JPH11290656A - Hollow pipe and purification apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To heighten the decomposition function of a photocatalyst with a simple structure by forming a plurality of fine through holes in a matrix shape in pipe walls and setting a photocatalyst in the inner faces and the outer faces of the pipe walls for decomposing pollutants. SOLUTION: In this purification apparatus produced by installing a plurality of hollow pipes 1 in a cover-closed container having an injection inlet in the periphery of one end side and a discharge outlet in the periphery of the other end side, each hollow pipe 1 contains a photocatalyst particle 3 in the inner face side of the pipe wall and has a plurality of fine through holes 2 in a matrix shape in the pipe wall. The photocatalyst particle 3 is arranged by forcibly injecting a titania sol into each hollow pipe 1 or dipping each pipe in a titania sol. In the case each pipe is dipped in titania sol, the photocatalyst particle is stuck to the whole surface area of each hollow pipe 1. In this case, each of the hollow pipes 1 is made to have several mm or narrower diameter and the diameter of the fine through holes 2 is controlled to be several μm and the hollow pipes 1 are preferably made of a light transmissive material. Further, the hollow pipes 1 are produced from a material constituting of a base material and a photo-accumulating member mixed in the base material.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hollow tube for decomposing contaminants contained in a fluid such as air or water by receiving light, and a purifying apparatus provided with a plurality of such hollow tubes.

[0002]

2. Description of the Related Art As a water purifier for decomposing pollutants by photocatalysis, for example, Japanese Patent Laid-Open No. 10-5745 has been proposed. In this case, activated carbon, a hollow fiber membrane, and a particle member are used. In Japanese Utility Model Laid-Open Publication No. Hei 6-19895, a portable water purifier is aimed at, a photocatalyst layer is formed on an inner surface or an outer surface of a cylindrical body, and an antibacterial substance is stored inside the cylindrical body. Become.

[0003]

SUMMARY OF THE INVENTION
Japanese Patent Publication No. -19895 is intended to purify well water, spring water and the like in camps and the like, and the outer diameter of the cylindrical body is not specified, but it is estimated to be several cm. Although the size of the small hole is not specified, it is estimated to be several mm. Further, neither a plurality of cylinders are used in a bundle, nor a combination of the cylinders. JP 1
In Japanese Patent Publication No. 0-5745, the photocatalyst attached to the bead surface was not uniformly and sufficiently irradiated with ultraviolet rays, and there was a possibility that the efficiency of decomposing contaminants could not be increased.

[0004] It is an object of the present invention to solve the above-mentioned problems and to provide a hollow tube having a simple structure and an improved function of decomposing a photocatalyst, and a purification device using the same.

[0005]

In order to solve the above problems, a hollow tube according to the present invention is provided with a plurality of through-holes formed in a matrix on a tube wall for decomposing contaminants, and a hollow tube formed on the matrix. A photocatalyst was provided on the inner and outer surfaces. And the light storage member was mixed in the base material which comprises a hollow tube as needed. Further, a purifying apparatus is provided in which a plurality of the hollow tubes are bundled and arranged in a closed container having an inlet near one end and an outlet near the other end. further,
At least one of the lids for closing the container had a lens shape. Further, another purifying apparatus has a configuration in which the hollow tube is connected in a cord shape with a fastening thread or the like.

In the above construction, the base constituting the hollow tube is a light transmitting member such as glass, ceramics, a transparent resin member or the like. The diameters of the through-holes formed in the wall of the hollow tube were roughly divided into two types. One dimension is within a range of about several nanometers that allows oxygen and nutrients to pass through but can shut out immune cells, antibodies, viruses, bacteria, and the like. In this case, the outer diameter of the hollow tube is 100 μm
壁 about several hundred μm, and the wall thickness was about several μm〜１０10 μm.
The size of the other through-hole was about several hundred μm. In this case, the outer diameter of the hollow tube is about several mm, and the wall thickness is several hundred μ.
m.

