CN115419974B - Air purifying and sterilizing method - Google Patents
Air purifying and sterilizing method Download PDFInfo
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- CN115419974B CN115419974B CN202211033269.0A CN202211033269A CN115419974B CN 115419974 B CN115419974 B CN 115419974B CN 202211033269 A CN202211033269 A CN 202211033269A CN 115419974 B CN115419974 B CN 115419974B
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- air
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- 229910010413 TiO 2 Inorganic materials 0.000 claims abstract description 37
- 239000000758 substrate Substances 0.000 claims abstract description 32
- 241000894006 Bacteria Species 0.000 claims abstract description 22
- 238000004659 sterilization and disinfection Methods 0.000 claims abstract description 16
- 238000004887 air purification Methods 0.000 claims abstract description 14
- 230000005855 radiation Effects 0.000 claims description 44
- 238000001035 drying Methods 0.000 claims description 17
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- 229910052760 oxygen Inorganic materials 0.000 claims description 14
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- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 11
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 claims description 11
- 239000001301 oxygen Substances 0.000 claims description 11
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F7/00—Ventilation
- F24F7/003—Ventilation in combination with air cleaning
-
- 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—Ultraviolet radiation
- A61L9/205—Ultraviolet radiation using a photocatalyst or photosensitiser
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
-
- 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
- F24F8/10—Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying by separation, e.g. by filtering
- F24F8/15—Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying by separation, e.g. by filtering by chemical means
- F24F8/167—Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying by separation, e.g. by filtering by chemical means using catalytic reactions
-
- 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
- F24F8/10—Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying by separation, e.g. by filtering
- F24F8/192—Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying by separation, e.g. by filtering by electrical means, e.g. by applying electrostatic fields or high voltages
-
- 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
-
- 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
- F24F8/24—Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying by sterilisation using sterilising media
-
- 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
- F24F8/30—Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying by ionisation
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The invention discloses an air purification and sterilization method, and belongs to the technical field of air pollution control. The air purification and sterilization method comprises the following steps: providing a back corona plasma unit to form plasma, wherein the back corona plasma unit is sequentially provided with a corona electrode, an auxiliary electrode, an integral VOCs catalyst and a grounding electrode in the airflow flowing direction, the integral VOCs catalyst comprises a honeycomb substrate and the VOCs catalyst coated on the inner surface and the outer surface of the honeycomb substrate, the inner surface and the outer surface of the honeycomb substrate comprise whiskers, and the active components of the integral VOCs catalyst comprise Ce-BiVO 4 ‑TiO 2 Ag; under the irradiation of visible light and/or ultraviolet light, the catalyst passes through Ce-BiVO 4 ‑TiO 2 Ag for treating VOCs and bacteria in the air; VOCs and bacteria in the air are treated with the active ingredients in the plasma. The air purification and sterilization method can efficiently treat VOCs and bacteria in the air, and reduce adverse effects caused by bad air.
Description
Technical Field
The embodiment of the invention relates to the technical field of air pollution control, in particular to an air purifying and sterilizing method.
Background
The quality of air is closely related to the quality of life of a person. Due to environmental influences, air (especially indoor air) contains bacteria such as staphylococcus aureus and escherichia coli, and bacterial infection is caused by the bacteria, so that death can be caused under severe infection. In addition, air (especially indoor air) also contains volatile organic compounds (VOC, volatile organic compounds). Most VOCs have three effects (carcinogenic, teratogenic, mutagenic), and their toxicity, persistence, and nondegradability are severely detrimental to human health and human survival space.
Disclosure of Invention
In order to solve at least one of the above problems and disadvantages of the prior art, embodiments of the present invention provide an air purifying and sterilizing method that desirably can sterilize air (especially, indoor air of a house, a workshop, etc.) and remove VOCs therein to improve living environment.
According to one aspect of the present invention, there is provided an air purifying and sterilizing method comprising:
providing a back corona plasma unit to form plasma, wherein the back corona plasma unit is sequentially provided with a corona electrode, an auxiliary electrode, an integral VOCs catalyst and a grounding electrode in the airflow flowing direction, the integral VOCs catalyst comprises a honeycomb substrate and the VOCs catalyst coated on the inner surface and the outer surface of the honeycomb substrate, the inner surface and the outer surface of the honeycomb substrate comprise whiskers, and the active components of the integral VOCs catalyst comprise Ce-BiVO 4 -TiO 2 /Ag；
Under the irradiation of visible light and/or ultraviolet light, the catalyst passes through Ce-BiVO 4 -TiO 2 Ag for treating VOCs and bacteria in the air;
VOCs and bacteria in the air are treated with the active ingredients in the plasma.
Other objects and advantages of the present invention will become apparent from the following description of embodiments of the present invention, which is to be read in connection with the accompanying drawings, and may assist in a comprehensive understanding of the present invention.
Drawings
These and/or other aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the preferred embodiments, taken in conjunction with the accompanying drawings, in which:
FIG. 1 illustrates an air cleaning device according to one embodiment of the present invention;
fig. 2 illustrates an air purification and sterilization method according to one embodiment of the present invention.
