CN111497571B - Novel indoor air purification method - Google Patents
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- CN111497571B CN111497571B CN202010298266.4A CN202010298266A CN111497571B CN 111497571 B CN111497571 B CN 111497571B CN 202010298266 A CN202010298266 A CN 202010298266A CN 111497571 B CN111497571 B CN 111497571B
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- 238000000034 method Methods 0.000 title claims abstract description 18
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- 238000004659 sterilization and disinfection Methods 0.000 claims abstract description 29
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
- B60H3/00—Other air-treating devices
- B60H3/0071—Electrically conditioning the air, e.g. by ionizing
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- A—HUMAN NECESSITIES
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- 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
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- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
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- 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
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
- A61L9/00—Disinfection, sterilisation or deodorisation of air
- A61L9/16—Disinfection, sterilisation or deodorisation of air using physical phenomena
- A61L9/22—Ionisation
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- 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
- B01D53/88—Handling or mounting catalysts
- B01D53/885—Devices in general for catalytic purification of waste gases
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J31/00—Catalysts comprising hydrides, coordination complexes or organic compounds
- B01J31/26—Catalysts comprising hydrides, coordination complexes or organic compounds containing in addition, inorganic metal compounds not provided for in groups B01J31/02 - B01J31/24
- B01J31/38—Catalysts comprising hydrides, coordination complexes or organic compounds containing in addition, inorganic metal compounds not provided for in groups B01J31/02 - B01J31/24 of titanium, zirconium or hafnium
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- B01J35/39—Photocatalytic properties
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Abstract
The invention provides a novel indoor air purification method, in a movable cabinet device, firstly, air is converted into ozone through an ultraviolet lamp with the wavelength of 180-200 nm, meanwhile, the ozone acts on a catalytic film covered on the surface of a baffle plate to generate a photocatalytic reaction to generate active free radicals including negative oxygen ions, and the air is purified once through the ozone and the active free radicals; and then, carrying out secondary disinfection and sterilization on the air by using an ultraviolet lamp of 248-260 nm, reducing the residual ozone into oxygen, and finally sending out negative oxygen ions carried by the air to obtain the purified air. The invention can effectively purify the air, simultaneously completely reduce the generated ozone, absorb ultraviolet light for photocatalytic sterilization, avoid the exposure of the ultraviolet light and greatly improve the efficiency and the safety of air purification.
Description
Technical Field
The invention belongs to the technical field of air purification, and particularly relates to a novel indoor air purification method.
Background
With the development of the field of computers, modern people can not leave computers in life and work, so that people are located indoors most of the time a day, indoor air is polluted by 5-10 times of outdoor air due to the fact that people are numerous and fresh air cannot be replaced quickly, and the health of people is greatly influenced. Therefore, the research of indoor air purification technology is of great significance, especially for many office buildings using a central air conditioning system without air purification.
Ultraviolet and ozone have the characteristics of sterilization, peculiar smell removal, harmful particle degradation and the like, and are widely researched and applied in air purification, but ultraviolet irradiation and ozone suction are harmful to human bodies, and simultaneously, ultraviolet irradiation can cause aging of instruments and shorten the service life of the instruments, so that the research on solving the potential safety hazard brought by purifying air by using ultraviolet and ozone is of great significance.
Disclosure of Invention
Aiming at the defects of potential safety hazards such as ultraviolet rays and ozone leakage existing in the existing air purification by combining ultraviolet rays and ozone, the invention provides a novel indoor air purification method, which improves the decomposition rate of ozone after air purification by combining ultraviolet rays and ozone, avoids exposure of ultraviolet rays and improves the air purification efficiency.
The invention is realized by the following technical scheme:
a novel indoor air purification method comprises the following steps:
(1) in the movable cabinet device, a fan is utilized from an air inlet according to the length of 0.1-0.3 m 3 The air to be purified is sent to a first ultraviolet lamp tube region, a first ultraviolet lamp of the first ultraviolet lamp tube region acts on the air to be purified to generate ozone, meanwhile, a catalytic film covered on the surface of a baffle close to the first ultraviolet lamp tube region performs a photocatalytic reaction under the action of the first ultraviolet lamp to generate active free radicals, and the air to be purified is subjected to primary sterilization under the combined action of the ozone and the active free radicals;
(2) The air after primary sterilization is conveyed to a second ultraviolet lamp tube region from the baffle gap under the action of a fan, and secondary sterilization is carried out under the action of the second ultraviolet lamp tube; simultaneously, the second ultraviolet lamp tube acts on residual ozone in the primary sterilized air to reduce the residual ozone into oxygen; obtaining secondary sterilized air;
(3) the air after the secondary sterilization is sent out from the air outlet, and then purified air can be obtained;
the ultraviolet lamps in the first ultraviolet lamp tube region are arranged side by side, the wavelength is 180-200 nm, the power is 10-200W, and the radiation intensity is 170-340 mu W/cm 2 ；
The ultraviolet lamps in the second ultraviolet lamp tube region are arranged side by side and are vertical to the first ultraviolet lamp tube to form at least 2 rows of grids, the wavelength is 248-260 nm, the power is 30-300W, and the radiation intensity is 200-350 mu W/cm 2 ；
The baffle be two rows of setting and form "eight" font for going up and down, be fixed in the inner wall between the first ultraviolet lamp region of mobile device and the second ultraviolet lamp region, be close to the regional catalytic film that scribbles of first ultraviolet lamp on the baffle of first ultraviolet lamp region with thickness 1 ~ 2 mm.
