JP3715591B2 - Filter material manufacturing method, photocatalytic filter material manufacturing method, photocatalytic filter, and photocatalytic filter device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
  The present invention relates to a filter material in which a granular material is bonded to each surface of a large number of linear objects.UsedThe present invention relates to a photocatalytic filter and a photocatalytic filter device.
[0002]
[Prior art]
In recent years, a photocatalyst such as titanium dioxide is formed on the surface of a light-guided linear or fibrous filter material, and a large number of these are bundled so as to form a predetermined gap between them, thereby forming a filter bundle. The fluid to be treated is circulated through the gap, and the contaminants contained in the fluid to be treated are trapped on the surface of each filter material, and light is introduced into each photocatalyst filter material to photocatalyze the captured contaminants. There has been proposed a photocatalytic filter that can be decomposed by the above (see, for example, JP-A-9-225262).
[0003]
In the photocatalyst filter as described above, an appropriate gap should be formed between the linear or fibrous filter materials, and at the same time, the surface of the filter material should be provided with as much irregularities as possible to easily capture contaminants. is important. This point is the same in ordinary filters other than the photocatalytic filter.
[0004]
As a method of forming irregularities on the surface of a linear or fibrous filter material, a method of adhering a large number of granular materials having an appropriate particle size to the surface of the linear or fibrous material is conceivable.
[0005]
[Problems to be solved by the invention]
However, the actual situation is that a suitable method for forming a filter material by bonding a large number of particles having an appropriate particle diameter to the surface of a linear or fibrous material has not been developed yet. In order to use as a filter material, a large amount of a linear material or the like in which a large number of granular materials are bonded is required. For this reason, it is necessary to quickly bond a large number of granular materials to each of the large number of linear objects.
[0006]
As the method, for example, it is conceivable that a large number of linear objects are bundled, a large number of granular materials are present between them, an adhesive is supplied, and then the individual linear objects are divided and cured. However, in this method, when the bundle is released and divided into individual linear objects, a linear object with a large amount of particulate matter and a linear object with almost no particulate matter are formed, and a uniform filter is formed. It turns out that the material cannot be manufactured.
[0007]
  The present invention has been made under the above-mentioned background, and is a filter material comprising a homogeneous linear material having a large number of granular materials bonded to the surface.UsedAn object is to provide a high-performance photocatalytic filter and a photocatalytic filter device.
[0008]
[Means for Solving the Problems]
  Means for solving the above-mentioned problemsAs a means related toThe method of manufacturing a filter material is a method of manufacturing a large number of filter materials in which a large number of granular materials are bonded to the surface of a linear object, and a diameter smaller than the diameter of the linear object between the numerous linear objects. A pretreatment process for forming a mixture in which a large number of granular materials are present and an adhesive is interposed between the linear materials and the granular materials, and an acceleration motion such as vibration or oscillation is applied to the mixture. By drying or curing the adhesive while allowing the linear objects to move relative to each other, the granular material is stacked on the surface of the linear object in a plurality of stages and bonded and fixed in an island shape. With adhesive curing processTo do.
[0009]
  As a means related to the means for solving the above problemsA method for producing a photocatalytic filter material is a method in which a large number of glass spheres are bonded to the surface of a glass fiber, and a large number of photocatalytic filter materials are produced on the surface, and the diameter of the glass fiber is interposed between the many glass fibers. A number of glass spheres with a smaller diameter than the pretreatment step of forming a mixture in which an adhesive is interposed between the glass fibers, and applying an acceleration motion such as vibration or oscillation to the mixture, An adhesive in which the glass spheres are stacked on the surface of the glass fiber in a plurality of stages and bonded and fixed in an island shape by drying or curing the adhesive while allowing the glass fibers to move relative to each other. Curing processHave.
[0010]
  As means for solving the above problems,The photocatalytic filter according to the present invention isLinear objectMany on the surface ofGranular materialAre bonded together, and a large number of photocatalyst filter materials having photocatalysts formed on the surface thereof are bundled to form a filter bundle having a gap between the photocatalyst filter materials, and the fluid to be treated is fed from one end face of the filter bundle. The photocatalytic filter is introduced to capture contaminants contained in the fluid to be treated on the surface of each filter material and to introduce light into each photocatalyst filter material to decompose the captured contaminants by photocatalytic action. And saidGranular materialThe diameter isLinear objectSmaller than the diameter ofLinear objectIt is characterized by being laminated and fixed in an island shape on a plurality of steps on the surface.
