JPH11226421A - Photocatalyst body and functional body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a photocatalyst body having a deodorizing effect which is almost free from adhering of dirt, and to provide a functional body using this catalyst. SOLUTION: This photocatalyst body consists of a substrate 1, a photocatalyst film deposited on the substrate 1, and light-transmitting fine particles 3 which selectively transmit UV rays and gas and which are deposited to cover at least the photocatalyst particles 2a on the surface side of the photocatalyst film. The substrate 1 may be a functional body intrinsically having a different function from that of the photocatalyst, and for example, it consists of the whole or a part of a building material, interior decorating material, electric appliance, lamp, illumination apparatus, dust collecting filter or the like. Or the substrate 1 may be a base body of a deodorizing filter. The light- transmitting fine particles 3 do not transmit dirt but transmit UV rays and gas, so that the photocatalyst film is activated by irradiation of UV rays to decompose and deodorize the gas being in contact with the photocayalyst. Therefore, the obtd. photocatalyst body and the functional body have a deodorizing effect and are almost free from dirt.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a photocatalyst and a functional body using the same.

[0002]

BACKGROUND OF THE INVENTION It is known to use photocatalytic films for deodorization, antifouling and / or antibacterial.

When the photocatalytic film receives ultraviolet light and absorbs its light energy, the semiconductor constituting the photocatalytic film is ionized to generate electrons and holes. The electrons and holes react with oxygen and water on the film surface to generate active oxygen,
Redoxes organic dirt and odor components.

[0004] In recent years, attention has been paid to the usefulness of photocatalyst films, and there is an active movement to form photocatalyst films on a wide range of articles, such as building materials, lighting equipment, and lamps, that is, functional bodies.

On the other hand, volatile organic compounds (VOCs) and formaldehyde have been accumulated in the room in recent years as the airtightness of houses has been increased for the purpose of energy saving, and human body damage has become a problem. The VOC and formaldehyde are mainly released from newly constructed wall materials and furniture. Formaldehyde is a colorless gas having an irritating odor, and is used as a bactericidal and preservative.

Therefore, if a photocatalytic film is formed on a functional body used indoors, for example, a light control member of a lighting fixture, the ultraviolet light contained in the light emission of the lamp is irradiated to the photocatalytic film during illumination, and the photocatalytic film is activated. VO within the room
Decomposition of C and formaldehyde is expected to solve the problem of human injury.

Now, in order to improve the deodorizing power of the photocatalytic film,
It is necessary to increase the specific surface area or area of the photocatalyst film.

[0008]

However, the photocatalyst film actually absorbs not only deodorization but also dirt. Therefore, the dirt attached to the photocatalyst film also decomposes in the region activated by irradiation with ultraviolet rays, but does not decompose the dirt attached, for example, the tobacco fat, in the region not irradiated with ultraviolet light or in the region with little irradiation. The photocatalyst film is left in a state where the photocatalyst film is formed. This means that the photocatalyst film was formed, and contaminants became rather conspicuous in part.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a photocatalyst which has a deodorizing effect and is hardly adhered to dirt, and a functional body using the same.

[0010]

The photocatalyst according to the first aspect of the present invention comprises: a substrate; a photocatalyst film adhered to the substrate; ultraviolet light adhered so as to cover at least the photocatalyst particles on the surface side of the photocatalyst film; And light-transmitting fine particles that selectively allow gas to pass therethrough.

In the present invention and each of the following inventions, definitions and technical meanings of terms are as follows unless otherwise specified.

Regarding the Substrate The substrate carries the photocatalyst film, and may be a member intended to carry the photocatalyst film, for example, a substrate of a deodorizing filter. It is also allowed to be formed. In the present invention, the latter is called a functional body.

Examples of the functional body include building materials and interior materials such as tiles, window glass, ceiling panels, wallpapers, curtains, kitchen and sanitary equipment, home appliances, lamps, lighting equipment, and filters for dust collection. Any desired functional body can be used as the base.

The functional body may be a base material of a deodorizing filter. When the functional body is used as the base, the whole or a part of the functional body can be used as the base. For example, in the case of building materials and interior materials, it is often convenient to use substantially the entirety of the base material, but in the case of home appliances and lighting equipment, it is preferable to use a part of the base material. May be convenient.

By the way, the material of the base is allowed to be metal, glass, ceramics (including porcelain), pottery, stone, synthetic resin, wood and the like.

