Composite air purifying agent and preparation method and application thereof

Abstract

The application discloses a composite air purifying agent and a preparation method and application thereof, and belongs to the technical field of air purification. The purifying agent comprises silver ions, hydrogen peroxide, citric acid and a compound Chinese herbal medicine extract prepared from agastache, costus, syzygium aromaticum, folium artemisiae argyi, atractylodes, radix angelicae dahuricae, peppermint and pterocephalus. The active components of the Chinese herbal medicine are reserved through a normal-temperature ultrasonic extraction process, and are compounded with a silver ion catalyzed hydrogen peroxide system and a citric acid buffer stable system to realize synergistic effect. The product has an instant killing rate of 99.99% on pathogenic bacteria, influenza A virus H1N1 and human coronavirus 229E, and the long-acting bacteriostatic inactivation rate is maintained above 90% in 144 hours. The 24h formaldehyde degradation rate is 92.3%, and the 48h formaldehyde degradation rate is 98.1%. The removal rate of ammonia, hydrogen sulfide and trimethylamine is above 95%. The product is non-toxic and non-irritating, and the stability period is above 6 months. The application breaks through the limitation of single purification technology, has multiple functions of efficient sterilization and disinfection, long-acting protection, formaldehyde removal and deodorization, and fills the technical blank of long-acting and multifunctional air purification products for epidemic prevention.

Description

Technical Field

[0001] This invention relates to the field of air purification technology, specifically to a composite air purifier, its preparation method, and its application. Background Technology

[0002] With increasing public awareness of health and the widespread adoption of indoor decoration, indoor air pollution has become a growing concern. In enclosed spaces, in addition to formaldehyde, volatile harmful gases, and odorous pollutants, bacteria, mold, and airborne pathogens such as influenza viruses and coronaviruses are also prevalent. These pathogens can spread through aerosols and contact, posing a persistent health threat to residents, especially the elderly and children with weakened immune systems. Currently available air purification products mostly focus on single functions such as formaldehyde removal or odor elimination, generally lacking efficient and broad-spectrum pathogen inactivation capabilities, making it difficult to meet the growing daily epidemic prevention needs.

[0003] More importantly, existing air purification products with certain antibacterial or disinfection functions generally have a short protection period; most products can only achieve disinfection effects momentarily upon spraying or application, and cannot form continuous protection on object surfaces or within spaces; pathogenic microorganisms can regenerate and rebound shortly after disinfection, leading to the need for frequent repeated use, high usage costs, and a window of protection; for hospitals, campuses, public enclosed spaces, and daily family life, there is a lack of air purification products that can provide continuous antibacterial and antiviral capabilities for several days after a single use, which constitutes a significant pain point in the current industry.

[0004] Furthermore, existing purification products often enhance their immediate effectiveness by adding strong oxidizing chemicals or organic solvents, but this leads to problems such as poor component stability, easy decomposition and inactivation, skin and respiratory irritation, and secondary pollution. How to achieve multiple functions such as efficient pathogen inactivation, long-lasting protection, formaldehyde degradation, and air deodorization in the same product system, while ensuring that the product itself is non-toxic, non-irritating, and stable, is a technical challenge that urgently needs to be overcome in this field. Effectively combining inorganic antibacterial stabilizing systems with natural antibacterial and antiviral active ingredients to synergistically achieve the above-mentioned multiple functions has important research value. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide a composite air purifier, its preparation method and application.

[0006] To achieve the above objectives, the present invention provides the following technical solution: This application provides a composite air purifier containing silver ions, hydrogen peroxide, citric acid, and a compound herbal extract made from patchouli, costus root, clove, mugwort, atractylodes, angelica, peppermint, and eupatorium.

[0007] Preferably, the silver ion content is 50 to 200 ppm.

[0008] Preferably, the hydrogen peroxide accounts for 1% to 5% of the total weight of the purifying agent.

[0009] Preferably, the citric acid accounts for 0.1% to 0.5% of the total weight of the purifying agent.

[0010] Preferably, the compound herbal extract is obtained by mixing and extracting agastache, costus root, clove, mugwort, atractylodes, angelica, peppermint, and eupatorium in a mass ratio of 2:1:1:2:1.5:1.5:2:1.

[0011] Preferably, the pH value of the purifying agent is 4.5 to 5.5.

[0012] Preferably, the compound herbal extract is obtained by ultrasonic extraction of pulverized agastache, costus root, clove, mugwort, atractylodes, angelica, peppermint, and eupatorium at 15-35°C using an ethanol-water solution as a solvent.