[0011]
  The photocatalytic filter device according to the present invention includes a photocatalytic filter, a filter case main body that houses the photocatalytic filter, and flange portions provided on both sides of the filter case main body, and the side of the flange portion on the one side An inlet for the fluid to be treated is provided in a portion, an outlet for the fluid to be treated is provided in a side portion of the flange portion on the other side, and the photocatalytic filter is provided in a front portion of the flange portion on the one side. A glass window for allowing light to enter is provided, and as the photocatalytic filter,The photocatalytic filter according to the present inventionIt is characterized by using.
[0012]
  In the present inventionUsedThe filter material manufacturing method will be explained with specific examples.,It is as follows. First, in the pretreatment step, a large number of glass fibers (light-guided linear material) and a required amount of quartz glass spheres (light-guided granular material) are mixed in an adhesive solution, and quartz glass is mixed. Keep the spheres sandwiched between the glass fibers, scoop up the glass fibers in the longitudinal direction, and maintain the state by applying a compressive force to the glass fiber bundle so that the silica glass spheres and adhesive liquid do not spill out. .
[0013]
In addition, the pretreatment step may be a method in which the glass fiber and the quartz glass sphere are first mixed and the adhesive liquid penetrates into the gap. In this method, first, glass fibers and quartz glass spheres are mixed in air. At that time, a method of lowering the humidity of the atmosphere and attaching the quartz glass sphere to the glass fiber by static electricity is useful. Then, gather the glass fibers in the same direction so that the quartz glass spheres do not fall out of the glass fiber, apply a compressive force to the bundle, and bring the adhesive liquid into contact with the lower part of the bundle. The phenomenon of penetrating into a mesh-like capillary tube formed with glass spheres is utilized. Alternatively, a method of stirring a glass fiber, a quartz glass sphere, and an adhesive liquid in a container may be used.
[0014]
As described above, the quartz glass sphere and the adhesive liquid can be contained in the bundle of glass fibers. It is desirable that the quartz glass sphere and the adhesive liquid are uniformly mixed with the glass fiber.
[0015]
Next, in the adhesive curing step, the glass fibers are relatively moved by applying an accelerating motion such as vibration or swing to the mixture of the glass fiber, the glass sphere, and the adhesive. This is a step of drying or curing the adhesive.
[0016]
By this adhesive curing process, a large number of quartz glass spheres adhering to each glass fiber are bonded to each glass fiber, while the quartz glass sphere bonded to any glass fiber and the glass fiber It is possible to prevent the quartz glass spheres from being bonded to other glass fibers adjacent to the glass glass.
[0017]
In this case, it is relatively easy to have a portion where the granular material (quartz glass sphere) is bonded in a plurality of stages after curing in the adhesive curing step. In particular, when the diameter of the granular material is made smaller than the diameter of the linear material, this can be done easily. This point has the following meaning.
[0018]
That is, when the diameter of the granular material is about the same level as the diameter of the linear material, it is extremely difficult to bond it to the linear material. However, for example, in a filter configured by bundling a large number of linear filter materials, there is a case where it is desired to secure a gap of a predetermined size or more between the linear filter materials. In such a case, it is necessary to adhere a granular material having a large diameter to the surface of the linear object in order to ensure the large gap. In such a case, instead of adhering large-diameter granules, the same effect can be obtained by laminating small-diameter granules in multiple stages, and the above means (adhesion curing step) is extremely useful. It is.
[0019]
In particular, when the diameter of the granular material is smaller than the diameter of the linear material, after the curing of the above-mentioned adhesive curing step, a part where the granular material is bonded in multiple stages is formed. The following actions are considered.
First, when the diameter of the granular material is at the same level as the linear material, even if the granular material is to be bonded to the linear material, the contact between the linear material and the granular material is point bonding, so there is no adhesive strength, The granular material easily falls and adhesion is extremely difficult.
[0020]
On the other hand, by making a plurality of small-diameter granular materials into a lump shape, the bonding area between the linear materials increases, the bonding strength increases, and bonding becomes possible. As a result, it becomes possible to bond a plurality of stages of granular objects, and when a linear object having a plurality of stages of bonded granular objects is bundled, a desired gap between the linear objects can be formed.
