JPH09225321A - Photocatalyst - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a photocatalyst which can utilize the good catalytic capacity of anatase-type titanium oxide without deteriorating a base material constituent when mixed into the constituent by coating the anatase-type titanium oxide with a porous substance. SOLUTION: In this photocatalyst which is used for the decomposition and removal of environmental pollutants in water and air, deodorization, sterilization, etc., anatase-type titanium oxide is coated with a porous substance, the direct contact between a photo-semiconducting substance and a base material constituent is prevented by the coating layer, and simultaneously a state in which the photo-semiconducting substance is not cut off from light is materialized. As a form to coat the titanium oxide with the porous substance, for example, a porous microcapsule containing titanium oxide etc., are named. Preferably, a conductive substance which is brought into contact with the anatase-type titanium oxide is made to exist, and a polyolefin, polyurethane, etc., are made to be a matrix component.

Description

Detailed Description of the Invention

[0001]

[0001] The present invention relates to a photocatalyst.

[0002]

2. Description of the Related Art In recent years, the photocatalytic action of light from semiconducting materials is not limited to catalysis of chemical reactions such as photolysis of water.
It has attracted attention in many fields such as decomposition and removal of environmental pollutants in water and air, deodorization, and bactericidal action. In particular, regarding the bactericidal action, a new antibacterial method mainly utilizing the photocatalytic action of titanium oxide has been proposed (JP-A-5-154473). While the conventional antibacterial method using antibacterial agents has many problems such as durability of antibacterial performance, deterioration of weather resistance of base material due to addition of antibacterial agents, and safety problems due to outflow of chemicals, this method Is a method of performing sterilization by a catalytic action without using a chemical, and therefore has been attracting attention in terms of safety and durability.

On the other hand, since the photo-semiconductor is generally a fine powder, it is necessary to immobilize the powder when it is applied to the fields such as decomposition and removal of environmental pollutants, deodorization and sterilization. Therefore, attempts have been made to use the photo-semiconductor by supporting it on various base materials. The simplest method is to use a light semiconducting substance by dispersing it in a base material constituent such as an organic polymer, but there is a problem that the base material constituent deteriorates over a long period of time. Further, titanium oxide having an anatase type crystal structure is known to have a high photocatalytic performance, but it is expected that the material is largely deteriorated because of its high photocatalytic performance.

The above-mentioned deterioration is considered to be caused by radicals generated by a photocatalytic action, and there is a disclosure that when a fluororesin is used, the deterioration can be avoided (JP-A-4-28485).
However, in order to widen the range of material selection, improvement in the case of using other organic materials and the like is desired.

When a powder having a photocatalytic action such as titanium oxide is used as a pigment, a method of coating the surface of the powder with an inorganic compound such as silica or alumina in order to prevent the above-mentioned deterioration phenomenon of the material. Is used. If the surface of the photo-semiconductor is completely covered by this method, the deterioration can be prevented, but since the photo-semiconductor is shielded from the light, the photocatalytic action cannot be obtained.

[0006]

In view of the above problems, the present invention provides an excellent catalyst of titanium oxide having anatase type crystal structure without deteriorating the constituent components of the base material when mixed with the constituent components of the base material. The object is to provide a photocatalyst capable of utilizing the performance.

[0007]

The photocatalyst body of the present invention is characterized in that it comprises a porous material coated with titanium oxide having an anatase type crystal structure. The coating layer of the porous substance prevents direct contact between the light semiconducting substance and the constituent components of the substrate, and at the same time realizes a state in which the light semiconducting substance is not shielded from light.

<Titanium oxide having anatase type crystal structure> In the present invention, titanium oxide having anatase type crystal structure is used. Titanium oxide includes anatase type, rutile type,
It is known that there are three types of brookite-type crystal structures and those that are amorphous, but titanium oxide with anatase-type crystal structure has the highest photocatalytic activity, especially for the purpose of antibacterial and removal of nitrogen oxides. Excellent effect when used.

