CN108240687B - Deodorizing method and deodorizing device - Google Patents
Deodorizing method and deodorizing device Download PDFInfo
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- CN108240687B CN108240687B CN201711153412.9A CN201711153412A CN108240687B CN 108240687 B CN108240687 B CN 108240687B CN 201711153412 A CN201711153412 A CN 201711153412A CN 108240687 B CN108240687 B CN 108240687B
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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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- 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
- B60H3/0007—Adding substances other than water to the air, e.g. perfume, oxygen
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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
- B60H3/0085—Smell or pollution preventing arrangements
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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
- B60H3/06—Filtering
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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
- F24F8/00—Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying
- F24F8/10—Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying by separation, e.g. by filtering
- F24F8/15—Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying by separation, e.g. by filtering by chemical means
- F24F8/167—Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying by separation, e.g. by filtering by chemical means using catalytic reactions
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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
- F24F8/00—Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying
- F24F8/20—Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying by sterilisation
- F24F8/24—Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying by sterilisation using sterilising media
- F24F8/26—Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying by sterilisation using sterilising media using ozone
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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
- B60H3/06—Filtering
- B60H2003/0675—Photocatalytic filters
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- Environmental & Geological Engineering (AREA)
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- Life Sciences & Earth Sciences (AREA)
- General Chemical & Material Sciences (AREA)
- Exhaust Gas Treatment By Means Of Catalyst (AREA)
- Catalysts (AREA)
- Disinfection, Sterilisation Or Deodorisation Of Air (AREA)
- Oxygen, Ozone, And Oxides In General (AREA)
- Central Air Conditioning (AREA)
- Air-Conditioning For Vehicles (AREA)
Abstract
Provided is a deodorizing method capable of efficiently decomposing a wide range of odorous substances. Further, a deodorizing apparatus capable of implementing the deodorizing method can also be provided. The object space or the object is deodorized by supplying a mist of a dispersion liquid of a gas containing ozone and photocatalyst particles containing tungsten oxide to the object space or the object. As an apparatus for realizing such a deodorization method, there can be exemplified a deodorization apparatus (10) in which a mist of a dispersion liquid of a gas containing ozone and photocatalyst particles can be supplied in a mixed manner to the deodorization apparatus (10), comprising: an ozone generation unit (20) for generating ozone from oxygen molecules and supplying a gas containing ozone; and an atomizing unit (30) which atomizes the dispersion of the photocatalyst particles by ultrasonic waves and thereby supplies a mist of the dispersion of the photocatalyst particles.
Description
Technical Field
The present invention relates to a deodorization method and a deodorization device for deodorizing a target space or a target object.
Background
Conventionally, as a method for deodorizing spaces such as houses and automobiles or articles installed in these spaces, a method using ozone has been known. Unlike a method of masking an odor with a perfume or the like, this method is excellent in that an odorous substance itself, which is a cause of an odor, can be decomposed by the oxidizing power of ozone.
In addition, a method of deodorizing by using ozone and a photocatalyst in combination has also been proposed. For example, patent documents 1 and 2 disclose the following devices: the device is used for decomposing organic matters in the air, and is provided with an ozone generating part and a carrier for carrying a photocatalyst. The ozone generating part in patent document 1 is a lamp 50 in fig. 1 of the document, and the carrier is a photocatalyst filter 40 in the figure. The ozone generating unit in patent document 2 is the ozone generating apparatus 1 in fig. 1 of the document, and the carrier is the catalyst carrier 9 in the figure. Further, patent document 3 describes a deodorization method as follows: ozone is supplied into a chamber using a small ozone generating apparatus, and a suspension of titanium oxide powder as a photocatalyst is sprayed into the chamber.
Documents of the prior art
Patent document
Patent document 1: japanese patent laid-open No. 2001-070416
Patent document 2: japanese laid-open patent publication No. 2006-026194
Patent document 3: japanese patent laid-open publication No. 2005-329101
Disclosure of Invention
Technical problem to be solved by the invention
The method of using ozone alone may not decompose a wide range of odorous substances. Ozone is considered to be supplied at a very high concentration and for a long time as a means for solving this problem. However, there is a possibility that the human body may be badly affected or indoor articles may be easily rusted.
