A natural plant negative oxygen ion preparation rich in olefins and terpene substances and a preparation method thereof

Abstract

The application provides a natural plant negative oxygen ion preparation rich in olefins and terpene substances and a preparation method thereof, and relates to the field of air purification.The preparation comprises the following raw materials in proportion by weight: modified nano zinc oxide 5-10 parts, nano titanium dioxide 10-25 parts, plant composite extract 5-15 parts, silane coupling agent 1-5 parts, nano tungsten oxide 2-7 parts, porous carrier 5-15 parts, ceramic powder 1-5 parts, polycarboxylate 1-4 parts and water 30-40 parts.The preparation significantly improves the release efficiency of negative oxygen ions and has multiple functions such as photocatalysis, natural antibacterial effect and antioxidant effect of plant extracts.

Description

Technical Field

[0001] This invention relates to the field of air purification, and more specifically, to a natural plant-based negative oxygen ion preparation rich in olefins and terpenes, and its preparation method. Background Technology

[0002] With increasing public concern about indoor air quality, functional materials that release negative oxygen ions have gained widespread popularity. Negative oxygen ions, often referred to as "air vitamins," have functions such as purifying the air, sterilizing and disinfecting, and improving the function of the human respiratory system.

[0003] The high concentration of negative oxygen ions in forests is due to the fact that under sunlight, plants perform photosynthesis, accumulating static charge on their leaves, especially in needle-like leaves or leaf tips where the radius of curvature is small, forming a "point discharge." This process ionizes the surrounding air, causing water and oxygen molecules to lose electrons, thus generating negative oxygen ions. Secondly, the Lenard effect also produces negative oxygen ions. When water films (such as dew or rainwater) on plant leaves rupture due to surface tension or when water droplets splash, water molecules break down, producing positive and negative ions. The negatively charged parts readily combine with oxygen molecules in the air to form negative oxygen ions. Thirdly, the photoelectric effect of volatile plant substances also generates negative oxygen ions. Volatile organic compounds released by plants, such as monoterpenes (the main components of phytoncides), undergo a series of complex photochemical reactions under the catalysis of sunlight (especially ultraviolet light). This process may be accompanied by air ionization, indirectly promoting the generation of negative oxygen ions.

[0004] Therefore, how to induce plants to produce effective negative oxygen ions is an urgent problem to be solved. Summary of the Invention

[0005] The purpose of this invention is to provide a natural plant-based negative oxygen ion preparation rich in olefins and terpenes. Through the scientific formulation of raw materials and the precise optimization of the preparation process, a synergistic breakthrough in catalytic efficiency, stability, and multifunctionality is achieved. A close synergistic mechanism is formed among the components, and the technical effect is comprehensively improved compared with traditional negative oxygen ion preparations.

[0006] Another objective of this invention is to provide a method for preparing a natural plant negative oxygen ion preparation rich in olefins and terpenes. Through high-speed shear dispersion and high-pressure homogenization, the final preparation has a uniform texture and good stability.

[0007] The invention solves its technical problem by employing the following technical solutions.

[0008] On one hand, embodiments of the present invention provide a natural plant-based negative oxygen ion preparation rich in olefins and terpenes, comprising the following raw materials by weight:

[0009] Modified nano zinc oxide 5-10 parts, nano titanium dioxide 10-25 parts, plant composite extract 5-15 parts, silane coupling agent 1-5 parts, nano tungsten oxide 2-7 parts, porous carrier 5-15 parts, ceramic powder 1-5 parts, polycarboxylate 1-4 parts, water 30-40 parts.

[0010] In some embodiments of the present invention, the raw materials include the following by weight:

[0011] 10 parts modified nano zinc oxide, 25 parts nano titanium dioxide, 15 parts plant composite extract, 1 part silane coupling agent, 2 parts nano tungsten oxide, 5 parts porous carrier, 1 part ceramic powder, 4 parts polycarboxylate, and 40 parts water.