[0021]
In order to bond a plurality of small-diameter granular materials in a multistage manner, a large number of granular materials are interposed between a large number of linear materials, and a mixture in which an adhesive is present between the linear materials and the granular materials is formed. Thereby, these mixtures adhere together by the surface tension and capillary action of the adhesive.
[0022]
Since the mass of the linear object is very large compared to the mass of the granular material, the adhesive force required to maintain the adhesion is that the adhesion of the linear object is more granular when the amount of adhesion is small. Overwhelmingly bigger than that of things. By applying an acceleration motion such as swinging perpendicularly to the longitudinal direction of the linear object having a large adhesion force, the linear object and the granular material are subjected to compression and tension. At the same time, when the adhesive is dried by blowing hot air or the like, the amount of the adhesive is reduced and the adhesive force is reduced. If it does so, the bundle | flux of the linear thing through a granular material in between will be cut | disconnected between the granular materials between the linear objects of the strongest adhesive force required for adhesion maintenance.
[0023]
Furthermore, if the adhesive is dried by applying accelerated motion such as swinging and blowing hot air, etc., the amount of adhesive decreases, and when separated, the particulate matter remaining on the surface of the linear object has a lattice structure. Thus, only a lump formed with a structure having strong adhesion remains. Further, when the adhesive is dried and the adhesiveness is increased with the increase in viscosity, the granular material adhering to the lump is bonded to the surface of the linear object.
[0024]
Since the wire has a thin wire diameter, it is vulnerable to local loads, impacts (bending) and twists in the direction perpendicular to the longitudinal direction. In order to prevent this, put linear objects and granular objects in a rectangular parallelepiped container, limit the degree of freedom of the linear objects only in the direction perpendicular to the longitudinal direction, and accelerate such as swinging in the direction perpendicular to the longitudinal direction. By performing the movement, it is possible to realize adhesion without bending of the linear object.
[0025]
To increase the number of overlapping layers of granular materials, increase the amount of granular material interposed between linear materials, and to reduce the number of overlapping steps, reduce the amount of granular materials between linear materials, and Increase the amount of movement (swing width, speed, number of times, etc.).
The conditions of oscillation, drying conditions (hot air temperature, air volume, time, etc.), etc. can be easily decomposed into parameters, and these parameters can be mechanized to easily create reproducible conditions. As a result, it has become possible to produce a large number of small-diameter granular materials bonded in a linear manner.
[0026]
DETAILED DESCRIPTION OF THE INVENTION
Example 1
  FIG. 1 shows a first embodiment according to the present invention.Used for photocatalytic filtersIt is explanatory drawing of the manufacturing method of a photocatalyst filter raw material. Hereinafter, the manufacturing method of the photocatalyst filter material according to Example 1 will be described with reference to FIG. 1, and the photocatalyst filter material manufacturing method, photocatalyst filter, and photocatalyst filter device according to Example 1 will be described.
[0027]
The manufacturing method of the photocatalyst filter by Example 1 consists of (1) pre-processing process, (2) adhesive agent hardening process, and (3) photocatalyst filter formation process. Hereinafter, each of these steps will be described in detail.
[0028]
(1) Pretreatment process
This pretreatment step is a step of forming a mixture in which a large number of glass spheres are interposed between a large number of glass fibers and an adhesive is present between the glass fibers. As shown in FIG. 1, first, 6000 glass fibers 1 made of quartz having a diameter of 125 μm and a length of 260 mm (or a product name “PFG1 glass fiber” manufactured by HOYA Corporation) are prepared as linear bodies. The glass fibers 1 are all placed in a suitable container 2 (for example, trade name “Natural Pack N-10” manufactured by Nishiyama Chemical Co., Ltd., dimensions 80 × 60 × 280 mm) with the longitudinal direction aligned. Next, 40 g of quartz glass spheres (trade name “SSV-43” manufactured by Tatsumori Co., Ltd.) having an average particle diameter of 50 μm are prepared as granular materials and placed in the container 2.
[0029]
Next, 40 ml (milliliter) of the adhesive liquid 4 (trade name “FJ-803” manufactured by Joban Electric Co., Ltd.) is put into the container 2 containing the glass fiber 1 and the glass bulb 3 and the lid is closed. Then, the mixture is stirred by reciprocating motion (stroke 80 mm, 5 reciprocations / second) to form a mixture composed of the glass fiber 2, the quartz glass sphere 3 and the adhesive liquid 4.
