JP2016032804A - Self-destructive carbon dioxide generator and carbon dioxide generating system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a self-destructive carbon dioxide generator with which carbon dioxide is efficiently generated by a simple system, and to provide a carbon dioxide generating system in which the self-destructive carbon dioxide generator is installed.SOLUTION: A self-destructive carbon dioxide generator of this invention includes a photocatalyst and a solid kneaded product containing an organic binder 52 kneaded with the photocatalyst 51 as a main component, and satisfies following (i), (ii). (i) The organic binder 52 disintegrates by photocatalysis of the photocatalyst 51 and generates carbon dioxide. (ii) When the kneaded product 60 is irradiated with an active ray directed to the photocatalyst 51 with intensity of 0.8 mJ/cm.sec, carbon dioxide is generated with a generation rate of 0.1 nL/cmsec or more at atmospheric temperature and pressure.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a self-destructing carbon dioxide generator and a carbon dioxide generating system using a photocatalyst.

  Photocatalysts that exhibit catalytic action by irradiation with actinic rays such as ultraviolet light and visible light are used as air purification materials that remove harmful substances, deodorizing materials that decompose bad odors, and water purification materials that decompose and remove organic compounds dissolved in water. ing. In addition, it is applied as an antibacterial material using the oxidation action of a photocatalyst, and as an antifouling material that prevents dirt on window glass and outer walls. Furthermore, the application to the use for attracting mosquitoes, the use to inactivate allergens such as pollen, and the use for promoting growth to plants have been proposed.

  Patent Document 1 proposes a blood-sucking mosquito trapping device having an attracting lamp that emits ultraviolet rays, and an attachment frame that is attached with an adhesive sheet for capturing attracted flying insects and holds a photocatalyst. The organic compound floating in the air is decomposed into carbon dioxide by the oxidizing action of the photocatalyst, and blood-sucking mosquitoes are attracted by the carbon dioxide and captured by the adhesive sheet. Patent Document 2 proposes a multi-functional mosquito collector having the following configuration as a method for attracting mosquitoes. In other words, 1) attracts mosquitoes at the wavelength of near-ultraviolet light, and 2) fills the inside of the body with an attractant of an acidic liquid, and the temperature inside the body is raised by irradiation with an ultraviolet LED lamp, imitating human body odor 3) A device is proposed that attracts mosquitoes by facilitating the generation of odors, 3) Titanium oxide is provided inside the main body, removes off-flavors generated by lightning mosquitoes, and decomposes organic substances in the air into carbon dioxide and water. ing.

  Patent Document 3 proposes a culture apparatus for culturing plants, microorganisms, and the like using at least a nutrient solution in a state isolated from soil. Specifically, the outer surface of the fabric fibers constituting the purification filter is coated with a photocatalyst, and harmful microorganisms and other contaminants contained in the solution are decomposed and removed by the photocatalytic purification action, so that the nutrient solution is in good condition. It is described that the growth of the plant can be promoted by carbon dioxide generated by the purifying action as well as maintaining. In Patent Document 4, a visible light responsive photocatalyst is fixed to a carpet surface with a binder resin with the object of efficiently deactivating allergens such as pollen attached to the carpet surface and decomposing it into water and carbon dioxide. A method has been proposed.

JP 2006-87371 A JP 2013-39080 A JP 2011-24462 A JP 2008-237793 A

  As a mosquito collector, a method of attracting mosquitoes by supplying carbon dioxide with a carbon dioxide cylinder and / or irradiating with an ultraviolet fluorescent lamp and igniting with a high voltage has been proposed. There was a problem that it was necessary to provide it and was expensive. On the other hand, according to the methods of Patent Documents 1 and 2, since organic substances floating in the air are decomposed with a photocatalyst to generate carbon dioxide, there is a merit that the apparatus can be miniaturized. However, it was not enough to attract mosquitoes, and had a problem that the effect of attracting mosquitoes was low. In addition, for the purpose of promoting the growth of plants, the means for supplying carbon dioxide using a cylinder facility or the method of Patent Document 3 has a problem in that the replacement work is costly and has a problem in versatility.

  The present invention has been made in view of the above-mentioned background, and the object of the present invention is a self-destructing carbon dioxide generator capable of generating carbon dioxide with high efficiency by a simple system, and carbon dioxide generation equipped with the same. Is to provide a system.

As a result of extensive studies by the present inventors, it has been found that the problems of the present invention can be solved in the following modes, and the present invention has been completed.
[1] A self-destructing carbon dioxide generator that includes a photocatalyst and a solid kneaded material mainly composed of an organic binder in which the photocatalyst is kneaded, and satisfies the following (i) and (ii).
(I) The organic binder self-destructs by the photocatalytic action of the photocatalyst to generate carbon dioxide.
(Ii) When the kneaded product is irradiated with an actinic ray with respect to the photocatalyst at an intensity of 0.8 mJ / cm ² · sec, carbon dioxide is emitted at a normal temperature and normal pressure, and the unit area of the actinic ray irradiated is 0.00. 1 nL / cm ² · sec or more occurs.
[2] In the self-destructing carbon dioxide according to [1],
The self-destructing carbon dioxide generator in which (ii) satisfies the following (iii).
(Iii) When the kneaded product is irradiated with an actinic ray with respect to the photocatalyst at an intensity of 0.8 mJ / cm ² · sec, carbon dioxide is emitted at normal temperature and normal pressure, and 1 nL / unit area per unit area irradiated with the actinic ray It occurs more than cm ² · sec.
[3] The self-destructing carbon dioxide generator according to [1] or [2], wherein the kneaded product is any one of beads, films, sheets, and gels.
[4] The self-destructing carbon dioxide generator according to any one of [1] to [3], wherein the kneaded product is supported on a support.
[5] The organic binder is a saturated hydrocarbon resin or / and hydroxyl group, amino group, carboxyl group, epoxy group, isocyanate group, ether bond, glycoside bond, ester bond, amide bond, urea bond, urethane bond, guanidino group, The self-destructing carbon dioxide generator according to any one of [1] to [4], wherein the main component is a resin containing at least one of an imidazolyl group, an indolyl group, a mercapto group, a carbonate bond, an acetal bond, and an imide bond.
[6] The photocatalyst is a metal oxide semiconductor containing at least one selected from TiO ₂ , ZnO, SrTiO ₃ , SnO ₂ and WO ₃ which may have a promoter.
The self-destructive property according to any one of [1] to [5], wherein the promoter is a substance containing at least one of Pt, Pd, Cu (II), Fe (III), Au, Ag, Ru, and Ni. Carbon dioxide generator.
[7] The self-destructing carbon dioxide generator according to any one of [1] to [6] used for capturing mosquitoes.
[8] The self-destructing carbon dioxide generator according to any one of [1] to [7], which is used for promoting plant growth.