[0012] In some embodiments of the present invention, the raw materials include the following by weight:

[0013] 5 parts modified nano zinc oxide, 10 parts nano titanium dioxide, 15 parts plant composite extract, 1 part silane coupling agent, 7 parts nano tungsten oxide, 5 parts porous carrier, 5 parts ceramic powder, 4 parts polycarboxylate, and 40 parts water.

[0014] In some embodiments of the present invention, the preparation method of modified nano zinc oxide includes:

[0015] Silver nitrate solution was slowly added dropwise to nano zinc oxide suspension under stirring for 2-4 hours. The mixture was then filtered, washed, and the filter cake was dried at 80°C for 6-12 hours. Finally, it was calcined in a muffle furnace at 400-500°C for 2-4 hours to obtain Ag / ZnO composite material.

[0016] The Ag / ZnO composite material was dispersed in a mixed solvent of anhydrous ethanol and water, and tetraethyl orthosilicate and ammonia were added. The mixture was stirred and reacted at 40-60℃ for 6-12 hours. After centrifugation, washing, and vacuum drying at 80℃, the modified nano zinc oxide was obtained.

[0017] The amount of silver nitrate and nano zinc oxide added is in the molar ratio of Ag : Zn = 0.5-2.0 : 1.

[0018] In some embodiments of the present invention, the plant compound extract comprises the following raw materials by weight:

[0019] Citrus peel extract 5-10 parts, pine needle extract 5-10 parts, tea extract 1-5 parts, phellodendron leaf extract 1-5 parts, eucalyptus leaf extract 3-8 parts, cypress leaf essential oil 2-5 parts.

[0020] In some embodiments of the present invention, the porous carrier is a mixture of diatomaceous earth, silica and mesoporous molecular sieve in a mass ratio of (1-1.5):1:(0.5-1).

[0021] On the other hand, embodiments of the present invention provide a method for preparing a natural plant-based negative oxygen ion preparation rich in olefins and terpenes, comprising the following steps:

[0022] S1, In a mixing tank, first add half of the total water volume, and under high-speed shearing conditions, add nano titanium dioxide and nano tungsten oxide powder in batches, and continue shearing for 20-30 minutes to obtain a dispersion slurry;

[0023] S2, mix silane coupling agent, ethanol, porous carrier and modified nano zinc oxide, ultrasonically disperse evenly, and then dropwise add to the dispersion slurry, and stir at 500-800 rpm for 30-40 min;

[0024] S3, Under stirring conditions, ceramic powder is added sequentially to the dispersion slurry of step S2, and stirred for 30-40 minutes;

[0025] S4, under stirring conditions, add plant compound extract and polycarboxylate to the dispersion slurry of step S3; after uniform dispersion, add the remaining water.

[0026] S5. Add the dispersed slurry from step S4 into a high-pressure homogenizer and homogenize it 2-3 times under a pressure of 20-40 MPa. Let it stand and mature for 12-24 hours to obtain the negative oxygen ion preparation.

[0027] In some embodiments of the present invention, in step S1, the high-speed shearing speed is 3000-4000 rpm, in step S3, the stirring speed is 500-800 rpm, and in step S4, the stirring speed is 200-400 rpm.

[0028] Compared with the prior art, the embodiments of the present invention have at least the following advantages or beneficial effects:

[0029] The natural plant-based negative oxygen ion preparation rich in olefins and terpenes provided by this invention achieves a synergistic breakthrough in catalytic efficiency, stability, and multifunctionality through the scientific formulation of raw materials and the precise optimization of the preparation process. A close synergistic mechanism is formed among the components, resulting in a comprehensive improvement in technical efficacy compared to traditional negative oxygen ion preparations, as detailed below:

[0030] Firstly, regarding the efficiency of negative oxygen ion generation, this invention constructs a highly efficient synergistic catalytic system integrating nano-titanium dioxide, nano-tungsten oxide, and modified nano-zinc oxide, completely solving the problems of narrow light response range and high electron-hole recombination rate of single catalytic components. After nano-titanium dioxide and nano-tungsten oxide are compounded in a specific ratio, a heterojunction structure is formed by utilizing their energy level differences, broadening the light response spectrum (covering the ultraviolet-visible region) while suppressing the recombination probability of photogenerated electrons and holes, thus increasing catalytic activity by more than 40%. Meanwhile, the silver-doped and silane-coated modified nano-zinc oxide, on the one hand, enhances conductivity and the number of catalytic active sites through the electron transfer effect between Ag and ZnO; on the other hand, the silane coupling agent coating effectively prevents nanoparticle aggregation, improving the uniformity of catalytic component dispersion in the formulation by 50%, further strengthening the synergistic effect with the TiO2-WO3 system, ultimately achieving a negative oxygen ion concentration of 5000-8000 ions / cm³. 3 It improves efficiency by more than 35% compared to traditional single-catalytic system formulations, and can be efficiently activated under natural light conditions without additional energy input, making it suitable for various light-free or low-light scenarios.

[0031] Secondly, the stability and long-lasting effect of the formulation have been significantly optimized, solving the core problems of traditional negative ion formulations such as easy agglomeration, easy loss of active ingredients, and short shelf life. The porous carrier uses diatomaceous earth, silica, and mesoporous molecular sieves in a specific ratio. Its three-dimensional porous structure not only provides stable loading sites for catalytic components and plant extracts, forming an adsorption-sustaining release system, but also prolongs the continuous release time of negative ions, improving the long-lasting effect compared to traditional formulations. At the same time, polycarboxylate, as a highly efficient dispersant, works synergistically with silane coupling agents to effectively reduce the surface energy of nanoparticles, avoiding the catalytic activity decay caused by particle agglomeration during storage. After 12 months of storage under sealed conditions at room temperature, the negative ion generation efficiency still remains above 85% of the initial value. In addition, the addition of ceramic powder not only enhances the mechanical stability of the formulation, but its own mineral activity can also help regulate the pH of the system, providing a suitable microenvironment for the catalytic reaction, further ensuring the performance stability of the formulation under different usage scenarios.

[0032] Furthermore, the plant-based compound extracts endow the formulation with a multi-functional synergistic effect of generating negative oxygen ions, purifying the environment, and inhibiting bacteria. The olefins and terpenes abundant in citrus peel extract, pine needle extract, and Amur cork tree leaf extract not only possess excellent air purification capabilities, effectively adsorbing harmful gases such as formaldehyde and benzene (with an adsorption rate exceeding 60%), but their active functional groups also synergistically interact with hydroxyl radicals and superoxide anions generated by the catalytic system, accelerating the degradation of harmful gases. Simultaneously, the alkaloids in Amur cork tree leaf extract, the eucalyptol in eucalyptus leaf extract, and cypress leaf essential oil work synergistically to achieve an inhibition rate of over 90% against common pathogenic bacteria such as Escherichia coli and Staphylococcus aureus. This achieves an integrated function of increasing negative oxygen ion concentration, purifying harmful gases, and inhibiting bacteria and disinfecting, significantly enhancing its application value compared to traditional single-function formulations that only generate negative oxygen ions. In addition, the plant extracts are all derived from natural plant materials, are non-toxic and harmless, and do not cause secondary pollution. When working synergistically with catalytic components, they can also neutralize some of the free radicals generated during the catalytic process, reduce potential irritation to the human body, and improve the environmental friendliness and safety of the formulation.

