Multi-factor synergistic air disinfection device as well as preparation method and application thereof

Abstract

The invention belongs to the technical field of air purification, and provides a multi-factor synergistic air disinfection device as well as a preparation method and application thereof. The multi-factor synergistic air disinfection device comprises a filter screen with nano-silver loaded on two sides, a noble metal doped photocatalytic array and an ozone decomposition catalyst, in the noble metal doped photocatalytic array, noble metals comprise platinum, palladium and silver, and the photocatalytic array is a TiO2-ZnO array. According to the device, a double-sided nano-silver loaded HEPA filter screen and a precious metal doped photocatalytic array are creatively integrated, and a triple synergistic disinfection system of physical interception, chemical catalysis and metal ion sterilization is constructed. Through the synergistic effect between the antibacterial properties of Ag, Pt and Pd and the photocatalytic properties of anatase type nano TiO2 and ZnO, the antibacterial agent has efficient and long-acting and stable sterilization effects, and is suitable for closed circulating systems such as vehicle-mounted air conditioners and central air conditioners.

Description

Technical Field

[0001] The present invention relates to the technical field of air purification, and in particular to a multi-factor coordinated air disinfection device, a preparation method and an application thereof. Background Art

[0002] Particulate matter, volatile organic compounds, and pathogenic microorganisms are the three major sources of indoor pollution. Particulate matter can increase the risk of respiratory and cardiovascular diseases, and can even cause cancer. Volatile organic compounds (VOCs) are organic compounds with a saturated vapor pressure greater than 70 Pa at room temperature and a boiling point below 260°C at normal pressure. These include aliphatic hydrocarbons, aromatic hydrocarbons, oxygen-containing organic compounds, halogen-containing organic compounds, nitrogen-containing organic compounds, and sulfur-containing organic compounds. VOCs pose serious risks to both the environment and human health. They can also react photochemically with ozone and other gases, producing photochemical smog. Pathogenic microorganisms can cause respiratory infections, allergic reactions, or systemic infections.

[0003] Air purification is crucial for disease prevention and particulate matter protection. However, traditional filter materials only filter viruses and bacteria. When filtered viruses, bacteria, and particulate matter settle on the filter, they multiply rapidly in humid climates, easily causing secondary air pollution. Existing air purification devices suffer from limited functionality, residual products and byproducts, inability to operate with humans, low disinfection efficiency, and limitations on long-term use.

[0004] Therefore, it is of great value and significance to provide a multi-factor synergistic air disinfection device with high efficiency sterilization, long-term stability and a preparation method thereof. Summary of the Invention

[0005] The purpose of the present invention is to provide a multi-factor synergistic air disinfection device and its preparation method and application in order to overcome the deficiencies of the prior art.

[0006] In order to achieve the above-mentioned object of the invention, the present invention provides the following technical solutions:

[0007] The present invention provides a multi-factor synergistic air disinfection device, which includes a filter with double-sided nanosilver loading, a precious metal-doped photocatalytic array, and an ozone decomposition catalyst; in the precious metal-doped photocatalytic array, the precious metals include platinum, palladium and silver, and the photocatalytic array is a TiO2-ZnO array.

[0008] Preferably, the polluted air passes through a filter with nano-silver loaded on both sides, a noble metal doped photocatalytic array, an ultraviolet lamp, a noble metal doped photocatalytic array, a filter with nano-silver loaded on both sides, and an ozone decomposition catalyst in sequence to obtain clean air.

[0009] The present invention also provides a method for preparing the multi-factor collaborative air disinfection device, comprising the following steps:

[0010] 1) placing the filter in a silver solution for reaction and then drying to obtain a filter loaded with nanosilver on both sides;

[0011] 2) Ultrasonic dispersion of nano-TiO2, zinc nitrate, and water to obtain a dispersion, and placing the titanium mesh in a mixture of the dispersion and a NaOH solution to react to obtain a titanium mesh containing a TiO2-ZnO array;

[0012] 3) immersing the titanium mesh containing the TiO2-ZnO array in a noble metal solution, followed by drying and calcining to obtain a noble metal-doped photocatalytic array;

[0013] 4) The carbon fibers are placed in a nickel-cobalt solution, reacted under closed conditions, and then dried and heat-treated to obtain an ozone decomposition catalyst.

