CN111203182A - Modified activated carbon for adsorbing phenol and preparation method and application thereof - Google Patents
Modified activated carbon for adsorbing phenol and preparation method and application thereof Download PDFInfo
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- 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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- A—HUMAN NECESSITIES
- A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
- A24D—CIGARS; CIGARETTES; TOBACCO SMOKE FILTERS; MOUTHPIECES FOR CIGARS OR CIGARETTES; MANUFACTURE OF TOBACCO SMOKE FILTERS OR MOUTHPIECES
- A24D3/00—Tobacco smoke filters, e.g. filter-tips, filtering inserts; Filters specially adapted for simulated smoking devices; Mouthpieces for cigars or cigarettes
- A24D3/06—Use of materials for tobacco smoke filters
- A24D3/08—Use of materials for tobacco smoke filters of organic materials as carrier or major constituent
- A24D3/10—Use of materials for tobacco smoke filters of organic materials as carrier or major constituent of cellulose or cellulose derivatives
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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- 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
- B01D53/04—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 with stationary adsorbents
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- B—PERFORMING OPERATIONS; TRANSPORTING
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Abstract
The invention discloses modified activated carbon for adsorbing phenol and a preparation method and application thereof. The preparation method of the modified activated carbon for adsorbing phenol comprises the following steps: firstly, oxidizing active carbon by using an oxidant to obtain oxidized active carbon; then dipping the obtained oxidized activated carbon in a water solution containing small nitrogen molecules to obtain activated carbon adsorbed with the small nitrogen molecules; and then performing microwave irradiation treatment on the obtained activated carbon adsorbed with the nitrogen-containing micromolecules to obtain the modified activated carbon adsorbed with the phenol. The surface of the active carbon prepared by the invention has stable nitrogen-containing functional groups such as pyridine, pyrrole and amino, the pore structure and the specific surface of the active carbon are not greatly changed, and the mass transfer process of phenol in active carbon particles is not influenced, so that the adsorption capacity of the active carbon on phenol can be effectively improved.
Description
Technical Field
The invention belongs to the technical field of cigarette materials, and particularly relates to modified activated carbon for adsorbing phenol, and a preparation method and application thereof.
Background
Reducing the harm of cigarettes and keeping effective flavor components in smoke are the main problems in the current tobacco industry. Phenol, one of the main harmful components of smoke, has a strong corrosive effect on the skin and mucous membranes of human bodies. Researchers have long developed a variety of harm reduction techniques, with the development and application of cigarette filters being the most effective way to reduce harm. The cigarette filter is used for filtering particulate matters in cigarette smoke and adsorbing harmful components in the smoke to achieve the effect of reducing harm, and the traditional filter material is mainly prepared from acetate fibers and polypropylene fibers. These traditional filter materials have the advantages of strong elasticity, good air permeability, moderate suction resistance and high production efficiency. Researches show that by adding the adsorption materials such as biological materials, high polymer materials, nano composite materials and the like into the cigarette fiber filter tip, the harmful ingredients in the mainstream smoke of the cigarette can be further effectively reduced. Activated carbon was the most widely used cigarette filter additive material developed earlier, with coconut shell activated carbon being the most commonly used. The coconut shell activated carbon has higher hardness, specific surface area and micropore volume, has better adsorption performance on phenolic substances, and has less influence on the flavor of smoke when being added into cigarettes, so the coconut shell activated carbon is widely concerned. On the premise of ensuring the fragrance of the cigarettes, the improvement of the adsorption performance of the active carbon to harmful ingredients in smoke as far as possible becomes one of important tasks for improving the harm reduction effect of the cigarettes.