Detailed Description
The technical scheme of the invention is further specifically described below through examples and with reference to the accompanying drawings. In the specification, the same or similar reference numerals denote the same or similar components. The following description of embodiments of the present invention with reference to the accompanying drawings is intended to illustrate the general inventive concept and should not be taken as limiting the invention.
Furthermore, in the following detailed description, for purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of the embodiments of the present disclosure. It may be evident, however, that one or more embodiments may be practiced without these specific details.
In an embodiment of the present invention, an air cleaning device is provided to desirably sterilize bacteria in the air while removing VOCs in the air.
As shown in fig. 1, the air cleaning device 100 includes an air inlet 10, a back corona plasma unit 40, and an air outlet 60 in this order in the direction in which the air flow flows (in fig. 1, the air flow flows from left to right).
In one example, the air cleaning device 100 further includes a radiation unit 30 between the air inlet 10 and the back corona plasma unit 40.
In an example, the air cleaning device 100 further includes a filter unit 20 between the air inlet 10 and the radiation unit 30.
In one example, the air cleaning device 100 further includes a catalyst bed 50 between the back corona plasma unit 40 and the exhaust 60.
In use, air to be treated enters from the air inlet 10, passes sequentially through the filter unit 20 (if present), the radiation unit 30 (if present), the back corona plasma unit 40 and the catalyst bed 50 (if present), and finally exits the treated air from the air outlet 60.
The air inlet 10 and the air outlet 60 are provided at both ends of the air cleaning device 100 to allow air to be treated to enter and exit the air cleaning device 100. In the example of fig. 1, the air intake 10 is located at the left end of the air cleaning device 100, and the air exhaust 60 is located at the right end of the air cleaning device 100.
The filter unit 20 is configured to adsorb dust in the air to avoid the dust remaining in the air, thereby adversely affecting a human being such as an occupant or a worker in a factory building.
Further, as shown in fig. 1, the filter unit 20 includes a main body frame (not shown), an electrostatic net 22 located on the main body frame, and a filter 24 located within the main body frame. A filter 24 is arranged downstream of the electrostatic net 22 in the direction of airflow. In the example of fig. 1, the electrostatic mesh 22 is located on the front side of the filter unit 20 and the filter 24 is located on the rear side of the filter unit 20. In one example, the filter unit 20 further includes an interface to provide electrical power to the electrostatic mesh.
In one example, the main body frame is generally rectangular parallelepiped, including a hollow portion (e.g., in the form of a cuboid) in a lower portion thereof, where the filter 24 is located. The interface is located at the upper part of the main body frame. Embodiments of the present disclosure do not limit the specific shape of the main body frame nor the position and shape of the hollow portion, as long as the filter and the electrostatic net can be supported.
The main body frame (specifically, at a hollow portion thereof) includes opposite first and second opening sides. The first open side is closed by an electrostatic net 22. At least one mounting bar (not shown in the figures) is provided on the second open side for mounting the radiation unit 31. The mounting bar may be arranged perpendicular to the flow direction of the air flow to facilitate the air flow in the flow direction (left to right) and to facilitate the ultraviolet radiation unit 30 to form radiation rays parallel to the flow direction. Of course, the mounting bar may also be arranged obliquely with respect to the direction of flow of the air stream.
The electrostatic network 22 is connected (e.g., via an interface) to a negative dc high voltage power supply such that dust in the air is charged by the electrostatic network 22 to allow adsorption onto the following filter 24 (filter 24 grounded).
The filter 24 is formed by injection molding of superfine glass fiber filter paper, nylon wires and a plastic frame. In one example, the outer surface of the ultra fine glass fiber filter paper has a moisture resistant coating. The filter 24 is in the form of a V-pleated paper structure, which may be produced, for example, by a hot rolling process. The V-shaped pleated paper structure can ensure that the filtering area is fully utilized, and ensures that dust is uniformly distributed on the surface of the filter material, and meanwhile, the V-shaped pleated paper structure can play a role in guiding flow, so that the air flow is uniformly distributed, the pressure drop is slowly increased, the economy and the safety are realized, and the service life is long.
The radiation unit 30 comprises at least one ultraviolet light source. The ultraviolet light source emits first ultraviolet radiation. The wavelength of the first ultraviolet radiation may be selected to be 185nm, 222nm, 254nm, 308nm, etc., or a combination of several different wavelength UV light sources. The first ultraviolet radiation may be used to sterilize bacteria in the air. The first ultraviolet radiation may also act on the active ingredients of the monolithic VOCs to facilitate the purification of the air by the active ingredients.
Optionally, the radiation unit 30 further comprises at least one visible light source. The visible light source emits visible light of 400-700 nm. Visible light can act on the active ingredients of the monolithic VOCs to facilitate the purification of air by the active ingredients.
The ultraviolet light source and the visible light source are both positioned on the mounting plate. Embodiments of the present invention are not limited in the number of ultraviolet and visible light sources and may be set by those skilled in the art as desired. The ultraviolet light source and the visible light source may be disposed at one, two, three or more intervals from each other, or the visible light source may be disposed in the middle of the mounting plate, with the ultraviolet light source being disposed at both ends of the mounting plate. Embodiments of the present invention are not limited to the arrangement of the ultraviolet light source and the visible light source. In one example, the ultraviolet light source and the visible light source are disposed on the mounting plate toward the monolithic VOCs catalyst to facilitate more efficient reaction of the radiation emitted by the light source with the monolithic VOCs catalyst.
