JP2003205244A - Photocatalyst carrier - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a photocatalyst carrier capable of increasing the surface area of a photocatalyst disposed on the surface of a substrate. <P>SOLUTION: The photocatalyst carrier 10 is obtained by nearly vertically sticking a great number of slender first fibrous bodies 16 coated with a photocatalyst 14 comprising anatase-type titanium dioxide (TiO<SB>2</SB>) on the surface of a substrate 12 with an adhesive 18 comprising a material having UV transmittance (e.g. inorganic and hybrid inorganic binders such as an alkali silicate binder, an ethyl silicate binder, an alkoxysilane binder, an alkoxysilane binder into which organic functional groups have been partially introduced and an alkoxysilane binder reacted with an organic polymer). <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a photocatalyst carrier having a photocatalyst disposed on the surface of a substrate, and more particularly to a photocatalyst carrier capable of increasing the surface area of the photocatalyst disposed on the substrate surface.

[0002]

_2. Description of the Related Art Photocatalysts such as titanium oxide (TiO ₂ ) are
When it is irradiated with ultraviolet rays, it is activated to generate a strong redox effect, and nitrogen oxides (NO _x ), sulfur oxides (SO _x ).
As shown in FIG. 10, since it exerts the action of effectively decomposing harmful compounds such as
Attempts have been made to purify air and water by using a photocatalyst carrier 74 in which a photocatalyst 72 is film-formed on the surface of 70.

[0003]

The decomposition of harmful compounds, pollutants and the like by the photocatalyst is an action caused by the contact of these harmful compounds and pollutants with the photocatalyst. Therefore, in order to improve the ability of the photocatalyst to purify air or water, it is desirable to increase the surface area of the photocatalyst as much as possible. However, in the above-mentioned conventional photocatalyst carrier 74, since the photocatalyst 72 is arranged in the form of a film on the surface of the base body 70, the surface area of the photocatalyst 72 cannot be expanded to be larger than the surface area of the base body 70. .

The present invention has been made in view of the above-mentioned conventional problems, and an object of the present invention is to provide a photocatalyst carrier capable of dramatically increasing the surface area of the photocatalyst disposed on the surface of the substrate. It is in realization.

[0005]

In order to achieve the above object, in the photocatalyst carrier according to the present invention, a large number of fibrous bodies whose surface is coated with a photocatalyst are provided on the surface of the substrate. It is characterized in that it is attached to the surface in an upright state.

In the photocatalyst carrier of the present invention, a large number of fibrous bodies coated with the photocatalyst are deposited on the surface of the substrate in a standing state, so that the surface area of the substrate is coated. The surface integral of a large number of fibrous bodies is increased, and as a result, the surface area of the photocatalyst arranged on the surface of the substrate can be dramatically increased.

The above fibrous body whose surface is coated with a photocatalyst can be formed by coating the surface of a fiber such as glass fiber or resin fiber with a photocatalyst.

The fibrous body whose surface is coated with a photocatalyst is a sintering layer in which the surface of a fiber made of silica glass is sintered with the anatase type titanium oxide penetrating into the fine pores of the silica glass. And a photocatalyst made of anatase type titanium oxide is coated on the surface of the sintering layer. In this case, since the photocatalyst and the fiber are bonded to each other through the sintering layer sintered in the state where the anatase-type titanium oxide permeates into the fine pores of the silica glass, the photocatalyst and the fiber are bonded to each other. Is very strong, the photocatalyst does not easily peel, and has excellent durability.

Further, another photocatalyst carrier of the present invention comprises a large number of fibrous bodies composed of photocatalyst fibers on the surface of a substrate.
It is characterized in that it is adhered to the surface of the substrate in an upright state.

Also in the other photocatalyst carrier of the present invention, since a large number of fibrous bodies composed of photocatalyst fibers are applied to the surface of the substrate in an upright state, the surface area of the substrate is The surface integral of many attached fibrous bodies is increased, and as a result, the surface area of the photocatalyst arranged on the surface of the substrate can be dramatically increased.