[0013] A method for preparing the above-mentioned composite air purifier includes the following steps: Step S1: Mix and pulverize the following herbs: patchouli, costus root, clove, mugwort, atractylodes, angelica, peppermint, and eupatorium. Add an ethanol aqueous solution and perform ultrasonic-assisted extraction at 15-35℃. Separate the solid and liquid components to obtain the compound herbal extract. Step S2: Dissolve silver ion source, hydrogen peroxide and citric acid in water, add the compound herbal extract obtained in step S1, and adjust the pH of the system to 4.5-5.5 to obtain the compound air purifier.

[0014] Preferably, the power of the ultrasonic-assisted extraction in step S1 is 200-600W, and the extraction time is 30-90 minutes; the silver ion source is silver nitrate.

[0015] Based on the application of the aforementioned composite air purifier in the preparation of long-lasting indoor air prevention and purification products, the long-lasting prevention and purification products have 144-hour continuous antibacterial and antiviral capabilities, and can degrade formaldehyde and remove malodorous gases.

[0016] Compared with the prior art, this application has the following beneficial effects: The composite air purifier provided by this invention organically combines a long-lasting silver ion antibacterial system, a powerful hydrogen peroxide oxidation system, a citric acid buffer stabilizing system, and a specially formulated compound herbal natural antibacterial and antiviral extract. By utilizing the synergistic effect between the components, it achieves multiple core functions simultaneously in a single product for the first time, including highly efficient pathogenic microorganism inactivation, 144-hour long-lasting protection, highly efficient formaldehyde removal, and deodorization. Among them, silver ions not only have bactericidal effects themselves, but can also catalyze the decomposition of hydrogen peroxide to generate more active hydroxyl radicals, synergistically and significantly improving the immediate killing efficiency of bacteria and viruses. They also continue to play an antibacterial and inactivating role in the microenvironment formed after spraying, forming the basis for long-term protection. Citric acid stabilizes silver ions and hydrogen peroxide by precisely adjusting the pH value of the system, preventing their precipitation and rapid decomposition, ensuring the product's shelf-life stability of up to six months and long-lasting activity for 144 hours after spraying. The compound extract of eight Chinese herbal medicines is rich in volatile oils, flavonoids, alkaloids and other active ingredients. It not only has broad-spectrum antiviral and antibacterial efficacy, which can broaden the disinfection spectrum, but also provides a natural fragrance to neutralize odors and reduce the potential irritation of inorganic components, making the product more gentle and safe. This composite system breaks through the technical bottlenecks of traditional purification products, which are characterized by single-function, short-term, and easily rebounding effects. The resulting product exhibits an immediate kill rate of 99.99% against pathogenic bacteria such as Escherichia coli, Staphylococcus aureus, and Candida albicans, as well as viruses such as H1N1 influenza A virus and human coronavirus 229E. It also maintains a long-term antibacterial and inactivation rate of over 90% within 144 hours. The formaldehyde degradation rate reaches 92.3% in 24 hours and 98.1% in 48 hours. The removal rates of ammonia, hydrogen sulfide, and trimethylamine all exceed 95%. At the same time, the product is non-toxic, non-irritating, safe, and environmentally friendly, filling the market gap for long-lasting, multi-functional epidemic prevention air purification products. Attached Figure Description

[0017] Figure 1 This is a flowchart of a method for preparing a composite air purifier. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] Furthermore, in this invention, an element referred to as fixed to or disposed on another element may be directly disposed on the other element, or there may be an intermediate element. When an element is considered to be connected to another element, it may be directly connected to the other element, or there may be an intermediate element present simultaneously. The terms vertical, horizontal, left, right, and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0020] See Figure 1 This application provides a composite air purifier containing silver ions, hydrogen peroxide, citric acid, and a compound herbal extract made from patchouli, costus root, clove, mugwort, atractylodes, angelica, peppermint, and eupatorium.

[0021] In practical implementation, the silver ions can be derived from soluble silver salts, preferably using silver nitrate with a purity ≥99.9% to prepare an aqueous solution of silver ions. Silver ions play a dual role in the system: firstly, they possess broad-spectrum antibacterial capabilities, effectively inhibiting bacterial growth over a long period; secondly, they act as a catalyst to accelerate the decomposition of hydrogen peroxide, generating more reactive hydroxyl radicals, significantly improving the immediate inactivation efficiency against pathogenic microorganisms and aiding in the oxidative degradation of formaldehyde.

[0022] The hydrogen peroxide is the powerful oxidizing agent in the system. During implementation, a commercially available 30% hydrogen peroxide solution can be used for dilution and preparation. Under the catalysis of silver ions, hydrogen peroxide releases hydroxyl radicals, which attack bacterial cell membranes, viral capsid proteins, and nucleic acids, while simultaneously oxidizing and decomposing formaldehyde into harmless carbon dioxide and water.

