JP2002052344A - Photocatalyst structure with light source and photocatalyst structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a photocatalyst structure with a light source of which the shaded part of a sheet-like material carrying a photocatalyst is made as small as possible and which can utilize light from a rod-like light source to the maximum; and a photocatalyst structure used therefor. SOLUTION: This photocatalyst structure with a light source comprises a rod-like light source 2 and a continuous sheet-like material which carries a photocatalyst, is folded a plurality of times alternately in the opposite direction, has an insertion section 1a formed therein for inserting the rod-like light source 2, and is fixed by the rod-like light source 2 inserted into the insertion section 1a.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a photocatalyst structure having a light source in which a sheet-like material carrying a photocatalyst is engaged with a light source such as an ultraviolet lamp, and is useful for purifying gas and liquid.

[0002]

2. Description of the Related Art Heretofore, as a sheet-like material carrying a photocatalyst, a sheet carrying a photocatalyst on both sides or a mesh-like sheet carrying a photocatalyst on the entire surface has been used. Since these are usually used in a flat or cylindrical state, they can be irradiated only on one side even when irradiated with a single rod-shaped ultraviolet lamp, and even when the supporting sheet is transparent, the photocatalyst absorbs and excites. Light of the given wavelength hardly reaches the surface opposite to the light irradiation.

There is also a method in which a supporting sheet is made into a small honeycomb shape and a rod-shaped ultraviolet lamp is applied from above in the opening direction. When a lamp is located directly above a honeycomb hole, light reaches the inside of the honeycomb. If there is no lamp directly above, the light shines only up to a certain angle. Then, the portion where light did not hit increased as the distance from the lamp increased, and the entire honeycomb could not be irradiated with light, resulting in poor efficiency.

On the other hand, if the sheet is folded into a pleated shape (bellows) in order to increase the light receiving area of the supporting sheet and a lamp is irradiated from one side of the sheet, light can be applied to a larger area. Light did not hit the surface and efficiency was poor.

It is also possible to prepare two or more lamps and irradiate light from both sides of the supporting sheet. However, in general, a lamp as a light source is often more expensive than a photocatalyst supporting sheet, and energy consumption is increased. Therefore, efficiency and economic efficiency are inferior.

[0006]

That is, in any of the above methods, the light from the light source cannot be applied to the entire surface of the supporting sheet, and the irradiation efficiency is poor. It was difficult.

Accordingly, an object of the present invention is to provide a photocatalyst structure with a light source and a photocatalyst structure capable of maximizing the use of light from a rod-shaped light source by minimizing the shadow portion of a sheet-like material carrying a photocatalyst. Is to provide the body.

[0008]

The above object can be achieved by the present invention as described below. That is, the photocatalyst structure with a light source of the present invention is characterized in that a sheet-like material carrying a photocatalyst is provided with an insertion portion for a rod-like light source and is locked by the inserted rod-like light source.

[0009] In the above, it is preferable that the sheet-like material is formed by providing a continuous sheet which is bent a plurality of times alternately with an insertion portion for each bending unit.

It is preferable that the sheet-like material is a mesh-like sheet carrying a photocatalyst.

On the other hand, the photocatalyst structure of the present invention is characterized in that a continuous body of a sheet-like material supporting a photocatalyst is alternately bent a plurality of times to provide a rod-shaped light source insertion portion for each bending unit. .

According to the photocatalyst structure with a light source of the present invention, the rod-like light source is inserted into the sheet-like object and the rod-like light source is inserted into the sheet-like object. Light can be applied to both sides of the lens, and shadows can be reduced. In addition, since the sheet is locked by the rod-shaped light source, the photocatalyst can function by disposing the sheet at a desired position of the light source.

In the case where the sheet-like object is a continuous sheet which is alternately bent a plurality of times and provided with an insertion portion for each bending unit, the sheet-like object is arranged at a high density in a range close to a rod-like light source. In addition, even when the insertion portion is loosely inserted, the sheet-like object can be easily fixed to the rod-shaped light source stably due to the reaction force of the bending. It should be noted that the smaller the radius of curvature of the bent portion, the smaller the number of shadows, which is more preferable in increasing the irradiation efficiency.

When the sheet-like material is a mesh-like sheet carrying a photocatalyst, the mesh holes allow gas or the like to pass therethrough, so that even when the sheets are arranged at a high density, a flow path for the gas or the like is secured. Thus, the photocatalyst can function more efficiently.