In addition, in the case of using the deodorizing apparatus described in patent document 1 or patent document 2, the effect of the photocatalyst can be obtained only when the gas to be treated passes through the carrier of the photocatalyst, and therefore even in the method of using the photocatalyst carried by ozone and the carrier in combination, it is not always possible to effectively decompose a wide range of odorous substances. On the other hand, it is considered that when the method described in patent document 3 is used, since titanium oxide powder is sprayed in a room, the effect of the photocatalyst can be obtained in the whole room. However, according to the study of the present inventors, in the method using ozone and titanium oxide described in patent document 3, the odor substance which is difficult to decompose cannot be decomposed.
The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a deodorizing method capable of efficiently decomposing a wide range of odorous substances. It is also an object of the present invention to provide a deodorizing device capable of implementing such a deodorizing method.
Solution for solving the above technical problem
The above technical problem is solved by a deodorization method for deodorizing a target space or an object by supplying a mist of a dispersion liquid of a gas containing ozone and photocatalyst particles containing tungsten oxide to the target space or the object.
This enables efficient decomposition of a wide range of odorous substances. That is, by allowing ozone to coexist with photocatalyst particles containing tungsten oxide, it is possible to efficiently decompose odorous substances that cannot be decomposed by ozone alone or photocatalyst particles alone, or can be decomposed only inefficiently, as will be described later in detail.
In the above-described deodorization method, the mist of the dispersion liquid of the photocatalyst particles and the gas containing ozone may be separately supplied, but the mist of the dispersion liquid of the photocatalyst particles and the gas containing ozone may be supplied in a mixed state. Accordingly, since the ozone and the photocatalyst particles can be supplied to the target space or the target object in a mixed state, the above-described synergistic effect of the ozone and the photocatalyst particles can be easily obtained, and the deodorization can be sufficiently performed.
On the other hand, in the above deodorization method, when the ozone-containing gas and the mist of the dispersion liquid of the photocatalyst particles are separately supplied, it is preferable that the mist of the dispersion liquid of the photocatalyst particles is supplied before the ozone-containing gas is supplied. This ensures the safety of the operator and enables efficient deodorization. For example, in a place where odor substances are likely to adhere, such as a curtain in a room or a seat cushion in a car, when an operator enters the room or the car and emphatically supplies a mist of a dispersion liquid of photocatalyst particles, deodorization can be performed more efficiently. However, since ozone is harmful to the human body, there is a possibility that an operator cannot safely supply photocatalyst particles by supplying photocatalyst particles after supplying a gas containing ozone.
In the above-described deodorizing method, the odor substance as the target of deodorization is not particularly limited. However, when the odorous substance in the target space or the target object contains an aromatic compound, it is preferable that the aromatic compound is decomposed to deodorize the target space or the target object. Among various odorous substances, aromatic compounds are often difficult to decompose, regardless of whether they are responsible for most of malodors. By using the deodorization method of the present invention, the aromatic compound can be decomposed as described below.
The deodorization method of the present invention can be realized by a deodorization device capable of mixedly supplying a mist of a dispersion liquid of photocatalyst particles and a gas containing ozone, the deodorization device including: an ozone generating unit for generating ozone from oxygen molecules and supplying a gas containing ozone; the atomizing unit atomizes the dispersion of the photocatalyst particles by ultrasonic waves to supply a mist of the dispersion of the photocatalyst particles. This enables more effective deodorization and the like in the room. This is also because the use of the deodorizing device makes it possible to supply ozone and photocatalyst particles in a mixed state to a target space or a target object, and thus, a wide range of odorous substances can be sufficiently decomposed.
Effects of the invention
As described above, the present invention can provide a deodorizing method capable of efficiently decomposing a wide range of odorous substances. Further, a deodorizing device capable of realizing the deodorizing method can also be provided.
Drawings
Fig. 1 is a schematic view showing an example of a deodorization apparatus capable of implementing the deodorization method of the present invention.
Detailed Description
The present invention provides a method for deodorizing a target space or an object by supplying a mist of a dispersion liquid of a gas containing ozone and photocatalyst particles containing tungsten oxide to the target space or the object.