[0023] The citric acid used is food-grade citric acid, which plays a crucial role in pH adjustment and stabilization. It maintains the system in a weakly acidic environment, preventing silver ions from precipitating due to alkalinity and slowing down the spontaneous decomposition of hydrogen peroxide, thus ensuring product shelf-life stability and long-lasting activity after application.

[0024] The compound herbal extract is made from eight medicinal herbs: patchouli, costus root, clove, mugwort, atractylodes, angelica, peppermint, and eupatorium. This composition is rich in natural active ingredients such as volatile oils, flavonoids, and alkaloids, and has broad-spectrum antibacterial and antiviral efficacy, which can broaden the disinfection spectrum. Its natural aromatic components can neutralize malodorous gases, freshen the air from a sensory perspective, and achieve the dual effects of physical deodorization and chemical decomposition. At the same time, it reduces the irritation of individual chemical components, making the product more gentle and suitable for use by sensitive groups such as mothers, infants, and the elderly.

[0025] Through the scientific combination of the above four categories of components, the single-agent product integrates multiple functions such as high-level virus inactivation, 144-hour long-lasting antibacterial and antiviral effects, efficient formaldehyde removal, and deodorization for the first time, breaking through the technical limitations of traditional air purification products with single functions.

[0026] In a preferred embodiment, the silver ion content is 50–200 ppm.

[0027] When the silver ion content is below 50 ppm, the efficiency of catalyzing hydrogen peroxide to generate active free radicals is insufficient, and the long-term antibacterial ability is also weak. Above 200 ppm, costs increase, and the risk of silver ion precipitation may increase, affecting product stability. Through orthogonal experimental optimization, a silver ion concentration of 125 ppm is particularly preferred in this example. At this concentration, silver ions can efficiently catalyze hydrogen peroxide to generate sufficient hydroxyl radicals, ensuring a 99.99% immediate virus inactivation rate and pathogenic bacteria kill rate. Furthermore, it can form a long-lasting microenvironmental protection after spraying, maintaining an antibacterial inactivation rate stable at over 90% for 144 hours. In practical operation, the target concentration silver ion solution can be prepared by accurately weighing and dissolving the calculated amount of silver nitrate in deionized water.

[0028] In a preferred embodiment, the hydrogen peroxide accounts for 1% to 5% of the total weight of the purifying agent.

[0029] When the hydrogen peroxide content is below 1%, its ability to oxidize and degrade organic pollutants and inactivate pathogenic microorganisms is insufficient, making it difficult to achieve a 99.99% disinfection level. When the content is above 5%, although the disinfection efficacy is enhanced, it may cause slight oxidative corrosion to some sensitive surfaces, and its own decomposition is accelerated, which is not conducive to long-term maintenance. In the example, hydrogen peroxide is preferably 3% of the total weight of the purifier. This concentration can efficiently generate hydroxyl radicals under the catalysis of silver ions. The test results showed that the immediate inactivation rate of influenza A virus H1N1 and human coronavirus 229E reached 99.99%, and the formaldehyde degradation rate reached 98.1% after 48 hours, while taking into account the safety and stability of the product.

[0030] In a preferred embodiment, the citric acid accounts for 0.1% to 0.5% of the total weight of the purifying agent.

[0031] When the citric acid content is below 0.1%, the buffering and stabilizing effect is insufficient, the system pH is prone to fluctuation, which may lead to silver ion precipitation or excessively rapid decomposition of hydrogen peroxide, affecting the product's shelf life and long-term performance. When the content is above 0.5%, the system acidity is too high, which, although beneficial for stability, may increase the risk of slight corrosion to certain sensitive materials. In the examples, citric acid is preferably used at 0.2% of the total weight of the purifying agent. This dosage can precisely control and stabilize the system pH in a weakly acidic range of 4.5-5.5. Experiments have shown that after standing at room temperature in a sealed environment for 6 months, the retention rate of the product's effective ingredients is as high as 96.7%, with no precipitation, no stratification, and no odor.

[0032] As a preferred embodiment, the compound herbal extract is obtained by mixing and extracting agastache, costus root, clove, mugwort, atractylodes, angelica, peppermint and eupatorium in a mass ratio of 2:1:1:2:1.5:1.5:2:1.

