JP2021084082A - Photocatalyst-carrying sheet as well as air cleaner and water treatment device using the same - Google Patents

Abstract

To provide a photocatalyst-carrying sheet in which a photocatalyst layer made of anatase type titanium oxide and rutile-type titanium oxide is efficiently generated, and the efficiency of purification treatment by photocatalyst is significantly improved, and provide a method for manufacturing the sheet.SOLUTION: A photocatalyst-carrying sheet S1 is constituted of a wire net made of metal titanium and includes a photocatalyst layer 5 having a photocatalytic function on which anatase type titanium oxide and rutile-type titanium oxide, which are formed by heating anatase type titanium oxide and organic titania are randomly arranged, on the surface of a metal titanium 1 covered by a thin anodic oxide film 3. A method for manufacturing the photocatalyst-carrying sheet comprises processes of: mixing anatase type titanium oxide and organic titania and dispersing them into solvent; coating, with dispersion liquid, metal titanium on the surface of which an anodic oxide film is formed; and heating it to 250°C to 800°C in the presence of oxygen to obtain a photocatalyst layer 5 in which anatase type titanium oxide and rutile-type titanium oxide are mixed.SELECTED DRAWING: Figure 1

Description

The present invention relates to a photocatalyst-supported sheet and an air purifier and a water treatment device using the sheet. More specifically, the present invention relates to a photocatalyst-supporting sheet having a photocatalyst layer in which anatase-type titanium oxide and rutile-type titanium oxide are mixed, and an air purifier and a water treatment device using the sheet.

Anatase-type titanium oxide is known as a photocatalyst, and holes are generated by irradiation with ultraviolet rays to generate active species such as ^{hydroxyl radical (OH −).} As a result, organic substances are decomposed, so that deodorizing and sterilizing effects can be obtained, and they are applied to air purifiers and the like. For example, Patent Document 1 and Patent Document 2 are known as those using anatase-type titanium oxide as a photocatalyst.
In Patent Document 1 and Patent Document 2, a large number of fine flow paths penetrating the front and back surfaces are formed by performing etching treatment with an aperiodic pattern from one side or both sides of the titanium foil. Next, a titanium oxide base formed by an anodic oxide film is formed on the surface of a titanium foil having an aperiodic sponge structure in which a large number of fine flow paths are formed. Then, a photocatalyst sheet in which anatase-type titanium oxide particles are printed on the titanium oxide base is disclosed.

According to this, the photocatalyst sheet firmly supports the anatase-type titanium oxide as a photocatalyst, prevents the anatase-type titanium oxide from peeling off, and further increases the chance that the fluid comes into contact with the photocatalyst, and purifies the photocatalyst. It is said that the efficiency can be significantly improved. However, in Patent Document 1, since the titanium foil is etched, there is a concern that the manufacturing cost will increase, and further improvement of the technique such as suppressing the cost is required.
On the other hand, Patent Document 3 is known as an example using another metal. Patent Document 3 has a plurality of openings on the metal surface, and is formed so that the opening ratio of the openings is 30% or more and 90% or less with respect to the metal surface, and other than the openings on the metal surface. Supporting a photocatalyst including a metal sheet substrate in which the remaining portion of the metal is roughened (processed to make a rough surface in order to increase the surface area of the metal) and a photocatalyst layer formed on the metal sheet substrate. Metal sheets are disclosed.

Japanese Patent No. 5474612 International Publication WO2018 / 147444 Japanese Unexamined Patent Publication No. 2005-254167

However, when anatase-type titanium oxide and a metal substrate other than titanium are used, there is a problem that the activity of the anatase-type titanium oxide is lowered and the purification treatment efficiency by the photocatalyst is lowered.
Further, there is a problem that anatase-type titanium can be activated only by ultraviolet light having a band gap of 388 nm or less.
Further, although the rutile-type titanium crystal is effective in light of 420 nm or less, there is a problem that the purification efficiency is lowered because the band gap is small.

According to the present invention, a photocatalyst layer composed of anatase-type titanium oxide and rutile-type titanium oxide is efficiently generated, and further, by irradiating light including visible light and ultraviolet rays, the chance of the fluid coming into contact with the photocatalyst is increased, and the photocatalyst The purpose is to significantly improve the efficiency of purification treatment.