The preparation method of the catalytic film comprises the following steps:
a1: placing glass fibers in a mixed solution of sulfuric acid and hydrogen peroxide in a volume ratio of 7:3, boiling for 5min, taking out, rinsing with deionized water to be neutral, and drying to obtain pretreated glass fiber cloth; the concentrated sulfuric acid concentration is 1mol/L, and the mass part of the hydrogen peroxide is 30%;
A2: adding 0.1-0.2 part of nano titanium dioxide into 6-8 parts of absolute ethyl alcohol according to the mass part ratio, stirring for 30min, then adding 3-4 parts of modified corn starch solution, and continuously stirring for 30min to obtain solution A; dissolving ammonium metavanadate in an oxalic acid solution with the mass concentration of 5% to obtain a solution C; slowly dripping the solution B into the solution A under the stirring condition, stirring and reacting for 2 hours to obtain semitransparent sol, and then aging for 40-60 min to obtain a catalytic liquid;
the dosage of the ammonium metavanadate is used according to n (vanadium) = (0.01-0.03): 1;
a3: soaking the pretreated glass fiber cloth in a catalytic solution for 1min, and then drying at 100 ℃ for 5min to obtain a catalytic film;
the preparation method of the curing liquid comprises the following steps:
b1: dissolving 5-10 parts of epoxidized soybean oil acrylate with the mass concentration of 10-30% and 2-4 parts of photoinitiator with the mass concentration of 4-6% in ethyl acetate according to the mass part ratio to obtain a photoreaction solution; the photoinitiator is Irgacure 819;
b2: adding 3-4 parts of photoreaction solution and 1.5-2.5 parts of modified corn starch into 100 parts of distilled water, uniformly mixing, then adding 0.5-1.5 parts of glycerol and 0.05-0.1 part of nano titanium dioxide powder, uniformly mixing, adjusting the pH value to 8.0, and magnetically stirring for 30-60 min to obtain a curing solution.
The air purification method firstly uses an ultraviolet lamp with the wavelength of 180-200 nm to act on oxygen in air to be converted into ozone on one hand and irradiate a catalytic film prepared from a photocatalyst material titanium dioxide on the other hand to generate active free radicals with extremely strong oxidation capacity, wherein the active free radicals comprise hydroxyl ions (OH) and negative oxygen ions (O) 2 - ) Using ozone, hydroxyl ions (. OH) and negative oxygen ions (. O) 2 - ) The air is purified for one time, the harmful bacteria in the air are killed, the peculiar smell is removed, and active free radical hydroxide ions (OH) and negative oxygen ions (O) are generated by photocatalysis 2 - ) Can decompose thallus, formaldehyde, harmful organic matters, suspended solid pollutants and the like in the air; then, sterilizing and purifying air by using an ultraviolet lamp with the wavelength of 248-260 nm on one hand, reducing the residual ozone in the environment into oxygen on the other hand, and completely reducing the residual ozone in the environment under the two actions; and finally, negative oxygen ions carried in the air are sent out of the device, so that the purified air is obtained, and the whole process is safe and environment-friendly.
Meanwhile, the ozone generated by the ultraviolet lamp acting on the air can effectively inhibit the recombination of photohole and photogenerated electron, so that the photogenerated hole can effectively adsorb water molecules, organic matters, oxygen and the like to generate oxidation-reduction reaction, and OH on the surface of the photogenerated hole is subjected to oxidation-reduction reaction - And H 2 O is oxidized into hydroxide ions (OH) with stronger oxidizing power, so that the photocatalytic efficiency is improved; the photo-generated electrons (e) react with oxygen molecules on the surface to generate negative oxygen ions (O) 2 - ) Negative oxygen ion (O) 2 - ) And further with H + Acting to form H 2 O, and finally generating hydroxide ions with strong oxidizing capacity through a series of reactionsThe seed (. OH) degrades viruses and bacteria in the air.
The baffle is kept apart through the baffle in first ultraviolet lamp region and second ultraviolet lamp region, each other does not influence, and baffle slope is crisscross to be set up, forms and can supply the circulation of air and the unable hole that passes of ultraviolet light.
The catalytic film is prepared by using glass fiber cloth pretreated by sulfuric acid and hydrogen peroxide, loading nano titanium dioxide which is crosslinked with epichlorohydrin modified corn starch and doped with vanadium ions. The glass fiber has the advantages of low price, high strength, large specific surface area, acid and alkali corrosion resistance, high temperature resistance and good light transmission, can be woven into various shapes according to needs, titanium dioxide is loaded on the glass fiber cloth, a sample can obtain larger specific surface area, and the good light transmission performance of the glass fiber cloth can also improve the utilization efficiency of the titanium dioxide on ultraviolet light, so that the photocatalysis efficiency is improved; a large amount of-OH groups are generated on the surface of the glass fiber cloth treated by sulfuric acid and hydrogen peroxide, the hydrophilicity of the glass fiber cloth is enhanced, and meanwhile, the negatively charged-OH groups are charged to the positively charged TiO 2 The micelle has stronger adsorption effect, so that the nano titanium dioxide can be firmly loaded on the glass fiber cloth; the modified corn starch is utilized to enhance the bonding effect of bonds between starch molecules and improve the light transmittance of the glass fiber cloth loaded with the film, so that the catalytic film can still transmit more ultraviolet light to decompose ozone under the irradiation of an ultraviolet lamp with the wavelength of 248-260 nm, meanwhile, the photocatalytic reaction of the nano titanium dioxide in the film is more complete, and the efficiency of sterilization and ozone decomposition is further improved; vanadium ions are doped in titanium dioxide, so that the separation of photo-generated electrons and photo-generated holes can be promoted when the titanium dioxide generates a photo-reaction, the photo-catalytic activity is improved, and the air purification efficiency is further improved.