The back corona plasma unit 40 sequentially includes in the flow direction of the air flow: corona electrode 42, auxiliary electrode 44, monolithic VOCs catalyst 46 and ground electrode 48.
Corona electrode 42 is powered by a negative high voltage dc power supply. Corona electrode 42 causes the gas in the vicinity of corona electrode 42 to be ionized during the discharge process to create a substantial negative charge that can interact with monolithic VOCs catalyst 46 to form a back corona plasma. The corona electrode 42 may be made of tungsten wire having a diameter of between 2-6 mm.
The auxiliary electrode 44 suppresses the development of the corona electrode 42 discharge to the spark discharge. The auxiliary electrode 44 may be made of tungsten wire having a diameter of between 2-6 mm.
Monolithic VOCs catalyst 46 comprises a honeycomb substrate and VOCs catalyst coated on the inside and outside surfaces of the honeycomb substrate.
The honeycomb substrate has larger specific surface area, and can provide larger adhesion sites for VOCs catalyst coating. In one example, the honeycomb matrix of the monolithic VOCs catalyst 46 is cordierite, metal foam (nickel), alumina, or silicon carbide.
The inner and outer surfaces of the honeycomb substrate include whiskers. In one example, the whiskers include mullite whiskers, aluminum borate whiskers, or silicon carbide whiskers.
The active components of the monolithic VOCs catalyst 46 include Ce-BiVO 4 -TiO 2 Ag catalyst.
In one example, a method of preparing the monolithic VOCs catalyst comprises the steps of:
providing a honeycomb substrate with whiskers grown on the surface;
providing Ce-BiVO 4 -TiO 2 Ag catalyst;
the Ce-BiVO is processed according to a first mass ratio (e.g., (20-30): (15-20): (10-15): (30-45)) 4 -TiO 2 The Ag catalyst is mixed with sodium carboxymethyl cellulose, silica sol and water to obtain a first reactant, the first reactant is coated on the inner and outer surfaces of a honeycomb substrate growing whiskers, and the honeycomb substrate is dried and then baked (baked for 3-6 hours at 300-600 ℃) to obtain the monolithic VOCs catalyst.
Providing a honeycomb substrate having whiskers grown on a surface thereof comprises:
embedding the honeycomb substrate by whisker raw materials, anhydrous aluminum sulfate and anhydrous sodium sulfate to obtain a mixed material;
the mixture is calcined at 900-1200 deg.c (e.g., 1000 deg.c) for 2-12 hours (e.g., 8 hours) and then cooled, whereby whiskers are grown on the inner and outer surfaces of the honeycomb substrate.
In one example, ce-BiVO is provided 4 -TiO 2 The Ag catalyst comprises:
cerium source and bismuthThe source, vanadium source and citric acid form sol according to the second mass ratio, gel is formed after drying (such as in a constant temperature drying oven) at 80-100deg.C (such as 90deg.C), and active powder Ce-BiVO is obtained after roasting for 3-8 hr (such as 4-6 hr) at 300-500deg.C (such as 350-400deg.C) 4 ；
Active powder Ce-BiVO 4 Solution and TiO 2 Mixing according to a third mass ratio, reacting for 0.5-2 hours (e.g. 1-1.5 hours) under ultrasonic condition (e.g. under ultrasonic oscillation condition), drying (e.g. rotary drying) for 2-5 hours (e.g. 3-4 hours) at 60-100deg.C (e.g. 80-90deg.C), and calcining for 3-8 hours (e.g. 5-6 hours) at 300-500deg.C (e.g. 400-450deg.C) to obtain Ce-BiVO 4 -TiO 2 ；
Combining a silver source with Ce-BiVO 4 -TiO 2 Mixing according to a fourth mass ratio, adding a reducing agent (such as glycerol) into the mixed solution, drying (such as rotary drying) at 60-100deg.C (such as 80-90deg.C) for 2-5 hours (such as 3-4 hours), and calcining at 300-500deg.C (such as 400-450deg.C) for 3-8 hours (such as 5-6 hours) to obtain Ce-BiVO 4 -TiO 2 Ag catalyst.
The inventors of the present invention noted that TiO 2 The catalyst has a wider (specific, 3.2 eV) forbidden bandwidth, has low utilization rate to ultraviolet light and visible light, and has a lower photoresponse range; biVO (BiVO) 4 Can also be used as a photocatalytic material, but the utilization rate of the photocatalytic material to visible light and ultraviolet rays is relatively low, so that the TiO is limited 2 And BiVO 4 Application in photocatalysis. In view of this, the present invention proposes to mix TiO 2 And BiVO 4 The combination and ion doping (Ce and Ag) expand the photoresponse range and further improve the catalytic efficiency of the catalyst.