In addition, an appropriate underlayer can be formed on the substrate to deposit a photocatalyst film. As the underlayer, for example, a layer mainly composed of silica SiO ₂ can be used, and in this case, the photocatalytic activity is further improved.

As is clear from the above, in the present invention, the photocatalytic film may be applied to the substrate either directly or indirectly.

Photocatalyst Film The photocatalyst film is mainly composed of a photocatalyst substance, and the following photocatalyst substances are available. That is, TiO ₂ , WO ₃ , LaRhP ₃ , FeTiO ₃ , Fe
₂ O ₃ , CdFe ₂ O ₄ , SrTiO ₃ , CdSe, GaAs
s, GaP, RuO ₂ , ZnO, CdS, MoS ₃ , La
RhO ₃ , CdFeO ₃ , Bi ₂ O ₃ , MoS ₂ , In
₂ O ₃ , CdO, SnO ₂ and the like. One of these substances
Species or a mixture of plural types can be used.

Note that TiO ₂ , WO ₃ , SrTiO ₂ , F
e ₂ O ₃ , CdS, MoS ₃ , Bi ₂ O ₃ , MoS ₂ , In ₂
O ₃ , CdO and the like have an absolute value of redox potential in the valence band larger than an absolute value of redox potential in the conduction band, so that the oxidizing power is larger than the reducing power, and the deodorizing action due to the decomposition of organic compounds. Excellent antifouling action or antibacterial action.

In terms of raw material costs, TiO
₂ , Fe ₂ O ₃ and ZnO are excellent.

Further, among the substances having a photocatalytic action, titanium oxide is most promising at present. This is because titanium oxide is a substance that has a remarkable photocatalytic action, is commercially available at a reasonable price, and can be obtained in a required amount.

Titanium oxide has rutile-type and anatase-type crystal structures, and the anatase-type has better photocatalytic action.

In the present invention, the thickness of the photocatalyst film is 0.3
If it is not less than μm, the required operation and effect can be obtained. Further, in the case of an embodiment in which the photocatalytic film transmits visible light, if the film thickness is too large, the visible light transmittance is reduced, so that the film thickness is such that a desired visible light transmittance can be obtained. Although it is necessary to limit the thickness, in the case of an embodiment which does not transmit visible light, there is no particular upper limit of the film thickness. However, as the thickness of the photocatalyst film increases, the adhesion strength of the film generally decreases. Therefore, it is preferable to set an appropriate thickness.

As the binder for the photocatalyst particles, various known binders can be used. For example, a metal alcoholate constituting the photocatalyst substance may be used as the binder. In this case, the metal alcoholate is hydrolyzed,
A part of the photocatalyst film may be formed by baking, or only temporary fixing may be performed without baking at a relatively low temperature for crystallization.

When a photocatalyst film is formed by sol-gel method and formed by firing, the substrate needs to be a substance that can withstand the firing temperature.

Conversely, formation of a photocatalytic film on a substrate having no heat resistance, such as a synthetic resin, can be realized by using a low-temperature binder, for example, a material containing silica as a main component. In the case where silica is used as the binder, the configuration can be simplified by using silica having a requirement for light-transmitting fine particles described later.

Regarding the Translucent Fine Particles In the present invention, the phrase “attach to cover the photocatalytic particles at least on the surface side of the photocatalytic film” means that the transparent fine particles pass through before the ultraviolet rays enter the photocatalytic particles. It means that translucent fine particles are provided. Therefore, the light-transmitting fine particles are, for example, a layer formed on the surface of the photocatalyst film on the ultraviolet incident side, or are previously attached to the periphery of the primary or secondary particles of the photocatalyst particles before forming the photocatalyst film. Thus, the above requirements can be satisfied.

As the light-transmitting fine particles, for example, light-transmitting metal oxides such as silica and alumina, and chemically stable fluororesins and silicone resins can be used. Further, the translucent fine particles may transmit visible light as well as ultraviolet light, and are often welcomed.

Further, the particle diameter of the light-transmitting fine particles is smaller than the ion radius of the contaminant and larger than the ion radius of the odorous substance, that is, the gas. It may be about 1 μm.

Operation of the present invention Since the photocatalyst particles on the surface side of the photocatalyst film are covered with the translucent fine particles, the dirt substance is blocked by the translucent fine particles and cannot contact or adhere to the photocatalytic particles. .