As a further improvement of the invention, the preferred power of the ultraviolet lamp with the wavelength of 180-200 nm is 20-100W, and the radiation intensity is 200 mu W/cm 2 (ii) a The preferable power of the ultraviolet lamp with the wavelength of 248-260 nm is 80-150W, and the radiation intensity is 350 mu W/cm 2 。
The ultraviolet lamp with the wavelength of 180-200 nm is used for converting air into ozone, too much ozone is generated due to too high power, the subsequent complete reduction of the ozone is not facilitated, and the power cannot be too low, so that the ozone quantity is small and the air cannot be completely sterilized; the ultraviolet lamp with the wavelength of 248-260 nm is mainly used for reducing residual ozone and further sterilizing air, so that the power is high, and the air can be sterilized by completely reducing the ozone at the same time.
As a further improvement of the invention, the total molar concentration of the active free radicals generated in the step (1) is 10-100 mu mol/L.
The free radical catalytic film prepared from the photocatalyst titanium dioxide is used for carrying out photocatalytic reaction to generate active free radicals with extremely strong oxidizing capability, including hydroxide ions (OH) and negative oxide ions (O) 2 - ) Both of them have strong killing and decomposing power to virus, bacteria and harmful compound, and at the same time, they have negative oxygen ion (O) 2 - ) The air purifier is a substance which is very beneficial to human health, so that the purified air is conveyed out with negative oxygen ions, and the beneficial effect of the purified air on human body is improved; in order to achieve the air purification effect and improve the air safety after ozone reduction, the total molar concentration of active free radicals generated by photocatalytic reaction can not be too low, and through determination, the air purification effect can be achieved when the total molar concentration of the active free radicals is 10-100 mu mol/L, and the air purification effect is also most beneficial to human bodies.
As a further improvement of the invention, a catalytic thin film curing liquid with the thickness of 1-2 mm is coated on the baffle close to the first ultraviolet lamp area, and the preparation method of the curing liquid comprises the following steps:
B1: dissolving 5-10 parts of epoxidized soybean oil acrylate with the mass concentration of 10-30% and 2-4 parts of photoinitiator with the mass concentration of 4-6% in ethyl acetate according to the mass part ratio to obtain a photoreaction solution; the photoinitiator is Irgacure 819;
b2: adding 3-4 parts of photoreaction solution and 1.5-2.5 parts of modified corn starch into 100 parts of distilled water, uniformly mixing, then adding 0.5-1.5 parts of glycerol and 0.05-0.1 part of nano titanium dioxide powder, uniformly mixing, adjusting the pH value to 8.0, and magnetically stirring for 30-60 min to obtain a curing solution.
The epoxy soybean oil acrylate has wide functionality distribution, and can better block and adsorb particles; each molecule of the epoxidized soybean oil acrylate has a plurality of functional sites, and can be used for curing electron beams so as to absorb ultraviolet light, when nano titanium dioxide is irradiated by ultraviolet light to perform a photocatalytic reaction, generated electrons are also restricted by the epoxidized soybean oil acrylate, and the electrons and holes can not be compounded, so that the photocatalytic activity of the titanium dioxide is improved, and the titanium dioxide can generate active free radicals with higher activity under the photocatalytic reaction, including oxyanion O 2- OH and the like, so that the sterilization is more thorough, and the decomposition of harmful organic matters is more complete; the photoinitiator is added to enable the solution to be cured when absorbing ultraviolet light to form a film to cover the surface of the baffle plate, so that the film only needs to be peeled off when the baffle plate is cleaned. And the stripped film restrains the photoproduction electrons of the titanium dioxide through the crosslinking of the epoxy soybean oil acrylate, so the film has strong photocatalytic activity after being dissolved again, can be repeatedly utilized, improves the utilization rate of raw materials and reduces the cost.
As a further improvement of the invention, the preparation method of the modified corn starch comprises the following steps:
d1: weighing 25 parts of dry corn starch according to the mass part ratio, adding 37.5 parts of alkaline sodium chloride solution, and fully stirring until the corn starch is completely dissolved to obtain a mixed solution;
the alkaline sodium chloride solution is prepared by dissolving 0.3-0.9 part of sodium hydroxide and 1.5 parts of sodium chloride in 50 parts of water according to the mass ratio;
d2: stirring the mixed solution in a constant-temperature water bath at 30-50 ℃, adding 1-2 parts of epoxy chloropropane alkaline solution, and reacting for 6-8 hours to obtain a reaction solution;
d3: and (3) regulating the pH of the reaction liquid to 6.5-7.0 by using 1mol/L hydrochloric acid solution, centrifuging for 5min at 4000r/min, taking the lower-layer precipitate, and drying for 6h at 55 ℃ to obtain the modified corn starch.
The epichlorohydrin is used for modifying the corn starch, and the bonding effect of bonds among starch molecules is enhanced, so that the catalytic film can still transmit more ultraviolet light to decompose ozone under the irradiation of an ultraviolet lamp with the wavelength of 248-260 nm, meanwhile, the photocatalytic reaction of nano titanium dioxide in the film is more complete, and the sterilization and ozone decomposition efficiency is further improved; vanadium ions are doped in titanium dioxide, so that the separation of photo-generated electrons and photo-generated holes can be promoted when the titanium dioxide generates a photo-reaction, the photo-catalytic activity is improved, and the air purification efficiency is further improved.
As a further improvement of the invention, the movable cabinet body device comprises a box body, wherein an air inlet is formed in one side of the bottom of the box body, and an air outlet is formed in one side of the top of the box body; a fan, a first ultraviolet lamp area formed by a first ultraviolet lamp tube and a second ultraviolet lamp area formed by a second ultraviolet lamp tube are sequentially arranged in the box body from bottom to top; the first ultraviolet lamp tube is arranged on the wall of the box body, and the second ultraviolet lamp tube is vertically arranged between the two walls of the box body;
a baffle is arranged between the first ultraviolet lamp tube and the second ultraviolet lamp tube; the baffles are arranged in two rows and are fixed on the inner wall of the box body; each row is provided with a plurality of baffles which are parallel to each other, and an included angle of 30-45 degrees is formed between the two rows of baffles.
