CN112815413B - Air conditioner air duct sterilization and disinfection module - Google Patents
Air conditioner air duct sterilization and disinfection module Download PDFInfo
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- CN112815413B CN112815413B CN202110032649.1A CN202110032649A CN112815413B CN 112815413 B CN112815413 B CN 112815413B CN 202110032649 A CN202110032649 A CN 202110032649A CN 112815413 B CN112815413 B CN 112815413B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F3/00—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems
- F24F3/12—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the treatment of the air otherwise than by heating and cooling
- F24F3/16—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the treatment of the air otherwise than by heating and cooling by purification, e.g. by filtering; by sterilisation; by ozonisation
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- 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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- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
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Abstract
The invention relates to the technical field of sterilization and disinfection, in particular to a sterilization and disinfection module for an air conditioner air duct, which comprises a photocatalytic carrier material; the photocatalytic carrier material is arranged at the air inlet end of the air conditioner. The disinfection module has the characteristics of high dynamic sterilization speed, no secondary pollution, long-term use and the like; meanwhile, the sterilization and disinfection module adopts a self-made photocatalysis carrier material and a nano silver wire sterilization carrier disinfection material.
Description
Technical Field
The invention relates to the technical field of sterilization and disinfection, in particular to an air conditioner air duct sterilization and disinfection module.
Background
Air conditioning systems have been widely used in large public places such as shopping malls, supermarkets, office buildings, hospitals, stations, airports, restaurants, and the like. The public places have high personnel density, good environmental tightness, poor air fluidity and low self-purification capacity, and are easy to cause various health problems, in particular to diseases of the respiratory system and the like, especially when SARS, new coronary pneumonia and avian influenza are spread in a large spread. In the operation process of the air conditioning system, although certain fresh air is supplemented or the window is opened for ventilation within a certain time, the air breathed by the public still takes the circulating air of the air conditioning system as the main part, the fresh air is seriously insufficient, and various microorganisms are easily bred on the wet surface of the air conditioning system such as a heat exchange coil, a drip tray, a wind channel and the like. Thus, circulating air from an air conditioning system is a potential source for the transmission of such environmental respiratory infections. Therefore, certain sterilization and disinfection measures are absolutely necessary for the air conditioning system; meanwhile, the method can also remove formaldehyde, VOCs, peculiar smell and the like in indoor circulating air.
Improving indoor air quality is particularly important for public places. The air conditioning system mainly comprises two aspects: firstly, the sterilization and disinfection functions of the air conditioning system are improved, and the harm of microorganisms is reduced; secondly, clean the dust removal to air conditioning system at a certain interval, simultaneously assist the chemical disinfection of wind channel surface, comdenstion water, cooling water, filter etc. reduce the environment and the dust of breeding of microorganism, reach better indoor air quality. At present, the air duct of the air conditioning system is mainly sterilized and disinfected in the following modes:
1) and (3) filtering and sterilizing: the filtering and sterilizing process is to utilize physical filtering and sterilizing material to eliminate microbe and other grains in the air duct of air conditioning system to reach certain cleanliness. The method is widely applied to biological medicines and various clean operation spaces, and commonly used filter materials have a microporous structure and mainly comprise glass fibers, ethyl acetate fibers, a solution-spraying type polypropylene non-woven fabric and the like. The filtering method has the advantages that: the barrier efficiency is high; the disadvantages are that: large wind resistance (hundreds of pascals) affects ventilation and air conditioning efficiency; the microorganism is enriched and remained, so that breeding, secondary infection and the like are caused.
2) A spray disinfection method comprises the following steps: the spray disinfection method is a treatment method for disinfecting the surface of air or objects by atomizing a disinfectant with a sprayer, and the atomized particles having a particle size of 10 μm or less account for 90% or more. Because the sprayed particles are small and float in the air and are easy to evaporate, the effects of spraying and fumigating can be achieved. The spraying agent suitable for sterilizing the air duct comprises peracetic acid, hydrogen peroxide, chlorine dioxide and the like. The spray disinfection method has the advantages that: the chemical method has high efficiency; can locally and rapidly sterilize; the disadvantages are that: has certain corrosiveness and is harmful to human body; the effective time is short, and multiple disinfection is needed every day; many dead corners, etc.