This enables efficient decomposition of a wide range of odorous substances. That is, the odor substance which cannot be decomposed or can be decomposed only inefficiently by ozone alone or photocatalyst particles alone can be decomposed effectively. For example, when the deodorization treatment is performed with ozone alone, aldehydes among odorous substances, substances contained in tar of cigarettes, and the like are oxidized to generate carboxylic acids, and the carboxylic acids are hardly decomposed by the oxidation of ozone, so that sour taste is generated on the contrary. In addition, among odorous substances, many aromatic compounds are difficult to decompose. In this regard, the deodorizing method of the present invention is a method capable of decomposing a wide range of odorous substances including carboxylic acids or aromatic compounds by the interaction of ozone and photocatalyst particles including tungsten oxide.
The target space in the above-described deodorization method is a space having a certain volume partitioned by a wall or the like. Examples of such a space include a house and an interior of a vehicle. The above-described deodorization method can be preferably used for deodorization in a hotel room, a car room, or the like. The object in the above-described deodorization method is an article existing in the target space. Examples of such articles include interior materials such as wallpaper and car seats, and portable articles such as furniture and bedding. Although the material of the object is not particularly limited, the above-described deodorizing method can be preferably used when deodorizing an object formed of a material to which odor substances such as fibers are likely to adhere. Examples of such objects include curtains and carpets. In addition, when the deodorization treatment is performed by using the above-described deodorization method, since the effect of the photocatalyst can be promoted if the light is irradiated to the target space or the target object, it is preferable to irradiate the target space with a light source such as a fluorescent lamp, an LED lamp, or an incandescent lamp, or to allow natural light to enter the target space from a window or the like.
In the above-described deodorization method, if the gas containing ozone is a gas containing ozone molecules in a gaseous state, the specific composition thereof is not particularly limited. Although the gas containing ozone may be a gas composed almost only of ozone, it generally refers to air containing ozone.
In the above-described deodorization method, a method of supplying mist of a dispersion liquid of photocatalyst particles containing tungsten oxide (hereinafter, sometimes referred to simply as "photocatalyst particles") is not particularly limited. The mist of the dispersion of the photocatalyst particles can also be supplied by atomizing the dispersion of the photocatalyst particles using, for example, ultrasonic waves. In this case, since the mist of the dispersion liquid of the photocatalyst particles can be supplied to the target space over the entire surface, the deodorization can be efficiently and sufficiently performed. Alternatively, the dispersion of photocatalyst particles may be sprayed by a manual or electric spraying device to supply a mist of the dispersion of photocatalyst particles. In this case, since the mist of the dispersion liquid of the photocatalyst particles can be locally sprayed, the odor can be intensively deodorized to a portion of a particularly odorous gas in the target space or the target object.
The dispersion of the photocatalyst particles can be adjusted by dispersing the photocatalyst particles in a dispersion medium of a liquid phase. The composition of the dispersion medium is not particularly limited, but is preferably a solution mainly composed of water, ethanol, or a mixture thereof. Additives such as dispersants or preservatives may also be added to the dispersion medium. Examples of the dispersant include various surfactants, salts, solvents, and polymer compounds.
The amount of the photocatalyst particles contained in the dispersion of photocatalyst particles is not particularly limited. However, if the amount of the photocatalyst particles is too small, the deodorizing effect tends to be reduced. Therefore, the amount of the photocatalyst particles contained in the dispersion liquid is preferably 0.001% (mass volume percentage. hereinafter, referred to as "w/v") or more, more preferably 0.01% (w/v) or more, and still more preferably 0.05% (w/v) or more. On the other hand, if the amount of the photocatalyst particles contained in the dispersion is too large, the photocatalyst particles may be easily precipitated in the dispersion. Therefore, the amount of the photocatalyst particles contained in the dispersion liquid is preferably 20% (w/v) or less, more preferably 10% (w/v) or less, and still more preferably 5% (w/v) or less.
The photocatalyst particles containing tungsten oxide are not particularly limited in their specific composition if they are particles containing tungsten oxide particles. The tungsten oxide forming the tungsten oxide particles is not particularly limited in oxidation number or composition if it is a compound containing tungsten and oxygen as constituent elements, but is usually tungsten dioxide (WO)2) Or tungsten trioxide (WO)3). The tungsten oxide particles may be a mixture of two or more types of tungsten oxide particles having different oxidation numbers or compositions. The crystal structure of tungsten oxide is not particularly limited.
