CN103954576B - A kind ofly measure the method for Chemical Components in Cigarette Smoke at the adsorption form on solid adsorption material surface - Google Patents

Abstract

The present invention relates to infrared spectrum chemical analysis technology field, be specifically related to a kind ofly measure the method for Chemical Components in Cigarette Smoke at the adsorption form on solid adsorption material surface.The present invention is by being filled in In-situ Infrared reaction tank by solid adsorption material, and cigarette smoke volatilization or semi-volatility component are introduced in In-situ Infrared reaction tank by carrier gas and pipeline, use determination of infrared spectroscopy, analyze is carried out to infrared spectrum, thus cigarette smoke volatilization or the adsorption form of semi-volatility component on solid adsorption material surface can be obtained.Provided by the inventionly a kind ofly measure the method for Chemical Components in Cigarette Smoke at the adsorption form on solid adsorption material surface, judge the adsorptive power of different solid adsorption material adsorption active sites, for modification and the more valuable information of exploitation proposition of cigarette filter solid adsorption material, meet the demand of Harm reduction techniques technical development, there is very important realistic meaning.

Description

A method for determining the adsorption form of cigarette smoke components on the surface of solid adsorption materials

technical field

The invention relates to the technical field of infrared spectrochemical analysis, in particular to a method for measuring the adsorption form of cigarette smoke components on the surface of a solid adsorption material.

Background technique

With the growing controversy of smoking and health issues, the tobacco industry is facing huge challenges, reducing tar and harm has become the current development direction and trend of the tobacco industry. Among them, the application of cigarette filter adsorption materials to the adsorption of harmful smoke components, as one of the important means of reducing tar and harm, has always attracted the attention of researchers. Therefore, how to judge the adsorption characteristics of solid adsorbent materials, that is, the adsorption form of smoke components on the surface of solid adsorbent materials, has extremely important practical significance for the application of adsorbent materials on cigarette filters.

At present, in the tobacco industry, to determine the adsorption characteristics of a certain solid adsorption material, generally starting from the smoke, using the comparison method to directly measure the removal rate of some volatile components in the cigarette smoke components, so as to determine the adsorption performance of the adsorption material. Instruments such as XRD, XPS, TEM, SEM, and BET can only play an auxiliary role in analyzing and determining the properties of solid adsorption materials. The characterization of the interaction mode between cigarette smoke and solid adsorbent materials has not been reported. It can be seen that at present, the research and development of solid adsorption materials is only considered unilaterally, and the interaction between flue gas and solid adsorption materials is ignored, which has great limitations and needs to be resolved urgently.

Infrared spectroscopy is a method for structural analysis and qualitative and quantitative analysis of various compounds that absorb infrared light by using the selective absorption of electromagnetic radiation in the infrared region. When the bonded atom or chemical bond interacts with the solid adsorption material and the adsorption reaction occurs, the electron cloud around the bonded atom changes, resulting in a shift in the vibration energy level transition of the bonded atom. Infrared spectroscopy is used to measure the bonded atom in the molecule. Vibration level transitions can be used as a characteristic characterization method to determine the special functional groups of organic substances. At present, infrared spectroscopy is used to characterize the adsorption form of some irreversible adsorbed substances on the surface of solid materials, and infrared spectroscopy analysis is usually performed after conventional tablet preparation. However, it is not feasible to characterize the adsorption form of cigarette smoke components on the surface of solid adsorption materials after the volatile or semi-volatile substances in cigarette smoke components are prepared by pressing tablets.

In situ infrared spectroscopy, as an important analytical tool for studying the interaction between gas and solid materials, has been widely used in catalytic reactions to characterize the adsorption forms of gas molecules on the surface of solid adsorption materials under in situ conditions, especially in catalytic reactions. Capture some substances in the intermediate state of the reaction, and understand the mechanism of the catalytic reaction from the perspective of molecular atoms. However, the use of in-situ infrared spectroscopy to investigate the interaction mode of volatile or semi-volatile components in cigarette smoke when physical adsorption and chemical adsorption coexist on the surface of solid adsorption materials has not been reported.

Therefore, how to use in-situ infrared spectroscopy to investigate the adsorption form of volatile or semi-volatile components in cigarette smoke on the surface of solid adsorption materials, so as to explore the adsorption characteristics of solid adsorption materials and meet the needs of the development of cigarette tar and harm reduction technology, is very worthy of this paper. Field practitioner research and discussion.

