Air purification material with formaldehyde removal, antibiosis and deodorization functions and preparation method thereof

Abstract

The invention discloses an air purification material with formaldehyde removal, antibiosis and deodorization functions and a preparation method of the air purification material. The method comprises the following steps: preparing a base material: crushing one or more of aluminum oxide, silicon dioxide, zeolite, montmorillonite and sepiolite inorganic porous materials into powder; fully stirring with calcium superphosphate powder, adding an adhesive, and sintering to prepare a granular base material; preparing a chlorine dioxide activation-free solution; and soaking the sintered particle base material in a chlorine dioxide activation-free solution, carrying out ultrasonic dispersion, and drying the particles subjected to ultrasonic dispersion in a drying box to prepare the air purification material with formaldehyde removal, antibacterial and deodorization functions. The material has three functions of formaldehyde removal, antibiosis and deodorization at the same time, has good mechanical properties, guarantees good processability, and can specifically solve the problems that an existing air purification material adsorbs peculiar smells and toxic gases in a manner of treating both symptoms and root causes, and is weak in sterilization capability.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of air purification material preparation, and particularly relates to an air purification material with aldehyde removal, antibacterial and deodorization functions and a preparation method thereof. BACKGROUND

[0002] In recent years, the prevalence rate of chronic respiratory diseases in China shows a trend of increasing year by year. Pathogenic microorganisms are transmitted in the air through three ways of droplets, droplet nuclei and dust, and the impact is more significant in densely populated places. At the same time, formaldehyde, benzene, volatile organic compounds and other substances released by unqualified decorative materials are continuously inhaled by the human body, which leads to many chronic diseases. Therefore, indoor air quality improvement is crucial to improve the health of residents.

[0003] In 2013, Chinese residents began to pay attention to respiratory health, and the air purifier industry also experienced an explosive growth. The main working principle of the mainstream air purifiers on the market is: the filter type intercepts particulate matter through different pore size filter screens, the primary filter screen is responsible for large particles, and the HEPA filter screen captures small dust and bacteria, but the filter screen needs to be replaced regularly, otherwise the effect will be affected and bacteria will breed, and the purification capacity for gaseous pollutants is insufficient. The electrostatic dust collection type uses high-voltage electric field to adsorb charged particulate matter, but it produces ozone, and the electrode also needs to be cleaned regularly, and the adsorption effect of small particle size particles is not ideal. The activated carbon adsorption type relies on pores to adsorb gaseous pollutants, but the adsorption capacity is limited, and there is a risk of secondary pollution after saturation, and it cannot handle solid pollutants. The photocatalytic oxidation type uses photocatalysts to decompose pollutants, but the reaction is slow, the purification capacity for high-concentration pollutants is weak, and ultraviolet rays have potential hazards. The negative ion type makes particulate matter settle, and the purification range is limited, and the settled matter can be easily raised again if not cleaned. Overall, the above air purification technologies have their advantages in sterilization, physical adsorption and filtration, but still have obvious limitations.

[0004] Chlorine dioxide is a high-efficiency, broad-spectrum, safe, fast and green disinfectant. It is identified as an A1 disinfectant because it has no three-reaction (carcinogenic, teratogenic, and genetic mutation), and it is the only one to obtain this certification among all disinfectants. Chlorine dioxide has oxidizing properties and is a highly effective disinfectant that can kill all pathogenic microorganisms without developing drug resistance. It has a high and fast killing effect on various coronaviruses, baculoviruses, fungi and spores. Currently, most of the chlorine dioxide stable liquids used are products that need to be activated, which have problems such as uncontrollable release rate, need to be prepared on site before use, and the use of toxic stabilizers such as pyridine. SUMMARY

[0005] The main purpose of the present application is to provide an air purification material with the functions of removing aldehyde, antibacterial and deodorization and a preparation method thereof, aiming to solve the problems of the existing air purification materials, such as the adsorption of odors and toxic gases by 'treating the symptoms not the disease' and weak bactericidal ability.

