JP2018102622A - Deodorization method and deodorization device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a deodorization method capable of decomposing a wide range of odor materials at good efficiency, and a deodorization device capable of achieving such deodorization method.SOLUTION: By supplying gas containing ozone and fog of dispersion of photocatalyst particles containing tungsten oxide to an objective space or an object, deodorization of the objective space or the object is conducted. An example of devices for achieving the deodorization method includes a deodorization device 10 having an ozone generation part 20 for supplying gas containing ozone by generating ozone from oxygen molecules and an atomization part 30 for supplying fog of the dispersion of the photocatalyst particles by atomizing the dispersion of the photocatalyst particles with ultrasonic wave, and capable of mixing and supplying the gas containing ozone and the fog of the dispersion of the photocatalyst particles.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a deodorizing method and a deodorizing apparatus for deodorizing a target space or an object.

  2. Description of the Related Art Conventionally, a method using ozone is known as a method for deodorizing a space in a house, an automobile, or the like or an object provided in these spaces. This method is excellent in that the odor substance itself that causes the odor can be decomposed by the oxidizing power of ozone, unlike the case where the odor is deceived by a fragrance or the like.

  In addition, a method of deodorizing by using ozone and a photocatalyst together has been proposed. For example, Patent Document 1 and Patent Document 2 describe apparatuses for decomposing organic substances in the air, each of which includes an ozone generation unit and a carrier carrying a photocatalyst. ing. The ozone generating part in Patent Document 1 is the lamp 50 in FIG. 1 of the same document, and the carrier is the photocatalytic filter 40 in FIG. The ozone generator in Patent Document 2 is the ozone generator 1 in FIG. 1 of the same document, and the carrier is the catalyst carrier 9 in FIG. Patent Document 3 describes a deodorization method in which ozone is supplied into a room using a small ozone generator and a suspension of titanium oxide powder as a photocatalyst is sprayed into the room.

JP 2001-070416 A JP 2006-026194 A JP-A-2005-329101

  The above-described method using ozone alone may not be able to decompose a wide range of odorous substances. As a means for solving this problem, it is conceivable to supply ozone at a very high concentration for a long time. However, there is a possibility that the human body may be adversely affected, and indoor equipment may be easily rusted.

  In addition, when the deodorizing apparatus described in Patent Document 1 or Patent Document 2 is used, the effect of the photocatalyst can be obtained only when the gas to be treated passes through the photocatalyst carrier. Even if a method using a photocatalyst in combination is adopted, a wide range of odorous substances cannot always be efficiently decomposed. On the other hand, when the method described in Patent Document 3 is used, titanium oxide powder is sprayed into the room, so that the photocatalytic effect can be obtained everywhere in the room. However, according to a study by the inventors of the present invention, the method using ozone and titanium oxide described in Patent Document 3 could not decompose even a hardly decomposable odor substance.

  The present invention has been made to solve the above-described problems, and provides 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 apparatus that can realize such a deodorizing method.

  The above-described problem is achieved by a deodorizing method for deodorizing the target space or the target object by supplying a gas containing ozone and a mist of a dispersion of photocatalyst particles containing tungsten oxide to the target space or the target object. Solve.

  Thereby, a wide range of odorous substances can be efficiently decomposed. That is, as will be described in detail later, by coexisting ozone and 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 with low efficiency. Will be able to.

  In the deodorization method described above, the ozone-containing gas and the photocatalyst particle dispersion mist may be separately supplied. However, the ozone-containing gas and the photocatalyst particle dispersion mist may be supplied separately. Can also be supplied in a mixed state. Thereby, since ozone and photocatalyst particles can be supplied to the target space or object in a mixed state, the synergistic effect between the ozone and the photocatalyst particles can be easily obtained, and deodorization can be performed evenly. it can.

  On the other hand, in the deodorizing method described above, when separately supplying the gas containing ozone and the mist of the dispersion liquid of the photocatalyst particles, before supplying the gas containing ozone, It is preferable to supply a mist of the dispersion. Thereby, deodorization can be performed efficiently while ensuring the safety of the worker. For example, for places where odorous substances are likely to adhere, such as curtains in the room or car seats, the worker can enter the room or in the car and supply the mist of the dispersion liquid of photocatalyst particles. Deodorizing can be performed more effectively. However, since ozone is harmful to the human body, if the photocatalyst particles are supplied after the gas containing ozone is supplied, the operator may not be able to safely supply the photocatalyst particles.