[9] A carbon dioxide generating system using the self-destructing carbon dioxide generator according to any one of [1] to [8].
[10] The carbon dioxide generation system according to [9], further including a light source capable of exciting the photocatalyst.
[11] The carbon dioxide according to [9] or [10], wherein a residence space for retaining carbon dioxide generated from the self-destructing carbon dioxide generator is provided, and 600 ppm or more of the carbon dioxide is released from the residence space to the outside. Generating system.
[12] A carbon dioxide generation system comprising a photocatalyst and a self-destructive carbon dioxide generator provided with a solid kneaded material mainly composed of an organic binder into which the photocatalyst is kneaded,
The organic binder generates carbon dioxide by self-destructing by the photocatalytic action of the photocatalyst, and provides a retention space for retaining the carbon dioxide generated from the self-destructive carbon dioxide generator. A carbon dioxide generating system that releases 600 ppm or more of the carbon dioxide.

  According to the present invention, there is an excellent effect that a carbon dioxide generator capable of generating carbon dioxide with high efficiency with a simple system and a carbon dioxide generation system equipped with the carbon dioxide generator can be provided.

It is sectional drawing which shows an example of the carbon dioxide generator which concerns on 1st Embodiment. It is a schematic diagram of the bead which is a kneaded material which concerns on a modification. It is a schematic diagram which shows an example of the carbon dioxide generation system which concerns on 2nd Embodiment. FIG. 4 is a sectional view taken along the line IV-IV in FIG. 3. It is a typical perspective view which shows an example of the carbon dioxide generation system which concerns on another modification. It is a typical top view which shows an example of the carbon dioxide generation system which concerns on another modification. It is a typical side view showing an example of a carbon dioxide generating system concerning a 3rd embodiment. FIG. 8 is a cross-sectional view taken along the line VIII-VIII in FIG. 7. Absorption spectrum of TiO ₂ and WO _3, and is a graph plotting the number of photons that can be used in the reaction with respect to the wavelength. 2 is a graph in which the carbon dioxide generation concentration is plotted against the actinic ray irradiation time on the sample of Example 1. FIG. It is the graph which plotted the carbon dioxide generation density with respect to the actinic-light irradiation time to the sample of Examples 1 and 2. FIG.

Hereinafter, an example of an embodiment of the present invention will be described.
[First Embodiment]
The self-destructing carbon dioxide generator according to the first embodiment (hereinafter also referred to as “carbon dioxide generator”) includes a solid kneaded material mainly composed of a photocatalyst and an organic binder in which the photocatalyst is kneaded, The following (i) and (ii) are satisfied.
(I) The organic binder self-destructs by the photocatalytic action (oxidation action) of the photocatalyst to generate carbon dioxide.
(Ii) When the kneaded product is irradiated with an actinic ray with respect to the photocatalyst at an intensity of 0.8 mJ / cm ² · sec, carbon dioxide is emitted at normal temperature and normal pressure, and 0.1 nL / unit area per unit area irradiated with the actinic ray It occurs more than cm ² · sec.

  The kneaded product is not particularly limited as long as it is solid, but preferred examples include beads, films, sheets, gels, molded products having a desired shape, and the like. These may be formed alone or on a support such as a substrate. Moreover, the kneaded material may be carried on the carrier. Examples of the support include nonwoven fabric, paper, cloth, metal, glass, fiber, alloy, ceramic, resin, metal oxide, metal carbide, metal boride, metal nitride, graphite, and a mixture thereof.

  The actinic ray includes the entire band of light that exhibits activity with respect to the photocatalyst, and any wavelength within this zone can be used for the self-destructing carbon dioxide generator of the present invention. However, the carbon dioxide generation amount described above may be realized by a wavelength that exhibits the maximum catalyst efficiency. The irradiation intensity specified in (ii) above is defined for quantifying the amount of carbon dioxide, and the irradiation intensity when using the self-destructing carbon dioxide generator of the present invention is not specified. Absent. That is, in this invention, the irradiation intensity | strength with respect to a kneaded material can be set arbitrarily.

  The carbon dioxide generating system according to the first embodiment is equipped with the aforementioned self-destructing carbon dioxide generator and generates carbon dioxide. The carbon dioxide generating system according to the first embodiment can be applied to all uses for generating carbon dioxide by irradiation with actinic rays, such as mosquito collection, plant growth promotion, and microorganism culture. In addition, the size and ratio of each member in the following drawings are for convenience of explanation, and are not limited to this.

  The self-destructing carbon dioxide generator according to the first embodiment includes a kneaded material in which a photocatalyst is dispersed in an organic binder. FIG. 1 shows a schematic cross-sectional view of a carbon dioxide generator. The carbon dioxide generator 1 is obtained by forming a film 55 on a support 33, and the film 55 is kneaded that satisfies the above-described conditions (i) and (ii) in which the above-described photocatalyst 51 is kneaded in an organic binder 52. Composed of things. The amount of carbon dioxide generated can be adjusted by the type of photocatalyst, the average particle diameter of the photocatalyst, the amount of photocatalyst kneaded with the organic binder, the degree of dispersion of the photocatalyst, the active light intensity, the type of organic binder, and the like.

The photocatalyst 51 is excited by irradiation of a light source or / and actinic rays of external light such as sunlight and room light. The excited photocatalyst 51 self-destructs the organic binder 52 to generate carbon dioxide. The kind of photocatalyst 51 should just satisfy the said conditions, and is not specifically limited. Preferred examples include metal oxide semiconductors composed of titanium dioxide (TiO ₂ ), zinc dioxide (ZnO), strontium titanate (SrTiO ₃ ), tin dioxide (SnO ₂ ), tungsten oxide (WO ₃ ), and the like. A semiconductor obtained by doping may be used. In order to further increase the photocatalytic activity of these semiconductors, platinum (Pt), palladium (Pd), silver (Ag), gold (Au), rhodium (Ru), nickel (Ni), iron (Fe) ), A material supporting a promoter such as a copper compound can also be used. In particular, titanium oxide, zinc oxide, tungsten oxide, and strontium titanate supporting Cu (II) and Fe (III) cluster-like particles are known to exhibit photocatalytic activity under visible light. Can also be used suitably. Titanium dioxide is preferable from the viewpoint of being inexpensive and biosafety is established, and an iron-based or copper-based compound titanium oxide material is preferable from the viewpoint of low cost and visible light responsiveness. A photocatalyst is used alone or in combination of two or more.