Specifically, cerium (Ce) ions are incorporated into BiVO 4 The internal composition of the catalyst is changed in the crystal structure of the catalyst, so that the electronic structure of the catalyst is changed, and the regulation and control of the energy band and the forbidden band width of the catalyst are realized, thereby improving the photocatalytic activity. Cerium (Ce) ions are considered to be relatively efficient dopants due to their unique 4f electron orbital configuration, and the results of the study indicate that in BiVO 4 In the crystal lattice, ce can be substituted for BiThe reason for inhibiting the recombination of photo-generated charges and improving the photo-catalytic activity is that the Ce doped BiVO 4 In the conditions of low Bi/V and rich O, ce Bi 1+ And Ce (Ce) V 1- Is a major defect and can be a p-type material, where Ce Bi 1+ The degradation activity is carried out at an unoccupied deep energy level, which is mainly composed of the 4f orbit of Ce and is a deep recombination center. For Ce V 1- Defects in Ce-BiVO 4 No localized states were found whose formation energy was sensitive to both chemical potential and fermi energy, indicating that Bi/V-lean and O-rich conditions favor elimination of deep energy states and improved photocatalytic performance. Thus, with Ce V 1- The doping process is established to BiVO 4 The intermediate doping of Ce can enhance the photocatalytic activity.
In TiO 2 And Ce-BiVO 4 When the optical response range is widened, lattice spacing is adjusted and crystal phase change is caused.
In the preparation process, ag is obtained in the roasting process + Is reduced to nano silver particles (AgNPs), thereby enabling Ce-BiVO 4 -TiO 2 The Ag catalyst has excellent photocatalytic performance. Specifically, the photocatalyst absorbs light energy under irradiation of radiation (such as ultraviolet radiation and visible radiation) with a certain wavelength, and when excited by energy larger than the forbidden band, electrons at the valence band position are excited and transition to the conduction band to form photogenerated electrons (e) - ) At the same time, holes (h + )。h + Has strong oxidizing property, e - Has reducibility, and can respectively perform oxidation-reduction reaction with water and oxygen to generate hydroxyl radical, superoxide anion, hydrogen peroxide and singlet oxygen. AgNPs can play a role of electron traps, and assist electron-hole separation and electron capture through the generation of a local electric field, so that the number of active species such as hydroxyl free radicals, superoxide anions, hydrogen peroxide, singlet oxygen and the like is increased, and the photocatalytic activity is enhanced. And the photo-generated electrons can collide with VOCs gas phase molecules to break chemical bonds to generate molecular fragments and other small molecular substances, therebyThe removal of VOCs in the air by utilizing the photocatalytic activity is realized.
Furthermore, agNPs also aid in air sterilization. Silver ions evolved by AgNPs can interact with thiol (-SH) groups of enzymes and biomacromolecules in bacterial bodies, causing their inactivation, thereby limiting bacterial growth. In addition, agNPs have a nanoeffect, i.e., they adhere to the cell wall and penetrate into bacterial cells, resulting in structural changes, leading to cell death, and allowing the hybrid membrane to function in dark conditions.
Further, the cerium source includes at least one of cerium acetate and its hydrate, cerium oxalate and its hydrate, cerium nitrate and its hydrate; the bismuth source comprises at least one of bismuth citrate, bismuth trichloride, bismuth nitrate and hydrates thereof; the vanadium source comprises at least one of vanadyl sulfate, vanadyl oxalate, vanadyl acetylacetonate, vanadyl chloride and vanadyl phosphate.
In embodiments using cerium acetate, bismuth citrate, and vanadyl oxalate, the second mass ratio is (10-15): (15-20): (5-10): (60-70), e.g., 12:18:8:62.
Further, the third mass ratio is (15-20): (80-85), such as 18:82. The fourth mass ratio is (10-20): (80-90), such as 15:85.
In an embodiment of the present invention, corona electrode 42 causes the gas in the vicinity of corona electrode 42 to be ionized during the discharge process to create a large negative charge and accumulate on the inner and outer surfaces of monolithic VOCs catalyst 46; the accumulated charges generate a superimposed electric field in the pores of the inner pore of the honeycomb substrate, and back corona plasma is generated when the field intensity of the superimposed electric field reaches or exceeds the breakdown field intensity of whiskers on the surfaces of the pores of the inner pore of the honeycomb substrate. The back corona plasma is generated in the pores inside the honeycomb matrix to form a plasma reaction channel, free electrons, high-energy ions and active particles generated in the plasma reaction channel are tightly combined with active components of the VOCs catalyst on the inner surface and the outer surface of the integral VOCs catalyst 46, so that the advantages of high reactivity of the plasma and high reactivity selectivity of the VOCs are fully exerted, the reactivity of the VOCs catalyst is activated, the reactivity of the back corona plasma is improved, and the VOCs reaction is promoted at normal timesAt a temperature or low temperature, VOCs in the final air are oxidized to H 2 O and O 2 。
In an embodiment of the invention, the monolithic VOCs catalyst active component Ce-BiVO during back corona plasma discharge 4 -TiO 2 The dielectric constant of Ag can reach more than 10000 at normal temperature. During back corona plasma discharge, due to the existence of Ce-BiVO 4 -TiO 2 And the Ag can polarize the integral VOCs catalyst under the condition of smaller electric field intensity, so that the discharge intensity of back corona plasma is obviously enhanced, and a large amount of active particles such as free electrons, hydroxyl radicals, ozone and the like are obtained. Thus, on one hand, the oxidation-reduction reaction of VOCs gas-phase molecules can be promoted to generate CO 2 And H 2 O, on the other hand, a large amount of free electrons form serious breakdown and damage to cell membranes of bacteria and viruses, so that the sterilization effect is enhanced. Thus, the integral VOCs catalyst is arranged in the back corona plasma, so that the energy utilization efficiency of the back corona plasma can be improved, and the energy consumption of the back corona plasma can be reduced.
