CN115429925A - Air sterilizing and purifying device - Google Patents
Air sterilizing and purifying device Download PDFInfo
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- CN115429925A CN115429925A CN202211213776.2A CN202211213776A CN115429925A CN 115429925 A CN115429925 A CN 115429925A CN 202211213776 A CN202211213776 A CN 202211213776A CN 115429925 A CN115429925 A CN 115429925A
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Images
Classifications
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
- A61L9/00—Disinfection, sterilisation or deodorisation of air
- A61L9/16—Disinfection, sterilisation or deodorisation of air using physical phenomena
- A61L9/18—Radiation
- A61L9/20—Ultra-violet radiation
- A61L9/205—Ultra-violet radiation using a photocatalyst or photosensitiser
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F8/00—Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying
- F24F8/20—Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying by sterilisation
- F24F8/22—Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying by sterilisation using UV light
Abstract
The application relates to air disappears and kills the purification technical field, especially an air disappears and kills purifier, includes: the electron emitter comprises a discharge electrode and is used for constructing a corona area filled with free electrons; a conductive element in current communication with the corona region; the light source can emit light containing UVA wave band outwards; and the conductive element can form a conduction band with the electron energy level higher than that of the photocatalyst layer, so that the conductive element can inject electrons generated by the electron emitter into the photocatalyst layer. The air sterilizing and purifying device provided by the invention combines a photocatalysis technology and an anion technology, generates electrons through the electron emitter, injects the electrons into the photocatalyst layer through the conductive element, and irradiates the photocatalyst layer through the UVA light source to generate a large amount of free radicals with strong oxidizing property, and utilizes the free radicals to sterilize and purify various dirty microorganisms and pollution sources in the air.
Description
Technical Field
The invention relates to the technical field related to air purification, in particular to an air sterilizing and purifying device.
Background
Airborne transmission of microorganisms is the primary transmission pathway for various respiratory diseases (e.g., influenza, pertussis, etc.). The air sterilizing and purifying device can kill bacteria and viruses suspended in the air and effectively inhibit the spread of respiratory diseases.
The traditional air sterilization and purification method mainly comprises two methods of ultraviolet light sterilization and negative ion purification. Ultraviolet sterilization generally adopts ultraviolet light in a UVC (200-290 nm) wave band to sterilize microorganisms, but UVC light sources have the defects of high heat generation, ozone generation, fatal harm to human bodies in leakage and the like.
Chinese utility model patent No. CN1795930A provides an air sterilizer using a negative ion purification technology, which can generate electrons having negative charges by using an electrostatic electron emission technology and perform air purification. The electrons can interact with oxygen in the air, particles suspended in the air, or odorous molecules and form negative ions. Through mutual attraction, collision and neutralization between positive ions and negative ions, neutral molecular groups are formed and sink to the ground, so that the effects of dust fall, deodorization and purification on air are achieved.
However, the anion killing technique has the following disadvantages: firstly, when the negative ions are combined with dust particles in the air to cause the dust particles to settle, the killing effect on microorganisms is lost; secondly, the generation of negative electrons needs corona generation formed by high-voltage (18 kV-28 kV) point discharge, the high-voltage electron emission technology has certain potential safety hazard, and ozone is generated to harm the safety of human bodies; third, the negative ions are highly reactive and quickly neutralized and quenched in the air, so that high concentrations of electrons or negative ions are mainly concentrated in the corona region, and the concentration of negative ions decreases linearly away from the corona region, which limits the range of air purifiable by the air sterilizer to some extent.
Disclosure of Invention
Aiming at the defects of the ultraviolet light sterilization method and the negative ion purification method, the invention aims to provide a novel air sterilization and purification device.
In order to achieve the purpose of the invention, the invention adopts the following technical scheme: an air disinfecting and purifying device, which is characterized by comprising: the electron emitter comprises a discharge electrode and is used for constructing a corona area filled with free electrons;
a conductive element in electronic communication with said corona region to receive free electrons therefrom;
the light source can emit light comprising UVA wave band outwards;
and a photocatalyst layer attached to a surface of the conductive member, the photocatalyst layer being a semiconductor material layer, and the conductive member having an electron energy level higher than a conduction band of the photocatalyst layer, so that the conductive member can inject free electrons generated from the electron emitter into the photocatalyst layer and form an electron enrichment in the photocatalyst layer.