The photocatalyst-supporting technique of the present invention forms a titanium oxide film on the surface of a titanium foil. This is processed into a sheet in which a large number of fine flow paths penetrating the front and back are formed, anatase-type titanium oxide is applied to the titanium oxide film on the surface, and anatase-type titanium oxide and rutile-type titanium oxide are randomly distributed by heating. By arranging and adhering to the photocatalyst layer, a photocatalyst layer is efficiently formed. Furthermore, by irradiating the anatase-type titanium oxide and rutile-type titanium oxide on the sheet on which a large number of microchannels are formed with light containing visible light and ultraviolet light, the opportunity for the fluid to come into contact with the photocatalyst is increased, and the photocatalyst is increased. It is characterized by remarkably improving the purification treatment efficiency by.

In order to solve the above problems, the photocatalyst-supporting sheet S1 according to the first aspect of the present invention is made of a metal mesh made of metallic titanium and covered with a thin anodized film, as shown in FIG. 1, for example. A photocatalytic layer having a photocatalytic function is provided on the surface of titanium, in which anatase-type titanium oxide and rutile-type titanium oxide formed by heating anatase-type titanium oxide and organic titania (organic titanium oxide) are randomly arranged. It is a feature.
Here, rutile-type titanium oxide is formed by transition (500 ° C. to 900 ° C.) from anatase-type titanium oxide by heating. Further, the decomposition performance is improved by heating the anatase-type titanium oxide to form a photocatalyst layer rather than mixing the anatase-type titanium oxide and the rutile-type titanium oxide to form a photocatalyst layer. Further, by irradiating the anatase-type titanium oxide and rutile-type titanium oxide on the sheet on which a large number of fine flow paths are formed with light containing visible light and ultraviolet light, the purification treatment efficiency by the photocatalyst can be improved.
With such a configuration, the purification treatment efficiency by the photocatalyst can be remarkably improved by forming a large number of fine flow paths penetrating the front and back and using the catalytic reaction of two lights having different wavelengths.

Further, in the photocatalyst-supporting sheet S1 according to the second aspect of the present invention, in the first aspect, the heat treatment temperature of anatase-type titanium oxide and rutile-type titanium oxide is 250 ° C. to 800 ° C., and the heating time is 15 minutes to 10 minutes. Time, the ratio of anatase-type titanium oxide to rutile-type titanium oxide is 2: 8 to 8: 2, and the ratio of crystalline titanium oxide composed of the anatase-type titanium oxide and the rutile-type titanium oxide to organic silicon is 2: It is characterized by being 8 to 8: 2.
With such a configuration, the efficiency of the purification treatment by the photocatalyst can be remarkably improved by using appropriate manufacturing conditions of the photocatalyst-supported sheet.

Further, in the air purifier 10A according to the third aspect of the present invention, for example, as shown in FIG. 3, the photocatalyst-supporting sheet S1 according to the first or second aspect and the photocatalyst-supporting sheet S1 are covered with ultraviolet rays and ultraviolet rays. It is provided with a light source 6 that irradiates visible light, and the photocatalyst is characterized in that it receives ultraviolet rays and visible light and decomposes organic gas or bacteria that come into contact with the photocatalyst.
With this configuration, a photocatalyst-supported sheet with high purification treatment efficiency is used, and the catalytic reaction is used with ultraviolet rays and visible light. Therefore, the purification treatment efficiency by the air purifier according to the first or second aspect is remarkably improved. Be made to.

Further, in the water treatment device 20A according to the fourth aspect of the present invention, for example, as shown in FIG. 7, the photocatalyst-supporting sheet S1 according to the first or second aspect and the photocatalyst-supporting sheet S1 are covered with ultraviolet rays and ultraviolet rays. A light source 6 that irradiates visible light and a water tank 22 that floats the photocatalyst-supporting sheet S1 on the water surface or submerges it in water to hold the photocatalyst. It is characterized by decomposing organic gas, bacteria or organic substances dissolved in water.
With this configuration, a photocatalyst-supported sheet with high purification treatment efficiency is used, and the catalytic reaction is used with ultraviolet rays and visible light, so that the purification treatment efficiency by the water treatment device can be significantly improved.

