JP2002028412A - Photocatalytic filter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a novel photocatalytic filter having peculiar light receiving property in a corrugate honeycomb shaped photocatalytic filter excellent in air permeability. SOLUTION: In the corrugate honeycomb shaped filter containing a photocatalyst, the wave direction of the center containing the photocatalyst crosses the opening face of a cell. The wave directions of 2 adjacent centers preferably cross to each other. Further preferably the wave directions of 2 adjacent centers cross at a fixed and prescribed angle.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a corrugated honeycomb-shaped photocatalytic filter having excellent air permeability, and more particularly to a novel photocatalytic filter having a unique light receiving property.

[0002]

2. Description of the Related Art The components of malodor such as food odor, tobacco odor, pet odor, and toilet odor are various, and typical ones are ammonia, amines, nitrogen compounds such as indole and skatole, hydrogen sulfide, There are sulfur compounds such as methyl mercaptan, methyl sulfide, methyl disulfide and dimethyl disulfide, aldehydes such as formaldehyde and acetaldehyde, ketones such as acetone, and alcohols such as methanol and ethanol.

Heretofore, as a method of deodorizing such malodor, a method of chemically reacting a malodorous substance with a medicine, a method of masking a malodorous substance with an aromatic agent, and adsorption of a malodorous substance by an adsorbent such as activated carbon and zeolite have been proposed. There has been a method or a method of combining these methods. Although various such deodorizing methods have been used, it is almost impossible to regenerate both the drug and the fragrance after reacting with the malodorous substance. Also, in the case of an adsorbent, when the adsorption capacity is saturated, the deodorizing performance is significantly reduced. Therefore, any replacement must be periodically replaced with a new one.

Therefore, a technique has been developed in which a photocatalyst and a lamp are used to achieve a deodorizing function. A photocatalyst is a substance that converts light energy into chemical energy.In this deodorization technology, a photocatalyst is irradiated with ultraviolet rays from a lamp to activate the photocatalyst with the light energy, thereby promoting an oxidation reaction to convert odorous substances into odorless substances. Convert. When the photocatalyst is excited by the ultraviolet radiation, attacking the oxygen electrons from the photocatalyst is adsorbed on the surface popping with the O ₂ ^- generate, also,
The holes attack the moisture in the air to generate OH radicals, and these active species promote the oxidation reaction of malodorous substances, and various malodorous substances, specifically, odorless substances such as water vapor and carbon dioxide Since it is finally decomposed, deodorization using a photocatalyst is very excellent.

[0005] The photocatalyst used for such deodorization is disclosed in JP-A-1-189322 and Japanese Utility Model Laid-Open No. 1-189322.
As disclosed in Japanese Patent Application Laid-Open Publication No. H10-209, it is preferable that the honeycomb structure has a honeycomb shape, which has an effect of increasing a deodorizing speed. Honeycomb-shaped photocatalyst filters are often adopted even in commercially available photocatalyst type air purifiers, among others,
Corrugated honeycomb-shaped photocatalytic filters that are strong and suitable for mass production are widely used.

A honeycomb-shaped photocatalyst filter typified by a corrugated honeycomb-shaped photocatalyst filter is excellent in air permeability and has a large photocatalyst carrying area per air passage area or per unit volume. In particular, there is a problem that, of the light emitted from the lamp, part or most of the most intense light emitted to the vicinity of the photocatalytic filter leaks from the cell hole.

[0007]

An object of the present invention is to provide a corrugated honeycomb-shaped photocatalyst filter having excellent air permeability and a novel photocatalytic filter having a specific light receiving property.

[0008]

Means for Solving the Problems As a result of intensive studies to solve the above problems, the present inventors have completed the following invention.

(1) In a corrugated honeycomb filter containing a photocatalyst, the direction of the wave of the shins containing the photocatalyst intersects the opening surface of the cell.

(2) The photocatalyst filter according to the above invention (1), wherein the directions of the waves of two adjacent medals intersect.

(3) In the above invention (2), the angle at which the direction of the wave of the meddle crosses the opening surface of the cell is constant, and the angle is in the range of 15 ° to 60 °. Photocatalytic filter.