[0033] Finally, the high-speed shearing (3000-4000 rpm) in step S1 and the ultrasonic dispersion in step S2 work together to ensure that inorganic components such as nano-titanium dioxide and nano-tungsten oxide are uniformly dispersed and avoid agglomeration. The high-pressure homogenization (20-40 MPa) and static curing process in step S5 allow the components to fully integrate and form a structurally stable dispersion system. This not only improves the ease of use of the formulation (it can be directly sprayed or applied), but also ensures that it can firmly adhere to different substrates (walls, fabrics, air purifier filters) and is not easy to fall off, making it suitable for multiple application scenarios such as indoor, car, and office spaces.

[0034] In summary, this invention significantly improves the generation efficiency and long-term stability of negative oxygen ions through synergistic catalysis between raw materials, loaded sustained release, dispersion stabilization mechanism, and the preparation process that ensures the dispersibility and integrability of components. It also endows the formulation with additional functions such as air purification and antibacterial disinfection, while taking into account environmental protection and safety. It solves the technical defects of traditional negative oxygen ion formulations, such as single function, poor stability and limited application scenarios, and has significant technical advantages and market application prospects. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. Where specific conditions are not specified in the embodiments, conventional conditions or conditions recommended by the manufacturer shall apply. Reagents or instruments whose manufacturers are not specified are all conventional products that can be purchased commercially.

[0036] Specifically, the sources of the raw materials used in the embodiments of the present invention are shown in Table 1.

[0037] Table 1

[0038]

[0039] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other. The present invention will now be described in detail with reference to specific embodiments.

[0040] Example 1

[0041] The natural plant-based negative oxygen ion preparation rich in olefins and terpenes, as described in this embodiment, was prepared according to the following formula and steps.

[0042] 10 parts modified nano zinc oxide, 25 parts nano titanium dioxide, 15 parts plant composite extract, 1 part silane coupling agent, 2 parts nano tungsten oxide, 5 parts porous carrier, 1 part ceramic powder, 4 parts polycarboxylate, and 40 parts water.

[0043] The plant compound extracts include: 10 parts citrus peel extract, 10 parts pine needle extract, 5 parts tea extract, 5 parts phellodendron leaf extract, 8 parts eucalyptus leaf extract, and 5 parts cypress leaf essential oil.

[0044] Citrus peel extract: Citrus peel extract is prepared by steam distillation. This extract is rich in terpenes such as D-limonene. Fresh or dried citrus peels (such as orange, grapefruit, and lemon peels) are pulverized into particles of 2-5 mm. The citrus peel particles are then placed in a steam distillation apparatus, and steam is introduced. The mass ratio of citrus peel to water is approximately 1:5. The steam carries volatile oils and is condensed in a condenser to form an oil-water mixture. Oil-water separation is performed in a receiver, and the upper pale yellow to orange-red oily liquid is the citrus peel extract.

[0045] Pine needle extract: Dried pine needles were chopped to 1-3 cm in length. The pine needles and 1,3-propanediol were mixed at a mass ratio of 1:8 and refluxed at 95-100℃ for 4 hours. The extract was filtered while hot using a plate and frame filter press to remove the leaf residue. After the filtrate was allowed to cool and stand, fine suspended solids were further removed by centrifugation to obtain a dark green liquid pine needle extract with a strong pine aroma.

[0046] Tea extract: Dry tea leaves are pulverized and passed through a 20-mesh sieve. The tea powder is mixed with a deionized water solution containing 30% propylene glycol at a ratio of 1:15. The mixture is stirred and extracted at 60-70℃ for 1 hour. After extraction, it is immediately filtered to obtain a clear, tea-brown filtrate, which is the liquid tea extract.

[0047] Phellodendron amurense leaf extract: Dried Phellodendron amurense leaves were coarsely powdered and soaked in 0.5% dilute hydrochloric acid solution at room temperature for 24 hours (solid-to-liquid ratio 1:10), with intermittent stirring. The filtrate was collected after filtration. The residue was washed again with a small amount of 0.5% dilute hydrochloric acid, and the filtrates were combined. Dilute sodium hydroxide solution was slowly added to the combined filtrate to adjust the pH to 8-9, causing alkaloids and other components to precipitate. After standing, the precipitate was centrifuged and collected. The precipitate was mixed with 1,3-propanediol (precipitate to propylene glycol mass ratio 1:5), heated (40-50℃) and stirred to dissolve the alkaloids in the propylene glycol. The propylene glycol solution was centrifuged, and the supernatant was collected to obtain the liquid Phellodendron amurense leaf extract.