The substrate may be formed in a substantially cylindrical shape, and the fibrous body may be attached to the inner surface of the substrate in a standing state with respect to the inner surface of the substrate. In this way, if the base is formed in a substantially cylindrical shape and the fibrous body is adhered to the inner surface of the base, an ultraviolet lamp can be inserted and arranged inside the base, and all the radiation from the ultraviolet lamp can be radiated. It is possible to irradiate the photocatalyst on the inner surface of the substrate substantially uniformly and activate it without waste of the ultraviolet rays.

The above-mentioned fibrous body can be adhered to the surface of the substrate through the ultraviolet-transparent adhesive adhered to the surface of the substrate. In this case, a part of each fibrous body will be adhered to the surface of the substrate in a state of being buried in the adhesive, but since this adhesive has ultraviolet transparency,
The photocatalyst on the surface of the fibrous body embedded in the adhesive can be sufficiently irradiated with ultraviolet rays.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of a photocatalyst carrier according to the present invention will be described below with reference to the drawings. FIG. 1 shows a first photocatalyst carrier 10 according to the present invention. The photocatalyst carrier 10 comprises anatase on a surface of a plate-shaped substrate 12 made of an appropriate material such as glass, resin or metal. A number of elongated first fibrous bodies 16 coated with a photocatalyst 14 of titanium oxide (TiO ₂ ) of the type
12 It is attached in a standing state substantially perpendicular to the surface. As shown in FIGS. 2 and 3, the first fibrous body 16 is formed by coating the surface of the fiber 20 such as glass fiber or resin fiber with the photocatalyst 14, and has a diameter of 5 to 50 μm and a length. Is about 20 to 5000 μm. Also, the adjacent first
The interval between the fibrous bodies 16 is about 5 to 100 μm, and the density is high. The thickness of the photocatalyst 14 is 1 to 3
It is about μm. As the method for coating the photocatalyst 14 on the fibers 20, various methods conventionally used can be used.For example, in a dispersion liquid of the photocatalyst, after immersing the fibers 20 such as glass fibers and resin fibers, drying and firing. It is possible to cover by.

The deposition of the first fibrous body 16 on the surface of the substrate 12 can be carried out by the electrostatic flocking method. this is,
The first fibrous body 16 is flocked on the surface of the substrate 12 to which the adhesive 18 has been applied, in a state where the first fibrous body 16 is raised using static electricity. The adhesive 18 is made of a material having ultraviolet transparency, and includes, for example, an alkali silicate bond, an ethyl silicate bond, an alkoxy lane bond, an alkoxy lane bond in which an organic functional group is partially introduced, and an organic substance. An inorganic binder such as an alkoxysilane bond obtained by reacting a polymer or a hybrid inorganic binder can be preferably used.

When the photocatalyst 14 on the surface of the first fibrous body 16 of the first photocatalyst carrier 10 is irradiated with ultraviolet rays from an ultraviolet lamp (not shown) or the like, the photocatalyst 14 is activated and contacts the surface of the photocatalyst 14. The purified air and water can be purified. Thus, in the first photocatalyst carrier 10, a large number of first fibrous bodies 16 coated with the photocatalyst 14 are provided.
Was deposited in an upright state substantially perpendicularly to the surface of the base body 12, so that the surface area of the base body 12 was increased by the surface integral of a large number of the deposited first fibrous bodies 16. The surface area of the photocatalyst 14 arranged on the surface of the base 12 can be dramatically increased as compared with the case where the photocatalyst 72 is arranged on the surface of the base 70 as a film like the conventional photocatalyst carrier 74. For example, the number, diameter, length,
It is possible to arrange the photocatalyst 14 with a surface area which is several thousand times the surface area of the substrate 12 by appropriately adjusting the interval between the fibrous bodies 16. In addition, each first fibrous body 16 is a base
Since it is applied "substantially perpendicular" to the 12 surface,
The first fibrous bodies 16 do not cross each other and are intertwined,
As a result, when it is irradiated with ultraviolet rays, there is almost no shadow portion where the ultraviolet rays do not hit. Therefore, each first
Since the photocatalyst 14 of the fibrous body 16 is sufficiently irradiated with ultraviolet rays, the activation efficiency of the photocatalyst 14 is extremely high.