On the other hand, the gas constituting the ultraviolet rays and the odorous substance passes through the light-transmitting fine particles, so that the photocatalytic film is activated to decompose the gas.

In other words, the translucent fine particles act as a kind of filter that blocks the passage of dirt substances and transmits ultraviolet and odorous gases. For this reason, according to the present invention, even if the ultraviolet irradiation is not performed or the photocatalytic action is insufficient due to the low irradiation, the rate of adhesion of the contaminants is significantly reduced.

According to a second aspect of the present invention, there is provided a photocatalyst according to the first aspect, wherein the light-transmitting fine particles are attached to the surface of the photocatalyst film in a layered manner.

The layer of the light-transmitting fine particles is generally 0.00
5 to 0.5 μm, preferably 0.01 to 0.1 μm
m. If the thickness of the layer is too small, gaps formed between the light-transmitting fine particles become large, and contaminants are easily transmitted. Also, as the thickness of the layer increases, the transmittance of ultraviolet light and odorous gas decreases.

The layer of light-transmitting fine particles is prepared, for example, by preparing a dispersion of light-transmitting fine particles dispersed in a suitable solvent together with a binder, applying the dispersion on a photocatalytic film, drying and firing. Can be formed.

Thus, according to the present invention, the photocatalyst film is formed, and the light-transmitting fine particles are adhered on the photocatalyst film, so that the configuration and the manufacturing method of the photocatalyst film can be freely selected. be able to.

According to a third aspect of the present invention, in the photocatalyst according to the first aspect, the light-transmitting fine particles are attached around the photocatalyst particles of the photocatalyst film.

In the present invention, since the light-transmitting fine particles adhere around the photocatalyst particles constituting the photocatalyst film, the photocatalyst film itself has a function of preventing contamination. The configuration is simplified.

Further, the light-transmitting fine particles may be configured to act as a binder for the photocatalyst particles.

Further, the light-transmitting fine particles are one of the photocatalyst particles.
In addition to the mode in which the plurality of primary particles are attached around the secondary particles, the mode in which the plurality of primary particles are attached around the secondary particles may also be used.

According to a fourth aspect of the present invention, there is provided a functional body comprising: a functional body; and the photocatalyst according to any one of the first to third aspects, wherein at least a part of the functional body is formed as a base. It is characterized by having.

In the present invention, the "functional body" is as described in claim 1.

The "functional body main body" means a part or the whole of the functional body excluding the photocatalytic film. For example, when the functional body is a tile, a normal tile portion is referred to as a functional body in the present invention, and if a photocatalytic film is formed on the front surface of the tile, a photocatalytic film is formed on a part of the functional body. Will be formed.

Thus, in the present invention, since the adhesion of the contaminants is prevented by the light-transmitting fine particles, even if the photocatalytic film is not activated or has a site with a low degree of activation, the entire functional body can be formed. It is difficult to disturb the external appearance because the stains cannot be unevenly spread over the entire surface. Moreover, the odor in the room can be decomposed by the photocatalytic film during use as a functional body.

When the functional body is a lamp, the photocatalytic film can be formed on the outer surface of the glass bulb of the lamp.

The principle of light emission of the lamp is not limited as long as the light emitting portion is surrounded by a glass bulb and includes a wavelength of 400 nm or less. For example, it is allowed to be an incandescent lamp, a discharge lamp, or the like.

In the case of an incandescent lamp, a halogen lamp having a higher color temperature has a higher emission ratio at a wavelength of 400 nm or less than a general lighting lamp.

In the case of a discharge lamp, either a low-pressure discharge lamp or a high-pressure discharge lamp may be used.

As a low-pressure discharge lamp, for example, there is a fluorescent lamp.

In the case of a fluorescent lamp, if necessary, the phosphor to be used can be selected to appropriately increase the emission of 400 nm or less. Such a fluorescent lamp has a relatively small decrease in visible light as compared to a fluorescent lamp for general lighting.
In addition, since the amount of ultraviolet light irradiating the photocatalyst is large, the decomposing power can be increased. Therefore, it is suitable as a lamp for activating the photocatalyst.

However, a fluorescent lamp using a phosphor of three-wavelength emission or a calcium halophosphate phosphor, which has been widely used for general illumination, may be used.

