JP2014124630A - Photocatalyst carrier and method for manufacturing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a photocatalyst carrier capable of being deformed at will, even after a photocatalyst has been carried thereon, in accordance with the shape and size of a housing container, etc., of avoiding the falling of the carried photocatalyst and the collapse of the carrier itself as a result of a photocatalytic function, and of abating a pressure loss as a filter material; and a method for manufacturing the same.SOLUTION: A photocatalyst carrier and a method for manufacturing the same are disclosed. The photocatalyst carrier of the present invention is provided by carrying a photocatalyst on a metal-coated flexible porous body. According to the present invention, it becomes possible to efficiently manufacture a photocatalyst filter material having excellent pollutant cleanup performances such as decomposition, adsorption. The photocatalyst carrier of the present invention is useful as filters for a water purifier, air purifier, etc., for example.

Description

  TECHNICAL FIELD The present invention relates to a photocatalyst carrier and a method for producing the same, and more particularly, is a light-weight photocatalyst carrier that can be deformably accommodated in a space having various shapes or sizes as a photocatalyst filter material. And a manufacturing method thereof.

  A photocatalyst carrier in which a photocatalyst such as titanium dioxide is supported on a substrate having pores is known. Such a photocatalyst carrier, for example, can be used as a filter material to decompose and remove pollutants (gas, organic substances, etc. that become malodorous components) in a polluted environment through light irradiation such as sunlight, It is applied to various fields such as water purification equipment.

  Such a photocatalyst carrier can be produced, for example, by supporting photocatalytic titanium oxide on a porous body made of ceramics (Patent Documents 1 to 3). However, since such a ceramic base material is hard, it is difficult to deform it according to the shape and size of the container or the attachment location to be accommodated after the carrier is manufactured.

  On the other hand, in order to enable deformation according to the shape and size of a container or the like to be accommodated after carrying the photocatalyst, a so-called flexible porous substrate including elasticity, elasticity, or flexibility is included. There is known a method of supporting photocatalytic titanium oxide on the base material by using the above.

  This includes, for example, a technique of supporting photocatalytic titanium oxide on a film-forming target by a sputtering method (Patent Document 4), a technique of directly mixing photocatalytic titanium oxide into a urethane sponge or the like (Patent Document 5), and photocatalytic oxidation of paper pulp. The technique (patent document 6) which fixes titanium can be mentioned.

  However, the porous bodies (base materials) used for these are all made of an organic substance in order to achieve their flexibility. As a result, when exposed to light for a predetermined time, decomposition of the base material itself proceeds due to the supported photocatalyst, and the supported photocatalyst falls off or the support itself collapses. There is.

  Furthermore, a technique (Patent Document 7) in which photocatalytic titanium oxide is attached to a short fiber such as a porous glass fiber and used in a purification device is also known. However, the purification device described in Patent Document 7 has another problem that the pressure loss of the fluid passing through the glass fiber structure group becomes large.

Japanese Patent Laid-Open No. 2003-119085 JP 2003-053194 A JP 2004-351181 A JP 2003-342722 A JP 2001-190470 A JP 2001-310126 A Japanese Patent Laid-Open No. 2004-160452

  An object of the present invention is to solve the above-mentioned problems, and the object of the present invention is that it can be arbitrarily modified according to the shape and size of a container or the like to be accommodated after carrying the photocatalyst, and depends on the photocatalytic function. An object of the present invention is to provide a photocatalyst carrier and a method for producing the same, in which the supported photocatalyst is prevented from falling off or the carrier itself is collapsed and the pressure loss as a filter material is reduced.

  The present invention is a photocatalyst carrier in which a photocatalyst is carried on a flexible porous body coated with a metal.

  In one embodiment, the photocatalyst is at least one metal oxide selected from the group consisting of titanium dioxide, tin oxide, zinc oxide, tungsten oxide, strontium titanate, and iron oxide.

  In one embodiment, the photocatalyst has a loading of 0.05% to 50% by weight relative to the total weight.