In the above technical solution, preferably, the conductive element includes a substrate and a conductive layer formed on the substrate.
In one embodiment of the present application, the substrate is an insulating material, and the substrate is made of one or more materials selected from organic plastics, ceramics, glass, and wood.
In one embodiment of the present application, the substrate is made of a conductive material, and the substrate is made of one or a combination of two or more of aluminum, iron, magnesium, copper, zinc, chromium, nickel, titanium, carbon and chromium.
In the above technical solution, it is further preferable that the conductive layer is located between the substrate and the photocatalyst layer, and the conductive layer is formed by using one or a combination of two or more of graphite, graphene, platinum, silver, and gold.
In another embodiment of the present application, the conductive element is made of one or more of aluminum, iron, magnesium, copper, zinc, chromium, nickel, titanium, carbon, chromium, ITO, and FTO.
In the above technical solution, preferably, the photocatalyst layer is TiO 2 、ZnO、WO 3 、Fe 2 O 3 、C 3 N 4 Or BiOX, wherein X is a halogen element.
In the above technical solution, preferably, the photocatalyst layer is made of a nano-scale microcrystalline material capable of adsorbing active carbon, diatomaceous earth or molecular sieve, and the amount of the active photocatalyst in the photocatalyst layer is 0.2-50g/m 2 。
In the above technical solution, preferably, the electron emitter further includes an electron accepting electrode, and the electron accepting electrode and the conductive element form an electron flow.
In the above preferred embodiment, it is further preferred that the electron accepting electrode is made of a metal wire or a carbon conductive material.
In the above preferred embodiment, the electron emitter further comprises a conductive pin, and the conductive pin is connected between the electron receiver and the conductive element.
In the above technical solution, preferably, the photocatalytic layer is at least partially disposed in the corona region.
In the above technical solution, preferably, the output voltage of the electron emitter is less than 10KV, and the operating power is less than 5W.
In the above technical solution, preferably, photon energy of the light source is greater than a forbidden band of the photocatalyst layer.
In the above technical solution, preferably, the wavelength band of the light source is 340-390nm.
Compared with the prior art, the air sterilizing and purifying device provided by the technical scheme of the invention generates electrons through the electron emitter, injects the electrons into the photocatalyst layer through the conductive element, and irradiates the photocatalyst layer through the UVA light source, so that the photocatalysis enhanced synergistic effect is realized, a large amount of free radicals with strong oxidizing property are generated, and the free radicals are utilized to achieve the effects of sterilizing and purifying various dirt microorganisms and pollution sources in the air, and the air sterilizing and purifying device has the advantages of safety and high efficiency.
Drawings
FIG. 1 is a schematic view of an air sterilizer according to the present invention;
FIG. 2 is a diagram of a formaldehyde testing apparatus provided in the present invention;
FIG. 3 is a diagram illustrating the charge distribution in the corona region of an electron emitter according to embodiment 1 of the present invention.
Wherein:
100. an air sterilizing and purifying device;
1. an electron emitter; 12. a conductive pin; 13. an electron-accepting electrode;
2. a conductive element; 21. a substrate; 22. a conductive layer;
3. a light source; 4. a photocatalyst layer;
10. a polyformaldehyde decomposition device; 20. a stainless steel experiment box; 201. a fan; 30. a concentration monitoring device;
1', an electron emitter; 21', a base; 22', a conductive layer; 3', a light source; 4' and a photocatalyst layer.
Detailed Description
In order to explain the technical content, the structural features, the achieved objects and the effects of the present application in detail, the technical solutions in the embodiments of the present application will be described below with reference to the accompanying drawings in the embodiments of the present application.
The invention provides an air sterilizing and purifying device which can be arranged in a sterilizing unit, a refrigerator or an air conditioner to sterilize microorganisms in the air and purify various pollution sources in the air. As shown in fig. 1, the air disinfecting and purifying device 100 provided by the present invention comprises an electron emitter 1 capable of emitting electrons outwards, a conductive element 2 in electron flow communication with the electron emitter 1, a light source 3 capable of emitting light in UVA (315-400 nm) band outwards, and a photocatalyst layer 4 attached to one side surface of the conductive element 2.