Further, the method for producing the photocatalyst-supported sheet S1 according to the fifth aspect of the present invention is, for example, as shown in FIG. 2, a step of mixing anatase-type titanium oxide and organic titania and dispersing them in a solvent (S106). When,
A step of applying a dispersion liquid in which anatase-type titanium oxide and organic titania are dispersed in a solvent to metallic titanium having an anodic oxide film formed on the surface (S107).
It is characterized by comprising a step (S108) of obtaining a photocatalyst layer in which anatase-type titanium oxide and rutile-type titanium oxide are mixed by heating to 250 ° C. to 800 ° C. in the presence of oxygen.
With this configuration, a method for producing a photocatalyst-supported sheet in which the efficiency of purification treatment by a photocatalyst can be significantly improved by forming a large number of fine flow paths penetrating the front and back and using a catalytic reaction of two lights having different wavelengths. Can be provided.

Further, in the method for producing the photocatalyst-supporting sheet S1 according to the sixth aspect of the present invention, the heat treatment temperature between the anatase-type titanium oxide and the rutile-type titanium oxide is 250 ° C. in the method for producing the photocatalyst-supporting sheet according to the fifth aspect. ~ 800 ° C., heating time 15 minutes to 10 hours, ratio of anatase type titanium oxide to rutile type titanium oxide is 2: 8 to 8: 2, the anatase type titanium oxide and the rutile type titanium oxide in the photocatalyst layer It is characterized in that the ratio of crystalline titanium oxide composed of organic silicon to organic silicon is 2: 8 to 8: 2.
With such a configuration, the efficiency of the purification treatment by the photocatalyst can be remarkably improved by using the optimum production conditions of the photocatalyst-supported sheet.

According to the present invention, a photocatalyst layer composed of anatase-type titanium oxide and rutile-type titanium oxide is efficiently generated, and further, by irradiating light including visible light and ultraviolet light, the opportunity for the fluid to come into contact with the photocatalyst is increased. Therefore, the purification treatment efficiency by the photocatalyst can be remarkably improved.

It is a figure which shows typically the photocatalyst supporting sheet which concerns on Example 1. FIG. It is a figure which shows the manufacturing method of the photocatalyst-supporting sheet which concerns on Example 1. FIG. It is a figure which shows the structure of the air purifier which concerns on Example 2. FIG. It is a figure which shows the use state of the air purifier which concerns on Example 2. FIG. It is a figure which shows the structure of the air purifier which concerns on Example 3. FIG. It is a figure which shows the structure of the air purifier which concerns on Example 4. FIG. It is a figure which shows the structure of the water treatment apparatus which concerns on Example 5. It is a figure which shows the structure of the water treatment apparatus which concerns on Example 6.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In each figure, the same or corresponding devices and parts are designated by the same reference numerals, and duplicate description will be omitted.

FIG. 1 schematically shows a photocatalyst-supported sheet S1 according to Example 1. In the figure, a large number of micropores 2 are formed on the surface of the titanium foil 1. These a large number of micropores 2 form a large number of microchannels penetrating the front and back, and serve as a flow path for a fluid such as a gas or a liquid. A thin oxide film is formed on the surface of the titanium foil 1 by anodizing, and serves as a base (titanium oxide base) 3 of a layer formed on the thin oxide film. Then, titanium oxide crystal grains 4 (indicated by "・" in the figure) composed of minute anatase-type titanium oxide crystals and rutile-type titanium oxide crystals are mixed and sintered and fixed on the titanium oxide base 3. There is. The size of the micropore 2 is about 0.5 μm. Since both the anatase-type titanium oxide and the rutile-type titanium oxide have a photocatalytic function, the layer having the sintered and fixed titanium oxide crystal grains 4 functions as the photocatalytic layer 5. The sheet in which the photocatalyst layer 5 is fixed to the titanium foil 1 having a large number of micropores 2 functions as the photocatalyst-supported sheet S1. The sheet is not limited to a flat surface, and can be used, for example, in a cylindrical shape. That is, when the photocatalyst layer 5 is irradiated with a predetermined light, the decomposition reaction of the organic substance is promoted. Anatase-type titanium crystals exert a catalytic function in ultraviolet light of 388 nm or less, and rutile-type titanium crystals exert a catalytic function in light of 420 nm or less, and decompose organic substances. In the formation of the photocatalyst layer 5, organic silicon is mixed with the anatase-type titanium oxide in order to fix the photocatalyst layer 5 and to improve the specific surface area of the photocatalyst layer 5. The photocatalyst-supported sheet S1 can be used in an air purifier or a water treatment device.