  In one embodiment, the metal is at least one metal selected from the group consisting of titanium, copper, silver, gold, platinum, nickel, tin, zinc, tungsten, ruthenium, and strontium.

  In one embodiment, the flexible porous body has a sponge-like structure.

The present invention is also a method for producing a photocatalyst carrier,
Coating a flexible porous body with a metal to obtain a coated porous body; and applying a photocatalyst to the coated porous body;
A method comprising

  In one embodiment, the application of the photocatalyst is performed by a sputtering method, a vacuum deposition method, a thermal spraying method, a sol-gel method, a spray coating method, or a dip coating method.

  In one embodiment, the photocatalyst is at least one metal oxide selected from the group consisting of titanium dioxide, tin oxide, zinc oxide, tungsten oxide, strontium titanate, and iron oxide.

  In one embodiment, the photocatalyst has a loading of 0.05% to 50% by weight relative to the total weight.

  In one embodiment, the metal is at least one metal selected from the group consisting of titanium, copper, silver, gold, platinum, nickel, tin, zinc, tungsten, ruthenium, and strontium.

  In one embodiment, the flexible porous body has a sponge-like structure.

  According to the present invention, it is possible to provide a photocatalytic filter material that is light in weight and can be deformably accommodated in a space having various shapes or sizes in handling. The photocatalyst carrier of the present invention can avoid dropping of the supported photocatalyst due to the photocatalytic function or collapse of the carrier itself, and can reduce pressure loss when used as a filter material.

It is a photograph for demonstrating an example of the flexible porous body which comprises the photocatalyst carrier of this invention, Comprising: It is a sponge-like structure body.

  Hereinafter, the present invention will be described in detail.

  In the photocatalyst carrier of the present invention, a photocatalyst is carried on a flexible porous body coated with a metal.

  The flexible porous body constituting the present invention is a porous structure composed of, for example, an organic resin, an organic or inorganic rubber, and / or an organic fiber.

  Examples of organic resins include, but are not limited to, urethane resins such as polyurethane; polyolefin resins such as polyethylene and polypropylene; styrene resins such as polystyrene and ABS (acrylonitrile-butadiene-styrene) resin; polyesters such as polyethylene terephthalate. Examples thereof include resins, polyamide resins such as polyamide, and combinations thereof. Examples of organic rubber include, but are not limited to, natural rubber, synthetic rubber (for example, chloropyrene rubber, ethylene propylene rubber, acrylic rubber, isobrene rubber, urethane rubber, epichlorohydrin rubber, styrene / butadiene rubber, butyl rubber, or these Or a combination thereof. Alternatively, inorganic rubber such as fluorine rubber or silicone rubber may be used. Examples of organic fibers include natural organic fibers (eg, plant fibers such as cotton, hemp or linen, animal fibers such as wool, silk or cashmere, or combinations thereof), synthetic organic fibers (eg, Polyester fiber, acrylic fiber, polyamide fiber, polyvinyl alcohol fiber, or a combination thereof) or a combination thereof. Alternatively, as a specific example of the synthetic organic fiber, Gore-Tex (registered trademark) can be mentioned.

  Examples of the flexible porous body include a sponge-like structure having a sponge shape and integrally formed; a tangled body such as a fabric (for example, a nonwoven fabric, a woven fabric, or a knitted fabric) or a mesh-like structure; The combination of these is mentioned. When an entangled body is used, a product obtained by laminating a plurality of these to have a three-dimensional shape may be used. In the present invention, it is preferable to use a sponge-like structure in terms of excellent versatility.

  Next, an example of a sponge-like structure that can be used as the flexible porous body is shown in FIG.

  FIG. 1 is a photograph for explaining an example of a flexible porous body comprising a sponge-like structure, which is a flexible porous body constituting the photocatalyst carrier of the present invention.

  As shown in FIG. 1, the sponge-like structure that can constitute the present invention has a structure in which a thin skeleton portion is combined with the surrounding area to form innumerable continuous pores.

  The sponge-like structure as described above preferably has the following characteristics.

