Preparation method and application of potassium permanganate alumina ball air purification filter material

Abstract

The invention relates to the technical field of air purification, in particular to a preparation method and application of a potassium permanganate alumina ball air purification filter material, the preparation method comprises the following steps: S1, cleaning and drying an activated alumina ball to obtain a pretreated alumina ball; s2, dissolving potassium permanganate in deionized water, and adding a stabilizer to prepare a potassium permanganate solution; s3, adding the pretreated alumina balls into a potassium permanganate solution to obtain impregnated alumina balls; s4, taking out the impregnated alumina balls, and drying to obtain dried alumina balls; s5, soaking the dried alumina balls in an organic acid solution, taking out the alumina balls, leaching the alumina balls, and drying the alumina balls to obtain treated alumina balls; and S6, putting the treated aluminum oxide balls into a sealed container, and aging to obtain the aluminum oxide balls. The potassium permanganate alumina ball air purification filter material obtained by the preparation method has the advantages of uniform potassium permanganate loading, firm combination, good stability and high purification efficiency.

Description

Technical Field

[0001] This invention relates to the field of air purification technology, specifically to a method for preparing and applying potassium permanganate alumina sphere air purification filter media. Background Technology

[0002] With industrial development and the widespread adoption of indoor decoration, gaseous pollutants such as hydrogen sulfide, formaldehyde, mercaptans, and nitrogen oxides present in industrial waste gas and indoor environments pose a serious threat to human health and the ecological environment due to their low concentration, high toxicity, and strong odor. Therefore, the development of efficient and stable air purification filter materials has become an urgent need.

[0003] Currently, mainstream air purification materials have significant limitations. Activated carbon relies solely on physical adsorption, resulting in low adsorption capacity for polar small molecule pollutants, easy desorption, and easy secondary release of pollutants after saturation. Potassium permanganate alone has strong oxidizing properties, but without a carrier, it is prone to deliquescence, has poor dispersibility, and a small contact area with gases, leading to low purification efficiency and difficulty in engineering applications. Ordinary alumina only has physical adsorption capabilities and lacks chemical oxidation effects, making it unable to effectively remove malodorous and toxic gaseous pollutants and failing to meet actual purification needs.

[0004] To address the aforementioned issues, composite oxidation filter media have gradually become a research hotspot, with potassium permanganate alumina balls being a core category. These balls achieve a synergistic effect of physical adsorption and chemical oxidation by loading potassium permanganate onto a porous activated alumina carrier. Activated alumina, as the carrier, possesses advantages such as high specific surface area, large pore volume, good mechanical strength, and strong thermal stability, providing ample contact interfaces. Potassium permanganate, as the active component, oxidizes pollutants into non-toxic or low-toxic substances and then reduces itself to solid MnO2, preventing secondary pollution.

[0005] In the prior art, patent CN117718004A discloses a method for regenerating alumina balls loaded with potassium permanganate, which includes washing deactivated alumina balls with a C6H8O6 aqueous solution at a mass ratio of 0.25~2, mixing the washed alumina balls with a C6H8O6 aqueous solution and an AsO2 aqueous solution, sealing and ultrasonically treating; then drying the ultrasonically treated alumina balls and reloading them with potassium permanganate. This application pretreats deactivated alumina microspheres using a C6H8O6 aqueous solution, which opens up the pore structure of the alumina microspheres, removing attached byproducts such as elemental sulfur and manganese dioxide, thus achieving regeneration without reacting with the alumina microspheres to generate impurities. Then, using an AsO2 solution and a C6H8O6 aqueous solution, combined with ultrasonic assistance, the impurities attached to the micropores / mesopores of the alumina microspheres are removed, increasing the specific surface area of ​​the alumina microspheres and allowing them to be reloaded with potassium permanganate. Finally, the regenerated alumina microspheres are mixed with a potassium permanganate solution and loaded using ultrasonic methods, achieving the effect of removing acidic gases. However, C6H8O6 is a strong reducing agent, while potassium permanganate is a strong oxidizing agent. If ascorbic acid remains inside the alumina microspheres, a redox reaction may occur during subsequent loading of potassium permanganate, leading to the reduction of potassium permanganate and a decrease in the loading capacity.

[0006] Therefore, there is an urgent need in the market for a potassium permanganate alumina ball with a high load capacity. Summary of the Invention

[0007] To address the problems existing in the prior art, the purpose of this invention is to develop a method for preparing alumina ball air purification filter media with high potassium permanganate loading, uniform loading, strong bonding, good stability, and high purification efficiency.

