Pollutant release and adsorption device and method in simulated space environment

Abstract

A pollutant release and adsorption device and method simulating a space environment, belonging to the field of pollution protection technology. The present invention solves the problem in the prior art that there is a lack of a device capable of conducting a space environment simulation adsorption performance test on molecular pollutants by adsorption materials on the ground. The quartz crystal microbalance, zeolite adsorption coating plate and pollutant release source are located on the same horizontal plane, the ultraviolet light emitted by the ultraviolet light source covers the coating surface of the zeolite adsorption coating plate, the heating radiation plate is connected to the temperature controller, and the vacuum degree in the vacuum chamber is controlled by a vacuum pump and a vacuum gauge. It can accurately control the temperature, vacuum degree, high-energy rays and other conditions to simulate the real aerospace environment, release space pollutant molecules in situ in a simulated aerospace environment, test the vacuum adsorption capacity of the adsorption material, and be equipped with a quartz crystal microbalance to monitor the volatilization rate of pollutants in real time to determine whether the adsorption has reached saturation.

Description

Technical Field

[0001] The invention relates to a pollutant release and adsorption device and method in a simulated aerospace environment, belonging to the technical field of pollution protection. Background Art

[0002] In recent years, my country has completed major aerospace projects represented by lunar exploration, Mars exploration, and space station construction, and China's aerospace technology has continued to reach new heights. After entering orbit, the spacecraft is in a high vacuum environment, and the materials used will release volatile organic gas molecules, which will cause serious contamination to its sensitive surfaces, causing degradation of optical, thermal and even electrical properties. Most spacecraft are equipped with equipment that is sensitive to molecular contamination. The risk of damage to related sensitive surfaces and reduced performance must be taken seriously by researchers and addressed in the early stages of instrument development. With increasingly stringent requirements for safety and reliability of spacecraft, contamination control has gradually become one of the key factors for the success of most space missions.

[0003] In order to accurately evaluate the adsorption performance of adsorbent materials on molecular pollutants in the space environment, in addition to conducting flight test research in space, space environment simulation tests on the ground are essential. The space environment of a spacecraft is complex and changeable. The temperature of a spacecraft on orbit may vary between -200℃ and 100℃, and the vacuum degree of a spacecraft at different altitudes on orbit will vary. The vacuum degree range is generally 10 -4 ~10 -12 Pa. In addition, vacuum high-energy radiation represented by ultraviolet rays will have a synergistic effect with pollutant molecules, greatly increasing the difficulty of testing. Therefore, developing a pollutant release and adsorption device that simulates the aerospace environment, which can achieve real-time monitoring of the pollutant gas volatilization process, accurately simulate the temperature and vacuum changes in the complex aerospace environment, and simulate the synergistic effect between ultraviolet rays and pollutant molecules, will provide guidance for the development of adsorption materials for molecular contamination control. Summary of the invention

[0004] The present invention aims to solve the above technical problems and further provides a pollutant release and adsorption device and method in a simulated aerospace environment.

[0005] The technical solution adopted by the present invention to solve the above technical problems is:

[0006] A pollutant release and adsorption device simulating a space environment comprises a vacuum chamber, a pollutant release source installed on the vacuum chamber, an ultraviolet light source, a vacuum pump, a vacuum gauge and a temperature controller, and a quartz crystal microbalance, a heating radiation plate, a zeolite adsorption coating plate and a liquid helium circulation device installed in the vacuum chamber, wherein the quartz crystal microbalance, the zeolite adsorption coating plate and the pollutant release source are located in the same horizontal plane and the zeolite adsorption coating plate and the pollutant release source are arranged opposite each other, the ultraviolet light emitted by the ultraviolet light source covers the coating surface of the zeolite adsorption coating plate, the heating radiation plate is connected to the temperature controller, the vacuum degree in the vacuum chamber is controlled by the vacuum pump and the vacuum gauge, and the vacuum pumping port on the vacuum chamber connected to the vacuum pump is located on the side of the quartz crystal microbalance away from the zeolite adsorption coating plate.

[0007] Furthermore, the distance between the quartz crystal microbalance and the zeolite adsorption coating plate is less than or equal to 5 cm.

[0008] Furthermore, the distance between the zeolite adsorption coating plate and the pollutant release source is 10 cm to 13 cm.

[0009] Furthermore, the ultraviolet light source is a nitrogen laser, an argon discharge lamp or a deuterium discharge lamp.