Further, a germicidal lamp, a black light, a chemical lamp or the like mainly for the purpose of utilizing light emission of 400 nm or less may be used.

On the other hand, the high-pressure discharge lamp may be, for example, a mercury lamp, a metal halide lamp, a high-pressure sodium lamp, or the like. The glass bulb is
It may be a light emitting tube surrounding the discharge medium, or an outer tube further surrounding the light emitting tube containing the light emitting part.

Thus, in the present invention, while illuminating the room by the light emitted from the lamp, the photocatalytic film can be activated by the ultraviolet light being emitted to decompose the odorous gas and deodorize. In particular, in the case of a lamp, since the photocatalyst film is disposed at a position where the ultraviolet light intensity is high, almost the entire photocatalyst film can be activated well and strong deodorization can be performed.

Next, when the functional body is a lighting fixture,
Since the luminaire is used at a position close to the lamp which is a source of ultraviolet rays, the photocatalytic film can be well activated with a strong ultraviolet intensity.

The portion where the photocatalytic film is formed is preferably a portion of the lighting fixture which is a light control means. The light control means is a reflector,
There may be a plurality of one or any combination of gloves, shades, translucent covers, chandeliers, louvers, and the like.

Since the light control means controls the light emission of the lamp in order to obtain a desired light distribution and appearance, the ultraviolet light of the lamp is also applied to the light control means. Is formed, it is possible to activate the photocatalyst film as required, and therefore it is effective to decompose and deodorize odorous gas. In addition, the use of lighting fixtures may cause organic substances such as smoke and tobacco fat to adhere to the light control means, and if they remain undecomposed at locations where activation is insufficient, the optical performance of the lighting fixture will decrease. In the light control means that can be seen from the outside as well as in the light-controlling means, the degraded part and the undegraded part can cause unevenness, which significantly impairs the appearance. , The appearance is hardly hindered. Moreover, since the odorous gas is decomposed by the photocatalytic film, the indoor deodorization is effectively performed.

Further, the lighting equipment is sized and structured so as to be housed in, for example, a refrigerator, an air conditioner, an air purifier, etc., and is disposed in these equipments, whereby deodorization can be performed in the equipment.

[0059]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a conceptual enlarged cross-sectional view showing a first embodiment of a photocatalyst according to the present invention.

In the figure, 1 is a substrate, 2 is a photocatalytic film, 3
Is translucent fine particles.

The base 1 is made of soda lime glass.

The photocatalyst film 2 is made of titanium oxide having a crystal structure of anatase type, and the primary particle size of the photocatalyst particles 2a is about 0.3 μm. The photocatalyst film 2 is prepared by preparing a titanium oxide photocatalyst particle 2a, a dispersion of titanium oxide composed of a binder and a solvent, applying the dispersion on the substrate 1, drying it for about 400 hours.
It was obtained by firing at a temperature of ° C.

The translucent fine particles 3 have a primary particle size of about 0.01.
The photocatalytic film 2 is made of silica having a thickness of about 0.1 μm.
It is formed in a layer shape of 1 μm. The translucent fine particles 3 in the form of a layer are prepared by preparing a dispersion liquid of silica comprising silica fine particles, an organic binder and a solvent, applying the dispersion on the photocatalyst film 2, drying and firing at a temperature of about 400 ° C. I got it.

Then, the photocatalyst of this embodiment was tested for adhesion of dirt. This test has a capacity of 6.5 m ³
Of the photocatalyst film after burning 10 cigarettes while irradiating light with a 20 W fluorescent lamp in a sealed box of the above. The yellowness was measured according to Japanese Industrial Standards (JIS) K710.
The yellowness index YI was calculated by reflection measurement according to Example 5.

As a result, the yellowness of the photocatalyst film body having no layer-shaped light-transmitting fine particles was 35, whereas the yellowness of the present embodiment was 1.

Next, the deodorizing effect was tested. In this test, paraformaldehyde was heated in an enclosed box having a capacity of 1.3 m ³ by an electric heater to fill the box, the DUT was placed in the box, and light was irradiated by a 20 W fluorescent lamp. This was obtained by measuring a change in gas concentration using a “multi-gas monitor” (manufactured by B & K).

FIG. 2 is a graph showing the deodorizing effect of the photocatalyst film in the first embodiment of the photocatalyst of the present invention in comparison with that of the conventional example.