  The shape and particle size of the photocatalyst 51 are not particularly limited, but are preferably in the form of particles, for example, those having a size of about 5 to 5000 nm can be used. The shape of the particles can take various forms such as a spherical shape, a flake shape, and a needle shape. From the viewpoint of increasing the production rate of carbon dioxide, the average particle diameter is preferably 10 nm or more and 1000 nm or less. In general, visible light and / or ultraviolet light is preferably used for the active light band of the photocatalyst 51. From the viewpoint of efficiently using sunlight, particularly indoor light, it is preferable to use a visible light responsive photocatalyst. When a UV light source is used for the purpose of attracting mosquitoes by ultraviolet light, ultraviolet light is used. A responsive photocatalyst is preferred.

The optimum value of the amount of generated carbon dioxide of the self-destructing carbon dioxide generator of the present invention can be varied depending on the application to be used, and can be designed as appropriate. From the viewpoint of providing a carbon dioxide generating system capable of generating CO2, in the first embodiment, a self-destructing carbon dioxide generator satisfying the above (i) and (ii) is used. From the viewpoint of generating carbon dioxide more efficiently, when actinic light with respect to the photocatalyst is irradiated with an intensity of 0.8 mJ / cm ² · sec, carbon dioxide is irradiated with active light at normal temperature and normal pressure. it is more preferable to generate the area per 0.4nL ^/ cm 2 · sec or more, and more preferably generates 0.7nL ^/ cm 2 · sec or more. Further, from the viewpoint of improving quality, it is preferable that the photocatalyst 51 is uniformly mixed with the organic binder 52. When an actinic ray to the photocatalyst is irradiated at an intensity of 0.8 mJ / cm ² · sec, the organic binder is self-destructed by the oxidation of the photocatalyst at normal temperature and normal pressure, and carbon dioxide is generated at 1 nL / cm ² · sec or more. By using the kneaded product, carbon dioxide can be generated with high efficiency. In order to promote attraction of mosquitoes or photosynthesis of plants and microorganisms, carbon dioxide is preferably ² nL / cm at normal temperature and pressure when irradiated with an actinic ray against the photocatalyst at an intensity of 0.8 mJ / cm ² · sec. ² · sec or more, more preferably, it is preferable to generate 3nL ^/ cm 2 · sec or more. From the viewpoint of efficiently generating carbon dioxide, the organic binder preferably exhibits a high transmittance with respect to the active light band of the photocatalyst.

  The type of the organic binder is not particularly limited as long as it satisfies the above conditions (i) and (ii). From the viewpoint of generating carbon dioxide by advancing self-destruction by a photocatalyst, saturated hydrocarbon resin and / or hydroxyl group , Amino group, carboxyl group, epoxy group, isocyanate group, ether bond, glycoside bond, ester bond, amide bond, urea bond, urethane bond, guanidino group, imidazolyl group, indolyl group, mercapto group, carbonate bond, acetal bond and imide What has as a main component the resin containing at least any one of a coupling | bonding is preferable. Unless the photocatalytic action of actinic rays is hindered, unsaturated hydrocarbons and the like are also preferably used. Further, from the viewpoint of not generating nitrogen oxides, sulfur oxides, halogen oxides, etc., the resin is preferably composed only of C atoms, O atoms, and H atoms. From the viewpoint of ease of decomposition, a resin having a simple molecular structure and easily detaching a carbon bond chain by oxidative decomposition is preferable. An example of such a resin is a resin having a long-chain hydrocarbon structure. Specific examples include polysaccharides such as cellulose, hydrocarbon compounds such as liquid paraffin, carboxyl group-containing resins such as vinyl acetate, and hydroxyl group-containing resins such as polyvinyl alcohol. Among these, cellulose is particularly preferable because it contains a large number of carbon atoms, has a simple molecular structure, and easily detaches a carbon bond chain by oxidative decomposition. The organic binder can be used alone or in combination of two or more.

  Examples of the method of forming the film 55 include a method in which a kneaded product is dispersed or dissolved in a solvent and a method of coating and drying on the support 33, a method of bonding via an adhesive layer, and a method of lamination. As a method for forming the kneaded product, a known method such as a method of dispersing an organic binder and a photocatalyst in a solvent can be used without limitation. Although it does not specifically limit as a support body, Plastics and glass, such as a polyethylene terephthalate, can be utilized suitably. In order to generate carbon dioxide from both surfaces of the film 55, a material through which carbon dioxide permeates can be used as the support 33, or a large number of fine holes can be provided in the support 33. Moreover, it is good also as a structure which clamps only the frame area | region of the film 55 from the up-down direction of the film 55 with a support body. Moreover, you may apply the coating liquid in which the kneaded material melt | dissolved or disperse | distributed directly to various members.

  A kneaded material such as a film generates carbon dioxide by photocatalysis, so that the organic binder itself breaks down and generates carbon dioxide. For this reason, the photocatalyst (for example, particles) near the light irradiation site, particularly near the surface, becomes powdery with the organic binder disappearing. These are preferably washed with water or vibrated in the air to remove the powdered photocatalyst and prevent a decrease in carbon dioxide generating function.

  In the mosquito collectors according to Patent Documents 1 and 2, carbon dioxide obtained by decomposing organic matter in the air is used for attracting mosquitoes by photocatalytic reaction of titanium dioxide coated inside the device. The amount of titanium dioxide coated on the thin film is low in the amount of titanium dioxide on the thin film and decomposes organic matter in the air to generate carbon dioxide, so the concentration of carbon dioxide is too low and attracts mosquitoes It was far from the amount of carbon dioxide (about 600 ppm) that was sufficient. On the other hand, according to the carbon dioxide generator 1 according to the first embodiment, since the photocatalyst is kneaded in the organic binder, the photocatalyst can be oxidized with high efficiency by actinic ray irradiation, resulting in efficient operation. Carbon dioxide can be generated. In addition, although the carbon dioxide generation amount to generate | occur | produce changes with uses, as a method of making a carbon dioxide generation amount into a desired amount, in addition to the method of using the self-destructive carbon dioxide generator which generates a desired amount, for example, As in the second embodiment to be described later, a method of adjusting the apparatus so that the amount of carbon dioxide generated released from the apparatus becomes a desired amount can be suitably applied. The latter method can also be applied to the case where carbon dioxide generated from the self-destructing carbon dioxide generator has decreased over time.

(Modification) The carbon dioxide generator according to the present invention can be variously modified. For example, a film or sheet consisting of a kneaded product can be used as a carbon dioxide generator without using a support. Further, the kneaded product may be filled in the cartridge, or the kneaded product may be supported on the support. In the following drawings, the same element members are denoted by the same reference numerals, and the description thereof is omitted as appropriate.