[0006] To achieve the above-mentioned purpose, the present application provides a preparation method of an air purification material with the functions of removing aldehyde, antibacterial and deodorization, which comprises the following steps: Step S10, preparing a substrate: one or more of alumina, silica, zeolite, montmorillonite and sepiolite inorganic porous materials are crushed into powder, and the powder is fully stirred with superphosphate powder, then a binder is added and sintered to prepare a granular substrate; Step S20, preparing a chlorine dioxide non-activated solution; Step S30, soaking the sintered granular substrate into the chlorine dioxide non-activated solution, performing ultrasonic dispersion, and drying the ultrasonically dispersed granules in a drying oven to obtain the air purification material with the functions of removing aldehyde, antibacterial and deodorization.

[0007] The further technical solution of the present application is that the step S10 comprises: Step S101, one or more of alumina, silica, zeolite, montmorillonite and sepiolite inorganic porous materials are crushed into powder, and the powder is fully stirred with superphosphate powder at a weight ratio of 10:1 to 7:1; Step S102, adding a binder and water to the powder obtained in step S101 to form a slurry, and performing ultrasonic dispersion, wherein the obtained solid accounts for 20-30% of the total volume of the slurry, the ultrasonic time is 30-60 minutes, the slurry is homogenized into a suspension, and the binder is one or more of sodium silicate, phosphate or chlorate; Step S103, the homogenized suspension is granulated by a spray granulation device, wherein the feeding speed is 5-20 milliliters per second, and the compressed air atomization is 0.8-1 megapascal to form microdroplets; Step S104, the microdroplets form spherical shape under the action of surface tension, and the water in the microdroplets is rapidly evaporated by hot air at 200-270 DEG C to form spherical particles; Step S105, the atomized spherical particles are calcined at a temperature of 500-650 DEG C for 4-12 hours, so that the oxide powders in the interior are sintered together, thereby improving the mechanical properties and solvent resistance of the particles.

[0008] The further technical solution of the present application is that the step S20 comprises: Step S201, sodium chlorite solution and hydrochloric acid solution are added into a reaction container, and a reaction is carried out under the condition of heating and stirring, to generate a mixed gas of chlorine dioxide and chlorine, wherein the concentration of the sodium chlorite solution is 23-31%wt, the concentration of the hydrochloric acid is 20-35%wt, and the heating temperature is 60-90℃; Step S202, the mixed gas obtained in step S201 is passed through a ferric dichloride solution to remove chlorine in the mixed gas, wherein the concentration of the ferric dichloride solution is 30-50%wt; Step S203, the gas obtained in step S202 is passed into pure water, and a complexing agent and a stabilizer are added, and after stirring, a chlorine dioxide non-activated solution is obtained, wherein the complexing agent is one or more of sodium ethylenediaminetetraacetate, sodium citrate and sodium hexametaphosphate; and the stabilizer is one or more of polyvinyl alcohol PLA, carboxymethyl cellulose CMC and polyacrylic acid PAA.

[0009] The further technical solution of the present application is that in step S203, When the stabilizer is polyvinyl alcohol PLA, the concentration of the polyvinyl alcohol PLA is 3-5%wt, and the degree of polymerization is 30-50; When the stabilizer is carboxymethyl cellulose CMC, the concentration of the carboxymethyl cellulose CMC is 2-5%wt, and the degree of polymerization is 30-90; When the stabilizer is polyacrylic acid PAA, the concentration of the polyacrylic acid PAA is 2.5-6.5%wt, and the degree of polymerization is 30-50.

[0010] The further technical solution of the present application is that in step S203, When the complexing agent is sodium ethylenediaminetetraacetate, the concentration of the sodium ethylenediaminetetraacetate is 0.2-3.0%wt; When the complexing agent is sodium citrate, the concentration of the sodium citrate is 0.5-3.0%wt; When the complexing agent is sodium hexametaphosphate, the concentration of the sodium hexametaphosphate is 0.2-2.0%wt.

[0011] The further technical solution of the present application is that the ferric dichloride solution is added with iron blocks and hydrochloric acid as regenerants.

[0012] The further technical solution of the present application is that step S30 comprises: Step S301, the sintered granular substrate is soaked into the chlorine dioxide non-activated solution, and ultrasonic dispersion is carried out, so that the granules and the liquid are fully contacted and infiltrated, wherein the ultrasonic time is usually 30-60 minutes; Step S302, the particles after ultrasonic are put into a drying oven for drying, the drying temperature is 50-65 DEG C, the drying time is 4-6 hours, and the air purification material with the functions of removing aldehyde, sterilization and deodorization is prepared after drying.