[0033] In implementation, eight Chinese herbal medicines conforming to the 2025 edition of the Chinese Pharmacopoeia were weighed according to the following mass ratio: Patchouli: Costus Root: Clove: Artemisia Leaf: Atractylodes Rhizome: Angelica Root: Peppermint: Eupatorium Rhizome = 2:1:1:2:1.5:1.5:2:1. This formulation follows the principles of traditional Chinese medicine compound prescriptions, where Patchouli, Artemisia Leaf, and Peppermint act as the principal herbs for their aromatic properties, dispelling dampness and foulness; Atractylodes Rhizome and Angelica Root act as the assistant herbs for their drying and opening properties; and Clove and Costus Root act as the adjuvant herbs for their warming and qi-regulating properties, and Eupatorium Rhizome acts as the adjuvant herbs for their summer-heat clearing and turbidity-dispelling properties. The synergistic effect of these herbs endows the extract with broad-spectrum antiviral, antibacterial, and natural insect repellent and foulness-dispelling effects. Experimental verification showed that the compound purifier containing this ratio of extract achieved an immediate inactivation rate of 99.99% against H1N1 influenza A virus and human coronavirus 229E, and an immediate kill rate of over 99.98% against Escherichia coli, Staphylococcus aureus, and Candida albicans.

[0034] In a preferred embodiment, the pH value of the purifying agent is 4.5 to 5.5.

[0035] This slightly acidic pH range is one of the key parameters for achieving long-lasting stability and high-efficiency disinfection in the entire compound system. Within this pH range, silver ions can maintain their stable ionic state and are not easily converted into oxides or hydroxide precipitates; the decomposition rate of hydrogen peroxide is effectively controlled, which can meet the free radical release rate required for immediate disinfection and ensure the retention of activity during the 144-hour long-lasting effect; at the same time, this pH range is close to the slightly acidic environment of human skin, ensuring that the product is gentle and non-irritating to the skin. Acute oral toxicity tests and skin irritation tests have verified that the product is practically non-toxic and non-irritating.

[0036] As a preferred embodiment, the compound herbal extract is obtained by ultrasonic extraction of pulverized patchouli, costus root, clove, mugwort, atractylodes, angelica, peppermint, and eupatorium at 15-35°C using an ethanol-water solution as a solvent.

[0037] In this process, eight kinds of Chinese herbal medicines mixed in a certain proportion are pulverized to about 20 mesh. A food-grade ethanol-water solution, five times the total mass of the herbs, is added as the extraction solvent. Extraction is carried out at 25°C and 400W ultrasonic power for 60 minutes. Afterwards, solid-liquid separation is performed by centrifugation or filtration to obtain a room-temperature extract of the Chinese herbal medicines. The core technological significance of this process lies in the fact that the entire process is carried out at a room temperature of 15–35°C, effectively avoiding the thermal destruction of volatile antibacterial and antiviral active ingredients in herbs such as patchouli, peppermint, and mugwort caused by traditional high-temperature decoction. This maximizes the preservation of heat-sensitive active substances such as eucalyptol, eugenol, and menthol, providing a material basis for the product to exert its natural antibacterial, deodorizing, and fragrance-enhancing effects.

[0038] Secondly, this application provides a method for preparing the above-mentioned composite air purifier, comprising the following steps: Step S1: Mix and pulverize the following herbs: patchouli, costus root, clove, mugwort, atractylodes, angelica, peppermint, and eupatorium. Add an ethanol aqueous solution and perform ultrasonic-assisted extraction at 15-35℃. Separate the solid and liquid components to obtain the compound herbal extract. During implementation, first weigh out eight Chinese herbal medicines according to the specified ratio: patchouli, costus root, clove, mugwort, atractylodes, angelica, mint, and eupatorium. Mix and pulverize them, add an appropriate amount of ethanol aqueous solution as a solvent, and use room temperature ultrasonic-assisted extraction technology for extraction. After extraction, solid-liquid separation is performed, and the extract is collected for later use.

[0039] Step S2: Dissolve silver ion source, hydrogen peroxide and citric acid in water, add the compound herbal extract obtained in step S1, and adjust the pH of the system to 4.5-5.5 to obtain the compound air purifier.

[0040] In practice, deionized water is used as the base solvent. Silver ion source (preferably silver nitrate) is added sequentially at room temperature to prepare an aqueous solution containing silver ions. Then, hydrogen peroxide solution is slowly added and stirred until homogeneous. Citric acid is then added as a stabilizer and pH adjuster, and stirred thoroughly until completely dissolved. Subsequently, the compound herbal extract obtained in step S1 is slowly added under continuous stirring. After mixing evenly, the pH value of the system is detected and finely adjusted to the range of 4.5-5.5 using a pH meter. Finally, the system is filtered to remove any possible fine insoluble matter, resulting in a clear and homogeneous composite air purifier product. This preparation method has mild process conditions, is easy to operate, does not require large and complex equipment, and is easy to scale up for industrial production.