On the other hand, according to the photocatalyst structure of the present invention, the continuous body of the sheet-like material supporting the photocatalyst is alternately bent a plurality of times to provide the insertion portion of the rod-shaped light source for each bending unit. By irradiating light to both sides of the sheet from the bar-shaped light sources on both sides of the sheet, shadows can be reduced, and the sheets can be arranged at high density in a range close to the bar-shaped light source, so that the photocatalyst can function efficiently. Can be. Further, even when the insertion portion is loosely inserted, the sheet-like material can be easily fixed to the rod-shaped light source stably due to the reaction force of the bending.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in the order of structure, material, manufacturing method and the like with reference to the drawings. As shown in FIG. 1, the photocatalyst structure with a light source according to the present invention has a structure in which a sheet-like material 1 supporting a photocatalyst is provided with an insertion portion 1a of a bar-shaped light source 2 and is locked by the inserted bar-shaped light source 2. In the example of FIG. 1, as the sheet-like object 1, a continuous sheet that is alternately bent a plurality of times at the bent portions 1 b and provided with the insertion portions 1 a for each bending unit, that is, the photocatalyst structure of the present invention is used. I have. The bent portion 1b may be bent in an arc shape or a curved shape. However, it is preferable that the radius of curvature is smaller because the shadow portion on the outer surface of the bent portion 1b is reduced.

In the example of FIG. 1, the insertion portion 1a is a rod-shaped light source 2.
Although it is formed by a circular hole having an inner diameter equal to or slightly larger than the outer diameter of the rod-shaped light source, any shape may be used as long as the rod-shaped light source 2 can be inserted therethrough. However, in order to arrange the sheet-like material 1 perpendicular to the axis of the rod-shaped light source 2, it is preferable that the circular hole has an inner diameter equal to the outer diameter of the rod-shaped light source 2. Even when the inner diameter of the insertion portion 1a is slightly large and the rod-shaped light source 2 is in the loose insertion state, the sheet-shaped material 1 is stably fixed and held on the rod-shaped light source 2 by the reaction force of the bending of the sheet-shaped material 1.

When the bending reaction force at the bent portion 1b of the sheet-like material 1 is large and the bending rigidity of the sheet-like material 1 is small, the sheet-like material 1 tends to have a curved surface near the bent portion 1b, and the outside thereof is shadowed. May be. In such a case, the bent portion 1b
It is effective to make a cut along to reduce the reaction force of bending.

The photocatalyst structure with a light source according to the present invention is not limited to the structure shown in FIG. 1, but may be a photocatalyst structure as shown in FIGS. 6 (a) to 6 (c).

FIG. 6A shows a perspective view and a cross-sectional view of another example of the photocatalyst structure. In this structure, the insertion portion of the rod-like light source 2 is inserted into a substantially flat sheet-like material 1. A plurality of rods 1a are arranged for the rod-shaped light source 2. At this time, since the insertion portion 1a has the two urging engagement pieces 1c, each of the sheet-like objects 1 is stably fixed and supported while facilitating the insertion of the rod-shaped light source 2. However, depending on the outer diameter of the rod-shaped light source 2, the insertion portion 1a having an appropriate size and shape is used.
Is formed, the same function as that of the biasing locking piece 1c can be provided.

The structure shown in FIG. 6 (b) is similar to that shown in FIG. 1 and is a sheet-like material 1 bent only once at a bent portion 1b.
Are provided with the insertion portions 1a for the respective bending units. Also in this structure, similarly, the sheet-like object 1 is stably fixed and held on the rod-like light source 2 by the reaction force of the bending of the sheet-like object 1.

The structure shown in FIG. 6C has a cut 1c extending from the edge of each sheet 1 or the bent portion 1b of the continuous sheet 1 to the insertion portion 1a. By the cut 1c, the rod-shaped light source 2 can be inserted into the sheet 1 through the cut 1c while the rod-shaped light source 2 is installed. The same effect can be obtained by providing a notch reaching the insertion portion 1a instead of the notch 1c.

In the present invention, it is preferable that the sheet-like material 1 has a photocatalyst supported on a mesh-like sheet. However, in the case of a mesh-like sheet, it is often difficult to bend at an acute angle in relation to the material. Therefore, in the case of forming a continuous body, FIG.
The sheet can be arranged at high density by adopting the structure shown in FIG. That is, it is preferable that the mesh sheet 3 is bent at the arcuate bent portion 3b, and the mesh sheet 3 is disposed with respect to the rod-shaped light source 2 such that the adjacent bent portions 3b are in contact with or almost in contact with each other.