  FIG. 2 shows an example of a bead-like kneaded product. The beads 50 are formed by dispersing a particulate photocatalyst 51 in an organic binder 52. The particle size (diameter) of the beads 50 may vary depending on the application, but may be, for example, about 1 mm to 1 cm. If the particle size is too small, the period during which the amount of carbon dioxide required for use can be generated is shortened, and if the particle size is too large, light will not easily reach the entire particle due to light absorption by the photocatalyst. The lower limit of the particle size of the beads is preferably 0.1 mm or more, more preferably 0.5 mm or more, and preferably 1.0 mm or more. Further, the upper limit of the particle size of the beads is preferably 12 mm or less, more preferably 8 mm or less, and particularly preferably 4 mm or less. The amount of carbon dioxide generated varies depending on the particle size of the beads, and the behavior of the amount of carbon dioxide generated over time also varies, so adjust the beads so that the desired amount of carbon dioxide is obtained by combining beads with different particle sizes. Also good.

  The particle shape of the beads 50 is not particularly limited, and for example, spherical, rod-like, flake-like particles can be used. The manufacturing method of the beads 50 is not particularly limited, and a known method can be used without limitation. For example, it can be obtained by pelletizing a kneaded product of the photocatalyst 51 and the organic binder 52, pulverizing or granulating the kneaded product.

  The ratio between the organic binder and titanium oxide is related to the time and amount of carbon dioxide that can be generated. The ratio of the organic binder (the volume of the organic binder / (the volume of the organic binder + the titanium oxide)) can be appropriately set according to needs in consideration of the amount of carbon dioxide to be generated and the lifetime, but should be 1-60% Is preferred. By containing a large amount of titanium oxide, the amount of carbon dioxide that can be generated can be increased, while the life is shortened. The lower limit of the organic binder is more preferably 2% or more, further preferably 5% or more, and particularly preferably 10% or more. Further, the upper limit of the organic binder is preferably 50% or less, more preferably 40% or less, and particularly preferably 30% or less.

  As the granulation method, there may be methods such as mixed granulation, forced granulation, and heat-utilization granulation. However, mixed granulation is the most desirable because a binder is used for the production of this granule. As mixing granulation, methods such as rolling granulation, fluidized bed granulation, and stirring granulation are conceivable. Among these, rolling granulation can be selected as either a dry type or a wet type as a binder, and the particle size distribution can be selected. A wide granulated product can be expected. A tilted shallow circular container is tilted by 40-50 ° and rotated at 10-30 rpm to supply powder, and an appropriate amount of liquid binder is added, or a tilted drum is rotated, and powder is fed from one side of the drum. The method of supplying a body and discharging as a granular body from one side is mentioned.

[Second Embodiment]
Next, application examples of the carbon dioxide generator and the carbon dioxide generation system will be described.
FIG. 3 is a schematic perspective view showing an example in which the carbon dioxide generation system according to the second embodiment is used for collecting mosquitoes. The mosquito collector 2 which is a carbon dioxide generating system has a box-shaped configuration with a space formed therein, and a mosquito collecting unit 11 is provided at the bottom, and a light source unit 13 is provided at the top. A generation unit 12 is installed. The mosquito collecting unit 11 and the light source unit 13 are configured to be detachable from the carbon dioxide generating unit 12. A mosquito entrance 14 which is an opening for attracting mosquitoes is provided at the lower side of the light source unit 13. A plurality of exhaust ports 15 for discharging carbon dioxide at a high concentration are provided on the side surface of the carbon dioxide generating unit 12.

  FIG. 4 is a cross-sectional view taken along the line IV-IV in FIG. The carbon dioxide generation unit 12 has a double cylinder structure with a circular shape in plan view. The double cylinder type structure includes an outer cylinder 27 constituting an outer shell, and an inner cylinder 26 arranged to face the outer cylinder 27 with a predetermined gap. A carbon dioxide generator 22 having a donut shape in plan view and extending in the Y-axis direction is disposed on the outer main surface of the inner cylinder 26 so as to follow the cylinder. The inner space 20 inside the inner cylinder 26 is defined by the inner surface of the inner cylinder 26, the inner upper surface of the light source unit 13, and the inner side surface of the mosquito collecting unit 11. The inner cylinder 26 and the outer cylinder 27 are made of a material that can transmit the active light of the photocatalyst used. That is, a visible light transmissive material is used for a visible light responsive photocatalyst, and an ultraviolet light transmissive material (for example, a plastic material or glass) is used when an ultraviolet light responsive photocatalyst is used.

  A plurality of exhaust ports 15 are provided in the outer cylinder 27 constituting the outer main surface of the carbon dioxide generating unit 12. In addition, a low air permeability net 25 that restricts the entry and exit of air is disposed on the upper surface of the cylindrical structure including the outer cylinder 27 and the inner cylinder 26. While the carbon dioxide generated in the carbon dioxide generator 22 stays in the stay space 21, it mainly flows from the exhaust port 15 to the outside due to the difference in pressure loss between the low-breathing net 25 and the exhaust port 15 and the specific gravity difference between carbon dioxide and air. To be released. The difference in pressure loss between the low-breathing mesh 25 and the exhaust port 15 can be adjusted by, for example, the mesh size, diameter, thickness, material, and the like. With the above configuration, carbon dioxide is released at a high concentration from the exhaust port 15 on the side surface of the mosquito collector 2.

  By designing the carbon dioxide generating capacity of the carbon dioxide generator 22, the discharge amount of the exhaust port 15, the pressure loss difference between the low-breathing net 25 and the exhaust port 15, the size of the staying space 21, etc. The carbon dioxide concentration released into the water can be adjusted to a desired concentration. Although the carbon dioxide emission concentration discharged from the exhaust port 15 may vary depending on the use, it is preferably 600 ppm or more and preferably 800 ppm or more from the viewpoint of making the concentration sufficiently higher than the carbon dioxide concentration in the atmosphere. More preferably, it is more preferably 1000 ppm or more. By setting it to 600 ppm or more, mosquitoes can be attracted with high efficiency. In addition, it is good also as an apparatus which can change the opening size of the exhaust port 15 and the low air permeability net | network 25, or can switch the volume of the residence space 21 so that the desired carbon dioxide generation amount can be maintained. Further, the exhaust amount may be set to a desired value by limiting the number of times the exhaust port 15 and the low air permeability net 25 are opened, that is, the number of times of ventilation. In this way, when the amount of carbon dioxide generated from the carbon dioxide generator is changed according to the application, or when the amount of carbon dioxide generated decreases over time, the amount of carbon dioxide generated is adjusted to the desired amount. Can do.

