CN112971205B - Application of graphene adsorption material in reducing harmful components in cigarette smoke - Google Patents
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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
- A24D3/16—Use of materials for tobacco smoke filters of inorganic materials
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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
- A24D3/02—Manufacture of tobacco smoke filters
Abstract
The invention discloses an application of a graphene adsorption material in reducing harmful components in cigarette smoke, wherein the graphene adsorption material is prepared by activating graphene oxide with KOH and reducing the graphene oxide with hydrazine hydrate as a reducing agent, and the graphene adsorption material is added into a cigarette filter to achieve the purpose of reducing the harmful components in the cigarette; the graphene adsorption material has a good adsorption effect on benzo [ a ] pyrene, hydrogen cyanide, ammonia, crotonaldehyde, phenol and CO in smoke, is simple in preparation method and mild in reaction conditions, and the prepared adsorption material is large in specific surface area, has a stable regular hexagonal lattice structure and is easy to form acid-base conjugate interaction with a phenol compound. In addition, chemical functional groups such as carboxyl and hydroxyl on the surface of the graphene flue gas adsorption material prepared by the method can form hydrogen bonds with phenolic compounds. The additive for the cigarette filter tip can effectively reduce harmful components in smoke and has obvious tar and harm reducing effects.
Description
Technical Field
The invention relates to application of a graphene adsorption material in reducing harmful components in cigarette smoke, and belongs to the technical field of cigarettes.
Background
Cigarette smoke is an extremely complex mixture of components produced by the processes of high-temperature combustion, pyrolysis, distillation and the like during smoking of tobacco products. The tar and harm reduction is always the focus and hot spot of the international tobacco community.
At present, the world admittedly has greater influence on human health by 6 main harmful substances, namely benzo [ a ] pyrene, hydrogen cyanide, ammonia, crotonaldehyde, phenol and CO. Hydrogen cyanide is a fibrous toxin, which affects respiratory cells of the human body, and when a certain amount of hydrogen cyanide is taken into the human body, the cells are killed finally due to asphyxiation; phenol is a common bactericide and can be absorbed by respiratory tract, skin and digestive tract, low concentration phenol can denature protein, high concentration phenol can precipitate protein, has strong corrosive effect on skin and mucosa, and can inhibit damage of central nervous system to liver and kidney; ammonia gas can cause hepatic steatosis, renal interstitial inflammation and myocardial damage, low-concentration ammonia has stimulation effect on mucous membrane, and high-concentration ammonia can cause tissue lytic necrosis (i.e. saponification effect) such as tissue protein denaturation and adipose tissue saponification. Related reports show that the porous material is independently applied to the cigarette filter, has poor effect of removing harmful ingredients in cigarette smoke and low selectivity.
In the prior art, researches on removing harmful ingredients in cigarette smoke are more, mainly on two aspects, namely, on the aspect of cigarette processing technology, for example, in patent 201110241462.9, siO is added into a cigarette filter stick 2 The reduction rates of crotonaldehyde and phenol were 10.3% and 20.1%, respectively; the other is to prepare the cigarette additive, and add the cigarette additive into the filter to achieve the purpose of adsorption, for example, in the patent 200710034453.6, the reduction rate of phenol can only reach 31 percent by adding modified activated carbon fiber into the cigarette filter; sunyufeng, etc. uses MMM as additive of cigarette filter tip and p-benzo [ a ]]The reduction rates of pyrene, crotonaldehyde and phenol were: 26.25%, 8.15%, 43.40%, obviously, the reduction rate is to be improved. In addition, in patent CN201410134481, ammonia adsorption can reach more than 30%, but the addition amount of the material in the patent is more than 40mg, and too much amount of the material added in the filter tip affects suction resistance and is not beneficial to suction.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a new application of a graphene adsorption material, namely the application of the graphene adsorption material in reducing harmful components in cigarette smoke, the graphene adsorption material is prepared by activating graphene oxide with KOH and reducing the graphene oxide with hydrazine hydrate as a reducing agent on the premise of not changing cigarette formula components, and the graphene adsorption material is used as an adsorbent and added to 2/3 positions of a cigarette filter tip, has large specific surface area and adjustable pore diameter, has a stable regular hexagonal lattice structure, and is easy to form acid-base conjugate interaction with a phenol compound, so that the graphene adsorption material has obvious adsorption on the harmful components of benzo [ a ] pyrene, hydrogen cyanide, ammonia, crotonaldehyde, phenol and CO in the cigarette smoke, the benzo [ a ] pyrene reduction rate can reach more than 20%, the hydrogen cyanide reduction rate can reach more than 58%, the ammonia reduction rate can reach more than 37%, the crotonaldehyde reduction rate can reach more than 37%, the phenol reduction rate can reach more than 50%, and the CO reduction rate can reach more than 11%.
