CN108686653B - Preparation method and application of bimetallic nano-catalyst for reducing CO release amount of cigarette smoke - Google Patents
Preparation method and application of bimetallic nano-catalyst for reducing CO release amount of cigarette smoke Download PDFInfo
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Images
Classifications
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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
- B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
- B01J23/38—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals
- B01J23/48—Silver or gold
- B01J23/52—Gold
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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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- 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
- B01J31/00—Catalysts comprising hydrides, coordination complexes or organic compounds
- B01J31/02—Catalysts comprising hydrides, coordination complexes or organic compounds containing organic compounds or metal hydrides
- B01J31/06—Catalysts comprising hydrides, coordination complexes or organic compounds containing organic compounds or metal hydrides containing polymers
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- B01J35/23—
Abstract
The invention belongs to the technical field of cigarette harm reducing materials, and relates to a preparation method and application of a bimetallic nano-catalyst for reducing CO release amount of cigarette smoke. The gold/silver alloy nano material is prepared by taking lysimachia christinae hance polysaccharide as a stabilizing agent and a reducing agent, chelating and adsorbing metal precursor ions by utilizing rich functional groups in lysimachia christinae hance polysaccharide molecules, and simultaneously utilizing the reduction action of the polysaccharide molecules under the alkaline condition and carrying out a metal precursor ion sequential reduction method. The filter tip made by adding the gold/silver bimetallic nano-catalyst into acetate fiber tow can effectively reduce the CO release amount in cigarette smoke by 6-21.6%. The preparation method of the bimetallic nano-catalyst for reducing the CO release in the cigarette smoke is green, environment-friendly, simple and feasible, has the synergistic catalytic effect of bimetallic nano, and is high in catalytic activity and less in filter tip adding amount.
Description
Technical Field
The invention relates to the technical field of cigarette harm reduction materials, in particular to a preparation method and application of a bimetallic nano-catalyst for reducing CO release amount of cigarette smoke.
Background
The problems of smoking and health are strongly concerned by society, and CO is one of main harmful components in cigarette smoke and is easy to combine with hemoglobin in a human body to cause hypoxia and induce various diseases. The development of new materials/new technology research for reducing the release amount of CO in cigarette smoke has become a focus of attention of tobacco researchers and has practical significance for researching and developing low-harm high-quality cigarettes.
The method for reducing the release amount of CO in the mainstream smoke of the cigarette mainly comprises the steps of filter punching dilution, cigarette paper characteristic adjustment, tobacco shred formula adjustment, tobacco shred/filter additive addition and the like. Recently, with the continuous progress of nano technology, the reduction of CO release in cigarette smoke by utilizing the excellent catalytic performance of nano materials is considered to be an economical and effective method. The nano-catalyst can be added into the filter tip, and when CO in the mainstream smoke contacts the surface of the catalyst, the CO can be catalytically oxidized into carbon dioxide; the nano catalyst can also be added into cigarette paper or tobacco shreds, plays a catalytic role in the burning process of the cigarette, improves the burning efficiency and reduces CO generated by insufficient burning of the tobacco shreds. For example, world patent WO2006/046145 discloses a method for preparing Au/CeO by deposition-precipitation2The catalyst is added into the cut tobacco, cigarette paper or filter tip, and can effectively reduce the release amount of CO in the smoke. US7243658 discloses a silica-supported gold nanocatalyst which can reduce CO release by more than 10% when added to tobacco shreds. Chinese patent CN102218327B discloses a transition metal-manganese composite oxide catalyst which is added into a filter tip made by rolling acetate fiber tows, and can reduce the CO release amount by 4-11%.
The preparation process of the supported nano catalyst for reducing CO release in cigarette smoke is complex and long in time consumption, generally needs organic solvent/strong acid and strong base reagent and high-temperature roasting operation, and inevitably loses part of active catalytic surface in the loading process. Therefore, a green and simple preparation method of the nano material with higher catalytic activity for CO in the cigarette smoke is explored, so that the cigarette harm can be reduced, and unnecessary environmental pollution is avoided.
Disclosure of Invention
The invention provides a preparation method and application of a bimetallic nano-catalyst for reducing CO release amount of cigarette smoke in order to solve the technical problems. The invention takes the lysimachia christinae hance polysaccharide as a reducing agent and a stabilizing agent, utilizes rich functional groups in the lysimachia christinae hance polysaccharide molecules to chelate and adsorb metal precursor ions, and simultaneously utilizes the reduction action of the polysaccharide molecules under the alkaline condition to sequentially reduce silver ions and gold ions into the gold/silver bimetallic nano catalyst.