As one of means for disposing a photocatalyst at least on the inner surface side of the tube wall surface (inner surface and outer surface) of the hollow tube,
The photocatalyst particles were mixed (mixed) with the liquid material and applied. For example, the photocatalyst is made of titanium oxide particles in the form of anatase crystals, and the titanium oxide particles are suspended in water and / or an organic solvent, or a slurry is applied. As the organic solvent, propanol,
Alcohols, esters, ethers, amines, hydrocarbons,
Alternatively, a mixture thereof or a member obtained by adding hydrochloric acid, nitric acid, or the like to water was used. The addition of a silane coupling agent or a titanium coupling agent to the titania sol solution, the addition of a surfactant to the solvent, or the like may be arbitrarily performed.

[0008] Another liquid material to be mixed with the photocatalyst includes acrylic resin, alkyd melamine resin, vinyl acetate resin, fluorine resin, silicon resin, epoxy resin, urethane resin, siloxane resin, UV resin ( UV curable resin), natural rubber, butyl rubber, vinyl chloride resin, phenolic resin, ABS resin, PS resin, styrene resin, polyamide resin, inorganic glass (glaze), PVA (polyvinyl alcohol / povar), etc. One.

It is desirable that the liquid mixed with the photocatalyst has a light transmitting property to receive near ultraviolet rays. However, this does not apply when the photocatalyst is impregnated with water or aniline.

As a means for disposing the photocatalyst on the surface of the hollow tube, in addition to the above-mentioned coating method, a method of dipping in titania sol, or forming a film-like photocatalyst layer by sputtering, vapor deposition, CVD, PVD, electrodeposition or the like. Needless to say, any means such as the above may be used.

Any member may be used as the photocatalyst.
For example, fine powder particles of a photocatalyst made of titanium dioxide or a mixture of titanium dioxide and activated carbon and the like were used. Powder particles of photocatalyst or liquid containing photocatalyst (solvent,
Any one of the forms of vehicle, paint, adhesive, etc. By disposing a thin film or a film of the photocatalyst itself on the surface of the target object, bacteria in the fluid can be killed or pollutants can be decomposed. That is, 300 nm to 4
The photocatalyst that has received near-ultraviolet light of 00 nm is activated and oxidizes and decomposes organic substances (acetaldehyde, ammonia, etc.), nitrogen oxides, chlorine compounds, and the like.

The fine powder particles of a photocatalyst comprising titanium dioxide or a mixture of titanium dioxide and activated carbon have an outer shape of several nm to several tens μm. In addition, the ratio to be contained in the liquid material was set to about several weight% to 50 weight%. The coating thickness may be arbitrarily determined. For example, it may be applied to a thickness of 0.1 μm to several μm. The means for applying the photocatalyst to the inner wall surface of the hollow tube may be arbitrarily implemented such as dip, spray, injection, and spin coating.

The titanium dioxide is preferably an anatase type, but may be a rutile type titanium dioxide metallized with copper, silver, platinum or other metals. Also, W
A photocatalyst may be formed of a semiconductor such as O ↓ 2, Cds, SrTiO ↓ 2, and MoS ↓ 2.

[0014] Further, the photocatalyst may be impregnated with water or an organic solvent (aniline or the like). The photocatalyst impregnated with water or an organic solvent may be mixed with a liquid material such as an arbitrary inorganic or organic binder, vehicle, paint, adhesive or the like, and applied to the surface of the target member. Water or an organic solvent evaporates during the heating and drying process of the liquid material to form pores in the photocatalyst holding film, thereby enabling the photocatalyst to be directly irradiated with near ultraviolet rays.

Further, the surface of the titanium oxide particles is covered with a photo-inert substance, the surface of the titanium dioxide particles is covered with a porous wall made of a photo-inert substance, or the surface of the titanium dioxide particles is 1 μm with ceramic apatite. Any one of the configurations, such as a configuration covering the thickness, may be used. As the photoinactive substance, silicon, aluminum, zirconium, calcium, barium, strontium,
Any one of magnesium, zinc, niobium, etc. or a combination thereof was used. By coating the surface of titanium dioxide with a photoinactive substance, a porous wall made of the photoinactive substance, apatite, etc., deterioration of the photocatalyst carrier (holding member) such as paper, resin, fiber, etc. can be reduced.