Contents of the invention

In view of the shortcomings of the prior art described above, the purpose of the present invention is to provide a method for determining the adsorption form of cigarette smoke components on the surface of a solid adsorption material, using in-situ infrared spectroscopy to solve the problem that the prior art can only measure The adsorption form of the irreversible adsorption species on the surface of the solid adsorption material overcomes the deficiency in the characterization technique of the determination of the adsorption form of the reversible adsorption on the surface of the solid adsorption material, and then studies the volatile or semi-volatile components in the cigarette smoke components on the solid adsorption material. At the same time, it can qualitatively analyze the surface adsorption amount of different adsorption active sites, provide more valuable information for the modification and development of cigarette filter solid adsorption materials, and meet the needs of the development of cigarette harm reduction technology.

In order to achieve the above object, the present invention provides a method for determining the adsorption form of cigarette smoke components on the surface of a solid adsorption material, comprising the following steps:

The in-situ infrared spectrum refers to that during the test process, the in-situ fixed reduction adsorption material is in the actual adsorption environment, and the infrared spectrum is continuously scanned with infrared rays to collect data such as infrared spectra of microscopic reaction changes, and according to the collected data Techniques for quantitative and qualitative analysis.

1) Mixing the cigarette smoke components with the carrier gas, and performing an adsorption reaction between the mixed gas and the solid adsorption material;

Preferably, the solid adsorption material is selected from activated carbon, molecular sieve, white carbon black, ion exchange resin and the like. Further, the molecular sieves are selected from molecular sieves 3A, 4A, 5A, 13X, 13Z, and AA.

Preferably, the specific method for carrying out the adsorption reaction between the mixed gas and the solid adsorption material is: the solid adsorption material is filled in the in-situ infrared reaction cell, and the mixed gas is introduced into the in-situ infrared reaction cell through the pipeline, The adsorption reaction is carried out with the solid adsorption material located in the in-situ infrared reaction cell.

Further, the in-situ infrared reaction cell is installed in an infrared spectrometer.

Further, the pipeline controls sample injection through a six-way valve, and controls the gas flow rate through a mass flow meter. Specifically, as shown in Figure 1, the gas comes out of the pressure reducing valve of the steel cylinder, the gas flow rate is controlled by the mass flow meter connected to the pipeline, and the sampling is controlled by the six-way valve. The first six-way valve controls the switching between sampling and injection; while the second six-way valve connected to the in-situ infrared reaction cell controls the switching between pulse injection and continuous injection.

The in-situ infrared reaction pool refers to a device that places solid powder adsorption materials, and can control the diffuse reflection of the infrared light path on the surface of the solid adsorption materials, and can simultaneously pass reaction gases and control the reaction temperature.

The high-temperature in-situ infrared reaction cell refers to an in-situ infrared reaction cell whose reaction temperature can be controlled at room temperature or above.

The installation of the in-situ infrared reaction cell in the infrared spectrometer means that the in-situ infrared reaction cell is installed in the infrared light path of the infrared spectrometer, so that infrared light can be diffusely reflected on the surface of the solid adsorption material (filled in the in-situ infrared reaction cell) .

Preferably, the cigarette smoke components are selected from carbon monoxide, crotonaldehyde, acrolein and acetaldehyde.

Further, the concentrations of the cigarette smoke components carbon monoxide, crotonaldehyde, acrolein and acetaldehyde in the mixed gas are similar to those in the actual cigarette smoke. In order to investigate the performance of the solid adsorption material in practical use.

Preferably, the carrier gas is selected from helium, argon and nitrogen.

The carrier gas is an inert gas that does not absorb in the infrared region.

Preferably, the surface of the solid adsorption material needs to be desorbed before the adsorption reaction. Specifically, the desorption treatment is performed at a temperature higher than the adsorption temperature for a certain period of time, so that the surface of the solid adsorption material is easily decomposed and the volatile components are desorbed, so as to avoid affecting the baseline stability during the adsorption experiment.

Further, the desorption treatment conditions are: pass the carrier gas for 30 minutes, the carrier gas flow rate is 20mL/min, heat the solid adsorption material to 120°C at a rate of 10°C/min, and keep it for 30min, so that the surface of the solid adsorption material is adsorbed Species desorption, cooling to 30-90 ℃, stable for 30min.