The phenol adsorption performance of the activated carbon is closely related to the distribution of the surface functional groups of the activated carbon. In the industrial production and storage processes, some hydrophilic oxygen-containing functional groups such as hydroxyl, carboxyl and the like are inevitably introduced to the surface of the activated carbon, so that the hydrophilicity of the surface of the activated carbon is increased, a water absorption layer is formed on the surface of the activated carbon, the pi electron interaction between phenol and the activated carbon is weakened, and the adsorption efficiency of phenol in smoke in cigarettes is influenced. The oxygen content on the surface of the activated carbon is reduced, and meanwhile, nitrogen-containing functional groups such as pyridine, quaternary nitrogen and the like are modified on the surface of the activated carbon, so that the adsorption capacity of the activated carbon on phenol can be remarkably improved. The traditional activated carbon treatment mode is to carry out co-pyrolysis on activated carbon and ammonia gas, so that the purposes of eliminating oxygen-containing groups on the surface of the activated carbon and increasing nitrogen-containing groups can be achieved, but the defects of high energy consumption, high equipment required strength and the like exist in a high-temperature environment. Patent CN 107080287a discloses a method for impregnation modification of activated carbon and application thereof, in which an acid solution is used to activate the activated carbon to increase the specific surface area and the mesoporous volume of the activated carbon to increase the adsorption capacity of the activated carbon to harmful substances in flue gas, but this method still cannot optimize the surface functional groups of the activated carbon; patent CN 101954274B discloses a composite material using porous material as carrier and loading ionic type sugar-containing copolymer on the outer layer to achieve the purpose of reducing phenol, but this method has complicated preparation steps, and the outer layer copolymer may block the microporous structure of activated carbon.
Disclosure of Invention
The invention mainly aims to provide modified activated carbon for adsorbing phenol and a preparation method thereof, so as to overcome the defects of the prior art.
In order to achieve the purpose, the technical scheme adopted by the invention comprises the following steps:
the embodiment of the invention provides a preparation method of modified activated carbon, which comprises the following steps:
oxidizing the activated carbon by using an oxidant to obtain oxidized activated carbon;
dipping the obtained oxidized activated carbon in a water solution containing small nitrogen molecules to obtain activated carbon adsorbed with the small nitrogen molecules;
and performing microwave irradiation treatment on the obtained activated carbon adsorbed with the nitrogen-containing micromolecules to obtain the modified activated carbon adsorbed with the phenol.
The embodiment of the invention also provides modified activated carbon for adsorbing phenol, which is prepared by the method.
The embodiment of the invention also provides application of the modified activated carbon for adsorbing phenol in preparing cigarette filters.
The embodiment of the invention also provides a cigarette filter, which comprises the modified activated carbon for adsorbing phenol.
Compared with the prior art, the invention has the beneficial effects that: the method adopts a pre-oxidation method to ensure that more active sites for nitrogen-containing micromolecules to adsorb are generated on the surface of the active carbon; utilize the heat effect that microwave produced at the active carbon granule for the active carbon surface generates comparatively stable nitrogenous functional group such as pyridine, pyrrole and amino, eliminates hydrophilic oxygen-containing group simultaneously, and the pore structure and the specific surface of active carbon change little moreover, do not influence the mass transfer process of phenol in the active carbon granule, thereby effectively increase the adsorption performance of active carbon to phenol. The filter tip prepared by the modified active carbon can obviously reduce the phenol content in smoke under the condition of not influencing the flavor of the cigarette, the modified active carbon provided by the invention has the advantages of simple modification condition, convenient and quick operation and low cost, and the modified active carbon is added into the cigarette filter tip without changing the existing filter tip processing equipment.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments described in the present application, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a spectrum of O1s before and after modification of activated carbon in example 1 of the present invention;
FIG. 2 is a map of N1s before and after modification of activated carbon in example 1 of the present invention;
FIG. 3 is a schematic structural view of a modified activated carbon according to an exemplary embodiment of the present invention applied to a cigarette;
FIG. 4 is a graph showing the phenol adsorption amounts (initial phenol concentration of 250mg/L) of modified activated carbons in a solution environment in examples 1 to 4 of the present invention;
FIG. 5 shows the phenol content in the mainstream smoke of cigarettes containing modified activated carbon ternary composite filter rods of examples 1 to 4 and comparative examples 1 to 2 of the present invention and unmodified activated carbon;
description of reference numerals: 1-acetate fiber filter element, 2-modified activated carbon particles, 3-acetate fiber filter element and 4-tobacco shred.