The luminous substance mixed (mixed) into the base of the hollow tube is, for example, Root Special Chemical / N night light, or Sr
Al ↓ 2O ↓ 4: Eu (emission peak wavelength 520 nm, afterglow luminance 300 mcd / m ↑ 2 (brightness after 20 minutes of irradiation at 200 LX for 4 minutes), afterglow time 2,000 minutes or more (0.3
Time required to decay to 2 mcd / m ↑ 2)), or ZNs: Cu, or ZnS, CdS, CaS, (Z
nCd) Any member such as one or two kinds of sulfide-based phosphorescent materials such as S may be used. The mixing ratio of the luminous substance to be mixed in the base material was about 0.1% by weight to 30% by weight.

When the base material of the hollow tube is made of resin, acrylic resin, epoxy resin, vinyl chloride, vinylidene chloride, styrene, polyacetal, urethane, silicone resin, polycarbonate resin, ABS, PS, PP, P
E, PET, PI, etc. may be used. In the case of ceramics, for example, alumina, forsterite, silicon carbide, silicon nitride and the like were used. In the case of glass, for example, silica glass,
Borosilicate glass, soda-lime glass and the like were used.

The hollow tube of the present invention has the above-described structure,
The photocatalyst decomposes pollutants contained in fluids such as water and air. In addition, the luminous substance absorbs and accumulates light from sunlight, fluorescent lamps, xenon lamps, halogen lamps, and the like, and can maintain brightness for a certain period of time even when lighting is interrupted and dark, and activates and functions the photocatalyst. Further, by forming through-holes in a matrix on the pipe wall, the number of contact machines between the fluid (water, air, etc.) and the photocatalyst is increased, and the efficiency of decomposing pollutants is improved.

[0019]

A first aspect of the present invention is characterized in that a phosphorescent member is mixed in a base material of a hollow tube and a plurality of through-holes and a photocatalyst are provided in a tube wall. When the fluid passes through the hollow tube through the fine holes, the chance of contact between the fluid and the photocatalyst increases, and the decomposition efficiency is improved. When light (ultraviolet rays) is irradiated from the end face side of the hollow tube, the light travels while being reflected on the tube wall as if it were traveling in the optical fiber, and the photocatalysts arranged on the tube wall are activated one after another. The efficiency of decomposing contaminants contained in the fluid is improved.

Further, a second invention is a hollow tube according to the first invention, characterized in that the diameter of the penetrating micropore is several nm, wherein the hollow tube is an immunocompetent cell, an antibody, a virus or a bacterium. Etc. can be shut out to obtain an ultra-clean fluid.

Further, according to a third aspect of the present invention, there is provided a closed container having an inlet near one end and an outlet near the other end.
A purifying apparatus characterized in that a plurality of hollow tubes according to the invention are arranged in a bundle, and the decomposition efficiency of pollutants contained in the fluid is improved. Further, the apparatus cost is low with a simple configuration.

Further, a fourth invention is the purifying apparatus according to the third invention, characterized in that at least one of the lids for closing the container has a lens shape. Irradiation can be performed efficiently from a hollow tube tanmen.

An embodiment of the present invention will be described below with reference to FIGS. (Embodiment 1) FIG. 1 is a cross-sectional view of a main part showing a concept of a purification apparatus 100 according to a first embodiment of the present invention, and FIG. 2 is a cross-sectional view of a main part of a concept of a hollow tube constituting a purification apparatus of the present invention. , FIG.
Shows an external view of FIG. 1 to 3, reference numeral 1 is a hollow tube, 2 is a fine hole penetrating the tube wall of the hollow tube, 3 is a photocatalyst such as TiO2 particles, 25 is a substrate constituting the hollow tube, and 10 is a medium. A closed container containing an empty tube and having a fluid inlet / outlet, 21 and 23 are a light source (ultraviolet irradiation source),
Reference numerals 2 and 24 denote a reflection plate or a reflection mirror, and 50 denotes a convex lens-shaped lid.