Incidentally, as shown in FIG. 1, each first fibrous body 16
Part of the adhesive will be adhered to the surface of the substrate 12 in a state of being buried in the adhesive 18. However, as described above, the adhesive 18 has ultraviolet transparency, The photocatalyst 14 on the surface of the first fibrous body 16 in the portion buried in 18 can be sufficiently irradiated with ultraviolet rays.

FIGS. 4 and 5 show a second photocatalyst carrier 30 according to the present invention. This second photocatalyst carrier
In 30, a base 32 is formed into a substantially cylindrical shape, and the inner surface of the base 32 is covered with the photocatalyst 14.
The fibrous body 16 is adhered to the inner surface of the base body 32 with the adhesive 18 in an upright state in a substantially vertical manner. In FIGS. 4 and 5, reference numeral 34 denotes an ultraviolet lamp inserted into the base 32.

When the second photocatalyst carrier 30 is irradiated with ultraviolet rays from the ultraviolet lamp 34, the second photocatalyst carrier 30 receives the photocatalyst 14.
Can be activated to purify the air or water contacting the surface of the photocatalyst 14. This second photocatalyst carrier
In the same manner as the first photocatalyst carrier 10 described above, a large number of the first fibrous bodies 16 coated with the photocatalyst 14 are provided on the substrate 32.
Since it was attached in a standing state substantially perpendicular to the inner surface,
The surface area of the photocatalyst 14 arranged on the inner surface of the base 32 can be dramatically increased. In addition, each first fibrous body 16
Since the first fibrous bodies 16 do not cross each other and are entangled with each other because they are adhered "substantially perpendicularly" to the inner surface of the base 32, as a result, when the first fibrous bodies 16 are irradiated with ultraviolet rays, There is almost no shadow part that does not hit. Therefore,
The photocatalyst 14 of each first fibrous body 16 is sufficiently irradiated with ultraviolet rays, and the activation efficiency of the photocatalyst 14 is extremely high. Further, in the second photocatalyst carrier 30, since the base 32 is formed in a substantially cylindrical shape and the first fibrous body 16 is adhered to the inner surface of the base 12, the inside of the base 32 is concerned. The ultraviolet lamp 34 can be inserted and disposed in the base 12, and all the ultraviolet rays emitted from the ultraviolet lamp 34 are not wasted, and the base 12
The photocatalyst 14 on the inner surface can be activated by being irradiated substantially uniformly.

As the photocatalyst 14, besides titanium oxide, ZnO, SrTiO ₃ , BaTiO ₃ , Fe ₂
Other metal oxides having a photocatalytic action such as O ₃ can be used, but anatase type titanium oxide is most suitable because it has excellent photocatalytic activity.

In the first photocatalyst carrier 10, instead of the first fibrous body 16, a second fibrous body 40 whose surface is coated with the photocatalyst 14 as shown in FIGS. 6 and 7, Alternatively, a third fibrous body 50 composed of photocatalytic fibers 52 as shown in FIGS. 8 and 9 is used, and a large number of second fibrous bodies 40 or a large number of three fibrous bodies 40 are formed on the surface of the substrate 12. The fibrous body 50 may be adhered to the surface of the substrate 12 with the adhesive 18 in an upright state substantially vertically. In this case, a large number of second fibrous bodies 40 whose surface is coated with the photocatalyst 14 or photocatalyst fibers
Since a large number of third fibrous bodies 50 composed of 52 are deposited in a standing state substantially perpendicular to the surface of the base body 12,
The surface area of 12 increases the surface integral of the large number of the second fibrous bodies 40 or the large number of the third fibrous bodies 50 deposited, and as a result, the photocatalyst like the conventional photocatalyst carrier 74 is increased.
Compared to the case where 72 is arranged in a film on the surface of the base 70, the base
12 The surface area of the photocatalyst placed on the surface can be dramatically increased.