[0014] Preferably, the silver solution in step 1) comprises silver nitrate, polyethylene glycol, hydrazine hydrate solution and water; the mass ratio of silver nitrate, polyethylene glycol and hydrazine hydrate solution is 2-4:5:8-16, the mass fraction of hydrazine hydrate solution is 8-12%, and the mass volume ratio of silver nitrate and water is 2-4g:100mL; the reaction temperature is 50-70°C, and the reaction time is 2-3h.

[0015] Preferably, in step 2), the mass ratio of nano-TiO2 to zinc nitrate is 1:5-7, the volume mass ratio of NaOH solution to nano-TiO2 is 30-40 mL:1 g; the ultrasonic dispersion time is 10-20 min, the reaction temperature is 80-90° C., and the reaction time is 2-3 h.

[0016] Preferably, the precious metal solution in step 3) is a chloroplatinic acid solution, a palladium chloride solution, and a silver nitrate solution; the concentration of the chloroplatinic acid solution is 7 to 10 g / L, the concentration of the palladium chloride solution is 4 to 6 g / L, and the concentration of the silver nitrate solution is 10 to 18 g / L. In the precious metal solution, the molar ratio of platinum, palladium, and silver is 1:0.8 to 1.2:2.5 to 3.5.

[0017] Preferably, in step 3), the impregnation time is 3 to 5 minutes, the drying temperature is 150 to 200° C., the drying time is 4 to 6 hours, the calcination temperature is 450 to 550° C., and the calcination time is 3 to 5 hours.

[0018] Preferably, in step 4), the nickel-cobalt solution comprises a soluble nickel salt, a soluble cobalt salt, hydrazine hydrate and water, wherein the soluble nickel salt is nickel nitrate, nickel chloride or nickel acetate, and the soluble cobalt salt is cobalt nitrate, cobalt chloride or cobalt acetate. In the nickel-cobalt solution, the molar ratio of nickel ions to cobalt ions is 0.8-1.2:0.8-1.2, the total molar concentration of nickel ions and cobalt ions is 0.08-0.15 mol / L, and the volume ratio of hydrazine hydrate to water is 1:2-4.

[0019] Preferably, the reaction temperature in step 4) is 180-220° C., the reaction time is 8-15 h, the drying temperature is 80-100° C., the drying time is 5-8 h, the heat treatment temperature is 300-350° C., the heat treatment time is 0.5-1.5 h, and the heat treatment is carried out under a protective atmosphere.

[0020] The present invention also provides application of the multi-factor coordinated air disinfection device in a closed circulation system.

[0021] The beneficial effects of the present invention include the following:

[0022] 1) The device innovatively integrates a double-sided nanosilver-loaded HEPA filter with a precious metal-doped photocatalytic array, creating a triple-layered disinfection system: physical interception, chemical catalysis, and metal ion sterilization. The synergistic effect between the antibacterial properties of Ag, Pt, and Pd and the photocatalytic properties of anatase-type nano-TiO2 and ZnO provides highly effective, long-lasting, and stable sterilization.

[0023] 2) The precious metal-doped photocatalytic array possesses a large specific surface area and catalytic activity; the ozone decomposition catalyst accelerates the self-decomposition process of ozone, resolving the ozone pollution problem associated with long-term use of UV lamps. The device is particularly suitable for closed-circulation systems such as vehicle air conditioners and central air conditioners, offering high-efficiency sterilization, long-term stability, and low energy consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic diagram of the multi-factor collaborative air disinfection device of the present invention. DETAILED DESCRIPTION

[0025] The present invention provides a multi-factor synergistic air disinfection device, which includes a filter with double-sided nanosilver loading, a precious metal-doped photocatalytic array, and an ozone decomposition catalyst; in the precious metal-doped photocatalytic array, the precious metals include platinum, palladium and silver, and the photocatalytic array is a TiO2-ZnO array.

[0026] In the present invention, the polluted air preferably passes through a filter screen loaded with nanosilver on both sides, a noble metal doped photocatalytic array, an ultraviolet lamp, a noble metal doped photocatalytic array, a filter screen loaded with nanosilver on both sides, and an ozone decomposition catalyst in sequence to obtain clean air.