(4) In the above invention (1), the photocatalytic filter is characterized in that the directions of the waves of two adjacent medals do not cross.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION The photocatalyst filter of the present invention has a corrugated honeycomb shape having excellent air permeability, and is arranged such that the direction of the wave of the shins containing the photocatalyst intersects with the opening surface of the cell. In addition, it is intended to reduce leakage of excitation light, particularly strong excitation light emitted from a lamp to the vicinity of the photocatalytic filter, and to enhance photocatalytic performance.

The photocatalyst according to the present invention is 0.5 to 5e
V, preferably a photoreactive semiconductor that has a bandgap of 1 to 4 eV and provides a photocatalytic reaction, and exhibits functions such as antibacterial, antiviral, antifungal, deodorizing, and antifouling by irradiating with excitation light. It is a material to do. In particular, its antibacterial properties are excellent, it not only suppresses the growth of bacteria, but also decomposes toxins generated when bacteria die, detoxifying them, and also decomposes dead bacteria, so its effect is It is said that it does not deteriorate in a short period of time unlike conventional inorganic antibacterial agents and is permanent.

The photocatalyst according to the present invention includes metal oxide particles such as zinc oxide, tungsten oxide, titanium oxide and cerium oxide. Among them, titanium oxide is most suitable for use in living space because of its structural stability, ability to remove photoreactive harmful substances, and safety in handling, and zinc oxide is an environment that is not irradiated with excitation light. It also has antimicrobial properties even below, and both are advantageously used as the photocatalyst of the present invention.

The titanium oxide according to the present invention may be a general-purpose titanium dioxide used as a white pigment (provided that the weathering treatment has been completely or only partially performed), metatitanic acid, orthotitanic acid and hydrous titanium oxide. And titanium oxides and hydroxides such as hydrated titanium oxide, titanium hydroxide and titanium peroxide.

Among them, fine particle titanium oxide having a primary particle size of about several tens nm and having an anatase crystal structure is a relatively inexpensive and excellent photocatalyst. However, the titanium oxide according to the present invention is not limited to an anatase crystal structure, and may have a crystal structure such as rutile or brookite or an amorphous titanium oxide as long as it has a photocatalytic ability. .

Examples of the shape of the titanium oxide include a cubic shape, a spherical shape, a true spherical shape, a flake shape and a nanocluster.

In addition to the above titanium compounds, organic titanates such as titanium alkoxides and titanium chelates may be used, and a highly uniform and highly transparent photocatalytic film can be formed.

The titanium oxide used in the present invention may be prepared by a conventional method such as a sulfuric acid method or a chlorine method, or may be prepared by a method capable of achieving high functionality such as coping with visible light or a post-treatment such as magnetron. Sputter deposition method, high-frequency thermal plasma CVD method, thin film production method by pulse electrolysis,
It may be manufactured or processed by X-ray irradiation processing, low-temperature plasma processing, or the like.

Pt, Au, Ag, Cu, Pd, Ni, C
o, Fe, Zn, Mo, Ir, Bi, W, Os, Rh,
Compounds such as various metals such as Nb, Zr, Sn, V, Cr, and Ru, and compounds such as ions or oxides thereof may be supported or doped to form a composite.

As a method of compounding such a compound such as a metal, an ion thereof or an oxide thereof with a photocatalyst such as titanium oxide, a method of reacting oxygen or the like after evaporating and evaporating the raw material of the photocatalyst and the substance to be combined is used. A method of treating and solidifying in an atmosphere containing a predetermined substance, a method of implanting a metal ion beam of high energy using an accelerator, a method of intercalating by intercalation, and the like. However, the present invention is not limited to this.

The photocatalyst according to the present invention may be a microencapsulated photocatalyst coated with a porous substance such as silica or alumina-silica, and the photocatalyst is excellent in supportability without coming into direct contact with the substrate. Further, the porous substance which is a coating is preferable because it may function as an adsorbent.

The corrugated honeycomb according to the present invention is:
It is a structure composed of cell walls having openings formed by alternately stacking a flat liner and a corrugated midsole, or by stacking the midsole alone.