[0013] To achieve the above object, the application further provides an air purification material with the functions of removing aldehyde, sterilization and deodorization, which is prepared by the method.

[0014] The prepared particles are a kind of green, non-toxic and environment-friendly porous composite material, the combined use of the effective components of the particles has the three functions of removing aldehyde, sterilization and deodorization, and the particles have good mechanical properties to ensure good processability, and have good market prospects in the production of filter screens of air purification equipment and the development of household odor removal and aldehyde removal products.

[0015] The prepared air purification material has a porous structure, can adsorb toxic and odor gases such as formaldehyde, ammonia, hydrogen sulfide and the like in the indoor environment to the surface of the particles, and can neutralize odor substances by the reaction of the calcium superphosphate component in the particles and the slow release of trace amounts of chlorine dioxide gas with ammonia, formaldehyde, hydrogen sulfide and the like, so as to eliminate the influence of odor from the source, and oxidize and decompose formaldehyde, hydrogen sulfide and the like into non-toxic and harmless substances. The chlorine dioxide gas dispersed in the air also has broad-spectrum sterilization capacity to ensure the safety of the crowd. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained from the structures shown in the drawings without creative labor.

[0017] Figure 1 It is the overall flowchart of the preparation method of the air purification material with the functions of removing aldehyde, sterilization and deodorization.

[0018] The implementation, functional characteristics and advantages of the present application will be further described with reference to the embodiments and the accompanying drawings. DETAILED DESCRIPTION

[0019] With reference to the drawings of the embodiments of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments of the present application, all the other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0020] To solve the problems of the existing air purification materials, such as the adsorption of odors and toxic gases by "treating the symptoms not the root cause", and the weak bactericidal ability, the present application provides a preparation method of an air purification material with de-aldehyde, antibacterial and deodorization functions. In the process of preparing the air purification material with de-aldehyde, antibacterial and deodorization functions, the base material of the particles is inorganic porous material such as alumina, silicon dioxide, zeolite, montmorillonite and sepiolite, which is mixed with superphosphoric acid calcium after crushing and mixing with a certain proportion of adhesive, and then sintered into particle balls, and then immersed in a chlorine dioxide non-activated stable solution and dried. The porous material can effectively adsorb toxic and odor gases such as formaldehyde, ammonia and hydrogen sulfide in the air, and oxidize on the surface to convert them into odorless and harmless substances. The particles after soaking also have a certain chlorine dioxide gas slow-release capacity, which can effectively kill bacteria, fungi and other pathogens and viruses in the air, and reduce the risk of transmission of infectious diseases such as influenza.

[0021] Specifically, the preparation method of the air purification material with de-aldehyde, antibacterial and deodorization functions mainly includes the following steps: Step S10, preparing a base material: one or more of alumina, silicon dioxide, zeolite, montmorillonite and sepiolite inorganic porous material is crushed into powder, and then mixed with superphosphoric acid calcium powder after fully stirring, and then sintered with an adhesive to prepare a particle base material; Step S20, preparing a chlorine dioxide non-activated solution; Step S30, soaking the sintered particle base material into the chlorine dioxide non-activated solution, ultrasonic dispersion, drying the ultrasonic dispersed particles in a drying oven, and preparing the air purification material with de-aldehyde, antibacterial and deodorization functions.

[0022] The step S10 includes: Step S101, one or more of alumina, silicon dioxide, zeolite, montmorillonite and sepiolite inorganic porous material is crushed into powder, and then mixed with superphosphoric acid calcium powder according to a weight ratio of 10:1-7:1 after fully stirring; Step S102, adding a binder to the powder obtained in step S101 to form a slurry with water, and performing ultrasonic dispersion, wherein the obtained solid content is 20-30% of the total volume of the slurry, the ultrasonic time is 30-60 minutes, the slurry is homogenized into a suspension, and the binder is one or more of sodium silicate, phosphate or chlorate; Step S103, homogenizing the suspension with a spray granulation device, wherein the feeding speed is 5-20 ml / s, and the compressed air pressure is 0.8-1 MPa to form microdroplets; Step S104, forming spherical particles by rapidly evaporating the water in the microdroplets under the action of surface tension and through hot air at 200-270°C; Step S105, calcining the atomized spherical particles at a temperature of 500-650°C for 4-12 hours to sinter the internal oxide powder together, thereby improving the mechanical properties and solvent resistance of the particles.