In the figure, the horizontal axis represents time (minutes), and the vertical axis represents concentration percentage (%).

The curve A shows the deodorizing effect of the photocatalyst film according to the present embodiment.

Curve B represents the deodorizing effect of the conventional example having no light-transmitting fine particle layer, and curve C represents the concentration change when neither the photocatalyst film nor the light-transmitting fine particle layer is provided. Show.

As is clear from the figure, according to the photocatalyst of this embodiment, the deodorizing effect was almost the same as that of the photocatalyst without the translucent fine particles.

FIG. 3 is a conceptually enlarged sectional view of a principal part showing a second embodiment of the photocatalyst of the present invention.

In the figure, the same parts as those in FIG. 1 are denoted by the same reference numerals, and description thereof will be omitted.

The present embodiment is different in that the light-transmitting fine particles 3 are attached around the light-transmitting fine particles 2a.

That is, a dispersion comprising the photocatalyst particles 2a, the light-transmitting fine particles 3, a binder and a solvent is prepared and the substrate 1 is prepared.
Then, after drying and baking, a photocatalyst film 2 ′ having a structure in which the translucent fine particles 3 adhere around the photocatalyst particles 2 a or the secondary particles thereof can be formed.

Thus, also in the present embodiment, since the translucent fine particles adhere around the photocatalyst particles or the secondary particles thereof, the contamination substances are prevented from adhering to the photocatalyst film. Since it is hardly stained and the translucent fine particles transmit odorous gas and ultraviolet light, deodorization as a photocatalytic action can be obtained as desired.

FIG. 4 is a front view, partly cut away, showing a main part of a fluorescent lamp as a first embodiment of the functional body of the present invention.

In the figure, 11 is a glass bulb, 12 is a photocatalytic film, 13 is a phosphor layer, 14 is a filament electrode,
Reference numeral 15 denotes a base.

The glass bulb 11 functions as a base for the photocatalyst film 12, and hermetically accommodates therein a functional part as a fluorescent lamp. That is, a rare gas mainly composed of mercury and argon as a discharge medium is sealed in the glass bulb 11 for several torr, the phosphor layer 13 is supported on the inner surface, and a pair of filament electrodes 1 are provided on both ends.
4 is sealed.

The base 15 comprises an aluminum cap-shaped base body 15a made of aluminum and a pair of base pins 15b which are insulated from the base body 15a and are adhered to both ends of the glass bulb 11. Both ends of the filament electrode 14 are connected to base pins 15b, respectively.

The photocatalyst film 12 has the same configuration as the photocatalyst shown in FIG.

When the fluorescent lamp of this embodiment is turned on, the phosphor layer is mainly excited by the ultraviolet ray having a wavelength of 254 nm generated by the low-pressure vapor discharge of mercury inside the fluorescent lamp, and the visible light and a part of the phosphor layer having a wavelength of 34 nm or less are excited. These visible light and ultraviolet light pass through the glass bulb 11 and enter the photocatalytic film 12. Ultraviolet rays incident on the photocatalyst film 12 are absorbed by the photocatalyst particles and activate the photocatalyst particles, but most of visible light is transmitted through the photocatalyst film 12 and emitted to the outside.

As a result, while performing desired illumination with visible light, the action of the light-transmitting fine particles contained in the photocatalytic film 12 makes it difficult for organic contaminants to adhere to the surface of the fluorescent lamp, but smell gas does not. It is decomposed, that is, deodorized by passing through the light-emitting fine particles and contacting the photocatalyst particles.

FIG. 5 is a central sectional front view showing a lighting fixture as a second embodiment of the functional body of the present invention.

In the figure, 21 is a lighting fixture body, 22 is a pendant cord, 23 is a hooking sealing cap, 2
4a and 24b are fluorescent lamps, 25 is a shade, and 26 is a photocatalytic film.

The lighting fixture body 21 has a lower surface that bulges out, an outer surface thereof is formed as a reflective surface, a lighting circuit including an inverter is housed inside, and a cord suspension / storing device 21a is provided on the upper surface. A lamp holder (not shown) and a lamp holder / lamp socket 21b protrude radially outward from the surface.

The lower end of the pendant cord 22 is drawn into the cord suspending / storing device 21a of the lighting fixture body 21, and is connected to the input terminal of the lighting circuit. The upper end of the pendant cord 22 is connected to a hooking sealing cap 23. The lighting fixture is used by being suspended from the ceiling via the pendant cord 22 and the hanging ceiling cap 23.