The photocatalyst particles containing tungsten oxide may contain other photocatalyst particles in addition to the tungsten oxide particles. Examples of the other photocatalyst particles include particles of titanium oxide, zinc sulfide, cadmium sulfide, or the like. When titanium oxide particles are used, any of anatase type, rutile type, and brookite type can be used, but the use of anatase type titanium oxide particles is preferable because higher photocatalytic activity can be obtained. The metal compound may be supported on tungsten oxide particles or other photocatalyst particles. Examples of such a metal compound include one or more metal compounds selected from the group consisting of titanium, platinum, iron, silver, copper, lead, nickel, rhodium, ruthenium, and palladium.
The particle diameter of the tungsten oxide particles or other photocatalyst particles contained in the dispersion of photocatalyst particles is not particularly limited, but is preferably small. This is because if the particle diameter of the photocatalyst particles is made smaller, the flight time of the photocatalyst particles can be made longer when the mist of the dispersion liquid of the photocatalyst particles is supplied to the target space, and hence the target space can be deodorized more efficiently. Further, since the specific surface area of the photocatalyst particles can be increased, the space to be deodorized or the object can be efficiently deodorized.
Therefore, the particle diameter of the photocatalyst particles is preferably 50nm or less, more preferably 30nm or less, and still more preferably 10nm or less. The lower limit of the particle diameter of the photocatalyst particles is not particularly limited, but is usually about 1 nm. The particle diameter of the photocatalyst particles is preferably 3nm or more, more preferably 5nm or more. In the examples described later, photocatalyst particles having a particle diameter of about 7nm were used.
In the above-described deodorization method, the gas containing ozone and the mist of the dispersion liquid of photocatalyst particles may be supplied to the target space or the target in a mixed state. Examples of such a method include a method using a deodorizing device described later.
In the above-described deodorization method, the gas containing ozone and the mist of the dispersion liquid of the photocatalyst particles may be supplied to the target space or the target object, respectively. In this case, it is not particularly limited to which of the ozone-containing gas and the mist of the dispersion liquid of photocatalyst particles is supplied first, and the ozone-containing gas and the mist of the dispersion liquid of photocatalyst particles may be supplied simultaneously.
The above-mentioned deodorizing method can decompose various odor substances causing odor. Examples of such odorous substances include one or more organic compounds selected from the group consisting of various aromatic compounds, carboxylic acids, aldehydes, alcohols, esters, ethers, ketones, lactones, nitrogen compounds, sulfur compounds, chlorine compounds, and bromine compounds. In particular, the above-mentioned deodorizing method can efficiently decompose aromatic compounds. Examples of the aromatic compound include at least one compound selected from the group consisting of benzene, styrene, toluene, xylene, phenol, cresol, naphthalene, indole, methylindole, pyridine, and derivatives thereof.
The above-described deodorization method can be realized by using the deodorization device 10 shown in fig. 1, for example. The deodorizing device 10 includes: an ozone generating unit 20 for generating ozone from oxygen molecules and supplying a gas containing ozone; the atomizing unit 30 atomizes the dispersion liquid D of the photocatalyst particles by ultrasonic waves to supply mist of the dispersion liquid of the photocatalyst particles. By using the deodorization device 10, ozone and photocatalyst particles can be supplied into the target space over the entire surface, and effective and sufficient deodorization can be performed. Further, since the deodorization treatment can be performed in an unmanned state, the labor can be saved and the exposure of the operator to harmful ozone can be prevented.
The deodorizing device 10 is not particularly limited as to how to combine the ozone generating unit 20 and the atomizing unit 30 if they are provided. For example, the ozone generating unit 20 and the atomizing unit 30 may be disposed in different flow paths, and discharge ports connected to the outside of the apparatus may be provided in the respective flow paths to supply the ozone-containing gas and the mist of the dispersion liquid of the photocatalyst particles, respectively. However, in the deodorization device 10 shown in fig. 1, the ozone generation unit 20 and the atomization unit 30 are disposed in 1 flow path, and the mist of the dispersion liquid of the gas containing ozone and the photocatalyst particles is supplied in a mixed state. That is, the air sucked in from the air inlet 50 by the blower 40 passes through both the ozone generating unit 20 and the atomizing unit 30, and is discharged from the discharge port 60 in a state of containing a mist of the dispersion of the ozone and the photocatalyst particles. This makes it possible to supply ozone and photocatalyst particles in a premixed state, and therefore, the ozone and photocatalyst particles can be more easily caused to interact with each other, and a wide range of odorous substances can be sufficiently decomposed.