[0010] Furthermore, the vacuum pump includes a mechanical pump and a molecular pump.

[0011] Furthermore, the vacuum chamber body is a cylindrical structure.

[0012] Furthermore, the vacuum chamber body is made of stainless steel.

[0013] Furthermore, a heating device and a pollutant storage device are provided in the pollutant release source.

[0014] Furthermore, the vacuum chamber body is provided with a chamber door and an air release valve.

[0015] A method for using the above-mentioned pollutant release and adsorption device in a simulated aerospace environment comprises the following steps:

[0016] Step 1, weighing the mass m1 of the zeolite adsorption coating plate before adsorption, and then placing the zeolite adsorption coating plate in the vacuum chamber;

[0017] Step 2: evacuate the vacuum chamber until the required vacuum degree is reached;

[0018] Step 3: Select and start the heating radiation plate or the liquid helium circulation device according to the test temperature setting value;

[0019] Step 4: Turn on the ultraviolet light source to expose the coating surface of the zeolite adsorption coating plate to ultraviolet radiation;

[0020] Step 5: Control the heating of the pollutant release source to start releasing molecular pollutants. The pollutant release time is 3 to 6 days, and the pollutant molecules are adsorbed on the zeolite adsorption coating plate;

[0021] Step 6: Record the data change of the quartz crystal microbalance and the adsorption time;

[0022] Step 7: After the zeolite adsorption coating plate is saturated with adsorption, the adsorption process is completed, the heating radiation plate or the liquid helium circulation device is turned off, and the ultraviolet light source and the pollutant release source are turned off. After the temperature displayed by the temperature controller is close to room temperature, the vacuum pump is turned off;

[0023] Step 8: After the vacuum degree in the vacuum chamber reaches normal pressure, take out the zeolite adsorption coating plate, weigh the mass m2 of the zeolite adsorption coating plate after adsorption, calculate its saturated adsorption capacity, and the operation is completed.

[0024] Compared with the prior art, the present invention has the following effects:

[0025] The device of the present invention can accurately control conditions such as temperature, vacuum degree and high-energy rays to simulate a real aerospace environment, and release space pollutant molecules in situ in a simulated aerospace environment, test the vacuum adsorption capacity of the adsorption material, and be equipped with a quartz crystal microbalance to monitor the volatilization rate of pollutants in real time to determine whether the adsorption has reached saturation. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 The figure is a top view schematic diagram of a pollutant release and adsorption device in a simulated aerospace environment according to the present invention.

[0027] In the figure: 1. Vacuum chamber; 2. Pollutant release source; 3. Ultraviolet light source; 4. Mechanical pump; 5. Vacuum pump; 6. Vacuum gauge; 7. Temperature controller; 8. Quartz crystal microbalance; 9. Heating radiation plate; 10. Zeolite adsorption coating plate; 11. Liquid helium circulation device; 11-1. Liquid helium inlet; 11-2. Liquid helium outlet; 12. Chamber door; 13. Release valve. DETAILED DESCRIPTION

[0028] Specific implementation method 1: Combination Figure 1The present embodiment is described as a pollutant release and adsorption device simulating a space environment, comprising a vacuum chamber 1, a pollutant release source 2 installed on the vacuum chamber 1, an ultraviolet light source 3, a vacuum pump, a vacuum gauge 6 and a temperature controller 7, and a quartz crystal microbalance 8, a heating radiation plate 9, a zeolite adsorption coating plate 10 and a liquid helium circulation device 11 installed in the vacuum chamber 1, wherein the quartz crystal microbalance 8, the zeolite adsorption coating plate 10 and the pollutant release source 2 are located in the same horizontal plane and the zeolite adsorption coating plate 10 and the pollutant release source 2 are arranged opposite each other, the ultraviolet light emitted by the ultraviolet light source 3 covers the coating surface of the zeolite adsorption coating plate 10, the heating radiation plate 9 is connected to the temperature controller 7, the vacuum degree in the vacuum chamber 1 is controlled by the vacuum pump and the vacuum gauge 6, and the vacuum port on the vacuum chamber 1 connected to the vacuum pump is located on the side of the quartz crystal microbalance 8 away from the zeolite adsorption coating plate 10.

[0029] Porous adsorption materials such as zeolite molecular sieves have large specific surface areas and rich pore structures, and are highly potential adsorption materials for molecular pollutants.

