Preparation method of zinc-cerium aerogel sensing material for detecting acetone gas

Abstract

The invention discloses a preparation method of a zinc-cerium aerogel sensing material for detecting acetone gas, and relates to the field of aerogel sensing materials. The preparation method of the zinc-cerium aerogel sensing material for detecting acetone gas comprises the following steps: mixing anhydrous zinc chloride and anhydrous cerium chloride according to a molar ratio of 1: 2 in a solution of absolute ethyl alcohol and ultrapure water according to a ratio of 3: 1, adding citric acid according to a molar ratio of more than or equal to 1: 10 to the anhydrous zinc chloride, then adding ethylene oxide according to a molar ratio of more than or equal to 1: 2 to the anhydrous zinc chloride, and uniformly stirring to obtain the zinc-cerium aerogel sensing material for detecting acetone gas. The zinc-cerium aerogel sensing material capable of detecting the acetone is prepared by adding the zinc-cerium aerogel into a tubular furnace, drying the zinc-cerium aerogel in a 5L carbon dioxide supercritical drying device, and finally preparing the zinc-cerium aerogel sensing material capable of detecting the acetone through the tubular furnace in an air atmosphere under the conditions that the heating rate is 1-2 DEG C / min, the calcining temperature is 500 DEG C and the calcining time is 4 hours, and the prepared sensing material has the advantages of high response to the acetone, low detection limit and the like. The characteristics of high specific surface area and high porosity of the aerogel material are fully exerted.

Description

Technical Field

[0001] The invention relates to the technical field of aerogel sensing materials, and in particular to a method for preparing a zinc-cerium aerogel sensing material for detecting acetone gas. Background Art

[0002] Aerogel sensing materials are functional materials constructed with aerogel as the matrix. Through their unique nanoporous structure and controllable chemical composition, they can achieve highly sensitive detection and signal conversion of external stimuli such as pressure, temperature, and chemical substances.

[0003] At present, most aerogel sensing materials are prepared by traditional hydrothermal method and electrospinning method to achieve the high specific surface area, high porosity and low density characteristics required by aerogel materials in microstructure.

[0004] Acetone is a harmful gas, and detecting its concentration changes is of great significance. Acetone detection requires measuring the resistance change of metal oxide composite materials in trace reducing or oxidizing gases to achieve detection results. Currently, there are only a handful of metal oxide composite materials fabricated into aerogel-like sensing materials, and there are requirements for the detection limit of acetone concentration to ensure safety. This application proposes a method for preparing a zinc-cerium aerogel sensing material for detecting acetone gas. By preparing an aerogel structure with a high specific surface area, it can provide more gas adsorption sites, enhance the interaction between gas molecules and the material surface, improve the response signal, and accelerate the gas diffusion and desorption process, achieving rapid response and recovery. Summary of the Invention

[0005] To address the shortcomings of the existing technology, the present invention provides a method for preparing a zinc-cerium aerogel sensing material for detecting acetone gas. This method solves the problem of achieving detection effect through the resistance change of the metal oxide composite material in trace reducing or oxidizing gases when performing acetone detection. Currently, there are only a handful of sensing materials made of metal oxide composite materials in aerogel form, and there are requirements for the detection limit of acetone concentration to ensure safety.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions: A method for preparing a zinc-cerium aerogel sensing material for detecting acetone gas, comprising the following steps:

[0007] Step S101: Anhydrous ethanol and ultrapure water are mixed uniformly, and then anhydrous zinc chloride is added to the mixture and stirred to completely dissolve, and then anhydrous cerium chloride is added thereto and stirred to obtain solution A;

[0008] Step S102: Weigh citric acid and add it to solution A. After the citric acid is added, solution B is obtained, and the solution is stirred to form a stable coordination compound solution;

[0009] Step S103: Weighing ethylene oxide and adding it to the coordination compound solution, stirring the coordination compound solution to obtain a precursor solution with stable performance;

[0010] Step S104: Pour the precursor solution into an inverted syringe, place the syringe in a constant temperature environment and let it stand until the gel is completely formed, push the colloid in the syringe into a beaker, add anhydrous ethanol to the beaker to completely immerse the colloid, and replace the anhydrous ethanol at regular intervals;

[0011] Step S105: transferring the replaced wet gel to a dedicated carbon dioxide supercritical drying device, starting the device, and gradually replacing and removing the solvent in the wet gel;

[0012] Step S106: placing the dried aerogel in a crucible, moving the crucible into a tubular furnace, and calcining according to a set temperature increase program to obtain a zinc-cerium aerogel sensing material.