[0041] In a preferred embodiment, the power of the ultrasonic-assisted extraction in step S1 is 200-600W, and the extraction time is 30-90 minutes; the silver ion source is silver nitrate.

[0042] In step S1, the preferred power of the ultrasonic-assisted extraction is 200-600W, and the preferred extraction time is 30-90 minutes. If the power is too low or the time is too short, the active ingredients will not be extracted sufficiently. If the power is too high or the time is too long, although the extraction rate can be improved, local overheating may occur, which is not conducive to the protection of heat-sensitive ingredients. In the example, the optimal selection is 400W ultrasonic power and 60 minutes extraction time. Under these conditions, the extract is rich in active ingredients, and its antibacterial and antiviral efficacy is optimal.

[0043] The preferred silver ion source is silver nitrate, which has high purity (≥99.9%) and good solubility, making it easy to accurately control the silver ion concentration to the target range (e.g., 125 ppm). At the same time, the introduced nitrate ions have no adverse effect on the system performance.

[0044] The application of composite air purifiers in the preparation of long-lasting indoor air epidemic prevention and purification products, which have 144-hour continuous antibacterial and antiviral capabilities and can degrade formaldehyde and remove malodorous gases.

[0045] The application refers to formulating the product of this invention into sprays, aerosols, gels, or other suitable dosage forms for air purification and epidemic prevention in indoor environments such as homes, medical facilities, educational institutions, commercial spaces, and public transportation. The long-lasting epidemic prevention and purification product possesses continuous antibacterial and antiviral capabilities for 144 hours. Experimental data shows that 144 hours after spraying, the product still maintains a 91.3% inhibition rate against Escherichia coli and a 92.50% inactivation rate against H1N1 influenza A virus, both remaining above 90%. Simultaneously, the product can degrade formaldehyde, achieving a 92.3% degradation rate in 24 hours and 98.1% in 48 hours; it can also remove malodorous gases such as ammonia, hydrogen sulfide, and trimethylamine, with removal rates exceeding 95%. This application fully leverages the technical advantages of this invention—multiple effects with a single application and six days of long-lasting protection—significantly reducing the frequency and cost of manual disinfection.

[0046] In summary, the composite air purifier, its preparation method, and its application provided in this invention have successfully overcome the technical bottlenecks of traditional air purification products, such as weak disinfection efficiency, short protection time, and single function, through the multi-level synergistic effect among the components. The product integrates 99.99% high-level virus inactivation, 144-hour long-lasting antibacterial and antiviral effects, efficient formaldehyde removal, and broad-spectrum deodorization functions. It is also non-toxic, non-irritating, and free of secondary pollution, and can be widely used in long-term air prevention and treatment in various indoor scenarios, thus possessing good industrial promotion value.

[0047] Example The technical solution of the present invention will be further described in detail below with reference to specific embodiments.

[0048] Example 1: Preparation of Compound Herbal Extract at Room Temperature Eight Chinese herbal medicines that meet the standards of the 2025 edition of the Chinese Pharmacopoeia—patchouli, costus root, clove, mugwort, atractylodes, angelica, mint, and eupatorium—are weighed in a mass ratio of 2:1:1:2:1.5:1.5:2:1, mixed, and then pulverized to about 20 mesh to obtain a mixed herbal medicine powder.

[0049] Place the above mixed powder in an extraction container and add 5 times the total mass of the medicinal materials in a food-grade ethanol aqueous solution (50% ethanol by volume) as the extraction solvent; extract for 60 minutes at room temperature of 25°C under ultrasonic power of 400W; control the temperature within the range of 15-35°C throughout the extraction process to avoid high temperature damage to the volatile antibacterial and antiviral active ingredients.

[0050] After extraction, solid-liquid separation was performed by centrifugation at 4000 r / min for 10 minutes. The supernatant was collected, filtered through a 0.45 μm microporous membrane to remove residue, and a pale yellow compound herbal extract with a natural aroma was obtained at room temperature. The extract was sealed and stored away from light for later use.

[0051] This room-temperature ultrasonic extraction process avoids the damage to heat-sensitive volatile active ingredients such as patchouli alcohol in agastache, menthol in peppermint, eucalyptol in mugwort, and eugenol in cloves caused by traditional high-temperature decoction, thus preserving the natural antibacterial, antiviral, and aromatic deodorizing substances in the medicinal materials to the greatest extent.