Preferably, the reaction conditions of the adsorption reaction are: adsorption reaction test temperature: 10-100°C; volume percentage ratio of cigarette smoke components to carrier gas in the mixed gas is 0.01-2%: 98-99.99% ; The flow rate of the mixed gas is 20mL/min; Reaction time: 30min. Preferably, the adsorption reaction test temperature: 30-90°C.

The principle of the adsorption reaction between the cigarette smoke components and the solid adsorption material is as follows: the adsorption of the solid adsorption material is mainly divided into dispersion adsorption and polar adsorption. Dispersive adsorption is that the solid adsorption material and the adsorbed gas are close to each other, and the dipole moment changes, and the resulting adsorption behavior is mostly physical adsorption; polar adsorption is that the solid adsorption material and the adsorbed gas are due to the polar interaction, and the electron cloud The adsorption behavior that occurs due to the transfer is mostly chemical adsorption. When polar adsorption occurs, the adsorbed gas is enriched on the solid adsorption surface, and the electron pairs of the functional groups are transferred at the same time. It is easy to use infrared spectroscopy to determine the adsorption form of the interaction between the functional group and the solid adsorption material.

2) Using an infrared spectrometer to measure the surface of the solid adsorption material to obtain an infrared spectrum;

Preferably, the infrared spectrometer is a Fourier transform infrared spectrometer.

The said infrared spectrometer measures the surface of the solid adsorption material and obtains the infrared spectrum refers to: adopting the infrared spectrometer to continuously measure and collect the infrared spectrum of the species on the surface of the solid adsorption material in situ.

Preferably, when the mixed gas is undergoing adsorption reaction with the solid adsorption material, an infrared spectrometer is used simultaneously to measure the surface of the solid adsorption material.

Further, the infrared spectrometer is used simultaneously to measure the surface of the solid adsorption material, and when the adsorption reaction between the mixed gas and the solid adsorption material reaches saturated adsorption, the spectrum collection is stopped.

Specifically, the saturated adsorption refers to: when the mixed gas and the solid adsorption material undergo an adsorption reaction, simultaneously use an infrared spectrometer to measure the surface of the solid adsorption material, and continuously collect spectra. When the peak intensity in the infrared spectrum obtained by the measurement does not change with time, that is, the gas molecules have reached a saturated adsorption state on the surface of the solid adsorption material.

Preferably, the measurement conditions of the infrared spectrometer are: spectral range: 4000-650cm ^-1 ; highest resolution: 0.4cm ^-1 ; signal-to-noise ratio: 20000:1 (PP); beam splitter: KBr; detector: MCT; light source: long-life cold infrared; sensitivity: 10ppm; continuous sampling interval: 6-60s; number of spectra: 73; detection time: 30min;

3) Analyze the infrared spectrogram obtained in step 2) to determine the content of cigarette smoke components on the surface of the solid adsorbent material.

surface adsorption.

The principle of analyzing the obtained infrared spectrum is: when the adsorbed gas is adsorbed on the surface of the solid adsorbent, its functional groups are enriched on the surface of the solid adsorbent, and at the same time the electron pairs of the adsorbed functional groups are transferred. The change of the infrared adsorption wave number of some functional groups can determine which functions have interacted with the solid adsorption material and form adsorption, and according to the shift of the infrared absorption wave number, the adsorption form of the interaction between the functional group and the solid adsorption material can be determined.

The adsorption form of cigarette smoke components on the surface of the solid adsorption material means that the functional groups have a certain spatial structure, and after they interact with the surface atoms of the solid adsorption material, the adsorption structure is very different. On the surface of the same solid adsorption material, the adsorbed gas molecules can interact with one atom on the surface of the solid adsorption material, and can also interact with multiple atoms. The above different adsorption forms have great differences in the strength of the adsorption force. On the surface of different solid adsorption materials, the adsorbed gas molecules interact with the surface atoms of a single solid adsorption material, and the transfer forms of electron pairs are also different. For the above adsorption behavior, using infrared means to observe the absorption of functional groups in the infrared band, the specific adsorption form of the adsorbed molecules on the surface of the solid adsorption material can be determined. In order to use some cheap adsorption materials, the surface is modified with functional groups with specific adsorption capacity, so as to achieve the same adsorption capacity as the more expensive solid adsorption materials.

