CN109174004B - Method for improving essence slow-release performance of activated carbon and application - Google Patents

Method for improving essence slow-release performance of activated carbon and application Download PDF

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CN109174004B
CN109174004B CN201811308307.2A CN201811308307A CN109174004B CN 109174004 B CN109174004 B CN 109174004B CN 201811308307 A CN201811308307 A CN 201811308307A CN 109174004 B CN109174004 B CN 109174004B
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activated carbon
essence
carbon
quantum dots
drying
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CN109174004A (en
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冯守爱
刘鸿
黄江锋
韦康
胡志忠
李志华
农李政
宁振兴
邹克兴
潘连华
黄宇亮
陈义昌
宋凌勇
白家峰
黄东业
薛云
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China Tobacco Guangxi Industrial Co Ltd
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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
    • A—HUMAN NECESSITIES
    • A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
    • A24B—MANUFACTURE OR PREPARATION OF TOBACCO FOR SMOKING OR CHEWING; TOBACCO; SNUFF
    • A24B15/00—Chemical features or treatment of tobacco; Tobacco substitutes, e.g. in liquid form
    • A24B15/18—Treatment of tobacco products or tobacco substitutes
    • A—HUMAN NECESSITIES
    • A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
    • A24B—MANUFACTURE OR PREPARATION OF TOBACCO FOR SMOKING OR CHEWING; TOBACCO; SNUFF
    • A24B3/00—Preparing tobacco in the factory
    • A24B3/12—Steaming, curing, or flavouring tobacco
    • 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
    • A24D3/02—Manufacture of tobacco smoke filters
    • 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
    • B01J20/30—Processes for preparing, regenerating, or reactivating
    • C—CHEMISTRY; METALLURGY
    • C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
    • C11B—PRODUCING, e.g. BY PRESSING RAW MATERIALS OR BY EXTRACTION FROM WASTE MATERIALS, REFINING OR PRESERVING FATS, FATTY SUBSTANCES, e.g. LANOLIN, FATTY OILS OR WAXES; ESSENTIAL OILS; PERFUMES
    • C11B9/00—Essential oils; Perfumes
    • C11B9/02—Recovery or refining of essential oils from raw materials

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Organic Chemistry (AREA)
  • Analytical Chemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Wood Science & Technology (AREA)
  • Engineering & Computer Science (AREA)
  • Inorganic Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Cosmetics (AREA)
  • Carbon And Carbon Compounds (AREA)
  • Coloring Foods And Improving Nutritive Qualities (AREA)

Abstract

The invention discloses a method for improving the slow release performance of activated carbon to essence and application thereof. According to the invention, activated carbon is firstly acidified to enable the surface of the activated carbon to have acidic groups such as hydroxyl, carboxyl and the like, and then water-soluble carbon quantum dots, acidified activated carbon and liquid essence are mixed, so that the dispersibility of the activated carbon in the liquid essence is improved due to the abundant water-soluble groups on the surface of the carbon quantum dots, the types of adsorption sites and the permeability of the essence into the activated carbon are increased, and the adsorption is facilitated; during desorption, the specific surface area and the pore volume of the acidified active carbon are increased, so that the release rate is relatively increased, and the quantization of the surface of the active carbon does not influence the adsorption of the active carbon on the essence, but also weakens the adsorption binding force of the surface of the active carbon on the essence, and improves the slow release capacity. The modified activated carbon adsorption essence prepared by the method is used in cigarette filters, and the aroma can be stably and uniformly released at the temperature of 45-65 ℃, so that the modified activated carbon adsorption essence has a good slow release effect.

Description

Method for improving essence slow-release performance of activated carbon and application
Technical Field
The invention belongs to the technical field of preparation of slow-release essence, and particularly relates to a method for improving the slow-release performance of activated carbon on essence and application thereof.