3) Ultraviolet disinfection: the ultraviolet ray is an electromagnetic wave, the wavelength of the ultraviolet ray is between 10 and 400nm, the ultraviolet ray is divided into A, B, C wave bands and vacuum 4 wave bands, and the sterilizing effect in the UVC wave band is the best. The UVC band refers to ultraviolet rays with the wavelength of 200nm to 280 nm. The ultraviolet lamp is quartz low-pressure mercury lamp, and has main ultraviolet radiation wavelength of 253.7nm, and can kill various microbes, including various bacteria, viruses, mycoplasma, etc. and is also effective for SARS and COVID-19. The resistance difference of different microorganisms to the microorganisms is large and can be 100-200 times. Ultraviolet radiation energy is low, penetration is weak, and only microorganisms directly irradiated can be killed, so that the disinfection part needs to be fully exposed to ultraviolet rays during disinfection. The proper temperature range of ultraviolet disinfection is 20-40 ℃, the disinfection effect can be influenced by too high or too low temperature, when the ultraviolet disinfection solution is used for air disinfection, the relative humidity of the disinfection environment is lower than 70%, preferably 40-60%, otherwise, the irradiation time is properly prolonged. The disadvantages are as follows: is only suitable for static disinfection and has poor disinfection effect on fast flowing air.
4) Low-temperature plasma: sterilization and disinfection the low-temperature plasma generated by the plasma generator has a killing effect on microorganisms in the air. The low-temperature plasma is a highly ionized gas cloud generated by gas under the action of heating or strong electromagnetic field, mainly comprises electrons, ions, atoms, molecules, active free radicals, rays and the like, and is a fourth existing form of substance, wherein the active free radicals and the rays have strong killing effect on microorganisms. It has the disadvantage of poor disinfection effect on fast flowing gas; can generate ozone which is harmful to human body.
5) Electrostatic sterilization: the static electricity generated by the high-voltage static device adsorbs the microorganisms in the air, so that the aim of sterilization and disinfection is achieved. Under the condition that the electrostatic field generated by the high-voltage electrostatic device is lower than the potential of several kilovolts to several tens of thousands of volts, corona discharge is generated on the discharge electrode metal wire, a large amount of gas particles for charging aerosol particles are generated, and then dust-removing bacteria are charged, dust-floating migration and plate deposition are caused, so that the purposes of dust removal and bacteria removal are achieved. Performance indicators include process air volume, drag loss, capture efficiency, clean air volume, and the like. It has the disadvantage of poor disinfection effect on fast flowing gas; can generate ozone which is harmful to human body.
6) And (3) laser irradiation sterilization: laser is a beam formed by amplifying photons generated by excitation of excited light substances in a laser through a resonant cavity. Has the characteristics of highly concentrated energy and strong directivity. The mechanism of the destruction of the laser to the microbial tissue of bacteria, virus and the like is that firstly, the heat effect causes the death of bacteria, secondly, the photocompression effect compresses and deforms cells to break, and thirdly, the chemical effect causes the breakage of the chemical bonds of the biological molecules or the generation of free radicals. The research on the laser sterilization effect has been started soon, but it is promising from the viewpoint of its excellent effect, and the laser light has a synergistic sterilization effect with oxygen, ultrasonic waves, and the like.