[0052] Example 2: Preparation of Composite Air Purifier Taking the preparation of 100kg of product as an example, the preparation steps are as follows: At room temperature, silver nitrate with a purity of ≥99.9% was added to deionized water and stirred thoroughly to dissolve it, thus preparing an aqueous solution with a silver ion concentration of 125 ppm.

[0053] Subsequently, a 30% hydrogen peroxide solution was slowly added under stirring to achieve a mass fraction of 3% in the final product, and the mixture was stirred continuously until homogeneous.

[0054] Add food-grade citric acid to achieve a final product mass fraction of 0.2%, and stir thoroughly until completely dissolved. At this point, check the pH of the system and fine-tune it to a slightly acidic range of 4.5–5.5.

[0055] Under continuous stirring, the room temperature extract of the compound Chinese herbal medicine prepared in Example 1 was slowly added to the above inorganic compound solution. The amount of Chinese herbal medicine extract added was 10% of the total weight of the product. Stirring was continued for 30 minutes to ensure that all components were fully integrated.

[0056] Finally, the mixture is filtered using a 1μm pore size filter to remove any possible fine insoluble matter, resulting in a clear and uniform composite air purifier product. The product is a slightly yellow transparent liquid with a natural herbal aroma.

[0057] Example 3: Product Physicochemical Stability Testing The composite air purifier prepared in Example 2 was sealed in a neutral, light-proof container and stored at room temperature (25±5℃). Samples were taken on the 1st, 30th, 90th, and 180th days after preparation to test its appearance, pH value, and content of active ingredients.

[0058] The results showed that after being left to stand at room temperature in a sealed environment for 6 months, the product remained clear and transparent, with no precipitation, no layering, no discoloration, and no off-odors. The retention rate of the effective components of silver ions and hydrogen peroxide was as high as 96.7%. The product's pH value remained stable within the range of 4.5 to 5.5. The experimental results indicate that citric acid, as a buffer stabilizer, precisely controlled the acid-base environment of the system, effectively inhibited the tendency of silver ions to precipitate due to the alkaline environment, and significantly slowed down the spontaneous decomposition of hydrogen peroxide, thus ensuring the product's shelf-life stability.

[0059] Example 4: Test on the antibacterial and long-lasting antibacterial properties of pathogenic bacteria in pits. Referring to GB 21551.2-2010 "Special Requirements for Antibacterial Materials with Antibacterial, Sterilizing and Purifying Functions in Household and Similar Electrical Appliances", the agar dilution method was used to select common pathogenic bacteria from indoor floors, corners and pit areas: Escherichia coli ATCC25922, Staphylococcus aureus ATCC25923, and Candida albicans ATCC10231 as test strains to test the antibacterial and long-lasting antibacterial properties of the composite air purifier prepared in Example 2.

[0060] The product was evenly sprayed onto the surface of the test carrier. Samples were taken at 0h (immediately), 24h, 72h, and 144h after spraying, and the kill rate and inhibition rate of the three test strains at each time point were tested according to standard methods. The experimental results are shown in Table 1.

[0061] Table 1. Results of Long-Lasting Antibacterial Performance Testing of Pathogenic Bacteria in Sinkholes Experimental data shows that the product has an immediate and powerful killing effect on three common indoor pit pathogens, with an immediate killing rate of over 99.98%. More importantly, during a continuous observation period of 144 hours, the antibacterial rate remained above 90%, effectively preventing secondary growth and rebound of pathogens after spraying, and achieving long-lasting antibacterial protection for up to six days (144 hours). This long-lasting performance comes from the microscopic slow-release protective film formed by silver ions on the carrier surface, and the regulatory effect of the weakly acidic environment maintained by citric acid on the slow release of active oxygen.

[0062] Example 5 Virus inactivation and long-term effectiveness testing Referring to the "Disinfection Technical Specifications", the cell culture method was used to test the virus inactivation rate and long-lasting inactivation performance of the composite air purifier prepared in Example 2 using two respiratory pathogens, influenza A virus H1N1 and human coronavirus 229E, as test virus strains.

[0063] The product was evenly sprayed onto the surface of the test carrier. Samples were taken at 0h (immediately), 24h, 72h, and 144h after spraying, and the inactivation rate of the two viruses at each time point was tested according to the standard method. The experimental results are shown in Table 2.