The technical scheme of the invention is realized as follows:
a preparation method of a bimetallic nano-catalyst for reducing CO release amount of cigarette smoke comprises the following steps:
(1) dispersing the lysimachia christinae hance polysaccharide in water, heating and stirring until the lysimachia christinae hance polysaccharide is dissolved, and removing impurity crystal nucleus by vacuum filtration to obtain a lysimachia christinae hance polysaccharide solution;
(2) preparing chloroauric acid solution and silver nitrate water solution with the concentration of 1-10 mM;
(3) mixing the silver nitrate aqueous solution prepared in the step (2) with the desmodium polysaccharide solution obtained in the step (1) under the condition of stirring, adjusting the pH to 11-13 by using a sodium hydroxide solution with the concentration of 1M, and oscillating the mixture in a shaking table at 50 ℃ for 0.5-1.5 hours to obtain a mixed solution;
(4) dropwise adding the chloroauric acid solution prepared in the step (2) into the mixed solution obtained in the step (3), and continuously oscillating in a shaking table at 50 ℃ for 0.5-1.5 hours to obtain gold/silver alloy nano solution with stable lysimachia polysaccharide;
(5) and (4) centrifugally separating the gold/silver alloy nano solution obtained in the step (4) to obtain a gold/silver alloy nano catalyst, freeze-drying the gold/silver alloy nano catalyst, and re-dispersing the gold/silver alloy nano catalyst in an ethanol solution to ensure that the concentration of the gold/silver alloy nano catalyst is 1-2 mg/mL to obtain the bimetallic nano catalyst dispersion liquid.
The concentration of the pennywort polysaccharide solution in the step (1) is 3-8 mg/mL.
The volume ratio of the silver nitrate aqueous solution to the desmodium polysaccharide solution in the step (3) is 1 (8-12).
Au in the gold/silver alloy nano solution in the step (5)3+With Ag+The molar ratio is (1-9) to 3.
The centrifugal separation rotating speed in the step (5) is 8000-12000 rpm, and the time is 10-20 minutes.
The application of the bimetallic nano-catalyst for reducing the CO release amount of the cigarette smoke comprises the following steps: and in the opening and forming stage of the acetate fiber tows of the filter stick, spraying the dispersion liquid of the bimetallic nano-catalyst on the surfaces of the tows to prepare the filter stick containing the bimetallic nano-catalyst, and connecting the filter stick and the cigarette to finish the preparation of the low CO cigarette.
The filter tip of the cigarette contains the bimetallic nano-catalyst with the mass of 0.05-0.3 mg.
The application of the bimetallic nano-catalyst for reducing the CO release amount of the cigarette smoke comprises the following steps: injecting the bimetallic nano catalyst dispersion liquid into the cigarette filter tip by a micro injector, wherein the injection amount of each cigarette is 0.05-0.3mL, and then placing the cigarette in a constant temperature and humidity box under the standard balance condition for balancing for 2 days.
The invention has the beneficial effects that:
1. the principle of the gold/silver bimetallic nano-catalyst for synthesizing and reducing CO release provided by the invention is as follows: the gold/silver bimetallic nano-catalyst which is stably dispersed is synthesized by taking the lysimachia christinae hance polysaccharide as a stabilizing agent and a reducing agent through a metal ion sequential reduction method; the synthesis process fully utilizes rich functional groups in the herba lysimachiae polysaccharide molecular structure to chelate and adsorb metal precursor ions, simultaneously utilizes the reduction action of polysaccharide molecules under the alkaline condition to sequentially reduce silver ions and gold ions, the bimetallic nano-catalyst has synergistic effect when catalyzing and oxidizing CO, has high catalytic activity, and can catalyze and oxidize CO in mainstream smoke into CO2Thereby reducing the amount of CO released.
2. The preparation method of the bimetallic nano-catalyst for reducing CO release in cigarette smoke is green, environment-friendly, simple and feasible, avoids operations such as high-temperature calcination, addition of a reducing agent and the like, and the polysaccharide-coated nano-catalyst has good stability and convenient element composition regulation.