In the present invention, sponge-like structure, for ^example, have a bulk density of ^{0.02g / cm 3 ~0.06g / cm 3} . When the bulk density satisfies such a range, the structure is configured with a thin skeleton and a high porosity, while sufficiently retaining the filter surface area when used as a photocatalytic filter material. As a result, the surface on which the photocatalyst is carried is sufficiently retained, and the adsorption and decomposition performance of contaminants by the photocatalyst is improved. Furthermore, pressure loss as a filter material can be reduced by such a range. The bulk density of the sponge-like structure can be measured by a method well known to those skilled in the art (for example, submerged weighing method).

  In the present invention, the sponge-like structure has a porosity of 80% to 98%, for example. If the porosity of the structure is less than 80%, the skeleton constituting the structure becomes thick, so that light does not reach the inside of the structure and there is a possibility that a photocatalytic function sufficient as a photocatalytic filter material cannot be exhibited. is there. Further, the pressure loss as a filter may be increased. If the porosity exceeds 98%, the skeleton constituting the structure becomes too thin, and it becomes difficult to give the metal and / or photocatalyst described below, and the skeleton strength of the structure itself may be lowered. The porosity of the sponge-like structure can be measured by a method well known to those skilled in the art (for example, a submerged weighing method).

  In the present invention, the sponge-like structure has, for example, a skeleton part thickness (skeleton thickness) of 0.1 mm to 2 mm. When the skeleton of the structure is less than 0.1 mm, the strength as a filter material is insufficient, and the amount of the photocatalyst supported is limited, so that the obtained support can sufficiently function as a photocatalytic filter material. There is a risk of not. If the skeleton of the structure exceeds 2 mm, it is difficult for light to reach the inside of the structure, and the function of the supported photocatalyst cannot be fully exhibited, and there is a possibility that pressure loss as a filter increases. The skeleton of the sponge-like structure can be measured using a dimensional measuring means well known to those skilled in the art, such as a caliper or a microscope.

  In the present invention, in the sponge-like structure, the average diameter of the pores is, for example, 0.5 mm to 5 mm. Or, for example, 6 to 60 mesh. By having such pores, light reaches the inside of the structure, so that the function of the supported photocatalyst can be further exhibited. Furthermore, the pressure loss as a filter can be reduced. These can be measured or calculated using dimensional measuring means well known to those skilled in the art, such as calipers and microscopes.

  By using the sponge-like structure having the above characteristics, the photocatalyst carrier of the present invention is formed by forming many holes due to this sponge-like structure. As a result, the irradiated UV light reaches not only the surface but also the inside, and the excellent adsorption / decomposition performance with respect to the contaminant as the photocatalytic filter material is further exhibited, and the pressure loss as the filter is also reduced.

  The metal coating on the flexible porous body is performed by a method well known to those skilled in the art. Examples of such coating include sputtering or wet plating.

An example of sputtering will be described. For example, sputtering by DC magnetron sputtering or RF magnetron sputtering is performed on the flexible porous body. Examples of gas species that can be used include Ar, Xe, and Kr. Although the application pressure is not necessarily limited, for example, 1 × 10 ¹ to 1 × 10 ⁻⁴ Pa can be preferably set under a low vacuum.

  The wet plating is performed, for example, as follows: The surface of the flexible porous body is roughened by etching by degreasing oil or the like adhering to the surface. Next, a catalytic metal (Pd—Sn complex) serving as a nucleus of electroless plating is adsorbed, and metal Pd is generated by an oxidation-reduction reaction of the dissolved Sn salt. Thereafter, Ni ions are reduced by electrons released when the reducing agent in the plating solution is oxidized on the catalytically active Pd surface, and a plating film is generated.

  The kind of the metal to be coated is not particularly limited, and examples thereof include titanium, copper, silver, gold, platinum, nickel, tin, zinc, tungsten, ruthenium, and strontium, or a combination thereof. In particular, when titanium oxide (titanium dioxide) is used as a photocatalyst described later, it is preferable to employ titanium as the metal to be coated. This is because a strong bond is generated between each Ti atom of the photocatalytic titanium oxide and the titanium, and it can be expected that a strong support can be achieved.