The infrared spectrograms of the flue gas components can be found from databases (commonly used infrared databases include NISTChemistryWebBook, the NIMC organic spectrum library of SDBS and the ChemExper chemical catalog CDD, etc.), and the adsorption capacity of different active sites of solid adsorption materials for a single functional group can be It can be judged directly from the strength of the infrared absorption peak.

As mentioned above, a method for determining the adsorption form of cigarette smoke components on the surface of a solid adsorption material according to the present invention uses the measurement method of in-situ infrared spectroscopy to directly read the volatilization or semi-volatility of cigarette smoke through Fourier transform infrared spectroscopy. The real-time infrared spectrum of the volatile components after adsorption on the surface of the solid adsorption material, and the analysis and interpretation of the infrared spectrum, to investigate the physical adsorption, chemical adsorption, reversible adsorption and The interaction mode when irreversible adsorption coexists, and at the same time, it can qualitatively analyze the surface adsorption amount of different adsorption active sites. Compared with the existing technology, which can only measure the adsorption form of irreversible adsorption species on the surface of solid adsorption materials, it overcomes the shortcomings in the characterization technology of the determination of reversible adsorption on the surface of solid adsorption materials, and can be extended to the study of volatilization or The adsorption form of semi-volatile components on solid adsorption materials provides more valuable information for the modification and development of cigarette filter solid adsorption materials, and meets the needs of the development of cigarette harm reduction technology.

Description of drawings

Figure 1 shows a schematic diagram of the connection of the overall device for in-situ infrared spectroscopy of the present invention, wherein, 1: in-situ infrared reaction cell; 2: infrared spectrometer; 3: six-way valve; 4: mass flow meter

Figure 2 shows the infrared spectra of CO saturated adsorption of the 3A molecular sieve of the present invention at 30°C, 60°C and 90°C

Figure 3 shows the infrared spectra of CO saturation adsorption for 3A, 4A, 5A, 13X, 13Z and AA molecular sieves of the present invention at 30°C

Figure 4 shows the infrared spectrum of saturated adsorption of crotonaldehyde, acrolein and acetaldehyde under the condition of 30°C for 13X molecular sieve of the present invention

detailed description

The present invention will be further described below in conjunction with specific examples. It should be understood that these examples are only used to illustrate the present invention and are not intended to limit the protection scope of the present invention.

Materials selected in this embodiment include instruments, samples and reagents as follows:

1 material

1.1 Instrument

DRK-4-NI8 high temperature in-situ infrared reaction cell (HARRICK company, USA); Nicolet5700 Fourier transform infrared spectrometer (Thermofisher company, USA); C100L mass flow meter (SIERRA company, USA); PMF-1 six-way valve (Nanjing Kelihua Instrumentation Co., Ltd.)

1.2 Samples and reagents

Cigarette smoke components: carbon monoxide, crotonaldehyde, acrolein, acetaldehyde (99.999%, Shanghai Jiliang Standard Gas Co., Ltd.); carrier gas: helium, argon, nitrogen (99.9999%, Shanghai Jiliang Standard Gas Co., Ltd.) ; Solid adsorption material: activated carbon (Jacobi carbon company), white carbon black (Evonik Industrial Group), ion exchange resin (Dow, USA), molecular sieve: 3A, 4A, 5A, 13X, 13Z, AA (Shanghai Lvqiangxin Materials Co., Ltd.)

Example 1

1. Method

1.1 Pre-processing

Fill the solid adsorption material 3A molecular sieve into the in-situ infrared reaction cell, and install the in-situ infrared reaction cell in the infrared spectrometer. Introduce nitrogen gas with a purity of 99.9999% for half an hour (flow rate 20mL/min) to carry out the desorption procedure, heat the in-situ reaction cell to 120°C at a rate of 10°C/min, and keep it for half an hour, so that the species adsorbed on the surface of the molecular sieve After desorption, the temperature was lowered to 30, 60, and 90°C respectively, and it was stable for half an hour. The cigarette smoke component CO is mixed with the carrier gas N ₂ , introduced into the in-situ infrared reaction cell through the pipeline, and undergoes adsorption reaction with the solid adsorption material.

1.2 Determination

For the mixed gas introduced into the in-situ infrared reaction cell for adsorption reaction with the solid adsorption material, the infrared spectrometer is used to measure the surface of the solid adsorption material simultaneously, and the spectrum is continuously collected, and the spectrum collection is stopped after the adsorption reaction reaches saturation.