According to the movable cabinet device, air pumped by the fan enters the first ultraviolet lamp tube regions arranged on the wall bodies at two sides, is irradiated by ultraviolet light of 180-200 nm of the first ultraviolet lamp tube to generate ozone for primary purification, the air after primary purification enters the second ultraviolet lamp tube regions in a multi-row grid shape through the pumping fan, is in contact with the catalytic film wrapped outside the second ultraviolet lamp tube, and is subjected to photocatalytic reaction and ultraviolet light of 248-260 nm penetrating through the catalytic film for secondary purification and ozone decomposition, so that the efficiency and safety of air purification are improved, and the baffle is arranged between the first ultraviolet lamp tube and the second ultraviolet lamp tube, so that mutual interference of ultraviolet light with different wavelengths can be avoided, and the sterilization efficiency of the ultraviolet light is improved. The mobile device is small in size and can be arranged in a closed central air-conditioning system, an indoor air-conditioning device and a driving air-conditioning system, the ultraviolet lamp tube circuit is controlled by a microcomputer time control switch arranged outside the mobile cabinet body device, the opening time point and the opening time of the ultraviolet lamp tube can be set, the set time can be set between 1 minute and 168 hours, and therefore personnel can safely leave after the opening time point and the opening time are set, the personnel are prevented from directly contacting ultraviolet rays and ozone, and safety is guaranteed.
As a further improvement of the invention, the first ultraviolet lamp tube and the second ultraviolet lamp tube are both LED ultraviolet lamps, and the core light source of the lamp is a light-emitting diode prepared on the basis of aluminum gallium nitride.
The LED ultraviolet lamp has the characteristic of small volume, is suitable for the pre-packaging process of streamlined operation of mass products with various appearance structures and various materials, and can be matched as a light source of a set of ultraviolet sterilization equipment and an ultraviolet light source of a set of indoor air sterilizer; the air sterilizer is suitable for indoor air sterilization and disinfection in household and public places; is applied to various household appliances such as disinfection cabinets, microwave ovens and the like. The core light source of the LED ultraviolet light disclosed by the invention is preferably a light-emitting diode prepared on the basis of aluminum gallium nitride or gallium nitride. The light emitting diode based on the aluminum gallium nitride or the gallium nitride has the advantages of long service life, low voltage, adjustable wavelength, environmental protection, good directivity, rapid switching, shock resistance, moisture resistance, portability, flexibility and the like, and can improve the light extraction efficiency and the light output power when being used as a light emitting chip of an LED ultraviolet lamp.
The invention has the beneficial effects that:
1. according to the invention, an ultraviolet lamp with the wavelength of 180-200 nm is utilized to act on air to generate ozone on one hand, and act on a catalytic film to generate a photocatalytic reaction to generate active free radicals on the other hand, the air is purified for the first time through the ozone and the active free radicals, and then the air is purified for the second time through the ultraviolet lamp with the wavelength of 248-260 nm, and the ozone is reduced at the same time; two steps of air purification combine to decompose ozone, and the air that finally purifies carries negative oxygen ion, can not carry ozone, and the ultraviolet ray can not leak outward by effectual separation and cause the injury simultaneously.
2. The invention utilizes glass fiber treated by sulfuric acid and hydrogen peroxide to load nano titanium dioxide crosslinked with modified epichlorohydrin corn starch to prepare a catalytic film, then the catalytic film is coated on a baffle, and a first ultraviolet lamp irradiates to realize photocatalytic reaction to generate active free radical to purify air. The prepared film has high light transmittance, high utilization rate of titanium dioxide to ultraviolet light and high catalytic activity, thereby improving the air purification efficiency and improving the safety of the purified air.
3. The invention utilizes the epoxy soybean oil acrylate cross-linked titanium dioxide and the photoinitiator solution to prepare the photocatalytic solution, the photocatalytic solution is coated on the partition board to sterilize the air, the propagation of photoelectrons can be restrained, thereby absorbing ultraviolet light to avoid the damage caused by the leakage of the ultraviolet light, meanwhile, the photocatalytic ability can also improve the photocatalytic activity of the titanium dioxide, the air is further purified, negative oxygen ions generated by photocatalysis are conveyed out along with the purified air, the quality of the purified air is improved, and the efficiency of air purification is improved.
Drawings
Fig. 1 is a schematic front sectional view of the sealing device of the present invention.
Fig. 2 is a schematic left-side sectional view of the sealing device of the present invention.
Reference numerals are as follows: the lamp comprises a box body 1, an air inlet 101, an air outlet 102, a fan 2, a first ultraviolet lamp tube 3, a second ultraviolet lamp tube 4 and a baffle 5.
Detailed Description
The invention will be further explained with reference to the drawings.
Example 1
A novel indoor air purification method comprises the following steps:
(1) a fan, an ultraviolet lamp tube and a movable cabinet device are arranged in the movable cabinet device, the movable cabinet device is shown in figures 1 and 2 and comprises a box body 1, an air inlet 101 is formed in one side of the bottom of the box body 1, and an air outlet 102 is formed in one side of the top of the box body; a fan 2, a first ultraviolet lamp tube 3 and a second ultraviolet lamp tube 4 are sequentially arranged in the box body 1 from bottom to top; the first ultraviolet lamp tube 3 is arranged on the wall of the box body 1, and the second ultraviolet lamp tube 4 is vertically arranged between the two walls of the box body 1;
the first ultraviolet lamp tubes 3 are arranged side by side, the wavelength is 200nm, the power is 10W, and the radiation intensity is 340 mu W/cm 2 (ii) a Said secondThe ultraviolet lamp tubes 4 are arranged side by side and are vertical to the first ultraviolet lamp tubes to form at least 2 rows of grids, the wavelength is 260nm, the power is 30W, and the radiation intensity is 350 mu W/cm 2 (ii) a Baffles 5 which are obliquely and alternately arranged are arranged between the first ultraviolet lamp tube 3 and the second ultraviolet lamp tube 4, and catalytic films with the thickness of 1 are coated on the baffles 5 which are close to the first ultraviolet lamp area and the second ultraviolet lamp area; and finally, the movable cabinet body device is arranged in an air inlet pipeline of the central air conditioner.