[0008] To achieve the above objectives, the technical solution adopted by the present invention is as follows: The first aspect of this invention provides a method for preparing potassium permanganate alumina sphere air purification filter media, comprising the following steps: S1. Place the activated alumina balls in deionized water and ultrasonically clean for 10-30 minutes, then dry them at 100-120℃ for 2-4 hours to obtain pretreated alumina balls. S2. Dissolve potassium permanganate in deionized water, add stabilizer, and prepare a potassium permanganate solution with a mass concentration of 5%-15%. S3. Place the pretreated alumina balls obtained in step S1 into a vacuum impregnation device, evacuate to -0.08~-0.1MPa, maintain for 10-20min, then add the potassium permanganate solution obtained in step S2, so that the solution completely immerses the alumina balls, maintain the vacuum degree, impregnate for 1-3h, and obtain the impregnated alumina balls. S4. Take out the impregnated alumina balls obtained in step S3, drain off the excess solution on the surface, place them in a microwave drying device, and dry them at 60-80℃ for 1-2 hours to obtain dried alumina balls. S5. Soak the dried alumina balls from step S4 in an organic acid solution with a concentration of 0.5-2wt% for 10-30 minutes. After removing them, rinse them with deionized water and then dry them at 50-70℃ for 30-60 minutes to obtain the treated alumina balls. S6. Place the treated alumina balls obtained in step S5 in a sealed container and age them at 20-30℃ for 12-24 hours to obtain the potassium permanganate alumina ball air purification filter material.

[0009] This application employs a pretreatment process involving ultrasonic cleaning and high-temperature drying of activated alumina spheres. This effectively removes surface dust and impurities, unclogs pores, improves the impregnation efficiency of potassium permanganate solution, and completely removes physically adsorbed water, avoiding interference with the dilution of potassium permanganate solution. This, in turn, increases the effective specific surface area of ​​the activated alumina and enhances its loading capacity. Furthermore, the addition of a stabilizer effectively prevents potassium permanganate decomposition, extending the solution's shelf life. The unique processes of vacuum impregnation and microwave drying significantly improve the effective loading and distribution uniformity of potassium permanganate, and solve the problem of potassium permanganate "surface enrichment" in air purification filter media preparation. This results in air purification filter media with advantages such as uniform potassium permanganate loading, strong bonding, good stability, and high purification efficiency.

[0010] In some embodiments, the stabilizer is a combination of sodium silicate and modified β-cyclodextrin.

[0011] Preferably, the mass ratio of sodium silicate to modified β-cyclodextrin is 1:(5-10).

[0012] Compared to conventional technologies that use only sodium silicate as a stabilizer, this application further enhances the air purification effect of potassium permanganate alumina balls by selecting a combination of sodium silicate and modified β-cyclodextrin as a stabilizer. Sodium silicate acts as an inorganic binder, fixing potassium permanganate to the framework and preventing physical detachment; modified cyclodextrin captures pollutants and delivers them to the potassium permanganate, while preventing the potassium permanganate from absorbing moisture, migrating, or agglomerating, thus ensuring the stable effectiveness of the potassium permanganate. The combination of these two components guarantees the stability of potassium permanganate from both physical and chemical perspectives.

[0013] In some embodiments, the amount of stabilizer added is 0.5%-2% of the mass of potassium permanganate.

[0014] In some embodiments, the method for preparing the modified β-cyclodextrin includes the following steps: A1. Add β-cyclodextrin to sodium hydroxide solution and stir at 50-60℃ for 1-2 hours to obtain cyclodextrin activated solution; A2. Slowly add rare earth salt solution to the cyclodextrin activation solution obtained in step A1, adjust the pH value to 5.5-7.0, and stir the reaction at a constant temperature of 40-70℃ for 2-4 hours. After the reaction is completed, wash with deionized water 2-3 times, and then vacuum dry at 40-50℃ to constant weight to obtain modified β-cyclodextrin.

[0015] Preferably, the concentration of the sodium hydroxide solution is 1-2 mol / L.

[0016] Preferably, the ratio of β-cyclodextrin to sodium hydroxide solution is 1g:(8-15)ml.