In one example, a second ultraviolet radiation is also included in the plasma. The wavelength of the second ultraviolet radiation may comprise 150nm, or 160nm. The wavelength of the second ultraviolet radiation is less than the wavelength of the first ultraviolet radiation. The second ultraviolet radiation will co-treat VOCs and bacteria in the air with the first ultraviolet radiation. As will be described in detail below.
In one example, the plasma may sterilize the air. The plasma contains a large amount of high-energy ions, active groups and other components, is extremely easy to chemically react with enzymes, proteins and nucleic acids in bacteria, mold, spores and viruses, and can destroy and disturb the survival function of microorganisms and cause death of various microorganisms. The directional motion of high-energy particles in the plasma can 'break up' proteins of bacteria, cells and viruses and destroy the integrity of genes, under the action of a high-voltage electric field, the escaped electrons and free electrons are accelerated to obtain very high energy, and electrons with high kinetic energy and breakdown etching effect can seriously break down and destroy cell membranes of bacteria and viruses. Plasma targeting destroys various structures of microorganisms, etches cell walls, destroys biofilms and peroxidized lipids, and bacterial DNA and RNA may be damaged by oxidation.
The catalyst bed 50 is used to treat ozone in the air. Ozone is generated, for example, during plasma formation, and a catalyst bed 50 located after back corona plasma unit 40 may be treated. The catalyst bed 50 comprises a 3D ceramic foam support and a manganese and cobalt bimetallic active ingredient supported on the surface of the 3D ceramic foam support.
In one example, providing a catalyst bed includes:
mn (CH) 3 COO) 2 ·4H 2 O、Co(CH 3 COO) 2 ·4H 2 O, anhydrous citric acid according to (15-20): (25-30): (50-60) mass ratio to form a precursor solution, wherein the concentration of ions in the precursor solution is 0.5-2mol/L (e.g., 1 mol/L), drying at 60-100deg.C (e.g., 80-90deg.C) for 2-5 hours (e.g., 3 hours), and calcining at 300-500deg.C (e.g., 400deg.C) for 3-6 hours (e.g., 5 hours) to obtain Co a Mn 1-a O x A catalyst, wherein a is in the range of 0.2-0.8 (e.g., 0.2, 0.33, 0.5, 0.67, and 0.8);
placing 3D ceramic foam (e.g., cut 3D ceramic foam) on Co a Mn 1-a O x Catalyst solution (e.g., co a Mn 1-a O x The catalyst is dissolved in a solution of ethanol and water, immersed under ultrasonic conditions for 0.5-1 hour, and then dried at 60-100 c (e.g., 80-90 c) for 2-8 hours (e.g., 5 hours).
3D foam ceramic catalyst bed Co a Mn 1-a O x The main active component of the catalyst is MnO x Co prepared by sol-gel method a Mn 1-a O x The catalyst has loose porous structure, which is beneficial to gas phase molecule adsorption of Co a Mn 1-a O x The surface of the catalyst, and then catalytic reaction occurs.
The sol-gel method can lead the metal salt precursor to reach high dispersion at the molecular level, so that the doped element Co can enter MnO x Inside the crystal phase, thereby destroying MnO x A crystal structure which facilitates MnO x The surface generates a large number of oxygen vacancies. When oxygen molecules pass through MnO x At the surface, the ozone molecule is combined with oxygen vacancies through terminal oxygen atoms, the oxygen vacancies are 2e - Electron donor, will 2e - Electrons are transferred to O atoms of ozone, resulting in the cleavage of O-O bonds of ozone, release of oxygen and generation of O 2－ The method comprises the steps of carrying out a first treatment on the surface of the Oxygen atom at the other ozone end and O 2－ The adsorption combination generates electron transfer, leads to the rupture of O-O bond of ozone, releases oxygen and generates O 2 2－ The method comprises the steps of carrying out a first treatment on the surface of the Last O 2 2－ The decomposition releases oxygen, oxygen vacancies recover, and participate in the next ozonolysis cycle. Thus, the catalyst bed of the present invention is capable of removing ozone from air.
In an embodiment of the invention, an air purification and sterilization method is also provided. As shown in fig. 2, the air purification and sterilization method includes:
providing a back corona plasma unit to form plasma, wherein the back corona plasma unit is sequentially provided with a corona electrode, an auxiliary electrode, an integral VOCs catalyst and a grounding electrode in the airflow flowing direction, the integral VOCs catalyst comprises a honeycomb substrate and the VOCs catalyst coated on the inner surface and the outer surface of the honeycomb substrate, the inner surface and the outer surface of the honeycomb substrate comprise whiskers, and the active components of the integral VOCs catalyst comprise Ce-BiVO 4 -TiO 2 /Ag，
Under the irradiation of visible light and/or ultraviolet light, the catalyst passes through Ce-BiVO 4 -TiO 2 Ag for treating VOCs and bacteria in the air;
VOCs and bacteria in the air are treated with the active ingredients in the plasma.