The preparation method of the graphene adsorption material comprises the following steps:
(1) Adding flake graphite into a mixed solution of hydrochloric acid and hydrofluoric acid, stirring and reacting for 2-5h, carrying out solid-liquid separation, washing and drying a solid to obtain pretreated graphite, oxidizing and dehydrating the pretreated graphite at 50-80 ℃ by concentrated sulfuric acid containing phosphorus pentoxide and potassium persulfate, carrying out solid-liquid separation, washing and drying the solid to obtain pre-oxidized graphite, sequentially adding the pre-oxidized graphite, sodium nitrate and potassium permanganate into the concentrated sulfuric acid, then placing the mixture in a water bath at 0-35 ℃ and stirring and reacting for 4-10h, carrying out solid-liquid separation, washing the solid by hydrochloric acid and deionized water in sequence until the pH is 7, drying, adding water into the solid, and carrying out ultrasonic dispersion to obtain a graphene oxide suspension;
the hydrochloric acid-hydrofluoric acid mixed solution is prepared by mixing hydrochloric acid and hydrofluoric acid according to the volume ratio (0.5 to 1) to 1;
the concentration of the phosphorus pentoxide in concentrated sulfuric acid is 75-150g/L, the concentration of potassium persulfate in the concentrated sulfuric acid is 75-150g/L, the mass ratio of the concentrated sulfuric acid containing the phosphorus pentoxide and the potassium persulfate to the pretreated graphite is (0.5-1): 0.5-1, and the concentrated sulfuric acid is a conventional commercial product;
the mass ratio of concentrated sulfuric acid to pre-oxidized graphite is (0.5-1) - (0.5-1), and the mass ratio of pre-oxidized graphite to sodium nitrate to potassium permanganate is (1-1.5) to 1 (1-6);
(2) Adding KOH into the graphene oxide suspension, and stirring in a water bath at the temperature of 25 to 40 ℃ for 1 to 2.5h;
the mass ratio of the KOH to the graphene oxide is 1 (2-5);
(3) Adding ammonia water into the suspension after stirring in the step (2) to adjust the pH to 2 to 6, then adding hydrazine hydrate, stirring and reacting for 4 to 8h under an oil bath at 55 to 95 ℃, after the reaction is finished, carrying out solid-liquid separation, washing the solid to be neutral by using deionized water and absolute ethyl alcohol in sequence, and carrying out vacuum drying to obtain the graphene adsorbing material; the mass ratio of the graphene oxide to the hydrazine hydrate is (0.5-1) to 4.
The graphene adsorption material is used as a cigarette additive, the graphene smoke adsorption material is added to 2/3 of the cigarette filter, harmful ingredients in the cigarette smoke can be reduced, and the addition amount of the graphene adsorption material in the cigarette filter is 5-20 mg/cigarette.
The harmful components in the cigarette smoke comprise benzo [ a ] pyrene, hydrogen cyanide, ammonia, crotonaldehyde, phenol and CO.
The technical scheme of the invention has the following advantages:
(1) According to the invention, on the premise of not changing cigarette formula components, the graphene adsorption material is added to 2/3 of the cigarette filter as an adsorbent. The graphene adsorption material is large in specific surface area, adjustable in pore size, stable in regular hexagonal lattice structure and easy to form acid-base conjugate interaction with a phenol compound, so that the graphene adsorption material has obvious adsorption on harmful components of benzo [ a ] pyrene, hydrogen cyanide, ammonia, crotonaldehyde, phenol and CO in cigarette smoke, the benzo [ a ] pyrene reduction rate can reach more than 23%, the hydrogen cyanide reduction rate can reach more than 58%, the ammonia reduction rate can reach more than 37%, the crotonaldehyde reduction rate can reach more than 37%, the phenol reduction rate can reach more than 50%, and the CO reduction rate can reach more than 11%;
(2) According to the invention, the graphene flue gas adsorption material is prepared by a KOH activation method, the preparation process is simple and easy to operate, the pollution of waste liquid generated in the graphene preparation process to the environment is effectively avoided, and the reproducibility is good;
(3) Chemical functional groups such as carboxyl and hydroxyl on the surface of the graphene flue gas adsorption material prepared by the invention can form hydrogen bonds with phenolic compounds;
(4) After the graphene smoke material prepared by the invention is used for preparing a composite filter tip in a cigarette filter tip, the graphene smoke material has a good adsorption effect on harmful components in cigarette smoke, and the material is determined not to migrate along with the smoke through material migration detection, so that the graphene smoke material has good safety.