The photocatalyst filter of the present invention is characterized in that the direction of the wave of the midline intersects the opening surface of the cell. Such a corrugated honeycomb is, for example, JIS-Z-
A corrugated block is produced by laminating a plurality of single-sided corrugated cardboards, which are produced by laminating a liner and a midliner in accordance with the “exterior corrugated cardboard” described in No. 1516, while sequentially bonding the corrugated blocks. (See FIG. 1).

The direction of the wave of the midline according to the present invention is a direction corresponding to the traveling direction when the midline having a wave shape is regarded as a traveling wave (see FIG. 2).

The wave shape of the shin according to the present invention is generally a sine wave or a pseudo sine wave, but is not particularly limited, and is a sea wave, a triangular wave, a square wave, a wave formed by connecting semicircular or fan-shaped arcs. A waveform such as

In the photocatalytic filter of the present invention, the directions of the waves of two adjacent medals in the corrugated honeycomb may or may not intersect, and the directions of the waves of the medals as shown in FIG. The photocatalyst filter of the present invention, in which the crosses do not intersect, can adjust the wind direction by the excellent rectifying action of the corrugated honeycomb.

On the other hand, a corrugated honeycomb in which the directions of the waves of the shin are crossed is, for example, a flat plate (liner) and a corrugated plate (nakashin) disclosed in Japanese Patent Application Laid-Open No. 48-31541.
Are alternately stacked and two air flows in a straight line to form a corrugated block (see FIG. 3), which can be cut and manufactured.

The angle at which the directions of the waves of the shins intersect is not limited to a right angle, and the waves may be laminated at a desired angle. Also, the angle of intersection at each stage may be fixedly stacked, or may be randomly stacked.

In the photocatalyst filter of the present invention, in which the directions of the waves do not intersect, the ventilation direction of the cell is not constant, and the above-mentioned rectifying action can be reduced.

Although it is preferable that all the steps intersect, the middle pins which do not cross each other may be continuous.

In the photocatalytic filter of the present invention in which the directions of the waves of the shins intersect, it is preferable that all the directions of the waves of the shins intersect the opening surface of the cell, but within the range where the effects of the present invention are achieved. May include a ridge in which the direction of the waves does not intersect with the opening surface of the cell.

In the present invention, the angle at which the direction of the wave of the mesin intersects the opening surface of the cell is not particularly limited, but is preferably 15 ° to 60 °, and more preferably 30 ° to 4 °.
More preferably, it is 5 °. If the angle is less than 15 °, there arises a problem that the effect of blocking the excitation light is not sufficiently achieved. On the other hand, if it exceeds 60 °, there is a problem that it is difficult to obtain sufficient air permeability because the cell walls of the liner obstruct the flow of air.

In the photocatalyst filter of the present invention, the angle at which the direction of the wave of the middle shin intersects the opening surface of the cell in each stage is uniform within a certain narrow range so that the load on the middle ash containing the photocatalyst is uniform. Is preferable, and more preferably, it is constant.

In the photocatalytic filter according to the third aspect of the present invention, the angle at which the direction of the wave of the mesin intersects the opening surface of the cell is constant, and the angle is in the range of 15 ° to 60 ° and is adjacent. It is characterized in that the directions of the waves of the two inner ridges intersect, and as described above, the load on the photocatalyst becomes uniform, the shielding effect of the excitation light and the air permeability are excellent, and the air flow direction of each stage is offset. There is an advantage that the wind direction is uniform.

On the other hand, in the photocatalytic filter of the present invention, the angle at which the direction of the shin wave intersects the opening surface of the cell in each stage may be changed randomly or periodically, and the layer length of the cell or the cell may be varied. Since the direction of the wall is diversified, the range of noise such as wind noise can be widely dispersed, and the quietness may be improved.

The corrugated honeycomb in the photocatalytic filter of the present invention is made of a commonly used material. Although the type is not limited, for example, various types of paper, nonwoven fabric, sheets such as resin films, ceramic, glass, metal, and wood can be used. In the present invention, a fibrous sheet carrying a photocatalyst, such as paper, nonwoven fabric, or cloth, has a porous structure, and has many opportunities for contact between the photocatalyst and the odorous substance.