7) And (3) photocatalytic sterilization: the photocatalyst generates strong oxidized hydroxyl free radicals under the excitation of ultraviolet light, the bacteria are killed by oxidizing and destroying cell membranes of the bacteria, and the viruses are easy to oxidize and destroy protein and RNA structures because no cell membrane exists. Different from a common disinfectant which only kills pathogens, the photocatalyst can also thoroughly decompose residual organic matters of the pathogens into carbon dioxide and water, so that corpse destroying and killing are realized, the disinfection is thoroughly realized, and toxin residue and secondary infection are avoided. The defects are that the catalytic sterilization efficiency of the photocatalytic material is low, and the photocatalytic material is not enough to achieve high sterilization rate under high wind speed; and the configuration of parameters of the photocatalytic material and the ultraviolet lamp in the module. Although some air purifiers use photocatalysis to degrade formaldehyde and other organic volatile gases in indoor air, the photocatalyst is only loaded on the inner wall of an aluminum honeycomb, a metal mesh, porous ceramics, porous glass or a purifier, because the specific surface of the base materials is small, the effective active centers of the photocatalyst loaded on the materials are few, and the efficiency of degrading formaldehyde and other volatile gases in air and eliminating bacteria, viruses and peculiar smell in air is low; meanwhile, even if harmful gas in a photocatalytic degradation chamber is used in most of air purifiers, only one or two ultraviolet lamp beads are used for irradiating the photocatalytic material at some time, the photocatalytic material cannot really play a role in degrading indoor organic matters, and air purification is a process capable of keeping long-term effectiveness
It is crucial how to remove various microorganisms in the air duct system of the air conditioning system in the public place to improve the indoor air quality. Moreover, the air sterilization method of the air conditioning system should be selected according to the principle of 'continuous air sterilization, safety to human body, no damage to articles, convenience for reconstruction and maintenance, economy, energy conservation, long service life and stable and reliable sterilization effect'. The chemical sterilization method and the isothermal plasma sterilization method among the above air sterilization methods should be excluded. The sterilization and disinfection in the air duct of the above 7 air-conditioning systems have some problems, but the photocatalytic sterilization has durability and can be used for a long time and has the following characteristics: 1) microorganisms in the disinfection air duct can be rapidly removed; 2) secondary pollutants can not be generated; 3) can be durable and effective, has mature technology, can be used for a long time, and is a choice for sterilizing and disinfecting air ducts.
The other anion sterilization and disinfection technical principle is that silver ions interfere the synthesis of nucleic acid and block the replication of genetic information, including the synthesis of DNA and RNA, and the transcription of mRNA by a DNA template, so that pathogenic bacteria, viruses and the like are killed; in addition, silver ions can well destroy the protein structures of bacteria and viruses and combine with sulfur atoms in proteins (sulfhydryl proteins), so that the proteins lose activity.
In view of this, it is urgently needed to design an efficient air conditioning duct sterilization and disinfection module to comprehensively solve the quality of circulating air of an air conditioning system.
Disclosure of Invention
The invention aims to overcome the problems and provides an air conditioner air duct sterilization and disinfection module which has the characteristics of high dynamic sterilization speed, no secondary pollution, long-term use and the like; meanwhile, the sterilization and disinfection module adopts a self-made photocatalysis carrier material and a nano silver wire sterilization carrier disinfection material.
The air conditioner air duct sterilization module is not required to be replaced, only needs to be cleaned by water regularly, and can be used repeatedly.
The invention provides an air conditioner air duct sterilization and disinfection module, which comprises a photocatalytic carrier material; the photocatalytic carrier material is arranged at the air inlet end of the air conditioner, wherein,
the preparation method of the photocatalytic carrier material comprises the following steps:
1) dissolving metal organic matter in solvent to prepare solution,
the metal organic matter comprises one or more than two of linear titanium oxide polymer, zirconium oxide polymer and cerium acetylacetonate; wherein the concentration of the titanyl polymer solution is 8 to 10 wt% based on titanium;
2) pre-treating the surface of the coated carrier; according to different materials, different pretreatment methods are adopted, such as a ceramic-based carrier material, the ceramic-based carrier material can be soaked in an alkaline solution with the pH value of 11-12 and ultrasonically cleaned, redundant particulate matters are removed, and the specific surface area of the ceramic-based carrier is increased; if the carrier material is a metal-based carrier material, firstly using an acetone solvent for soaking, and then using deionized water for cleaning;
the carrier comprises one of honeycomb ceramic, foamed ceramic or foamed metal;
3) uniformly applying the prepared metal organic matter solution (including linear titanyl polymer solution or doped modified linear titanyl polymer solution) on a carrier, drying and sintering to obtain the nano TiO2Photocatalytic coating structure or doped modified nano TiO2And (3) preparing a photocatalytic carrier material by using a photocatalytic coating structure.