Background
The aroma and the fragrance of the cigarette and the release of the fragrance in the smoking process are important factors for evaluating the quality of the cigarette, and the fragrance directly influences the smell and taste of the cigarette for consumers. The essence and spice are added into the cigarette, and the effects of improving the physical and chemical properties of the cigarette, moistening the fragrance, modifying the fragrance, improving the smoking taste and determining the style of the product are achieved. In a plurality of flavoring technologies, the method for adding the adsorbent into the filter tip draws attention of researchers because the method can realize the controllability of the storage and the release of the spice and ensure the pure spice, and fully utilizes the advantages of the spice and the like. The adsorption material is the key of the flavoring technology for adding the adsorbent to the filter tip, and directly influences the utilization rate and the flavoring effect of the spice in the flavoring process.
The activated carbon has abundant pore structures and huge specific surface area, so that the activated carbon is widely applied to the fields of adsorption, separation and the like, and the adsorption performance of the activated carbon is determined by the surface pore structures and surface chemical properties of the activated carbon. Wherein the surface chemistry is mainly determined by oxygen-containing functional groups and nitrogen-containing functional groups, and the oxygen-containing functional groups are further divided into acidic groups and basic groups, wherein the acidic groups include carboxyl, phenolic hydroxyl, lactone groups, etc., which can react with Lewis bases. Therefore, the surface acidity and alkalinity of the activated carbon can be adjusted through modification, and the adsorption performance of the activated carbon on adsorbates can be further adjusted. The invention patent (201410843396.6) discloses the application of hydrochloric acid modified activated carbon in preparing the slow release or controlled release of the tobacco flavor, and although the adsorption rate of the essence is improved by the activated carbon treated by hydrochloric acid, the problems of poor reproducibility and particularly poor desorption slow release effect exist.
The carbon quantum dot is a novel fluorescent carbon nano material with the particle size of less than 10nm and a graphite crystal form or diamond-like structure, and is monodisperse spheroidal nano particles with carbon as a basic skeleton and a large number of oxygen-containing groups on the surface. The carbon quantum dots mainly comprise two types, one is sp2Or in sp3The hybridized carbon is a core, and is connected with-OH, C-O-C, -COOH or-NH at the edge2Etc., with a distinct lattice; the other is amorphous carbon, with no apparent lattice structure. The carbon quantum dots have the properties of low toxicity, biocompatibility, good water solubility, excellent stability and the like.
Disclosure of Invention
Aiming at the defects of the prior art, the inventor finds that the surface of the activated carbon is provided with acid groups such as hydroxyl, carboxyl and the like by acidification, and then the activated carbon is introduced through water-soluble carbon quantum dots, so that the dispersibility of the activated carbon in liquid essence is improved, the types of adsorption sites and the permeability of the essence into the activated carbon are increased, and the activated carbon is convenient to adsorb; during desorption, the specific surface area and the pore volume of the acidified active carbon are increased, so that the release rate is relatively increased, the quantization of the surface of the active carbon does not influence the adsorption of the active carbon on the essence, the adsorption binding force of the surface of the active carbon on the essence is weakened, and the slow release capacity is improved.
The invention provides a method for improving the slow release performance of activated carbon to essence, which comprises the following steps:
(1) preparing carbon quantum dots;
(2) acidifying the activated carbon;
(3) preparing liquid essence;
(4) and (3) mixing the acidified active carbon prepared in the step (2), the carbon quantum dots prepared in the step (1) and the liquid essence prepared in the step (3), separating and adsorbing the essence-adsorbed active carbon, and airing to obtain the essence-adsorbed active carbon.
Preferably, the method for preparing the carbon quantum dots by the step (1) comprises the following steps: dissolving 0.2-0.5g of urea phosphate, 0.3-0.6g of citric acid and 0.8-1.0mL of ethylenediamine in 25-50mL of deionized water; and then placing the solution in a microwave digestion instrument for reaction to obtain a clear transparent solution, centrifuging, taking supernate, and drying to obtain the carbon quantum dots.
Preferably, the reaction conditions in the microwave digestion instrument in the step (1) are as follows: the reaction temperature is raised to 150 ℃ within 1min, and the reaction is kept unchanged for 30 min.