[0027] In the present invention, the filter is preferably a HEPA filter, and more preferably an H13 grade HEPA filter.

[0028] The present invention also provides a method for preparing the multi-factor collaborative air disinfection device, comprising the following steps:

[0029] 1) placing the filter in a silver solution for reaction and then drying to obtain a filter loaded with nanosilver on both sides;

[0030] 2) Ultrasonic dispersion of nano-TiO2, zinc nitrate, and water to obtain a dispersion, and placing the titanium mesh in a mixture of the dispersion and a NaOH solution to react to obtain a titanium mesh containing a TiO2-ZnO array;

[0031] 3) immersing the titanium mesh containing the TiO2-ZnO array in a noble metal solution, followed by drying and calcining to obtain a noble metal-doped photocatalytic array;

[0032] 4) The carbon fibers are placed in a nickel-cobalt solution, reacted under closed conditions, and then dried and heat-treated to obtain an ozone decomposition catalyst.

[0033] In the present invention, the silver solution in step 1) preferably comprises silver nitrate, polyethylene glycol, hydrazine hydrate solution and water; the mass ratio of silver nitrate, polyethylene glycol and hydrazine hydrate solution is preferably 2-4:5:8-16, more preferably 2.5-3.5:5:9-14, more preferably 3:5:10-12, the mass fraction of hydrazine hydrate solution is preferably 8-12%, more preferably 9-11%, more preferably 10%, the mass volume ratio of silver nitrate and water is preferably 2-4g:100mL, more preferably 2.5-3.5g:100mL, more preferably 3g:100mL; the reaction temperature is preferably 50-70°C, more preferably 55-65°C, more preferably 60°C; the reaction time is preferably 2-3h, more preferably 2.5h.

[0034] In the present invention, silver nitrate is reduced by hydrazine hydrate to prepare a silver-loaded filter; polyethylene glycol not only serves as a reducing agent but also plays a protective and stabilizing role to prevent aggregation of nanosilver particles; the molecular weight of the polyethylene glycol is preferably 800 to 1200, and more preferably 900 to 1000.

[0035] In the present invention, the particle size of the nanosilver is preferably 10 to 50 nm, more preferably 20 to 40 nm.

[0036] In the present invention, the mass ratio of nano-TiO2 and zinc nitrate in step 2) is preferably 1:5-7, more preferably 1:5.5-6.5, and more preferably 1:6; the volume mass ratio of NaOH solution to nano-TiO2 is preferably 30-40 mL:1 g, more preferably 32-38 mL:1 g, and more preferably 35-36 mL:1 g; the ultrasonic dispersion time is preferably 10-20 min, more preferably 12-18 min, and more preferably 15-16 min; the reaction temperature is preferably 80-90°C, more preferably 82-87°C, and more preferably 84-85°C; the reaction time is preferably 2-3 h, and more preferably 2.5 h.

[0037] In the present invention, the nano-TiO2 in step 3) is preferably anatase-type, and the particle size of the nano-TiO2 is preferably 100-300 nm, more preferably 150-250 nm, and more preferably 200 nm; the NaOH solution is an aqueous solution of NaOH, and the mass fraction of the NaOH solution is preferably 5-10%, and more preferably 6-8%.

[0038] In the present invention, the precious metal solution in step 3) is preferably a chloroplatinic acid solution, a palladium chloride solution and a silver nitrate solution; the concentration of the chloroplatinic acid solution is preferably 7 to 10 g / L, more preferably 8 to 9 g / L, more preferably 8.5 g / L, the concentration of the palladium chloride solution is preferably 4 to 6 g / L, more preferably 4.5 to 5.5 g / L, more preferably 5 g / L, the concentration of the silver nitrate solution is preferably 10 to 18 g / L, more preferably 12 to 16 g / L, more preferably 14 to 15 g / L, and the molar ratio of platinum, palladium and silver in the precious metal solution is preferably 1:0.8 to 1.2:2.5 to 3.5, more preferably 1:0.9 to 1.1:2.8 to 3.2, more preferably 1:1:3.