[0013] Preferably, based on step S101, anhydrous ethanol and ultrapure water are mixed uniformly according to a proportion, and then a certain amount of anhydrous zinc chloride is accurately weighed and added to the mixture, and the mixture is stirred thoroughly to completely dissolve. Then, a certain amount of anhydrous cerium chloride is accurately weighed and added thereto, and the mixture is stirred continuously until a clear solution A is obtained.

[0014] Preferably, based on step S102, a specific mass of citric acid is weighed and slowly added to solution A. Stirring is performed during the addition of the citric acid to prevent local over-concentration or agglomeration. After the addition of the citric acid is completed, solution B is obtained.

[0015] Then, solution B is placed on a blender and stirred at a certain speed for a certain time until the citric acid and the metal ions in the solution fully react to form a stable coordination compound solution;

[0016] Preferably, based on step S103, a certain amount of ethylene oxide is weighed, and solution B is placed in a magnetic stirrer and stirred by the magnetic stirrer. At this time, ethylene oxide is slowly added to the stable coordination compound while stirring. After the addition is completed, stirring is continued for a certain period of time to promote the cross-linking reaction between ethylene oxide and the active groups in the solution;

[0017] During the stirring process, pay close attention to the viscosity change and reaction of the solution, and continue stirring until the solution viscosity is moderate and uniform to obtain a precursor solution with stable performance;

[0018] Preferably, based on step S104, the precursor solution is slowly loaded into an inverted syringe, and the syringe filled with the solution is placed in a constant temperature environment and left to stand to wait for gelation;

[0019] After the gel is fully formed, push the colloid in the syringe into a clean beaker. Then, slowly pour anhydrous ethanol along the wall of the beaker until the anhydrous ethanol covers the colloid, ensuring that the colloid is completely immersed.

[0020] At this time, seal the beaker mouth with plastic wrap to prevent ethanol from volatilizing and external impurities from entering;

[0021] Replace the anhydrous ethanol at regular intervals and repeat this step 4-5 times to fully replace the residual water and organic matter in the gel to ensure the purity of the gel and the subsequent treatment effect;

[0022] Preferably, based on step S105, the wet gel after the solvent replacement treatment is carefully transferred to a dedicated carbon dioxide supercritical drying device, and the device is started according to the device operating specifications, and the solvent in the wet gel is gradually replaced and removed by the supercritical carbon dioxide fluid, thereby achieving gentle and uniform drying of the wet gel to obtain a dry aerogel with high porosity and low shrinkage;

[0023] Preferably, based on step S106, the dried aerogel is gently placed in a clean crucible to ensure that the aerogel is not contaminated or damaged;

[0024] Then, the crucible was carefully moved into a tubular furnace and calcined for a certain period of time according to the set heating program, and then naturally cooled to room temperature. After the furnace temperature dropped to room temperature and the aerogel was completely cooled, the crucible was removed to obtain the zinc-cerium aerogel sensing material;

[0025] The present invention discloses a method for preparing a zinc-cerium aerogel sensing material for detecting acetone gas, which has the following beneficial effects:

[0026] The preparation method of the zinc-cerium aerogel sensing material for detecting acetone gas comprises steps S101 to S106 to prepare the zinc-cerium aerogel sensing material. By preparing an aerogel structure with a high specific surface area, more gas adsorption sites can be provided, and the response energy can disappear after the acetone disappears, and can respond again when the acetone reappears. The high specific surface area and high porosity characteristics of the aerogel material are fully utilized, the interaction between gas molecules and the material surface is enhanced, the response signal is improved, and the gas diffusion and desorption process is accelerated to achieve rapid response and recovery. The material has a response value with very small fluctuation for 10 ppm acetone under 5 cycles, and the material has good repeatability. The prepared sensing material has the advantages of high response to acetone, low detection limit, and the like, and fully utilizes the high specific surface area and high porosity characteristics of the aerogel material. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0028] Figure 1 This is a flow chart of a method for preparing a zinc-cerium aerogel sensing material for detecting acetone gas according to an embodiment of the present invention;