[0030] Molecular contaminants are room temperature curing structural adhesives, silicone oils, pump oils, hydrocarbons or esters.

[0031] The quartz crystal microbalance 8 and the zeolite adsorption coating plate 10 are respectively fixed in the vacuum chamber body 1 through mounting frames.

[0032] There are multiple zeolite adsorption coating plates 10 and they are laid on their corresponding mounting frames, and the mounting frames for mounting the zeolite adsorption coating plates 10 are located at the central axis of the cylindrical vacuum chamber 1. The two mounting frames are mounted in the vacuum chamber 1 through a fixing plate.

[0033] The quartz crystal microbalance, the zeolite adsorption coating plate and the pollutant release source are located at the same horizontal plane and the zeolite adsorption coating plate and the pollutant release source are arranged opposite each other. Specifically, the volume of the zeolite adsorption coating plate 10 is much smaller than the volume of the pollutant release source 2. When arranging the position, it is only necessary to ensure that the zeolite adsorption coating plate 10 is in the space opposite to the pollutant release source 2. The vacuum port connected to the vacuum pump on the vacuum chamber is located on the side of the quartz crystal microbalance away from the zeolite adsorption coating plate to avoid affecting the adsorption of pollutants due to the vacuum port facing the zeolite adsorption coating plate 10.

[0034] The heating radiation plate 9 and the liquid helium circulation device 11 are installed on the inner wall of the vacuum chamber body 1; the heating radiation plate 9 is connected to the temperature controller 7, and the temperature in the vacuum chamber body 1 is controlled by the temperature controller 7 during heating. The temperature at which the molecular pollutants are released is the same as the temperature of the heating radiation plate, or the temperature difference between the two is in the range of 0 to 5°C, which is more conducive to the full release and volatilization of the molecular pollutants.

[0035] The liquid helium circulation device 11 is connected to a liquid helium inlet 11 - 1 and a liquid helium outlet 11 - 2 .

[0036] The device of the present invention can accurately control the conditions such as temperature, vacuum degree and high-energy rays to simulate the real aerospace environment, and release the space pollutant molecules in situ in the simulated aerospace environment, test the vacuum adsorption capacity of the adsorption material, and is equipped with a quartz crystal microbalance 8 to monitor the volatilization rate of the pollutants in real time to determine whether the adsorption has reached saturation.

[0037] The distance between the quartz crystal microbalance 8 and the zeolite adsorption coating plate 10 is less than or equal to 5 cm.

[0038] The distance between the zeolite adsorption coating plate 10 and the pollutant release source 2 is 10 cm to 13 cm.

[0039] The ultraviolet light source 3 is a nitrogen laser, an argon discharge lamp or a deuterium discharge lamp.

[0040] The vacuum pump includes a mechanical pump 4 and a molecular pump 5 .

[0041] The vacuum chamber body 1 is a cylindrical structure with an inner diameter of 25 cm and a height of 50 cm.

[0042] The vacuum chamber body 1 is made of stainless steel.

[0043] The pollutant release source 2 is provided with a heating device and a pollutant storage device.

[0044] The vacuum chamber body 1 is provided with a chamber door 12 and a deflation valve 13 .

[0045] A method for using the above-mentioned pollutant release and adsorption device in a simulated aerospace environment comprises the following steps:

[0046] Step 1, weigh the mass m1 of the zeolite adsorption coating plate 10 before adsorption, and then place the zeolite adsorption coating plate 10 in the vacuum chamber 1; in the process of fixing the zeolite adsorption coating plate 10, first open the chamber door 12, then place the zeolite adsorption coating plate 10 on the mounting frame, and then close the chamber door 12.

[0047] Step 2: Use a vacuum pump to evacuate the vacuum chamber 1 until the required vacuum degree is reached; use different vacuum pumps according to different vacuum degree requirements, such as: if the test vacuum degree setting value is from normal pressure to 1×10 -1 Pa, a mechanical pump 4 is used; if the test vacuum setting value is 1×10 -4 ~1×10 -12 Pa, first use mechanical pump 4 to evacuate to 1×10 -1Pa, then turn off the mechanical pump 4 and turn on the molecular pump 5 until the set value is reached.