Drawings
FIG. 1 shows N in a graphene adsorbent 2 Adsorption-desorption curve (a) and pore size distribution (b).
Detailed Description
The present invention is further illustrated by the following examples, but the scope of the invention is not limited thereto.
Example 1: the preparation method of the graphene adsorption material comprises the following steps:
(1) Adding crystalline flake graphite into a single-neck flask filled with a hydrochloric acid-hydrofluoric acid mixture (volume ratio is 0.5); adding pre-oxidized graphite, sodium nitrate and potassium permanganate into concentrated sulfuric acid in sequence, then placing the mixture into a water bath at 0 ℃ to perform stirring reaction for 10 hours, wherein the mass ratio of the concentrated sulfuric acid to the pre-oxidized graphite is 1.75, the mass ratio of the pre-oxidized graphite to the sodium nitrate to the potassium permanganate is 1;
(2) Adding KOH into the graphene oxide suspension, and then placing the graphene oxide suspension in a water bath at 25 ℃ to stir for 1.5h, wherein the mass ratio of KOH to graphene oxide is 1;
(3) Adding ammonia water into the stirred solution to adjust the pH value of the system to be 3, adding hydrazine hydrate into the suspension, stirring and reacting for 5 hours under the condition of oil bath at 95 ℃, carrying out solid-liquid separation after the reaction is finished, washing the solid to be neutral by using deionized water and absolute ethyl alcohol in sequence, and carrying out vacuum drying for 8 hours at 60 ℃ to obtain the graphene flue gas adsorption material; wherein the mass ratio of the graphene oxide to the hydrazine hydrate is 0.5;
n was applied to the adsorbent of this example 2 The adsorption-desorption test is carried out, the BET theory is adopted for the specific surface area, the BJH model is adopted for calculating the pore size distribution, and the specific surface area of the adsorbing material in the embodiment is 604.9m 2 Per g, pore volume 0.852cm 3 (iv)/g, average pore diameter of 6.02nm;
grinding and sieving the graphene adsorbing material prepared in the embodiment to 40-60 meshes, uniformly and flatly adding the adsorbing material to 2/3 of a cigarette filter, wherein the adding amount is 20mg per cigarette, and finally preparing a cigarette product. Taking blank cigarettes without the graphene adsorption material as a reference, testing 6 cigarettes in each sample, setting 2 groups of parallel samples, and collecting smoke components by using a trap with a built-in Cambridge filter disc. Before the experiment, all samples and Cambridge filter discs are placed in a constant temperature and humidity balance box with the temperature of 20 +/-2 ℃ and the humidity of 60 +/-2% for 48 hours, and the contents of benzo [ a ] pyrene, hydrogen cyanide, ammonia, crotonaldehyde, phenol and CO in cigarette smoke passing through a filter tip are respectively measured by using a British Sirullin SM450 type linear smoking machine according to a method specified in GB/T19609-2004; compared with a blank group, in the cigarette added with the graphene adsorbing material, the benzo [ a ] pyrene in the smoke of the cigarette is reduced by 32.63%, the hydrogen cyanide is reduced by 63.21%, the ammonia is reduced by 42.91%, the crotonaldehyde is reduced by 37.60%, the phenol is reduced by 53.99%, and the CO is reduced by 11.71%; meanwhile, crAPO-5 in the CN108187603A is used as an additive of the cigarette filter tip, 20mg is added under the same condition for comparison, and the comparison result is shown in a table 1;
TABLE 1 reduction of harmful substances in cigarette smoke
Example 2: the preparation method of the graphene adsorption material comprises the following steps:
(1) Adding the crystalline flake graphite into a single-neck flask filled with a hydrochloric acid-hydrofluoric acid mixture (volume ratio is 1; adding pre-oxidized graphite, sodium nitrate and potassium permanganate into concentrated sulfuric acid in sequence, and then placing the mixture in a water bath at 15 ℃ to perform stirring reaction for 8 hours, wherein the mass ratio of the concentrated sulfuric acid to the pre-oxidized graphite is 1; after the reaction is finished, carrying out solid-liquid separation, washing the solid with hydrochloric acid and deionized water in sequence until the pH value is 7, freeze-drying, adding water into the solid, and carrying out ultrasonic dispersion to obtain a graphene oxide suspension;