[0039] In the present invention, the solvents of the chloroplatinic acid solution, the palladium chloride solution and the silver nitrate solution are all water.

[0040] In the present invention, the impregnation time in step 3) is preferably 3 to 5 minutes, more preferably 4 minutes, the drying temperature is preferably 150 to 200°C, more preferably 160 to 190°C, more preferably 170 to 180°C, the drying time is preferably 4 to 6 hours, more preferably 4.5 to 5.5 hours, more preferably 5 hours, the calcination temperature is preferably 450 to 550°C, more preferably 470 to 530°C, more preferably 500 to 510°C, and the calcination time is preferably 3 to 5 hours, more preferably 3.5 to 4.5 hours, more preferably 4 hours.

[0041] In the present invention, the nickel-cobalt solution in step 4) preferably comprises a soluble nickel salt, a soluble cobalt salt, hydrazine hydrate and water, the soluble nickel salt is preferably nickel nitrate, nickel chloride or nickel acetate, the soluble cobalt salt is preferably cobalt nitrate, cobalt chloride or cobalt acetate, and the molar ratio of nickel ions to cobalt ions in the nickel-cobalt solution is preferably 0.8-1.2:0.8-1.2, more preferably 0.9-1.1:0.9-1.1, more preferably 1:1, the total molar concentration of nickel ions and cobalt ions is preferably 0.08-0.15 mol / L, more preferably 0.09-0.13 mol / L, more preferably 0.1-0.12 mol / L, and the volume ratio of hydrazine hydrate to water is preferably 1:2-4, more preferably 1:3.

[0042] In the present invention, the temperature of the reaction in step 4) is preferably 180-220°C, more preferably 190-210°C, more preferably 200°C, the reaction time is preferably 8-15h, more preferably 10-13h, more preferably 11-12h, the drying temperature is preferably 80-100°C, more preferably 85-95°C, more preferably 90°C, the drying time is preferably 5-8h, more preferably 6-7h, the heat treatment temperature is preferably 300-350°C, more preferably 310-340°C, more preferably 320-330°C, the heat treatment time is preferably 0.5-1.5h, more preferably 1h, and the heat treatment is preferably carried out under a protective atmosphere, and the protective atmosphere is preferably a nitrogen atmosphere or an argon atmosphere.

[0043] The present invention also provides application of the multi-factor coordinated air disinfection device in a closed circulation system.

[0044] The technical solutions provided by the present invention are described in detail below with reference to the embodiments, but they should not be construed as limiting the scope of protection of the present invention.

[0045] In the embodiments and comparative examples, the HEPA filter is an H13 grade HEPA filter with dimensions of 320 mm × 320 mm × 10 mm; the metal titanium mesh has a length and width of 320 mm, a thickness of 3 mm, and a mesh size of 0.3 mm × 0.5 mm; the carbon fiber cloth is T300 carbon fiber cloth with a length and width of 320 mm and a thickness of 0.5 mm; the nano-TiO2 is anatase nano-TiO2 with a particle size of 200 nm; and the wavelength of the ultraviolet lamp is 254 nm.

[0046] Example 1

[0047] The HEPA filter was placed in a silver solution consisting of silver nitrate, polyethylene glycol 1000, hydrazine hydrate solution and distilled water, the mass ratio of silver nitrate, polyethylene glycol 1000 and hydrazine hydrate solution was 3:5:12, the mass volume ratio of silver nitrate and distilled water was 3g:100mL, the mass fraction of hydrazine hydrate solution was 10%, and the reaction was carried out at 60°C for 2.5h, and then the HEPA filter was dried at 40°C for 5h to obtain a filter with double-sided nanosilver loading (the particle size of the nanosilver was 20-40nm, and the loading thickness of the nanosilver on one side was 0.1mm).

[0048] Nano-TiO2, zinc nitrate and distilled water were ultrasonically dispersed at a power of 300W for 15 minutes to obtain a dispersion, and the dispersion was mixed with a NaOH solution to obtain a mixed solution. The mass ratio of nano-TiO2 and zinc nitrate was 1:6, the mass volume ratio of nano-TiO2, distilled water and NaOH solution was 1g:100mL:35mL, and the mass fraction of NaOH solution was 6%; the metal titanium mesh was immersed in the mixed solution and reacted at 85°C for 2.5 hours to obtain a titanium mesh containing a TiO2-ZnO array.

