 h. And after modification, carrying out suction filtration on the reaction solution until the pH values of the cleaning solution and distilled water are basically consistent, and then drying at 110 ℃ to constant weight.
Examples of the experiments
The adsorption experiments of the VOCS gases in examples 1-4 and comparative examples 1 and 2 were respectively carried out, and the saturated adsorption amount was calculated, and the effects are shown in the following table:
while the preferred embodiments of the present invention have been illustrated and described, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (9)
1. A preparation method of modified activated carbon comprises the following steps: (1) mixing activated carbon and an activating agent, and reacting for 1-2 hours at 1000-1200 ℃ under the protection of inert gas; (2) after the reaction, fully washing with clear water; (3) mixing the modifier 1 with the washed activated carbon, fully mixing at the temperature of 60-80 ℃, reacting for 18-24 hours, and fully washing with clear water; (4) reacting the active carbon treated in the step (3) with a modifier 2 for 3-6 hours, and then fully washing with clear water; (5) after drying, soaking in an alcohol solution for 2-6 h, and drying; the activating agent is alkali, the modifying agent 1 is at least one of phosphoric acid, peroxide and persulfate, and the modifying agent 2 is an organic solution.
2. The method of claim 1, wherein the activator is KOH.
3. The production method according to claim 1, wherein the ratio by mass of activated carbon: =1 of activator: 1 to 3.
4. The preparation method of claim 1, wherein the modifier 1 is a mixture of phosphoric acid, hydrogen peroxide and sodium persulfate.
5. The preparation method according to claim 1, wherein the modifier 1 comprises, by mass, 1 part of phosphoric acid, 3 to 5 parts of hydrogen peroxide, and 4 to 7 parts of sodium persulfate.
6. The method according to claim 1, wherein the modifier 2 is at least one of chloroform, toluene, and tetrahydrofuran.
7. The method according to claim 1, wherein the modifier 2 comprises 10 to 15 parts by mass of chloroform, 3 to 8 parts by mass of toluene, and 3 to 6 parts by mass of tetrahydrofuran.
8. The method according to claim 1, wherein in the step (5), the alcohol solution is 50 to 75% methanol solution.
9. The use of the process according to any one of claims 1 to 8 for the preparation of modified activated carbon for the purification of VOCs.
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| CN202110442040.1A CN113244884A (en) | 2021-04-23 | 2021-04-23 | Modified activated carbon for purifying VOCs (volatile organic compounds) and preparation method thereof |
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| CN202110442040.1A CN113244884A (en) | 2021-04-23 | 2021-04-23 | Modified activated carbon for purifying VOCs (volatile organic compounds) and preparation method thereof |
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Citations (6)
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| KR20050028624A (en) * | 2003-09-19 | 2005-03-23 | 한국전력공사 | Adsorbent for carbon dioxide fixation and method for preparing the same |
| CN104209093A (en) * | 2014-09-29 | 2014-12-17 | 西安华陆环保设备有限公司 | Preparation method for modified activated carbon fibres used for formaldehyde adsorption |
| CN107115843A (en) * | 2017-05-23 | 2017-09-01 | 江苏大学 | A kind of preparation method and applications for coming from peanut shell modified activated carbon |
| CN107913690A (en) * | 2017-11-13 | 2018-04-17 | 常州鑫邦再生资源利用有限公司 | A kind of renovation process of powdered activated carbon |
| CN110745825A (en) * | 2019-12-16 | 2020-02-04 | 江苏科技大学 | Preparation method of high-performance biomass-based shaddock peel oriented activated carbon VOCs adsorbent |
| CN110813240A (en) * | 2019-12-16 | 2020-02-21 | 江苏科技大学 | Preparation method and application of an ultra-high performance biomass-based banana peel-oriented activated carbon VOCs adsorbent |
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2021
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| KR20050028624A (en) * | 2003-09-19 | 2005-03-23 | 한국전력공사 | Adsorbent for carbon dioxide fixation and method for preparing the same |
| CN104209093A (en) * | 2014-09-29 | 2014-12-17 | 西安华陆环保设备有限公司 | Preparation method for modified activated carbon fibres used for formaldehyde adsorption |
| CN107115843A (en) * | 2017-05-23 | 2017-09-01 | 江苏大学 | A kind of preparation method and applications for coming from peanut shell modified activated carbon |
| CN107913690A (en) * | 2017-11-13 | 2018-04-17 | 常州鑫邦再生资源利用有限公司 | A kind of renovation process of powdered activated carbon |
| CN110745825A (en) * | 2019-12-16 | 2020-02-04 | 江苏科技大学 | Preparation method of high-performance biomass-based shaddock peel oriented activated carbon VOCs adsorbent |
| CN110813240A (en) * | 2019-12-16 | 2020-02-21 | 江苏科技大学 | Preparation method and application of an ultra-high performance biomass-based banana peel-oriented activated carbon VOCs adsorbent |
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Effective date of registration: 20220516 Address after: 510000 Room 101, building 1, No. 10, Qijie Second Road, Nancun Town, Panyu District, Guangzhou City, Guangdong Province Applicant after: GUANGDONG HANYAN ACTIVATED CARBON TECHNOLOGY CO.,LTD. Address before: 350000 Xiayang Dongshan Industrial Park, Xiayang Town, Yongding District, Longyan City, Fujian Province Applicant before: Fujian Hanyan Environmental Protection Technology Co.,Ltd. |
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Application publication date: 20210813 |