(2) The fan 2 is utilized from the air inlet 101 according to the 0.3m 3 The air to be purified is sent to a first ultraviolet lamp area formed by 3 first ultraviolet lamp tubes 3 in parallel, the first ultraviolet lamp 3 in the first ultraviolet lamp tube area acts on the air to be purified to generate ozone, and meanwhile, a catalytic film covered on the surface of a baffle 6 close to the first ultraviolet lamp tube area performs a photocatalytic reaction under the action of the first ultraviolet lamp 3 to generate active free radicals with the total molar concentration of 10 mu mol/L, wherein the active free radicals comprise hydroxide ions (OH) and negative oxygen ions (O) 2 - ) The air to be purified is sterilized once through the combined action of ozone and active free radicals.
(3) The air after primary sterilization is sent to the second ultraviolet lamp tube region from the gap of the baffle 5 under the action of the fan, and secondary sterilization is carried out under the action of the second ultraviolet lamp tube 4; meanwhile, the second ultraviolet lamp tube 4 acts on the residual ozone in the primary sterilized air to reduce the residual ozone into oxygen.
(4) The air after the secondary sterilization carries negative oxygen ions and is sent out from the air outlet 102, and then purified air can be obtained.
The first ultraviolet lamp tube 3 and the second ultraviolet lamp tube 4 are both LED ultraviolet lamps, and a core light source of the first ultraviolet lamp tube and the second ultraviolet lamp tube is a light emitting diode prepared on the basis of aluminum gallium nitride. The ultraviolet lamp circuit is controlled by a microcomputer time control switch arranged indoors, and the starting time and the starting duration of the ultraviolet lamp can be set.
The preparation method of the catalytic film comprises the following steps:
a1: placing glass fibers in a mixed solution of sulfuric acid and hydrogen peroxide in a volume ratio of 7:3, boiling for 5min, taking out, rinsing with deionized water to be neutral, and drying to obtain pretreated glass fiber cloth; the concentrated sulfuric acid concentration is 1mol/L, and the mass part of the hydrogen peroxide is 30%;
a2: adding 0.2 part of nano titanium dioxide into 8 parts of absolute ethyl alcohol according to the mass part ratio, stirring for 30min, then adding 4 parts of modified corn starch solution, and continuing stirring for 30min to obtain solution A; according to n (vanadium) =0.03:1, dissolving ammonium metavanadate in an oxalic acid solution with the mass concentration of 5% to obtain a C solution; slowly dripping the solution B into the solution A under the stirring condition, stirring and reacting for 2 hours to obtain semitransparent sol, and then aging for 60 minutes to obtain a catalytic solution;
a3: soaking the pretreated glass fiber cloth in a catalytic solution for 1min, and then drying at 100 ℃ for 5min to obtain a catalytic film;
the preparation method of the modified corn starch comprises the following steps:
d1: weighing 25 parts of dry corn starch according to the mass part ratio, adding 37.5 parts of alkaline sodium chloride solution, and fully stirring until the corn starch is completely dissolved to obtain a mixed solution; the alkaline sodium chloride solution is prepared by dissolving 0.3 part of sodium hydroxide and 1.5 parts of sodium chloride in 50 parts of water according to the mass ratio.
D2: and (3) stirring the mixed solution in a constant-temperature water bath at 30 ℃, adding 1 part of epoxy chloropropane alkaline solution, and reacting for 6-8 hours to obtain a reaction solution.
D3: and (3) adjusting the pH of the reaction solution to 6.5 by using 1mol/L hydrochloric acid solution, centrifuging for 5min at 4000r/min, and drying the lower-layer precipitate at 55 ℃ for 6h to obtain the modified corn starch.
The device of this embodiment is installed in central air conditioning air intake department, through handling the back, detects central air conditioning air-out air quality, wherein: the inhalable particle pollutant concentration is 0.02 mg/m 3 PM2.5 concentration value of 0.003 mg/m 3 The formaldehyde concentration is 0 mg/m 3 CO concentration of 0 mg/m 3 。
Example 2
A method for purifying air in a vehicle comprises the following steps:
(1) a fan, an ultraviolet lamp tube and a movable cabinet device are arranged in the movable cabinet device, the movable cabinet device is shown in figures 1 and 2 and comprises a box body 1, an air inlet 101 is formed in one side of the bottom of the box body 1, and an air outlet 102 is formed in one side of the top of the box body; a fan 2, a first ultraviolet lamp tube 3 and a second ultraviolet lamp tube 4 are sequentially arranged in the box body 1 from bottom to top; the first ultraviolet lamp tube 3 is arranged on the wall of the box body 1, and the second ultraviolet lamp tube 4 is vertically arranged between the two walls of the box body 1;
the first ultraviolet lamp tubes 3 are arranged side by side, the wavelength is 180nm, the power is 200W, and the radiation intensity is 170 mu W/cm 2 (ii) a The second ultraviolet lamp tubes 4 are arranged side by side and are vertical to the first ultraviolet lamp tubes to form at least 2 rows of grids, the wavelength is 248nm, the power is 300W, and the radiation intensity is 200 mu W/cm 2 (ii) a Baffles 5 which are obliquely and alternately arranged are arranged between the first ultraviolet lamp tube 3 and the second ultraviolet lamp tube 4, and curing liquid with the thickness of 2mm is coated on the baffles 5 which are close to the first ultraviolet lamp area and the second ultraviolet lamp area; and finally, the movable cabinet body device is installed in the vehicle-mounted air conditioning system.