In an embodiment of the present invention, ce-BiVO in monolithic VOCs catalyst is utilized 4 -TiO 2 The active components (e.g., free electrons, energetic ions, active particles) in Ag and plasma treat VOCs and bacteria in the air, achieving purification and sterilization of the air. That is, the synergistic treatment with both effects to purify air and sterilize greatly improves the treatment efficiency compared to each individual technique.
In an embodiment of the present invention, ce-BiVO 4 -TiO 2 The active ingredient in Ag (in particular Ce, bi, V, ag) allows the method of the invention to allow the catalyst to exert a photocatalytic reaction under the effect of radiation of visible light. Compared to TiO which absorbs only UV radiation 2 The method of the invention has higher efficiency and lower cost compared with the catalyst.
In one example, the air purification and sterilization method further comprises: VOCs and bacteria in the air are treated by a combination of ultraviolet radiation of the first ultraviolet radiation and ultraviolet radiation of the second ultraviolet radiation.
Further, the treatment of VOCs by a combination of ultraviolet radiation includes:
the combination of the ultraviolet radiation enables the molecular bonds of VOCs to be broken to generate active molecular fragments;
generating a first reactive species from oxygen and moisture molecules in air by a combination of the ultraviolet radiation, the first reactive species comprising reactive oxygen atoms and hydroxyl radicals;
the reactive molecular fragments are oxidized by the first reactive species to form small molecule compounds.
Embodiments of the present invention use a combination of different wavelengths of ultraviolet radiation to provide a stronger radiant energy that helps to treat VOCs into as small reactive molecular fragments as possible. Small reactive molecular fragments can be more easily subjected to oxidation treatment, i.e., to produce small molecular compounds. Thus, VOCs in the air can be treated more efficiently using a combination of different wavelengths of ultraviolet radiation.
In one example, the air purification and sterilization method further comprises: connecting the electrostatic network with a negative direct current high-voltage power supply, so that dust in the air is charged when passing through the electrostatic network; so that the charged dust is adsorbed on the filter surface. Therefore, the embodiment of the invention can effectively remove dust in the air and improve the air quality.
In one example, the air purification and sterilization method further comprises: ozone in the air is treated by the catalyst bed. Therefore, the embodiment of the invention can effectively remove ozone in the air and avoid the harm of ozone emission to human beings.
The efficiency of the method of the present invention for treating VOCs in air will be described below with a specific example.
1. Preparation of monolithic VOCs catalyst
Cerium acetate, bismuth citrate, vanadyl oxalate and citric acid are formed into sol according to the mass ratio of 12:18:8:62, gel is formed after drying at 90 ℃, and active powder Ce-BiVO is obtained after roasting for 5 hours at 350 ℃ 4 . Active powder Ce-BiVO 4 After being dissolved in water, the mixture is mixed with TiO 2 Uniformly mixing the powder according to the mass ratio of 18:82, reacting for 1 hour under the condition of ultrasonic oscillation, rotary drying for 3 hours at 80 ℃, and roasting for 5 hours at 400 ℃ to obtain Ce-BiVO 4 -TiO 2 . Silver nitrate (AgNO) 3 ) And Ce-BiVO 4 -TiO 2 Mixing according to a mass ratio of 15:85, adding glycerol into the mixed solution, performing rotary drying at 80 ℃ for 3 hours, and roasting at 400 ℃ for 5 hours to obtain Ce-BiVO 4 -TiO 2 Ag catalyst.
Adding diboron trioxide, aluminum nitrate, anhydrous aluminum sulfate and anhydrous sodium sulfate into the cordierite honeycomb substrate to enable the cordierite silicon honeycomb substrate to: diboron trioxide: aluminum nitrate: anhydrous aluminum sulfate: the anhydrous sodium sulfate mass ratio is 30:15:15:20:15, and the cordierite honeycomb substrate is at least partially, and preferably substantially fully, embedded with diboron trioxide, aluminum nitrate, anhydrous aluminum sulfate, and anhydrous sodium sulfate. And (3) placing the mixed material in a muffle furnace, roasting for 6 hours at 1000 ℃, naturally cooling to room temperature, and growing compact aluminum borate whisker on the surface of the cordierite honeycomb substrate.
Ce-BiVO 4 -TiO 2 Uniformly mixing Ag catalyst powder, sodium carboxymethylcellulose, silica sol and water according to the mass ratio of 25:28:12:35 to obtain catalyst slurry, coating the catalyst slurry on a cordierite honeycomb substrate with aluminum borate whiskers growing on the surface on a vacuum coating machine, drying the coated material at 100 ℃ for 2 hours in a drying oven, and then roasting at 450 ℃ in a muffle furnace for 6 hours to obtain the integral VOCs catalyst.
2. Treatment of VOCs
The air purification device of the present invention is used for treatment.