[0030]
(2) Adhesive curing process
The mixture of the glass fiber 1, the quartz glass bulb 3 and the adhesive liquid 4 is stored in a drying container 5 (size: 200 × 80 × 300 mm) with a cotton cloth 5a on the bottom, and the cotton cloth 5b is also applied on the upper side to cover the mixture. .
[0031]
Next, the drying container 5 is rocked or vibrated. This oscillation or vibration is a reciprocating motion with a stroke of 100 mm and 4 reciprocations / second so that the glass fiber 1 is accelerated in the longitudinal direction. At the same time, hot air (80 ° C.) is blown to dry the adhesive liquid 4. Thereby, only the quartz glass sphere 3 is bonded to the surface of each glass fiber 1 without bonding the glass fibers 1 to each other. Swing and hot air blowing are performed for about 10 minutes until the adhesive liquid 4 is completely dried.
[0032]
Once bonded, the glass fiber 1 with the quartz glass sphere 3 bonded to the surface is taken out of the container 5 and subjected to heat treatment (300 ° C., 2 hours) in the heating furnace 6 in order to further increase the adhesion. Thereby, a filter material for a photocatalyst in which a large number of quartz glass spheres are bonded to the surface of the glass fiber 1 is obtained. As shown in FIG. 2, this filter material is bonded and fixed in an island shape with an adhesive 4 in a state where the quartz glass spheres 3 are overlapped on the surface of the glass fiber 1 in a plurality of stages. Many are formed on the surface of the glass fiber 1.
[0033]
FIG. 3 is a diagram showing an overlapping mode of the quartz glass spheres 3. As shown in FIG. 3, the upper quartz glass spheres 3 are superimposed on the lower stage (base), that is, the plurality of quartz glass spheres 3 on the glass fiber 1 side. In this case, FIG. 3A shows a case where there are three lower stages and one upper stage, FIG. 3B shows a case where there are four lower stages and one upper stage, and FIG. 3C shows four lower stages. When there are two upper stages, FIG. 3D shows an example in which there are five lower stages and two upper stages.
[0034]
In Example 1, the lower quartz glass sphere covers about 60% of the total surface area of the glass fiber 1, and the upper quartz glass sphere 3 covers about 20%. In this way, when the quartz glass spheres 3 stacked in a plurality of stages serve as a base, and a photocatalytic filter is manufactured by bundling a large number of photocatalytic filter materials having a photocatalyst formed on the surface thereof, a photocatalyst having a space ratio of 60% is produced. A filter can be configured.
[0035]
(3) Photocatalyst filter formation process
Next, a photocatalyst is formed on the surface of the photocatalyst filter material obtained by the adhesive curing step. As this photocatalyst, a titanium dioxide photocatalyst film is formed by a dip method or the like. This dipping method is a method in which a predetermined photocatalytic film is formed on the surface of a material by putting the filter material in a liquid that can be coated with a photocatalyst and pulling it up at a predetermined speed (see, for example, JP-A-2000-5691). . Alternatively, a so-called blow-away method (see Japanese Patent Application Laid-Open No. 2000-5691) in which excess liquid is removed with a predetermined air flow after the filter material is placed in a liquid that can be coated with a photocatalyst may be used. . FIG. 4 is a view showing a photocatalyst filter material having a photocatalyst coated on the surface. As shown in FIG. 4, the photocatalyst 7 is formed on the surface of the quartz glass sphere 3 bonded and fixed in an island shape by the adhesive 4 and the surface of the glass fiber 1 to which the quartz glass sphere 3 is not bonded. .
[0036]
Next, a filter bundle is formed by bundling a large number of photocatalyst filter materials on which a photocatalyst is formed. This filter bundle is installed in an appropriate filter case, and a fluid to be treated is introduced from one end face of the filter bundle, and contaminants contained in the fluid to be treated are removed from the surface of each filter material (that is, the surface of the photocatalyst 7). At the same time, light is introduced into each photocatalytic filter material so that the captured contaminants can be decomposed by the photocatalytic action to complete the photocatalytic filter.