  Thus, a coated porous body coated with a predetermined metal is obtained. In this coated porous body, the amount of the metal supported on the flexible porous body is, for example, 0.1% by mass to 20% by mass based on the mass of the entire coated porous body. . When the amount of the metal supported is less than 0.1% by mass, a film composed of the metal is not sufficiently formed on the flexible porous body, and the flexible porous body is gradually formed by supporting the photocatalyst described later. It may collapse and it may be difficult to provide a photocatalytic filter material with excellent quality. On the other hand, when the amount of the metal supported exceeds 20% by mass, the manufacturing cost increases, but the original flexibility of the porous body may be impaired. Moreover, the film thickness of the said metal film coat | covered in this way is 10 nm-200 nm, for example. For the reason that stable quality can be provided, it is preferable that variation in film thickness is suppressed and the film thickness is almost constant regardless of location.

  The photocatalyst carrier of the present invention is obtained by carrying a photocatalyst on a flexible porous body (coated porous body) coated with the above metal.

  The photocatalyst that can constitute the present invention is a metal oxide that can exhibit a photocatalytic function known in the art, such as anatase titanium dioxide, tin oxide, zinc oxide, tungsten oxide, strontium titanate, and iron oxide. As well as combinations thereof. Anatase-type titanium dioxide is preferably used because it exhibits an excellent function as a photocatalyst and is highly versatile.

  In the present specification, “anatase-type titanium dioxide” or “anatase-type titanium oxide” is a general term for titanium dioxide having a photocatalytic function, and in addition to titanium dioxide having anatase type, rutile-type titanium dioxide. Is not excluded, and includes the case where the rutile type is contained in a trace amount as long as the main component is anatase type titanium dioxide.

In the present invention, anatase-type titanium dioxide is a photocatalyst obtained by sputtering a metal titanium target using, for example, a sputtering apparatus in an inert gas (for example, Ar) and O ₂ gas atmosphere.

  In the photocatalyst carrier of the present invention, the amount of the photocatalyst supported is preferably 0.05% by mass to 50% by mass, more preferably 5% by mass to 20% by mass with respect to the total mass. When the supported amount of the photocatalyst is less than 0.05% by mass, the support itself cannot exhibit a sufficient photocatalytic function, and provides a satisfactory adsorptive decomposition performance for the photocatalyst filter material and, consequently, the contaminant. You may not be able to. If the amount of the photocatalyst supported exceeds 50% by mass, the production cost increases, but the photocatalytic function of the support itself is not improved further, and the inherent flexibility of the porous body may be impaired. is there.

  Furthermore, the thickness of the supported photocatalyst in the photocatalyst carrier of the present invention is, for example, 10 nm to 500 nm. It is preferable that the photocatalyst be supported evenly dispersed throughout the entire support or in a portion that is easily affected by light exposure as a support (or filter) in order to fully exhibit the functions of the photocatalyst.

  In the present invention, the photocatalyst is supported on the flexible porous body (coated porous body) coated with the metal by sputtering, vacuum deposition, thermal spraying, sol-gel method, spray coating method, or dip coating method. Any method used for supporting a conventional photocatalyst such as can be adopted. In the present invention, it is preferable to use a sputtering method because the metal coating and the photocatalyst support can be completed in the same process.

In the present invention, in the sputtering of the photocatalyst on the coated porous body, examples of the gas species include a combination of O ₂ and Ar, Xe, or Kr. Although the application pressure is not necessarily limited, for example, 1 × 10 ¹ to 1 × 10 ⁻⁴ Pa can be preferably set under a low vacuum. When oxygen is used, the partial pressure is preferably set to 1 × 10 ¹ to 1 × 10 ⁻⁴ Pa.