[0048] Step 3, according to the test temperature setting value, the heating radiation plate 9 or the liquid helium circulation device 11 is selected to start; when the test temperature setting value is high temperature, the heating radiation plate 9 is heated and the temperature in the vacuum chamber 1 is controlled by the temperature controller 7 to reach room temperature to 100°C, so as to obtain a high temperature environment; when the test temperature setting value is low temperature, liquid helium is slowly introduced into the liquid helium inlet 11-1 of the liquid helium circulation device 11, and the temperature in the vacuum chamber 1 is controlled by the temperature controller 7 to reach room temperature to -200°C, so as to obtain a low temperature environment.

[0049] Step 4: Turn on the ultraviolet light source 3 to expose the coating surface of the zeolite adsorption coating plate 10 to ultraviolet radiation;

[0050] Step 5: Control the pollutant release source 2 to heat up, so that molecular pollutants begin to be released. The pollutant release time is 3 to 6 days, and the pollutant molecules are adsorbed on the zeolite adsorption coating plate 10;

[0051] Step 6: Record the data change of the quartz crystal microbalance 8 and the adsorption time; by recording the data change of the quartz crystal microbalance 8 and the adsorption time, the molecular pollutant flux escaping from the instrument can be calculated, that is, the pollutant flow rate passing through a unit area per unit time. The quartz crystal microbalance 8 has a good indication function. According to the change of the detected pollutant flux, it can be judged whether the zeolite adsorption coating plate 10 is close to or reaches the saturated adsorption amount (the pollutant flux no longer changes, that is, the adsorption saturation is reached).

[0052] Step 7: After the zeolite adsorption coating plate 10 is saturated with adsorption, the adsorption process is completed, the heating radiation plate 9 or the liquid helium circulation device 11 is turned off, and the ultraviolet light source 3 and the pollutant release source 2 are turned off. After the temperature displayed by the temperature controller 7 is close to room temperature, the vacuum pump is turned off;

[0053] Step 8, open the vent valve 13 until the vacuum degree in the vacuum chamber 1 reaches normal pressure, and then close the vent valve 13;

[0054] Step nine, open the door 12, take out the zeolite adsorption coating plate 10, weigh the mass m2 of the zeolite adsorption coating plate 10 after adsorption, calculate its saturated adsorption capacity, and the operation is finished.

[0055] To better simulate the pollutant release process in a flight environment, i.e. the slow expulsion of heavier, less volatile pollutant molecules, the impure pollutant source materials are “aged” by baking at high temperature in a thermal vacuum (TVAC) chamber for 8 to 10 hours to deplete highly volatile pollutants.

[0056] Specific implementation method 2: A method for using the above-mentioned pollutant release and adsorption device in a simulated aerospace environment, wherein the simulated temperature is -200°C and the high vacuum degree is 1×10 -7 Under Pa space environment conditions, the commonly used plasticizer dioctyl phthalate (DOP) is used as a pollutant source for release and adsorption. It includes the following steps:

[0057] Step 1, weigh the mass m1 of the zeolite adsorption coating plate 10 before adsorption, then open the door 12, place the zeolite adsorption coating plate 10 on the mounting frame in the vacuum chamber 1, and close the door 12;

[0058] Step 2: Use the mechanical pump 4 to evacuate the vacuum chamber 1 until the vacuum gauge 6 shows a vacuum degree of 1×10 - 1 Pa; then turn off the mechanical pump 4 and turn on the molecular pump 5 until the vacuum gauge 6 shows that the vacuum degree reaches 1×10 -7 Pa;

[0059] Step 3: slowly pass liquid helium into the liquid helium inlet 11-1 of the liquid helium circulation device 11, and control the temperature in the vacuum chamber 1 to reach room temperature to -200°C through the temperature controller 7;

[0060] Step 4: Turn on the ultraviolet light source 3 to expose the coating surface of the zeolite adsorption coating plate 10 to the ultraviolet radiation of the deuterium discharge lamp;

[0061] Step 5: Control the pollutant release source 2 to heat to 120°C to make the molecular pollutant dioctyl phthalate (DOP, the chemical formula of DOP is C 24 H 38 O4, molecular weight is 390.56g / mol. Its appearance is described as a colorless, odorless, oily non-volatile liquid, with a large volatility at 120°C) released from the pollutant release source 2, the pollutant release time is 6 days, and the pollutant molecules are adsorbed on the zeolite adsorption coating plate 10;

[0062] Step 6: Record the data change of the quartz crystal microbalance 8 and the adsorption time; by recording the data change of the quartz crystal microbalance 8 and the adsorption time, the molecular pollutant flux escaping from the instrument can be calculated, that is, the pollutant flow rate passing through a unit area per unit time. The quartz crystal microbalance 8 has a good indication function. According to the change of the detected pollutant flux, it can be judged whether the zeolite adsorption coating plate 10 is close to or reaches the saturated adsorption amount (the pollutant flux no longer changes, that is, the adsorption saturation is reached).