[0037]
FIG. 5 is a diagram showing a configuration of a photocatalytic filter device 100 using the above-described photocatalytic filter. As shown in FIG. 5, the photocatalyst filter device 100 has a filter bundle 10 formed by bundling a large number (in this example: 6000) of photocatalyst filter materials on which a photocatalyst film is formed accommodated in a cylindrical filter case body 11. Has been. Flange portions 12 and 13 are formed on both sides of the filter case main body 11. A fluid introduction port 12 a is provided on the side of the flange portion 12, and incident light L is incident on the front portion of the flange portion 12.₀Is provided with a glass window 12b. A fluid discharge port 13 a is provided on the side of the flange portion 13. When processing the fluid to be processed, the light L passes through the glass window 12b.₀The fluid to be treated is introduced from the fluid introduction port 12 a and is circulated through the gap in the filter bundle 10.
[0038]
In the filter bundle 10, the quartz glass sphere 3 in which the glass fibers 1 are stacked and fixed in a plurality of stages is used as a base material, and a photocatalytic filter having a space ratio of 60% is obtained as described above. Secure a gap. FIG. 6 is an explanatory view of the effect of securing the gap by the quartz glass sphere 3. As shown in FIG. 6 (a), when two clusters of quartz glass spheres are adjacent to ensure a gap, or as shown in FIG. 6 (b), two-stage quartz glass spheres 3 are stacked. There is a case where a lump of quartz glass spheres exists between the lumps to secure a gap.
[0039]
According to Example 1 described above, the quartz glass spheres stacked in a plurality of stages are formed in an island shape by a very simple process of shaking and drying the mixture of the glass fiber, the quartz glass sphere, and the adhesive. In addition, since the glass fiber surface is bonded and fixed, a relatively large amount of quartz glass spheres (average particle diameter of 50 μm) can be simultaneously bonded to a large number of glass fibers. And since there is little possibility that a strong force will be added to glass fiber etc., there is no possibility of damaging glass fiber etc., and a photocatalyst filter can be manufactured with a sufficient yield.
[0040]
In Example 1 described above, an example in which the linear object is a glass fiber and the granular object is a quartz glass sphere has been described. However, as the linear object, for example, a plastic fiber, a wire, Examples of the granular material include plastic spheres, spherical silica gel, glass spheres, and hollow glass spheres.
[0041]
Furthermore, in Example 1 described above, an example in which the adhesion step and the photocatalytic step are separately provided has been described. However, if an adhesive having a photocatalytic effect is used, the number of steps can be reduced to one.
[0042]
(Example 2)
  FIG. 7 shows a second embodiment of the present invention.Used for photocatalytic filtersIt is explanatory drawing of the manufacturing method of a filter raw material. Hereinafter, referring to FIG.,A method for producing a photocatalytic filter material according to Example 2 will be described. Since Example 2 has the same configuration as that of Example 1 except that only the drum-shaped container 8 is used in the pretreatment process and the adhesive curing process, Example 1 will be described below. Differences from the above will be described.
[0043]
In FIG. 7, glass fiber 1 (600 pieces), quartz glass bulb 3 (50 g), and adhesive liquid 4 (40 ml) are put in a drum-like container 8 (diameter 210 mm, length 300 mm) installed horizontally. Since the capacity of the drum-shaped container 8 is extremely large compared to the total volume of the mixture of the glass fiber 1 (600 pieces), the quartz glass sphere 3 (50 g) and the adhesive liquid 4 (40 ml), these mixtures are The drum-shaped container 8 is accommodated so as to almost stick to the bottom.
[0044]
Next, the drum-shaped container 8 is placed on the rotation rollers 8a and 8a and is rotated (rotation speed is about 60 times / minute). Here, a scraping bar 8b fixed to the outside by a fixing mechanism (not shown) is installed on the inner peripheral surface near the upper portion of the drum-shaped container 8.
[0045]
Accordingly, the mixture that sticks to the bottom and tries to rise to the top by the rotation of the drum-shaped container 8 is blocked by the scraping bar 8b and returned to the bottom. As a result, good agitation is performed, and an acceleration motion corresponding to rocking or vibration is applied to the glass fibers 1 to give an appropriate relative motion.