(2) Adding KOH into the graphene oxide suspension, and then placing the graphene oxide suspension into a water bath at 30 ℃ to stir for 2.5h, wherein the mass ratio of KOH to graphene oxide is 1;
(3) Adding ammonia water into the stirred solution to adjust the pH value of the system to be 5, adding hydrazine hydrate into the suspension, stirring and reacting for 5 hours under an oil bath at 85 ℃, after the reaction is finished, carrying out solid-liquid separation, washing the solid to be neutral by using deionized water and absolute ethyl alcohol in sequence, and carrying out vacuum drying for 8 hours at 60 ℃ to obtain the graphene flue gas adsorption material; wherein the mass ratio of the graphene oxide to the hydrazine hydrate is 0.75;
n was applied to the adsorbent of this example 2 The adsorption-desorption test is carried out, the BET theory is adopted for the specific surface area, the BJH model is adopted for calculating the pore size distribution, and the specific surface area of the adsorption material in the embodiment is 623.2m 2 Per g, pore volume of 0.939cm 3 (iv)/g, average pore diameter of 6.31nm;
grinding and sieving the graphene adsorbing material prepared in the embodiment to 40-60 meshes, uniformly and flatly adding the adsorbing material to 2/3 of a cigarette filter, wherein the adding amount is 5mg per cigarette, and finally preparing a cigarette product. And (3) taking blank cigarettes without the graphene smoke adsorbing material as a control, testing 6 cigarettes in each sample, setting 2 groups of parallel samples, and collecting smoke components by using a catcher with a built-in Cambridge filter disc. Before the experiment, all samples and Cambridge filter discs are placed in a constant temperature and humidity balance box with the temperature of 20 +/-2 ℃ and the humidity of 60 +/-2% for 48 hours, and the contents of benzo [ a ] pyrene, hydrogen cyanide, ammonia, crotonaldehyde, phenol and CO in cigarette smoke passing through a filter tip are respectively measured by using a British Sirullin SM450 type linear smoking machine according to a method specified in GB/T19609-2004; the cigarette added with the graphene material reduces 23.18% of benzo [ a ] pyrene, 59.09% of hydrogen cyanide, 37.40% of ammonia, 42.07% of crotonaldehyde, 51.57% of phenol and 25.90% of CO in cigarette smoke, and compared with microporous mesoporous composite materials (MMM) prepared by other researchers in the field, the cigarette added amount of 5mg in each cigarette is shown in Table 2 in the comparison result under the same condition;
TABLE 2 reduction of harmful substances in cigarette smoke
Example 3: the preparation method of the graphene flue gas adsorption material sample 3 is as follows:
(1) Adding the crystalline flake graphite into a single-neck flask filled with a hydrochloric acid-hydrofluoric acid mixture (volume ratio of 0.75); adding pre-oxidized graphite, sodium nitrate and potassium permanganate into concentrated sulfuric acid in sequence, and then placing the mixture in a water bath at 25 ℃ to stir and react for 6 hours, wherein the mass ratio of the concentrated sulfuric acid to the pre-oxidized graphite is 0.5; after the reaction is finished, carrying out solid-liquid separation, washing the solid with hydrochloric acid and deionized water in sequence until the pH value is 7, freeze-drying, adding water into the solid, and carrying out ultrasonic dispersion to obtain a graphene oxide suspension;
(2) Adding KOH into the graphene oxide suspension, and then placing the graphene oxide suspension in a water bath at 40 ℃ to stir for 1h, wherein the mass ratio of KOH to graphene oxide is 1;
(3) Adding ammonia water into the stirred solution to adjust the pH value of the system to be 6, adding hydrazine hydrate into the suspension, stirring and reacting for 5 hours under the condition of oil bath at 65 ℃, carrying out solid-liquid separation after the reaction is finished, washing the solid to be neutral by using deionized water and absolute ethyl alcohol in sequence, and carrying out vacuum drying for 8 hours at 60 ℃ to obtain the graphene flue gas adsorption material; wherein the mass ratio of the graphene oxide to the hydrazine hydrate is 1;
n was applied to the adsorbent of this example 2 In the adsorption-desorption test, the BET theory is adopted as the specific surface area, the BJH model is adopted for calculating the pore size distribution, and the specific surface area of the adsorbing material in the embodiment is 603.5m 2 Per g, pore volume of 0.855cm 3 (ii)/g, average pore diameter 5.94nm;