In order to make the photocatalyst filter of the present invention by supporting a photocatalyst on the above-mentioned various materials, for example, sheets such as various papers, nonwoven fabrics, resin films, etc. are prepared by incorporating, impregnating or kneading the photocatalyst. After being supported by the various methods described above, it can be processed into a corrugated honeycomb shape to produce a photocatalytic filter. Also, titanium oxide,
A photocatalyst filter may be produced using a photocatalyst such as zinc oxide as a constituent material of the corrugated honeycomb as it is.
In addition, to a structure that was previously processed into a corrugated honeycomb shape,
A photocatalyst filter may be produced by supporting various photocatalysts.

The photocatalyst filter according to the present invention is characterized in that the middle cylinder contains a photocatalyst, but a portion other than the middle cylinder such as a liner may contain the photocatalyst.

When the photocatalyst filter of the present invention is manufactured by supporting a photocatalyst on a structure previously processed into a corrugated honeycomb shape, the corrugated honeycomb-shaped structure is made of various deodorants as described below, among which an adsorbent is used. It is preferred to contain. In addition, the photocatalyst is preferably scattered and supported on the surface to be irradiated with light at the time of use, and the photocatalyst may be scattered so that the amount of the photocatalyst supported is uniform, or the photocatalyst supported on the portion irradiated with the excitation light The photocatalyst may be sprayed in such a manner that the photocatalyst is irradiated at the same angle as the excitation light when using the photocatalyst filter so as to increase the density.

The photocatalyst filter of the present invention may be any of various agents such as a deodorant, an antibacterial agent, an antifungal agent, an antiviral agent, an insecticide, an insecticide, an insect repellent, a fragrance, etc., without departing from the spirit of the present invention. May be used together. These various chemicals may be carried in combination with the photocatalyst, or may be separately carried with the photocatalyst. As a method of carrying the latter, for example, at least a sheet carrying the photocatalyst, and a sheet carrying various chemicals Can be used for a liner to produce the photocatalytic filter of the present invention.

The deodorant used in the present invention is a chemical used mainly for the purpose of removing offensive odors. Specifically, an adsorbent, iron ascorbic acid or a metal phthalocyanine derivative such as iron, cobalt or manganese is used. Enzymatic deodorizers, low-temperature oxidation catalysts such as manganese oxides and perovskite catalysts, synthetic ceramics such as silicon carbide, silicon nitride, calcium silicate, alumina / silica, zirconia, and far-infrared rays such as maltstone and felsongite Examples include ceramics, deodorants using catechin, tannin, flavonoids and the like, which are compounds contained in plant extract components. These deodorants may be used in combination as necessary.
Further, these deodorants may be combined to form a hybrid deodorant.

The deodorant used in the present invention is preferably an adsorbent, particularly one that mainly performs physical adsorption on the main odorous substance of interest, and particularly has a heat of adsorption of 46 kJ / m2 for the odorous substance.
ol (11 kcal / mol) or less, and is regenerated by a photocatalyst without saturating deodorizing properties by odorous substances.

The adsorbent used in the present invention includes activated carbon, impregnated activated carbon, activated carbon fiber, natural and synthetic zeolites, activated alumina, activated clay, sepiolite, iron compounds such as iron oxide, zinc oxide, magnesium oxide, silica , A silica-zinc oxide composite, a silica-alumina-zinc oxide composite, a composite phyllosilicate, an ion exchange resin, or a mixture thereof. Among the adsorbents, a porous substance having a large surface area sometimes functions as a carrier for the photocatalyst, and thus is preferable.

The adsorbent according to the present invention is not particularly limited, but is preferably a basic gas adsorbent or an aldehyde adsorbent.

The basic gas adsorbent is an adsorbent mainly containing an acidic substance, and specifically, such as fumaric acid, maleic acid, acrylic acid, methacrylic acid, crotonic acid, styrenesulfonic acid, and alginic acid. Examples thereof include polymers such as organic acids or their multimers, oligomers and polymers, inorganic adsorbents having an acidic group such as activated clay, and acid-impregnated activated carbon impregnated with an acidic substance such as phosphoric acid.