VOCs simulated gas is provided that includes three gases of 100ppm formaldehyde, 100ppm toluene, 100ppm styrene. The three gases are precisely controlled by a mass flowmeter to ensure that the flow rates of the three gases are the same, the concentration of VOCs is 300ppm, and the gases are fully mixed in a mixing tank and then are introduced into a reaction device, and air is selected as carrier gas. And (5) preparing stable mixed gas and directly entering a reaction device. The plasma generation intensity of the back corona plasma unit is regulated and controlled by controlling a negative high-voltage direct current power supply connected to the corona electrode. And detecting the concentration of VOCs in real time by connecting an on-line gas chromatograph at the gas outlet end of the back corona plasma unit. The negative high-voltage direct-current voltage strength of the back corona plasma connected to the corona electrode is sequentially set to 6kV, 8kV, 10kV, 12kV, 14kV and 16kV. Embodiments of the present invention calculate the purification efficiency using the following formula:
in addition, comparative examples are also provided. In the comparative example, the catalyst slurry was not coated on the whisker-grown cordierite honeycomb substrate, and the other conditions were the same as in the examples of the present invention.
Table 1 shows the purification effect of the examples of the present invention and the comparative examples. As can be seen from table 1, the purification efficiency of the example of the present invention for VOCs is as high as 96%, and very high purification efficiency is achieved.
TABLE 1
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. An air purification and sterilization method comprising:
providing a back corona plasma unit to form plasma, wherein the back corona plasma unit is sequentially provided with a corona electrode, an auxiliary electrode, an integral VOCs catalyst and a grounding electrode in the airflow flowing direction, the integral VOCs catalyst comprises a honeycomb substrate and the VOCs catalyst coated on the inner surface and the outer surface of the honeycomb substrate, the inner surface and the outer surface of the honeycomb substrate comprise whiskers, and the active components of the integral VOCs catalyst comprise Ce-BiVO 4 -TiO 2 /Ag；
Under the irradiation of visible light and/or ultraviolet light, the catalyst passes through Ce-BiVO 4 -TiO 2 Ag for treating VOCs and bacteria in the air;
the active components in the plasma are used to treat VOCs and bacteria in the air,
wherein, the method for preparing the monolithic VOCs catalyst comprises the following steps:
providing a honeycomb substrate with whiskers grown on the surface;
providing Ce-BiVO 4 -TiO 2 Ag catalyst;
the Ce-BiVO is mixed according to the first mass ratio 4 -TiO 2 Mixing Ag catalyst with sodium carboxymethyl cellulose, silica sol and water to obtain a first reactant, coating the first reactant on the inner and outer surfaces of a honeycomb substrate growing whiskers, drying and roasting to obtain the integral VOCs catalyst,
wherein Ce-BiVO is provided 4 -TiO 2 The step of the Ag catalyst comprises:
forming a sol by cerium source, bismuth source, vanadium source and citric acid according to a second mass ratio, drying at 80-100 ℃ to form gel, and roasting at 300-500 ℃ for 3-8 hours to obtain active powder Ce-BiVO 4 ；
Active powder Ce-BiVO 4 Solution and TiO 2 Mixing according to a third mass ratio, reacting for 0.5-2 hours under ultrasonic condition, drying for 2-5 hours at 60-100 ℃ and then obtaining the product at 300-Roasting at 500 ℃ for 3-8 hours to obtain Ce-BiVO 4 -TiO 2 ；
Combining a silver source with Ce-BiVO 4 -TiO 2 Mixing according to a fourth mass ratio, adding a reducing agent into the mixed solution, drying at 60-100 ℃ for 2-5 hours, and roasting at 300-500 ℃ for 3-8 hours to obtain Ce-BiVO 4 -TiO 2 Ag catalyst, ag in roasting process + Reduced to nano silver particles.
2. The air cleaning and sterilizing method according to claim 1, wherein,
the first mass ratio is (20-30): 15-20): 10-15): 30-45;
the cerium source comprises cerium acetate;
the bismuth source comprises bismuth citrate;
the vanadium source comprises vanadyl oxalate;
the second mass ratio is (10-15): 15-20): 5-10): 60-70;
the third mass ratio is (15-20): 80-85;
the fourth mass ratio is (10-20) to (80-90);
the reducing agent is glycerol.
3. The air purification and sterilization method according to any one of claims 1-2, further comprising:
upstream of the back corona plasma unit in the direction of flow of the gas stream, a radiation unit is provided comprising at least one ultraviolet light source to emit first ultraviolet radiation having a wavelength greater than a wavelength of second ultraviolet radiation in the plasma;
VOCs and bacteria in the air are treated by a combination of ultraviolet radiation of the first ultraviolet radiation and ultraviolet radiation of the second ultraviolet radiation.
4. The air cleaning and sterilizing method according to claim 3, wherein,
the combination of the ultraviolet radiation enables the molecular bonds of VOCs to be broken to generate active molecular fragments;
generating a first reactive species from oxygen and moisture molecules in air by a combination of the ultraviolet radiation, the first reactive species comprising reactive oxygen atoms and hydroxyl radicals;
the reactive molecular fragments are oxidized by the first reactive species to form small molecule compounds.