The anatase-type crystal structure titanium oxide used in the present invention does not have to be strictly composed of only anatase-type crystal structure. Titanium oxide mainly composed of anatase type crystal structure exhibits high catalytic activity sufficient to achieve the object of the present invention. Hereinafter, when simply referred to as “titanium oxide”, it means titanium oxide of anatase crystal structure type.

<Conductive Material> The titanium oxide improves the catalytic effect when used together with a conductive material. The conductive substance used may be carbon powder (fiber) or metal powder (fiber) generally used for imparting conductivity. Examples include carbon black, silver, copper, gold, iron, aluminum, nickel, platinum, palladium, tin oxide, indium oxide and the like. Alternatively, the surface may be coated with a non-conductive material as a core material. Examples thereof include silver-plated fine particles, aluminum-coated fine particles, and barium sulfate fine particles whose surface is coated with tin oxide.

Among the above conductive materials, tin oxide fine particles and barium sulfate fine particles whose surface is coated with tin oxide are preferable from the viewpoint of practical use, because they are easily available and are relatively inexpensive.
Tin oxide to which 0.1 to 20% by weight of antimony oxide is added exhibits high conductivity and is preferably used.

The above conductive material is used so as to be in contact with titanium oxide. For this purpose, it is possible to include it in a part of the structure of titanium oxide or to carry it on the surface of titanium oxide by a physical or chemical action, but it is simply a mixture of titanium oxide and a conductive substance. Sufficient effect can be obtained only by using powder.

The amount of the conductive material added to titanium oxide is 0.01 to 10 parts by weight based on 100 parts by weight of titanium oxide.
It is preferably 0 part by weight. If the amount is less than this, the effect of adding the conductive substance is difficult to recognize. If the amount is larger than this, the effect is not further enhanced, but in the case of also serving as a carrier of titanium oxide, the added amount may be large. In particular, when the mixture is simply used without using the method for contacting the conductive substance and titanium oxide, titanium oxide 1
It is preferably 1 to 100 parts by weight with respect to 00 parts by weight.

<Porous substance> As the porous substance for covering the titanium oxide, a material which does not easily deteriorate even when it is brought into direct contact with titanium oxide is selected. Materials that satisfy this condition include inorganic materials such as silica and alumina, Teflon resin, and silicon resin. As a method for making the above material porous, a method of firing titanium oxide after coating titanium oxide using an inorganic material mixed with an organic material, or dissolving the organic material only with a solvent, a water-soluble or oil-soluble salt, etc. is mixed. Then, a method of dissolving this later may be mentioned.

<Form of coating> As a form of coating titanium oxide with the above-mentioned porous material, for example, porous microcapsules encapsulating titanium oxide (FIG. 1), titanium oxide between layers of porous material A so-called sandwich structure (Fig. 2) sandwiched between them can be mentioned.

In the present invention, it is not necessary for the porous material to cover the entire surface of titanium oxide. 3 and 4 are examples in which only the light receiving surface (upper part of the drawing) is coated with a porous material and the opposite surface is not made porous. However, the surface not made porous is silica, alumina, Teflon resin,
A material such as silicon resin that does not cause deterioration is used.

<Microcapsule Photocatalyst> Considering the convenience of use, the form of porous microcapsules encapsulating titanium oxide seems to be most advantageous.

The above-mentioned porous microcapsules can be manufactured by a known microcapsule forming method. It is also possible to control the particle size and porosity of the powder by the method described in Japanese Patent Publication No. 54-6251. The porosity of the porous microcapsules encapsulating titanium oxide of the present invention is not particularly limited, but if titanium oxide is completely covered, the catalytic action will decrease.