[0017] This application enables rare earth metal ions to coordinate with β-cyclodextrin to obtain modified β-cyclodextrin. Using it as a stabilizer in the preparation method of air purification filter media can increase the potassium permanganate loading on the air purification filter media and make the air purification filter media have higher stability and purification efficiency. This may be because, firstly, during the impregnation and loading stage of preparation, modified β-cyclodextrin can act as a surfactant, allowing the potassium permanganate solution to spread more evenly within the pores of the alumina spheres. This prevents potassium permanganate crystals from agglomerating into large particles and clogging the pores after drying, ensuring that the potassium permanganate is highly dispersed in a microcrystalline or thin-layer state, maximizing the exposure of active sites and improving the purification efficiency per unit mass. Secondly, during the use of the filter media, modified β-cyclodextrin retains complete hydrophobic cavities. When air flows through, the cavities can capture and enrich gaseous pollutants such as formaldehyde and toluene from the low-concentration environment around the potassium permanganate through host-guest interactions. This enrichment increases the collision probability between potassium permanganate and pollutants, making the oxidation reaction more complete and faster. Thirdly, rare earth elements... The rare earth elements are modified on the surface of cyclodextrin through coordination bonds, forming a charged protective layer. This protective layer can generate electrostatic interactions with permanganate ions in the impregnation solution, regulating their distribution on the carrier. After drying, this organic-inorganic hybrid membrane can physically block moisture in the air, preventing potassium permanganate from deliquescing and becoming ineffective due to moisture absorption, significantly extending the storage life and service life of the filter media, and solving the common problem of "moisture sensitivity" in potassium permanganate filter media. Fourth, the rare earth elements anchored on the surface of cyclodextrin have redox activity. During the reaction, rare earth elements can activate the chemical bonds in pollutant molecules, making them easier to be oxidized by potassium permanganate, reducing the activation energy of the oxidation reaction, so that the filter media can maintain a high removal efficiency for refractory volatile organic compounds even under normal temperature conditions. Meanwhile, this application removes free rare earth elements by adding a water washing process, avoiding direct contact reaction between rare earth ions and potassium permanganate during the liquid phase impregnation process, ensuring the effective loading rate of the active components of potassium permanganate, and overcoming the technical defect of potassium permanganate instability caused by redox reaction due to direct doping of rare earth elements in the prior art.

[0018] In some embodiments, the concentration of the rare earth salt solution is 0.05-0.15 mol / L.

[0019] In some embodiments, the rare earth salt solution is one or more of cerium nitrate solution, lanthanum nitrate solution, and cerium chloride solution.

[0020] In some embodiments, the ratio of the β-cyclodextrin to the rare earth salt solution is 1g:(10-30)ml.

[0021] In some embodiments, the organic acid solution is selected from one or more of citric acid solution, tartaric acid solution, or ascorbic acid solution.

[0022] Preferably, the organic acid solution is a citric acid solution.

[0023] The second aspect of this invention provides the application of potassium permanganate alumina sphere air purification filter media obtained by the above preparation method in air purification.

[0024] In some embodiments, the air purification includes removing at least one of hydrogen sulfide, sulfur dioxide, formaldehyde, and volatile organic compounds from the air.

[0025] Compared with the prior art, the present invention has the following beneficial effects: (1) The present invention significantly improves the effective loading and distribution uniformity of potassium permanganate by using a special process of ultrasonic cleaning and high temperature drying pretreatment of alumina, adding stabilizers, vacuum impregnation and microwave drying, and solves the problem of potassium permanganate “surface enrichment” in the preparation of air purification filter material, so that the air purification filter material has the advantages of uniform potassium permanganate loading, strong bonding, good stability and high purification efficiency.

[0026] (2) The present invention obtains modified β-cyclodextrin by coordinating rare earth metal ions with β-cyclodextrin. Using it as a stabilizer in the preparation method of air purification filter material can increase the loading of potassium permanganate on the air purification filter material and make the air purification filter material have higher stability and purification efficiency.

[0027] (3) The present invention removes free rare earth by adding a water washing process, avoiding direct contact reaction between rare earth ions and potassium permanganate during liquid phase impregnation, ensuring the stability of the active component of potassium permanganate and thus improving its loading rate. Detailed Implementation

[0028] The present invention will be described below with reference to specific embodiments. It should be noted that the following embodiments are examples of the present invention and are used only to illustrate the invention, not to limit it. Other combinations and various modifications within the scope of the present invention can be made without departing from its spirit or scope.

[0029] In the following examples and comparative examples, except for the activated alumina balls, all other compounds and related reagents used were commercially available. The activated alumina balls had a particle size of 3-5 mm and a pore volume of 0.6 cm³. 3 / g, purchased from Luoyang Ruipeng Water Purification Materials Co., Ltd.