Preferably, the metal-oxygen-organic material in step 1), wherein the linear titanyl polymer and the zirconium-oxygen polymer both have repeating M-O bonds as main chains and have organic groups attached to side groups, comprises the following structural units:
wherein for metallo-organic compounds, R1Independently of one another from the group consisting of-C2H5,-C3H7,-C4H9,-C5H11；R2Represents OR1Or represents selected from CH3COCHCOCH3And CH3COCHCOOC2H5A complexing group of (a); provided that R is based on2Total amount of radicals, at least 50% of R2The group represents said complexing group; the number average molecular weight Mn of the titanyl polymer measured by a vapor pressure permeation method is 2000-3000; is not limited toThe pure titanyl polymer containing the solvent has a softening point, and the softening point measured by a falling ball method is 90-127 ℃;
the zirconium oxide polymer is also an oligomer, in which the value of n is not very high, preferably n is from 10 to 15 when M is titanium and from 15 to 20 when M is zirconium. More preferably, the number average molecular weight of the zirconium oxygen polymer is between 3000 and 3500.
Preferably, the solvent in step 1) is an alcoholic solvent, usually a low-boiling alcoholic solvent, which is a lower alcohol containing 2 to 4 carbon atoms, and the ratio of the solvent to the metal organic compound is (1.5 to 3): 1, the adding amount of the titanium oxygen polymer, the zirconium oxygen polymer and the cerium acetylacetonate is 1: (0.02-0.05): (0.02-0.05); further preferably, the solvent in the step 1) includes ethanol, isopropanol, n-propanol, butanol, and the like.
Preferably, the sterilization and disinfection module further comprises a nano silver wire carrier material; the nano silver wire carrier material is arranged at the air outlet end of the air conditioner and is arranged at the rear end of the photocatalytic carrier material along the air inlet direction;
the preparation method of the nano silver wire carrier material comprises the following steps:
1) dispersing, dissolving and diluting a nano-silver wire in a certain solvent to prepare a solution, wherein the concentration of the solution is 0.1-0.2 wt% in terms of silver;
2) pre-treating the surface of the coated carrier; according to different materials, different pretreatment methods are adopted, such as a ceramic-based carrier material, the ceramic-based carrier material can be soaked in an alkaline solution with the pH value of 11-12 and ultrasonically cleaned, redundant particulate matters are removed, and the specific surface area of the ceramic-based carrier is increased; if the carrier material is a metal-based carrier material, firstly using an acetone solvent for soaking, and then using deionized water for cleaning;
the carrier comprises one of honeycomb ceramic, foamed ceramic or foamed metal;
3) and uniformly applying the prepared nano silver wire solution on a carrier, drying at room temperature, and then irradiating by using a medium-pressure mercury lamp to obtain a sterilizing and disinfecting coating structure of the nano silver wire, thereby preparing the nano silver wire carrier material.
Preferably, the solvent is deionized water.
Preferably, the sterilization and disinfection module further comprises an ultraviolet lamp, the ultraviolet lamp is arranged at the front end of the photocatalytic carrier material along the air inlet direction, and the wavelength of the ultraviolet lamp is 254-385 nm.
Preferably, the ultraviolet lamp comprises an ultraviolet lamp tube or an LED ultraviolet lamp.
Preferably, the wavelength of the ultraviolet lamp tube is 254nm, and the wavelength of the LED ultraviolet lamp tube is 280nm or 370-385 nm.
The carrier photocatalytic material and the carrier nano silver wire material are adopted, and the ultraviolet lamp is matched to use, so that the sterilization efficiency can reach more than 99 percent, and therefore, the carrier photocatalytic material and the carrier nano silver wire material are adopted, and the ultraviolet lamp is matched to use, so that the material has wide market prospect in the fields of central air-conditioning systems and public transportation systems, and is a new-generation environment-friendly sterilization and disinfection module material.
Compared with the prior art, the invention has the advantages that:
1) the invention adopts high-efficiency nano photocatalytic materials, has high disinfection efficiency (more than 99.52 percent) and small wind resistance (less than 20Pa), thoroughly destroys corpse and eliminates traces, and has high concentration of generated free radicals, high disinfection speed and strong capability; LED ultraviolet lamps (low power consumption) can also be adopted; the nano silver can be compounded, and the sterilizing and disinfecting performance is higher; the air purifier can remove formaldehyde, VOCs, peculiar smell and other gases in the air while sterilizing and disinfecting, and has excellent performance; low resistance, low carbon and energy saving; the pressure loss is less than 25Pa even under high wind speed; has high sterilizing effect, can decompose residue, does not enrich and residue virus, and has no secondary pollution.