As an example of the method for producing the encapsulated microcapsules, an oil-in-water type (O / W type) or a water-in-oil type (W /
The method of preparing an (O type) emulsion is mentioned. In addition, you can. Further, as a method for completely encapsulating titanium oxide, there can be mentioned a method for preparing a so-called (O / W) / O type or (W / O) / W type multiphase emulsion. In this case, a known microcapsule forming method and a known method for preparing a multiphase emulsion may be combined. In particular, in view of the purpose of preventing the deterioration of the organic resin and the like, it is preferable that titanium oxide is completely encapsulated so that titanium oxide is not present on the surface of the porous coating layer as much as possible.

The material forming the wall of the microcapsules encapsulating titanium oxide is the material exemplified as the above-mentioned porous substance after the effect or drying, and can be dissolved or dispersed in the solvent used for preparing the emulsion. Choose the right one. More specifically, an emulsion is prepared using water glass and aluminum chloride, and after curing, microcapsules having silica and alumina walls can be obtained.

If the amount of titanium oxide contained in the microcapsules is too large, the titanium oxide cannot be completely encapsulated and floats outside the microcapsules. If the amount is too small, the catalytic effect is not exhibited. An appropriate amount is 5-10 with respect to 100 parts by weight of the wall material constituents.
0 parts by weight.

The ratio of the porous material to titanium oxide other than the case of the microcapsule form is also determined in consideration of the coatable amount and the amount required for the catalytic effect.

<Method of Utilizing Photocatalyst> As a method of utilizing the photocatalyst of the present invention, a microcapsule-like photocatalyst is directly added to a material constituting a target product to which catalytic performance is desired to be molded, and a coating composition. A method of adding to a product and applying it to a target, a photocatalyst in the form of a film or a sheet (Fig.
4 etc.) on the surface of the object. The appropriate amount of use varies depending on the form of use, but when, for example, a synthetic resin is added to the target product as a binder, the processability of the resin composition, moldability, strength of the molded body or coating film, transparency, etc. Decide in consideration.

When the above-mentioned porous microcapsule-shaped photocatalyst is added to a general-purpose synthetic resin to be used as a molded body or a paint, if the addition amount of titanium oxide is too small, the photocatalytic action is insufficient. Considering the content of titanium oxide, it is preferable to add the titanium oxide in an amount of 5 parts by weight or more with respect to 100 parts by weight of the synthetic resin which is the main component of the molded product or the paint. On the other hand, if the amount of the porous microcapsules added is too large, the surface condition of the molded body or the coated surface will deteriorate and the strength will decrease, although it depends on the particle size of the microcapsules. It is preferable that the microcapsules be added in an amount of 1000 parts by weight or less.

Further, when a molded product is obtained by kneading or dry blending in a synthetic resin, the addition amount of the microcapsules to 100 parts by weight of the synthetic resin is 100 parts by weight from the viewpoint of strength of the molded product and workability. It is preferable not to exceed a part.

By using the photocatalyst of the present invention, it is possible to avoid deterioration due to contact between titanium oxide and the base component and to select the base component without being limited by the deterioration.
It is advantageous in various usage forms. When titanium oxide is added to a general-purpose resin and used as a molded product, a paint, or the like, the above-mentioned deterioration cannot be avoided by the conventional techniques, which is a major obstacle to practical use. The higher the photocatalytic performance, the more the deterioration becomes a problem. Therefore, the advantage of not being restricted by the constituent components of the base material of the present invention has an extremely great industrial significance.

As described above, the photocatalyst of the present invention has a great advantage when used in combination with an organic resin. Most of the commonly used synthetic resins are materials that cannot support titanium oxide, because deterioration is a problem unless the photocatalyst body of the present invention is used. Specific examples of such materials include polyolefin resins such as polyethylene resin and polypropylene resin; polyurethane resin; polyester resins such as alkyd resin and unsaturated polyester;
Poly (meth) acrylic resin; polyamide resin; polystyrene resin, polyvinyl chloride resin, polyvinyl acetate resin,
Examples thereof include vinyl compound (co) polymers such as polyvinyl alcohol resin; formaldehyde resins such as phenol resins and amino resins (referred to as a formaldehyde-crosslinking type resin); allyl resins; epoxy resins.