[0048] Eucalyptus leaf extract: Eucalyptus leaves are sun-dried or oven-dried and appropriately pulverized to increase specific surface area. The leaves are then placed in a distillation vessel and saturated steam is introduced. The steam carries the eucalyptus oil with it during distillation. The mixed steam is condensed into an oil-water mixture, which flows into an oil-water separator. Because eucalyptus oil is less dense than water, it naturally separates into two layers on top. The colorless to pale yellow eucalyptus oil from the top layer is collected, and anhydrous sodium sulfate is added for short-term drying to remove trace amounts of moisture. After filtration, the eucalyptus leaf extract (eucalyptus oil) is obtained.

[0049] Cypress Leaf Essential Oil: Dry and pulverize cypress leaves or sawdust. Load the raw material into a high-pressure extraction vessel. Introduce liquid CO2 and adjust the system pressure and temperature (25-35 MPa, 40-50℃) to achieve a supercritical state. The supercritical CO2 fluid permeates the raw material, dissolving the essential oil components. The CO2 fluid containing the essential oil enters a separation vessel, where the CO2 is vaporized and separated from the essential oil by depressurization or heating. Collect the deep yellow to brown viscous liquid in the separation vessel; this is cypress essential oil.

[0050] Preparation steps of modified nano zinc oxide:

[0051] Weigh out the measured amount of nano-zinc oxide powder and disperse it in deionized water to form a uniform suspension. Weigh out silver nitrate according to an Ag:Zn ratio of 1:1 and dissolve it in deionized water. While stirring, slowly add the silver nitrate solution dropwise to the nano-zinc oxide suspension. Continue stirring for 4 hours to allow the Ag... + Ions are loaded onto the ZnO surface through ion exchange and adsorption. The mixture is then filtered, and the precipitate is washed with deionized water and ethanol to remove residual ions. The filter cake is dried at 80°C for 12 hours and then calcined in a muffle furnace at 500°C for 4 hours. This process allows Ag to... + It is reduced to Ag nanoparticles and firmly attached to the ZnO surface to form a heterojunction.

[0052] The Ag / ZnO composite material obtained above was redispersed in a mixed solvent of anhydrous ethanol and water, and ultrasonically treated to ensure uniform dispersion. Tetraethyl orthosilicate and ammonia were added as the silicon source and catalyst, respectively. The reaction was carried out with gentle stirring at 60°C for 12 hours. A thin and uniform silica coating layer was formed on the surface of the Ag / ZnO particles through hydrolysis and condensation. After the reaction was completed, the modified powder was collected by centrifugation, repeatedly washed with ethanol, and finally vacuum dried at 80°C to obtain modified nano-zinc oxide.

[0053] The porous carrier comprises a mixture of diatomaceous earth, silica, and mesoporous molecular sieve in a mass ratio of 1:1:0.5.

[0054] The preparation steps for negative oxygen ion preparations are as follows:

[0055] S1, In a mixing tank, first add half of the total water volume, and under high-speed shear (4000 rpm) conditions, add nano titanium dioxide and nano tungsten oxide powder in 3 batches, and continue shearing for 30 minutes to obtain a dispersion slurry;

[0056] S2, mix silane coupling agent (KH550) with anhydrous ethanol at a mass ratio of 3:5, then add porous carrier and modified nano zinc oxide, ultrasonically disperse evenly (30 min), then dropwise add to the dispersion slurry, and stir at 800 rpm for 40 min;

[0057] S3, under stirring conditions (800 rpm), ceramic powder and porous carrier are added sequentially to the dispersion slurry of step S2, and stirred for 40 min;

[0058] S4, under stirring conditions (400 rpm), add the plant compound extract and polycarboxylate to the dispersion slurry of step S3; after uniform dispersion, add the remaining water.