There are three types of crystal structures of titanium oxide: a high-temperature rutile type belonging to a tetragonal system, a low-temperature anatase type, and an orthorhombic brookite type. Of these, the two most common are tetragonal crystal types. In terms of photoactivity, the anatase-type bandgap is 3.2 eV, the rutile-type bandgap is 3.0 eV, and the anatase-type bandgap is 0.2 eV higher. Therefore, anatase-type titanium oxide is said to be more effective. Due to its band structure, the light that can be used for the photocatalytic reaction of titanium oxide is ultraviolet light of 388 nm or less for anatase-type titanium oxide and visible light of 418 nm or less for rutile-type titanium oxide.
When titanium oxide comes into contact with air or water and the surface is exposed to light, electrons and holes are generated in the conduction band and valence band, respectively, and promote the photocatalytic reaction. In particular, holes have a strong oxidizing power and oxidize various compounds. Further, when the titanium oxide is exposed to light, the surface of the titanium oxide becomes more wet with water. In addition, it has bactericidal properties and can not only kill bacteria but also decompose carcasses. Furthermore, it has deodorizing and antiviral effects and can be applied to air purifiers. Furthermore, applied research is underway to reduce sulfur oxides (SO _X ) and nitrogen oxides (NO _X).

FIG. 2 shows a method for producing a photocatalyst-supported sheet according to Example 1. First, the titanium foil 1 is prepared. A thin titanium oxide film is formed on the surface by anodizing (S101). Next, a resist is applied, exposed, and patterned on both sides (or one side) of the titanium foil 1 (S102). Next, etching is performed from both sides of the patterned titanium foil 1 (from one side if the resist coating is one side) (S103). For etching, for example, a mixed acid solution of hydrofluoric acid and nitric acid, ammonia and hydrogen peroxide, or the like can be used. Also, for example, dry etching can be used. Next, when the resist is peeled off (S104), a mesh in which porous microchannels (a large number of micropores 2) are formed can be obtained (S105). For resist stripping, for example, acetone, oxygen gas plasma, or the like can be used. On the other hand, a solution in which anatase-type titanium oxide is dispersed is prepared (S106). Next, a solution in which anatase-type titanium oxide is dispersed is applied to a porous microchannel mesh (S107). As the dispersion liquid, for example, an organic solvent such as a lower alcohol or water can be used. Next, the titanium foil 1 coated with the solution in which the anatase-type titanium oxide is dispersed is heated, and the anatase-type titanium oxide and the heat-generated rutile-type titanium oxide are baked and fixed to the titanium foil 1 (S108). .. The heating temperature is, for example, 300 ° C. to 1000 ° C. and the heating time is 20 minutes to 2 hours. As a result, the photocatalyst-supported sheet S1 is manufactured (S109).

Tables 1 and 2 show the measurement results of the reduction rate of acetaldehyde when the photocatalyst-supported sheet S1 was used.

Crystalline titanium oxide (mixed crystal of anatase-type titanium oxide crystal and rutile-type titanium oxide crystal): Organic titania: organic silicon charge ratio, and anatase-type titanium oxide in crystalline titanium oxide: rutile-type titanium oxide charge ratio , And the heating conditions (heating temperature and heating time) were changed to prepare a sample and measured. Table 1 shows the measurement results when the heating time is 2 hours, and Table 2 shows the measurement results when the heating time is 20 minutes. For the measurement of acetaldehyde concentration, for example, an HPLC method, a gas chromatograph method, a colorimetric method, or a fluorescence method can be used. In this example, the photoacoustic field gas monitor (MODEL 1412) method was used.