  The inner cylinder 26 is provided with a plurality of fine holes 28 for allowing carbon dioxide generated from the carbon dioxide generator 22 to pass therethrough. Thereby, the carbon dioxide generated from the carbon dioxide generator 22 can also be sent into the internal space 20, and the carbon dioxide concentration in the internal space 20 can be made higher than the carbon dioxide concentration in the air. However, the fine hole 28 is not essential, and when it is difficult to design the carbon dioxide concentration of the exhaust port 15 to a desired value, for example, 600 ppm or more, a mechanism for feeding carbon dioxide into the internal space 20 is not provided, and the carbon dioxide is not provided. It is effective to have a configuration in which carbon dioxide generated from the carbon generator 22 is exclusively discharged to the staying space 21. That is, while the carbon dioxide generated in the carbon dioxide generator 22 stays and concentrates in the stay space 21, the exhaust port is caused by the difference in pressure loss between the low air permeability net 25 and the exhaust port 15 and the specific gravity difference between carbon dioxide and air. A design that releases carbon dioxide from 15 to the outside is effective.

  In the internal space 20, an air circulation fan 23 fixed to an inner cylinder 26 constituting the side surface of the carbon dioxide generating unit 12 is installed. The air circulation fan 23 creates a flow of air from the mosquito entrance 14 toward the inside of the apparatus, and the mosquito 9 is guided from the mosquito entrance 14 into the mosquito collector 2. The air circulation fan 23 may be automatically activated according to the operation of the mosquito collector 2 or may be arbitrarily turned on / off. A tapered portion 24 that reduces the area in plan view is provided below the carbon dioxide generating unit 12 and is configured so that the opening area decreases as it goes downward. It communicates with the unit 11.

  The mosquito collecting unit 11 is an area where the mosquito 9 is finally captured. On the side surface of the mosquito collecting unit 11, a plurality of exhaust ports 16 for releasing the internal air to the outside are provided. The entrance 31 on the upper surface of the mosquito collecting unit 11 is provided with an opening / closing mechanism (not shown) that is isolated from the carbon dioxide generating unit 12, and the mosquito collecting unit 11 is closed when removing the collected mosquitoes. And can be removed.

The light source unit 13 plays a role of irradiating the active light of the photocatalyst. The heat generated by using the light source 30 also serves as a heat source that attracts mosquitoes. Moreover, when the light source 30 contains ultraviolet light, it also has an effect of attracting mosquitoes. Since mosquitoes have an infrared sensing function and a property attracted by ultraviolet light, heat and ultraviolet light may be used in combination. In 2nd Embodiment, the structure which uses together sunlight or indoor light other than the light source 30 as an actinic ray is employ | adopted. If the photocatalyst can be sufficiently excited by sunlight or room light, the light source 30 is turned off. If the sunlight or room light is weak or cannot be used, the light source 30 is turned on. Thereby, energy saving is realizable. Even when the amount of light is sufficient due to sunlight or the like, the light source may be used for attracting mosquitoes by a heat source or ultraviolet light. Further, an infrared light generation unit different from the light source 30 may be provided to generate heat. The emitted light intensity of the light source 30 may be configured to be adjustable according to the intensity of sunlight or the like.
The on / off determination of the light source 30 is performed based on the result of the sunlight / indoor light intensity measurement unit 18. In the light source unit 13, an electric circuit for operating the light source 30 and the sunlight / indoor light intensity measuring unit 18 is incorporated. Instead of measuring the light intensity, the irradiation condition of the light source 30 may be determined by detecting the carbon dioxide concentration.

  The carbon dioxide generator 22 is filled with beads 50 shown in FIG. 2, and the cartridge is detachably attached to the outer side surface of the inner cylinder 26. The carbon dioxide generator 22 in which the amount of carbon dioxide required for use is no longer released is configured to be replaced with a new one.

  According to the carbon dioxide generation system according to the second embodiment, since the photocatalyst is kneaded with the organic binder, there are a large amount of objects to be decomposed around the photocatalyst. For this reason, compared with the said patent documents 1, 2, the amount of carbon dioxide generation can be increased significantly. Moreover, if the heat generation effect of the light source 30 and ultraviolet light are used, the mosquito attracting effect can be further enhanced. Furthermore, since sunlight or indoor light is used in combination as the active light, energy saving can be achieved. Moreover, since mosquitoes can be collected without using insecticides or electric shock methods, the human body is safe and harmless.

(Modification) The mosquito collector according to the second embodiment is an example, and various modifications are possible. For example, the mosquito collector of FIGS. 3 and 4 can arrange a light source on the inner side surface of the inner cylinder 26 without arranging a light source in the light source unit 13. By installing a light source on the inner side surface, it is possible to effectively prevent the collection of light-grown insects. In addition, the photocatalyst can be activated with high efficiency. Further, in order to increase the light receiving rate of sunlight on the side surface of the carbon dioxide generating unit 12, a taper that increases in area as it goes downward may be provided. As another modification, the mosquito collecting unit 11 and the light source unit 13 of FIG. 3 can be installed upside down. In addition, the light source does not necessarily have to be integrally provided in the mosquito collector, and a separate light source may be attached when necessary or may be irradiated without being attached.

  Moreover, in 2nd Embodiment, what packed the bead 50 as a carbon dioxide generator was used, However, You may use the sheet-like thing and the carbon dioxide generator 1 of 1st Embodiment. Moreover, you may form the layer of a carbon dioxide generator on the both wall surfaces of the inner cylinder 26 by coating. Moreover, you may use what carried the kneaded material on carriers, such as carbon fiber.

  In FIG. 5, the typical perspective view of an example of the mosquito collector 3 which is a carbon dioxide generation system which concerns on another modification is shown. The mosquito collector 3 is a hanging type, and includes a light source 30b at the left end in the figure, and a film 55b that is a self-destructing carbon dioxide generator is disposed in an adjacent area. At the right end of the mosquito collector 3 in the figure, there is an adhesive tape take-up portion 62, and the adhesive tape is drawn out to the adjacent area so that the adhesive surface is exposed on the surface. The front end surface of the adhesive tape is guided and fixed to the back surface side. Carbon dioxide is generated by irradiating the mosquito collector 3 with actinic rays, and the temperature rises due to the heat generated by the operation of the light source 30b to attract mosquitoes. And the attracted mosquitoes are captured by the adhesive tape. The adhesive tape that has lost the adhesive force required for use is pulled out from the back side of the mosquito collector 3, and unnecessary parts are cut by a cutter attached to the back side. In addition, the film 55b in which the amount of carbon dioxide necessary for use is no longer released can be replaced with a new film. Further, in the mosquito collector 3 of FIG. 5, sunlight or room light may be used without providing a light source, or irradiation may be performed with a separate light source. In that case, you may use a heat source as needed. The configuration shown in FIG. 5 has an advantage that the device configuration is simple.