[0064] Table 2 Results of Virus Long-Term Inactivation Performance Detection Experimental data show that the product achieves an immediate and highly effective inactivation rate of 99.99% against both influenza A virus H1N1 and human coronavirus 229E, meeting high-level epidemic prevention and disinfection standards. During a 144-hour observation period, the product's sustained inactivation rate against both viruses remained consistently above 90%, with long-term inactivation rates of 92.50% and 91.80% respectively after 144 hours. This long-term virus inactivation capability is attributed to the sustained destructive effect of hydroxyl radicals generated by silver ions catalyzing hydrogen peroxide on viral capsid proteins and nucleic acids, as well as the sustained antiviral protective effect formed by the synergistic interaction between the active ingredients of traditional Chinese medicine and the inorganic system. This completely breaks through the industry limitations of conventional purification products, which offer short-term disinfection and facilitate the repeated spread of viruses.

[0065] Example 6 Formaldehyde Degradation Performance Test Referring to GB / T 18883-2022 "Indoor Air Quality Standard", at 1m 3 The formaldehyde degradation performance was tested in a sealed experimental chamber.

[0066] A formaldehyde standard solution was released into the experimental chamber to bring the initial formaldehyde concentration inside to 1.0 mg / m³ (this concentration is 10 times the national standard of 0.1 mg / m³, simulating a severely excessive environment). Subsequently, the composite air purifier prepared in Example 2 was sprayed evenly according to the product usage dosage. Samples were taken at 24 and 48 hours after spraying, and the remaining formaldehyde concentration inside the chamber was measured using a formaldehyde detection analyzer to calculate the formaldehyde degradation rate. The experimental results are shown in Table 3.

[0067] Table 3. Formaldehyde Degradation Performance Test Results Experimental data shows that the product has a highly efficient formaldehyde degradation capability; within 24 hours, it can reduce the formaldehyde concentration, which is 10 times higher than the standard, to 0.077 mg / m³, with a degradation rate of 92.3%; after 48 hours, the formaldehyde concentration further decreases to 0.019 mg / m³, with a degradation rate as high as 98.1%, and the formaldehyde concentration is far below the national safety standard (0.1 mg / m³). This highly efficient formaldehyde degradation performance is due to a triple synergistic mechanism: the strong oxidative decomposition of formaldehyde by hydroxyl radicals generated by hydrogen peroxide and silver ions, the adsorption and complexation of formaldehyde by active ingredients of traditional Chinese medicine, and the catalytic degradation effect of silver ions.

[0068] Example 7 Odor Removal Performance Test The deodorization performance of the composite air purifier prepared in Example 2 was tested in a closed experimental chamber using gas chromatography with ammonia, hydrogen sulfide and trimethylamine as the detection objects.

[0069] Experimental environments were prepared with initial concentrations of ammonia (5.0 mg / m³), hydrogen sulfide (3.0 mg / m³), and trimethylamine (2.0 mg / m³), respectively. After spraying the product and allowing it to react completely, the residual concentrations of each odorous gas were sampled and measured, and the removal rate was calculated. The experimental results are shown in Table 4.

[0070] Table 4 Odor Removal Performance Test Results Experimental data show that the product removes more than 95% of the three typical malodorous gases: ammonia, hydrogen sulfide, and trimethylamine. This high-efficiency deodorization performance comes from a dual mechanism: on the one hand, the acid-base neutralization effect of the hydrogen peroxide oxidation system and citric acid can quickly chemically decompose malodorous gas molecules; on the other hand, the volatile oils and aromatic components in the compound herbal extract at room temperature can refresh the air from a sensory perspective, achieving the dual effects of physical deodorization and chemical decomposition.

[0071] Example 8 Safety Detection In accordance with the "Cosmetic Safety Technical Specifications", the composite air purifier prepared in Example 2 was subjected to acute oral toxicity and skin irritation tests.

[0072] Acute oral toxicity test: Healthy experimental animals were selected and administered the drug via oral gavage once according to standard requirements. The animals were observed for 14 consecutive days, and the symptoms of poisoning and mortality were recorded. The results showed that the product was practically non-toxic.

[0073] Skin irritation test: The product was applied to the intact and broken skin of experimental animals, and a closed patch test was conducted according to the standard requirements. The local skin reaction was observed and scored at the specified time. The results showed that the product was non-irritating to both intact and broken skin, and there were no abnormal reactions such as redness, swelling, edema, or ulceration.

[0074] Safety test results show that the composite air purifier is safe, non-toxic, mild and non-irritating, and meets the usage requirements of sensitive groups such as mothers and infants, children and the elderly. All components of the product use safe and environmentally friendly raw materials, and the decomposition products are mainly water and carbon dioxide, with no risk of secondary pollution.