2) The air conditioning duct is in a sterilization and disinfection modular design, is easy to disassemble and assemble, has diversified installation modes, and is suitable for various air port connection modes; newly building a project, and conveniently installing the modified project; the internal structure is compact, the specific surface area of the effective sterilization and disinfection material is large, and the sterilization efficiency and the air flow are high; the floor area is small, no chemical agent is used, no secondary pollution is caused, and the sterilization and disinfection module is a true sterilization and disinfection module.
Drawings
FIG. 1 is a schematic structural view of an air conditioning duct sterilization and disinfection module according to the present invention;
FIG. 2 is a schematic view of a photocatalytic module of the present invention;
FIG. 3 is an arrangement of the UV lamp beads of the present invention;
reference numerals:
1. an ultraviolet lamp; 2. a photocatalytic support material; 3. and (3) carrying the material by the nano silver wire.
Detailed Description
The present invention will be further described with reference to the following specific examples.
The air conditioner air duct sterilization and disinfection module adopts the square shell, the square photocatalytic sterilization and disinfection module and the nano-silver sterilization module, and the air conditioner air duct sterilization and disinfection module can adopt an appearance structure matched with the internal structure of an air outlet of an air duct. The schematic structural diagram of the air conditioning duct sterilization and disinfection module is shown in fig. 1. As can be seen from figure 1, the sterilization and disinfection module is provided with two groups of photocatalysis, wherein an ultraviolet lamp 1 is arranged at the air inlet end, a photocatalysis carrier material 2 is arranged at the rear end of the ultraviolet lamp, and a nano silver wire carrier material 3 is arranged at the air outlet end.
The sterilization and disinfection module can have different configuration conditions according to different application scenes. The energy-saving air conditioner sterilization and disinfection module can use LED ultraviolet lamp beads, and the common or enhanced air conditioner sterilization and disinfection module can use ultraviolet tube lamps; the combined sterilization and disinfection module can be used in special occasions such as hospitals, not only can the combined photocatalysis module be used, but also a combined form of the combined photocatalysis module and the nano silver module can be used. The design aims to kill most of microorganisms and pathogens in the air under the dynamic condition, namely under the condition that air flows through once, the purification efficiency of the air-conditioning air duct sterilization and disinfection module is improved, and the probability of infectious diseases in public places with population gathering is reduced. Fig. 2 shows a schematic diagram of a photocatalytic module using an ultraviolet lamp tube.
The photocatalysis module can adopt 254nm ultraviolet lamp tubes, and can also adopt 280nm or 370-385nm LED ultraviolet lamps. PhotocatalysisThe carrier material excites electrons on the valence band under the irradiation of ultraviolet light (e)-) A transition to the conduction band, a corresponding hole (h) being generated in the valence band+) Adsorbed on TiO2The dissolved oxygen on the surface of the nano-particle captures electrons to form superoxide anions, and the holes are adsorbed on the TiO2The water on the surface is oxidized into hydroxyl radicals, and the generated superoxide anions and hydroxyl radicals with extremely strong oxidation effect can kill bacteria and viruses in the air and effectively prevent various bacteria, viruses and microorganisms from breeding; simultaneously, formaldehyde and volatile organic compounds in the air can be oxidized and decomposed into harmless CO2And H2O, achieving the purpose of purifying organic matters in the air; in addition, the deodorant also has the function of removing peculiar smell. Hydroxyl free radicals and superoxide anions generated by the photocatalytic carrier material can actively attack bacteria, viruses and the like, do not change per se, and have long-term activity.
The wavelength of the LED ultraviolet lamp is 280nm or 370-385nm, and no ozone is generated during the photocatalytic reaction; meanwhile, compared with the ultraviolet lamp tube used in the existing photocatalytic reaction, the LED ultraviolet lamp does not cause harm to human bodies and the environment. The LED ultraviolet lamp is formed by a plurality of different arrangement and combination modes, so that the optimal utilization is achieved, and the LED ultraviolet lamp can irradiate each part of the photocatalytic carrier material. FIG. 3 is a schematic diagram of arrangement of LED lamp beads. The distance between the ultraviolet lamp beads is 4-6cm, so that the light intensity density of the ultraviolet lamp beads can be well utilized, a light source cannot be wasted, and the function of sterilization and disinfection cannot be achieved due to the fact that air directly flows through the ultraviolet lamp beads.