Detailed Description
In view of the defects of the prior art, the inventor of the present invention has long studied and practiced in a large amount to provide the technical scheme of the present invention, the present invention firstly oxidizes the surface of the activated carbon to generate an acidic oxygen-containing functional group capable of adsorbing or reacting with the nitrogen-containing small molecule; then, loading a nitrogen-containing functional component on the surface of the oxidized activated carbon by adopting an impregnation method, so that nitrogen-containing small molecules can enter activated carbon micropores, and part of the nitrogen-containing small molecules can generate strong adsorption with acidic oxygen-containing functional groups; the active carbon has stronger thermal responsiveness to microwaves in molecular scale, can quickly provide energy required by chemical reaction of nitrogen-containing molecules and the active carbon, so that stable nitrogen-containing functional groups such as pyridine, pyrrole and the like are generated on the surface of the active carbon, and meanwhile, the residual oxygen-containing functional groups on the surface of the active carbon can be decomposed, so that the functional group composition on the surface of the active carbon is regulated, controlled and optimized, and the adsorption of phenol in smoke by the active carbon is promoted.
The technical solutions of the present invention will be described clearly and completely below, and it should be apparent that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
One aspect of an embodiment of the present invention provides a method for preparing modified activated carbon for adsorbing phenol, including:
oxidizing the activated carbon by using an oxidant to obtain oxidized activated carbon;
dipping the obtained oxidized activated carbon in a water solution containing small nitrogen molecules to obtain activated carbon adsorbed with the small nitrogen molecules;
and performing microwave irradiation treatment on the obtained activated carbon adsorbed with the nitrogen-containing micromolecules to obtain the modified activated carbon adsorbed with the phenol.
In some more specific embodiments, the preparation method comprises: mixing activated carbon with an oxidant solution, stirring and reacting for 2-6h at room temperature, and washing and drying to obtain the oxidized activated carbon.
Further, the activated carbon is granular activated carbon.
Further, the activated carbon includes 40-60 mesh coconut shell activated carbon, and is not limited thereto.
Further, the oxidizing agent includes any one of a hydrogen peroxide solution and a nitric acid solution, and is not limited thereto.
Further, the concentration of the hydrogen peroxide solution is 5-15 wt%, preferably 8-12 wt%;
further, the concentration of the nitric acid solution is 25-68 wt%, preferably 30-50 wt%;
further, the washing solvent includes deionized water, and is not limited thereto.
Furthermore, the temperature of the drying treatment is 90-105 ℃, and the time is 2-6 h.
In some more specific embodiments, the preparation method comprises: mixing the obtained oxidized activated carbon with aqueous solution containing small nitrogen molecules, stirring for 8-24h, washing, and drying.
Further, the nitrogen-containing small molecule includes any one or a combination of two or more of ethylenediamine, propylenediamine, hexamethylenediamine, ammonium bicarbonate, ammonium carbonate, ammonia water, and triethylenetetramine, and is not limited thereto.
Further, the concentration of the aqueous solution of the small nitrogen-containing molecules is 5-15 wt%, preferably 10-12 wt%.
Further, the washing solvent includes distilled water.
Furthermore, the temperature of the drying treatment is 90-105 ℃, and the time is 2-6 h.
In some more specific embodiments, the microwave irradiation treatment uses a microwave power of 300-.
Further, the time of microwave irradiation is 2-8min, preferably 5-6 min.
The embodiment of the invention also provides modified activated carbon for adsorbing phenol, which is prepared by the method and is obtained by oxidation, adsorption and microwave radiation treatment.
In another aspect of the embodiment of the invention, the application of the modified activated carbon for adsorbing phenol in preparing cigarette filters is also provided.
Another aspect of an embodiment of the present invention also provides a cigarette filter comprising the aforementioned modified phenol-adsorbing activated carbon.
Further, the cigarette filter comprises an acetate fiber filter element.
Further, the cigarette filter comprises a cigarette filter rod.
Further, the filter rod includes any one of a binary composite filter rod and a ternary composite filter rod, and is not limited thereto.
Further, the modified activated carbon adsorbing phenol is added into a cigarette filter to prepare a cigarette filter rod.
In the invention, fig. 3 is a schematic structural diagram of applying modified activated carbon to cigarettes, wherein 1 represents an acetate fiber filter element, 2 represents modified activated carbon particles, 3 represents an acetate fiber filter element, and 4 represents cut tobacco.