3. The gold/silver bimetallic nano-catalyst with stable lysimachia polysaccharide can effectively reduce CO release in cigarette smoke, has the synergistic catalytic effect of bimetallic nano, and has the advantages of small filter tip adding amount, high catalytic activity and 6-21.6% reduction ratio of CO release amount.
4. The gold/silver bimetallic nano-catalyst provided by the invention is stabilized by the lysimachia christinae hance polysaccharide, and has no negative influence on the smoking taste and style characteristics of cigarettes while reducing CO release.
Drawings
FIG. 1 is a photograph a) and a UV spectrum b) of a gold/silver bimetallic nanodispersion prepared in example 1.
FIG. 2 is the transmission electron microscope picture and the energy spectrum scan of the gold/silver bimetallic nanometer prepared in example 2.
FIG. 3 is an X-ray photoelectron spectrum of gold/silver bimetallic nanomaterial prepared in example 2.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments of the present invention, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without inventive effort based on the embodiments of the present invention, are within the scope of the present invention.
Example 1
The embodiment provides a preparation method of a bimetallic nano-catalyst for reducing CO release amount of cigarette smoke, which comprises the following steps:
(1) the lysimachia christinae hance polysaccharide is dispersed in water, stirred and heated to be fully dissolved to make the concentration of the lysimachia christinae hance polysaccharide be 5mg/mL, and vacuum-filtered to remove impurity crystal nucleus.
(2) Preparing chloroauric acid and silver nitrate water solution, wherein the concentration of each solution is 10 mM.
(3) Mixing 2mL of silver nitrate solution obtained in the step (2) with the lysimachia christinae hance polysaccharide solution obtained in the step (1) under the condition of stirring, wherein the volume ratio of the silver nitrate solution to the lysimachia christinae hance polysaccharide solution is 1:10, adding 1mL of sodium hydroxide solution and 1M to adjust the solution to be alkaline, and then placing the mixture in 50oC shaking the mixture in a shaker for 1 hour.
(4) Dropwise adding 2mL of chloroauric acid solution in the step (2) into the mixed solution obtained in the step (3), and continuing to add 50oC, oscillating in a shaking table for 1 hour to obtain the gold/silver alloy nano solution with stable lysimachia polysaccharide.
(5) Centrifuging the alloy nano dispersion liquid obtained in the step (4) at 9000rpm for 17 minutes, removing redundant desmodium polysaccharide and sodium hydroxide in the solution, freeze-drying the alloy nano particles obtained by centrifugation, and re-dispersing the alloy nano particles in an ethanol solution to make the concentration of the alloy nano particles be 1.0 mg/mL.
The photo and ultraviolet spectrogram of the obtained gold/silver bimetallic nano dispersion liquid are shown in figure 1, and as a contrast, the ultraviolet spectrogram gives the absorption spectrum of the single-metal gold and silver nano material obtained by the same method, and the peak position of the ultraviolet absorption spectrum can be known, so that the obtained nano material is the gold/silver bimetallic nano catalyst.
The application of the bimetallic nano-catalyst for reducing the CO release amount of cigarette smoke comprises the following steps:
dispersing the gold/silver bimetallic nano-catalyst on the surface of an acetate fiber tow to prepare a filter stick containing the bimetallic nano-catalyst, balancing for 2 days, wherein the average mass of the catalyst in each filter tip is 0.3mg, and connecting the filter stick with a cigarette. And testing the CO release amount in the main stream smoke by using a smoking machine, and taking an average value of 20 cigarettes.
The influence of the gold/silver bimetallic nano-catalyst on CO release in cigarette smoke is evaluated by taking cigarettes of the same brand without the catalyst as a control sample, and the results are shown in the following table:
example 2
The embodiment provides a preparation method of a bimetallic nano-catalyst for reducing CO release amount of cigarette smoke, which comprises the following steps:
(1) the lysimachia christinae hance polysaccharide is dispersed in water, stirred and heated to be fully dissolved to make the concentration of the lysimachia christinae hance polysaccharide be 5mg/mL, and vacuum-filtered to remove impurity crystal nucleus.
(2) Preparing chloroauric acid and silver nitrate water solution, wherein the concentration of each solution is 5 mM.