[0029] Figure 2 This is a photo of the zinc-cerium aerogel sensing material for detecting acetone gas after CO2 supercritical drying in accordance with an embodiment of the present invention;

[0030] Figure 3 This is a morphology diagram of the zinc-cerium aerogel sensing material for detecting acetone gas according to an embodiment of the present invention;

[0031] Figure 4 This is a test sensing performance diagram of the zinc-cerium aerogel sensing material for detecting acetone gas according to an embodiment of the present invention;

[0032] Figure 5 This is a test stability diagram of the zinc-cerium aerogel sensing material for detecting acetone gas according to an embodiment of the present invention. DETAILED DESCRIPTION

[0033] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention are clearly and completely described. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0034] The present embodiment provides a method for preparing a zinc-cerium aerogel sensing material for detecting acetone gas, solving the problem of achieving detection results by measuring the resistance change of a metal oxide composite material in the presence of trace reducing or oxidizing gases during acetone detection. Currently, there are only a handful of sensing materials made of metal oxide composite materials in aerogel form, and there are requirements for the detection limit of acetone concentration to ensure safety. The zinc-cerium aerogel sensing material is prepared through steps S101-S106. By preparing an aerogel structure with a high specific surface area, more gas adsorption sites can be provided. The response energy disappears after the acetone disappears, and it can respond again when the acetone reappears. This fully utilizes the high specific surface area and high porosity of the aerogel material, enhances the interaction between gas molecules and the material surface, improves the response signal, and accelerates the gas diffusion and desorption process, achieving rapid response and recovery. The response value for 10 ppm acetone under five cycles has a very small fluctuation, and the material has excellent repeatability. The prepared sensing material has advantages such as high response to acetone and low detection limit, fully utilizing the high specific surface area and high porosity of the aerogel material.

[0035] In order to better understand the above technical solution, the above technical solution will be described in detail below with reference to the accompanying drawings and specific implementation methods.

[0036] The embodiment of the present invention discloses a method for preparing a zinc-cerium aerogel sensing material for detecting acetone gas.

[0037] According to the attached Figure 1 As shown, the following steps are included:

[0038] Step S101: Anhydrous ethanol and ultrapure water are mixed uniformly, and then anhydrous zinc chloride is added to the mixture and stirred to completely dissolve, and then anhydrous cerium chloride is added thereto and stirred to obtain solution A;

[0039] Step S102: Weigh citric acid and add it to solution A. After the citric acid is added, solution B is obtained, and the solution is stirred to form a stable coordination compound solution;

[0040] Step S103: Weighing ethylene oxide and adding it to the coordination compound solution, stirring the coordination compound solution to obtain a precursor solution with stable performance;

[0041] Step S104: Pour the precursor solution into an inverted syringe, place the syringe in a constant temperature environment and let it stand until the gel is completely formed, push the colloid in the syringe into a beaker, add anhydrous ethanol to the beaker to completely immerse the colloid, and replace the anhydrous ethanol at regular intervals;

[0042] Step S105: transferring the replaced wet gel to a dedicated carbon dioxide supercritical drying device, starting the device, and gradually replacing and removing the solvent in the wet gel;

[0043] Step S106: placing the dried aerogel in a crucible, moving the crucible into a tubular furnace, and calcining according to a set temperature increase program to obtain a zinc-cerium aerogel sensing material.

[0044] Based on step S101, anhydrous ethanol and ultrapure water are mixed uniformly according to a certain ratio. Subsequently, a certain amount of anhydrous zinc chloride is accurately weighed and added to the mixture, and the mixture is stirred thoroughly to completely dissolve. Subsequently, a certain amount of anhydrous cerium chloride is accurately weighed and added to the mixture, and the mixture is stirred continuously until a clear solution A is obtained.

[0045] Particularly disclosed is that the ratio of the anhydrous ethanol to the ultrapure water is 3:1, and the molar ratio of the anhydrous zinc chloride to the anhydrous cerium chloride is greater than or equal to 1:2.