grinding and sieving the graphene adsorbing material sample 3 prepared in the embodiment to 40-60 meshes, uniformly and flatly adding the adsorbing material to 2/3 of the cigarette filter, wherein the adding amount is 10mg per cigarette, and finally preparing the cigarette product. Taking blank cigarettes without the graphene adsorption material as a reference, testing 6 cigarettes in each sample, setting 2 groups of parallel samples, and collecting smoke components by using a trap with a built-in Cambridge filter disc. Before the experiment, all samples and the Cambridge filter disc are placed in a constant temperature and humidity balance box with the temperature of 20 +/-2 ℃ and the humidity of 60 +/-2% for 48 hours, the contents of benzo [ a ] pyrene, hydrogen cyanide, ammonia, crotonaldehyde, phenol and CO in cigarette smoke passing through a filter tip are respectively measured by using a British Silrin SM450 type linear smoking machine according to a method specified by GB/T19609-2004, and the cigarette added with the graphene material reduces 37.67% of benzo [ a ] pyrene, 58.91% of hydrogen cyanide, 48.69% of ammonia, 43.72% of crotonaldehyde, 76.58% of phenol and 20.68% of CO in the cigarette smoke. In patent CN107416857B, coAPO-11 is used as an additive of a cigarette filter under the same conditions, and the reduction rate comparison results are shown in Table 3;
TABLE 3 reduction of harmful substances in cigarette smoke
Example 4: the preparation method of the graphene adsorption material comprises the following steps:
(1) Adding the crystalline flake graphite into a single-neck flask filled with a hydrochloric acid-hydrofluoric acid mixture (volume ratio of 0.8); adding pre-oxidized graphite, sodium nitrate and potassium permanganate into concentrated sulfuric acid in sequence, and then placing the mixture in a water bath at 35 ℃ to perform stirring reaction for 4 hours, wherein the mass ratio of the concentrated sulfuric acid to the pre-oxidized graphite is 1; after the reaction is finished, carrying out solid-liquid separation, washing the solid with hydrochloric acid and deionized water in sequence until the pH value is 7, carrying out freeze drying, adding water into the solid, and carrying out ultrasonic dispersion to obtain a graphene oxide suspension;
(2) Adding KOH into the graphene oxide suspension, and then placing the graphene oxide suspension in a water bath at 35 ℃ to stir for 2h, wherein the mass ratio of KOH to graphene oxide is 1;
(3) Adding ammonia water into the stirred solution to adjust the pH value of the system to be 5, adding hydrazine hydrate into the suspension, stirring and reacting for 8 hours under the condition of an oil bath at 55 ℃, carrying out solid-liquid separation after the reaction is finished, washing the solid to be neutral by using deionized water and absolute ethyl alcohol in sequence, and carrying out vacuum drying for 8 hours at 60 ℃ to obtain the graphene flue gas adsorption material; wherein the mass ratio of the graphene oxide to the hydrazine hydrate is 0.8;
n was applied to the adsorbent of this example 2 The adsorption-desorption test is carried out, the BET theory is adopted as the specific surface area, the BJH model is adopted for calculating the pore size distribution, and the specific surface area of the adsorption material in the embodiment is 655.1m 2 Per g, pore volume of 1.069cm 3 In terms of a/g, the mean pore diameter is 6.26nm. Obtained N 2 The adsorption-desorption curve and the pore diameter distribution diagram are shown in figure 1, and as can be seen from figure 1, the adsorption-desorption curve belongs to a type IV isotherm, the adsorption-desorption hysteresis phenomenon is obvious, and the hysteresis loop belongs to H 3 The mesoporous pore channel is a slit-shaped pore, and the structure is favorable for trapping part of harmful components in smoke in the pore channel and has a good effect of reducing harmful substances;