The technical solutions of the present invention are further described in detail below with reference to several preferred embodiments and the accompanying drawings, which are implemented on the premise of the technical solutions of the present invention, and a detailed implementation manner and a specific operation process are provided, but the scope of the present invention is not limited to the following embodiments.
The experimental materials used in the examples used below were all available from conventional biochemical reagents companies, unless otherwise specified.
Example 1
The preparation of the modified activated carbon is applied to the ternary composite filter stick, and the content of phenol in main stream smoke is reduced.
The preparation method of the modified activated carbon comprises the following steps:
(1) dispersing 10g of coconut shell activated carbon with the particle size of 40-60 meshes in 100ml of hydrogen peroxide with the mass fraction of 5%, stirring for 2h at room temperature, keeping the stirring speed at 400r/min, filtering the suspension after the stirring is finished, washing the activated carbon particles with deionized water, then placing the activated carbon particles in a drying box, and drying for 4h at 105 ℃ to obtain oxidized coconut shell activated carbon;
(2) dispersing 1g of the oxidized coconut shell activated carbon obtained in the step (1) in 100ml of ethylenediamine aqueous solution with the mass fraction of 5%, and magnetically stirring for 10h at the constant temperature of 30 ℃, wherein the stirring speed is kept at 400 r/min. After stirring, filtering the suspension, washing the activated carbon with deionized water, placing the activated carbon in a drying box, and drying for 4 hours at the temperature of 105 ℃;
(3) and (3) placing the coconut shell activated carbon obtained in the step (2) in a microwave oven for microwave irradiation modification, wherein the microwave power is 300W, the irradiation time is 2min, and then moving to a dryer for cooling to obtain modified activated carbon particles. The obtained modified activated carbon O1s and N1s have spectrograms as shown in figure 1 and figure 2.
(4) 100mg of modified coconut shell activated carbon is weighed and filled into a filter element 2 with a cavity of 6mm to prepare the modified activated carbon ternary composite filter tip, and the structural schematic diagram is shown in figure 3.
Example 2
The preparation of the modified activated carbon is applied to the ternary composite filter stick, and the content of phenol in main stream smoke is reduced.
The preparation method of the modified activated carbon comprises the following steps:
(1) dispersing 10g of coconut shell activated carbon with the particle size of 40-60 meshes in 100ml of hydrogen peroxide with the mass fraction of 10%, stirring for 3h at room temperature, and keeping the stirring speed at 400 r/min. After stirring, filtering the suspension, washing the activated carbon particles with deionized water, then placing the activated carbon particles in a drying box, and drying the activated carbon particles for 4 hours at 105 ℃ to obtain oxidized coconut shell activated carbon;
(2) dispersing 1g of the oxidized coconut shell activated carbon obtained in the step (1) in 100ml of 10% by mass ethylene triamine aqueous solution, magnetically stirring for 10 hours at the constant temperature of 30 ℃, keeping the stirring speed at 400r/min, filtering the suspension after stirring, washing the activated carbon with deionized water, placing the activated carbon in a drying box, and drying for 4 hours at the temperature of 105 ℃;
(3) placing the coconut shell activated carbon obtained in the step (2) in a microwave oven for microwave irradiation modification, wherein the microwave power is 350W, the irradiation time is 5min, and then moving the coconut shell activated carbon to a dryer for cooling to obtain modified activated carbon particles;
(4) 100mg of modified coconut shell activated carbon is weighed and filled into a filter element 2 with a cavity of 6mm to prepare the modified activated carbon ternary composite filter tip, and the structural schematic diagram is shown in figure 3.
Example 3
The preparation of the modified activated carbon is applied to the ternary composite filter stick, and the content of phenol in main stream smoke is reduced.