[0023] The step S20 comprises: Step S201, adding a sodium chlorite solution and a hydrochloric acid solution to a reaction container, and performing a reaction under heating and stirring conditions to generate a mixed gas of chlorine dioxide and chlorine, wherein the concentration of the sodium chlorite solution is 23-31%wt, the concentration of the hydrochloric acid is 20-35%wt, and the heating temperature is 60-90°C; Step S202, passing the mixed gas obtained in step S201 through a ferric dichloride solution to remove chlorine from the mixed gas, wherein the concentration of the ferric dichloride solution is 30-50%wt; and the ferric dichloride solution is added with iron blocks and hydrochloric acid as regenerants.

[0024] Step S203, passing the gas obtained in step S202 into pure water, and adding a complexing agent and a stabilizer, and stirring to obtain a chlorine dioxide activation-free solution, wherein the complexing agent is one or more of sodium ethylenediaminetetraacetate, sodium citrate and sodium hexametaphosphate; and the stabilizer is one or more of polyvinyl alcohol PLA, carboxymethyl cellulose CMC and polyacrylic acid PAA.

[0025] In step S203, when the stabilizer is polyvinyl alcohol PLA, the concentration of the polyvinyl alcohol PLA is 3-5%wt, and the degree of polymerization is 30-50; When the stabilizer is carboxymethyl cellulose CMC, the concentration of the carboxymethyl cellulose CMC is 2-5%wt, and the degree of polymerization is 30-90; When the stabilizer is polyacrylic acid PAA, the concentration of the polyacrylic acid PAA is 2.5-6.5%wt, and the degree of polymerization is 30-50.

[0026] The concentration of the complexing agent is 0.2-3.0%wt when the complexing agent is sodium ethylenediaminetetraacetate; The concentration of the complexing agent is 0.5-3.0%wt when the complexing agent is sodium citrate. The concentration of the complexing agent is 0.2-2.0%wt when the complexing agent is sodium hexametaphosphate.

[0027] The step S30 comprises: Step S301, the sintered granular substrate is immersed into the chlorine dioxide non-activation solution, and ultrasonic dispersion is performed to make the granules fully contact and infiltrate with the liquid, wherein the ultrasonic time is usually 30-60 minutes. Step S302, the granules after ultrasonic treatment are placed into a drying oven for drying, the drying temperature is 50-65℃, and the drying time is 4-6 hours, and the air purification material with the functions of aldehyde removal, sterilization and deodorization is prepared after drying.

[0028] The preparation method of the air purification material with the functions of aldehyde removal, sterilization and deodorization is further described below.

[0029] Preparation Example Preparation Example 1 Preparation Example 1 provides a substrate manufacturing method of an air purification material, comprising the following steps: (1) The alumina is crushed into powder, and the calcium superphosphate powder is fully stirred according to a weight ratio of 10:1.

[0030] (2) Sodium silicate salt and water are added to the powder obtained in step (1) to form a slurry, so that the concentration of sodium silicate salt is 15%, and ultrasonic dispersion is performed. The solid content accounts for 20-30% of the total volume of the slurry, and the ultrasonic time is 60 minutes, so that the slurry is homogenized into a suspension.

[0031] (3) The homogenized suspension is granulated by a spray granulation device. The feeding speed is 5 milliliters per second, the microdroplets are formed by 1 megapascal compressed air atomization, and the spherical particles are formed by hot air at 200-270℃.

[0032] (4) The spherical particles after atomization are calcined at a temperature of 500-650℃ for 4-12 hours to obtain the substrate of the air purification material.

[0033] Preparation Example 2 Preparation Example 2 is different from Preparation Example 1 in that the alumina is replaced by silica, and the remaining steps are consistent with Preparation Example 1.