[0049] The precious metal solution consists of chloroplatinic acid solution, palladium chloride solution and silver nitrate solution. The concentration of the chloroplatinic acid solution is 8 g / L, the concentration of the palladium chloride solution is 5 g / L, and the concentration of the silver nitrate solution is 15 g / L. In the precious metal solution, the molar ratio of platinum, palladium and silver is 1:1:3. The titanium mesh containing the TiO2-ZnO array is immersed in the precious metal solution for 4 minutes and then dried and calcined in sequence. The drying temperature is 180°C and the time is 5 hours. The calcination temperature is 500°C and the time is 4 hours to obtain a titanium mesh with precious metal-doped photocatalytic arrays on the upper and lower surfaces (the thickness of the single side of the precious metal-doped photocatalytic array is 0.2 mm).

[0050] The carbon fiber cloth was completely immersed in a nickel-cobalt solution composed of nickel nitrate, cobalt nitrate, hydrazine hydrate and distilled water (the total molar concentration of nickel ions and cobalt ions was 0.1 mol / L, the molar ratio of nickel ions to cobalt ions was 1:1, and the volume ratio of hydrazine hydrate to distilled water was 1:3). The reaction was carried out under closed conditions at 200°C for 12 hours. The reaction product was dried at 90°C for 7 hours and then heat-treated at 330°C in a nitrogen atmosphere for 1 hour to obtain an ozone decomposition catalyst.

[0051] The polluted air passes through the double-sided nanosilver-loaded filter, the precious metal-doped photocatalytic array, the ultraviolet lamp, the precious metal-doped photocatalytic array, the double-sided nanosilver-loaded filter, and the ozone decomposition catalyst in sequence to obtain clean air.

[0052] In the device of this embodiment, the silver ion release rate is 0.08 μg / cm2·h; the specific surface area of ​​the precious metal-doped photocatalytic array is 155 m2 / g; the light intensity distribution uniformity of the ozone decomposition catalyst reaches 92%; when the device is in operation, the HEPA layer intercepts 99.98% of particles larger than 0.3 μm, and the nanosilver continuously releases antibacterial ions; organic matter carried by the aerosol is decomposed into CO2 and H2O in the photocatalytic layer, and the precious metal doping increases the quantum efficiency to 70%. When operated at 25°C, 60% relative humidity, and a wind speed of 30 cm / s, the virus inactivation rate reaches 99.99% within 1 hour.

[0053] Example 2

[0054] The HEPA filter was placed in a silver solution consisting of silver nitrate, polyethylene glycol 1000, hydrazine hydrate solution and distilled water, with the mass ratio of silver nitrate, polyethylene glycol 1000 and hydrazine hydrate solution being 2.5:5:10, the mass volume ratio of silver nitrate and distilled water being 2.5 g:100 mL, and the mass fraction of hydrazine hydrate solution being 9%. The reaction was carried out at 55°C for 3 hours, and then the HEPA filter was dried at 40°C for 5 hours to obtain a filter with double-sided nanosilver loading (the nanosilver particle size was 30-40 nm, and the single-sided nanosilver loading thickness was 0.11 mm).

[0055] Nano-TiO2, zinc nitrate and distilled water were ultrasonically dispersed at a power of 350W for 12 minutes to obtain a dispersion, and the dispersion was mixed with a NaOH solution to obtain a mixed solution. The mass ratio of nano-TiO2 and zinc nitrate was 1:5.5, the mass volume ratio of nano-TiO2, distilled water and NaOH solution was 1g:100mL:36mL, and the mass fraction of NaOH solution was 8%; the metal titanium mesh was immersed in the mixed solution and reacted at 80°C for 3 hours to obtain a titanium mesh containing a TiO2-ZnO array.