  In the deodorizing method described above, the odorous substance that is the target of deodorization is not particularly limited. However, when the odorous substance in the object space or the object contains an aromatic compound, it is preferable to deodorize the object space or the object by decomposing the aromatic compound. Among various odorous substances, aromatic compounds are often hardly decomposable, although they cause many bad odors. By using the deodorizing method of the present invention, the aromatic compound can also be decomposed as described later.

  The deodorizing method of the present invention includes, for example, an ozone generating unit that supplies ozone-containing gas by generating ozone from oxygen molecules, and a photocatalyst particle dispersion by atomizing the photocatalyst particle dispersion by ultrasonic waves. It can be realized by a deodorizing device that includes an atomizing unit that supplies mist, and that can mix and supply a gas containing ozone and a mist of a dispersion of photocatalyst particles. Thereby, deodorizing indoors etc. can be performed more efficiently. This is because by using the deodorizing device, ozone and photocatalyst particles can be mixed and supplied to the target space or object, so that a wide range of odorous substances can be decomposed evenly. is there.

  As described above, according to the present invention, it is possible to provide a deodorizing method capable of efficiently decomposing a wide range of odorous substances. It is also possible to provide a deodorizing apparatus that can realize such a deodorizing method.

It is a schematic diagram which shows the example of the deodorizing apparatus which can implement | achieve the deodorizing method of this invention.

  The deodorizing method of the present invention deodorizes the target space or object by supplying a gas containing ozone and a mist of a dispersion of photocatalyst particles containing tungsten oxide to the target space or object. Is.

  Thereby, a wide range of odorous substances can be efficiently decomposed. That is, it is possible to efficiently decompose odorous substances that cannot be decomposed by ozone alone or photocatalyst particles alone or can be decomposed only with low efficiency. For example, when deodorizing treatment is performed with ozone alone, aldehydes and substances contained in cigarette tar among odorous substances are oxidized to produce carboxylic acids, which are less susceptible to oxidative degradation by ozone. On the other hand, it causes an acidic odor. Of the odorous substances, aromatic compounds are often hardly decomposable. In this regard, the deodorizing method of the present invention can decompose a wide range of odorous substances including carboxylic acids and aromatic compounds by the interaction between ozone and photocatalyst particles containing tungsten oxide.

  The target space in the above deodorizing method refers to a space having a certain volume divided by walls or the like. Examples of such a space include a house and a vehicle interior. The above-mentioned deodorizing method can be suitably used for deodorizing particularly in a hotel room or a car interior. Moreover, the target object in said deodorizing method means the article | item in target space. Examples of these articles include interior items such as wallpaper and car seats, and movable items such as furniture and bedding. The material of the object is not particularly limited, but the above-mentioned deodorization method can be suitably used when deodorizing an object formed of a material to which odorous substances such as fibers are easily attached. Examples of such objects include curtains and carpets. When performing the deodorizing process using the above-described deodorizing method, for example, the interior of the target space is illuminated using a light source such as a fluorescent lamp, an LED lamp, or an incandescent lamp, or natural light is emitted from a window or the like in the target space. It is preferable that the light is incident on the target space or the target object, for example, because the effect of the photocatalyst can be promoted.

  In the above deodorization method, the gas containing ozone is not particularly limited as long as it is a gas containing ozone molecules in a gaseous state. The gas containing ozone may be a gas substantially composed only of ozone, but is usually air containing ozone.

  In the above deodorization method, the mist of the dispersion liquid of photocatalyst particles containing tungsten oxide (hereinafter sometimes simply referred to as “photocatalyst particles”) is not particularly limited. The mist of the dispersion liquid of the photocatalyst particles can be supplied, for example, by atomizing the dispersion liquid of the photocatalyst particles using ultrasonic waves. In this case, since the mist of the dispersion liquid of the photocatalyst particles can be supplied evenly to the target space, efficient and non-uniform deodorization can be performed. The mist of the dispersion liquid of the photocatalyst particles can also be supplied by spraying the dispersion liquid of the photocatalyst particles using a manual or electric spray device. In this case, since the mist of the dispersion liquid of the photocatalyst particles can be locally sprayed, it is possible to intensively deodorize a part of the target space or the target object that is particularly annoying.