Preferably, the drying temperature in the step (1) is 60 ℃, and the drying time is 12-24 h.
Preferably, the method for acidifying activated carbon in step (2) comprises: soaking activated carbon in 0.1mol/L HCl or HNO3 solution for 2h, placing in water bath at room temperature, oscillating for 12-20h, washing with distilled water until the surface of the activated carbon is neutral, vacuum filtering, and drying at 100 deg.C for 3-6h to obtain acidified activated carbon.
Preferably, the activated carbon in the step (2) is reacted with HCl or HNO3The weight-volume ratio of the solution is 1: 3-5.
Preferably, the method for preparing the liquid essence in the step (3) comprises the following steps: dissolving menthol or vanillin in anhydrous ethanol at a weight-volume ratio of 1: 3-5.
Preferably, after the essence-adsorbing activated carbon is separated in the step (4), the solid is washed respectively with 75% ethanol and distilled water for 3-5 times until the solid is neutral.
Preferably, the weight volume ratio of the acidified activated carbon, the carbon quantum dots and the liquid essence in the step (4) is 1:0.03-0.05: 3-5.
Preferably, the method comprises the steps of:
(1) preparing the carbon quantum dots: 0.2-0.5g of urea phosphate, 0.3-0.6g of citric acid and 0.8-1.0mL of ethylenediamine are dissolved in 25-50mL of deionized water. The solution was then transferred to a microwave digestion tank, sealed and placed in a microwave digestion apparatus. The temperature programming was set to: the reaction temperature is raised to 150 ℃ within 1min, and the reaction is kept unchanged for 30 min. Cooling to room temperature, centrifuging the obtained clear transparent solution at 10000rpm for 15min, and drying the supernatant in a vacuum drying oven at 60 deg.C for 12-24 h.
(2) Acidifying activated carbon: taking activated carbon, adding HCl or HNO of 0.1mol/L3Soaking in the solution for 2h, placing in water bath at room temperature, shaking for 12-20h, washing with distilled water until the surface of activated carbon is neutral, vacuum filtering, and drying at 100 deg.C for 3-6 h.
(3) Preparing liquid essence: dissolving menthol or vanillin in anhydrous alcohol at a weight-volume ratio of 1: 3-5.
(4) Mixing the acidified active carbon prepared in the step (2), the carbon quantum dots prepared in the step (1) and the liquid essence prepared in the step (3), placing the mixture in a shaking table for 20-24h, separating and adsorbing the essence active carbon, respectively washing the mixture for 3-5 times by using 75% ethanol and distilled water until the solid is neutral, and naturally drying the mixture to obtain the essence-adsorbed active carbon.
The invention also provides the activated carbon for adsorbing the essence, which is prepared by the method for improving the slow release performance of the activated carbon on the essence.
The invention also provides application of the activated carbon for adsorbing the essence in cigarette preparation.
Preferably, the prepared activated carbon adsorbing the essence is applied to a cigarette filter tip for sensory evaluation and release rate measurement to evaluate the slow release performance of the activated carbon.
The invention has the following remarkable advantages:
1. acidifying the activated carbon to enable the surface of the activated carbon to have acid groups such as hydroxyl, carboxyl and the like, so that the surface polarity is enhanced, and the affinity of the activated carbon to polar substances is enhanced; and secondly, a surface group capable of further modifying the carbon quantum dots is provided.
2. The acidified active carbon is mixed with the carbon quantum dots, so that the dispersibility of the active carbon in the essence is improved; and secondly, an active group capable of forming a chemical bond with the essence is provided, so that the alkalinity of the modified activated carbon is weakened, micropores are reduced, mesopores are developed, macropores are basically unchanged, and the adsorption capacity and desorption capacity are improved.
3. The activated carbon for adsorbing the essence prepared by the method is used in cigarette filters, and the aroma can be stably and uniformly released at the temperature of 45-65 ℃, so that the activated carbon has a good slow release effect.
Detailed Description
The invention is further illustrated with reference to the following examples, without limiting the scope of the invention thereto.