In the purifying apparatus of the present invention, a plurality of hollow tubes 1 (for example, about several hundred to 10,000) are placed in a closed container 10 provided with an inlet near one end and an outlet near the other end. It was configured to be bundled and arranged in a cylindrical shape. Although the container 10 shown in FIG. 1 has a cylindrical shape, it may have another shape such as a rectangular shape or a hexagonal shape.
Of course, when storing the hollow tubes in the container, the shape in which the hollow tubes are bundled may be a shape corresponding to the container. The container 10 has a cylindrical shape and is provided with a convex lens-shaped lid 25 at both ends in a confidential state. The outer diameter of the container shown in FIG. 1 was 5 cm or more, and the length of the cylinder was 5 cm or more. In the purification device according to the embodiment of the present invention, for example, the diameter is 10 cm and the length is 50 cm.
cm.

The convex lens-shaped lid 25 is intended to collimate a light source (ultraviolet radiation source) 23 disposed on the side or external light from the end face side of the hollow tube 1. Of course, the light source 23
A reflective mirror 24 may be arranged at the rear of the device to irradiate parallel light. Further, a light source 2 such as a fluorescent lamp or a xenon lamp is provided around the cylindrical container 10 in order to increase the photocatalytic decomposition function.
1 may be arranged annularly.

As shown in FIGS. 2 and 3, the hollow tube 1 is provided with photocatalyst particles 3 at a predetermined position on at least the inner side of the tube wall, and a plurality of through-holes 2 are formed in the tube wall in a matrix. It becomes. The photocatalyst particles were disposed by forcibly injecting the titania sol into the hollow tube or dipping in the titania sol. When dipping in the titania sol, the photocatalyst adheres not only to the inner surface of the hollow tube but also to the outer surface of the tube and the inner surface of the micropores 2, that is, to the entire surface of the hollow tube.

The outer diameter of the micropore or the hollow tube may be arbitrarily set according to the application. In this embodiment, the diameter of the micropore is about 1 mm.
The diameter of the straw-shaped tube was about 1 to 2 mm. The material was a transparent PET resin. Further, in another embodiment for the purpose of ultra-precise purification, the diameter of the micropore is several nm,
The straw-shaped tube had a diameter of about 200 μm. All were bundled and arranged in a cylindrical shape so as to fill the container 10.

It is needless to say that the photocatalyst is not limited to particles. For example, they may be arranged in a film or layer by means such as sputtering or vapor deposition. 5 and 6 show examples. The solvent for dispersing the photocatalyst is water or / and an organic solvent, such as a suspension in alcohol.
Alternatively, it may be a slurry. Or
The photocatalyst particles are made of crystalline anatase,
A suspension of particles in the range of several μm in water and / or an organic solvent, or a slurry is prepared to have a thickness of 0.0
When applied in the range of 1 μm to several μm,
The method may be arbitrarily carried out, for example, in the case of applying a suspension in propylene glycol having a range of m to several tens of μm.

Further, the phosphorescent substance is contained in the substrate 50 by several weight%.
By mixing in advance in the range of about 30 weight,
The surroundings are illuminated for a predetermined period of time to activate (function) the photocatalyst to decompose pollutants even when the light source or natural light is not irradiated.

As shown in FIG. 1, the purifying apparatus of the first embodiment forcibly flows a fluid from an inlet through a pump or the like, and contacts the photocatalyst sequentially through fine holes formed in the tube wall of each hollow tube. This decomposes pollutants (organic substances, nitrogen oxides, trihalomethane, chlorine compounds, etc.) contained in fluids such as water and air.

Needless to say, the fluid may be injected from the end face of the hollow tube in addition to the injection from the side of the hollow tube.