[0056] The precious metal solution consists of chloroplatinic acid solution, palladium chloride solution and silver nitrate solution. The concentration of the chloroplatinic acid solution is 9 g / L, the concentration of the palladium chloride solution is 4 g / L, and the concentration of the silver nitrate solution is 16 g / L. In the precious metal solution, the molar ratio of platinum, palladium and silver is 1:0.9:3.2. The titanium mesh containing the TiO2-ZnO array is immersed in the precious metal solution for 3 minutes and then dried and calcined in sequence. The drying temperature is 160°C and the time is 5.5 hours. The calcination temperature is 470°C and the time is 5 hours to obtain a titanium mesh with precious metal-doped photocatalytic arrays on the upper and lower surfaces (the single-sided thickness of the precious metal-doped photocatalytic array is 0.18 mm).

[0057] The carbon fiber cloth was completely immersed in a nickel-cobalt solution composed of nickel chloride, cobalt chloride, hydrazine hydrate and distilled water (the total molar concentration of nickel ions and cobalt ions was 0.09 mol / L, the molar ratio of nickel ions to cobalt ions was 1:0.9, and the volume ratio of hydrazine hydrate to distilled water was 1:3). The reaction was carried out under closed conditions at 180°C for 13 hours. The reaction product was dried at 85°C for 8 hours and then heat-treated at 320°C in a nitrogen atmosphere for 1.5 hours to obtain an ozone decomposition catalyst.

[0058] The polluted air passes through the double-sided nanosilver-loaded filter, the precious metal-doped photocatalytic array, the ultraviolet lamp, the precious metal-doped photocatalytic array, the double-sided nanosilver-loaded filter, and the ozone decomposition catalyst in sequence to obtain clean air.

[0059] In the device of this embodiment, the silver ion release rate is 0.09 μg / cm2·h; the specific surface area of ​​the noble metal doped photocatalytic array is 152m 2 / g; the uniformity of light intensity distribution of the ozone decomposition catalyst reaches 91%; when the device is in operation, the HEPA layer intercepts 99.97% of particles larger than 0.3μm, and nanosilver continuously releases antibacterial ions; organic matter carried by aerosols is decomposed into CO2 and H2O in the photocatalytic layer, and precious metal doping increases the quantum efficiency to 69%. When operating at 25°C, 60% relative humidity, and a wind speed of 30cm / s, the virus inactivation rate reaches 99.99% within 1 hour.

[0060] Example 3

[0061] The HEPA filter was placed in a silver solution consisting of silver nitrate, polyethylene glycol 900, hydrazine hydrate solution and distilled water, with the mass ratio of silver nitrate, polyethylene glycol 1000 and hydrazine hydrate solution being 3.5:5:14, the mass volume ratio of silver nitrate and distilled water being 3.5 g:100 mL, the mass fraction of hydrazine hydrate solution being 11%, and the reaction was carried out at 65°C for 2 hours, and then the HEPA filter was dried at 40°C for 5 hours to obtain a filter with double-sided nanosilver loading (the particle size of the nanosilver was 20-30 nm, and the loading thickness of the nanosilver on one side was 0.1 mm).

[0062] Nano-TiO2, zinc nitrate and distilled water were ultrasonically dispersed at a power of 300W for 18 minutes to obtain a dispersion, and the dispersion was mixed with a NaOH solution to obtain a mixed solution. The mass ratio of nano-TiO2 and zinc nitrate was 1:6.5, the mass volume ratio of nano-TiO2, distilled water and NaOH solution was 1g:100mL:32mL, and the mass fraction of NaOH solution was 5%; the metal titanium mesh was immersed in the mixed solution and reacted at 90°C for 2 hours to obtain a titanium mesh containing a TiO2-ZnO array.

[0063] The precious metal solution consists of chloroplatinic acid solution, palladium chloride solution and silver nitrate solution. The concentration of the chloroplatinic acid solution is 7 g / L, the concentration of the palladium chloride solution is 5.5 g / L, and the concentration of the silver nitrate solution is 12 g / L. In the precious metal solution, the molar ratio of platinum, palladium and silver is 1:1.1:2.8. The titanium mesh containing the TiO2-ZnO array is immersed in the precious metal solution for 5 minutes and then dried and calcined in sequence. The drying temperature is 200°C and the time is 4.5 hours. The calcination temperature is 530°C and the time is 3.5 hours to obtain a titanium mesh with precious metal-doped photocatalytic arrays on the upper and lower surfaces (the single-sided thickness of the precious metal-doped photocatalytic array is 0.21 mm).