The preparation method of the modified activated carbon comprises the following steps:
(1) dispersing 10g of coconut shell activated carbon with the particle size of 40-60 meshes in 100ml of hydrogen peroxide with the mass fraction of 15%, stirring for 6h at room temperature, keeping the stirring speed at 400r/min, filtering the suspension after the stirring is finished, washing the activated carbon particles with deionized water, then placing the activated carbon particles in a drying box, and drying for 4h at 105 ℃ to obtain oxidized coconut shell activated carbon;
(2) dispersing 1g of the oxidized coconut shell activated carbon obtained in the step (1) in 100ml of 15% triethylene tetramine aqueous solution, magnetically stirring for 8 hours at a constant temperature of 30 ℃, keeping the stirring speed at 400r/min, filtering the suspension after stirring, washing the activated carbon to be neutral by using deionized water, placing the activated carbon in a drying box, and drying for 4 hours at a temperature of 105 ℃;
(3) placing the coconut shell activated carbon obtained in the step (2) in a microwave oven for microwave irradiation modification, wherein the microwave power is 500W, the irradiation time is 8min, and then moving the coconut shell activated carbon to a dryer for cooling to obtain modified activated carbon particles;
(4) 100mg of modified coconut shell activated carbon is weighed and filled into a filter element 2 with a cavity of 6mm to prepare the modified activated carbon ternary composite filter tip, and the structural schematic diagram is shown in figure 3.
Example 4
The preparation of the modified activated carbon is applied to the ternary composite filter stick, and the content of phenol in main stream smoke is reduced.
The preparation method of the modified activated carbon comprises the following steps:
(1) dispersing 10g of coconut shell activated carbon with the particle size of 20-40 meshes in 100ml of nitric acid solution with the mass fraction of 40%, stirring for 3h at room temperature, keeping the stirring speed at 400r/min, filtering the suspension after the stirring is finished, washing the activated carbon particles with deionized water, then placing the activated carbon particles in a drying box, and drying for 4h at 105 ℃ to obtain oxidized coconut shell activated carbon;
(2) dispersing 1g of the oxidized coconut shell activated carbon obtained in the step (1) in 100ml of propylene diamine aqueous solution with the mass fraction of 15%, magnetically stirring for 24 hours at the constant temperature of 30 ℃, keeping the stirring speed at 400r/min, filtering the suspension after stirring, washing the activated carbon with deionized water to be neutral, placing the activated carbon in a drying box, and drying for 4 hours at the temperature of 105 ℃;
(3) placing the coconut shell activated carbon obtained in the step (2) in a microwave oven for microwave irradiation modification, wherein the microwave power is 350W, the irradiation time is 5min, and then moving the coconut shell activated carbon to a dryer for cooling to obtain modified activated carbon particles;
(4) 100mg of modified coconut shell activated carbon is weighed and filled into a filter element 2 with a cavity of 6mm to prepare the modified activated carbon ternary composite filter tip, and the structural schematic diagram is shown in figure 3.
Comparative example 1
This example is a comparative example of examples 1 to 4 above
100mg of the above unmodified coconut shell activated carbon particles of 40-60 meshes are weighed and filled in a filter element 2 with a cavity of 6mm to prepare the ternary composite filter tip, as shown in figure 3.
Comparative example 2
This example is a comparative example of examples 1 to 4 above
The filter stick adopted in the embodiment is a commercially available cigarette filter stick containing acetate fibers and not subjected to any treatment.
The adsorption capacity of the modified activated carbon prepared in examples 1 to 4 and the unmodified activated carbon to phenol in an aqueous solution are shown in fig. 4 (the initial concentration of phenol is 250mg/L), and it can be seen that the adsorption capacity of the modified activated carbon obtained by the method of the present invention to phenol is significantly improved compared with the unmodified activated carbon; the filters prepared in examples 1-4 and comparative examples 1-2 were subjected to a simulated smoking experiment, particulate matters of mainstream smoke of cigarettes were collected by a cambridge filter, and the content of phenol in the extract was determined by liquid chromatography, with the test results shown in fig. 5. The modified activated carbon composite filters prepared in the embodiments 1 to 4 can reduce the phenol content in the mainstream smoke of the cigarettes, the reduction range is up to 20.5 to 40 percent compared with that of the comparative example 1, and the evaluation of the cigarette taste shows that the prepared ternary composite filter has no obvious influence on the original fragrance and smoking taste of the cigarettes.
In addition, the inventors of the present invention have also made experiments with other materials, process operations, and process conditions described in the present specification with reference to the above examples, and have obtained preferable results.
The aspects, embodiments, features and examples of the present invention should be considered as illustrative in all respects and not intended to be limiting of the invention, the scope of which is defined only by the claims. Other embodiments, modifications, and uses will be apparent to those skilled in the art without departing from the spirit and scope of the claimed invention.