(3) Mixing 2mL of silver nitrate solution obtained in the step (2) with the lysimachia christinae hance polysaccharide solution obtained in the step (1) under the condition of stirring, wherein the volume ratio of the silver nitrate solution to the lysimachia christinae hance polysaccharide solution is 1:12, adding 0.1mL of sodium hydroxide solution and 1M of the sodium hydroxide solution to adjust the solution to be alkaline, and then placing the mixed solution in a 50-inch containeroC shaking the mixture in a shaker for 0.5 hour.
(4) Dropwise adding 0.66mL of chloroauric acid solution in the step (2) into the mixed solution obtained in the step (3), and continuing to add 50oC, oscillating and reacting for 1.5 hours in a shaking table to obtain the gold/silver alloy nano solution with stable lysimachia polysaccharide.
(5) And (3) centrifuging the alloy nano dispersion liquid obtained in the step (4) at 10000rpm for 15 minutes, removing redundant lysimachia polysaccharide and sodium hydroxide in the solution, freeze-drying the alloy nano particles obtained by centrifugation, and then re-dispersing the alloy nano particles in an ethanol solution to enable the concentration of the alloy nano particles to be 2.0 mg/mL.
As shown in FIG. 2, the transmission electron micrograph of the obtained gold/silver bimetallic nano-dispersion is good in dispersibility, the particle size is about 6nm, the energy spectrum scanning shows that the nano-material presents a binding energy peak of gold and silver atoms, and an X-ray photoelectron energy spectrum (FIG. 3) presents two peaks of Au4/f and Ag3/d binding energy, which both indicate that the bimetallic nano-material with good dispersibility is synthesized.
The application of the bimetallic nano-catalyst for reducing the CO release amount of cigarette smoke comprises the following steps:
the gold/silver bimetallic nano dispersion is injected into a cigarette filter tip by a micro-injector, the injection amount of each cigarette is 0.05mL, and then the cigarette is placed in a constant temperature and humidity box to be balanced for 2 days under the standard balance condition. And testing the CO release amount in the main stream smoke by using a smoking machine, and taking an average value of 20 cigarettes.
The influence of the gold/silver bimetallic nano-catalyst on CO release in cigarette smoke is evaluated by taking cigarettes of the same brand without the catalyst as a control sample, and the results are shown in the following table:
example 3
The embodiment provides a preparation method of a bimetallic nano-catalyst for reducing CO release amount of cigarette smoke, which comprises the following steps:
(1) the lysimachia christinae hance polysaccharide is dispersed in water, stirred and heated to be fully dissolved to make the concentration of the lysimachia christinae hance polysaccharide be 5mg/mL, and vacuum-filtered to remove impurity crystal nucleus.
(2) Preparing chloroauric acid and silver nitrate water solution, wherein the concentration of each solution is 1 mM.
(3) Mixing 2mL of silver nitrate solution obtained in the step (2) with the lysimachia christinae hance polysaccharide solution obtained in the step (1) under the condition of stirring, wherein the volume ratio of the silver nitrate solution to the lysimachia christinae hance polysaccharide solution is 1:9, adding 1M sodium hydroxide solution to adjust the solution to be alkaline, and then placing the mixed solution into 50 partsoC shaking the mixture in a shaker for 1 hour.
(4) Dropwise adding 6mL of chloroauric acid solution in the step (2) into the mixed solution obtained in the step (3), and continuing to add 50oC, oscillating in a shaking table for 1 hour to obtain the gold/silver alloy nano solution with stable lysimachia polysaccharide.
(5) And (3) centrifuging the alloy nano dispersion liquid obtained in the step (4) at 12000rpm for 20 minutes, removing redundant lysimachia polysaccharide and sodium hydroxide in the solution, freeze-drying the alloy nano particles obtained by centrifugation, and then re-dispersing the alloy nano particles into an ethanol solution to enable the concentration of the alloy nano particles to be 1.0 mg/mL.
The application of the bimetallic nano-catalyst for reducing the CO release amount of cigarette smoke comprises the following steps:
dispersing the gold/silver bimetallic nano-catalyst on the surface of an acetate fiber tow to prepare a filter stick containing the bimetallic nano-catalyst, balancing for 2 days, wherein the average mass of the catalyst in each filter tip is 0.05mg, and connecting the filter stick with a cigarette. And testing the CO release amount in the main stream smoke by using a smoking machine, and taking an average value of 20 cigarettes.