  The photocatalyst carrier of the present invention can be used as it is in a water purification device, an air purification device or the like as a photocatalytic filter for decomposing or adsorbing contaminants. Since the photocatalyst carrier of the present invention retains the inherent flexibility of the porous body to be used, the carrier itself is also flexible, and the size and shape of the container to be accommodated and the mounting location It is also possible to deform in accordance with. Furthermore, since the photocatalyst is supported on the flexible porous body through the coated metal film, the possibility that the support itself decomposes and collapses due to the function of the photocatalyst can be eliminated. As a result, the photocatalyst carrier of the present invention can exhibit a stable photocatalytic function over a long period of time.

  EXAMPLES Hereinafter, although an Example demonstrates this invention more concretely, this invention is not limited by these Examples.

Example 1
A plurality of 100 mm × 100 × 20 mm (height) polyurethane sponge structures (bulk density 0.025 g / cm ³ , mass 5 g, specific gravity 1.2, porosity 97%, skeleton thickness average 0.8 mm, Sputtering of titanium metal at 8.0 × 10 ⁻¹ Pa in an argon atmosphere with a DC / RF magnetron sputtering apparatus (model number: 14-134PF / manufactured by UTEC Co., Ltd.) on a pore size average of 1.2 mm, mesh # 13) Went to each. A coated porous body having a metal titanium loading of 5% by mass and an average thickness of 20 nm with respect to the total mass was obtained.

Subsequently, 8.0 × 10 ⁻¹ Pa (oxygen partial pressure: 4. 5) was applied to the coated porous body in a DC / RF magnetron sputtering apparatus (model number: 14-134PF / manufactured by UTEC Co., Ltd.) in an oxygen and argon atmosphere. Sputtering of metal titanium was carried out at 0 × 10 ⁻¹ Pa) to support anatase type titanium dioxide. A support sample E1 having an anatase photocatalyst loading of 10% by mass and an average thickness of 50 nm with respect to the total mass was obtained.

  One of the obtained samples E1 was compressed and deformed by pressing with a finger. Thereafter, when the pressing was stopped, the sample E1 was restored to its original state, and it was confirmed that the support was not broken and the titanium dioxide did not fall off. Further, the compression fracture displacement (%) was measured by compressing with a tensile compression tester. The obtained results are shown in Table 1.

Next, the acetaldehyde removal rate (%) and CO ₂ conversion rate (%) were measured according to JIS R 1701-2 for the other one of the sample E1 obtained above. The obtained results are shown in Table 1.

Furthermore, pressure loss was evaluated according to JIS B 9908 format 1 about the other one of the samples E1 obtained above. The pressure loss of the sample obtained in this example was 0.02 Pa at, for example, 0.05 m ³ / min (5 L / min). The results are shown in Table 2 together with the results of pressure loss at different air volumes.

  In Table 2, the pressure loss (310−290 = 20 (200−290 (20)) calculated from the description of paragraph numbers 0041 and 0042 of Japanese Patent Laid-Open No. 2004-160452 (Patent Document 7) using glass fibers instead of the porous body. Pa)) Results are listed for comparison.

  For another one of the samples E1 obtained above, an ultrasonic cleaner (28 kHz, 45 kHz, 100 kHz (output 150 W to 600 W), model number: VS-100III, manufactured by Velvo Crea Co., Ltd.) is used. Then, ultrasonic vibration was applied for 30 minutes. However, it was confirmed that the photocatalyst was not peeled off from the sample E1 by ultrasonic vibration.

(Comparative Example 1)
The mixing ratio of the phenol resin and the silicon powder is set to a ratio of 5: 3 of carbon and silicon by carbonization of the phenol resin, and the slurry is prepared by dissolving the phenol resin with ethyl alcohol. In order to reduce the particle size, they were mixed with a ball mill for 1 day. A plurality of 100 mm × 100 × 20 mm (height) polyurethane sponge structures (bulk density 0.025 g / cm ³ , mass 5 g, specific gravity 1.2, porosity 97%, skeleton thickness average) It was impregnated with 0.7 mm, average pore diameter of 1.2 mm, and mesh # 13).

  Next, the sponge was carbonized by firing at 1000 ° C. for 1 hour in an argon atmosphere. The obtained carbonaceous porous body was simultaneously subjected to reactive sintering and silicon melt impregnation in vacuum at 1450 ° C. for 1 hour.