[0030] Preparation Example 1 The preparation method of modified β-cyclodextrin-1 includes the following steps: A1. Dissolve 1g of β-cyclodextrin in 12ml of 1mol / L sodium hydroxide aqueous solution and stir at 55℃ for 1.5h to obtain cyclodextrin activated solution; A2. Slowly add 20 ml of 0.1 mol / L cerium nitrate solution to the cyclodextrin activation solution obtained in step A1 at a dropping rate of 2 drops / s. Adjust the pH value to 6 using 1M dilute hydrochloric acid. Stir the reaction at 55℃ for 3 hours. After the reaction is completed, wash the solution three times with deionized water and then dry it under vacuum at 45℃ to constant weight to obtain modified β-cyclodextrin-1.

[0031] Preparation Example 2 The preparation method of modified β-cyclodextrin-2 is the same as that in Preparation Example 1, except that the amount of cerium nitrate solution with a concentration of 0.1 mol / L added is 40 ml.

[0032] Example 1 A method for preparing potassium permanganate alumina sphere air purification filter media includes the following steps: S1. Place the activated alumina balls in deionized water and ultrasonically clean for 20 min, then dry at 110℃ for 3 h to obtain pretreated alumina balls; S2. Dissolve potassium permanganate in deionized water, add a stabilizer, the amount of stabilizer added is 1% of the mass of potassium permanganate, and prepare a potassium permanganate solution with a mass concentration of 10%. S3. Place the pretreated alumina balls obtained in step S1 into a vacuum impregnation device, evacuate to -0.09MPa, maintain for 15min, then add the potassium permanganate solution obtained in step S2 to completely immerse the alumina balls, maintain the vacuum level, impregnate for 2h, and obtain the impregnated alumina balls. S4. Take out the impregnated alumina balls obtained in step S3, drain off the excess solution on the surface, place them in a microwave drying device, and dry them at 70°C for 1.5 hours to obtain dried alumina balls. S5. Soak the dried alumina balls from step S4 in a 1.5wt% citric acid solution for 20 minutes, then rinse them with deionized water and dry them at 60°C for 45 minutes to obtain the treated alumina balls. S6. Place the treated alumina balls obtained in step S5 in a sealed container and age them at 25°C for 18 hours to obtain potassium permanganate alumina ball air purification filter media.

[0033] The stabilizer is a composition of sodium silicate and modified β-cyclodextrin-1, with a mass ratio of sodium silicate to modified β-cyclodextrin of 1:7.

[0034] Example 2 A method for preparing potassium permanganate alumina sphere air purification filter media includes the following steps: S1. Place the activated alumina balls in deionized water and ultrasonically clean for 10 min, then dry at 100℃ for 4 h to obtain pretreated alumina balls; S2. Dissolve potassium permanganate in deionized water, add a stabilizer, the amount of stabilizer added is 0.5% of the mass of potassium permanganate, and prepare a potassium permanganate solution with a mass concentration of 10%. S3. Place the pretreated alumina balls obtained in step S1 into a vacuum impregnation device, evacuate to -0.08MPa, maintain for 20min, then add the potassium permanganate solution obtained in step S2 to completely immerse the alumina balls, maintain the vacuum level, impregnate for 1h, and obtain the impregnated alumina balls. S4. Take out the impregnated alumina balls obtained in step S3, drain off the excess solution on the surface, place them in a microwave drying device, and dry them at 50°C for 2 hours to obtain dried alumina balls. S5. Soak the dried alumina balls from step S4 in a 0.5 wt% citric acid solution for 30 min, then rinse them with deionized water and dry them at 50°C for 60 min to obtain the treated alumina balls. S6. Place the treated alumina balls obtained in step S5 in a sealed container and age them at 20°C for 24 hours to obtain potassium permanganate alumina ball air purification filter media.

[0035] The stabilizer is a composition of sodium silicate and modified β-cyclodextrin-1, with a mass ratio of sodium silicate to modified β-cyclodextrin of 1:5.