The electron emitter 1 includes a discharge electrode 11 that can discharge free electrons to the outside, a number of conductive pins 12 arranged at the discharge electrode 11, and an electron acceptance electrode 13 that electrically connects all the conductive pins 12 at the same time. The electron emitter 1 is configured to operate at a voltage of less than 30KV and at a power of less than 10W. Preferably, the operating voltage of the electron emitter 1 is less than 10KV and the operating power is less than 5W, where the electron emitter operating at low power does not generate harmful substances such as ozone and does not generate corona effect to human body.
The discharge electrode 11 is used to build a corona region filled with free electrons. The conductive pin 12 is arranged in the corona region to absorb free electrons in the corona region by means of a tip-focusing effect of the electrons. In practical use, the corona region formed by the discharge electrode 11 can be measured by a negative ion detector to determine the distribution concentration of free electrons, and then the conductive needle 12 is arranged according to the distribution concentration. It can be understood that by controlling the distance between the discharge electrode 11 and the conductive needle 12, the amount of free electrons entering the conductive layer 22 (see below) can be controlled, and thus the sterilization and purification efficiency of the air sterilization and purification device 100 as a whole can be controlled.
The electron-receiving electrode 13 is electrically connected to a conductive layer 22 (see below) of the conductive element 2 to transfer free electrons received by the conductive pin 12 to the conductive element 2. The electron accepting electrode 13 can be made of metal or carbon conductive material, and the metal material can be one or more of precious metals such as platinum, silver, gold and the like; the carbon conductive material can be 2D carbon graphite or/and carbon fiber. In other embodiments, the conductive pin and electron accepting electrode may be eliminated and the conductive element disposed directly within the corona region to accommodate a compact operating environment (e.g., the interior of a refrigerator or air conditioner).
The conductive element 2 is used to receive free electrons from the electron emitter 1 and inject the free electrons into the photocatalyst layer 4. The conductive member 2 includes a substrate 21 and a conductive layer 22 disposed on one side surface of the substrate 21. The substrate 21 may be made of a conductive material or a non-conductive material. When a conductive material is selected, the conductive material may be selected from one of the following or a metal alloy consisting of at least two of the following: aluminum, iron, magnesium, copper, zinc, chromium, nickel, titanium, carbon, chromium. When non-conductive materials are selected, one or more of the following may be selected: organic plastics, ceramics, glass, and wood.
The conductive layer 22 is a continuous coating made of a metal material, a carbon material or a semiconductor material, and the carbon material coating can be made of graphene; the metal material can be selected from one or more of the following materials: platinum, silver, gold, and other noble metals; the semiconductor material can be ITO or FTO. In other embodiments, the conductive layer may also be provided with a three-dimensional structure (e.g., a three-dimensional honeycomb structure) to further increase the area of the photocatalyst layer and improve the air fluidity of the photocatalyst layer, which is particularly suitable for use in a narrow space; in other embodiments, if the substrate of the conductive element is made of the materials suitable for the conductive layer, the substrate can directly serve as the conductive layer.
The photocatalyst layer 4 is coated on the outer surface of the conductive layer 22, which is a semiconductor coating layer. The material of the photocatalyst layer may be selected from one or more of the following materials: tiO 2 2 、ZnO、WO 3 、 Fe 2 O 3 、C 3 N 4 And BiOX (X is a halogen element including Cl, br, and I). Furthermore, the photocatalyst layer material is a nano-crystalline micro-material which can be adsorbed on porous materials such as active carbon, diatomite, molecular sieve and the like to increase the adsorption area and improve the photocatalytic activity. Specifically, the photocatalyst layer is uniformly coated on the outer side of the conductive layer 22 of the conductive element 2 by a photocatalytic material, and the amount of the active photocatalytic material is 0.2-50g/m 2 Preferably 1 to 10g/m 2 。
The free electrons originating from the electron emitter 1 can resonate with the surface plasmon state of the nanoparticles on the coating surface of the conductive layer 22 and form a higher energy level (see below in detail), and the energy level of at least a part of the free electrons after resonance is higher than the conduction band of the semiconductor material employed for the photocatalyst layer 4, so that the part of the free electrons can be injected into the photocatalyst layer 4. The free electrons entering the photocatalyst layer 4 react with oxygen and water adsorbed by the photocatalyst layer 4 to generate strong oxidizing radicals, which kill microorganisms (including bacteria and viruses) in the air and purify various pollution sources (including formaldehyde, VOCs, and nitrogen oxides) in the air.