The porous body was heated and oxidized in the atmosphere at 1000 ° C. for 1 hour to form an SiO ₂ layer on the surface of the porous body. A SiC oxide diffusion layer was formed at the boundary between the porous body and the SiO ₂ layer, and the SiO ₂ layer was stronger than the natural oxide film.

The porous body oxidized as described above is dip-coated with TiO ₂ slurry on the SiO ₂ layer, dried, and then heat-treated in the atmosphere at 1000 ° C. for 1 hour to form the SiO ₂ layer on the SiO ₂ layer. A solid solution layer in which SiO ₂ and TiO ₂ diffuse was formed. As the TiO ₂ slurry, a commercially available TiO ₂ sol having a TiO ₂ concentration of 10% (“TKC-303” manufactured by Teika Co., Ltd.) diluted to a TiO ₂ concentration of 2% was used.

Further, the obtained porous body is a titanium dioxide slurry (a water slurry in which titanium dioxide powder containing a rutile type having a primary particle diameter of 21 nm and a specific surface area of 50 m ² / g and containing anatase type as a main component is dispersed in pure water. , Which is obtained by adding 30 g of titanium dioxide powder to 270 g of pure water and stirring for 16 hours by a ball mill), drying, and then heat-treating at 600 ° C. for 1 hour. Sample C1 was obtained.

  One of the obtained samples C1 was compressed and deformed in the same manner as in Example 1. Sample C1 collapsed with a slight displacement, and collapse of the supported titanium dioxide was also observed. Further, the compression fracture displacement (%) was measured in the same manner as in Example 1. The obtained results are shown in Table 1.

Next, the acetaldehyde removal rate (%) and the CO ₂ conversion rate (%) were measured in the same manner as in Example 1 for the other one of the sample C1 obtained above. The obtained results are shown in Table 1.

(Comparative Example 2)
A plurality of 100 mm × 100 × 20 mm (height) ceramic porous bodies (Co., Ltd.) mainly composed of a mixture of cordierite (2MgO · 2Al ₂ O ₃ · 5SiO ₂ ) and alumina (Al ₂ O ₃ ) Bridgestone, bulk density 0.4g / cm ³ , mass 80g, specific gravity 2.8, porosity 86%, skeleton thickness average 1.2mm, pore diameter average 3.2mm, mesh # 6) It was preheated and fired at 550 ° C. for 1 hour in an electric furnace, cooled under standing, and then placed in a crucible. This was immersed on the entire surface for about 5 minutes in a treatment solution containing 1.70% by weight of anatase-type titanium dioxide fine particles (average particle size 27 nm), 0.26% by weight of peroxotitanic acid, and 98.05% by weight of water. Dried in a hot air circulating oven. After drying, the entire surface was immersed for 5 minutes and the drying was further repeated twice, followed by firing in an electric furnace at 400 ° C. for 1 hour. Then, after the temperature in an electric furnace fell to normal temperature, the porous body was taken out. In this way, a carrier sample C2 was obtained.

  One of the obtained samples C2 was compressed and deformed in the same manner as in Example 1. Sample C2 collapsed with a slight displacement, and collapse of the supported titanium dioxide was also observed. Further, the compression fracture displacement (%) was measured in the same manner as in Example 1. The obtained results are shown in Table 1.

Next, in the same manner as in Example 1, the acetaldehyde removal rate (%) and the CO ₂ conversion rate (%) were measured for the other one of the sample C2 obtained above. The obtained results are shown in Table 1.

(Comparative Example 3)
A plurality of porous layers of 100 mm × 100 × 20 mm (height) composed of a silicon carbide-alumina ceramic composite (in which an alumina film of 50 μm to 150 μm is formed on a silicon carbide ceramic porous body) Body (made by Moriwa Kogyo Co., Ltd., bulk density 0.51 g / cm ³ , mass 102 g, specific gravity 3.2, porosity 84%, skeleton thickness average 1.5 mm, pore diameter average 3.9 mm, mesh # 6 ) Is coated with a metal alkoxide / titanium dioxide coating solution (TiO ₂ 5%, metal alkoxide 1.25%), dried at around 100 ° C. for 1 hour, and then fired at 450 ° C. for 1 hour in a firing furnace. Sample C3 was obtained.