(Embodiment 2) FIG. 4 is a sectional view of a main part showing a concept of a purification apparatus 200 according to Embodiment 2 of the present invention.
FIG. 5 and FIG. 6 are cross-sectional views of main parts of the concept of the hollow tube constituting the purification device of the present invention. 4 to 6, reference numeral 11,
15 is a hollow tube, 16 is a fine hole penetrating the tube wall of the hollow tube,
13 is a photocatalyst such as TiO2 particles, 51 is a base constituting a hollow tube, 14 is a closed container containing the hollow tube and provided with a fluid inlet / outlet, 12 is a light emitting diode, a halogen lamp, a metal halide lamp, etc. Indicates a light source (ultraviolet irradiation source).

The purifying apparatus according to the present invention has a plurality of, for example, several hundred hollow tubes shown in FIG. 5 or FIG. 6 in a closed container 10 having an inlet near one end and an outlet near the other end. ~ 1
A configuration in which about ten thousand pieces are bundled and arranged.

The difference from the first embodiment is that the fluid is injected from one side of the hollow tube instead of passing through the fine hole from the side of the hollow tube, and from the other side of the hollow tube. The point is that it is configured to discharge. Further, the light source 12 is
4 built-in. Further, the photocatalyst was disposed on the tube wall surface in the form of a film by means such as sputtering and vapor deposition. With the above configuration, the pump load for forcibly injecting the fluid is reduced.
(Not shown.) As a result, injection can be performed even with the water pressure of the water supply, and it can be used as a water purifier. For the purpose of a water purifier, the outer diameter of the container 14 is about 5 cm, and the length of the container is 1
It was about 0 to 15 cm. The outer diameter of the hollow part is several hundred μm to 1
mm.

(Embodiment 3) FIG. 7 is a perspective view of a main part showing the concept of a cord-shaped purifier 300 according to Embodiment 3 of the present invention. In FIG. 7, reference numeral 31 denotes a hollow tube, and 32 denotes a fine hole penetrating the tube wall of the hollow tube. In this case, the purifying device has a plurality of micropores 32 formed in a matrix on the tube wall, and a hollow tube having a photocatalyst disposed on the inner and outer surfaces of the tube wall is connected to each other with a fastening thread in the form of a blind.

The hollow tube 31 is formed by extruding a resin member such as vinyl chloride into a straw shape, and the fine holes formed in the tube wall have a diameter of several μm to several hundred μm and an outer diameter of 1 mm to
It was about 4 mm. Of course, it goes without saying that the length, outer diameter, micropore diameter, material and the like of the hollow tube may be arbitrarily set according to the purpose. Means for disposing the photocatalyst in the hollow tube 31 may be implemented in the same manner as in the first or second embodiment.

The above-mentioned screen-shaped purifying device is a ventilation device, a dehumidifying device,
It can be used as a filter device for oil fan heaters and the like.
In addition, it is suspended from windows and entrances and receives sunlight to decompose nitrogen oxides and the like contained in the air. Further, the hollow tube 31
Decomposes dirt adhering to the surface and always presents a clean surface. The sunlight not only irradiates the surface of the hollow tube but also activates the photocatalyst on the inner surface of the hollow tube through the fine holes. In addition,
It goes without saying that also in the third embodiment, the hollow pipes shown in FIGS. 2, 5, and 6 may be connected in a blind shape.

[0038]

As described above, according to the present invention, the photocatalysts disposed on the inner and outer surfaces of the hollow tube efficiently decompose contaminants contained in the fluid, and exhibit an antibacterial effect. The luminous substance emits light for a certain period of time even after the sunlight or the lighting is interrupted, illuminates the surroundings, and functions as a photocatalyst. As a result, a compact and inexpensive purifying device can be configured.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a main part of a concept of a purification device according to a first embodiment of the present invention.

FIG. 2 is a sectional view of an essential part of a concept of a hollow tube constituting the purification device of FIG.