[0034] Preparation Example 3 Preparation Example 3 differs from Preparation Example 1 in that the mixing ratio of alumina to superphosphate is increased from 10:1 to 8:1; the remaining steps are consistent with Preparation Example 1.

[0035] Preparation Example 4 Preparation Example 4 differs from Preparation Example 1 in that the alumina is replaced with silica, and the mixing ratio of silica to superphosphate is increased from 10:1 to 8:1; the remaining steps are consistent with Preparation Example 1. Example Example 1

[0036] Example 1 provides a granule preparation processing method with bactericidal and deodorizing functions, comprising the following steps: (1) First, sodium chlorite solution and hydrochloric acid solution are added to a reaction container, and the reaction is carried out under heating and stirring conditions to generate a mixed gas of chlorine dioxide and chlorine; the concentration of sodium chlorite solution in the obtained solution is 23%wt, and the concentration of hydrochloric acid is 20%wt, and the reaction is carried out at 60°C for 30 minutes.

[0037] (2) Then, the generated mixed gas of chlorine dioxide and chlorine is slowly introduced into a 50%wt ferrous dichloride solution, and the chlorine in the mixed gas is removed. If necessary, iron blocks and hydrochloric acid can be added to the ferrous dichloride solution as a regenerating agent.

[0038] (3) Finally, the obtained gas is introduced into pure water, and polyvinyl alcohol PLA and sodium hexametaphosphate are added, and after stirring, a chlorine dioxide non-activated solution is obtained, the concentration of polyvinyl alcohol PLA in the obtained solution is 3%wt, the degree of polymerization is 30-50, and the concentration of sodium hexametaphosphate is 0.5%wt.

[0039] (4) The sintered Preparation Example 1 granules are subjected to ultrasonic dispersion by being immersed in the chlorine dioxide non-activated solution, and the ultrasonic time is 30 minutes.

[0040] (5) The granules after ultrasonic immersion are placed in a drying oven at 60°C for 4 hours of drying, and the finished material is obtained after drying. Example 2

[0041] Example 2 differs from Example 1 in that the granules of Preparation Example 2 are used in the immersion process, and the remaining steps are consistent with Example 1. Example 3

[0042] Example 3 differs from Example 1 in that the granules of Preparation Example 3 are used in the immersion process, and the concentration of sodium chlorite solution in the chlorine dioxide non-activated solution used for immersion is 31%wt, and the concentration of hydrochloric acid is 30%wt, and the remaining steps are consistent with Example 1. Example 4

[0043] Example 4 differs from Example 1 in that the granules of Preparation Example 4 are used in the process of soaking, the concentration of sodium chlorite solution in the chlorine dioxide free activated solution used for soaking is 31%wt, the concentration of hydrochloric acid is 30%wt, and the remaining steps are consistent with Example 1.

[0044] Comparative Example The comparative example is a granule sintered from pure alumina powder (without calcium superphosphate) without soaking treatment.

[0045] Bactericidal performance test: The antibacterial performance of the granules in each example and comparative example was tested according to the detection method of "Disinfection Technical Specification 2002 Edition-2.1.3". The specific detection method was as follows: the bacteria solution was sprayed in a 1m³ aerosol box, each example and comparative example was hung in the middle of different aerosol boxes, and after 24 hours of action, the aerosol box was sampled, and the collected culture dishes were placed in a 37.0℃ incubator for 48 hours of incubation, and then the viable bacteria count was performed to obtain the results. The higher the inhibition rate, the better the antibacterial performance of the material.

[0046] Table 1 Bactericidal performance test results of air purification materials Sample Bacteriostatic rate (%) Comparative Example 15.53 Example 1 96.98 Example 2 95.63 Example 3 99.29 Example 4 99.16 According to the test results, the antibacterial performance of Example 3 is the best. It can be seen that increasing the concentration of hydrochloric acid and sodium chlorite solution in Preparation Example 3 can increase the content of disinfecting components in the material, thereby improving its bactericidal ability.

[0047] Compared with Examples 3 and 4, the antibacterial performance of Examples 1 and 2 is weaker, but it is still significantly improved compared with the comparative example. It can be seen that the antibacterial performance of the material soaked in the chlorine dioxide free activated solution is obviously enhanced.