The hanging length of the lighting fixture can be set to a desired hanging height by storing the surplus part of the pendant cord 22 in the cord hanging / storing device 21a.

The hanging ceiling cap 23 is provided on the ceiling in advance, and is detachably attached to the hanging ceiling body connected to the power supply with one touch, so that the lighting equipment can be mechanically and electrically connected.

The fluorescent lamps 24a and 24b are both elongated and high frequency lighting type having a relation of 16.5 mm. 24a
Is FHC type 34, and 24b is FHC type 27. These fluorescent lamps 24a and 24b are supported between the lamp holder and the lamp holder / lamp socket 21b.

The shade 25 is made of a light-transmitting synthetic resin.
It has a hat shape, and its upper end is locked around the cord suspension / storage device 21a and is supported by the lighting fixture body 21.
The air inside the shade 25 whose temperature has been increased by the heat generated by the fluorescent lamps 24a and 24b is discharged out of the lighting fixture through the ventilation hole 25a, so that it is cooled by the heat convection of the indoor air.

The photocatalyst film 26 is formed on the inner surface of the shade 25 and has a structure as shown in FIG. That is, the photocatalyst film 26 has layered light-transmitting fine particles (not shown) on its upper surface. However, since the base is a synthetic resin, the photocatalyst film 26 is formed without firing by using a low-temperature binder.

Since the heated air flows through the shade 25 using the lighting equipment as a heat source, the odorous gas in the room rises along the inner surface of the shade 25 in the photocatalyst in the process of rising. Decomposed upon contact with the membrane 26.

Therefore, even if it does not include an indoor circulation means such as a circulator, the deodorizing effect can be satisfactorily performed while the indoor air is circulated by a kind of chimney action created by the lighting equipment.

[0096]

According to the first to third aspects of the present invention, at least the photocatalyst particles on the surface side of the photocatalyst film are covered with light-transmitting fine particles that selectively transmit ultraviolet light and gas.
Since the photocatalyst film is activated by ultraviolet irradiation while deteriorating the adhesion of dirt to decompose the odorous gas, it is possible to provide a photocatalyst that has a deodorizing effect and makes dirt less noticeable.

According to the second aspect of the present invention, in addition, by forming the light-transmitting fine particles in a layer on the photocatalyst film, it is possible to provide a photocatalyst body in which the configuration and the manufacturing method of the photocatalyst film can be freely selected. .

According to the third aspect of the present invention, since the light-transmitting fine particles adhere to the periphery of the photocatalyst particles, the photocatalyst film itself has a function of preventing the adhesion of dirt, and the light-transmitting fine particles are attached. Can be provided as a binder for the photocatalyst particles.

According to the invention of claim 4, it is possible to provide a functional body having the effects of claims 1 to 4.

[Brief description of the drawings]

FIG. 1 is a conceptual enlarged cross-sectional view showing a first embodiment of a photocatalyst body according to the present invention.

FIG. 2 is a graph showing the deodorizing effect of the photocatalyst film in the first embodiment of the photocatalyst body of the present invention in comparison with that of the conventional example.

FIG. 3 is a conceptual enlarged cross-sectional view of a principal part showing a second embodiment of the photocatalyst of the present invention.

FIG. 4 is a cross-sectional front view of an essential part of a fluorescent lamp as a first embodiment of the functional body of the present invention.

FIG. 5 is a front view of a lighting device as a functional body according to a second embodiment of the present invention, which is viewed from the center in cross section.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Substrate 2 ... Photocatalyst film 2a ... Photocatalyst particle 3 ... Translucent fine particle

Claims (4)

[Claims] 1. A substrate; a photocatalyst film adhered to the substrate; and translucent fine particles selectively transmitting ultraviolet light and a gas attached to cover the photocatalyst particles on at least the surface side of the photocatalyst film. A photocatalyst, comprising: 2. The photocatalyst according to claim 1, wherein the translucent fine particles are adhered in a layer on the surface of the photocatalytic film. 3. The photocatalyst according to claim 1, wherein the translucent fine particles are attached around the photocatalyst particles of the photocatalyst film. 4. A functional body comprising: a functional body main body; and the photocatalyst according to claim 1 formed with at least a part of the functional body main body as a base. .