<Field of Use of Photocatalyst> Titanium oxide is presumed to react with water present in the air to produce active oxygen such as hydrogen peroxide and hydroxy radicals. By using it, antibacterial and antifungal treatments on the interior and exterior of buildings, sterilization treatments such as nosocomial infection prevention, decomposition and removal treatment of environmental pollutants such as nitrogen oxides, sulfur oxides and trihalomethanes, odors such as ammonia, aldehydes and various organic acids It is possible to perform decomposition and removal treatment of the causative substance, antifouling treatment for imparting a self-cleaning action to the exterior material, waste liquid treatment utilizing a catalytic action, and the like.

Among the above-mentioned treatments, the photocatalyst of the present invention is particularly suitable for antibacterial and antifungal treatment, and treatment for removing gaseous components such as environmental pollutants and malodorous substances. In the antibacterial and antifungal treatment, unlike the conventional techniques involving the elution of chemicals and the like, the durability and safety are excellent. In the gas component removal treatment, in addition to the catalytic action of titanium oxide, the porous substance enhances the adsorption effect of the gas to be treated. Since the gas treatment with titanium oxide of the present invention utilizes a photocatalytic action, the gas adsorption effect is large as compared with the prior art which only utilizes the adsorption of the porous material, and its sustainability is long. Very good. Furthermore, as compared with the state in which titanium oxide is exposed, it is possible to suppress the activity decrease due to non-poisoning of the catalyst surface.

Since the photocatalyst of the present invention is formed by coating titanium oxide having an anatase type crystal structure with a porous substance, the amount of titanium oxide exposed outside the coating layer made of the porous substance is the amount of inclusion. Since most of short-lived components such as hydroxy radicals generated when the photocatalyst is irradiated with light disappears while passing through the coating layer, the photocatalyst is out of the photocatalyst since It is presumed that long-lived components such as hydrogen peroxide permeate outside the photocatalyst and act without leaking to the photocatalyst.

[0031]

The present invention will be described in more detail with reference to the following examples.

Example 1 4 g of titanium oxide (manufactured by Wako Pure Chemical Industries, anatase type, primary particle size 0.3 μm) was added to 50 ml of an aqueous sodium silicate solution (4 mol / l of silicon dioxide) and stirred for 10 minutes. A homogeneous suspension was prepared. 150 ml of the above suspension containing sorbitan monooleate in benzene (1% by weight)
The resulting mixture was shaken with a shaker for 5 minutes to prepare a W / O type emulsion. Next, the above emulsion oil was added to 500 ml of an ammonium sulfate aqueous solution (1 mol / l) with stirring and reacted for 30 minutes. After completion of the reaction, filtration, washing with water,
Each operation of drying (110 ° C., 24 hours) was performed to obtain a microcapsule-shaped photocatalyst body containing titanium oxide and having a wall made of porous silica and having an average particle diameter of 7 μm.

Example 2 Instead of 4 g of titanium oxide used in Example 1, titanium oxide (manufactured by Wako Pure Chemical Industries, anatase type, primary particle size 0.3 μm) was used.
m) 9 parts by weight and 1 part by weight of antimony oxide-containing tin oxide (“T-1” manufactured by Mitsubishi Materials, particle size 0.02 μm) were mixed (hereinafter, “titanium oxide / tin oxide mixed powder”).
That. ) In the same manner as in Example 1 except that 4 g was used, a microcapsule-shaped photocatalyst body containing titanium oxide and having a wall made of porous silica and having an average particle size of 5 μm was obtained.