A light source 3 is directed towards the photocatalyst layer 4, the light source 3 being configured to generate photon energy greater than the forbidden band of the semiconductor material chosen for the photocatalyst layer 4. With TiO as a carrier 2 Photocatalytic material, for example, tiO 2 The forbidden band width of (A) is 3.2 eV, and the corresponding wavelength is 389 nm. Therefore, the light source 3 should be selected to be ultraviolet light with energy higher than 389 nm. In particular, the light source 3 is configured to be able to be produced on the surface of the photocatalytic coating 4Green strength of 0.05-10 mW/cm 2 The intensity of the light radiation of (2) may be further preferably 0.2 to 4 mW/cm 2 。
Compared with UVC light source, the low-energy UVA light source is more friendly to human body and environment, but does not have effective virus killing capability. Irradiating a semiconductor photocatalytic material (e.g. TiO) by UVA 2 ) The compound photocatalyst can generate negatively charged electrons and positively charged holes, and the electrons and the holes can form free radicals with strong oxidizing property with water and oxygen adsorbed on the surface of the photocatalytic material, and the free radicals have effective killing and purifying effects on various pollution sources (such as formaldehyde, VOCs, oxynitride, bacteria and the like) in the air. However, the surface mobility rate of photo-generated charges is slow, which causes the recombination of electrons and holes, so that the yield of the photocatalysis quantum is very low, and the air sterilization and purification effects cannot be well achieved.
The metal nano particles are used as a cocatalyst, so that the photocatalytic performance can be effectively improved. It has been found that metal nanoparticles (including Au, ag, cu, pt, rh, pd, mg, N, al, etc.) can generate localized surface plasmons on the surface. The surface plasmon states can form electron levels in different wavelength bands, facilitating absorption of light including ultraviolet to infrared. The surface plasma state can also enhance a local electric field to form an internal electric field, which is beneficial to the transmission and separation of electric charges, thereby improving the photocatalysis efficiency. The formation of different electron levels means that the metal nanoparticles can simultaneously act as electron acceptors or electron donors. High energy levels are filled with electrons when there are a large number of free electrons, and therefore they can inject electrons into the conduction band of the photocatalytic semiconductor.
The injection of a large number of external electrons can play two roles: 1. forming an electric field to facilitate separation of photo-generated charges; 2. the injected electrons can replenish electrons lost due to recombination effects and improve the yield of photo-generated quanta. The air sterilizing and purifying device 100 provided by the invention realizes the photocatalysis enhancement synergistic effect by the two factors, thereby enhancing the air sterilizing and purifying capacity.
To further illustrate the operation of the air sterilizer 100 of the present invention, the present invention provides a formaldehyde test and a sterilization rate test.
(1) Formaldehyde testing
Fig. 2 shows the test equipment for formaldehyde test provided by the present invention and the air sterilizing and purifying device 100' provided in example 1. The test equipment comprises a polyformaldehyde decomposition device 10 for producing formaldehyde, a stainless steel experiment box (a barrel body with the diameter of 30cm and the height of 30 cm) 20 with a small fan 201 arranged at the bottom, and a concentration monitoring device 30 for collecting the concentration of formaldehyde.
The formaldehyde used in the test is generated by heating and decomposing the paraformaldehyde solution in the flask of the polyformaldehyde decomposing device 10, and the generated formaldehyde is directly introduced into the stainless steel experimental box 20. A small fan 201 at the bottom of the stainless steel laboratory box 20 was used to circulate the internal gas flow. The concentration detection device 30 comprises an electrochemical formaldehyde sensor (measuring range 0-2 mg/m) arranged inside the stainless steel experimental box 20 3 Not shown in the figure) to monitor the formaldehyde concentration in the stainless steel laboratory box 20. Because some devices of the test environment are colloidal products, the concentration of formaldehyde in the stainless steel experimental box 20 is ensured to be less than 0.03mg/m before each experiment 3 . During each experiment, formaldehyde was injected into the stainless steel laboratory box 20 to maintain the formaldehyde concentration at 1mg/m 3 And then the aldehyde removal test is performed.
The test provides the test results (table 1) of example 1 and comparative examples 1 to 6 below and example 1 and comparative examples 1 to 6, respectively, on the above-described test equipment to illustrate the air-sterilizing effect of example 1.