(2) The fan 2 is used from the air inlet 101 according to the 0.2m 3 The air to be purified is sent to a first ultraviolet lamp area formed by a first ultraviolet lamp tube 3; the first ultraviolet lamp 3 in the first ultraviolet lamp tube region acts on the air to be purified to generate ozone, and the catalytic film covered on the surface of the baffle 6 close to the first ultraviolet lamp tube region performs photocatalytic reaction under the action of the first ultraviolet lamp 3 to generate active free radicals with the total molar concentration of 100 mu mol/L, wherein the active free radicals comprise hydroxide ions (OH) and negative oxygen ions (O) 2 - ) The air to be purified is sterilized for the first time under the combined action of ozone and active free radicals;
(3) the air after primary sterilization is sent to the second ultraviolet lamp tube region from the gap of the baffle 6 under the action of the fan, and secondary sterilization is carried out under the action of the second ultraviolet lamp tube 4; meanwhile, the second ultraviolet lamp tube 4 acts on residual ozone in the primary sterilized air to reduce the residual ozone into oxygen; the catalytic film covered on the surface of the baffle 6 near the second ultraviolet lamp tube region generates a photocatalytic reaction under the action of the second ultraviolet lamp 4 to generate active free radicals, and secondary sterilization is carried out on the air to be purified through the combined action of ozone and the active free radicals.
(4) The air after the secondary sterilization carries negative oxygen ions and is sent out from the air outlet 102, and then purified air can be obtained.
The first ultraviolet lamp tube 3 and the second ultraviolet lamp tube 4 are both LED ultraviolet lamps, and a core light source of the LED ultraviolet lamps is a light emitting diode prepared on the basis of gallium nitride. The ultraviolet lamp circuit is controlled by a microcomputer time control switch integrated in the running vehicle, and the starting time and the starting duration of the ultraviolet lamp can be set.
The preparation method of the curing liquid comprises the following steps:
b1: dissolving 5 parts of epoxidized soybean oil acrylate with the mass concentration of 10% and 2 parts of photoinitiator with the mass concentration of 4% in ethyl acetate according to the mass part ratio to obtain a photoreaction solution; the photoinitiator is Irgacure 819.
B2: adding 3 parts of photoreaction solution and 1.5 parts of modified corn starch into 100 parts of distilled water, uniformly mixing, then adding 0.5 part of glycerol and 0.05 part of nano titanium dioxide powder, uniformly mixing, adjusting the pH value to 8.0, and magnetically stirring for 30min to obtain a curing solution.
The preparation method of the modified corn starch comprises the following steps:
d1: weighing 25 parts of dry corn starch according to the mass part ratio, adding 37.5 parts of alkaline sodium chloride solution, and fully stirring until the corn starch is completely dissolved to obtain a mixed solution; the alkaline sodium chloride solution is prepared by dissolving 0.9 part of sodium hydroxide and 1.5 parts of sodium chloride in 50 parts of water according to the mass ratio.
D2: and (3) stirring the mixed solution in a constant-temperature water bath at 50 ℃, adding 2 parts of epoxy chloropropane alkaline solution, and reacting for 8 hours to obtain a reaction solution.
D3: and (3) adjusting the pH of the reaction solution to 7.0 by using 1mol/L hydrochloric acid solution, centrifuging for 5min at 4000r/min, and drying the lower-layer precipitate at 55 ℃ for 6h to obtain the modified corn starch.
Use the device of this embodiment and indoor small-size air conditioner combine together, through handling the back, detect indoor small-size air conditioner air-out air quality, wherein: inhalable particulate contaminantsThe concentration is 0.025 mg/m 3 PM2.5 concentration value of 0.001 mg/m 3 The formaldehyde concentration is 0 mg/m 3 CO concentration of 0 mg/m 3 。
After the cured film of the embodiment is used for 10 times after being dissolved and cured by glass, the transmittance of ultraviolet light is increased by 3%, and the photocatalytic efficiency (formaldehyde degradation efficiency) is reduced by 4%.
Example 3
A novel indoor air purification method comprises the following steps:
(1) a fan, an ultraviolet lamp tube and a movable cabinet device are arranged in the movable cabinet device, the movable cabinet device is shown in figures 1 and 2 and comprises a box body 1, an air inlet 101 is formed in one side of the bottom of the box body 1, and an air outlet 102 is formed in one side of the top of the box body; a fan 2, a first ultraviolet lamp tube 3 and a second ultraviolet lamp tube 4 are sequentially arranged in the box body 1 from bottom to top; the first ultraviolet lamp tube 3 is arranged on the wall of the box body 1, and the second ultraviolet lamp tube 4 is vertically arranged between the two walls of the box body 1;
The first ultraviolet lamp tubes 3 are arranged side by side, the wavelength is 185nm, the power is 80W, and the radiation intensity is 200 mu W/cm 2 (ii) a The second ultraviolet lamp tubes 4 are arranged side by side and are vertical to the first ultraviolet lamp tubes to form at least 2 rows of grids, the wavelength is 253.7nm, the power is 120W, and the radiation intensity is 350 mu W/cm 2 (ii) a Baffles 5 which are obliquely and alternately arranged are arranged between the first ultraviolet lamp tube 3 and the second ultraviolet lamp tube 4, and catalytic films with the thickness of 2mm are coated on the baffles 5 which are close to the first ultraviolet lamp area and the second ultraviolet lamp area; finally, the movable cabinet body device is arranged in an air inlet device of an indoor floor air conditioner;
(2) the fan 2 is used from the air inlet 101 according to the 0.2m 3 The air to be purified is sent to a first ultraviolet lamp area formed by a first ultraviolet lamp tube 3, the first ultraviolet lamp tube 3 in the first ultraviolet lamp tube area acts on the air to be purified to generate ozone, and meanwhile, a catalytic film covered on the surface of a baffle plate 6 close to the first ultraviolet lamp tube area performs a photocatalytic reaction under the action of the first ultraviolet lamp tube 3 to generate active free radicals with the total molar concentration of 80 mu mol/L, wherein the active free radicals comprise hydroxyl ions (OH) and negative oxygen ions (O) 2 - ) The air to be purified is sterilized once through the combined action of the ozone and the active free radicals.