When ozone generating unit 20 and atomizing unit 30 are disposed in 1 flow path, it is not particularly limited which of ozone generating unit 20 and atomizing unit 30 is disposed on the upstream side, but it is preferable that ozone generating unit 20 is disposed on the upstream side with respect to atomizing unit 30 as shown in fig. 1. This is because, when the gas flowing downstream of the atomizing area 30 contains a large amount of water vapor generated by atomizing the dispersion liquid D of photocatalyst particles, if ozone is generated in the gas containing a large amount of water vapor, not only ozone but also OH radicals derived from water molecules are generated, and the efficiency of ozone generation is reduced.
The specific structure of the ozone generating unit 20 is not particularly limited as long as it can generate ozone from oxygen molecules, and it may be a structure using an ultraviolet lamp or the like, or a structure of a creeping discharge type, a corona discharge type, or a plasma type, and the ozone generating unit 20 in the deodorization device 10 shown in fig. 1 generates ozone by silent discharge. Further, the method of supplying oxygen molecules as a raw material of ozone is not particularly limited, and concentrated oxygen gas supplied from a gas bomb or the like may be used. In this case, ozone can be generated at a high concentration, and therefore, a better deodorization effect can be obtained. The ozone generating unit 20 in the deodorizing device 10 shown in fig. 1 generates ozone by using oxygen molecules contained in the air sucked from the suction port 50 as a raw material. In this case, the apparatus is simple, and the cost can be controlled to be low.
The specific configuration of the atomizing unit 30 is not particularly limited if the dispersion liquid D of photocatalyst particles can be atomized by ultrasonic waves. In the deodorizing device 10 shown in fig. 1, an ultrasonic vibrator 31 is provided at the bottom of the atomizing unit 30.
The deodorizing device 10 shown in fig. 1 includes, in addition to the above-described structure, a photocatalyst filter 70 formed by supporting a photocatalyst on a carrier. This enables more effective deodorization. In the deodorizing device 10 shown in fig. 1, a photocatalyst filter 70 is provided on the upstream side of the blower 40, i.e., immediately after the air inlet 50. However, the photocatalyst filter 70 is not particularly limited to which part of the flow path of the deodorization device 10 is provided, and may be provided between the blower 40 and the ozone generation unit 20, between the ozone generation unit 20 and the atomization unit 30, or on the downstream side of the atomization unit 30.
The structure of the carrier of the photocatalyst filter 70 is not particularly limited as long as it is a carrier through which a gas can pass in a state in which the photocatalyst is supported, but a porous structure is preferable. Examples of such a structure include a honeycomb structure, a mesh structure, a sponge structure, and a nonwoven fabric type structure. The material of the carrier of the photocatalyst filter 70 is also not particularly limited, and ceramics, metals, resins, glass fibers, or the like can be used. The photocatalyst supported by the photocatalyst filter 70 is not particularly limited in kind, and may be titanium dioxide, tungsten trioxide, tungsten dioxide, zinc oxide, zinc sulfide, cadmium sulfide, or a mixture thereof.
When the photocatalyst filter 70 is provided in the deodorizing device 10, it is preferable that the photocatalyst effect be enhanced by irradiating light onto the photocatalyst filter 70 at least during the use of the deodorizing device 10. Therefore, the deodorizing device 10 may further include a light source (not shown) for irradiating the photocatalyst filter 70 with light. As light source, for example, a fluorescent lamp, an LED lamp, an incandescent lamp or an ultraviolet lamp can be used. Alternatively, when the photocatalyst filter 70 is disposed at the upstream end or the downstream end of the flow path of the deodorizing device 10, the photocatalyst filter 70 may be exposed to the outside of the device, and the light in the target space may be irradiated to the photocatalyst filter 70.