Similarly, in the second photocatalyst carrier 30, instead of the first fibrous body 16, the second fibrous body 40 as shown in FIGS. 6 and 7, or FIG. Using a third fibrous body 50 as shown in FIG. 9, a large number of second fibrous bodies 40, or a large number of three fibrous bodies 50 are provided on the inner surface of the substrate 32 with an adhesive 18 interposed therebetween. Then, the base 32 may be attached in a standing state substantially perpendicular to the inner surface of the base 32. In this case, a large number of second fibrous bodies 40 whose surfaces are coated with the photocatalyst 14 or a large number of third fibrous bodies 50 composed of the photocatalytic fibers 52.
Of the second fibrous body 40 or the large number of the second fibrous bodies 40, which are attached to the inner surface of the base 32 in a standing state substantially perpendicularly to the inner surface of the base 32. Fibrous body 3
The surface integral of the photocatalyst is increased, and the surface area of the photocatalyst arranged on the inner surface of the base 32 can be dramatically increased.

The second fibrous body 40 shown in FIGS. 6 and 7 is
On the surface of the fiber 20 made of silica glass, a sintering layer 42 is formed by sintering while anatase type titanium oxide is permeated into the fine pores of the silica glass, and further, on the surface of the sintering layer 42, anatase is formed. It is constructed by coating a photocatalyst 14 of titanium oxide of the type. The second fibrous body 40 is prepared by forming a fiber 20 made of silica glass into a metal alkoxide solution of titanium, which is a material of the photocatalyst 14, before sintering the silica which is a material of the silica glass fiber. 40 after impregnated into
It can be obtained by heating and sintering at a temperature of 0 to 800 ° C. That is, since silica before sintering has a large number of fine pores on the surface, when silica is impregnated in a metal alkoxide solution of titanium, the surface of the silica is coated with the metal alkoxide solution of titanium and Thus, the titanium metal alkoxide solution penetrates into the fine pores of the silica. In this state, when heated at a temperature of 400 to 800 ° C., the silica is sintered to form the fiber 20 made of silica glass, and the metal alkoxide solution of titanium on the silica surface is hydrolyzed and polymerized to cause anatase type. A photocatalyst 14 made of titanium oxide is formed. Furthermore, the micropores on the silica surface are also sintered to form silica glass, and the metal alkoxide solution of titanium that has penetrated into the micropores of silica is also hydrolyzed and polymerized to form anatase-type titanium oxide. As a result, the sintering layer 42 is formed by sintering while the anatase-type titanium oxide penetrates into the fine pores of the silica glass. In the second fibrous body 40, the photocatalyst 14 and the fiber 20 are bonded to each other through the sintering layer 42 that is sintered while the anatase-type titanium oxide permeates into the fine pores of the silica glass. Photocatalyst 14 and fiber
The bond with 20 is very strong, the photocatalyst 14 does not easily peel off, and the durability is excellent.

The third fibrous body 50 shown in FIGS. 8 and 9 is
Anatase type titanium oxide (TiO _Two) Photocatalyst
Composed of fibers 52. This photocatalytic fiber 52 is, for example,
For example, it can be formed by the following method. First,
Metal alkoxide of titanium and metal alkoxide of the titanium
Water for hydrolysis of side, a solvent such as methanol,
Of the above-mentioned titanium metal alkoxide hydrolysis and polymerization reactions
A photocatalytic material in a solution state is prepared by blending with a regulator.
Next, the photocatalyst material in a solution state is heated to, for example, about 200 ° C.
Evaporate the solvent by heating at a relatively low temperature
At the same time, hydrolysis and heavy metal alkoxide of titanium
The photocatalytic material in solution is made viscous by partially advancing the reaction.
Formed as a sol. Next, the viscous sol-shaped photocatalyst material is stretched.
After that, heat and bake at a temperature of 400 ° C to 800 ° C
Completely promote the polymerization reaction of metal alkoxide of tan
As a result, a gel-like elongated photocatalytic fiber is formed.
If the photocatalyst fiber is cut into a predetermined length,
A fissure 52 can be formed.