  The dispersion of photocatalyst particles is prepared by dispersing the photocatalyst particles in a liquid phase dispersion medium. The composition of the dispersion medium is not particularly limited, but is preferably a solution mainly composed of water, alcohol or a mixture thereof. Additives such as dispersants and preservatives may be added to the dispersion medium. Examples of the dispersant include various surfactants, salts, solvents, polymer compounds, and the like.

  The amount of photocatalyst particles contained in the photocatalyst particle dispersion is not particularly limited. However, if the amount of photocatalyst particles is too small, the deodorizing effect tends to be small. For this reason, the amount of the photocatalyst particles contained in the dispersion is preferably 0.001% (mass volume percent; hereinafter referred to as “w / v”) or more, preferably 0.01% (w / v) or more. And more preferably 0.05% (w / v) or more. On the other hand, if the amount of photocatalyst particles contained in the dispersion is too large, the photocatalyst particles may be easily precipitated in the dispersion. For this reason, the amount of photocatalyst particles contained in the dispersion is preferably 20% (w / v) or less, more preferably 10% (w / v) or less, and further 5% (w / v) or less. preferable.

The specific composition of the photocatalyst particles containing tungsten oxide is not particularly limited as long as it is a particle group containing tungsten oxide particles. The tungsten oxide forming the tungsten oxide particles is not particularly limited as long as it is a compound containing tungsten and oxygen as constituent elements, but 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 and 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 other photocatalyst particles include particles of titanium oxide, zinc oxide, zinc sulfide, cadmium sulfide and the like. When titanium oxide particles are used, any of anatase type, rutile type and brookite type may be used, but anatase type is preferable because higher photocatalytic activity can be obtained. The tungsten oxide particles and other photocatalyst particles may carry a metal compound. 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 tungsten oxide particles and other photocatalyst particles contained in the dispersion of photocatalyst particles is not particularly limited, but is preferably smaller. This is because when the particle size of the photocatalyst particles is reduced, the dwell time of the photocatalyst particles can be lengthened when the mist of the dispersion liquid of the photocatalyst particles is supplied to the target space. This is because deodorization can be performed. In addition, since the specific surface area of the photocatalyst particles can be increased, the target space and the target object can be effectively deodorized in this respect.

  For this reason, the particle diameter of the photocatalyst particles is preferably 50 nm or less, more preferably 30 nm or less, and even more preferably 10 nm or less. The particle diameter of the photocatalyst particles is not particularly limited as to the lower limit value, but is usually about 1 nm. The particle diameter of the photocatalyst particles is more preferably 3 nm or more, and further preferably 5 nm or more. In the examples described later, photocatalyst particles having a particle diameter of about 7 nm are used.

  In said deodorizing method, it can also supply to the object space or object in the state which mixed the gas containing ozone and the fog of the dispersion liquid of a photocatalyst particle. Examples of such a method include a method using a deodorizing apparatus described later.

  Moreover, in said deodorizing method, the gas containing ozone and the fog of the dispersion liquid of a photocatalyst particle can also be separately supplied with respect to object space or object. In this case, which of the gas containing ozone and the mist of the dispersion liquid of the photocatalyst particles is supplied is not particularly limited, and may be supplied simultaneously, but as described above, the gas containing ozone. If the mist of the dispersion liquid of the photocatalyst particles is supplied before supplying the liquid, it is preferable from the viewpoint of the safety of the operator.

  The above deodorizing method can decompose various odorous substances that cause odor. 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. Examples thereof include compounds. The deodorizing method described above is particularly capable of effectively decomposing aromatic compounds. Examples of such aromatic compounds include one or more compounds selected from the group consisting of benzene, styrene, toluene, xylene, phenol, cresol, naphthalene, indole, skatole, pyridine, and derivatives thereof.