5. The air cleaning and sterilizing method according to claim 4, wherein,
the radiating element further comprises at least one visible light source to emit visible light,
passing Ce-BiVO under irradiation of the visible light and/or the first ultraviolet radiation 4 -TiO 2 Ag treats VOCs and bacteria in the air.
6. The air purification and sterilization method according to claim 5, further comprising:
a filter unit is provided at the upstream of the radiation unit in the airflow flowing direction, and a static network and a filter are sequentially arranged in the airflow flowing direction;
connecting the electrostatic network with a negative direct current high-voltage power supply, so that dust in the air is charged when passing through the electrostatic network;
so that the charged dust is adsorbed on the surface of the filter and the filter is grounded.
7. The air purification and sterilization method according to claim 6, further comprising:
downstream of the back corona plasma unit in the direction of airflow, providing a catalyst bed comprising a 3D ceramic foam support and a manganese, cobalt bimetallic active component supported on the surface of the 3D ceramic foam support;
ozone in the air is treated by the catalyst bed.
8. The air cleaning and sterilizing method according to claim 7, wherein,
providing a catalyst bed comprises:
mn (CH) 3 COO) 2 ·4H 2 O、Co(CH 3 COO) 2 ·4H 2 O, anhydrous citric acid according to (15-20): (25-30): (50-60) forming a precursor solution with an ion concentration of 0.5-2mol/L, drying at 60-100deg.C for 2-5 hr, and calcining at 300-500deg.C for 3-6 hr to obtain Co a Mn 1-a O x A catalyst, wherein a is in the range of 0.2-0.8;
co-based 3D ceramic foam a Mn 1-a O x The catalyst solution is immersed for 0.5 to 1 hour under ultrasonic condition and then dried for 2 to 8 hours at 60 to 100 ℃.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211033269.0A CN115419974B (en) | 2022-08-26 | 2022-08-26 | Air purifying and sterilizing method |
| CN202311097942.1A CN116972471A (en) | 2022-08-26 | 2022-08-26 | Air purifying device |
| PCT/CN2023/114433 WO2024041565A1 (en) | 2022-08-26 | 2023-08-23 | Air purification and sterilization method |
| LU506377A LU506377B1 (en) | 2022-08-26 | 2023-08-23 | Air purification and sterilization method |
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| CN202311097942.1A Division CN116972471A (en) | 2022-08-26 | 2022-08-26 | Air purifying device |
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| CN116972471A (en) * | 2022-08-26 | 2023-10-31 | 苏州科技大学 | Air purifying device |
| CN116081687B (en) * | 2022-12-14 | 2024-05-10 | 成都先进金属材料产业技术研究院股份有限公司 | Bismuth vanadate powder based on ultrasonic and/or microwave dispersion and preparation method thereof |
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| JP2001221565A (en) * | 2000-02-07 | 2001-08-17 | Fuji Electric Co Ltd | Cold storage showcase |
| CN102958264A (en) * | 2012-11-20 | 2013-03-06 | 浙江大学 | Plasma generation device and method based on back corona creeping-surface breakdown of catalyst as well as application thereof |
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| CN109945341A (en) * | 2019-03-01 | 2019-06-28 | 深圳明阳电路科技股份有限公司 | Air purifier |
| CN113877569A (en) * | 2020-07-03 | 2022-01-04 | 中国石油化工股份有限公司 | Catalyst for producing pyromellitic dianhydride and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102284077A (en) * | 2010-06-18 | 2011-12-21 | 上海牛翼新能源科技有限公司 | Multifunctional high-efficiency air purifier for indoor (vehicle) environment |
| CN116972471A (en) * | 2022-08-26 | 2023-10-31 | 苏州科技大学 | Air purifying device |
-
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- 2022-08-26 CN CN202311097942.1A patent/CN116972471A/en active Pending
- 2022-08-26 CN CN202211033269.0A patent/CN115419974B/en active Active
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- 2023-08-23 WO PCT/CN2023/114433 patent/WO2024041565A1/en unknown
- 2023-08-23 LU LU506377A patent/LU506377B1/en active IP Right Grant
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001221565A (en) * | 2000-02-07 | 2001-08-17 | Fuji Electric Co Ltd | Cold storage showcase |
| CN102958264A (en) * | 2012-11-20 | 2013-03-06 | 浙江大学 | Plasma generation device and method based on back corona creeping-surface breakdown of catalyst as well as application thereof |
| CN104190433A (en) * | 2014-08-15 | 2014-12-10 | 浙江省环境保护科学设计研究院 | Catalytic ozonation catalyst for volatile organic waste gas treatment as well as preparation method and application of catalytic ozonation catalyst |
| CN109945341A (en) * | 2019-03-01 | 2019-06-28 | 深圳明阳电路科技股份有限公司 | Air purifier |
| CN113877569A (en) * | 2020-07-03 | 2022-01-04 | 中国石油化工股份有限公司 | Catalyst for producing pyromellitic dianhydride and preparation method thereof |
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| WO2024041565A1 (en) | 2024-02-29 |
| CN116972471A (en) | 2023-10-31 |
| CN115419974A (en) | 2022-12-02 |
| LU506377B1 (en) | 2024-04-09 |
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