The reaction conditions of the in-situ infrared reaction cell are: the volume percentage ratio of mixed gas CO to N2: ₂ %:98%; mixed gas flow rate: 20mL/min; adsorption reaction test temperature: 30, 60, 90°C; Reaction time: 30min.

The measurement conditions of the infrared spectrometer are: spectral range: 4000-650cm ^-1 ; highest resolution: 0.4cm ^-1 ; signal-to-noise ratio: 20000:1 (PP); beam splitter: KBr; detector: MCT; light source: long life Cold infrared; sensitivity: 10ppm; continuous sampling interval: 60s; number of spectra: 73; detection time: 30min; scanning speed: 24s to scan a spectrum.

2 Analysis Results and Discussion

The infrared spectrum obtained by the determination is analyzed, and the specific spectrum is shown in Figure 2. According to Figure 2, at the adsorption temperatures of 30°C and 90°C, 3A molecular sieves have better adsorption of CO. At 30°C and 60°C, the main absorption peak is at 2013cm ^-1 , which is attributed to the interaction between CO and a single Al atom. At 90°C, the main absorption peaks are at 1920cm ^-1 and 1865cm ^-1 , which are attributed to the interaction between CO and two Al atoms, and the interaction between CO and three Al atoms, respectively. The concentration of CO here is 2%, the measured data has high sensitivity, and the signal-to-noise ratio S/N is =2500-8100.

It can be seen that for CO, the component of cigarette smoke, under different temperature conditions, the adsorption capacity of the adsorption material 3A molecular sieve is different. Therefore, choosing an adsorption temperature close to room temperature of 25-30°C or a high temperature of 90°C can effectively adsorb CO molecules. At different temperatures, the adsorption forms of CO are also different. At present, the adsorption performance of conventional adsorption materials decreases with the increase of temperature, and here we found that the adsorption material 3A molecular sieve can have better adsorption performance on cigarette smoke component CO at different temperatures, which is conducive to the development of new It is an adsorbent material with good adsorption performance at different temperatures.

Example 2

1. Method

1.1 Pre-processing

Fill solid adsorption materials 4A, 5A, 13X, 13Z, and AA molecular sieves into the in-situ infrared reaction cell, and install the in-situ infrared reaction cell in the infrared spectrometer. Introduce helium gas with a purity of 99.9999% for half an hour (flow rate 20mL/min) to carry out the desorption procedure, heat the in-situ reaction cell to 120°C at a rate of 10°C/min, and keep it for half an hour to allow the surface of the molecular sieve to adsorb Species were desorbed, and the temperature was lowered to 30°C and stabilized for half an hour. The cigarette smoke component CO is mixed with the carrier gas He, and introduced into the in-situ infrared reaction cell through the pipeline, and undergoes adsorption reaction with the solid adsorption material.

1.2 Determination

For the mixed gas introduced into the in-situ infrared reaction cell for adsorption reaction with the solid adsorption material, the infrared spectrometer is used to measure the surface of the solid adsorption material simultaneously, and the spectrum is continuously collected, and the spectrum collection is stopped after the adsorption reaction reaches saturation.

The reaction conditions of the in-situ infrared reaction cell are: the volume percentage ratio of CO and He in the mixed gas: 2%:98%; the flow rate of the mixed gas: 20mL/min; the adsorption reaction test temperature: 30°C; the reaction time: 30min.

The measurement conditions of the infrared spectrometer are: spectral range: 4000-650cm ^-1 ; highest resolution: 0.4cm ^-1 ; signal-to-noise ratio: 20000:1 (PP); beam splitter: KBr; detector: MCT; light source: long life Cold infrared; sensitivity: 10ppm; continuous sampling interval: 6s; number of spectra: 73; detection time: 30min; scanning speed: 24s to scan a spectrum.