[0063] Step 7: After the zeolite adsorption coating plate 10 is saturated with adsorption, the adsorption process is completed, the liquid helium circulation device 11 is turned off, and the ultraviolet light source 3 and the pollutant release source 2 are turned off. After the temperature displayed by the temperature controller 7 is close to room temperature, the molecular pump 5 and the mechanical pump 4 are turned off;

[0064] Step 8, open the vent valve 13 until the vacuum degree in the vacuum chamber 1 reaches normal pressure, and then close the vent valve 13;

[0065] Step nine, open the door 12, take out the zeolite adsorption coating plate 10, weigh the mass m2 of the zeolite adsorption coating plate 10 after adsorption, calculate its saturated adsorption capacity, and the operation is finished.

[0066] Specific implementation method three: A method for using the above-mentioned pollutant release and adsorption device in a simulated aerospace environment, wherein the simulated vacuum degree is 1×10 -5 Under the conditions of Pa and temperature of 100°C (the long-term use temperature range of black polyimide film material is 73-573K, and the boiling point is higher than 180K), the release and adsorption of pollutant molecules degassed by the black polyimide film material. It includes the following steps:

[0067] Step 1. The polyimide film material is "aged" by baking at 50°C in a thermal vacuum (TVAC) chamber for 9 hours to exhaust highly volatile pollutants. The black polyimide film material is placed in the pollutant release source 2. The black polyimide film material used is a single sheet of material with a thickness of 30.48cm×25.88cm×0.00198cm. The entire sheet of material used is folded with 3.08 cm wide folds and fixed with pre-cleaned metal clips; weigh the mass m1 of the zeolite adsorption coating plate 10 before adsorption, then open the chamber door 12, place the zeolite adsorption coating plate 10 on the mounting rack in the vacuum chamber body 1, and close the chamber door 12;

[0068] Step 2: Use the mechanical pump 4 to evacuate the vacuum chamber 1 until the vacuum gauge 6 shows a vacuum degree of 1×10 - 1 Pa; then turn off the mechanical pump 4 and turn on the molecular pump 5 until the vacuum gauge 6 shows that the vacuum degree reaches 1×10 -5 Pa;

[0069] Step 3: Heat the heating radiation plate 9 and control the temperature in the vacuum chamber 1 to reach room temperature to 100° C. through the temperature controller 7;

[0070] Step 4: Turn on the ultraviolet light source 3 to expose the coating surface of the zeolite adsorption coating plate 10 to the ultraviolet radiation of the deuterium discharge lamp;

[0071] Step 5: Control the pollutant release source 2 to heat to 100° C., so that the molecular pollutants of the polyimide film material begin to be released from the pollutant release source 2. The pollutant release time is 6 days, and the pollutant molecules are adsorbed on the zeolite adsorption coating plate 10;

[0072] Step 6: Record the data change of the quartz crystal microbalance 8 and the adsorption time; by recording the data change of the quartz crystal microbalance 8 and the adsorption time, the molecular pollutant flux escaping from the instrument can be calculated, that is, the pollutant flow rate passing through a unit area per unit time. The quartz crystal microbalance 8 has a good indication function. According to the change of the detected pollutant flux, it can be judged whether the zeolite adsorption coating plate 10 is close to or reaches the saturated adsorption amount (the pollutant flux no longer changes, that is, the adsorption saturation is reached).

[0073] Step 7: After the zeolite adsorption coating plate 10 is saturated with adsorption, the adsorption process ends, the heating radiation plate 9 is turned off, and the ultraviolet light source 3 and the pollutant release source 2 are turned off. After the temperature displayed by the temperature controller 7 is close to room temperature, the molecular pump 5 and the mechanical pump 4 are turned off;

[0074] Step 8, open the vent valve 13 until the vacuum degree in the vacuum chamber 1 reaches normal pressure, and then close the vent valve 13;

[0075] Step nine, open the door 12, take out the zeolite adsorption coating plate 10, weigh the mass m2 of the zeolite adsorption coating plate 10 after adsorption, calculate its saturated adsorption capacity, and the operation is finished.