  In FIG. 6, the typical top view of the mosquito collector 4 which is a carbon dioxide generation system which concerns on another modification is shown. The mosquito collector 4 has a rectangular box structure without an upper surface. An LED sheet 30d is attached to one of the side surfaces, and a sheet-like carbon dioxide generator 22d is installed on the LED sheet 30d. An adhesive sheet 61d is attached to the inner wall including the bottom surface other than the installation surface of the LED sheet 30d.

  Mosquitoes are attracted by carbon dioxide and guided into the mosquito collector 3 from the mosquito intrusion port 14d on the upper surface. And it is captured by the adhesive sheet 61d. When it is desired to use it while sleeping, the casing of the mosquito collector 3 may be made of a light shielding material and designed so that the light from the LED sheet 30d does not leak outside. By disposing the LED sheet and the carbon dioxide generator directly or close to each other, carbon dioxide can be generated with high efficiency while saving energy.

[Third Embodiment]
Next, the example which uses a carbon dioxide generator or a carbon dioxide generation system for a plant growth promotion use is demonstrated. FIG. 7 is a schematic side view showing an example of the carbon dioxide generation system 5 according to the third embodiment, and FIG. 8 is a sectional view taken along the line VIII-VIII in FIG. In the carbon dioxide generating system 5, carbon dioxide having a desired concentration is supplied from a cylinder-shaped cylindrical housing 70 to a plant cultivation container 73 via a pipe 71. A concentration sensor 74 for measuring the concentration of carbon dioxide is provided in the plant cultivation container 73, a control valve 72 is provided in the pipe 71, and the carbon dioxide in the plant cultivation container 73 is based on the measurement result of the concentration sensor 74. The concentration is kept constant. A plurality of air inlets 76 are provided below the side surface of the cylindrical housing 70 so that air containing high-concentration carbon dioxide generated in the cylindrical housing 70 can be smoothly sent to the plant cultivation container 73.

  A cylindrical light source 30e is provided at the center of the inside of the cylindrical housing 70, and a fan 23e for sending carbon dioxide to the plant cultivation container 73 is provided near the bottom. A cylindrical cartridge-like carbon dioxide generator 22e is disposed with a predetermined gap from the light source 30e. The carbon dioxide generator 22e is disposed so as to face the inside of the side wall surface that constitutes the outline of the carbon dioxide generation system 5 with a predetermined gap. A space surrounded by the light source 30e and the carbon dioxide generator 22e and a region surrounded by the carbon dioxide generator 22e and the cylindrical housing 70 are residence spaces 21e that contain high-concentration carbon dioxide generated from the carbon dioxide generator 22e. It has become. The carbon dioxide filled in the staying space 21e is supplied into the box-type plant cultivation container 73 through the pipe 71 by the flow by the fan 23e and the control valve 72.

  According to the carbon dioxide generating system 5, carbon dioxide can be easily supplied to the plant cultivation container 73 by an external device. The carbon dioxide generator 22e is configured to be detachable from the cylindrical housing 70, and can be easily changed to a new one after the end of its life. According to the third embodiment, carbon dioxide can be supplied with high efficiency by a simple system. Further, it is possible to supply carbon dioxide to the plant cultivation container 73 at a predetermined concentration.

(Modification)
In the third embodiment, instead of the columnar light source 30e and the carbon dioxide generator 22e, a structure in which an LED sheet or the like and a sheet-like carbon dioxide generator are stacked and wound is incorporated in the cylindrical housing 70. You may let them. Further, a cartridge-like carbon dioxide generator or a sheet-like carbon dioxide generator as shown in FIG. 4 may be directly installed on a wall surface or the like in a box-type plant factory. For example, in a form like FIG. 1, the method of sticking on the wall surface in a plant factory using an adhesive sheet as the support body 33 can be illustrated. Moreover, you may apply the kneaded material of this invention directly to the wall surface in a box-shaped plant factory. In addition, a carbon dioxide generator composed of a bead-like kneaded material as described in FIG. 2 or a carbon dioxide generator filled in a cartridge is arbitrarily installed at a position close to a plant and capable of being irradiated with actinic rays. May be. Moreover, it is not limited to a plant factory use, You may install a small carbon dioxide generator in plant cultivation kits, such as a vegetable and a flower. It can also be used in outdoor fields. For example, the support rod that supports the plant may be made of a sunlight-transmitting material, provided with an air entrance / exit hole, and filled with beads as a kneaded material to generate carbon dioxide.

  The present invention is not limited to the above-described embodiments and modifications, and it goes without saying that other embodiments may belong to the category of the present invention as long as they match the gist of the present invention. Moreover, the said embodiment and modification are mutually combined suitably.

<Example>
Hereinafter, the present invention will be described in more detail with reference to examples. However, the present invention is not limited to the following examples.

Titanium dioxide (TiO ₂ ) and tungsten oxide (WO ₃ ) were used as the photocatalyst. FIG. 9 shows a plot of the absorption spectrum in the ultraviolet / visible light band and the number of photons that can be used for the photocatalytic reaction in TiO ₂ and WO ₃ . The number of photons that can be used for the reaction has a maximum value. For example, when irradiating an actinic ray of 0.8 mJ / cm ² · sec, the energy of light increases as it goes to the short wavelength side, and therefore, the number of photons decreases with an actinic ray having a short wavelength. On the other hand, the photocatalyst cannot cause a photocatalytic reaction unless it is irradiated with light having energy greater than or equal to the band gap, and the photocatalyst absorbs light on the short wavelength side well because of its high light energy. Therefore, an optimum value of a wavelength that can be suitably used as an actinic ray is obtained from the wavelength dependency of the number of photons and the wavelength dependency of photon absorption in the photocatalyst. As shown in FIG. 9, the wavelength of optimum active rays of the TiO ₂ is 340 nm, the wavelength of optimum active rays WO ₃ is 380 nm, further, WO ₃ it can be seen that absorbs visible light to near 460 nm.