2 Analysis Results and Discussion

The infrared spectrum obtained by the determination was analyzed, and the specific spectrum is shown in Figure 3. According to Figure 3, it can be seen that the adsorption capacity of 13X and 13Z molecular sieves is relatively strong. The pore size of 13X and 13Z molecular sieves is 1nm, which is suitable for the diffusion of CO molecules into the pores, and is conducive to the interaction between the inner surface of the pores and CO molecules. At the same time, the silicon aluminum of 13X and 13Z molecular sieves is higher than other molecular sieves, and there are more hydroxyl groups and water on the surface. In this way, more CO molecules can be adsorbed due to the hydrogen bond. Based on the above two points, 13X and 13Z molecular sieves have shown superior CO adsorption capacity. In Figure 3, the infrared absorption peaks at 2046cm ^-1 and 2021cm ^-1 can be attributed to CO adsorbed by OH groups, and the infrared absorption peaks at 2046cm ^-1 and 2021cm ^-1 can be attributed to CO adsorbed by OH groups, and 1994cm ^- 1 The infrared absorption peaks at ¹ and 1970 cm ^-1 can be assigned to the CO adsorbed by metal ions in the molecular sieve. The concentration of CO here is 2%, the measured data has high sensitivity, and the signal-to-noise ratio S/N=270-45000.

It can be seen that for the CO component of cigarette smoke, different adsorbent materials are selected under the same temperature of 30°C, and the best adsorbent material is selected to replace the existing conventional adsorbent material. Taking this as a lesson, modifying polar groups such as hydroxyl groups and carbonyl groups on the surface of conventional adsorption materials can more effectively improve its ability to adsorb CO, and at the same time increase the use value of conventional adsorption materials.

Example 3

1. Method

1.1 Pre-processing

Fill the solid adsorption material 13X molecular sieve into the in-situ infrared reaction cell, and install the in-situ infrared reaction cell in the infrared spectrometer. Introduce argon gas with a purity of 99.9999% for half an hour (flow rate 20mL/min) to carry out the desorption procedure, heat the in-situ reaction cell to 120°C at a rate of 10°C/min, and keep it for half an hour to allow the surface of the molecular sieve to adsorb Species desorption, cooling to 30 ° C, stable for half an hour. The cigarette smoke components crotonaldehyde, acrolein and acetaldehyde were mixed with the carrier gas Ar, and introduced into the in-situ infrared reaction pool through the pipeline, and carried out adsorption reaction with the solid adsorption material.

1.2 Determination

For the mixed gas that undergoes adsorption reaction with the solid adsorption material, the infrared spectrometer is used simultaneously to measure the surface of the solid adsorption material, and the spectrum is continuously collected, and the spectrum collection is stopped after the adsorption reaction reaches saturation.

The reaction conditions of the in-situ infrared reaction cell are: the volume percentage ratio of the mixed gas crotonaldehyde to Ar: 0.01%: 99.99%; the volume percentage ratio of the mixed gas acrolein to _N2 : 0.01%: 99.99% ; Volume percentage ratio of acetaldehyde to N ₂ in mixed gas: 0.01%: 99.99%; Flow rate of mixed gas: 20mL/min; Adsorption reaction test temperature: 30°C; Reaction time: 30min.

The measurement conditions of the infrared spectrometer are: spectral range: 4000-650cm ^-1 ; highest resolution: 0.4cm ^-1 ; signal-to-noise ratio: 20000:1 (PP); beam splitter: KBr; detector: MCT; light source: long life Cold infrared; sensitivity: 10ppm; continuous sampling interval: 6-60s; number of spectra: 73; detection time: 30min; scanning speed: 24s to scan a spectrum.

2 Analysis Results and Discussion

The infrared spectrum obtained by the determination is analyzed, and the specific spectrum is shown in Figure 4. According to Figure 4, the position of the specific infrared absorption peak is marked in the figure, and the adsorption of acrolein on the surface of 13X molecular sieve is stronger than that of crotonaldehyde and acetaldehyde. Finally, a negative peak appeared at 1654cm ^-1 , which was attributed to the infrared absorption of water and hydroxyl. Therefore, the information that can be obtained is that the adsorption form of crotonaldehyde, acrolein and acetaldehyde on the surface of 13X molecular sieve is that the oxygen atoms on the aldehyde group interact with the water and hydroxyl groups on the surface of the molecular sieve. The measured data has high sensitivity, and the signal-to-noise ratio S/N=400-1270.

It can be seen that, for different gas components in cigarette smoke, at the same temperature of 30°C, the selection of suitable adsorption materials can replace the existing conventional adsorption materials. Moreover, modifying polar functional groups such as hydroxyl group and carbonyl group on the surface of other relatively cheap conventional solid adsorption materials can achieve the same adsorption capacity as the more expensive solid adsorption materials and improve its use value.