Examples
The present invention will be described in more detail with reference to the following examples, but the present invention is not limited to these examples.
In the present embodiment, an odorant to be treated (hereinafter, sometimes referred to as "target substance") is preliminarily allowed to exist in a target space, and the target space is subjected to a deodorizing treatment according to any one of treatment methods 1 to 8 described later, thereby deodorizing the target space. The treatment rate of the target substance was investigated to evaluate the deodorizing effect.
[ target space and target substance ]
The interior of the dryer of 45L was used as the target space. As the target substances, acetic acid was used as an example of carboxylic acid and benzene was used as an example of aromatic compound in example 1 and example 2, respectively. The target substances are volatilized from a liquid state to a saturated state in a separate container at room temperature in advance, and the gas in the separate container is sucked by a syringe and injected into the dryer, so that the target substances are present in the dryer in a gas state.
[ deodorization treatment ]
The target space in which the target substance is present is subjected to any one of the following treatment methods 1 to 8, and thereby the deodorization treatment is performed. The treatment time was 30 minutes.
(1) Treatment method 1
0.36ml of distilled water was sprayed into the target space using a manual spray device.
(2) Treatment method 2
A silent discharge type ozone generating device provided in advance in a target space is activated to supply ozone into the target space. The total amount of ozone supplied during the treatment time was 11.5mg (the same applies to the treatment methods 4, 6, and 8 described below).
(3) Treatment method 3
0.36ml of a 1% (w/v) dispersion of titanium dioxide particles was sprayed into the target space using a manual spray device.
(4) Treatment method 4
While a silent discharge type ozone generating apparatus previously provided in the target space was started, 0.36ml of a 1% (w/v) dispersion of titanium dioxide particles was sprayed into the target space using a manual spraying apparatus.
(5) Treatment method 5
0.45ml of a 0.1% (w/v) tungsten trioxide particle dispersion was sprayed into the target space using a manual spray device.
(6) Treatment method 6
While a silent discharge type ozone generating apparatus provided in advance in the target space was started, 0.45ml of a 0.1% (w/v) tungsten trioxide particle dispersion was sprayed into the target space using a manual spraying apparatus.
(7) Processing method 7
0.45ml of a 0.1% (w/v) tungsten dioxide particle dispersion was sprayed into the target space using a manual spray device.
(8) Treatment method 8
While a silent discharge type ozone generating apparatus previously provided in the target space was started, 0.45ml of a 0.1% (w/v) tungsten dioxide particle dispersion was sprayed into the target space using a manual spraying apparatus.
[ evaluation method ]
The concentration of the target substance in the air in the dryer before and after the deodorization treatment was measured, and the deodorization effect was evaluated by calculating the treatment rate (%) of the target substance. The detection tube was attached to a gas collector "MODEL 801" manufactured by gas technology corporation (Gastec) to measure the concentration of a target substance in air. The concentration of acetic acid was measured using a measuring tube "# 81L" manufactured by the company, and the concentration of benzene was measured using a measuring tube "# 121L" manufactured by the company, respectively. When the treatment rate was less than 10%, the treatment rate was determined to be "x", when the treatment rate was not less than 10% and less than 50%, the treatment rate was determined to be "Δ", when the treatment rate was not less than 50% and less than 90%, the treatment rate was determined to be "o", and when the treatment rate was not less than 90%, the treatment rate was determined to be "excellent".
[ example 1]
The above-described treatment methods 1 to 8 were carried out for each of the space inside the dryer containing about 3.77 to 9.00ppm of acetic acid, and the deodorizing effect was evaluated. The results obtained are shown in table 1. In contrast, acetic acid was hardly decomposed when ozone was supplied to the target space (test example 2), and was almost completely decomposed when the mist of the dispersion liquid of the photocatalyst particles was supplied to the target space (test examples 3, 5, and 7) and when the mist of the dispersion liquid of the photocatalyst particles and ozone were supplied (test examples 4, 6, and 8). In addition, although the acetic acid concentration was also found to be reduced in the case of supplying distilled water to the target space (test example 1), it is considered that this is because acetic acid present in the target space in a gaseous state is partially dissolved in water used for the treatment, and the air concentration of acetic acid is reduced.