From the measurement results, the following can be said.
(A) With 365 nm light (due to anatase-type titanium oxide). Although a reduction rate of about 80% or more of acetaldehyde can be obtained, it is difficult to obtain a reduction rate of about 50% or more of acetaldehyde with light of 405 nm (possible with both anatase-type titanium oxide and rutile-type titanium oxide).
(B) There is no great difference in the reduction rate of acetaldehyde between the heat treatment time of 20 minutes and 2 hours. From this, it is estimated that the heat treatment time is appropriate from 15 minutes to 2.5 hours.
(C) The heat treatment temperature is 300 ° C. to 750 ° C., and the reduction rate of acetaldehyde can be about 80% or more with light of 365 nm, but not about 20% or more at 900 ° C. to 1000 ° C. Further, with light of 405 nm, a reduction rate of about 30% to 50% or more of acetaldehyde can be realized in a sample in which crystalline titanium oxide and organic titania (organic titanium oxide are mixed) at 300 ° C. to 500 ° C. From this, it is estimated that the heat treatment temperature is appropriate at 250 ° C to 800 ° C. It should be noted that the organic titania is mixed in the heat treatment only with crystalline titanium oxide, although only large pores are generated, but by adding the organic titania. This is because a photocatalyst having a better pore distribution can be formed. Further, the mixing of organic silicon contributes to the good adhesion of the photocatalyst and also to the good pore distribution as in the case of organic titania. And a good maximum distribution also contributes to the promotion of decomposition of organic matter and the promotion of adsorption of odors.

(D) From the data of the charge ratio, it is possible to reduce acetaldehyde by about 80% or more with light of 365 nm. This can be achieved with a sample in which crystalline titanium oxide and organic titania are mixed and a sample with only crystalline titanium oxide, but it is difficult to achieve an acetaldehyde reduction rate of about 25% or more with a sample containing only organic titanium oxide. .. In addition, it is difficult to reduce acetaldehyde by about 50% or more with light of 405 nm, but in a sample in which crystalline titanium oxide and organic titania are mixed at 300 ° C to 500 ° C (at the time of coating), acetaldehyde is used. A reduction rate of about 30% to 50% or more has been achieved. From this, it is estimated that a sample in which crystalline titanium oxide and organic titania are mixed is appropriate, and a ratio of 2: 8 to 8: 2 is appropriate.
(E) From the data of the charging ratio, it is possible to reduce acetaldehyde by about 80% or more with light of 365 nm. This can be achieved with a sample having a ratio of anatase-type titanium oxide to rutile-type titanium oxide of about 2: 8 to 8: 2, but it may not be realized with a sample having a ratio of about 2: 8 or less. Further, it is difficult to reduce acetaldehyde by about 50% or more with light of 4050 nm, but a sample having a ratio of anatase-type titanium oxide to rutile-type titanium oxide of about 2: 8 to 8: 2 at 300 ° C. to 500 ° C. Therefore, the reduction rate of acetaldehyde of about 30% to 50% or more can be realized, but it may not be realized in the sample of about 2: 8 or less. From this, it is estimated that the ratio of anatase-type titanium oxide to rutile-type titanium oxide is appropriate at 2: 8 to 8: 2.

As described above, the photocatalyst-supporting sheet S1 according to the present embodiment efficiently generates a photocatalyst layer composed of anatase-type titanium oxide and rutile-type titanium oxide, and further irradiates light including visible light and ultraviolet light to make a fluid. Can increase the chances of contact with the photocatalyst, and the efficiency of purification treatment by the photocatalyst can be significantly improved.

FIG. 3 shows the configuration of the air purifier 10A according to the second embodiment. The photocatalyst-supported sheet S1 has a cylindrical shape and is arranged around a cylindrical light source 6. The light source 6 emits ultraviolet rays of 405 nm or less, and for example, a mercury lamp, an LED, or the like can be used. Sunlight can also be used outdoors. The light source 6 is connected to the power source 7 to obtain electrical energy. A battery is shown here as the power source 7, but if it can be connected to a commercial power source, it may be connected to a commercial power source.