Example 1
(1) Preparing the carbon quantum dots: 0.2g of urea phosphate, 0.3g of citric acid and 0.8mL of ethylenediamine were dissolved in 25mL of deionized water. The solution was then transferred to a microwave digestion tank, sealed and placed in a microwave digestion apparatus. The temperature programming was set to: the reaction temperature is raised to 150 ℃ within 1min, and the reaction is kept unchanged for 30 min. After cooling to room temperature, the obtained clear transparent solution is centrifuged at 10000rpm for 15min, and the supernatant is dried in a vacuum drying oven at 60 ℃ for 12h to obtain the product.
(2) Acidifying activated carbon: soaking 100g of activated carbon in 300mL of 0.1mol/L HCl solution for 2h, placing the solution in a water bath at room temperature, oscillating the solution for 12h, washing the solution with distilled water until the surface of the activated carbon is neutral, performing suction filtration, and drying the solution at 100 ℃ for 3h to obtain the activated carbon.
(3) Preparing liquid essence: 10g of menthol was dissolved in 30mL of absolute ethanol.
(4) And (3) mixing 10g of the acidified activated carbon prepared in the step (2), 0.3g of the carbon quantum dots prepared in the step (1) and 30mL of the liquid essence prepared in the step (3), placing the mixture in a shaking table for 20h, centrifugally separating and adsorbing the essence-adsorbed activated carbon, respectively washing the mixture for 3 times by using 75% ethanol and distilled water until the solid is neutral, and naturally drying the mixture to obtain the essence-adsorbed activated carbon.
Example 2
(1) Preparing the carbon quantum dots: 0.5g of urea phosphate, 0.6g of citric acid and 0.9mL of ethylenediamine were dissolved in 50mL of deionized water. The solution was then transferred to a microwave digestion tank, sealed and placed in a microwave digestion apparatus. The temperature programming was set to: the reaction temperature is raised to 150 ℃ within 1min, and the reaction is kept unchanged for 30 min. After cooling to room temperature, the obtained clear transparent solution is centrifuged at 10000rpm for 15min, and the supernatant is dried in a vacuum drying oven at 60 ℃ for 24h to obtain the product.
(2) Acidifying activated carbon: taking 100g of active carbon and adding 0.1 mol/400 mL of active carbonL HNO3Soaking in the solution for 2h, placing in water bath at room temperature, shaking for 20h, washing with distilled water until the surface of the activated carbon is neutral, vacuum filtering, and drying at 100 deg.C for 5 h.
(3) Preparing liquid essence: 10g of menthol was dissolved in 50mL of absolute ethanol.
(4) And (3) mixing 10g of the acidified activated carbon prepared in the step (2), 0.5g of the carbon quantum dots prepared in the step (1) and 50mL of the liquid essence prepared in the step (3), placing the mixture in a shaking table for 24h, centrifugally separating and adsorbing the essence-adsorbed activated carbon, respectively washing the mixture for 5 times by using 75% ethanol and distilled water until the solid is neutral, and naturally drying the mixture to obtain the essence-adsorbed activated carbon.
Example 3
(1) Preparing the carbon quantum dots: 0.4g of urea phosphate, 0.5g of citric acid and 1.0mL of ethylenediamine were dissolved in 40mL of deionized water. The solution was then transferred to a microwave digestion tank, sealed and placed in a microwave digestion apparatus. The temperature programming was set to: the reaction temperature is raised to 150 ℃ within 1min, and the reaction is kept unchanged for 30 min. After cooling to room temperature, the obtained clear transparent solution is centrifuged at 10000rpm for 15min, and the supernatant is dried in a vacuum drying oven at 60 ℃ for 20h to obtain the product.
(2) Acidifying activated carbon: taking 100g of active carbon, and adding the active carbon in 500mL of 0.1mol/L HNO3Soaking in the solution for 2h, placing in water bath at room temperature, shaking for 15h, washing with distilled water until the surface of the activated carbon is neutral, vacuum filtering, and drying at 100 deg.C for 6 h.