[0046] Specifically, 15 ml of the anhydrous ethanol and 5 ml of the ultrapure water were mixed uniformly, and then 0.88 g of the anhydrous zinc chloride was weighed and added to the mixed solution, and stirred thoroughly to completely dissolve it. Then, 3.16 g of the anhydrous cerium chloride was weighed and added thereto to obtain a first solution. The mixed solution was placed on a stirrer and stirred at 26° C. and 400 rpm for 20 minutes to obtain solution A.

[0047] Based on step S102, a specific mass of citric acid is weighed and slowly added to solution A. Stirring is performed during the addition of the citric acid to prevent local overconcentration or agglomeration. After the addition of the citric acid is completed, solution B is obtained.

[0048] Then, solution B is placed on a blender and stirred at a certain speed for a certain time until the citric acid and the metal ions in the solution fully react to form a stable coordination compound solution;

[0049] Particularly disclosed is that the molar ratio of the citric acid to the anhydrous zinc chloride is less than or equal to 1:10.

[0050] Specifically, 4 g of the citric acid was weighed and slowly added to solution A. During the addition, the solution was stirred to obtain solution B. Solution B was placed on a magnetic stirrer and stirred at 26° C. and 400 rpm for 30 minutes to form a stable coordination compound solution.

[0051] Based on step S103, a certain amount of ethylene oxide is weighed, and solution B is placed in a magnetic stirrer and stirred by the magnetic stirrer. At this time, the ethylene oxide is slowly added to the stable coordination compound while stirring. After the addition is completed, stirring is continued for a certain period of time to promote the cross-linking reaction between the ethylene oxide and the active groups in the solution;

[0052] Particularly disclosed is that the molar ratio of the ethylene oxide to the anhydrous zinc chloride is greater than or equal to 1:2.

[0053] During the stirring process, pay close attention to the viscosity change and reaction of the solution, and continue stirring until the solution viscosity is moderate and uniform to obtain a precursor solution with stable performance;

[0054] Specifically, 1.2 ml of ethylene oxide was weighed, and solution B was placed on a magnetic stirrer. 1.2 ml of the ethylene oxide was added while stirring. After the ethylene oxide was added, the mixture was stirred at 26° C. and 400 rpm for 2 minutes to obtain a precursor solution.

[0055] Based on step S104, the precursor solution is slowly loaded into an inverted syringe, and the syringe filled with the solution is placed in a constant temperature environment and allowed to stand to wait for gelation;

[0056] After the gel is fully formed, push the colloid in the syringe into a clean beaker. Then, slowly pour anhydrous ethanol along the wall of the beaker until the anhydrous ethanol covers the colloid, ensuring that the colloid is completely immersed.

[0057] At this time, seal the beaker mouth with plastic wrap to prevent ethanol from volatilizing and external impurities from entering;

[0058] Replace the anhydrous ethanol at regular intervals and repeat this step 4-5 times to fully replace the residual water and organic matter in the gel to ensure the purity of the gel and the subsequent treatment effect;

[0059] Specifically, the precursor solution is loaded into an inverted syringe, and the syringe filled with the solution is placed in a constant temperature environment and left to stand for 12 hours to wait for gelation. After the gel is completely formed, the colloid in the syringe is pushed into a clean beaker, and then anhydrous ethanol is slowly poured along the wall of the beaker until the anhydrous ethanol covers the colloid, ensuring that the colloid is completely immersed. The beaker mouth is sealed with plastic wrap, and the anhydrous ethanol in the beaker is replaced every 12 hours. Repeat this step 4 to 5 times to fully replace the residual water and organic matter in the gel.

[0060] Based on step S105, the wet gel after the solvent replacement treatment is carefully transferred to a dedicated carbon dioxide supercritical drying device. According to the equipment operating specifications, the equipment is started, and the solvent in the wet gel is gradually replaced and removed by the supercritical carbon dioxide fluid, thereby achieving gentle and uniform drying of the wet gel to obtain a dry aerogel with high porosity and low shrinkage;

[0061] Specifically, the 5L carbon dioxide supercritical drying device is used to carefully transfer the wet gel after the solvent replacement treatment to a dedicated carbon dioxide supercritical drying device. According to the equipment operating specifications, the carbon dioxide supercritical drying device is set to 12MPa, and the equipment is started. The solvent in the wet gel is gradually replaced by supercritical carbon dioxide fluid to dry the wet gel.