[0046]
Next, while rotating the drum-shaped container 8, hot air is blown into the drum-shaped container 8 for about 20 minutes using the blower 9 or the like, and the adhesive 4 is dried and cured. In this way, when the quartz glass sphere 3 is bonded to the surface, the glass fiber 1 is taken out from the container 5 and further heated by the heating furnace 6 in the same manner as in Example 1 (300 ° C., 2 hours). Thereby, a filter material for a photocatalyst in which a large number of quartz glass spheres are bonded to the surface of the glass fiber 1 is obtained.
[0047]
According to the second embodiment, it is possible to make the process simpler than in the first embodiment, and it is possible to manufacture a filter material for a photocatalyst more quickly and in a large amount. .
[0048]
  Next, Example 1 described aboveUsed forA photocatalyst filter device 100 (see FIG. 5) was configured using the filter bundle 10 manufactured by the photocatalyst filter material manufacturing method, and the performance test was performed. FIG. 8 is a configuration diagram of a system for performing a performance test of the photocatalytic filter device. As shown in FIG. 8, the gas to be decomposed is diluted with pure air to produce a predetermined concentration gas. Each cylinder was mixed with a mass flow controller at a constant flow rate through a gas mixer. The gas was temporarily stored in a buffer tank and sent to a cylindrical photocatalytic filter. For connection, a stainless steel pipe and a Teflon (registered trademark) tube were used in combination. The gas concentration was detected before and after the photocatalytic filter device 100, respectively. The detector used was gas chromatography (hereinafter referred to as “GC”). UV intensity is 10mW / cm² ,The flow rate was fixed at 1 liter / min.
[0049]
The results of examining the ability to remove components contained in the air using the above test system will be described below.
FIG. 9 is a graph showing the inlet-side concentration and the outlet-side concentration when a gas of acetaldehyde of 20 ppm is passed through the photocatalytic filter device 100 of the present invention. As shown in FIG. 9, about 20 ppm of gas on the inlet side had a residence time of 2.7 seconds, and the concentration on the outlet side decreased to below the GC detection limit (0.08 ppm). It was also removed continuously for 500 minutes. The acetaldehyde in the gas containing 20 ppm of acetaldehyde was removed all at once until the concentration became 1/100 or less.
[0050]
FIG. 10 is a graph showing the inlet side concentration and the outlet side concentration of the photocatalytic filter device 100 when the concentration of acetaldehyde is set to 70 ppm in order to investigate the quantum efficiency.
When the concentration on the inlet side is low at the initial stage, it indicates that measurement is started from the beginning of gas mixing. Even at this 70 ppm, it decreased to 0.08 ppm or less in one pass. Assuming that acetaldehyde decomposes in a one-electron reaction, the quantum efficiency was indeed 50%.
[0051]
FIG. 11 is a graph showing the inlet side concentration and the outlet side concentration when 20 ppm of trichlorethylene gas is passed through the photocatalytic filter device 100. 20 ppm is a concentration about 1,000 times the environmental regulation value of 34 ppb. About 20 ppm of gas on the inlet side had a residence time of 2.7 seconds, and the concentration on the outlet side decreased to a detection limit of 0.08 ppm or less, like acetaldehyde. Trichloroethylene in the 20 ppm trichlorethylene gas was removed until the concentration became 1/100 or less at a stroke. This was also removed continuously for 500 minutes. From the standpoint of filter life, this is equivalent to having been confirmed to have 500,000 minutes (about 140 days).
[0052]
Trichlorethylene is one of four hazardous air pollutants. In addition, trichlorethylene may generate toxic substances such as phosgene by oxidative decomposition from the structural formula. Therefore, a precise analysis by TENAX was performed for the above-mentioned outlet side concentration of 0.08 ppm or less. As a result, it was confirmed that trichlorethylene was removed to 0.2 ppb or less.
[0053]
FIG. 12 is a graph showing the inlet side concentration and the outlet side concentration when 1 ppm of benzene gas is passed through the photocatalytic filter device 100. 1 ppm is about 1,000 times the environmental regulation value of 0.9 ppb. About 1 ppm of gas on the inlet side decreased to 0.2 ppm on the outlet side after a residence time of 2.7 seconds. The measurement was performed under the same conditions as the acetaldehyde and trichlorethylene, such as the light amount and the residence time, but 100% decomposition was not achieved. I would like to clarify in the future whether this is because benzene is a stable substance that is difficult to decompose or because it has a large number of electrons used for decomposition. However, 80% degradation continues for 16 days. Two things can be considered from this. One is that the benzene filter in the environment has a lifetime of 16,000 days (about 43 years) or more, or the performance of removal rate is maintained. The other is that, considering the adsorption characteristics of benzene itself, benzene accumulates on the photocatalyst, and the breakthrough phenomenon that occurs in the adsorption filter in the future does not occur in the present photocatalytic filter device. And it is thought that it shows that the breakthrough phenomenon due to the accumulation of decomposition products will not occur.