  Said deodorizing method is realizable using the deodorizing apparatus 10 shown in FIG. 1, for example. The deodorizing apparatus 10 generates ozone from oxygen molecules to supply ozone-containing gas 20, and the photocatalyst particle dispersion D is atomized by ultrasonic waves to mist the photocatalyst particle dispersion. The atomization part 30 which supplies is provided. By using this deodorizing apparatus 10, ozone and photocatalyst particles can be supplied evenly into the target space, and efficient and non-uniform deodorization can be performed. Further, for example, since the deodorizing process can be performed in an unattended state, it is possible to save time and to prevent the operator from being exposed to harmful ozone.

  If the deodorizing apparatus 10 is provided with the ozone generation part 20 and the atomization part 30, how to combine these will not be specifically limited. For example, the ozone generation unit 20 and the atomization unit 30 are arranged in separate flow paths, and the discharge ports connected to the outside of the apparatus are provided in the respective flow paths, so that the gas containing ozone and the mist of the dispersion liquid of the photocatalyst particles are provided. You may make it supply separately. However, in the deodorizing apparatus 10 shown in FIG. 1, the ozone generating unit 20 and the atomizing unit 30 are arranged in one flow path, and the gas containing ozone and the mist of the dispersion liquid of the photocatalyst particles are mixed. Supply in the state. That is, the air sucked from the air inlet 50 by the blower fan 40 passes through both the ozone generating unit 20 and the atomizing unit 30 and is released in a state including both ozone and the mist of the dispersion liquid of the photocatalyst particles. It is discharged from the outlet 60. Thereby, since ozone and photocatalyst particles can be supplied in a premixed state, the interaction between ozone and photocatalyst particles is more likely to occur, and a wide range of odorous substances can be uniformly decomposed. .

  In the case where the ozone generation unit 20 and the atomization unit 30 are arranged in one flow path, it is not limited which of the ozone generation unit 20 and the atomization unit 30 is arranged upstream, but as shown in FIG. In addition, it is preferable to arrange the ozone generation unit 20 upstream of the atomization unit 30. This is because the gas flowing downstream of the atomization section 30 may contain abundant water vapor generated by the atomization of the dispersion D of photocatalyst particles, so that ozone is generated in the gas rich in water vapor. This is because not only ozone but also OH radicals derived from water molecules are generated, and the generation efficiency of ozone is reduced.

  As long as the ozone generation unit 20 can generate ozone from oxygen molecules, the specific configuration thereof is not particularly limited, and those using an ultraviolet lamp, a creeping discharge type, a corona discharge type, and the like. Alternatively, although it may be a plasma type, the ozone generator 20 in the deodorizing apparatus 10 shown in FIG. 1 generates ozone by silent discharge. In addition, the supply method of the oxygen molecules as the raw material of ozone is not particularly limited, and concentrated oxygen supplied from a cylinder or the like may be used. In this case, since ozone can be generated at a high concentration, a higher deodorizing effect can be obtained. The ozone generator 20 in the deodorizing apparatus 10 shown in FIG. 1 generates ozone using oxygen molecules contained in the air sucked from the air inlet 50 as a raw material. In this case, the apparatus can be simplified and the cost can be kept low.

  The atomization part 30 will not be specifically limited about the specific structure, if the dispersion liquid D of a photocatalyst particle can be atomized by an ultrasonic wave. In the deodorizing apparatus 10 shown in FIG. 1, the atomization part 30 is provided with the ultrasonic transducer | vibrator 31 in the bottom part.

  The deodorizing apparatus 10 shown in FIG. 1 includes a photocatalytic filter 70 formed by supporting a photocatalyst on a carrier in addition to the above configuration. Thereby, a deodorizing process can be performed more effectively. In the deodorizing apparatus 10 shown in FIG. 1, the photocatalytic filter 70 is installed on the upstream side of the blower fan 40, that is, immediately after the intake port 50. However, where the photocatalytic filter 70 is installed in the flow path of the deodorizing apparatus 10 is not particularly limited, and is between the blower fan 40 and the ozone generation unit 20, and between the ozone generation unit 20 and the atomization unit 30. Or you may install in the downstream of the atomization part 30. FIG.