In summary, a method for measuring the adsorption form of cigarette smoke components on the surface of solid adsorbent materials according to the present invention is used to study the adsorption forms of volatile or semi-volatile components in cigarette smoke components on solid adsorbent materials, and can also qualitatively Analyze the surface adsorption capacity of different adsorption active sites, and according to the obtained experimental results, determine the adsorption capacity of different solid adsorption materials surface adsorption active sites, so as to use some cheap adsorption materials to modify the surface with functional groups with specific adsorption capacity , to achieve the same adsorption capacity as the more expensive solid adsorption materials. Provide more valuable information for the modification and development of cigarette filter solid adsorption materials, and meet the needs of the development of cigarette harm reduction technology. Therefore, the present invention effectively overcomes various shortcomings in the prior art and has high industrial application value.

The above-mentioned embodiments only illustrate the principles and effects of the present invention, but are not intended to limit the present invention. Anyone skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or changes made by those skilled in the art without departing from the spirit and technical ideas disclosed in the present invention should still be covered by the claims of the present invention.

Claims (7)

1. A method for measuring the adsorption form of cigarette smoke components on the surface of a solid adsorbent material, comprising the following steps: 1) Mixing the cigarette smoke components with the carrier gas, and performing an adsorption reaction between the mixed gas and the solid adsorption material; Before the adsorption reaction, it is necessary to desorb the surface of the solid adsorption material; the desorption treatment conditions are: pass the carrier gas for 30 minutes, the carrier gas flow rate is 20mL/min, and the solid adsorption material is heated to 120°C at a rate of 10°C/min. ℃, and keep it for 30 minutes to desorb the adsorbed species on the surface of the solid adsorption material, cool down to 30-90 ℃, and stabilize for 30 minutes; The reaction conditions of the adsorption reaction are as follows: the adsorption reaction test temperature: 10-100°C; the volume percentage ratio of the cigarette smoke component in the mixed gas to the carrier gas is 0.01-2%: 98-99.99%; The flow rate is 20mL/min; the reaction time: 30min; 2) Using an infrared spectrometer to measure the surface of the solid adsorption material to obtain an infrared spectrum; 3) Analyzing the infrared spectrum obtained from the measurement in step 2), so as to determine the adsorption form of the cigarette smoke components on the surface of the solid adsorption material. 2. A method for determining the adsorption form of cigarette smoke components on the surface of a solid adsorbent according to claim 1, wherein the specific method for carrying out the adsorption reaction between the mixed gas and the solid adsorbent is: the solid The adsorption material is filled in the in-situ infrared reaction cell, and the mixed gas is introduced into the in-situ infrared reaction cell through the pipeline, and undergoes adsorption reaction with the solid adsorption material in the in-situ infrared reaction cell. 3. A method for determining the adsorption form of cigarette smoke components on the surface of the solid adsorption material according to claim 2, characterized in that the pipeline is controlled by a six-way valve for sampling, and the mass flow meter is used to Control the gas flow rate. 4. A method for determining the adsorption form of cigarette smoke components on the surface of a solid adsorption material according to claim 1, wherein the carrier gas is selected from helium, argon, and nitrogen. 5. A method for determining the adsorption form of cigarette smoke components on the surface of the solid adsorbent material according to claim 1, characterized in that, when the mixed gas and the solid adsorbent material carry out the adsorption reaction, an infrared spectrometer is used simultaneously to measure the solid state. adsorption material surface. 6. A method for determining the adsorption form of cigarette smoke components on the surface of the solid adsorption material according to claim 5, characterized in that, the infrared spectrometer is used simultaneously to measure the surface of the solid adsorption material, when the mixed gas and solid After the adsorption material undergoes adsorption reaction and reaches saturated adsorption, the spectrum collection is stopped. 7. A method for determining the adsorption form of cigarette smoke components on the surface of a solid adsorption material according to any one of claims 1-6, characterized in that the measurement conditions of the infrared spectrometer are: spectral range ^: 4000-650cm- ¹ ; Highest resolution: 0.4cm ^-1 ; Signal-to-noise ratio: 20000:1P-P; Beam splitter: KBr; Detector: MCT; Light source: long-life cold infrared; Sensitivity: 10ppm; Continuous sampling interval: 6-60s ; Number of spectra collected: 73; Detection time: 30min; Scanning speed: 24s to scan a spectrum.