FIG. 4 shows the usage status of the air purifier 10A according to the second embodiment. The air purifier 10A is arranged in the duct 11. The air 12 flowing in the duct 11 comes into contact with the photocatalyst-supported sheet S1 to decompose and purify organic substances and the like in the air.
Since the photocatalyst-supporting sheet S1 described in Example 1 is used for the air purifier 10A, the photocatalyst layer 5 composed of anatase-type titanium oxide and rutile-type titanium oxide is efficiently generated as in Example 1. Furthermore, by irradiating light including visible light and ultraviolet light, the opportunity for the fluid to come into contact with the photocatalyst can be increased, and the purification treatment efficiency by the photocatalyst can be remarkably improved.

FIG. 5 shows the configuration of the air purifier 10B according to the third embodiment. A photocatalyst-supporting sheet S1, a light source 6, and a power source 7 are arranged in a room (room enclosure 15). The photocatalyst-supported sheet S1 has a flat plate shape and is arranged on both sides of the light source 6 with the light source 6 interposed therebetween. The light source is not limited to a cylindrical shape, but may be a flat plate shape. A filter 13 is arranged on one side of the room and a fan 14 is arranged on the other side. Air flows from the filter 13 toward the fan 14 and comes into contact with the photocatalyst-supported sheet S1 arranged in the middle to decompose organic substances and the like in the air. , Will be cleaned.
Since the photocatalyst-supporting sheet S1 described in Example 1 is used for the air purifier 10B, a photocatalyst layer 5 composed of anatase-type titanium oxide and rutile-type titanium oxide is efficiently generated, and visible light and ultraviolet rays are further generated. By irradiating light containing light, the chance that the fluid comes into contact with the photocatalyst can be increased, and the purification treatment efficiency by the photocatalyst can be remarkably improved.

FIG. 6 shows the configuration of the air purifier 10C according to the fourth embodiment. The photocatalyst-supported sheet S1 is placed outdoors. The photocatalyst-supported sheet S1 is irradiated with sunlight 6A, and the fan 14 causes air 12 to flow on the surface of the photocatalyst-supported sheet S1. As a result, a photocatalytic reaction is caused outdoors to purify the air in the vicinity of the air purifier 10C.
Since the photocatalyst-supporting sheet S1 described in Example 1 is used for the air purifier 10C, the photocatalyst layer 5 composed of anatase-type titanium oxide and rutile-type titanium oxide is efficiently generated as in Example 1. Further, by irradiating light including visible light and ultraviolet light, the opportunity for the fluid to come into contact with the photocatalyst can be increased, and the purification treatment efficiency by the photocatalyst can be remarkably improved.

FIG. 7 shows the configuration of the water treatment device 20A according to the fifth embodiment. Water 21 is placed in the water tank 22, and the photocatalyst-supporting sheet S1 is floated on the surface thereof. The water 21 is agitated by the stirrer 23 so that a large amount of water comes into contact with the photocatalyst-supported sheet S1. When the photocatalyst-supporting sheet S1 is irradiated with light from the light source 6B, a photocatalyst reaction occurs with the water in contact with the photocatalyst-supporting sheet S1, organic substances in the water are decomposed, and the water is purified. As the light source 6B, an LED, a mercury lamp, sunlight or the like can be used.
Since the photocatalyst-supporting sheet S1 described in Example 1 is used in the water treatment device 20A, the photocatalyst layer 5 composed of anatase-type titanium oxide and rutile-type titanium oxide is efficiently generated as in Example 1. Further, by irradiating light including visible light and ultraviolet light, the opportunity for the fluid to come into contact with the photocatalyst can be increased, and the purification treatment efficiency by the photocatalyst can be remarkably improved.

FIG. 8 shows the configuration of the water treatment device 20B according to the sixth embodiment. The light source 6 is enclosed in a glass dome 24 made of quartz or the like, and a photocatalyst-supporting sheet S1 is arranged around the glass dome 24. Put the water 21 in the water enclosure 25. The power source 7 is arranged outside the water enclosure 25 and connected to the light source 6. The light source 6, the glass dome 24 made of quartz or the like, and the photocatalyst-supported sheet S1 are immersed in water 21. The water 21 is agitated by the stirrer 23 so that a large amount of water 21 comes into contact with the photocatalyst-supported sheet S1. The photocatalyst is immersed in the water 21 and the photocatalyst layer 5 is irradiated with light from the light source 6 which is prevented from getting wet with the water 21.
When the photocatalyst-supporting sheet S1 is irradiated with light from the light source 6B, a photocatalyst reaction occurs with the water in contact with the photocatalyst-supporting sheet S1, organic substances in the water are decomposed, and the water is purified. As the light source 6B, an LED, a mercury lamp, or the like can be used.
Since the photocatalyst-supporting sheet S1 described in Example 1 is used in the water treatment device 20B, the photocatalyst layer 5 composed of anatase-type titanium oxide and rutile-type titanium oxide is efficiently generated as in Example 1. Further, by irradiating light including visible light and ultraviolet light, the opportunity for the fluid to come into contact with the photocatalyst can be increased, and the purification treatment efficiency by the photocatalyst can be remarkably improved.