(3) The air after primary sterilization is sent to the second ultraviolet lamp tube region from the gap of the baffle 6 under the action of the fan, and secondary sterilization is carried out under the action of the second ultraviolet lamp tube 4; meanwhile, the second ultraviolet lamp tube 4 acts on residual ozone in the primary sterilized air to reduce the residual ozone into oxygen; the catalytic film covered on the surface of the baffle 6 near the second ultraviolet lamp tube region generates a photocatalytic reaction under the action of the second ultraviolet lamp 4 to generate active free radicals, and secondary sterilization is carried out on the air to be purified through the combined action of ozone and the active free radicals.
(4) The air after the secondary sterilization carries negative oxygen ions and is sent out from the air outlet 102, and then purified air can be obtained.
The first ultraviolet lamp tube 3 and the second ultraviolet lamp tube 4 are both LED ultraviolet lamps, and a core light source of the first ultraviolet lamp tube and the second ultraviolet lamp tube is a light emitting diode prepared on the basis of aluminum gallium nitride. The ultraviolet lamp circuit is controlled by a microcomputer time control switch integrated on a control panel of the floor air conditioner.
The preparation method of the catalytic film comprises the following steps:
a1: placing glass fibers in a mixed solution of sulfuric acid and hydrogen peroxide in a volume ratio of 7:3, boiling for 5min, taking out, rinsing with deionized water to be neutral, and drying to obtain pretreated glass fiber cloth; the concentrated sulfuric acid concentration is 1mol/L, and the mass part of the hydrogen peroxide is 30%;
A2: adding 0.15 part of nano titanium dioxide into 7 parts of absolute ethyl alcohol according to the mass part ratio, stirring for 30min, then adding 3 parts of modified corn starch solution, and continuing stirring for 30min to obtain solution A; according to n (vanadium) =0.02:1, dissolving ammonium metavanadate in an oxalic acid solution with the mass concentration of 5% to obtain a C solution; slowly dripping the solution B into the solution A under the stirring condition, stirring and reacting for 2 hours to obtain semitransparent sol, and then aging for 50min to obtain a catalytic solution;
a3: soaking the pretreated glass fiber cloth in a catalytic solution for 1min, and then drying at 100 ℃ for 5min to obtain a catalytic film;
the preparation method of the modified corn starch comprises the following steps:
d1: weighing 25 parts of dry corn starch according to the mass part ratio, adding 37.5 parts of alkaline sodium chloride solution, and fully stirring until the corn starch is completely dissolved to obtain a mixed solution; the alkaline sodium chloride solution is prepared by dissolving 0.5 part of sodium hydroxide and 1.5 parts of sodium chloride in 50 parts of water according to the mass ratio.
D2: and (3) stirring the mixed solution in a constant-temperature water bath at 35 ℃, adding 2 parts of epoxy chloropropane alkaline solution, and reacting for 7 hours to obtain a reaction solution.
D3: and (3) adjusting the pH of the reaction solution to 6.8 by using 1mol/L hydrochloric acid solution, centrifuging for 5min at 4000r/min, and drying the lower-layer precipitate at 55 ℃ for 6h to obtain the modified corn starch.
The device of this embodiment applies to and removes central air conditioning system, and the driving is 2h after, detects the interior air quality of car, wherein: the inhalable particle pollutant concentration is 0.01 mg/m 3 PM2.5 concentration value of 0.001 mg/m 3 The concentration of formaldehyde is 0.02 mg/m 3 Reduced by 60% and CO concentration of 0 mg/m 3 。
The above embodiments are only exemplary embodiments of the present invention, and are not intended to limit the present invention, and the scope of the present invention is defined by the claims. Various modifications and equivalents may be made thereto by those skilled in the art within the spirit and scope of the present invention, and such modifications and equivalents should be considered as falling within the scope of the present invention.