FIG. 3 is an external view of FIG. 2;

FIG. 4 is a sectional view of a principal part of a concept of a purification device according to a second embodiment of the present invention.

FIG. 5 is a sectional view of a main part of the concept of a hollow tube constituting the purification device of the present invention.

FIG. 6 is a sectional view of a main part of a concept of a hollow tube constituting the purification device of the present invention.

FIG. 7 is a perspective view of an essential part of a concept of a cord-shaped purifying device according to a third embodiment of the present invention.

[Explanation of symbols]

 1,11,31 Hollow tube 2,32 Micropore (several nm to several hundred μm) 3 Photocatalyst particles 10,14 Vessel 12,21,23 Light source (ultraviolet irradiation source) 22,24 Reflector (reflector) 25 Lid 50,51 Substrate 100,200,300 Purification device

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁶ Identification code FI C02F 1/72 101 B01D 53/36 J

Claims (22)

[Claims] 1. A hollow tube having a plurality of through-holes and a photocatalyst disposed in a tube wall. 2. A plurality of through-holes and a photocatalyst are provided on a tube wall, wherein the outer diameter of the tube is several mm or less, and the diameter of the through-holes is several hundred μm. Hollow tube. 3. A method in which a plurality of through-holes and a photocatalyst are provided on a tube wall, the outer diameter of the tube is several hundred μm or less, and the diameter of the through-holes is several nm. Claim 1
The hollow tube as described. 4. The hollow tube according to claim 1, wherein the tube is formed of a light transmitting member. 5. A hollow tube characterized in that a light-storing member is mixed in a base material of the hollow tube, and a plurality of through-holes and a photocatalyst are arranged on the surface of the tube wall. 6. The hollow tube according to claim 5, wherein the diameter of the through-hole is several hundred μm. 7. The hollow tube according to claim 5, wherein the diameter of the through-hole is several nm. 8. The hollow tube according to claim 5, wherein the tube is formed of a light transmitting member. 9. The hollow tube according to claim 1, wherein the photocatalyst is titanium oxide particles. 10. A structure in which the surface of the titanium oxide particles is covered with a photoinactive substance, a structure in which the surface of the titanium oxide particles is covered with a porous wall made of a photoinactive substance, or a structure in which the surface of the titanium oxide particles is covered with apatite of ceramics. The hollow tube according to claim 9, wherein any one of the hollow tubes is used. 11. A plurality of hollow tubes according to any one of claims 1 to 10, arranged in a closed container having an inlet near one end and an outlet near the other end. A fluid purifying device, comprising: 12. The fluid purifying apparatus according to claim 11, wherein an ultraviolet irradiation means is provided on at least one end face side of the closed container. 13. The fluid purifying apparatus according to claim 11, further comprising an ultraviolet irradiation means provided around the closed container. 14. The fluid purifying apparatus according to claim 11, wherein at least one of the lids for closing the container has a lens shape. 15. A closed vessel having an inlet near one end and an outlet near the other end, a plurality of hollow tubes having a photocatalyst disposed on the tube wall surface in a closed container. Fluid purification device. 16. The fluid purifying apparatus according to claim 15, wherein the photocatalyst is one of a titanium oxide particle and a titanium oxide thin film. 17. The fluid purifying apparatus according to claim 16, wherein a phosphorescent member is mixed in the base material of the hollow tube. 18. An apparatus according to claim 15, wherein an ultraviolet irradiation means is provided on at least one end surface side of the closed container.
The purifying apparatus according to any one of claims 17 to 17. 19. The apparatus for purifying a fluid according to claim 18, wherein an ultraviolet irradiation means is provided around the closed container. 20. The fluid purifying apparatus according to claim 15, wherein at least one of the lids for closing the container has a lens shape. 21. A fluid purifying apparatus comprising: a hollow pipe having a photocatalyst disposed on a pipe wall surface and connected in a blind pattern. 22. An apparatus for purifying a fluid, wherein a hollow tube having a plurality of through-holes and a photocatalyst arranged on the surface of a tube wall is connected in a blind shape.