(3) Preparing liquid essence: 10g of vanillin was dissolved in 40mL of absolute ethanol.
(4) And (3) mixing 10g of the acidified activated carbon prepared in the step (2), 0.4g of the carbon quantum dots prepared in the step (1) and 40mL of the liquid essence prepared in the step (3), placing the mixture in a shaking table for 24h, centrifugally separating and adsorbing the essence-adsorbed activated carbon, respectively washing the mixture with 75% ethanol and distilled water for 4 times until the solid is neutral, and naturally drying the mixture to obtain the essence-adsorbed activated carbon.
Example 4
(1) Preparing the carbon quantum dots: same as example 1, step (1);
(2) taking 100g of acidified active carbon, soaking in 500mL of 0.1mol/L HCl solution for 2h, placing in water bath at room temperature, oscillating for 20h, washing with distilled water until the surface of the active carbon is neutral, performing suction filtration, and drying at 100 ℃ for 6h to obtain the final product.
(3) Preparing liquid essence: 10g of vanillin was dissolved in 50mL of absolute ethanol.
(4) And (3) mixing 10g of the acidified activated carbon prepared in the step (2), 0.3g of the carbon quantum dots prepared in the step (1) and 30mL of the liquid essence prepared in the step (3), placing the mixture in a shaking table for 20h, centrifugally separating and adsorbing the essence-adsorbed activated carbon, respectively washing the mixture for 5 times by using 75% ethanol and distilled water until the solid is neutral, and naturally drying the mixture to obtain the essence-adsorbed activated carbon.
Example 5 sensory evaluation
The common activated carbon and the hydrochloric acid modified activated carbon prepared by the method disclosed by 2014108433986.6 and the activated carbon (acid modified activated carbon + carbon quantum dots) obtained in example 1 were added to cigarette filters after adsorbing menthol respectively, and the results were shown in table 1.
TABLE 1 sensory evaluation of various activated carbons used in cigarette filters
Figure BDA0001854274010000061
Figure BDA0001854274010000071
EXAMPLE 6 measurement of Release amount and Release Rate
The release amount and release rate of the essence-adsorbing activated carbon obtained in examples 1 to 4 were measured (see Table 2 for the results)
(1) And (3) machine-loading experiment: cigarette samples, each 5 cigarettes, containing 10mg of the essence-adsorbing activated carbon prepared in examples 1 to 4, respectively, in a filter tip were put into a smoking machine to perform a smoking experiment according to a standard method.
(2) The release amount is as follows: taking out the filter disc of the catcher, putting the filter disc into a steamed bun bottle filled with 50mL of extracting agent, performing oscillation extraction for 30min, then sampling and performing gas chromatography analysis, and calculating the content of menthol or vanillin in the particulate matters of the mainstream smoke according to the result, namely the release amount of the material to the menthol or vanillin in the mainstream smoke.
(3) The release rate is as follows: and (3) taking out a sample material (a material added in the preparation of the sample cigarette) in the residual cigarette ends, adding the sample material into a steamed bun bottle containing 50mL of an extracting agent, performing oscillation extraction for 30min, sampling, performing gas chromatography analysis, and obtaining the adsorbent residual content of the menthol or the vanillin according to the result, thereby calculating the release rate%.
Release rate = (addition amount-adsorbent residual content) (mg)/addition amount (mg)
TABLE 2 Release Rate of menthol or vanillin from cigarette with different activated carbons
Figure BDA0001854274010000072
The table shows that the release rate of the modified activated carbon to the essence is high and is over 85 percent, the essence released by the material is mainly intercepted by the filter tip, and the intercepted essence content accounts for about 30 percent of the total content. The release amount of the menthol of the domestic cigarette is 0.02-0.06mg/cig at present, and the release amount of the menthol of the foreign cigarette is 0.06-0.6 mg/cig. The test result of the invention shows that the release amount of the modified activated carbon material to menthol or vanillin can reach the international cigarette level.