Example 1: the base 21 'of the conductive element 2' of the air sterilizing and purifying device is an aluminum alloy plate with a polished surface. A carbon graphene layer with a thickness of about 5nm is coated on the surface of the substrate 21 'as the conductive layer 22' by a vacuum sputtering method. Graphene is a superior electron conductor, and electron acceptor. A large amount of electrons are concentrated in the graphene conducting layer, so that the high-energy-level energy band is filled with the electrons, and a photocatalytic conduction band can be injected. The light source 3' adopts 365nm ultraviolet LED light source, and the illumination intensity is 0.5mW/cm 2 . The electron emitter 1' is selected from NC-6KA, converted into DC voltage of 5.5 kV, generated by the electron emitter 1The negative ion concentration (i.e., charge concentration) in the corona region is shown in figure 3 of the specification. The photocatalyst layer 4' is made of TiO 2 Prepared by the method, the total spraying area is 100cm 2 The spraying amount is 2g/m 2 . Because of the limited testing space, the present embodiment does not have an electron acceptor, but the photocatalyst layer 4' is directly placed in the corona region of 20-50cm, and the electron concentration is in the range of 1 × 10 6 -10×10 6 /cm 3 In the region of (3), the conductive layer 22 'is then directly electrically connected to the emitter of the electron emitter 1', so that the conductive layer 22 'is able to inject directly received free electrons into the photocatalytic coating 4'.
Comparative example 1: no device with air sterilizing or purifying function is arranged;
comparative example 2: only set up by TiO 2 A photocatalyst layer and a conductive element made of materials (no electron emitter and no light source are provided);
comparative example 3: only arranged by TiO 2 Photocatalyst layer made of material, conductive element and 365nm ultraviolet LED light source (no electron emitter is arranged);
comparative example 4: only an electron emitter of model No. NC-6KA (no conductive element, no light source, and no photocatalyst layer) was provided;
comparative example 5: the light source in example 1 was left out of setup or turned off during the experiment, the rest being identical to example 1;
comparative example 6: the conductive member was not provided with a conductive layer, and the rest was the same as in example 1.
Table 1:
| aldehyde removal test | Example 1 | Comparative example 1 | Comparative example 2 | Comparative example 3 | | Comparative example 5 | Comparative example 6 |
| Speed mg/min | 0.26 | 0.002 | 0.002 | 0.067 | 0.01 | 0.03 | 0.1 |
As can be seen from Table 1 above, the natural attenuation of formaldehyde (comparative example 1) was 0.002mg/min; comparative example 2 the test results are the same as in comparative example 1, i.e. the test results are illustrated for a material made of TiO 2 The prepared photocatalyst layer has no activity under the conditions of no illumination and no free electron injection; as can be seen from comparative example 3, the material formed by TiO 2 After the prepared photocatalyst layer is irradiated by an ultraviolet LED light source, the aldehyde removal efficiency is obviously improved; the aldehyde removal efficiency of the electron generator itself (comparative example 4) was only 0.01mg/min; the aldehyde removal efficiency of comparative example 5 was increased by 15 times as compared to that of comparative example 2, which indicates that the aldehyde removal efficiency can be significantly improved by injecting electrons into the photocatalyst layer; the comparative example 6, in which the aldehyde removal efficiency was 0.1mg/min, was higher than that of comparative examples 3 and 5, demonstrates that the simultaneous injection of free electrons into the photocatalytic layer and the application of light can produce a photocatalytic enhancement synergistic effect and improve the aldehyde removal effect; example 1 further improved the aldehyde removal efficiency compared to comparative example 6, demonstrating that the amount of free electrons injected into the photocatalytic layer had a significant positive correlation to its aldehyde removal efficiency.
Further, in order to illustrate the difference in aldehyde removal efficiency between the air sterilizer using the conductive layers of different materials, the test also provided the test results of examples 2 to 6 and examples 1 to 6 in the above test apparatuses, respectively (table 2).
Example 2: a conductive layer made of platinum metal, the remainder being the same as in example 1;
example 3: a conductive layer made of metal gold, the remainder being the same as in example 1;
example 4: a conductive layer made of metallic silver was used, and the rest was the same as in example 1;
example 5: a conductive layer made of metallic copper was used, and the remainder was the same as in example 1;
example 6: a conductive layer made of metallic aluminum was used, and the rest was the same as in example 1.