Example 3 Titanium oxide (manufactured by Ishihara Sangyo Co., anatase type, primary particle size 7
nm) 9 parts by weight and 1 part by weight of antimony oxide-containing tin oxide (“T-1” manufactured by Mitsubishi Materials Corporation, particle size 0.02 μm) (hereinafter referred to as “titanium oxide / tin oxide mixed powder”). Silicone oil for powder treatment (made by Shin-Etsu Chemical Co., Ltd.)
AFP-1) was added to the powder in an amount of 2% by weight to perform a lipophilic treatment. 6 g of powder obtained by drying and crushing this was suspended in 10 ml of toluene to obtain a suspension. Next, the above suspension was treated with a 1 wt% polyoxyethylene sorbitan monooleate water glass aqueous solution (2 mol / l as silicon dioxide).
After adding to 70 ml, the mixture was dispersed for 1 minute with a homogenizer to prepare an O / W type emulsion. Then, the obtained emulsion was added to a sorbitan monostearate solution in toluene (2
(Wt%) was added to 150 ml and shaken for 5 minutes with a shaker to prepare an (O / W) / O type emulsion. Next, the above emulsion was treated with an aqueous solution of calcium chloride (2 mol / l) 5
The mixture was added to 00 ml with stirring and reacted for 30 minutes. After completion of the reaction, filtration, washing with water, and drying at 110 ° C. for 24 hours were carried out to obtain a microcapsule-shaped photocatalyst body containing titanium oxide and having a wall made of porous silica and having an average particle diameter of 2 μm.

Example 4 A mixture of 15.2 g (0.1 mol) of tetramethoxysilane and 7.3 g (0.1 mol) of dimethylformamide was added to an aqueous ammonia solution (2 × 10 ⁻³ mol / l).
A mixed solution of 18 g and methanol 7 g (0.22 mol) was added dropwise at room temperature, 6 g of titanium oxide / tin oxide mixed powder was further added and mixed, and gelation was performed in a dryer at 35 ° C. for 8 hours. . After further heating to 150 ° C. and drying for one day, the gel body obtained was pulverized to prepare a photocatalyst body containing titanium oxide in porous silica.

Comparative Example 1 Instead of the microcapsule-shaped photocatalyst of Example 1, titanium oxide (manufactured by Wako Pure Chemical Industries, anatase type, primary particle size 0.3) was used.
μm) The powder was used as is.

Comparative Example 2 Instead of the microcapsule-shaped photocatalyst of Example, titanium oxide (manufactured by Wako Pure Chemical Industries, rutile type, primary particle size 0.3 μm) was used.
m) The powder was used as is.

Comparative Example 3 4 g of the titanium oxide / tin oxide mixed powder was suspended in 36 g of water to prepare a slurry, and then an aqueous solution in which 0.1 g of aluminum chloride was dissolved was added. While gently stirring this mixed solution, an aqueous solution of sodium hydroxide was slowly added dropwise for neutralization to deposit aluminum hydroxide on the surface of the mixed powder in the slurry. Then, the precipitate is filtered and dried,
The powder was pulverized to obtain a powder whose surface was coated with alumina.

Comparative Example 4 4 g of titanium oxide (manufactured by Wako Pure Chemical Industries, rutile type, primary particle size 0.3 μm) instead of titanium oxide (anatase type)
In the same manner as in Example 2 except that the above was used, a microcapsule-like powder having a mean particle diameter of 6 μm and having a wall made of porous silica and encapsulating rutile-type titanium oxide was obtained.

Comparative Example 5 Oxidation was performed in the same manner as in Example 2 except that 4 g of iron oxide (Wako Pure Chemical Industries, Ltd., primary particle size: 0.6 μm) was used in place of titanium oxide (anatase type). Microcapsule-like powder having an average particle diameter of 11 μm, which contained iron and had a wall made of porous silica, was obtained.