The nano silver (wire) is disinfected by the generated silver ions. The silver ion has strong inhibiting and killing effect on germs and viruses. However, silver ions are easy to denature under natural conditions, the effective period is short, a large amount of silver ions are harmful to human bodies when being ingested, and the diameter of the nano silver wire material is dozens of nanometers and is dozens of micrometers long, and the surface of the nano silver wire material is coated with the high-molecular micelle, so that on one hand, the release of the silver ions can be controlled, viruses and bacteria can be killed, and the harm to the human bodies can be reduced; on the other hand, the adhesive can be stably attached to carriers such as fibers and the like, and cannot fall off to cause failure or human body injury.
The sterilization and disinfection modules can be applied to the fields of central air-conditioning air duct disinfection and vehicle air duct disinfection, specifically including densely populated places such as office buildings, shopping centers, supermarkets, hotels, restaurants and the like, and can also be applied to places with large population mobility such as buses, subways, waiting rooms and the like.
The air conditioner air duct sterilization and disinfection module is different from other sterilization and disinfection modules in that: the photocatalysis technology is adopted instead of other technical means, so that the photocatalysis material has the characteristic of durable use, no chemical agent is used, and no secondary pollutant is generated.
This wind channel disinfection module that disinfects installs at the air outlet, disinfects the disinfection to the air that has passed through dust removal processing, and long service life can not often change.
The air channel sterilization and disinfection module adopts the self-made photocatalysis carrier material energy and the self-made carrier nano-silver material. In order to solve the technical problems, the invention is realized by the following technical scheme:
a process for preparing the photocatalyst carried material uses honeycomb ceramic, foam ceramic or foam metal as carrier, linear titanyl polymer as main photocatalyst, zirconium-oxygen polymer and cerium acetylacetonate as doped elements to provide doped modified nano TiO2A method for preparing a photocatalytic coating structure, the method comprising the steps of:
1) dissolving a linear titanyl polymer, a zirconium-oxygen polymer and cerium acetylacetonate in a certain solvent according to a certain proportion to prepare a solution, wherein the concentration of the solution is 8-10 wt% in terms of titanium;
2) pre-treating the surface of the coated carrier; according to different materials, different pretreatment methods are adopted, such as soaking the ceramic-based carrier material in an alkaline solution with the pH value of 11-12, and carrying out ultrasonic cleaning to remove redundant particulate matters and increase the specific surface area of the ceramic-based carrier; if the carrier material is a metal-based carrier material, firstly using an acetone solvent for soaking, and then using deionized water for cleaning;
3) uniformly applying the prepared mixed solution of linear titanyl polymer, zirconium-oxygen polymer and cerium acetylacetonate on a carrier, drying and sinteringTo obtain doped modified nano TiO2Photocatalytic coating structure.
A preparation method of a nano-silver wire carrier material adopts honeycomb ceramics, foamed ceramics or metal foam as a carrier, and a nano-silver wire as another sterilization and disinfection material to provide a preparation method of a nano-silver wire sterilization and disinfection coating structure, and the method comprises the following steps:
1) dissolving and diluting a nano silver wire in a certain solvent to prepare a solution, wherein the concentration of the solution is 0.1-0.2 wt% in terms of silver;
2) pre-treating the surface of the coated carrier; according to different materials, different pretreatment methods are adopted, such as a ceramic-based carrier material, the ceramic-based carrier material can be soaked in an alkaline solution with the pH value of 11-12 and ultrasonically cleaned, redundant particulate matters are removed, and the specific surface area of the ceramic-based carrier is increased; if the material is a metal-based carrier material, firstly soaking the material by using an acetone solvent, and then cleaning the material by using deionized water;
3) and uniformly applying the prepared nano silver wire solution on a carrier, drying at room temperature, and irradiating by using a medium-pressure mercury lamp to obtain the sterilizing and disinfecting coating structure of the nano silver wire.
Example 1
1) Dissolving a linear titanyl polymer and a zirconium-oxygen polymer (the atomic ratio of Zr atom to Ti is 4 to 100) in a certain solvent to prepare a solution, wherein the concentration of the solution is 8.8 percent by weight in terms of titanium;
2) pre-treating the surface of the coated carrier; soaking a ceramic-based carrier material in an alkaline solution with the pH value of 11-12, and ultrasonically cleaning to remove redundant particles and increase the specific surface area of the ceramic-based carrier;
3) uniformly applying the prepared metal oxide polymer mixed solution on a honeycomb ceramic carrier, drying and sintering to obtain Zr-doped modified nano TiO2Photocatalytic honeycomb ceramic structures.