Since the light intensity is inversely proportional to the square of the distance,
The further away from the light source, the smaller the photocatalytic effect. For this reason, as the sheet-like object 1 of the photocatalyst structure or the bending unit thereof increases, the difference in the irradiation amount from the light source near the rod-shaped light source 2 and near the edge or the bent portion of the sheet-like object 1 increases. Become. Therefore, in order to reduce the difference and increase the irradiation efficiency, the length (longest portion) from the surface of the rod-shaped light source 2 to the edge or the bent portion of the sheet-like material 1 is preferably 100 mm or less, and more preferably 50 mm or less. More preferred.

Further, in order to increase the arrangement density of the sheet 1 while keeping the irradiation amount of the light from the light source to the sheet 1 constant or more, the interval (pitch) of the sheet 1 or its bending unit is 20 mm or less. Is preferred, and 3 to 8 mm is more preferred.

On the other hand, a UV lamp,
An optical fiber or the like is used. Further, the number of the rod-shaped light sources 2 is not limited to one, but may be plural.

Hereinafter, the material, manufacturing method, and the like of the photocatalyst structure of the present invention will be described.

As the photocatalyst structure of the present invention, any sheet-like material carrying a photocatalyst can be used. Specifically, a nonporous sheet or a porous sheet carrying a photocatalyst on both surfaces,
A sheet in which a photocatalyst is supported on a mesh sheet may be used. These sheet materials are obtained by supporting particles of a photocatalyst on a supporting substrate directly or via an appropriate binder. As a supporting substrate, a film, a sheet, a fiber woven fabric,
Non-woven fabrics, mesh sheets and the like can be mentioned. The material of the supporting substrate may be any material such as resin, ceramic, and metal.

Examples of the photocatalyst include titanium oxide, strontium titanate, tungsten oxide, zinc oxide, tin oxide, and cadmium sulfide. Anatase type titanium oxide fine particles exhibiting the most excellent photocatalytic activity can be used. preferable. Further, in order to enhance the activity of the photocatalyst particles, an alkali metal ion can be supported.

Examples of the binder include an organic binder such as a fluororesin such as polytetrafluoroethylene, vinyl ether-fluoroolefin copolymer and vinyl ester-fluoroolefin copolymer, and a silicone resin, and an inorganic binder such as silica-based and metal amorphous. Any one may be used.

In the present invention, when the photocatalyst is supported on the sheet-like material, it is preferable that the photocatalyst fine particles be supported in the communication gap in the fired body of the polytetrafluoroethylene resin. In this sheet-like material, a photocatalyst layer is provided on the surface of a supporting base material, photocatalyst fine particles are dispersed in a sintered body of sintered polytetrafluoroethylene powder, and fine voids are formed between the resin and the photocatalyst fine particles. The gaps between the sintered polytetrafluoroethylene powders are connected to the air layer to form a multi-gap communication structure.

In order to produce the sheet-like material in the present invention, a dispersion containing polytetrafluoroethylene powder and photocatalyst fine particles is applied to a supporting substrate, and the solvent in the coating layer is removed by heating by heating. The polytetrafluoroethylene particles are sintered by heating and firing (heating temperature is 330 ° C. or higher). At the time of cooling after the sintering, due to the heat shrinkage larger than the photocatalyst fine particles of the polytetrafluoroethylene resin and the non-fusion property of the polytetrafluoroethylene resin to the photocatalyst fine particles, the photocatalytic fine particles and the polytetrafluoroethylene resin An air layer forms between them.

The photocatalyst structure with a light source of the present invention can be used in any application involving a photocatalytic reaction such as purification of gas or liquid. At this time, the substrate to be subjected to the photocatalytic reaction is sealed in the space where the photocatalytic structure is arranged, or the photocatalytic reaction is performed by irradiation from the light source while the substrate is circulated along the sheet of the photocatalytic structure. Will be In the case of a mesh sheet, the substrate can be caused to flow in the direction along the rod-shaped light source, so that the probability of contact with the substrate is increased, the residence time is lengthened, and the reaction rate can be increased.

[0034]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments and the like specifically showing the configuration and effects of the present invention will be described below.