[0048] Gas purification performance test: The gas purification performance of each example and comparative example was tested according to the detection method of "QB / T 2761-2006 Indoor Air Purification Product Purification Effect Determination Method". The specific detection method was as follows: the corresponding pollutant source was placed in a 1m³ experimental chamber, each example and comparative example was hung in the middle of different experimental chambers, the fan was started to stir for 1 minute, and the experimental chamber of the comparative example was sampled to determine the initial concentration of the pollutant. After 24 hours of action, the experimental chambers of the examples and comparative example were sampled again to obtain the concentration of the pollutant. The lower the concentration of the pollutant, the better the air purification performance of the material.

[0049] Table 2 Gas purification performance test results of air purification materials Sample Ammonia removal rate (%) Hydrogen sulfide removal rate (%) Formaldehyde removal rate (%) Comparative Example 7.2 5.4 10.2 Example 1 92.6 80.5 93.5 Example 2 93.2 83.2 94.2 Example 3 97.3 91.0 98.6 Example 4 95.2 88.5 97.5 According to the detection results, the gas purification performance of Example 3 is the best, which shows that the free acid contained in the added superphosphoric acid in Preparation Example 3 can be adsorbed with ammonia gas, and the particles can oxidize hydrogen sulfide, formaldehyde and other gases after being soaked in the chlorine dioxide non-activated solution, and through the strong oxidizing property of chlorine dioxide, the gases are decomposed into non-toxic and odorless substances such as water and chlorine dioxide, thereby effectively removing the odor.

[0050] Compared with Examples 3 and 4, the gas purification performance of Examples 1 and 2 is weaker, but it is still significantly improved compared with the comparative examples, which shows that the air purification material after adding superphosphoric acid and soaking in chlorine dioxide non-activated solution has targeted removal ability for ammonia gas, hydrogen sulfide and other gases.

[0051] The prepared air purification material particles are green, non-toxic and environmentally friendly porous composite materials, which have good mechanical properties and processability. The combined use of the effective components makes it have three functions of aldehyde removal, antibacterial and deodorization, which has good market prospects in the production of air purification equipment filter screen, the development of household odor removal and formaldehyde removal products, etc. The porous structure of the material particles can adsorb indoor toxic and odor gases such as formaldehyde, ammonia gas and hydrogen sulfide to the surface, and the superphosphoric acid component and the slow-release trace amount of chlorine dioxide gas can react with ammonia gas, formaldehyde, hydrogen sulfide and other gases respectively, neutralize odor substances, eliminate odor from the source, oxidize and decompose formaldehyde, hydrogen sulfide and other gases into non-toxic and harmless substances; at the same time, the chlorine dioxide gas dispersed in the air has broad-spectrum bactericidal ability, which can ensure the safety of the crowd. In order to achieve the above purpose, the present application also proposes an air purification material with the functions of aldehyde removal, antibacterial and deodorization, which is prepared by the method as described above, which is not repeated here.

[0052] The above only describes the preferred embodiments of the present application, and does not limit the patent scope of the present application, and any equivalent structural transformation made according to the concept of the present application, or direct / indirect application in other related technical fields is included in the patent protection scope of the present application.

Claims

1. A method for preparing an air purification material with formaldehyde removal, antibacterial, and deodorizing functions, characterized in that, The method includes the following steps: Step S10, preparing the substrate: one or more of the inorganic porous materials such as alumina, silica, zeolite, montmorillonite, and sepiolite are pulverized into powder, and after being thoroughly mixed with superphosphate powder, a binder is added and sintered to form a granular substrate. Step S20: Prepare chlorine dioxide activation-free solution; Step S30: Immerse the sintered granular substrate in a chlorine dioxide activation-free solution and perform ultrasonic dispersion. Place the ultrasonically dispersed particles in a drying oven for drying to obtain an air purification material with formaldehyde removal, antibacterial and deodorizing functions.