Therefore, a black light (20 W, manufactured by Toshiba Corporation) that can irradiate light in a band of 300 to 400 nm with a central wavelength of 360 nm is used as the TiO ₂ actinic ray. Further, as the active rays WO _3, (1) the above-mentioned black light, or (2) UV rays xenon lamp (Hayashi Watch Kogyo, 150 W) was used. In order to cut ultraviolet rays when using a xenon lamp, a Y-43 filter manufactured by Asahi Techno Glass was used so that a wavelength region of 460 nm or less was irradiated. The intensity of the black light was 0.8 mJ / cm ² · sec as measured by a UV illuminance meter (body: UVR-2, probe: UD-36) manufactured by Topcon Corporation. Moreover, the intensity | strength of the xenon lamp which cut | disconnected ultraviolet light was 0.6 mJ / cm < ² > / sec by the value measured with the spectrum illuminometer (USR-40D) by the Ushio Electric company.

(Example 1) As a kneaded material, beads having a diameter of 3 to 5 mm obtained by kneading titanium dioxide with cellulose were used. Content of titanium dioxide was 85-120 mass parts with respect to 100 mass parts of cellulose.

The above-mentioned beads were placed on a petri dish having a radius of 3.2 cm, and the carbon dioxide (CO ₂ ) concentration over time with respect to actinic rays was traced in an apparatus in which the beads were placed in a glass sealed space having a volume of 0.5 L. The sealed space before light irradiation was filled with synthetic air having a relative humidity of 50%. As an irradiation light source, a 20 J / second black light manufactured by Toshiba Corporation was used. The illuminance of light was irradiated with ultraviolet light of 0.8 mJ / cm ² · sec using a UV illuminance meter (UVR-2, UD-36) manufactured by Topcon Corporation. The amount of CO ₂ generated was measured using a multi-gas monitor manufactured by INNOVA. After the measurement, the sealed container was opened, filled with synthetic air having a relative humidity of 50% again, and the second measurement was performed in the same procedure. After the second measurement, the sealed container was opened, the white powder on the surface of the beads was shaken off, filled with synthetic air having a relative humidity of 50% again, and the third measurement was performed in the same procedure.

(Example 2)
A similar experiment was performed using the sample of Example 1 except that the irradiation intensity of ultraviolet light was changed to 0.4 mJ / cm ² · sec.

Figure 10 shows a diagram plotting the relationship between the irradiation time and the amount of produced CO ₂ in Example 1 (concentration). Five minutes after the irradiation with ultraviolet light, it was confirmed that the CO ₂ concentration in the sealed space exceeded 600 ppm (initial CO ₂ production rate 2.58 nL / cm ² · sec). In the second measurement, the CO ₂ production rate was slower than that in the first measurement. This is considered to be due to the organic binder being reduced due to self-destruction, but it is 10,000 ppm or more after 100 hours of light irradiation, that is, 600 ppm or more that is effective in inducing mosquitoes by 5 hours of light irradiation (initial CO ₂ It was confirmed that high-concentration CO ₂ with a production rate of 0.818 nL / cm ² · sec) was produced. The CO ₂ production rate in the third experiment was higher than that in the _second experiment because the photocatalyst segregated on the surface due to the self-destruction of the organic binder was removed by the process of shaking off, and ultraviolet rays were transmitted from the surface to a deep position. As a result, the CO ₂ production ability was recovered.

FIG. 11 shows changes in CO ₂ between Example 1 and Example 2. From this figure, it can be seen that when the light intensity is doubled, the CO ₂ production rate is also doubled, and the photocatalytic activity depends on the amount of light. That is, it has been clarified that the CO ₂ generation amount can be arbitrarily controlled by the light intensity and the irradiation area.

From the result of FIG. 11, the CO ₂ concentration was calculated when the sample of Example 1 set to 0.8 mJ / cm ² · sec was applied to the mosquito collector shown in FIG. 3 of the second embodiment. In the calculation, the following conditions were applied.
Residence part dimension: CO ₂ residence part outer diameter = 19 cm,
CO ₂ retention part inner diameter = catalyst outer diameter = 17 cm,
Residence part width = 1 cm, catalyst layer thickness = 1 cm,
CO ₂ retention part height = 15cm
Ventilation frequency N = flow rate of air in the retention portion per hour / CO ₂ concentration released from the retention portion volume retention portion = amount of CO ₂ generated from the catalyst in 1 hour / (retention portion volume × ventilation frequency)

As a result, the following knowledge was obtained.
(1) In the case where the intensity of ultraviolet rays is 0.8 mJ / cm ² · sec, the CO ₂ concentration released from the staying portion exceeds 600 ppm capable of attracting mosquitoes 5 minutes after irradiation with ultraviolet rays.
(2) When the number of times of ventilation of the carbon dioxide staying part is 5 times per hour and the structure is such that CO ₂ does not flow from the carbon dioxide generator 22 to the inner cylinder side, 1 hour after irradiation with ultraviolet rays The CO ₂ concentration released from the stagnation part is 2200 ppm, and the emission amount is 4240 cm ³ / h. Further, the CO ₂ concentration released from the staying part after 100 hours from the ultraviolet irradiation is 1140 ppm, and the CO ₂ concentration released from the staying part after 450 hours from the ultraviolet irradiation is 800 ppm.

Incidentally, CO ₂ is exhaled amount of human occurs during ^{sleep: 0.37m} 3 ^{/h=6.2L/min,CO} ₂ concentration to 4%, CO ₂ emissions: 6.2 × 0.04 = because it is ^{0.248L / min = 248cm 3 / min} = 14480cm 3 / h, the CO ₂ that occurs less than CO ₂ human generated during sleep, there is no risk of harm to humans.

Moreover, in the Example of FIG. 11, the presence of gas phase reaction products other than CO ₂ was measured using a gas chromatograph mass spectrometer (GCMS-QP2010) manufactured by Shimadzu Corporation. As a result of observing the peak of the gas chromatograph mass spectrometer after irradiating for 24 hours, the presence of carbon monoxide (CO) as a gas phase substance other than CO ₂ was observed, but its concentration was higher than that of CO ₂ . It was 3 digits lower. Further, although a very small amount of carboxylic acid molecules could be observed, the amount was smaller than the lower limit of quantification of the apparatus. In other words, the reaction product observed in this example is almost CO ₂ , and although a compound containing a very small amount of CO and carboxylic acid is produced, they are not present at a concentration that is harmful to human health. confirmed.

As a result of repeated experiments by the present inventors, it has been found that the amount of CO ₂ generated varies depending on the type of photocatalyst, particle size, binder ratio, or active light source. The results of studying these values are shown below.