Although the embodiments of the present invention have been described above, the embodiments are not limited to the above examples, and it is clear that various modifications can be made without departing from the spirit of the present invention.

For example, it can be used for water purification for aquaculture and plants, exhaust treatment, air and water purification for schools, kindergartens, commercial buildings, nursing homes, libraries, etc. where people gather.

The present invention is used for air purifiers and water treatment devices.

S1 Photocatalyst supporting sheet 1 Titanium foil 2 Micropores 3 Titanium oxide base 4 Titanium oxide crystal grains 5 Photocatalyst layers 6, 6A, 6B Light source 7 Power supply 10A, 10B, 10C Air purifier 11 Duct 12 Air 13 Filter 14 Fan 20A, 20B Water Processor 21 Water 22 Water tank 23 Stirrer 24 Glass dome 25 Water enclosure

Claims (6)

Anatase-type titanium oxide and rutile-type titanium oxide formed by heating anatase-type titanium oxide and organic titania are formed on the surface of the metallic titanium, which is composed of a wire mesh made of metallic titanium and is covered with a thin anodized film. It is characterized by having a photocatalytic layer having a photocatalytic function arranged at random;
Photocatalyst-supported sheet. The heat treatment temperature of the anatase-type titanium oxide and the rutile-type titanium oxide is 250 ° C. to 800 ° C., and the heating time is 15 minutes to 10 hours.
The ratio of the anatase-type titanium oxide to the rutile-type titanium oxide is 2: 8 to 8: 2,
The ratio of crystalline titanium oxide composed of the anatase-type titanium oxide and the rutile-type titanium oxide to organic silicon is 2: 8 to 8: 2.
The photocatalyst-supported sheet according to claim 1. With the photocatalyst-supported sheet according to claim 1 or 2.
The photocatalyst-supported sheet is provided with a light source for irradiating ultraviolet rays and visible light;
The photocatalyst is characterized by receiving the ultraviolet rays and visible light and decomposing organic gases or bacteria in contact with the photocatalyst;
air purifier. The photocatalyst-supported sheet according to claim 1 or 2.
A light source that irradiates the photocatalyst-supported sheet with ultraviolet rays and visible light,
It is provided with a water tank in which the photocatalyst-supporting sheet is floated on the surface of water or submerged in water to hold the sheet;
The photocatalyst is characterized by receiving the ultraviolet rays and visible light and decomposing organic gases, bacteria or organic substances dissolved in the water surface or water in contact with the photocatalyst;
Water treatment device. The process of mixing anatase-type titanium oxide and organic titania and dispersing them in a solvent,
A step of applying a dispersion liquid in which the anatase-type titanium oxide and the organic titania are dispersed in the solvent to metallic titanium having an anodic oxide film formed on the surface thereof.
It is characterized by comprising a step of heating to 250 ° C. to 800 ° C. in the presence of oxygen to obtain a photocatalytic layer in which the anatase-type titanium oxide and the rutile-type titanium oxide are mixed;
A method for producing a photocatalyst-supported sheet. The heat treatment temperature of the anatase-type titanium oxide and the rutile-type titanium oxide is 250 ° C. to 800 ° C., and the heating time is 15 minutes to 10 hours.
The ratio of the anatase-type titanium oxide to the rutile-type titanium oxide is 2: 8 to 8: 2,
The photocatalyst layer is characterized in that the ratio of crystalline titanium oxide composed of the anatase-type titanium oxide and the rutile-type titanium oxide to organic silicon is 2: 8 to 8: 2.
The method for producing a photocatalyst-supported sheet according to claim 5.

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