[0075] Example 9: Verification of the synergistic mechanism To verify the synergistic effect among the components in the composite air purifier of this invention, the following control experiment was conducted: Control group 1: Single-component silver ion solution (125 ppm silver ions); Control group 2: Single-component hydrogen peroxide solution (3% hydrogen peroxide); Control group 3: Silver ion + hydrogen peroxide compound solution (125ppm silver ions + 3% hydrogen peroxide); Control group 4: Silver ion + hydrogen peroxide + citric acid compound solution (125ppm silver ions + 3% hydrogen peroxide + 0.2% citric acid); Experimental group: The composite air purifier prepared in Example 2 of this invention (with added compound Chinese herbal extract).

[0076] The immediate kill rate against Escherichia coli, the 144-hour long-term antibacterial rate, and the 24-hour degradation rate of formaldehyde were tested for each group. The experimental results showed: In terms of immediate sterilization performance, the sterilization rates of single-component silver ions in control group 1 and single-component hydrogen peroxide in control group 2 were significantly lower than those of the silver ion + hydrogen peroxide complex system in control group 3. This indicates that silver ions can catalyze hydrogen peroxide to generate more active hydroxyl radicals, and there is a significant synergistic effect of oxidation between the two.

[0077] In terms of long-lasting antibacterial performance, the 144-hour long-lasting antibacterial rate of control group 3 was significantly lower than that of control group 4 with added citric acid, indicating that citric acid effectively slowed down the decomposition rate of hydrogen peroxide by stabilizing the pH value of the system, thus ensuring long-lasting activity.

[0078] In terms of formaldehyde degradation, the formaldehyde degradation rate of the experimental group (with added herbal extract) was significantly better than that of the control group 4 (without added herbal extract), indicating that the active ingredients in the herbal extract participated in the adsorption and complexation process of formaldehyde and formed a synergistic effect with the inorganic oxidation system.

[0079] In terms of antibacterial and antiviral spectrum, the experimental group showed significantly better virus inactivation effect than all control groups, indicating that the volatile oils, flavonoids, alkaloids and other antiviral active ingredients in the eight-ingredient compound herbal extract, together with inorganic components, broadened the disinfection spectrum and enhanced the broad-spectrum antibacterial and antiviral ability.

[0080] This control experiment fully demonstrates that the outstanding comprehensive performance of the product of this invention stems from the multi-level synergistic effect among silver ions, hydrogen peroxide, citric acid, and compound herbal extracts, rather than a simple superposition of the functions of each component.

[0081] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0082] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A composite air purifier, characterized in that, It contains silver ions, hydrogen peroxide, citric acid, and a compound herbal extract made from patchouli, costus root, clove, mugwort, atractylodes, angelica, peppermint, and eupatorium.

2. The composite air purifier according to claim 1, characterized in that, The silver ion content is 50-200 ppm.

3. The composite air purifier according to claim 1, characterized in that, The hydrogen peroxide accounts for 1% to 5% of the total weight of the purifying agent.

4. The composite air purifier according to claim 1, characterized in that, The citric acid accounts for 0.1% to 0.5% of the total weight of the purifying agent.

5. The composite air purifier according to claim 1, characterized in that, The compound herbal extract was obtained by mixing and extracting agastache, costus root, clove, mugwort, atractylodes, angelica, mint, and eupatorium in a mass ratio of 2:1:1:2:1.5:1.5:2:

1.

6. The composite air purifier according to claim 1, characterized in that, The pH value of the purifying agent is 4.5 to 5.

5.

7. The composite air purifier according to claim 1, characterized in that, The compound herbal extract is obtained by ultrasonic extraction of pulverized patchouli, costus root, clove, mugwort, atractylodes, angelica, peppermint, and eupatorium at 15-35°C using an ethanol-water solution as a solvent.

8. A method for preparing the composite air purifier according to any one of claims 1-7, comprising the following steps: Step S1: Mix and pulverize the following herbs: patchouli, costus root, clove, mugwort, atractylodes, angelica, peppermint, and eupatorium. Add an ethanol aqueous solution and perform ultrasonic-assisted extraction at 15-35℃. Separate the solid and liquid components to obtain the compound herbal extract. Step S2: Dissolve silver ion source, hydrogen peroxide and citric acid in water, add the compound herbal extract obtained in step S1, and adjust the pH of the system to 4.5-5.5 to obtain the compound air purifier.

9. The method according to claim 8, characterized in that, The ultrasonic-assisted extraction in step S1 has a power of 200-600W and an extraction time of 30-90 minutes; the silver ion source is silver nitrate.

10. The application of the composite air purifier according to any one of claims 1-7 in the preparation of a long-lasting indoor air epidemic prevention and purification product, wherein the long-lasting epidemic prevention and purification product has a continuous antibacterial and antiviral capability for 144 hours and can degrade formaldehyde and remove malodorous gases.

Images