Using honeycomb ceramics with the size of 200mm x 400mm and an ultraviolet lamp tube with the length of 400mm, wherein the distance between the honeycomb ceramics and the ultraviolet lamp tube is 70mm to manufacture a photocatalytic air duct for disinfection and sterilizationAnd (5) modules. Through an air purification device for a GB/T34012-2017 ventilation system, the air volume is tested to be 200m at the ambient temperature of 20-25 ℃, the ambient humidity of 50-70 percent RH and the test air volume3In the case of the reaction,/h, the single-pass purification efficiency for E.coli was 92.3%.
The used equipment comprises an aerodynamic test bed, a six-level sieve mesh air impact type sampler and a microbial aerosol generator, wherein the purification efficiency Ew is [ Cw (1-N) -Cd ]/Cw (1-N), wherein Cw is the average test bacterium concentration at a sampling position on a test group, Cd is the average test bacterium concentration at a downstream sampling position of the test group, and N is the natural extinction rate of the test bed in the embodiment 2
1) Dissolving a linear titanyl polymer and a zirconium-oxygen polymer (the atomic ratio of Zr atom to Ti is 4 to 100) in a certain solvent to prepare a solution, wherein the concentration of the solution is 8.8 percent by weight in terms of titanium;
2) pre-treating the surface of the coated carrier; soaking ceramic-based carrier material in alkaline solution with pH of 11-12, ultrasonically cleaning, removing excessive particulate matter, and increasing specific surface area of ceramic-based carrier
3) Uniformly applying the prepared linear polymer mixed solution on a honeycomb ceramic carrier, drying and sintering to obtain Zr-doped modified nano TiO2Photocatalytic honeycomb ceramic structures.
The preparation process of the nano silver wire carrier sterilization and disinfection material comprises the following steps:
1) dissolving and diluting a nano silver wire in a certain solvent to prepare a solution, wherein the concentration of the solution is 0.1-0.2 wt% in terms of silver;
2) pre-treating the surface of the coated carrier;
3) and uniformly applying the prepared nano silver wire solution on a honeycomb ceramic carrier, drying at room temperature, and irradiating by using a medium-pressure mercury lamp to obtain the sterilizing and disinfecting coating structure of the nano silver wire.
Manufacturing a photocatalytic air duct disinfection and sterilization module by using honeycomb ceramics with the size of 200mm x 400mm and an ultraviolet lamp tube with the length of 400mm, wherein the distance between the honeycomb ceramics and the ultraviolet lamp tube is 70 mm; meanwhile, a layer is added at the rear end of the photocatalytic thick filmAnd (3) preparing the nano silver wire honeycomb ceramics into the composite sterilization and disinfection module. Through an air purification device for a GB/T34012-2017 ventilation system, the air volume is tested at 200m under the conditions that the ambient temperature is 20-25 ℃, the ambient humidity is 50-70% RH3In the case of the reaction solution/h, the single purification efficiency for E.coli was 99.52%.
Example 3
1) Dissolving linear titanium oxide polymer and cerium acetylacetonate (the atomic ratio of Ce atom to Ti is 3 to 100) in a certain solvent to prepare a solution, wherein the concentration of the solution is 8.8 percent by weight in terms of titanium;
2) pre-treating the surface of the coated carrier; adopting a ceramic-based carrier material, soaking the ceramic-based carrier material in an alkaline solution with the pH value of 11-12, and ultrasonically cleaning the ceramic-based carrier material to remove redundant particulate matters and increase the specific surface area of the ceramic-based carrier;
3) uniformly applying the prepared linear polymer mixed solution on a honeycomb ceramic carrier, drying and sintering to obtain Sn-doped modified nano TiO2Photocatalytic honeycomb ceramic structures.
The photocatalytic air duct disinfection module is manufactured by using honeycomb ceramics with the size of 200mm x 400mm and an ultraviolet lamp tube with the length of 400mm, wherein the distance between the honeycomb ceramics and the ultraviolet lamp tube is 70 mm. An air purification device for a GB/T34012-2017 ventilation system is used for testing the air volume of 200m at the ambient temperature of 20-25 ℃, the ambient humidity of 50-70% RH and the test air volume of 200m3In the case of the/h, the single decontamination efficiency for Staphylococcus aureus was 99.8%.