[0054]
  Benzene, like trichlorethylene, is one of four hazardous air pollutants. It is also known as a very carcinogenic substance. Therefore, a removal rate of about 80% is not sufficient. The analysis of the remaining amount of benzene and decomposition products at 100% removal rate was performed with slight changes. Conditions are 20mW, double the UV intensity/cm² InThe residence time was doubled to 5.4 seconds. The result is shown in FIG. The concentration of 1 ppm of benzene at the inlet side decreased to below the detection limit of GC in one pass. In order to examine whether it was completely decomposed, the concentration on the outlet side was analyzed by TENAX. Benzene was removed to 0.2 ppb or less below the TENAX detection limit. No decomposition products were detected.
[0055]
【The invention's effect】
  As detailed above,According to the photocatalytic filter and the photocatalytic filter device according to the present invention, it is possible to easily obtain a high-performance photocatalytic filter and a photocatalytic filter device.
[Brief description of the drawings]
FIG. 1 shows the first embodiment.Used for photocatalytic filtersIt is explanatory drawing of the manufacturing method of a photocatalyst filter raw material.
FIG. 2 shows the first embodiment.Used for photocatalytic filtersIt is a figure which shows a photocatalyst filter raw material.
FIG. 3 shows the first embodiment.Used for photocatalytic filtersIt is a figure which shows the aspect of the overlap of the quartz glass bulb | ball 3. FIG.
FIG. 4 is a view showing a photocatalyst filter material of Example 1 in which a photocatalyst is applied and formed on the surface.
5 is a diagram showing a configuration of the photocatalytic filter device 100. FIG.
FIG. 6 is an explanatory view of an operation of securing a gap by a quartz glass sphere.
FIG. 7 shows the second embodiment.Used in such photocatalytic filtersIt is explanatory drawing of the manufacturing method of a photocatalyst filter raw material.
FIG. 8 is a configuration diagram of a system for performing a performance test of the photocatalytic filter device.
FIG. 9 is a graph showing the inlet side concentration and the outlet side concentration of the filter device when a gas of acetaldehyde of 20 ppm is passed through the photocatalytic filter device.
FIG. 10 is a graph showing the inlet side concentration and the outlet side concentration when the concentration of acetaldehyde is up to 70 ppm in order to investigate the quantum efficiency.
FIG. 11 is a graph showing the inlet side concentration and the outlet side concentration when 20 ppm of trichlorethylene gas is passed through the photocatalytic filter device.
FIG. 12 is a graph showing the inlet side concentration and the outlet side concentration when 1 ppm of benzene gas is passed through the photocatalytic filter device.
FIG. 13 is a graph showing an inlet side concentration and an outlet side concentration when 1 ppm of benzene gas is passed through a photocatalytic filter device.

Claims (3)

By adhering a large number of granular materials to the surface of a linear object and bundling a large number of photocatalyst filter materials having a photocatalyst formed on the surface, a filter bundle having gaps between the photocatalyst filter materials is formed and processed. A fluid is introduced from one end face of the filter bundle to capture contaminants contained in the fluid to be treated on the surface of each filter material, and light is introduced into each photocatalyst filter material to capture the captured contaminants. A photocatalytic filter that decomposes by photocatalysis,
The granulate, and characterized by the diameter of the smaller than the diameter of the linear material, and those which are bonded are stacked in a plurality of stages in an island shape on the surface of the linear material Photocatalytic filter to be used. The photocatalytic filter according to claim 1, wherein the linear object is a glass fiber, and the granular object is a glass sphere. A photocatalyst filter, a filter case main body for housing the photocatalytic filter, and flange portions provided on both sides of the filter case main body, and the inlet of the fluid to be treated at a side portion of the flange portion on the one side And a glass window for allowing light to enter the photocatalytic filter at a front portion of the flange portion on the one side. As well as
A photocatalytic filter device using the photocatalytic filter according to claim 1 or 2 as the photocatalytic filter.

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