2. The method for preparing the air purification material with formaldehyde removal, antibacterial and deodorizing functions according to claim 1, characterized in that, Step S10 includes: Step S101: Crush one or more of the inorganic porous materials such as alumina, silica, zeolite, montmorillonite, and sepiolite into powder, and mix them thoroughly with superphosphate powder at a weight ratio of 10:1 to 7:

1. Step S102: Add binder and water to the powder obtained in step S101 to form a slurry, and then perform ultrasonic dispersion. The obtained solids account for 20-30% of the total volume of the slurry, and the ultrasonic time is 30-60 minutes to homogenize the slurry into a suspension. The binder is one or more of sodium silicate, phosphate or chlorate. Step S103: The homogenized suspension is granulated using a spray granulation device, wherein the suspension is atomized into microdroplets by compressed air at a feed rate of 5 ml to 20 ml per second and a pressure of 0.8 MPa to 1 MPa. In step S104, the microdroplets form spheres under the action of surface tension, and after passing through hot air at 200-270°C, the water in the microdroplets evaporates rapidly, forming spherical particles. In step S105, the atomized spherical particles are calcined at 500-650℃ for 4-12 hours to sinter the internal oxide powder together, thereby improving the mechanical properties and solvent resistance of the particles.

3. The method for preparing the air purification material with formaldehyde removal, antibacterial, and deodorizing functions according to claim 2, characterized in that, Step S20 includes: Step S201: Sodium chlorite solution and hydrochloric acid solution are added to a reaction vessel and reacted under heating and stirring conditions to generate a mixed gas of chlorine dioxide and chlorine gas. The concentration of sodium chlorite solution is 23-31%wt, the concentration of hydrochloric acid is 20-35%wt, and the heating temperature is 60-90℃. Step S202: The mixed gas obtained in step S201 is passed through a ferric chloride solution to remove chlorine from the mixed gas, wherein the concentration of the ferric chloride solution is 30-50%wt. Step S203: The gas obtained in step S202 is passed into pure water, and a complexing agent and a stabilizer are added. After mixing and stirring, a chlorine dioxide activation-free solution is obtained. The complexing agent is one or more of sodium ethylenediaminetetraacetate, sodium citrate, and sodium hexametaphosphate; the stabilizer is one or more of polyvinyl alcohol (PLA), carboxymethyl cellulose (CMC), and polyacrylic acid (PAA).

4. The method for preparing the air purification material with formaldehyde removal, antibacterial, and deodorizing functions according to claim 3, characterized in that, In step S203 When the stabilizer is polyvinyl alcohol (PLA), the concentration of PVA is 3-5%wt and the degree of polymerization is 30-50. When the stabilizer is carboxymethyl cellulose (CMC), the concentration of CMC is 2-5%wt, and the degree of polymerization is 30-90. When the stabilizer is polyacrylic acid (PAA), the concentration of PAA is 2.5-6.5%wt, and the degree of polymerization is 30-50.

5. The method for preparing the air purification material with formaldehyde removal, antibacterial and deodorizing functions according to claim 4, characterized in that, In step S203 When the complexing agent is sodium ethylenediaminetetraacetate, the concentration of sodium ethylenediaminetetraacetate is 0.2-3.0%wt; When the complexing agent is sodium citrate, the concentration of sodium citrate is 0.5-3.0%wt; When the complexing agent is sodium hexametaphosphate, the concentration of sodium hexametaphosphate is 0.2-2.0%wt.

6. The method for preparing the air purification material with formaldehyde removal, antibacterial, and deodorizing functions according to claim 3, characterized in that, The ferric chloride solution contains iron blocks and hydrochloric acid as regenerators.

7. The method for preparing the air purification material with formaldehyde removal, antibacterial, and deodorizing functions according to claim 1, characterized in that, Step S30 includes: Step S301: Immerse the sintered particulate substrate in a chlorine dioxide activation-free solution and perform ultrasonic dispersion to ensure that the particles are fully in contact with and wetted by the liquid. The ultrasonic time is usually 30-60 minutes. In step S302, the ultrasonically treated particles are placed in a drying oven for drying at a temperature of 50-65℃ for 4-6 hours. After drying, an air purification material with formaldehyde removal, sterilization, and deodorization functions is obtained.

8. An air purification material with formaldehyde removal, antibacterial, and deodorizing functions, characterized in that, The air purification material with formaldehyde removal, antibacterial and deodorizing functions is prepared by the method described in any one of claims 1 to 7.

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