The aldehyde adsorbent according to the present invention is an adsorbent having a high affinity for aldehydes such as acetaldehyde and formaldehyde, and examples thereof include activated carbon impregnated with amine, high silica zeolite, and molecular sieve.

The amine-impregnated activated carbon according to the present invention is an activated carbon impregnated with an amine that causes a chemical adsorption reaction with various aldehydes.

The high silica zeolite according to the present invention comprises:
Chemically, it is a crystal of an aluminosilicate metal salt like a normal zeolite, but the ratio of silica to alumina in the crystal is particularly high, and the oxygen atom in the silica structure has little basicity.

Such a high silica zeolite does not participate in the formation of hydrogen bonds due to the Si—O—Si bond on the surface, exhibits hydrophobicity and does not adsorb water molecules, and thus can be used in a high humidity environment and a high temperature environment. It is also possible to efficiently adsorb aldehydes. Therefore, the high silica zeolite is sometimes called a hydrophobic zeolite.

Further, the high silica zeolite can adsorb not only aldehydes but also a wide range of odorous substances, for example, organic acids, ammonia, amines, ketones, sulfur-containing compounds such as hydrogen sulfide and mercaptans, and indoles. The adsorbent according to the present invention is particularly preferred.

It is preferable that the photocatalyst filter of the present invention can be washed with water so as to be able to wash and remove sulfate ions, nitrate ions, etc., which deteriorate the photocatalytic performance. In order to obtain water washability, it is preferable that the adhesive used for producing the corrugated honeycomb has appropriate water resistance, and that various chemicals such as a photocatalyst or a deodorant to be contained as desired are not leaked into water. It is preferable to carry it.

The photocatalyst filter of the present invention may have a dust-removing function. For example, at least a part of the liner or the inner lining may be made of a material having a dust-removing property such as an electret. For producing a corrugated honeycomb from a multilayer sheet obtained by laminating a sheet containing a sheet and a sheet-shaped electret filter, and a method for producing a corrugated honeycomb using a sheet-shaped electret filter for a sheet containing a photocatalyst in the middle and a liner, etc. Is mentioned.

The electret according to the present invention is a material that retains electric polarization semipermanently and applies an electric force to the outside, and captures particles by the electrostatic force. Examples of the charging method include an electro-electret, a heat electret, a radio-electret, a mechano-electret, a photo-electret, a magnet-electret, and the like, and those used industrially in a nonwoven fabric filter are mainly an electro-electret and a heat-electret. As a filter material, polypropylene or a copolymer mainly composed of propylene is often used, and an appropriate amount of a fatty acid metal salt such as aluminum stearate may be added to the above resin material for the purpose of improving heat resistance.

The photocatalyst filter of the present invention can be used for controlling insects, killing insects, repelling pests, without departing from the spirit of the present invention.
It may have various functions such as aroma, dehumidification, humidity control, moisture permeation, oil adsorption, cation removal or anion generation.

The photocatalyst filter of the present invention can pass a fluid to be purified. When the fluid is a gas, the ventilation means is not particularly limited,
Methods using blowers such as sirocco type, axial flow type, propeller type, turbo type, radial type, cross flow type and other fan motors, natural wind or wind generated by exhaust fans such as ventilation fans and air conditioners such as air conditioners A method using heat convection, a method using an air current generated by movement of a passenger car, and the like. On the other hand, the photocatalyst filter of the present invention may be installed on the inner wall of the device or the like to take advantage of its light receiving properties and used as a member that does not allow fluid to pass through.

The method of irradiating the photocatalytic filter of the present invention with excitation light includes black light, insect trap, health lamp, germicidal lamp, fluorescent lamp for general lighting, high-pressure mercury lamp, metal halide lamp, high-pressure sodium lamp, and ultraviolet light.
It is preferable to irradiate by providing a dedicated light source such as an ED, but in addition to the dedicated light source, it is also possible to use indirect light such as direct light or reflected light emitted from the light source built in the photocatalyst type air purifying device, or porous filter. It is possible to use irradiation of leakage light, irradiation of indoor illumination light such as a fluorescent lamp, and irradiation of sunlight outdoors or near a window. Irradiation of photocatalytic excitation light can be either continuous or intermittent, particularly when the device is installed inside a device that does not have a light source and is not exposed to excitation light during use, such as when the device is stopped. There is also a means for temporarily irradiating sunlight or indoor illumination light.