  One of the obtained samples C3 was compressed and deformed in the same manner as in Example 1. Sample C3 collapsed with a slight displacement, and collapse of the supported titanium dioxide was also observed. Further, the compression fracture displacement (%) was measured in the same manner as in Example 1. The obtained results are shown in Table 1.

Next, in the same manner as in Example 1, the acetaldehyde removal rate (%) and the CO ₂ conversion rate (%) were measured for the other one of the sample C3 obtained above. The obtained results are shown in Table 1.

(Comparative Example 4)
The support sample C4 was the same as in Example 1 except that the polyurethane sponge structure similar to that in Example 1 was not sputtered with metal titanium but was supported as it was with anatase-type titanium dioxide. Got.

  One of the obtained samples C4 was irradiated with a UV lamp (20W; (model number) FL20S · BL-B; manufactured by Panasonic Corporation). The progress of the surface state of the carrier C4 from the start of irradiation was observed every other month. As the lamp was continuously irradiated, it was confirmed that the sponge gradually collapsed and the photocatalyst dropped from the carrier C4.

As shown in Table 1, the carrier sample E1 obtained in Example 1 is a carrier sample produced in Comparative Examples 1 to 3 for all of the pressure fracture deformation, acetaldehyde removal rate, and CO ₂ conversion rate. It turns out that it is superior to C1-C3. Further, as shown in Table 2, the carrier sample E1 obtained in Example 1 has a pressure loss (Pa) higher than that described in Japanese Patent Application Laid-Open No. 2004-160452 using glass fibers as a substrate to be supported. ) Is extremely small, and it can be seen that the filter material is more suitable.

  According to the present invention, it is possible to efficiently produce a photocatalytic filter material excellent in purification performance such as decomposition and adsorption of contaminants. The photocatalyst carrier of the present invention is useful as a filter for, for example, a water purification device and an air purification device.

Claims (11)

  A photocatalyst carrier in which a photocatalyst is supported on a flexible porous body coated with a metal.   The photocatalyst carrier according to claim 1, wherein the photocatalyst is at least one metal oxide selected from the group consisting of titanium dioxide, tin oxide, zinc oxide, tungsten oxide, strontium titanate, and iron oxide.   The photocatalyst carrier according to claim 1 or 2, wherein the photocatalyst has a loading of 0.05% by mass to 50% by mass with respect to the total mass.   4. The metal according to claim 1, wherein the metal is at least one metal selected from the group consisting of titanium, copper, silver, gold, platinum, nickel, tin, zinc, tungsten, ruthenium, and strontium. The photocatalyst carrier as described.   The photocatalyst carrier according to any one of claims 1 to 4, wherein the flexible porous body has a sponge-like structure. A method for producing a photocatalyst carrier,
Coating a flexible porous body with a metal to obtain a coated porous body; and applying a photocatalyst to the coated porous body;
Including the method.   The method according to claim 6, wherein the application of the photocatalyst is performed by a sputtering method, a vacuum deposition method, a thermal spraying method, a sol-gel method, a spray coating method, or a dip coating method.   The method according to claim 6 or 7, wherein the photocatalyst is at least one metal oxide selected from the group consisting of titanium dioxide, tin oxide, zinc oxide, tungsten oxide, strontium titanate, and iron oxide.   The method according to any one of claims 6 to 8, wherein the photocatalyst has a loading of 0.05% by mass to 50% by mass with respect to the total mass.   The metal according to any one of claims 6 to 9, wherein the metal is at least one metal selected from the group consisting of titanium, copper, silver, gold, platinum, nickel, tin, zinc, tungsten, ruthenium, and strontium. The method described.   The method according to claim 6, wherein the flexible porous body has a sponge-like structure.

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