[0036] Example 3 A method for preparing potassium permanganate alumina sphere air purification filter media includes the following steps: S1. Place the activated alumina balls in deionized water and ultrasonically clean for 10 min, then dry at 120℃ for 2 h to obtain pretreated alumina balls; S2. Dissolve potassium permanganate in deionized water, add a stabilizer at 2% of the mass of potassium permanganate, and prepare a potassium permanganate solution with a mass concentration of 10%. S3. Place the pretreated alumina balls obtained in step S1 into a vacuum impregnation device, evacuate to -0.1MPa, maintain for 10 minutes, then add the potassium permanganate solution obtained in step S2 to completely immerse the alumina balls, maintain the vacuum level, impregnate for 3 hours, and obtain the impregnated alumina balls. S4. Take out the impregnated alumina balls obtained in step S3, drain off the excess solution on the surface, place them in a microwave drying device, and dry them at 80°C for 1 hour to obtain dried alumina balls. S5. Soak the dried alumina balls from step S4 in a 2wt% citric acid solution for 10 minutes, then rinse them with deionized water and dry them at 70°C for 30 minutes to obtain the treated alumina balls. S6. Place the treated alumina balls obtained in step S5 into a sealed container and age them at 30°C for 12 hours to obtain potassium permanganate alumina ball air purification filter media.

[0037] The stabilizer is a composition of sodium silicate and modified β-cyclodextrin-1, with a mass ratio of sodium silicate to modified β-cyclodextrin of 1:10.

[0038] Example 4 A method for preparing potassium permanganate alumina sphere air purification filter material, the specific implementation method is the same as in Example 1, the difference being that modified β-cyclodextrin-1 is replaced by modified β-cyclodextrin-2 in equal amounts.

[0039] Example 5 A method for preparing potassium permanganate alumina sphere air purification filter material, the specific implementation method is the same as in Example 1, the difference being that the stabilizer is a combination of sodium silicate and β-cyclodextrin, and the mass ratio of sodium silicate to β-cyclodextrin is 1:7.

[0040] Example 6 A method for preparing potassium permanganate alumina sphere air purification filter material, the specific implementation method is the same as in Example 1, the difference being that the stabilizer is sodium silicate.

[0041] Comparative Example 1 A method for preparing potassium permanganate alumina sphere air purification filter media includes the following steps: S1. Place the activated alumina balls in deionized water and ultrasonically clean for 20 min, then dry at 110℃ for 3 h to obtain pretreated alumina balls; S2. Dissolve potassium permanganate in deionized water to prepare a 10% potassium permanganate solution. S3. Place the pretreated alumina balls obtained in step S1 into a vacuum impregnation device, evacuate to -0.09MPa, maintain for 15min, then add the potassium permanganate solution obtained in step S2 to completely immerse the alumina balls, maintain the vacuum level, impregnate for 2h, and obtain the impregnated alumina balls. S4. Take out the impregnated alumina balls obtained in step S3, drain off the excess solution on the surface, place them in a microwave drying device, and dry them at 70°C for 1.5 hours to obtain dried alumina balls. S5. Soak the dried alumina balls from step S4 in a 1.5wt% citric acid solution for 20 minutes, then rinse them with deionized water and dry them at 60°C for 45 minutes to obtain the treated alumina balls. S6. Place the treated alumina balls obtained in step S5 in a sealed container and age them at 25°C for 18 hours to obtain potassium permanganate alumina ball air purification filter media.

[0042] Performance testing The potassium permanganate alumina sphere air purification filter media obtained in the above embodiments were tested: Purification test: using sulfur dioxide containing 8000 mg / Nm³ 3 An airflow with a relative humidity of 60% and a formaldehyde content of 4000 mg / Nm³ 3 A preliminary purification test was conducted on potassium permanganate alumina balls prepared in the above embodiments and comparative examples using an airflow with a relative humidity of 60%. The test temperature was 25°C, the filling volume was 600 ml, and the inlet airflow space velocity was controlled at 5000 h⁻¹ during the purification of sulfur dioxide. -1 The outlet gas is tested every 5 minutes; the inlet air velocity is controlled at 2000 h⁻¹ during formaldehyde purification. -1 The outlet gas should be tested every 20 minutes; the sulfur dioxide or formaldehyde content in the outlet gas should be ≥30 mg / Nm³. 3 Stop the test and record the purification capacity (in wt%, based on the dry weight of the potassium permanganate alumina balls).