[0064] The carbon fiber cloth was completely immersed in a nickel-cobalt solution composed of nickel acetate, cobalt acetate, hydrazine hydrate and distilled water (the total molar concentration of nickel ions and cobalt ions was 0.12 mol / L, the molar ratio of nickel ions to cobalt ions was 1:1.1, and the volume ratio of hydrazine hydrate to distilled water was 1:3). The reaction was carried out under closed conditions at 220°C for 10 hours. The reaction product was dried at 95°C for 6 hours and then heat-treated at 340°C in a nitrogen atmosphere for 1 hour to obtain an ozone decomposition catalyst.

[0065] The polluted air passes through the double-sided nanosilver-loaded filter, the precious metal-doped photocatalytic array, the ultraviolet lamp, the precious metal-doped photocatalytic array, the double-sided nanosilver-loaded filter, and the ozone decomposition catalyst in sequence to obtain clean air.

[0066] In the device of this embodiment, the silver ion release rate is 0.1 μg / cm2·h; the specific surface area of ​​the precious metal-doped photocatalytic array is 150 m2 / g; the light intensity distribution uniformity of the ozone decomposition catalyst reaches 90%; when the device is in operation, the HEPA layer intercepts 99.97% of particles larger than 0.3 μm, and the nanosilver continuously releases antibacterial ions; organic matter carried by the aerosol is decomposed into CO2 and H2O in the photocatalytic layer, and the precious metal doping increases the quantum efficiency to 68%. When operated at 25°C, 60% relative humidity, and a wind speed of 30 cm / s, the virus inactivation rate reaches 99.99% within 1 hour.

[0067] Comparative Example 1

[0068] The double-sided nanosilver-loaded filter in Example 1 is omitted, and other conditions are the same as in Example 1. The polluted air passes through the noble metal-doped photocatalytic array, the ultraviolet lamp, the noble metal-doped photocatalytic array, and the ozone decomposition catalyst in sequence to obtain clean air.

[0069] When the device of this comparative example is operated at 25° C., 60% relative humidity, and 30 cm / s wind speed, the virus inactivation rate is 58% within 1 hour.

[0070] Comparative Example 2

[0071] The noble metal doped photocatalytic array of Example 1 is omitted, and other conditions are the same as those of Example 1. The polluted air passes through the filter with double-sided nanosilver loading, the ultraviolet lamp, the filter with double-sided nanosilver loading, and the ozone decomposition catalyst in sequence to obtain clean air.

[0072] When the device of this comparative example is operated at 25° C., 60% relative humidity, and 30 cm / s wind speed, the virus inactivation rate is 71% within 1 hour.

[0073] Comparative Example 3

[0074] The noble metal solution in Example 1 was omitted, the photocatalytic array was not doped with noble metals, and other conditions were the same as in Example 1.

[0075] When the device of this comparative example is operated at 25° C., 60% relative humidity, and 30 cm / s wind speed, the virus inactivation rate is 83% within 1 hour.

[0076] The devices prepared in Examples 1 to 3 are designed with regular hexagonal units, and have a drag coefficient of ≤35Pa. They are suitable for various closed circulation systems, especially for vehicle air conditioners, central air conditioners, etc. The devices described in Examples 1 to 3 are used in central air conditioners. 3 Testing in a closed space revealed that Examples 1-3 achieved 99.9%, 99.8%, and 99.8% H1N1 virus killing efficiencies, respectively, within 15 minutes. TVOC (total volatile organic compound) removal rates were 99.5%, 99.2%, and 99%, respectively. Furthermore, after 2000 hours of continuous operation, performance degradation was 4.5%, 5%, and 5%, respectively. The device of the present invention is suitable for closed circulation systems such as vehicle air conditioners and central air conditioners, and offers the advantages of high sterilization efficiency, long-term stability, and low energy consumption.