[0059] S5. Add the dispersion slurry from step S4 to a high-pressure homogenizer, homogenize it three times under a pressure of 40 MPa, and let it stand for 12 hours to obtain the negative oxygen ion preparation.

[0060] Example 2

[0061] The difference from Example 1 is that the formulation of the negative oxygen ion preparation is as follows:

[0062] 5 parts modified nano zinc oxide, 10 parts nano titanium dioxide, 15 parts plant composite extract, 1 part silane coupling agent, 7 parts nano tungsten oxide, 5 parts porous carrier, 5 parts ceramic powder, 4 parts polycarboxylate, and 40 parts water.

[0063] The remaining preparation steps and raw material sources are the same as in Example 1.

[0064] Example 3

[0065] The difference from Example 1 is that the formulation of the negative oxygen ion preparation is as follows:

[0066] 8 parts modified nano zinc oxide, 20 parts nano titanium dioxide, 10 parts plant composite extract, 3 parts silane coupling agent, 5 parts nano tungsten oxide, 10 parts porous carrier, 3 parts ceramic powder, 2 parts polycarboxylate, and 35 parts water.

[0067] The remaining preparation steps and raw material sources are the same as in Example 1.

[0068] Example 4

[0069] The difference from Example 1 is that the formulation of the negative oxygen ion preparation is as follows:

[0070] 5 parts modified nano zinc oxide, 25 parts nano titanium dioxide, 5 parts plant composite extract, 5 parts silane coupling agent, 5 parts nano tungsten oxide, 15 parts porous carrier, 1 part ceramic powder, 4 parts polycarboxylate, and 40 parts water.

[0071] The remaining preparation steps and raw material sources are the same as in Example 1.

[0072] Example 5

[0073] The difference from Example 1 is that when modifying nano zinc oxide, the molar ratio of Ag:Zn is 0.5:1, while the other raw material ratios, preparation steps, and raw material sources are the same as in Example 1.

[0074] Example 6

[0075] The difference from Example 1 is that the molar ratio of Ag:Zn is 2:1 when modifying the nano-zinc oxide. All other raw material ratios, preparation steps, and raw material sources are the same as in Example 1.

[0076] Example 7

[0077] The difference from Example 1 is that the plant compound extract includes: 5 parts citrus peel extract, 5 parts pine needle extract, 1 part tea extract, 1 part Amur cork tree leaf extract, 8 parts eucalyptus leaf extract, and 5 parts cypress leaf essential oil. The remaining ingredient ratios, preparation steps, and sources are the same as in Example 1.

[0078] Example 8

[0079] The difference from Example 1 is that the plant compound extract includes: 8 parts citrus peel extract, 8 parts pine needle extract, 5 parts tea extract, 3 parts phellodendron leaf extract, 55 parts eucalyptus leaf extract, and 5 parts cypress leaf essential oil. The remaining raw material ratios, preparation steps, and raw material sources are the same as in Example 1.

[0080] Example 9

[0081] The difference from Example 1 is that the plant compound extract includes: 10 parts citrus peel extract, 5 parts pine needle extract, 5 parts tea extract, 3 parts phellodendron leaf extract, 8 parts eucalyptus leaf extract, and 3 parts cypress leaf essential oil. The remaining raw material ratios, preparation steps, and raw material sources are the same as in Example 1.

[0082] Example 10

[0083] The difference from Example 1 is that the porous carrier is a mixture of diatomaceous earth, silica, and mesoporous molecular sieve in a mass ratio of 1.5:1:1. All other raw material ratios, preparation steps, and raw material sources are the same as in Example 1.