[0043] Purification capacity = (Total mass of adsorbed pollutants / Dry weight of packed potassium permanganate alumina balls) × 100% The test results are shown in Table 1: Table 1 As shown in Table 1, the air purification filter media in Examples 1-3 of this invention have high purification efficiency, indicating that the potassium permanganate loading on the air purification filter media is high, uniform, firmly bonded, and has good stability. A comparison between Example 4 and Example 1 shows that changing the ratio of β-cyclodextrin and cerium nitrate solution may cause a large number of residual rare earth metal ions in the system to undergo redox reactions with potassium permanganate, leading to a decrease in the purification efficiency of the air purification filter media. A comparison between Example 5 and Example 1 shows that using unmodified β-cyclodextrin and sodium silicate as a stabilizer directly when preparing the potassium permanganate solution results in lower purification efficiency for the air purification filter media. A comparison between Example 6 and Example 1 shows that using only sodium silicate as a stabilizer when preparing the potassium permanganate solution further reduces the purification efficiency of the air purification filter media. A comparison between Comparative Example 1 and Example 1 shows that the purification efficiency of the air purification filter media without adding a stabilizer when preparing the potassium permanganate solution is poor.

[0044] The above embodiments are only for illustrating the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand the content of the present invention and implement it. They should not be used to limit the scope of protection of the present invention. All equivalent changes or modifications made in accordance with the spirit and essence of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A method for preparing potassium permanganate alumina sphere air purification filter media, characterized in that, Includes the following steps: S1. Place the activated alumina balls in deionized water and ultrasonically clean for 10-30 minutes, then dry them at 100-120℃ for 2-4 hours to obtain pretreated alumina balls. S2. Dissolve potassium permanganate in deionized water, add stabilizer, and prepare a potassium permanganate solution with a mass concentration of 5%-15%. S3. Place the pretreated alumina balls obtained in step S1 into a vacuum impregnation device, evacuate to -0.08~-0.1MPa, maintain for 10-20min, then add the potassium permanganate solution obtained in step S2, so that the solution completely immerses the alumina balls, maintain the vacuum degree, impregnate for 1-3h, and obtain the impregnated alumina balls. S4. Take out the impregnated alumina balls obtained in step S3, drain off the excess solution on the surface, place them in a microwave drying device, and dry them at 60-80℃ for 1-2 hours to obtain dried alumina balls. S5. Soak the dried alumina balls from step S4 in an organic acid solution with a concentration of 0.5-2wt% for 10-30 minutes. After removing them, rinse them with deionized water and then dry them at 50-70℃ for 30-60 minutes to obtain the treated alumina balls. S6. Place the treated alumina balls obtained in step S5 in a sealed container and age them at 20-30℃ for 12-24 hours to obtain the potassium permanganate alumina ball air purification filter material.

2. The method for preparing potassium permanganate alumina sphere air purification filter media according to claim 1, characterized in that, The stabilizer is a combination of sodium silicate and modified β-cyclodextrin.

3. The method for preparing potassium permanganate alumina sphere air purification filter media according to claim 1, characterized in that, The amount of stabilizer added is 0.5%-2% of the mass of potassium permanganate.

4. The method for preparing potassium permanganate alumina sphere air purification filter media according to claim 2, characterized in that, The method for preparing the modified β-cyclodextrin includes the following steps: A1. Add β-cyclodextrin to sodium hydroxide solution and stir at 50-60℃ for 1-2 hours to obtain cyclodextrin activated solution; A2. Slowly add rare earth salt solution to the cyclodextrin activation solution obtained in step A1, adjust the pH value to 5.5-7.0, and stir the reaction at a constant temperature of 40-70℃ for 2-4 hours. After the reaction is completed, wash with deionized water 2-3 times, and then vacuum dry at 40-50℃ to constant weight to obtain modified β-cyclodextrin.

5. The method for preparing potassium permanganate alumina sphere air purification filter media according to claim 4, characterized in that, The concentration of the rare earth salt solution is 0.05-0.15 mol / L.

6. The method for preparing potassium permanganate alumina sphere air purification filter media according to claim 4, characterized in that, The rare earth salt solution is one or more of cerium nitrate solution, lanthanum nitrate solution, and cerium chloride solution.

7. The method for preparing potassium permanganate alumina sphere air purification filter media according to claim 4, characterized in that, The ratio of β-cyclodextrin to rare earth salt solution is 1g:(10-30)ml.

8. The method for preparing potassium permanganate alumina sphere air purification filter media according to claim 1, characterized in that, The organic acid solution is selected from one or more of citric acid solution, tartaric acid solution, or ascorbic acid solution.

9. The application of potassium permanganate alumina sphere air purification filter media obtained by the preparation method according to any one of claims 1-8 in air purification.

10. The application according to claim 9, characterized in that, The air purification includes removing at least one of hydrogen sulfide, sulfur dioxide, formaldehyde, and volatile organic compounds from the air.

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