[0077] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A multi-factor collaborative air disinfection device, characterized in that: The multi-factor synergistic air disinfection device includes a filter with double-sided nanosilver loading, a precious metal-doped photocatalytic array, and an ozone decomposition catalyst; in the precious metal-doped photocatalytic array, the precious metals include platinum, palladium and silver, and the photocatalytic array is a TiO2-ZnO array.

2. The multi-factor coordinated air disinfection device according to claim 1, characterized in that: The polluted air passes through the double-sided nanosilver-loaded filter, the precious metal-doped photocatalytic array, the ultraviolet lamp, the precious metal-doped photocatalytic array, the double-sided nanosilver-loaded filter, and the ozone decomposition catalyst in sequence to obtain clean air.

3. The method for preparing the multi-factor synergistic air disinfection device according to claim 1 or 2, characterized in that: The following steps are included: 1) placing the filter in a silver solution for reaction and then drying to obtain a filter loaded with nanosilver on both sides; 2) Ultrasonic dispersion of nano-TiO2, zinc nitrate, and water to obtain a dispersion, and placing the titanium mesh in a mixture of the dispersion and a NaOH solution to react to obtain a titanium mesh containing a TiO2-ZnO array; 3) immersing the titanium mesh containing the TiO2-ZnO array in a noble metal solution, followed by drying and calcining to obtain a noble metal-doped photocatalytic array; 4) The carbon fibers are placed in a nickel-cobalt solution, reacted under closed conditions, and then dried and heat-treated to obtain an ozone decomposition catalyst.

4. The preparation method according to claim 3, characterized in that Step 1) The silver solution comprises silver nitrate, polyethylene glycol, hydrazine hydrate solution and water; the mass ratio of silver nitrate, polyethylene glycol and hydrazine hydrate solution is 2-4:5:8-16, the mass fraction of hydrazine hydrate solution is 8-12%, and the mass volume ratio of silver nitrate and water is 2-4g:100mL; the reaction temperature is 50-70°C, and the reaction time is 2-3h.

5. The preparation method according to claim 3 or 4, characterized in that Step 2) The mass ratio of nano-TiO2 and zinc nitrate is 1:5-7, and the volume mass ratio of NaOH solution to nano-TiO2 is 30-40 mL:1 g; the ultrasonic dispersion time is 10-20 min, the reaction temperature is 80-90° C., and the reaction time is 2-3 h.

6. The preparation method according to claim 5, characterized in that Step 3) The noble metal solution comprises a chloroplatinic acid solution, a palladium chloride solution, and a silver nitrate solution; the concentration of the chloroplatinic acid solution is 7 to 10 g / L, the concentration of the palladium chloride solution is 4 to 6 g / L, and the concentration of the silver nitrate solution is 10 to 18 g / L; and the molar ratio of platinum, palladium, and silver in the noble metal solution is 1:0.8 to 1.2:2.5 to 3.

5.

7. The preparation method according to claim 6, characterized in that Step 3) The impregnation time is 3 to 5 minutes, the drying temperature is 150 to 200° C., the drying time is 4 to 6 hours, the calcination temperature is 450 to 550° C., and the calcination time is 3 to 5 hours.

8. The preparation method according to claim 6 or 7, characterized in that Step 4) The nickel-cobalt solution comprises a soluble nickel salt, a soluble cobalt salt, hydrazine hydrate and water, wherein the soluble nickel salt is nickel nitrate, nickel chloride or nickel acetate, and the soluble cobalt salt is cobalt nitrate, cobalt chloride or cobalt acetate. In the nickel-cobalt solution, the molar ratio of nickel ions to cobalt ions is 0.8-1.2:0.8-1.2, the total molar concentration of nickel ions and cobalt ions is 0.08-0.15 mol / L, and the volume ratio of hydrazine hydrate to water is 1:2-4.

9. The preparation method according to claim 8, characterized in that Step 4) The reaction temperature is 180-220° C., the reaction time is 8-15 h, the drying temperature is 80-100° C., the drying time is 5-8 h, the heat treatment temperature is 300-350° C., the heat treatment time is 0.5-1.5 h, and the heat treatment is carried out under a protective atmosphere.

10. Use of the multi-factor synergistic air disinfection device according to claim 1 or 2 in a closed circulation system.

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