Claims (7)
1. A novel indoor air purification method is characterized by comprising the following steps:
(1) in the movable cabinet device, a fan is utilized from an air inlet according to the length of 0.1-0.3 m 3 The air to be purified is sent to a first ultraviolet lamp tube region, a first ultraviolet lamp of the first ultraviolet lamp tube region acts on the air to be purified to generate ozone, meanwhile, a catalytic film covered on the surface of a baffle close to the first ultraviolet lamp tube region performs a photocatalytic reaction under the action of the first ultraviolet lamp to generate active free radicals, and the ozone and the active free radicals are used for generating active free radicals together The air to be purified is sterilized for the first time;
(2) the air after primary sterilization is conveyed to a second ultraviolet lamp tube region from the baffle gap under the action of a fan, and secondary sterilization is carried out under the action of the second ultraviolet lamp tube; simultaneously, the second ultraviolet lamp tube acts on residual ozone in the primary sterilized air to reduce the residual ozone into oxygen; obtaining secondary sterilized air;
(3) the air after the secondary sterilization is sent out from the air outlet, and then purified air can be obtained;
the ultraviolet lamps in the first ultraviolet lamp tube region are arranged side by side, the wavelength is 180-200 nm, the power is 10-200W, and the radiation intensity is 170-340 mu W/cm 2 ；
The ultraviolet lamps in the second ultraviolet lamp tube region are arranged side by side and are vertical to the first ultraviolet lamp tube to form at least 2 rows of grids, the wavelength is 248-260 nm, the power is 30-300W, and the radiation intensity is 200-350 mu W/cm 2 ；
The baffle plates are arranged in an upper row and a lower row and form a splayed shape, the baffle plates are fixed on the inner wall between a first ultraviolet lamp area and a second ultraviolet lamp area of the mobile device, and a catalytic film with the thickness of 1-2 mm is coated on the baffle plate close to the first ultraviolet lamp area;
the preparation method of the catalytic film comprises the following steps:
A1: arranging glass fiber in a mixed solution of concentrated sulfuric acid and hydrogen peroxide in a volume ratio of 7:3, boiling for 5min, taking out, rinsing with deionized water to be neutral, and drying to obtain pretreated glass fiber cloth; the concentrated sulfuric acid concentration is 1mol/L, and the mass fraction of the hydrogen peroxide is 30%;
a2: adding 0.1-0.2 part of nano titanium dioxide into 6-8 parts of absolute ethyl alcohol according to the mass part ratio, stirring for 30min, then adding 3-4 parts of modified corn starch solution, and continuously stirring for 30min to obtain solution A; dissolving ammonium metavanadate in an oxalic acid solution with the mass concentration of 5% to obtain a solution B; slowly dripping the solution B into the solution A under the stirring condition, stirring and reacting for 2 hours to obtain semitransparent sol, and then aging for 40-60 min to obtain a catalytic liquid;
the dosage of the ammonium metavanadate is determined by n (vanadium) = (0.01-0.03) = (n (titanium) =) 1
A3: and (3) soaking the pretreated glass fiber cloth into the catalytic solution for 1min, and then drying at 100 ℃ for 5min to obtain the catalytic film.
2. The novel indoor air purification method according to claim 1, wherein: the ultraviolet lamp with the wavelength of 180-200 nm has the power of 20-100W and the radiation intensity of 200 mu W/cm 2 (ii) a The ultraviolet lamp with the wavelength of 248-260 nm has the power of 80-150W and the radiation intensity of 350 mu W/cm 2 。
3. The novel indoor air purification method according to claim 1, wherein: the total molar concentration of the active free radicals generated in the step (1) is 10-100 mu mol/L.
4. The novel indoor air purification method according to claim 1, wherein: the surface of the baffle close to the first ultraviolet lamp tube region is coated with a catalytic film curing liquid with the thickness of 1-2 mm;
the preparation method of the curing liquid comprises the following steps:
b1: dissolving 5-10 parts of epoxidized soybean oil acrylate with the mass concentration of 10-30% and 2-4 parts of photoinitiator with the mass concentration of 4-6% in ethyl acetate according to the mass part ratio to obtain a photoreaction solution; the photoinitiator is Irgacure 819;
b2: adding 3-4 parts of photoreaction solution and 1.5-2.5 parts of modified corn starch into 100 parts of distilled water, uniformly mixing, then adding 0.5-1.5 parts of glycerol and 0.05-0.1 part of nano titanium dioxide powder, uniformly mixing, adjusting the pH value to 8.0, and magnetically stirring for 30-60 min to obtain a curing solution.
5. The novel indoor air purification method according to claim 1, wherein: the movable cabinet body device comprises a box body (1), wherein an air inlet (101) is formed in one side of the bottom of the box body (1), and an air outlet (102) is formed in one side of the top of the box body (1); a fan (2), a first ultraviolet lamp area formed by a first ultraviolet lamp tube (3) and a second ultraviolet lamp area formed by a second ultraviolet lamp tube (4) are sequentially arranged in the box body (1) from bottom to top;
The first ultraviolet lamp tube (3) is arranged on the wall of the box body (1), and the second ultraviolet lamp tube (4) is vertically arranged between the two walls of the box body (1);
a baffle (5) is arranged between the first ultraviolet lamp tube (3) and the second ultraviolet lamp tube (4); the baffles (5) are arranged in two rows and fixed on the inner wall of the box body (1); each row is provided with a plurality of baffles which are parallel to each other, and an included angle of 30-45 degrees is formed between the two rows of baffles.
6. The novel indoor air purification method according to any one of claims 1 to 5, characterized in that: the first ultraviolet lamp tube and the second ultraviolet lamp tube are both LED ultraviolet lamps.
7. The novel indoor air purification method according to claim 1 or 4, wherein: the preparation method of the modified corn starch comprises the following steps:
d1: weighing 25 parts of dry corn starch according to the mass part ratio, adding 37.5 parts of alkaline sodium chloride solution, and fully stirring until the corn starch is completely dissolved to obtain a mixed solution;
the alkaline sodium chloride solution is prepared by dissolving 0.3-0.9 part of sodium hydroxide and 1.5 parts of sodium chloride in 50 parts of water according to the mass ratio;
d2: stirring the mixed solution in a constant-temperature water bath at 30-50 ℃, adding 1-2 parts of epoxy chloropropane alkaline solution, and reacting for 6-8 hours to obtain a reaction solution;
D3: and (3) regulating the pH of the reaction liquid to 6.5-7.0 by using 1mol/L hydrochloric acid solution, centrifuging for 5min at 4000r/min, taking the lower-layer precipitate, and drying for 6h at 55 ℃ to obtain the modified corn starch.
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