[0084] Example 11

[0085] The difference from Example 1 is that the porous carrier is a mixture of diatomaceous earth, silica, and mesoporous molecular sieve in a mass ratio of 1.5:1:0.5. All other raw material ratios, preparation steps, and raw material sources are the same as in Example 1.

[0086] Comparative Example 1

[0087] The difference from Example 1 is that no modification treatment is performed on the nano-zinc oxide. The remaining raw material ratios, preparation steps, and raw material sources are the same as in Example 1.

[0088] Comparative Example 2

[0089] The difference from Example 1 is that no porous carrier is added, plant extract is used to make up the difference, and the other raw material ratios, preparation steps, raw material sources, etc. are the same as those in Example 1.

[0090] Experimental Example

[0091] The following tests were conducted using the natural plant negative oxygen ion preparations rich in olefins and terpenes from Examples 1-11 and Comparative Examples 1-2 as test subjects.

[0092] Negative oxygen ion release concentration: 10g of the preparation is evenly coated onto an area of ​​0.1 m². 2 Placed on a glass plate 1 m 3The sample was placed in a sealed chamber. Chamber conditions: temperature (25±2)℃, humidity (50±5)%, no light, no forced ventilation. Negative oxygen ion detectors (Japan ITEC-AP-2 type) were used to measure the ions at a distance of 0.5 m from the center of the sample. Data were recorded every hour for 24 hours, and the average value after stabilization was taken.

[0093] Formaldehyde purification efficiency: at the same 1 m 3 The initial concentration injected into the sealed chamber was approximately (2.0 ± 0.2) mg / m³. 3 Formaldehyde gas was introduced. A sample coated with the preparation was placed inside, and the formaldehyde concentration change in the chamber was monitored using a formaldehyde analyzer (PPM-400ST, UK). The formaldehyde purification rate was calculated after 24 hours.

[0094] Far-infrared emissivity: The prepared coating sample was tested using a far-infrared emissivity tester (Japanese JIS R 1801 standard instrument), and the emissivity value was directly read.

[0095] Plant essential oil sustained-release time: The sample coated with the formulation was placed in a constant temperature and humidity chamber, and clean air was introduced at a flow rate of 1 L / min. The concentration of characteristic terpenes (D-limonene, pinene) in the outlet gas was detected periodically using gas chromatography-mass spectrometry (GC-MS). The sustained-release endpoint was recorded when the concentration dropped to 10% of the initial concentration. The results are shown in Table 2.

[0096] Table 2

[0097]

[0098] Table 2 shows that, compared to Comparative Example 1, the concentration of negative oxygen ions and the formaldehyde purification rate dropped sharply (by more than 50%). This indicates that without the addition of modified nano-zinc oxide, the catalytic effect is weakened, and the release of negative oxygen ions is reduced. The plant essential oil release time in Comparative Example 2 is only about 5 days, while the plant essential oil release time in the examples with porous carriers all exceed 30 days. Furthermore, its formaldehyde purification rate is also the lowest, indicating that the porous carrier, through the slow release of plant essential oils and the enrichment of pollutants, is crucial for maintaining the long-term cleanliness of the photocatalyst.

[0099] The negative ion preparation provided in this invention constitutes a highly efficient production-reaction-release closed loop at the microscopic level: a porous structure, especially mesoporous molecular sieves, adsorbs and protects plant essential oils and catalysts. Plant essential oils, as raw materials, are slowly released within the carrier, providing a high concentration of reaction substrates. Under light-driven conditions, the catalyst efficiently converts the plant essential oils into negative ions and harmless byproducts. Far-infrared ceramic powder activates water molecules, assisting in the generation of negative ions through the Lenard effect and enhancing environmental comfort.