Table 2:
| aldehyde removal test | Example 1 | Example 2 | Example 3 | Example 4 | Example 5 | Example 6 |
| Speed mg/min | 0.26 | 0.45 | 0.36 | 0.32 | 0.22 | 0.12 |
As can be seen from Table 2 above, the pair of conductive layers made of a platinum metal (example 2) is made of TiO 2 The aldehyde removal efficiency of the prepared photocatalyst layer has the highest promotion effect, the aldehyde removal rate is 0.45 mg/min, and compared with the comparative example 3, the aldehyde removal efficiency of the photocatalyst layer is promoted by nearly 15 times; according to the effect of improving the aldehyde removal efficiency of the photocatalytic layer, the different materials are sorted into platinum>Gold (Au)>Silver (Ag)>Carbon (C)>Copper (Cu)>Aluminum; the conductive layer made of the metallic aluminum material had the weakest effect of removing aldehyde from the photocatalyst layer, and the aldehyde removal rate was 0.12 mg/min, which is equivalent to the effect of comparative example 4. The possible reason is that Al is easily oxidized to form Al on the surface 2 O 3 An insulator, which attenuates or shields the formation of plasma states, results in poor electron injection capability.
(2) Sterilization Rate test
The test method comprises the following steps: placing the sample inEntering space is 3m 3 In the experimental cabinet, under the conditions of normal temperature and normal pressure, escherichia coli and Staphylococcus aureus are used as test bacteria, and the total number of bacteria in the air is 2 multiplied by 10 6 cfu/m 3 . Samples are sampled after working for 2 hours, and then the experimental group and the comparison group are compared to obtain the bacterial killing rate.
To avoid redundancy, the examples and comparative examples provided in this test correspond to those in the above aldehyde removal test, and the test results are shown in tables 3 and 4 below.
TABLE 3
| Processing time/hour | Sample(s) | Testing microorganisms | Total number of bacteria in air (cfu/m) 3 ） | Percent kill (%) | Log (kill rate) |
| 0 | Reference device | Escherichia coli | 2×10 6 | ||
| 2 | Comparative example 3 | | 4×10 5 | 80 | 0.70 |
| 2 | Comparative example 4 | Escherichia coli | 2.4×10 3 | 99.88 | 2.92 |
| 2 | Example 1 | Escherichia coli | 8.0×10 2 | 99.96 | 3.40 |
| 2 | Example 2 | Escherichia coli | 9.0×10 2 | 99.96 | 3.40 |
| 2 | Example 4 | | 2×10 2 | 99.99 | 4.00 |
TABLE 4
| Processing time/hour | Sample (I) | Testing microorganisms | Total number of bacteria in air (cfu/m) 3 ） | Percent kill (%) | Log (kill rate) | |
| 0 | Reference | Staphylococcus aureus | 4×10 6 | |||
| 2 | Comparative example 3 | Staphylococcus aureus | 1×10 6 | 75 | 0.60 | |
| 2 | Comparative example 4 | Staphylococcus aureus (Staphylococcus aureus) | 1×10 5 | 97.5 | 1.60 | |
| 2 | Example 1 | Staphylococcus aureus | 2.0×10 3 | 99.95 | 3.30 | |
| 2 | Example 2 | Staphylococcus aureus | 1.8×10 3 | 99.96 | 3.40 | |
| 2 | Example 4 | Staphylococcus aureus | 5×10 2 | 99.99 | 4.00 |
As can be seen from tables 3 and 4 above, the compound is made of TiO 2 The prepared photocatalytic layer has the microbial killing rate of only about 0.7 under the irradiation of ultraviolet light in UVA wave band (comparative example 3); the killing rate of Escherichia coli and the killing rate of Staphylococcus aureus of an electron emitter with the model of NC-6KA are respectively 2.29log and 1.6log; the escherichia coli killing rate and the staphylococcus aureus killing rate of the air sterilizing and purifying device (embodiment 1, embodiment 2 and embodiment 4) are obviously higher than those of the escherichia coli killing rate and the staphylococcus aureus killing rate, wherein the embodiment 4 with silver as the conductive layer material has the highest escherichia coli killing rate and the highest staphylococcus aureus killing rate, and both the escherichia coli killing rate and the staphylococcus aureus killing rate reach 4.00 logs.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the foregoing description only for the purpose of illustrating the principles of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the invention as defined by the appended claims, specification, and equivalents thereof.