[0062] Based on step S106, the dried aerogel is gently placed in a clean crucible to ensure that the aerogel is not contaminated or damaged;

[0063] Then, the crucible was carefully moved into a tubular furnace and calcined for a certain period of time according to the set heating program, and then naturally cooled to room temperature. After the furnace temperature dropped to room temperature and the aerogel was completely cooled, the crucible was removed to obtain the zinc-cerium aerogel sensing material;

[0064] Specifically, the dried aerogel was gently placed in a clean crucible, and the crucible was carefully moved into a tubular furnace. The heating rate of the tubular furnace was set to 1-2°C / min, the calcination temperature was set to 500°C, the calcination time was set to 4h, and the zinc-cerium aerogel sensing material was obtained when it was naturally cooled to room temperature.

[0065] Figure 2 This is a graph of the N2 adsorption-desorption curve of the zinc-cerium aerogel sensing material for detecting acetone gas in an embodiment of the present invention, with a pore size distribution diagram attached. Figure 2 , it can be confirmed that the aerogel mesoporous structure is produced in this embodiment.

[0066] Figure 3 The final morphology of the zinc-cerium aerogel sensing material for detecting acetone gas according to the embodiment of the present invention is shown in FIG. Figure 3 , which can further confirm that the material microstructure is an aerogel structure.

[0067] Figure 4 This is a gas-sensing performance response diagram of the material obtained by the preparation method of zinc-cerium aerogel sensing material for detecting acetone gas in an acetone gas environment through steps S101-S106, referring to Figure 4The aerogel sensing material obtained by the preparation method of a zinc-cerium aerogel sensing material for detecting acetone gas according to an embodiment of the present invention has a high response to acetone at concentrations of 0.5 ppm, 1 ppm, 2 ppm, 5 ppm, and 10 ppm, and responds to 0.5 ppm of acetone, indicating that it has the advantage of a low detection limit. In addition, the response disappears after the acetone disappears, and it can respond again when the acetone reappears, fully utilizing the high specific surface area and high porosity of the aerogel material.

[0068] Figure 5 The five adsorption-desorption transient response graphs of the material obtained by the preparation method of the zinc-cerium aerogel sensing material for detecting acetone gas in 10 ppm acetone gas are shown in FIG. Figure 5 The aerogel sensing material obtained by the preparation method of a zinc-cerium aerogel sensing material for detecting acetone gas according to an embodiment of the present invention has a response value with very small fluctuation to 10 ppm acetone under 5 cycles, indicating that the material has good repeatability.

[0069] In summary, the embodiment of the present invention provides a method for preparing a zinc-cerium aerogel sensing material for detecting acetone, wherein anhydrous zinc chloride and anhydrous cerium chloride are mixed in a molar ratio of 1:2 in a solution of anhydrous ethanol and ultrapure water of 3:1, citric acid is added in a molar ratio of greater than or equal to 1:10 to anhydrous zinc chloride, and ethylene oxide is added in a molar ratio of greater than or equal to 1:2 to anhydrous zinc chloride, and dried in a 5L carbon dioxide supercritical drying device. Finally, the zinc-cerium aerogel sensing material for detecting acetone is prepared by passing through a tubular furnace in an air atmosphere at a heating rate of 1-2°C / min, a calcination temperature of 500°C, and a calcination time of 4h. The prepared sensing material has the advantages of high response to acetone, low detection limit, etc., and fully utilizes the characteristics of high specific surface area and high porosity of the aerogel material.