Conventional technical knowledge in the art can be used for the details which are not described in the present invention.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and are not limited. Although the present invention has been described in detail with reference to the embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (9)
1. The air conditioner air duct sterilization and disinfection module is characterized by comprising a photocatalytic carrier material; the photocatalytic carrier material is arranged at the air inlet end of the air conditioner, wherein,
the preparation method of the photocatalytic carrier material comprises the following steps:
1) dissolving metal organic matter in solvent to prepare solution,
the metal organic matter comprises linear titanium oxygen polymer, zirconium oxygen polymer and cerium acetylacetonate; wherein the concentration of the linear titanyl polymer solution is 8 to 10 wt% based on titanium; the addition amount of the linear titanium oxide polymer, the zirconium oxide polymer and the cerium acetylacetonate is 1: (0.02-0.05): (0.02-0.05); wherein the content of the first and second substances,
the titanyl polymer and the zirconium oxide polymer in the step 1) are metal oxide polymers which take repeated M-O bonds as main chains and are connected with organic groups on side groups, and comprise the following structural units:
wherein R is1Independently of one another from the group consisting of-C2H5, -C3H7, -C4H9or-C5H11；R2Represents OR1Or represents selected from CH3COCHCOCH3Or CH3COCHCOOC2H5A complexing group of (a);
when M is titanium, n is 10 to 15,
when M is zirconium, n is 15-20;
2) pre-treating the surface of the coated carrier;
the carrier comprises one of honeycomb ceramic, foamed ceramic or foamed metal;
3) uniformly applying the prepared metal organic solution on a carrier, drying and sintering to obtain the doped modified nano TiO2And (3) preparing a photocatalytic carrier material by using a photocatalytic coating structure.
2. The air conditioning duct sterilization and disinfection module of claim 1, wherein the solvent in step 1) is an alcohol solvent, which is a lower alcohol containing 2-4 carbon atoms, and the ratio of the solvent to the linear metal oxide polymer is (1.5-3): 1.
3. the air conditioning duct sterilization and disinfection module of claim 1, wherein the pretreatment in step 2) comprises: soaking in alkaline solution, and ultrasonically cleaning; alternatively, the substrate is soaked with an acetone solvent and then washed with deionized water.
4. The air conditioning duct sterilization and disinfection module of claim 1, further comprising a nano-silver wire carrier material; the nano silver wire carrier material is arranged at the air outlet end of the air conditioner and is arranged at the rear end of the photocatalytic carrier material along the air inlet direction;
the preparation method of the nano silver wire carrier material comprises the following steps:
1) dispersing and diluting the nano silver wire in a certain solvent to prepare a solution, wherein the concentration of the solution is 0.1-0.2 wt% in terms of silver;
2) pre-treating the surface of the coated carrier;
the carrier comprises one of honeycomb ceramic, foamed ceramic or foamed metal;
3) and uniformly applying the prepared nano silver wire solution on a carrier, drying at room temperature, and then irradiating by using a medium-pressure mercury lamp to obtain a sterilizing and disinfecting coating structure of the nano silver wire, thereby preparing the nano silver wire carrier material.
5. The air conditioning duct sanitizing module of claim 4, wherein said solvent is deionized water.
6. The air conditioning duct sterilization and disinfection module of claim 4, wherein the pretreatment in step 2) comprises: soaking in alkaline solution, and ultrasonically cleaning; alternatively, the substrate is soaked with an acetone solvent and then washed with deionized water.
7. The air conditioning duct sterilization and disinfection module of any one of claims 1-4, wherein the sterilization and disinfection module further comprises an ultraviolet lamp disposed at the front end of the photocatalytic carrier material along the intake direction, and the wavelength of the ultraviolet lamp is 254-385 nm.
8. The air conditioning duct sterilization and disinfection module of claim 7, wherein the ultraviolet lamp comprises an ultraviolet lamp tube or an LED ultraviolet lamp.
9. The air conditioning duct sterilization and disinfection module of claim 8, wherein the wavelength of the ultraviolet lamp tube is 254nm, and the wavelength of the LED ultraviolet lamp is 280nm or 370-385 nm.
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