Claims (16)
1. An air sterilizing and purifying device, which is characterized in that the device comprises:
an electron emitter including a discharge electrode, said electron emitter configured to create a corona region filled with free electrons;
a conductive element in electronic communication with said corona region to receive free electrons therefrom;
the light source can emit light rays comprising UVA wave bands outwards;
and a photocatalyst layer attached to a surface of the conductive member, the photocatalyst layer being a semiconductor material layer, and the conductive member having an electron energy level higher than a conduction band of the photocatalyst layer, so that the conductive member can inject free electrons generated from the electron emitter into the photocatalyst layer and form an electron enrichment in the photocatalyst layer.
2. The air disinfecting and purifying device as claimed in claim 1, wherein: the conductive element includes a substrate and a conductive layer formed on the substrate.
3. The air disinfecting and purifying device as claimed in claim 2, characterized in that: the substrate is made of an insulating material, and the substrate is made of one or more of organic plastics, ceramics, glass and wood.
4. An air disinfecting and purifying device as claimed in claim 2, characterized in that: the substrate is made of a conductive material, and the material of the substrate is formed by one or more of aluminum, iron, magnesium, copper, zinc, chromium, nickel, titanium, carbon and chromium.
5. An air disinfecting and purifying device as claimed in claim 3 or 4, characterized in that: the conducting layer is positioned between the substrate and the photocatalyst layer and is formed by combining one or more than two of graphite, graphene, platinum, silver or gold.
6. The air disinfecting and purifying device as claimed in claim 1, wherein: the conductive element is made of one or more of aluminum, iron, magnesium, copper, zinc, chromium, nickel, titanium, carbon, chromium, ITO and FTO.
7. The air disinfecting and purifying device as claimed in claim 1, wherein: the photocatalyst layer is TiO 2 、ZnO、WO 3 、Fe 2 O 3 、C 3 N 4 Or BiOX, wherein X is a halogen element.
8. The air disinfecting and purifying device as claimed in claim 1, wherein: the photocatalyst layer is made of nano microcrystalline material capable of being adsorbed on active carbon, diatomite or molecular sieve, and the dosage of the active photocatalyst in the photocatalyst layer is 0.2-50g/m 2 。
9. The air disinfecting and purifying device as claimed in claim 1, wherein: the electron emitter further includes an electron acceptor in electronic communication with the conductive element.
10. The air disinfecting and purifying device as claimed in claim 9, wherein: the electron accepting electrode is made of metal wires or carbon conducting materials.
11. An air disinfecting and purifying device as recited in claim 9, characterized in that: the electron emitter further comprises a conductive pin connected between the electron receiving electrode and the conductive element.
12. An air disinfecting and purifying device as recited in claim 11, characterized in that: the conductive needle is located in the corona area.
13. The air disinfecting and purifying device as claimed in claim 1, wherein: the photocatalytic layer is at least partially disposed in the corona region.
14. The air disinfecting and purifying device as claimed in claim 1, wherein: the output voltage of the electronic transmitter is less than 10KV, and the working power is less than 5W.
15. The air disinfecting and purifying device as claimed in claim 1, wherein: the photon energy of the light source is larger than the forbidden band of the photocatalyst layer.
16. The air disinfecting and purifying device as recited in claim 1, wherein said light source has a wavelength of 340-390nm.
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| JP2007029827A (en) * | 2005-07-25 | 2007-02-08 | Toshiba Corp | Discharge type photocatalyst reactor and discharge type photocatalyst material |
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| JP2005199235A (en) * | 2004-01-19 | 2005-07-28 | Chonpun Co Ltd | Photoelectron catalytic purification apparatus and method for removing contaminant |
| JP2007029827A (en) * | 2005-07-25 | 2007-02-08 | Toshiba Corp | Discharge type photocatalyst reactor and discharge type photocatalyst material |
| CN112169582A (en) * | 2020-09-09 | 2021-01-05 | 中国船舶重工集团公司第七一八研究所 | High-voltage electric-assisted photocatalytic purification device with sterilization and odor purification functions |
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