Example 1 Dispersion of tetrafluoroethylene PTFE and an anatase type photocatalyst (titanium oxide powder, average particle size 7n)
m) at a ratio of 4: 1 (dry weight ratio) was applied to both sides of a glass cloth having a thickness of 50 μm, and then 38
A photocatalyst-carrying sheet (thickness: 70 μm, adhesion amount: 10 g / m ² ) fired at 0 ° C. was prepared. This is 100mm (width)
× 5600 mm (long), and continuously cut every 100 mm in the length direction of the sheet at the center of the width of the photocatalyst supporting sheet.
A 30 mm hole was drilled. As shown in FIG. 1, a hole is formed in the hole of the sheet and the center of the hole, and a rod-shaped UV lamp (20 W, BLB, 20 W, BLB, φ30m
m, lamp length 560 mm). This is the structure A
And

Comparative Example 1 Using the same photocatalyst-carrying sheet as in Example 1, as shown in FIG. 2, a 100 mm-wide photocatalyst-carrying sheet was bellow-folded (with a bellows wavelength of 20 mm) without making a hole. On one surface, the same lamp as described above was installed at the center of the bellows fold line and perpendicular to the fold line. This is called structure B
And

Evaluation Test 1 As shown in FIG. 3, 32 L (0.2 × 0.2 × 0.8
m) Put the electric fan 5 into the evaluation box, place the structures A and B with lamps at the center of each box, and formaldehyde 1
At a concentration of 00 ppm, the concentration of carbon dioxide was measured after 5 minutes and after 30 minutes from the lamp lighting. After 30 minutes, the carbon dioxide gas (decomposition product) concentration in the structure A was 50 ppm, and the concentration in the structure B was 20 ppm.

Example 2 Tetrafluoroethylene PTFE dispersion and an anatase type photocatalyst (titanium oxide powder, average particle size 7 nm)
Was applied to a 16-mesh glass cloth having a thickness of 180 μm, and then baked at 380 ° C. (thickness: 250).
μm, and an adhesion amount of 45 g / m ² ). Since the mesh sheet was hard to be bent at an acute angle, it was bent in a loop as described below. This is 100mm (width)
× 11,200 mm (length), and cut 100 mm in the length direction of the sheet at the center of the width of the photocatalyst-supporting mesh sheet.
A hole of φ30 mm was continuously drilled every time. As shown in FIG. 4, the holes of the sheet and the central portion of the holes are bent in a loop to form bellows (bellows wavelength 10 mm, amplitude 9).
5 mm), a rod-shaped UV lamp (20 W, BLB, 30 mm, lamp length 560 mm) was inserted into the communicating hole of the structure. This was designated as structure C.

Comparative Example 2 Using the same photocatalyst-carrying mesh sheet as in Example 2, the photocatalyst-carrying mesh sheet having a width of 100 mm was bellow-folded (with a bellows wavelength of 10 mm) without making holes, as shown in FIG. , Amplitude 95 mm), on one side of the structure, the same lamp as above at the center of the bellows fold line,
It was installed at right angles to the folding line. This was designated as structure D.

Evaluation Test 2 In the same manner as in Evaluation Test 1, the carbon dioxide gas concentration was measured after 5 minutes and 30 minutes after the lamp was turned on. After 30 minutes, the concentration of carbon dioxide (decomposition product) in the structure C is 80 ppm, and the structure D
Was 50 ppm.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a photocatalyst structure with a light source according to a first embodiment.

FIG. 2 is a perspective view showing a photocatalyst structure with a light source of Comparative Example 1.

FIG. 3 is a perspective view showing an apparatus used in an evaluation test.

FIG. 4 is a perspective view showing a photocatalyst structure with a light source according to a second embodiment.

FIG. 5 is a perspective view showing a photocatalyst structure with a light source of Comparative Example 2.

FIG. 6 is a view showing another photocatalyst structure of the present invention.

[Description of Signs] 1 Sheet-like object 1a Insertion part 1b Bend part 2 Bar-shaped light source 3 Sheet-like object (mesh type)

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) B01J 21/06 B01D 53/36 ZABJ F-term (Reference) 4C080 AA07 BB02 BB04 BB06 CC01 HH05 JJ03 KK08 LL02 LL03 LL02 MM02 NN01 NN02 NN22 QQ11 4D048 AA19 AB03 BA07X BA41X BB08 BB20 CA01 CC10 CC36 CC41 EA01 4G069 AA03 AA08 BA04B BA48A CA01 CA05 CA10 CA17 DA06 EA07 EA30 EC22X EE10 FA03 FB13

Claims (4)

[Claims] 1. A photocatalyst structure with a light source, wherein a rod-like light source insertion portion is provided in a sheet-like material carrying a photocatalyst, and is locked by the inserted rod-like light source. 2. The photocatalyst structure with a light source according to claim 1, wherein the sheet-like material is a continuous sheet bent alternately a plurality of times and provided with an insertion portion for each bending unit. 3. The photocatalyst structure with a light source according to claim 1, wherein the sheet-like material is a mesh-like sheet carrying a photocatalyst. 4. A photocatalyst structure in which a continuous body of a sheet-like material carrying a photocatalyst is alternately bent a plurality of times to provide a rod-shaped light source insertion portion for each bending unit.