Claims

1. A pollutant release and adsorption device simulating a space environment, characterized in that: The invention comprises a vacuum chamber (1), a pollutant release source (2) installed on the vacuum chamber (1), an ultraviolet light source (3), a vacuum pump, a vacuum gauge (6) and a temperature controller (7), and a quartz crystal microbalance (8), a heating radiation plate (9), a zeolite adsorption coating plate (10) and a liquid helium circulation device (11) installed in the vacuum chamber (1), wherein the quartz crystal microbalance (8), the zeolite adsorption coating plate (10) and the pollutant release source (2) are located on the same horizontal plane. The zeolite adsorption coating plate (10) and the pollutant release source (2) are arranged opposite to each other, the ultraviolet light emitted by the ultraviolet light source (3) covers the coating surface of the zeolite adsorption coating plate (10), the heating radiation plate (9) is connected to the temperature controller (7), and the vacuum degree in the vacuum chamber (1) is controlled by a vacuum pump and a vacuum gauge (6), and the vacuum pump port on the vacuum chamber (1) connected to the vacuum pump is located on a side of the quartz crystal microbalance (8) away from the zeolite adsorption coating plate (10); The heating radiation plate (9) and the liquid helium circulation device (11) are installed on the inner wall of the vacuum chamber body 1; The quartz crystal microbalance (8) and the zeolite adsorption coating plate (10) are respectively fixed in the vacuum chamber body (1) through mounting frames; The distance between the quartz crystal microbalance (8) and the zeolite adsorption coating plate (10) is less than or equal to 5 cm; the distance between the zeolite adsorption coating plate (10) and the pollutant release source (2) is 10 cm to 13 cm; The pollutant release source (2) is provided with a heating device and a pollutant storage device.

2. The pollutant release and adsorption device in a simulated aerospace environment according to claim 1, characterized in that: The ultraviolet light source (3) is a nitrogen laser, an argon discharge lamp or a deuterium discharge lamp.

3. The pollutant release and adsorption device in a simulated aerospace environment according to claim 1, characterized in that: The vacuum pump comprises a mechanical pump (4) and a molecular pump (5).

4. The pollutant release and adsorption device in a simulated aerospace environment according to claim 1, characterized in that: The vacuum chamber body (1) is a cylindrical structure.

5. The pollutant release and adsorption device in a simulated aerospace environment according to claim 1, characterized in that: The vacuum chamber body (1) is made of stainless steel.

6. The pollutant release and adsorption device in a simulated aerospace environment according to claim 1, characterized in that: The vacuum chamber body (1) is provided with a chamber door (12) and an air release valve (13).

7. A method for using the pollutant release and adsorption device in a simulated aerospace environment as described in any one of claims 1 to 6, characterized in that: The steps include: Step 1, weighing the mass m1 of the zeolite adsorption coating plate (10) before adsorption, and then placing the zeolite adsorption coating plate (10) in the vacuum chamber (1); Step 2: evacuate the vacuum chamber (1) until the required vacuum degree is reached; Step 3: Select and start the heating radiation plate (9) or the liquid helium circulation device (11) according to the test temperature setting value; Step 4: Turn on the ultraviolet light source (3) to expose the coating surface of the zeolite adsorption coating plate (10) to ultraviolet radiation; Step 5: Controlling the pollutant release source (2) to heat up, so that molecular pollutants begin to be released. The pollutant release time is 3 to 6 days, and the pollutant molecules are adsorbed on the zeolite adsorption coating plate (10); Step 6, recording the data change of the quartz crystal microbalance (8) and recording the adsorption time; Step 7: After the zeolite adsorption coating plate (10) is saturated with adsorption, the adsorption process is completed, the heating radiation plate (9) or the liquid helium circulation device (11) is turned off, and the ultraviolet light source (3) and the pollutant release source (2) are turned off. After the temperature displayed by the temperature controller (7) is close to room temperature, the vacuum pump is turned off; Step 8: After the vacuum degree in the vacuum chamber (1) reaches normal pressure, take out the zeolite adsorption coating plate (10), weigh the mass m2 of the zeolite adsorption coating plate (10) after adsorption, calculate its saturated adsorption capacity, and the operation is completed.

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