  The structure of the support of the photocatalyst filter 70 is not particularly limited as long as it can pass a gas while supporting the photocatalyst, 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-like structure. The material of the carrier of the photocatalytic filter 70 is not particularly limited, and may be ceramic, metal, resin, glass fiber, or the like. The type of the photocatalyst supported on the photocatalytic filter 70 is not particularly limited, and may be titanium dioxide, tungsten trioxide, tungsten dioxide, zinc oxide, zinc sulfide, cadmium sulfide, or a mixture thereof. it can.

  When the deodorizing device 10 includes the photocatalytic filter 70, it is preferable that the photocatalytic filter 70 is exposed to light at least during use of the deodorizing device 10 because the effect of the photocatalyst can be promoted. For this reason, the deodorizing apparatus 10 can further include a light source (not shown) for illuminating the photocatalytic filter 70. As the light source, for example, a fluorescent lamp, an LED lamp, an incandescent lamp, an ultraviolet lamp, or the like can be used. As another aspect, when the photocatalytic filter 70 is disposed at the upstream end or the downstream end of the flow path of the deodorizing apparatus 10, the light in the target space hits the photocatalytic filter 70 with the photocatalytic filter 70 exposed to the outside of the apparatus. It can also be done.

  EXAMPLES Hereinafter, although an Example demonstrates this invention further more concretely, this invention is not limited to this Example.

  In the present embodiment, a processing target odor substance (hereinafter sometimes referred to as “target substance”) is made to exist in advance in the target space, and processing methods 1 to 8 described later for the target space. The target space was deodorized by performing any of the deodorizing treatments. The deodorizing effect was evaluated by examining the treatment rate of the target substance.

[Target space and target material]
As the object space, a 45L desiccator was used. As target substances, acetic acid was used as an example of carboxylic acid in Example 1, and benzene was used as an example of an aromatic compound in Example 2. These target substances are in a liquid state by volatilizing those in a liquid state to a saturated state at room temperature in a separate container, and sucking the gas in this separate container with a syringe and injecting it into the desiccator. It was made to exist within.

[Deodorization treatment]
The deodorizing process was performed by applying any of the following processing methods 1 to 8 to the target space where the target substance was present. The treatment time was 30 minutes.
(1) Processing method 1
0.36 ml of distilled water was sprayed into the target space using a manual spray device.
(2) Processing method 2
A silent discharge type ozone generator previously installed in the target space was started to supply ozone into the target space. The total amount of ozone supplied within the treatment time was 11.5 mg (the same applies to the following treatment methods 4, 6, and 8).
(3) Processing method 3
0.36 ml of 1% (w / v) titanium dioxide particle dispersion was sprayed into the target space using a manual spray device.
(4) Processing method 4
At the same time as starting the silent discharge type ozone generator installed in the target space in advance, 0.36 ml of 1% (w / v) titanium dioxide particle dispersion was applied to the target space using a manual spray device. Sprayed on.
(5) Processing method 5
0.45 ml of 0.1% (w / v) tungsten trioxide particle dispersion was sprayed into the target space using a manual spray device.
(6) Processing method 6
At the same time as starting the silent discharge type ozone generator installed in the target space in advance, 0.45 ml of 0.1% (w / v) tungsten trioxide particle dispersion was used with a manual spray device. Sprayed into the target space.
(7) Processing method 7
0.45 ml of 0.1% (w / v) tungsten dioxide particle dispersion was sprayed into the target space using a manual spray device.
(8) Processing method 8
At the same time as starting the silent discharge type ozone generator installed in the target space in advance, 0.45 ml of 0.1% (w / v) tungsten dioxide particle dispersion was targeted using the manual spray device. Sprayed into the space.

[Evaluation method]
Evaluation of the deodorizing effect was performed by measuring the concentration in the air of the target substance in the desiccator before and after the deodorizing process and calculating the treatment rate (%) of the target substance. The air concentration of the target substance was measured by attaching a detector tube to a gas sampling device “MODEL801” manufactured by Gastec. A detector tube “# 81L” manufactured by the same company was used for measuring the concentration of acetic acid, and a detector tube “# 121L” manufactured by the same company was used for measuring the concentration of benzene. When the processing rate is less than 10%, it is judged as “X”, when it is 10% or more and less than 50%, “△” when it is 50% or more and less than 90%, and “◎” when it is 90% or more. did.