<Molded Article> The photocatalysts obtained in the above Examples and the powders obtained in Comparative Examples were blended with unsaturated polyester (Mitsui Toatsu Chemical Co., Ltd., “V-262G”) in the amounts shown in Table 1. Then
Dispersion was performed for 2 hours using a disperser. In addition to this, methyl ethyl ketone peroxide 5 was added as a thermal polymerization initiator.
4 parts by weight of a 5% by weight dimethyl phthalate solution and 2 parts by weight of cobalt naphthenate (metal content: 6% by weight) as a curing accelerator were added and mixed. Approximately 200μ in a FRP mold for trial production of a flat plate sample in which this composition was previously treated with a release agent.
It was applied so as to have a thickness of m, and once cured at 80 ° C. for 15 minutes. After cooling, a resin solution prepared by adding 55% by weight MEKP dimethyl phthalate solution to an unsaturated polyester resin similar to the above on the obtained coating was mixed and poured into the mold, and after curing, the mold was released from the FRP mold. A molded product having a polyester resin layer containing the photocatalyst or the powder of the comparative example was obtained.

The following methods were used to evaluate the antibacterial properties, antifungal properties, and weather resistance of the above molded products, and the gas decomposability of the powders of Example 2 and Comparative Examples 1 and 3.
The results are shown in Table 1.

[0043]

[Table 1]

<Evaluation of antibacterial property> The molded bodies produced in Examples and Comparative Examples were placed in a sterile petri dish, and a test bacterial solution (Heart Infusion Broth medium (hereinafter referred to as BHI medium, manufactured by DIFCO, 25 g / l) was placed thereon. ) Was diluted 100 times with physiological saline, and 1 ×
10 7 CFU / ml) was dispensed and the lid was closed. Seal the petri dish and turn on the fluorescent lamp for 3
After culturing at 0 ° C. for 1 day, the viable cell count of the test bacterium after culturing was measured by an ordinary colony counting method.

<Evaluation of antifungal properties> Molds and yeasts previously cultivated on potato dextrose agar medium (hereinafter referred to as PDA medium, manufactured by Nissui Pharmaceutical Co., Ltd.) were scraped off with a platinum loop, and 0.05% Tween 80-added physiology was added. The mixture was placed in saline, dispersed and stirred, and then filtered using a glass filter. The obtained filtrate was centrifuged at 10,000 rpm for 15 minutes to remove the supernatant liquid to obtain a precipitate (spores). In addition to this, potato dextrose liquid medium (hereinafter PDB
A spore suspension was prepared by adding an appropriate amount of medium, manufactured by DIFCO.

After sterilizing the PDA medium by autoclave, it was incubated at 45 ° C. so that the agar did not solidify, and 1/10 volume of the above spore suspension was added to this and stirred. The molded bodies produced in Examples and Comparative Examples were placed in a sterilized petri dish, and 50 μl of the spore suspension-containing PDA medium was added dropwise to each to solidify into a hemisphere. After the petri dish was sealed and cultured at 30 ° C. for 3 to 5 days under lighting of a fluorescent lamp, the growth of the bacteria was visually determined. ○ Growth of test bacterium is not observed × Growth of test bacterium is recognized

<Evaluation of weather resistance> A weather resistance accelerated test was carried out using a test device using a sunshine carbon arc lamp specified in JIS-A1415, and the color difference of the plate after irradiation for 200 hours was measured by a color difference meter (Tokyo Denshoku Co., Ltd.). (Manufactured by Color Analyzer TC-1800MK), and the absolute value of the color difference changed from before the test is shown. Further, the surface of the plate after the test was lightly rubbed with a finger to observe the presence or absence of chalking. ○ No chalking allowed × Choking allowed

<Evaluation of Gas Decomposability> A microcapsule-shaped photocatalyst of Example 2 and powders of Comparative Examples 1 and 2 suspended in water to form a slurry were used as a cylindrical glass column having a roughened inner surface. (Inner diameter: 3 cm, length 30 cm) was applied and dried to obtain a glass column having an inner surface carrying a photo-semiconductive powder. Four plaque light blue fluorescent lamps (10 W) were installed at a distance of 5 cm around this column tube, and the concentration was 10 p
A test gas of pm was passed through the column at a speed of 50 ml / min, and the concentration of the test gas after passing through the column was measured. Two types of test gas were used: nitrogen dioxide and acetaldehyde, which is a malodorous component.