grinding and sieving the graphene adsorption material prepared in the embodiment to 40-60 meshes, uniformly and flatly adding the adsorption material to 2/3 of a cigarette filter tip, wherein the addition amount is 15mg per cigarette, finally preparing a cigarette product, testing 6 cigarettes in each sample by taking a blank cigarette without the graphene smoke adsorption material as a reference, setting 2 groups of parallel samples, and collecting smoke components by using a catcher with a built-in Cambridge filter. All samples and Cambridge filter plates are placed in a constant temperature and humidity balance box with the temperature of 20 +/-2 ℃ and the humidity of 60 +/-2% for 48 hours before experiments, the contents of benzo [ a ] pyrene, hydrogen cyanide, ammonia, crotonaldehyde, phenol and CO in cigarette smoke passing through a filter tip are respectively measured by using a British Sirullin SM450 type linear smoking machine according to a method specified in GB/T19609-2004, and the content of benzo [ a ] pyrene, hydrogen cyanide, ammonia, 56.43%, crotonaldehyde, 46.59%, phenol, 83.69% and CO 38.12% in the cigarette smoke added with a graphene material are reduced. Under the same conditions, compared with mesoporous titanium phosphate materials prepared by other researchers in the field, the comparative results are shown in table 4;
TABLE 4 reduction rate of harmful substances in cigarette smoke
Claims (7)
1. The application of the graphene adsorption material in reducing harmful components in cigarette smoke is characterized in that: the graphene adsorption material is prepared by activating graphene oxide with KOH and reducing the graphene oxide with hydrazine hydrate as a reducing agent, and is added into a cigarette filter to achieve the purpose of reducing harmful components in cigarettes;
the preparation method of the graphene adsorption material comprises the following steps:
(1) Adding crystalline flake graphite into a mixed solution of hydrochloric acid and hydrofluoric acid, stirring and reacting for 2-5h, carrying out solid-liquid separation, washing and drying solids to obtain pretreated graphite, oxidizing and dehydrating the pretreated graphite at 50-80 ℃ by concentrated sulfuric acid containing phosphorus pentoxide and potassium persulfate, carrying out solid-liquid separation, washing and drying the solids to obtain pre-oxidized graphite, sequentially adding the pre-oxidized graphite, sodium nitrate and potassium permanganate into the concentrated sulfuric acid, then placing the mixture into a water bath at 0-35 ℃ and stirring and reacting for 4-10h, carrying out solid-liquid separation, washing the solids to pH 7 by hydrochloric acid and deionized water in sequence, drying, adding water into the solids, and carrying out ultrasonic dispersion to obtain a graphene oxide suspension;
(2) Adding KOH into the graphene oxide suspension, and stirring in a water bath at the temperature of 25 to 40 ℃ for 1 to 2.5h;
(3) Adding ammonia water into the suspension after stirring in the step (2) to adjust the pH to 2 to 6, then adding hydrazine hydrate, stirring and reacting for 4 to 8 hours at the temperature of 55 to 95 ℃ in an oil bath, after the reaction is finished, carrying out solid-liquid separation, washing the solid to be neutral by using deionized water and absolute ethyl alcohol in sequence, and carrying out vacuum drying to obtain the graphene adsorption material;
harmful components in the cigarette include benzo [ a ] pyrene, hydrogen cyanide, ammonia, crotonaldehyde, phenol and CO.
2. Use according to claim 1, characterized in that: the mixed solution of hydrochloric acid and hydrofluoric acid is prepared by mixing hydrochloric acid and hydrofluoric acid according to the volume ratio (0.5 to 1) to 1.
3. Use according to claim 1, characterized in that: the concentration of phosphorus pentoxide in concentrated sulfuric acid is 75-150g/L, the concentration of potassium persulfate in concentrated sulfuric acid is 75-150g/L, and the mass ratio of concentrated sulfuric acid containing phosphorus pentoxide and potassium persulfate to pretreated graphite is (0.5-1): 0.5-1.
4. Use according to claim 1, characterized in that: the mass ratio of concentrated sulfuric acid to pre-oxidized graphite is (0.5 to 1): (0.5 to 1), and the mass ratio of pre-oxidized graphite to sodium nitrate to potassium permanganate is (1 to 1.5): 1 to 6).
5. Use according to claim 1, characterized in that: the mass ratio of KOH to graphene oxide is 1 (2 to 5).
6. Use according to claim 1, characterized in that: the mass ratio of the graphene oxide to the hydrazine hydrate is (0.5 to 1) to 4.
7. Use according to claim 1, characterized in that: the addition amount of the graphene adsorption material in the cigarette filter is 5-20 mg/cigarette.
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