(Example 3) Titanium dioxide (NP400, manufactured by P & E Corp. Ltd.) was used as a photocatalyst, and 30 parts by mass of an organic binder (Theolas (registered trademark)) was used with respect to 100 parts by mass of titanium dioxide. A bead was prepared in the same manner as in Example 1 except that the bead particle size was 2 mm, and the same evaluation was performed.

(Example 4) Beads were produced in the same manner as in Example 3 except that the organic binder was 20 parts by mass with respect to 100 parts by mass of titanium dioxide, and the same evaluation was performed.

(Example 5) A bead was produced in the same manner as in Example 5 except that the particle size of the bead was 5 mm, and the same evaluation was performed.

(Example 6) Beads were prepared in the same manner as in Example 3 except that tungsten oxide (Lumiresh CW-1) was used instead of titanium dioxide as a photocatalyst, and the bead particle size was 4 mm. Evaluation was performed.

(Example 7) Evaluation similar to Example 6 was performed except that visible light was irradiated using the above-described xenon lamp instead of black light as an actinic ray. Visible light illuminance was 26000 Lx, and the irradiation intensity of active light was 0.6 mJ / cm ² · sec.

(Example 8) The same as Example 3 except that titanium dioxide containing rutile (P-25, manufactured by Degussa) was used as titanium dioxide, and the particle size (diameter) of the beads was 2.6 mm. Beads were produced by the method described above, and the same evaluation was performed.

In Example 3～6,8, by irradiating ultraviolet light to measure the CO ₂ concentration after 1 hour at an intensity of 0.8mJ ^/ cm 2 · sec, it was calculated CO ₂ production rate. In Example 7, visible light was irradiated at an intensity of 0.6 mJ / cm ² sec, the CO ₂ concentration after 1 hour was measured, and the CO ₂ production rate was calculated. These results are shown in Table 1.

In Example 7, the actinic ray intensity (0.6 mJ / cm ² ) was lower than in other Examples, but it was confirmed that the CO ₂ production rate was higher than 0.1 nL / cm ² sec. Moreover, as shown in Table 1, the CO ₂ production rate of Example 6 was found to be approximately the same as that of Example 6. In addition, it was confirmed that the CO ₂ generation rate fluctuates relatively greatly depending on the particle size of the beads, the mixing ratio of the binder, and the particle size of the photocatalyst particles. For example, from Examples 4 and 5, the CO ₂ production rate after 1 hour of actinic ray irradiation is more advantageous when the bead particle size is 2 mm than 5 mm. It has been found that the CO ₂ production rate varies greatly depending on the presence of the photocatalyst and the particle size and properties of the photocatalyst particles.

1, 22 Self-destructing carbon dioxide generator 3-4 Mosquito collector 5 Carbon dioxide generating system 9 Mosquito 11 Mosquito collecting unit 12 Carbon dioxide generating unit 13 Light source unit 14 Mosquito intrusion port 15, 16 Exhaust port 18 Sunlight / indoor Light intensity measurement unit 20 Internal space 21 Retention space 23 Air circulation fan 24 Tapered part 25 Low air permeability network 26 Inner cylinder 27 Outer cylinder 28 Micro hole 30 Light source 31 Entrance part 33 Support body 50 Bead 51 Photocatalyst 52 Organic binder 55 Film 62 Adhesion Tape winding unit 70 Cylindrical housing 71 Pipe 72 Control valve 73 Plant cultivation container 74 Concentration sensor 75 Discharge port 76 Inlet port

Claims (12)

A photocatalyst,
A solid kneaded material mainly composed of an organic binder kneaded with the photocatalyst,
A self-destructing carbon dioxide generator that satisfies the following (i) and (ii).
(I) The organic binder self-destructs by the photocatalytic action of the photocatalyst to generate carbon dioxide.
(Ii) When the kneaded product is irradiated with an actinic ray with respect to the photocatalyst at an intensity of 0.8 mJ / cm ² · sec, carbon dioxide is emitted at a normal temperature and normal pressure, and the unit area of the actinic ray irradiated is 0.00. 1 nL / cm ² · sec or more occurs. The self-destructing carbon dioxide generator according to claim 1,
The self-destructing carbon dioxide generator in which (ii) satisfies the following (iii).
(Iii) When the kneaded product is irradiated with an actinic ray with respect to the photocatalyst at an intensity of 0.8 mJ / cm ² · sec, carbon dioxide is emitted at normal temperature and normal pressure, and 1 nL / unit area per unit area irradiated with the actinic ray It occurs more than cm ² · sec.   The self-destructing carbon dioxide generator according to claim 1 or 2, wherein the kneaded product is any one of beads, films, sheets, and gels.   The self-destructive carbon dioxide generator according to any one of claims 1 to 3, wherein the kneaded product is supported on a support. The organic binder is
Saturated hydrocarbon resin or / and hydroxyl group, amino group, carboxyl group, epoxy group, isocyanate group, ether bond, glycoside bond, ester bond, amide bond, urea bond, urethane bond, guanidino group, imidazolyl group, indolyl group, mercapto group The self-destructing carbon dioxide generator according to any one of claims 1 to 4, comprising a resin containing at least one of a carbonic acid bond, an acetal bond, and an imide bond as a main component. The photocatalyst is a metal oxide semiconductor containing at least one selected from TiO ₂ , ZnO, SrTiO ₃ , SnO ₂ and WO ₃ which may have a promoter.
The self-destructive property according to any one of claims 1 to 5, wherein the promoter is a substance containing at least one of Pt, Pd, Cu (II), Fe (III), Au, Ag, Ru, and Ni. Carbon dioxide generator.   The self-destructing carbon dioxide generator according to any one of claims 1 to 6, which is used for capturing mosquitoes.   The self-destructing carbon dioxide generator according to any one of claims 1 to 6, which is used for promoting plant growth.   A carbon dioxide generation system using the self-destructing carbon dioxide generator according to any one of claims 1 to 8.   Furthermore, the carbon dioxide generation system of Claim 9 provided with the light source which can excite the said photocatalyst. Providing a retention space for retaining carbon dioxide generated from the self-destructing carbon dioxide generator;
The carbon dioxide generating system according to claim 10, wherein 600 ppm or more of the carbon dioxide is released to the outside from the staying space. A carbon dioxide generating system equipped with a self-destructing carbon dioxide generator comprising a photocatalyst and a solid kneaded material mainly composed of an organic binder in which the photocatalyst is kneaded,
The organic binder generates carbon dioxide by self-destruction by the photocatalytic action of the photocatalyst,
Providing a retention space for retaining the carbon dioxide generated from the self-destructing carbon dioxide generator;
A carbon dioxide generating system that releases 600 ppm or more of the carbon dioxide to the outside from the staying space.

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