[0024]

In the photocatalyst carrier according to the present invention,
Since a large number of fibrous bodies coated with a photocatalyst were deposited on the surface of the substrate in an upright state, the surface area of the substrate was to increase the surface integral of the deposited numerous fibrous bodies.
As a result, the surface area of the photocatalyst arranged on the surface of the substrate can be dramatically increased.

Also, in the other photocatalyst carrier of the present invention, since a large number of fibrous bodies composed of photocatalyst fibers are adhered to the surface of the substrate in an upright state, the surface area of the substrate is reduced. That is, the surface integral of many deposited fibrous bodies is increased, and as a result, the surface area of the photocatalyst arranged on the surface of the substrate can be dramatically increased.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a first photocatalyst carrier according to the present invention.

FIG. 2 is an enlarged vertical sectional view of a first fibrous body.

FIG. 3 is an enlarged cross-sectional view of a first fibrous body.

FIG. 4 is a cross-sectional view showing a second photocatalyst carrier according to the present invention.

FIG. 5 is a vertical sectional view showing a second photocatalyst carrier according to the present invention.

FIG. 6 is an enlarged vertical cross-sectional view of a second fibrous body.

FIG. 7 is an enlarged cross-sectional view of a second fibrous body.

FIG. 8 is an enlarged vertical sectional view of a third fibrous body.

FIG. 9 is an enlarged cross-sectional view of a third fibrous body.

FIG. 10 is a cross-sectional view showing a conventional photocatalyst carrier.

[Explanation of symbols]

10 First photocatalyst carrier 12 Base 14 Photocatalyst 16 First fibrous body 18 Adhesive 20 fibers 30 Second photocatalyst carrier 32 substrates 40 Second fibrous body 50 Third fibrous body 52 Photocatalytic fiber

   ─────────────────────────────────────────────────── ─── Continued front page    F-term (reference) 4G069 AA03 AA08 AA11 BA02A                       BA02B BA04A BA04B BA14A                       BA14B BA48A BB04A BB06A                       BC12A BC13A BC35A BC50A                       BC66A EA06 EA07 EB04                       EB08 EB15Y EC22X EC22Y                       FA03 FB71

Claims (6)

[Claims] 1. A photocatalyst carrier, wherein a large number of fibrous bodies, the surface of which is coated with a photocatalyst, are applied to the surface of the substrate in a standing state on the surface of the substrate. 2. The discharge tube with a photocatalyst according to claim 1, wherein the fibrous body is formed by coating the surface of a fiber such as glass fiber or resin fiber with a photocatalyst. 3. The fibrous body forms, on the surface of a fiber made of silica glass, a sintering layer in which anatase-type titanium oxide penetrates into fine pores of the silica glass and is sintered, and further, The discharge tube with a photocatalyst according to claim 1, wherein the surface of the sintering layer is coated with a photocatalyst made of anatase type titanium oxide. 4. A photocatalyst carrier, wherein a large number of fibrous bodies made of photocatalyst fibers are adhered to the surface of the substrate in a standing state on the surface of the substrate. 5. The base is formed into a substantially cylindrical shape, and
The fibrous body is adhered to the inner surface of the substrate in a standing state with respect to the inner surface of the substrate.
The photocatalyst carrier according to any one of 1. 6. The photocatalyst support according to any one of claims 1 to 5, wherein the fibrous body is adhered via an adhesive having an ultraviolet-transmitting property adhered to the surface of the substrate. body.