[0059]

EXAMPLES Hereinafter, the present invention will be described in more detail with reference to Examples, but the present invention is not limited thereto unless it exceeds the gist of the invention.

Example 1 A commercially available photocatalyst sheet (Aqua / Radit sheet, manufactured by Mitsubishi Paper Mills) was used for a liner and a middle lining, and JIS-Z-1 was used.
A single-sided corrugated cardboard corresponding to the A-stage is prepared in accordance with “Exterior corrugated cardboard” described in 516, and then the single-sided corrugated cardboard is laminated so that the directions of the waves of the shin do not intersect to form a corrugated block (see FIG. 1A). The photocatalytic corrugated honeycomb (see FIG. 1b) having a thickness of 10 mm was prepared by cutting the corrugated block so that the angle at which the direction of the wave of the shin and the opening surface of the cell intersected was 30 °. Was used as the photocatalyst filter of Example 1.

Example 2 In Example 1, B was replaced with a single-sided cardboard corresponding to the A-stage.
A photocatalytic corrugated honeycomb was prepared in the same manner as in Example 1 except that a single-sided corrugated cardboard equivalent to a step was used, and this was used as a photocatalytic filter of Example 2.

Example 3 A commercially available photocatalyst sheet (Aqua / Radit sheet, manufactured by Mitsubishi Paper Mills) was used for a liner and a middle lining to JIS-Z-1.
A single-sided corrugated cardboard corresponding to the A-stage is produced in accordance with the “corrugated cardboard for exterior” described in No. 516, and then the single-sided corrugated cardboard is sequentially laminated so that the direction of the wave of the shin is alternately perpendicular. (See FIG. 3).
10) cut the corrugated block in parallel with
A photocatalytic corrugated honeycomb having an angle of 45 mm and a constant angle at which the direction of the wave of the shin and the opening surface of the cell intersect was produced, and this was used as the photocatalytic filter of Example 3.

Example 4 In Example 3, B was replaced with a single-sided cardboard equivalent to A-stage.
A photocatalytic corrugated honeycomb was produced in the same manner as in Example 3 except that a single-sided corrugated cardboard equivalent to a step was used, and this was used as a photocatalytic filter of Example 4.

Example 5 A commercially available photocatalyst sheet (Aqua / Radit sheet, manufactured by Mitsubishi Paper Mills) was used for the liner and the inner lining to obtain JIS-Z-1.
A single-sided corrugated cardboard corresponding to the A-stage is produced in accordance with the “exterior cardboard” described in 516, and then the single-sided corrugated cardboard is sequentially laminated so that the directions of the waves of the shins intersect at an angle of 45 ° alternately. A corrugated block was prepared, and the corrugated block was cut in parallel with a diagonal line to produce a photocatalytic corrugated honeycomb having a thickness of 10 mm and a constant angle of 67.5 ° where the direction of the wave of the shin and the opening surface of the cell intersected was constant. This was used as the photocatalyst filter of Example 5.

Example 6 In Example 5, the single-sided cardboard corresponding to the A-stage was replaced with a B-sided cardboard.
A photocatalytic corrugated honeycomb was produced in the same manner as in Example 5 except that a single-sided corrugated cardboard equivalent to a step was used, and this was used as a photocatalytic filter of Example 6.

COMPARATIVE EXAMPLES 1 AND 2 In Example 1 or 2, the angle at which the direction of the shin shin wave intersects the opening surface of the cell was changed to 30 °, and the direction of the shin shin wave and the opening surface of the cell were changed. A photocatalytic corrugated honeycomb in which the direction of the mesin wave does not intersect with the opening surface of the cell is produced in the same manner as in Example 1 or 2 except that the angle at which The photocatalyst filters of Comparative Examples 1 and 2 were used in ascending order of the number.

Comparative Example 3 A commercially available photocatalyst sheet (Aqua / Radit sheet, manufactured by Mitsubishi Paper Mills) was used for a liner and a middle lining, and JIS-Z-1 was used.
A photocatalytic paperboard having a thickness of 10 mm was prepared by processing into a double-sided corrugated cardboard corresponding to the A-stage according to “Exterior corrugated cardboard” described in No. 516, and this was used as a photocatalytic filter of Comparative Example 3.