The influence of the gold/silver bimetallic nano-catalyst on CO release in cigarette smoke is evaluated by taking cigarettes of the same brand without the catalyst as a control sample, and the results are shown in the following table:
example 4
The embodiment provides a preparation method of a bimetallic nano-catalyst for reducing CO release amount of cigarette smoke, which comprises the following steps:
(1) the lysimachia christinae hance polysaccharide is dispersed in water, stirred and heated to be fully dissolved to make the concentration of the lysimachia christinae hance polysaccharide be 5mg/mL, and vacuum-filtered to remove impurity crystal nucleus.
(2) Preparing chloroauric acid and silver nitrate water solution, wherein the concentration of each solution is 1 mM.
(3) Mixing 3mL of silver nitrate solution obtained in the step (2) with the lysimachia christinae hance polysaccharide solution obtained in the step (1) under the condition of stirring, wherein the volume ratio of the silver nitrate solution to the lysimachia christinae hance polysaccharide solution is 1:10, adding 0.5mL of sodium hydroxide solution and 1M to adjust the solution to be alkaline, and then placing the mixed solution in a 50-volume-ratio containeroC shaking the mixture in a shaker for 1 hour.
(4) Dropwise adding 4.5mL of chloroauric acid solution in the step (2) into the mixed solution obtained in the step (3), and continuing to add 50oC, oscillating in a shaking table for 1 hour to obtain the gold/silver alloy nano solution with stable lysimachia polysaccharide.
(5) And (3) centrifuging the alloy nano dispersion liquid obtained in the step (4) at 8000rpm for 10 minutes, removing redundant desmodium polysaccharide and sodium hydroxide in the solution, freeze-drying the alloy nano particles obtained by centrifugation, and re-dispersing the alloy nano particles in an ethanol solution to enable the concentration of the alloy nano particles to be 1.0 mg/mL.
The application of the bimetallic nano-catalyst for reducing the CO release amount of cigarette smoke comprises the following steps:
dispersing the gold/silver bimetallic nano-catalyst on the surface of an acetate fiber tow to prepare a filter stick containing the bimetallic nano-catalyst, balancing for 2 days, wherein the average mass of the catalyst in each filter tip is 0.05mg, and connecting the filter stick with a cigarette. And testing the CO release amount in the main stream smoke by using a smoking machine, and taking an average value of 20 cigarettes.
The influence of the gold/silver bimetallic nano-catalyst on CO release in cigarette smoke is evaluated by taking cigarettes of the same brand without the catalyst as a control sample, and the results are shown in the following table:
example 5
The embodiment provides a preparation method of a bimetallic nano-catalyst for reducing CO release amount of cigarette smoke, which comprises the following steps:
(1) the lysimachia christinae hance polysaccharide is dispersed in water, stirred and heated to be fully dissolved to make the concentration of the lysimachia christinae hance polysaccharide be 5mg/mL, and vacuum-filtered to remove impurity crystal nucleus.
(2) Preparing chloroauric acid and silver nitrate water solution, wherein the concentration of each solution is 3 mM.
(3) Mixing 2mL of silver nitrate solution obtained in the step (2) with the lysimachia christinae hance polysaccharide solution obtained in the step (1) under stirring, wherein the volume ratio of the silver nitrate solution to the lysimachia christinae hance polysaccharide solution is 1:12, adding 1M sodium hydroxide solution to adjust the solution to be alkaline, and then placing the mixed solution into a 50-degree mixeroC shaking the mixture in a shaker for 0.5 hour.
(4) Dropwise adding 6mL of chloroauric acid solution in the step (2) into the mixed solution obtained in the step (3), and continuing to add 50oC, oscillating and reacting for 1.2 hours in a shaking table to obtain the gold/silver alloy nano solution with stable lysimachia polysaccharide.
(5) And (3) centrifuging the alloy nano dispersion liquid obtained in the step (4) at 12000rpm for 10 minutes, removing redundant lysimachia polysaccharide and sodium hydroxide in the solution, freeze-drying the alloy nano particles obtained by centrifugation, and then re-dispersing the alloy nano particles into an ethanol solution to enable the concentration of the alloy nano particles to be 1.5 mg/mL.
The application of the bimetallic nano-catalyst for reducing the CO release amount of cigarette smoke comprises the following steps:
dispersing the gold/silver bimetallic nano-catalyst on the surface of an acetate fiber tow to prepare a filter stick containing the bimetallic nano-catalyst, balancing for 2 days, wherein the average mass of the catalyst in each filter tip is 0.05mg, and connecting the filter stick with a cigarette. And testing the CO release amount in the main stream smoke by using a smoking machine, and taking an average value of 20 cigarettes.