Claims (7)

1. A method for improving the essence slow release performance of activated carbon is characterized by comprising the following steps:
(1) preparing carbon quantum dots;
(2) acidifying the activated carbon;
(3) preparing liquid essence;
(4) mixing the acidified active carbon prepared in the step (2), the carbon quantum dots prepared in the step (1) and the liquid essence prepared in the step (3), separating the active carbon adsorbing the essence, and drying in the air to obtain the active carbon adsorbing the essence;
wherein the method for preparing the carbon quantum dots by the step (1) comprises the following steps: dissolving 0.2-0.5g of urea phosphate, 0.3-0.6g of citric acid and 0.8-1.0mL of ethylenediamine in 25-50mL of deionized water; then placing the obtained solution in a microwave digestion instrument for reaction to obtain a clear transparent solution, centrifuging, taking supernate, and drying to obtain carbon quantum dots; the reaction conditions in the microwave digestion instrument are as follows: heating to 150 ℃ within 1min, keeping the temperature unchanged, and reacting for 30min, wherein the drying temperature is 60 ℃ and the drying time is 12-24 h;
the method for acidifying the activated carbon in the step (2) comprises the following steps: taking activated carbon, adding HCl or HNO of 0.1mol/L3Soaking in the solution for 2h, placing in water bath at room temperature, shaking for 12-20h, washing with distilled water until the surface of the activated carbon is neutral, vacuum filtering, and drying at 100 deg.C for 3-6h to obtain acidified activated carbon; wherein
Activated carbon with HCl or HNO3Solution g: the weight-volume ratio of the mL is 1: 3-5.
2. The method according to claim 1, wherein the step (3) of preparing the liquid essence comprises: dissolving menthol or vanillin in absolute ethyl alcohol, and mixing the following raw materials: the weight-volume ratio of the mL is 1: 3-5.
3. The method as claimed in claim 1, wherein after the activated carbon adsorbing the essence is separated in the step (4), the solid is washed with 75% ethanol and distilled water for 3-5 times respectively until the solid is neutral.
4. The method according to claim 1, wherein the acidified activated carbon, carbon quantum dots, liquid essence g: the weight volume ratio of the mL is 1:0.03-0.05: 3-5.
5. The method of claim 1, comprising the steps of:
(1) preparing the carbon quantum dots: dissolving 0.2-0.5g of urea phosphate, 0.3-0.6g of citric acid and 0.8-1.0mL of ethylenediamine in 25-50mL of deionized water; then transferring the solution into a microwave digestion tank, sealing and placing the tank into a microwave digestion instrument; the temperature programming was set to: the reaction temperature is raised to 150 ℃ within 1min, and the temperature is kept unchanged for reaction for 30 min; after cooling to room temperature, centrifuging the obtained clear transparent solution at 10000rpm for 15min, and drying the supernatant in a vacuum drying oven at 60 ℃ for 12-24h to obtain the product;
(2) acidifying activated carbon: taking activated carbon, adding HCl or HNO of 0.1mol/L3Soaking in the solution for 2h, placing in water bath at room temperature, shaking for 12-20h, washing with distilled water until the surface of activated carbon is neutral, vacuum filtering, and drying at 100 deg.C for 3-6h to obtain the final product; wherein the activated carbon is reacted with HCl or HNO3Solution g: the weight volume ratio of mL is 1: 3-5;
(3) preparing liquid essence: dissolving menthol or vanillin in anhydrous alcohol, and mixing the following raw materials: the weight volume ratio of mL is 1: 3-5;
(4) mixing the acidified active carbon prepared in the step (2), the carbon quantum dots prepared in the step (1) and the liquid essence prepared in the step (3), placing the mixture in a shaking table for 20-24h, separating and adsorbing the essence active carbon, respectively washing the mixture for 3-5 times by using 75% ethanol and distilled water until the solid is neutral, and naturally drying the mixture to obtain the essence-adsorbed active carbon.
6. An activated carbon adsorbing essences prepared according to any one of claims 1 to 5.
7. The use of the activated carbon for adsorbing essences according to claim 6 in the preparation of cigarettes.
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