[0100] The embodiments described above are some, but not all, embodiments of the present invention. The detailed description of the embodiments of the present invention is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

Claims

1. A natural plant-based negative oxygen ion preparation rich in olefins and terpenes, characterized in that, By weight, it includes the following ingredients: Modified nano zinc oxide 5-10 parts, nano titanium dioxide 10-25 parts, plant composite extract 5-15 parts, silane coupling agent 1-5 parts, nano tungsten oxide 2-7 parts, porous carrier 5-15 parts, ceramic powder 1-5 parts, polycarboxylate 1-4 parts, water 30-40 parts. Methods for preparing modified nano zinc oxide include: Silver nitrate solution was slowly added dropwise to nano zinc oxide suspension under stirring for 2-4 hours. The mixture was then filtered, washed, and the filter cake was dried at 80°C for 6-12 hours. Finally, it was calcined in a muffle furnace at 400-500°C for 2-4 hours to obtain Ag / ZnO composite material. The Ag / ZnO composite material was dispersed in a mixed solvent of anhydrous ethanol and water, and tetraethyl orthosilicate and ammonia were added. The mixture was stirred at 40-60℃ for 6-12 hours. Centrifugation, washing, and vacuum drying at 80°C yielded the modified nano zinc oxide. The plant compound extract, by weight, includes the following ingredients: Citrus peel extract 5-10 parts, pine needle extract 5-10 parts, tea extract 1-5 parts, phellodendron leaf extract 1-5 parts, eucalyptus leaf extract 3-8 parts, cypress leaf essential oil 2-5 parts. The porous carrier is a mixture of diatomaceous earth, silica, and mesoporous molecular sieve in a mass ratio of (1-1.5):1:(0.5-1). The amount of silver nitrate and nano zinc oxide added is in the molar ratio of Ag : Zn = 0.5-2.0 :

1.

2. The natural plant-based negative oxygen ion preparation rich in olefins and terpenes according to claim 1, characterized in that, By weight, it includes the following ingredients: 10 parts modified nano zinc oxide, 25 parts nano titanium dioxide, 15 parts plant composite extract, 1 part silane coupling agent, 2 parts nano tungsten oxide, 5 parts porous carrier, 1 part ceramic powder, 4 parts polycarboxylate, and 40 parts water.

3. The natural plant-based negative oxygen ion preparation rich in olefins and terpenes according to claim 1, characterized in that, By weight, it includes the following ingredients: 5 parts modified nano zinc oxide, 10 parts nano titanium dioxide, 15 parts plant composite extract, 1 part silane coupling agent, 7 parts nano tungsten oxide, 5 parts porous carrier, 5 parts ceramic powder, 4 parts polycarboxylate, and 40 parts water.

4. A method for preparing a natural plant-based negative oxygen ion preparation rich in olefins and terpenes as described in any one of claims 1-3, characterized in that, Includes the following steps: S1, In a mixing tank, first add half of the total water volume, and under high-speed shearing conditions, add nano titanium dioxide and nano tungsten oxide powder in batches, and continue shearing for 20-30 minutes to obtain a dispersion slurry; S2, mix silane coupling agent, ethanol, porous carrier and modified nano zinc oxide, ultrasonically disperse evenly, and then dropwise add to the dispersion slurry, and stir at 500-800 rpm for 30-40 min; S3, Under stirring conditions, add ceramic powder to the dispersion slurry from step S2 and stir for 30-40 minutes; S4, under stirring conditions, add plant compound extract and polycarboxylate to the dispersion slurry of step S3; after uniform dispersion, add the remaining water. S5. Add the dispersed slurry from step S4 into a high-pressure homogenizer and homogenize it 2-3 times under a pressure of 20-40 MPa. Let it stand and mature for 12-24 hours to obtain the negative oxygen ion preparation.

5. The method for preparing the natural plant negative oxygen ion preparation rich in olefins and terpenes according to claim 4, characterized in that, In step S1, the high-speed shearing speed is 3000-4000 rpm; in step S3, the stirring speed is 500-800 rpm; and in step S4, the stirring speed is 200-400 rpm.

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