The influence of the gold/silver bimetallic nano-catalyst on CO release in cigarette smoke is evaluated by taking cigarettes of the same brand without the catalyst as a control sample, and the results are shown in the following table:
the above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (8)
1. A preparation method of a bimetallic nano-catalyst for reducing CO release amount of cigarette smoke is characterized by comprising the following steps:
(1) dispersing the lysimachia christinae hance polysaccharide in water, heating and stirring until the lysimachia christinae hance polysaccharide is dissolved, and removing impurity crystal nucleus by vacuum filtration to obtain a lysimachia christinae hance polysaccharide solution;
(2) preparing chloroauric acid solution and silver nitrate water solution with the concentration of 1-10 mM;
(3) mixing the silver nitrate aqueous solution prepared in the step (2) with the desmodium polysaccharide solution obtained in the step (1) under the condition of stirring, adjusting the pH to 11-13 by using a sodium hydroxide solution with the concentration of 1M, and oscillating the mixture in a shaking table at 50 ℃ for 0.5-1.5 hours to obtain a mixed solution;
(4) dropwise adding the chloroauric acid solution prepared in the step (2) into the mixed solution obtained in the step (3), and continuously oscillating in a shaking table at 50 ℃ for 0.5-1.5 hours to obtain gold/silver alloy nano solution with stable lysimachia polysaccharide;
(5) and (4) centrifugally separating the gold/silver alloy nano solution obtained in the step (4) to obtain a gold/silver alloy nano catalyst, freeze-drying the gold/silver alloy nano catalyst, and re-dispersing the gold/silver alloy nano catalyst in an ethanol solution to ensure that the concentration of the gold/silver alloy nano catalyst is 1-2 mg/mL to obtain the bimetallic nano catalyst dispersion liquid.
2. The preparation method of the bimetallic nano-catalyst for reducing the CO release amount of the cigarette smoke according to claim 1, characterized by comprising the following steps: the concentration of the pennywort polysaccharide solution in the step (1) is 3-8 mg/mL.
3. The preparation method of the bimetallic nano-catalyst for reducing the CO release amount of the cigarette smoke according to claim 1, characterized by comprising the following steps: the volume ratio of the silver nitrate aqueous solution to the desmodium polysaccharide solution in the step (3) is 1 (8-12).
4. The preparation method of the bimetallic nano-catalyst for reducing the CO release amount of the cigarette smoke according to claim 1, characterized by comprising the following steps: au in the gold/silver alloy nano solution in the step (5)3+With Ag+The molar ratio is (1-9) to 3.
5. The preparation method of the bimetallic nano-catalyst for reducing the CO release amount of the cigarette smoke according to claim 1, characterized by comprising the following steps: the centrifugal separation rotating speed in the step (5) is 8000-12000 rpm, and the time is 10-20 minutes.
6. Use of the catalyst obtained by the process for the preparation of bimetallic nanocatalysts as claimed in any one of claims 1 to 5, characterized by the steps of: and in the opening and forming stage of the acetate fiber tows of the filter stick, spraying the dispersion liquid of the bimetallic nano-catalyst on the surfaces of the tows to prepare the filter stick containing the bimetallic nano-catalyst, and connecting the filter stick and the cigarette to finish the preparation of the low CO cigarette.
7. Use of the catalyst obtained by the process for the preparation of bimetallic nanocatalysts as claimed in claim 6, characterized in that: the filter tip of the cigarette contains the bimetallic nano-catalyst with the mass of 0.05-0.3 mg.
8. Use of the catalyst obtained by the process for the preparation of bimetallic nanocatalysts as claimed in any one of claims 1 to 5, characterized by the steps of: injecting the bimetallic nano catalyst dispersion liquid into the cigarette filter tip by a micro injector, wherein the injection amount of each cigarette is 0.05-0.3mL, and then placing the cigarette in a constant temperature and humidity box under the standard balance condition for balancing for 2 days.
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| CN110860134B (en) * | 2019-11-27 | 2021-09-24 | 郑州轻工业大学 | Micro-nano fiber filter disc with adsorption and catalytic harm reduction mechanisms and preparation method and application thereof |
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