The use of headings and chapters in this disclosure is not meant to limit the disclosure; each section may apply to any aspect, embodiment, or feature of the disclosure.
Throughout this specification, where a composition is described as having, containing, or comprising specific components or where a process is described as having, containing, or comprising specific process steps, it is contemplated that the composition of the present teachings also consist essentially of, or consist of, the recited components, and the process of the present teachings also consist essentially of, or consist of, the recited process steps.
It should be understood that the order of steps or the order in which particular actions are performed is not critical, so long as the teachings of the invention remain operable. Further, two or more steps or actions may be performed simultaneously.
While the invention has been described with reference to illustrative embodiments, it will be understood by those skilled in the art that various other changes, omissions and/or additions may be made and substantial equivalents may be substituted for elements thereof without departing from the spirit and scope of the invention. In addition, many modifications may be made to adapt a particular situation or material to the teachings of the invention without departing from its scope. Therefore, it is intended that the invention not be limited to the particular embodiment disclosed for carrying out this invention, but that the invention will include all embodiments falling within the scope of the appended claims. Moreover, unless specifically stated any use of the terms first, second, etc. do not denote any order or importance, but rather the terms first, second, etc. are used to distinguish one element from another.
Claims (10)
1. A preparation method of modified activated carbon for adsorbing phenol is characterized by comprising the following steps:
oxidizing the activated carbon by using an oxidant to obtain oxidized activated carbon;
dipping the obtained oxidized activated carbon in a water solution containing small nitrogen molecules to obtain activated carbon adsorbed with the small nitrogen molecules;
and performing microwave irradiation treatment on the obtained activated carbon adsorbed with the nitrogen-containing micromolecules to obtain the modified activated carbon adsorbed with the phenol.
2. The production method according to claim 1, characterized by comprising: and uniformly mixing the activated carbon and an oxidant, stirring and reacting for 2-6h at room temperature, and washing and drying to obtain the oxidized activated carbon.
3. The method of claim 2, wherein: the activated carbon is granular activated carbon, preferably, the activated carbon comprises 40-60 mesh coconut shell activated carbon;
and/or the oxidant comprises hydrogen peroxide solution and/or nitric acid solution; preferably, the concentration of the hydrogen peroxide solution is 5-15 wt%, preferably 8-12 wt%; preferably, the concentration of the nitric acid solution is 25-68 wt%, preferably 30-50 wt%;
and/or the reaction time is 2-6 h.
4. The production method according to claim 1, characterized by comprising: mixing the obtained oxidized activated carbon with aqueous solution containing small nitrogen molecules, stirring for 8-24h, washing, and drying.
5. The method of claim 4, wherein: the nitrogen-containing micromolecules comprise any one or the combination of more than two of ethylene triamine, ethylene diamine, propylene diamine, hexamethylene diamine, ammonium bicarbonate, ammonium carbonate, ammonia water and triethylene tetramine; preferably, the concentration of the aqueous solution of the small nitrogen-containing molecules is 5 to 15 wt%, preferably 10 to 12 wt%.
6. The method of claim 1, wherein: the microwave power adopted by the microwave irradiation treatment is 300-500W, preferably 320-380W;
and/or, the time of the microwave irradiation is 2-8min, preferably 5-6 min.
7. Modified phenol-adsorbing activated carbon prepared by the process of any one of claims 1 to 6.
8. Use of the modified phenol-adsorbing activated carbon according to claim 7 for the preparation of cigarette filters.
9. A cigarette filter comprising the modified phenol-adsorbing activated carbon according to claim 5.
10. The cigarette filter according to claim 9, wherein the cigarette filter comprises a cigarette filter rod; preferably, the cigarette filter rod comprises a binary composite filter rod and/or a ternary composite filter rod.
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| CN112473622A (en) * | 2020-11-17 | 2021-03-12 | 安徽节源环保科技有限公司 | Modified biochar for adsorbing high-concentration phenolic wastewater and preparation method thereof |
| CN113172069A (en) * | 2021-04-06 | 2021-07-27 | 杭州楠大环保科技有限公司 | Kitchen waste treatment method |
| CN115893832A (en) * | 2022-12-16 | 2023-04-04 | 上海太洋科技有限公司 | Infrared filter glass and preparation method thereof |
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