[Example 1]
Each of the said processing methods 1-8 was given with respect to the space inside a desiccator containing about 3.77-9.00 ppm acetic acid, and the deodorizing effect was evaluated. The obtained results are shown in Table 1. When ozone was supplied to the target space (Test Example 2), acetic acid was hardly decomposed, whereas when the mist of the dispersion liquid of photocatalyst particles was supplied to the target space (Test Examples 3, 5, and 7) In both cases where the mist of the dispersion of photocatalyst particles and ozone were supplied (Test Examples 4, 6, and 8), acetic acid was almost completely decomposed. In addition, when distilled water was supplied to the target space (Test Example 1), a decrease in acetic acid concentration was also observed. This was because the acetic acid present in the target space in the gaseous state was used for the treatment. This is probably because the concentration of acetic acid in the air decreased because it was partially dissolved in the solution.

  From this, it was shown that [1] treatment with ozone alone makes it difficult to decompose carboxylic acid, and [2] treatment with photocatalyst particles can efficiently decompose carboxylic acid regardless of the presence or absence of ozone.

[Example 2]
Each of the said processing methods 1-8 was given with respect to the interior space of a desiccator containing about 2.50-3.67 ppm benzene, and the deodorizing effect was evaluated. The obtained results 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. In addition, when the mist of the titanium dioxide particle dispersion was supplied to the target space (Test Example 11) or when the mist of the titanium dioxide particle dispersion and ozone were supplied (Test Example 12), the decomposition of benzene was confirmed. Was not. On the other hand, when the mist of the tungsten trioxide particle dispersion was supplied to the target space (Test Example 13), benzene was hardly decomposed, but the mist of the tungsten trioxide particle dispersion and ozone were supplied to the target space. In the case (Test Example 14), about 57% of benzene was decomposed. When the mist of the tungsten dioxide particle dispersion is supplied to the target space (Test Example 15), about 28% of benzene is decomposed, and the mist of the tungsten dioxide particle dispersion and ozone are supplied to the target space. In (Test Example 16), about 67% of benzene was decomposed.

  From this, [1] it is difficult to decompose aromatic compounds by treatment with ozone alone, [2] it is difficult to decompose aromatic compounds with titanium dioxide particles regardless of the presence of ozone, [3] Although it is difficult for tungsten oxide particles to decompose aromatic compounds alone, it is possible to decompose aromatic compounds by coexisting with ozone. [4] Tungsten dioxide particles can also decompose aromatic compounds alone. Although it can be decomposed, it has been shown that aromatic compounds can be decomposed more efficiently by coexisting with ozone.

[Example 3]
The target space was the interior of a house (volume of about 30 m ³ ), and the same deodorizing treatment experiment as in Test Examples 6, 8, 14, and 16 was performed using the deodorizing apparatus shown in FIG. As a result, ozone and photocatalyst particles were evenly supplied into the room, and the odorous substance containing carboxylic acid and aromatic compound could be decomposed.

DESCRIPTION OF SYMBOLS 10 Deodorizing device 20 Ozone generation part 30 Atomization part 31 Ultrasonic vibrator 40 Blower fan 50 Inlet port 60 Outlet port 70 Photocatalyst filter D Dispersion liquid of photocatalyst particle

Claims (5)

  A deodorizing method for deodorizing the target space or the target object by supplying a gas containing ozone and a mist of a dispersion of photocatalyst particles containing tungsten oxide to the target space or the target object.   The deodorizing method according to claim 1, wherein the ozone-containing gas and the mist of the dispersion liquid of the photocatalyst particles are supplied in a mixed state.   The deodorization method according to claim 1, wherein the mist of the dispersion liquid of the photocatalyst particles is supplied before the gas containing ozone is supplied.   The deodorization method according to any one of claims 1 to 3, wherein the odorous substance in the target space or the target object contains an aromatic compound, and the target space or the target object is deodorized by decomposing the aromatic compound. An ozone generator that supplies ozone-containing gas by generating ozone from oxygen molecules;
An atomizing section for atomizing the dispersion of photocatalyst particles with ultrasonic waves to supply the mist of the dispersion of photocatalyst particles
A deodorizing apparatus capable of mixing and supplying a gas containing ozone and a mist of a dispersion liquid of photocatalyst particles.

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