The reduction rate of the test gas was calculated by the following formula. Reduction rate (%) of test gas = [1- (test gas concentration after passage / test gas concentration before passage)] × 100 (%) The results are shown in Table 1. From this result, it was confirmed that the photocatalyst body coated with the porous material is excellent in the removal performance of these gases as compared with the case where the photosemiconductor material is used as it is.

[0050]

Since the photocatalyst of the present invention comprises titanium oxide having an anatase type crystal structure coated with a porous material, the amount of titanium oxide not exposed or exposed on the surface of the photocatalyst is the inclusion amount. It is in a very small amount in comparison, and most of short-lived components such as hydroxy radicals generated by irradiation of light on the photocatalyst are lost when passing through the coating layer made of a porous substance, and are left outside the photocatalyst. It is presumed that the long-lived component such as hydrogen peroxide does not leak and permeates out of the photocatalyst to act.

Therefore, it is possible to impart the antibacterial property to the article while preventing the deterioration of the constituent components of the base material which is considered to be caused by the above-mentioned single life component. In addition, the catalytic effect is improved by including a small amount of the conductive substance together with the photo-semiconductive substance.

According to the present invention, the components constituting the base material to which the photocatalytic action is imparted can be selected without being restricted by deterioration, so that antibacterial and antifungal treatment, sterilization treatment, and environmental pollutants can be performed. , Decomposition and removal of substances that cause offensive odors,
It is advantageous when used in any field such as photolysis of water and catalyst.

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[Procedure amendment]

[Submission date] June 24, 1996

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0005

[Correction method] Change

[Correction contents]

When a powder having a photocatalytic action such as titanium oxide is used as a pigment, a method of coating the surface of the powder with an inorganic compound such as silica or alumina in order to prevent the above-mentioned deterioration phenomenon of the material. Is used. If the surface of the photoconductive material is completely covered by this method, the deterioration can be prevented, but the catalytic action by light cannot be obtained.

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0007

[Correction method] Change

[Correction contents]

[0007]

The photocatalyst body of the present invention is characterized in that it comprises a porous material coated with titanium oxide having an anatase type crystal structure. The coating layer of the porous material, the semi-conducting material and the substrate component is to be you prevent direct contact.

[Procedure 3]

[Document name to be amended] Statement

[Correction target item name] 0043

[Correction method] Change

[Correction contents]

[0043]

[Table 1]

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] Brief description of drawings

[Correction method] Added

[Correction contents]

[Brief description of drawings]

FIG. 1 is a schematic diagram of a porous microcapsule of the present invention.

FIG. 2 is a schematic diagram showing a first example of a porous laminate of the present invention.

FIG. 3 is a schematic diagram showing a second example of the porous laminate of the present invention.

FIG. 4 is a schematic diagram showing a third example of the porous laminate of the present invention.

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Claims (6)

[Claims] 1. A photocatalyst body obtained by coating titanium oxide having an anatase type crystal structure with a porous material. 2. A porous microcapsule photocatalyst body containing titanium oxide having an anatase type crystal structure and having a wall made of a porous material. 3. The photocatalyst body according to claim 1, wherein a conductive substance is present in contact with titanium oxide having an anatase type crystal structure. 4. A polyolefin resin, a polyurethane resin, a polyester resin, a poly (meth) acrylic resin, a polyamide resin, a vinyl compound (co) polymer, and formaldehyde containing the photocatalyst according to any one of claims 1 to 3. A resin composition containing at least one selected from the group consisting of resins, allyl resins and epoxy resins as a matrix component. 5. An article having an antibacterial function, comprising the photocatalyst according to any one of claims 1 to 3 fixed with at least a part of the photocatalyst being exposed on the surface. 6. Nitrogen oxide removal, characterized in that the photocatalyst according to any one of claims 1 to 3 is contacted with a gas containing nitrogen oxides to decompose the nitrogen oxides. Method.