[0070] The basic principles, main features, and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for preparing a zinc-cerium aerogel sensing material for detecting acetone gas, characterized in that: The following steps are involved: Step S101: Anhydrous ethanol and ultrapure water are mixed uniformly, and then anhydrous zinc chloride is added to the mixture and stirred to completely dissolve, and then anhydrous cerium chloride is added thereto and stirred to obtain solution A; Step S102: Weigh citric acid and add it to solution A. After the citric acid is added, solution B is obtained, and the solution is stirred to form a stable coordination compound solution; Step S103: Weighing ethylene oxide and adding it to the coordination compound solution, stirring the coordination compound solution to obtain a precursor solution with stable performance; Step S104: Pour the precursor solution into an inverted syringe, place the syringe in a constant temperature environment and let it stand until the gel is completely formed, push the colloid in the syringe into a beaker, add anhydrous ethanol to the beaker to completely immerse the colloid, and replace the anhydrous ethanol at regular intervals; Step S105: transferring the replaced wet gel to a dedicated carbon dioxide supercritical drying device, starting the device, and gradually replacing and removing the solvent in the wet gel; Step S106: placing the dried aerogel in a crucible, moving the crucible into a tubular furnace, and calcining according to a set temperature increase program to obtain a zinc-cerium aerogel sensing material.

2. The method for preparing a zinc-cerium aerogel sensing material for detecting acetone gas according to claim 1, characterized in that: Based on step S101, anhydrous ethanol and ultrapure water are mixed uniformly in proportion. Subsequently, a certain amount of anhydrous zinc chloride is accurately weighed and added to the above mixture, and the mixture is stirred thoroughly to completely dissolve. Then, a certain amount of anhydrous cerium chloride is accurately weighed and added thereto, and the mixture is stirred continuously until a clear solution A is obtained.

3. The method for preparing a zinc-cerium aerogel sensing material for detecting acetone gas according to claim 1, characterized in that: Based on step S102, a specific mass of citric acid is weighed and slowly added to solution A. Stirring is performed during the addition of the citric acid to prevent local overconcentration or agglomeration. After the addition of the citric acid is completed, solution B is obtained. Then, solution B is placed on a blender and stirred at a certain speed for a certain time until the citric acid and the metal ions in the solution fully undergo coordination reaction to form a stable coordination compound solution.

4. The method for preparing a zinc-cerium aerogel sensing material for detecting acetone gas according to claim 1, characterized in that: Based on step S103, a certain amount of ethylene oxide is weighed, and solution B is placed in a magnetic stirrer and stirred by the magnetic stirrer. At this time, ethylene oxide is slowly added to the stable coordination compound while stirring. After the addition is completed, stirring is continued for a certain period of time to promote the cross-linking reaction between ethylene oxide and the active groups in the solution; During the stirring process, pay close attention to the viscosity changes and reaction conditions of the solution, and continue stirring until the solution viscosity is moderate and uniform to obtain a precursor solution with stable performance.

5. The method for preparing a zinc-cerium aerogel sensing material for detecting acetone gas according to claim 1, characterized in that: Based on step S104, the precursor solution is slowly loaded into an inverted syringe, and the syringe filled with the solution is placed in a constant temperature environment and allowed to stand to wait for gelation; After the gel is fully formed, push the colloid in the syringe into a clean beaker. Then, slowly pour anhydrous ethanol along the wall of the beaker until the anhydrous ethanol covers the colloid, ensuring that the colloid is completely immersed. At this time, seal the beaker mouth with plastic wrap to prevent ethanol from volatilizing and external impurities from entering; Replace the anhydrous ethanol at regular intervals and repeat this step 4-5 times to fully replace the residual water and organic matter in the gel to ensure the purity of the gel and the subsequent treatment effect.

6. The method for preparing a zinc-cerium aerogel sensing material for detecting acetone gas according to claim 1, characterized in that: Based on step S105, the wet gel after the solvent replacement treatment is carefully transferred to a dedicated carbon dioxide supercritical drying device. According to the equipment operating specifications, the equipment is started, and the solvent in the wet gel is gradually replaced and removed by the supercritical carbon dioxide fluid, thereby achieving gentle and uniform drying of the wet gel, and obtaining a dry aerogel with high porosity and low shrinkage.

7. The method for preparing a zinc-cerium aerogel sensing material for detecting acetone gas according to claim 1, characterized in that: Based on step S106, the dried aerogel is gently placed in a clean crucible to ensure that the aerogel is not contaminated or damaged; Then, the crucible was carefully moved into a tubular furnace and naturally cooled to room temperature after calcination for a certain period of time according to the set heating program. After the furnace temperature dropped to room temperature and the aerogel was completely cooled, the crucible was taken out to obtain the zinc-cerium aerogel sensing material.

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