Thereby showing: (1) carboxylic acids are difficult to decompose in the treatment with ozone alone; (2) in the treatment using the photocatalyst particles, the carboxylic acid can be efficiently decomposed regardless of the presence or absence of ozone.
[ Table 1]
[ example 2]
The above-mentioned treatments 1 to 8 were carried out for each of the space inside the dryer containing about 2.50 to 3.67ppm of benzene, and the deodorizing effect was evaluated. The results obtained are shown in table 2. When distilled water (test example 9) or ozone (test example 10) was supplied to the target space, benzene was hardly decomposed. Further, in the case where the mist of the titania particle dispersion was supplied to the target space (test example 11), or in the case where the mist of the titania particle dispersion and ozone were supplied (test example 12), benzene decomposition could not be recognized. On the other hand, although benzene was hardly decomposed in the case where the tungsten trioxide particle dispersion liquid was supplied to the target space (test example 13), benzene was decomposed in about 57% in the case where the mist of the tungsten trioxide particle dispersion liquid and ozone were supplied to the target space (test example 14). In addition, when the mist of the tungsten dioxide particle dispersion was supplied to the target space (test example 15), about 28% of benzene was decomposed, and when the mist of the tungsten dioxide particle dispersion and ozone were supplied to the target space (test example 16), about 67% of benzene was decomposed.
Thereby showing: (1) in the treatment using ozone alone, aromatic compounds are difficult to decompose; (2) in the treatment using titanium dioxide particles, the aromatic compound is hardly decomposed with or without ozone; (3) although it is difficult to decompose the aromatic compound when the tungsten trioxide particles are used alone, the aromatic compound can be decomposed in the presence of ozone; (4) although the tungsten dioxide particles alone can decompose the aromatic compound, the aromatic compound can be more efficiently decomposed in the coexistence of ozone.
[ Table 2]
[ example 3]
Will house the room (volume about 30 m)3Left and right) as the target space, the same deodorizing treatment experiment as in test examples 6, 8, 14 and 16 was performed using the deodorizing apparatus shown in fig. 1. As a result, ozone and photocatalyst particles are supplied to the entire surface of the room, and odor substances including carboxylic acids and aromatic compounds can be decomposed.
Description of the reference numerals
10 deodorizing device
20 ozone generating part
30 atomizing part
31 ultrasonic vibrator
40 blower
50 air inlet
60 discharge port
70 photocatalyst filter
D dispersion of photocatalyst particles
Claims (1)
1. A deodorization method for deodorizing a target space or an object by supplying a mist of a dispersion liquid of a gas containing ozone and photocatalyst particles containing tungsten oxide to the target space or the object,
supplying a mist of the dispersion of the photocatalyst particles prior to supplying the ozone-containing gas,
in the region where the odor substance is likely to adhere, the operator enters the target space and emphatically supplies the mist of the dispersion liquid of the photocatalyst particles,
the odorant in the target space or the object contains a carboxylic acid and an aromatic compound, and the carboxylic acid and the aromatic compound are decomposed by allowing ozone to coexist with photocatalyst particles containing tungsten oxide, thereby deodorizing the target space or the object.
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| JP2016-252392 | 2016-12-27 | ||
| JP2016252392A JP7218841B2 (en) | 2016-12-27 | 2016-12-27 | Deodorizing method and deodorizing device |
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| CN108240687A CN108240687A (en) | 2018-07-03 |
| CN108240687B true CN108240687B (en) | 2022-01-11 |
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| JP (1) | JP7218841B2 (en) |
| CN (1) | CN108240687B (en) |
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| JP7453646B2 (en) * | 2019-12-26 | 2024-03-21 | 青島海爾洗衣机有限公司 | deodorizing device |
| JP2022035489A (en) * | 2020-08-21 | 2022-03-04 | 青島海爾洗衣机有限公司 | Deodorizing device |
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| Publication number | Publication date |
|---|---|
| CN108240687A (en) | 2018-07-03 |
| JP7218841B2 (en) | 2023-02-07 |
| HK1250777A1 (en) | 2019-01-11 |
| JP2018102622A (en) | 2018-07-05 |
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