The following performance tests were performed on the photocatalyst filters of the examples and the comparative examples.

[Photocatalytic Performance] The photocatalyst filters of Examples and Comparative Examples were allowed to stand in a 5.6-liter closed vessel equipped with a 6 W black lamp so as to be in contact with the black lamp. Acetaldehyde was injected into the container to adjust the concentration of acetaldehyde when the adsorption equilibrium was reached to 15 ppm, and then the black lamp was turned on to irradiate ultraviolet rays,
5 minutes after the start of irradiation, the concentration of acetaldehyde in the container (pp
m) was measured with a gas chromatograph to determine the acetaldehyde removal rate (% / min).

[Light Shielding Property] As shown in FIG. 4, the photocatalyst filters of Examples and Comparative Examples were installed between a 6 W black lamp and an ultraviolet illuminometer, and an ultraviolet illuminance A (μW / cm) was used.
² ) was measured. This UV illuminance A and the UV illuminance B (μW / cm ² ) measured in a similar manner and without the photocatalyst filters of Examples and Comparative Examples under control conditions were divided by 100 to obtain a light transmittance (%). I asked. The lower the light transmittance, the better the light shielding property.

[Air permeability test] Pressure loss (Pa) of the photocatalyst filters of Examples and Comparative Examples at a wind speed of 1 m / sec was measured in accordance with JIS-B-9908. The smaller the value of the pressure loss, the better the air permeability.

Tests were conducted according to the above method, and the performance was evaluated. The results are shown in Table 1.

[0073]

[Table 1] The air permeability of Comparative Example 3 exceeded the limit of the pressure drop measuring device.

From the results shown in Table 1, it can be seen that the photocatalyst filter of the present invention has a high light shielding property and a unique light receiving property, and therefore has a high photocatalytic performance and excellent air permeability.

[0075]

According to the present invention, a novel photocatalytic filter having a unique light receiving property, which is a corrugated honeycomb-shaped photocatalytic filter having excellent air permeability, can be obtained. Such a photocatalyst filter of the present invention can achieve both air permeability and light receiving performance because the leakage of light can be reduced even when the cell hole is enlarged. Most suitable for combination with a minute light source. Therefore, according to the present invention, light is further leaked from the cell holes while taking advantage of the excellent characteristics of the corrugated honeycomb-shaped photocatalyst filter, ie, the air permeability and the size of the photocatalyst carrying area per unit area or air passing area. In particular, it solves the problem that part or most of the strongest light irradiated to the nearest part of the photocatalyst filter out of the light irradiated from the lamp leaks out of the cell hole, significantly increasing the value of the photocatalytic filter. To enhance.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment of a photocatalytic filter of the present invention and an embodiment of a corrugated block as a base thereof.

FIG. 2 is a perspective view showing an embodiment of a shin according to the photocatalytic filter of the present invention.

FIG. 3 is a perspective view showing one embodiment of a corrugated block serving as a base of the photocatalytic filter of the present invention.

FIG. 4 is an explanatory diagram showing the measurement of the shielding properties of the photocatalytic filters of Examples and Comparative Examples of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cutting line 2 Middle shin 3 Arrow showing direction of middle shin wave 4 Diagonal line 5 Photocatalytic filter of example or comparative example 6 Ultraviolet lamp 7 Ultraviolet illuminometer detector

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) B01D 53 / 36H

Claims (4)

[Claims] 1. A corrugated honeycomb filter containing a photocatalyst, wherein the direction of the wave of the mesin containing the photocatalyst intersects the opening surface of the cell. 2. The photocatalytic filter according to claim 1, wherein the directions of the waves of two adjacent mesins intersect. 3. The photocatalytic filter according to claim 2, wherein the angle at which the direction of the wave of the mesin intersects the opening surface of the cell is constant, and the angle is in the range of 15 ° to 60 °. 4. The photocatalytic filter according to claim 1, wherein the directions of the waves of two adjacent mesin do not intersect.