JP2002191682A - Air cleaner and air cleaning filter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve a problem when a sulfur gas is treated with a filter using a photocatalyst that the gas oxidized by the reaction of the photocatalyst remains on the surface of the photocatalyst as a sulfate and works as a catalyst poison to deteriorate the photocatalyst. SOLUTION: The air cleaner has an adsorbent 2 for adsorbing at least a sulfur gas and the photocatalyst 3. The adsorbent 2 for adsorbing a sulfur gas is disposed on the upstream side, and the photocatalyst 3 is disposed on the downstream side of the air cleaner. By removing the sulfur gas by the adsorbent 2 for adsorbing a sulfur gas, the deterioration of the photocatalyst by contact of the surface of the photocatalyst 3 with the sulfur gas working as a catalyst poison, can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a toilet, a pet,
The present invention relates to an air purification device and an air purification filter for removing odors such as tobacco, cooking, and body odor.

[0002]

2. Description of the Related Art As an air purifying device, a device that uses a purifying filter having an adsorbent such as activated carbon and removes odorous substances by adsorption is generally used. Further, using the purifying filter in combination with adsorbent and a photocatalyst, in addition to the adsorption and removal using an adsorbent, by photocatalyst to oxidize and decompose odorous substances, it has been used as to remove odor material.

[0003]

However, when a sulfur-based gas is treated with a filter using a photocatalyst, the gas oxidized by the photocatalytic reaction remains on the surface of the photocatalyst as sulfate and acts as a catalyst poison to form the photocatalyst. There was a problem of deterioration.

Further, in the conventional air purifier, although alkaline gases such as ammonia and acidic gases such as acetic acid can be removed, they are included in the excretion odor of pets and the odor of nursing care (odors when changing diapers and processing excrement). The adsorption performance of sulfur-based gas is inferior, and the threshold value of sulfur-based gas is considerably lower than that of ammonia and other gases.
There was also a problem that the smell could not be sensed.

An object of the present invention is to solve the above-mentioned conventional problems, and an object of the present invention is to provide an air purifying apparatus capable of improving a sulfur-based gas removing performance and preventing deterioration of a photocatalyst.

[0006]

SUMMARY OF THE INVENTION In order to solve the above-mentioned conventional problems, an air purifying apparatus of the present invention has an adsorbent for selectively adsorbing a sulfur-based gas and a photocatalyst. By removing the sulfur-based gas with the adsorbent that adsorbs specifically, it is possible to prevent the sulfur-based gas from contacting the photocatalyst surface, acting as a catalyst poison, and deteriorating.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION
A purifying section for purifying the contaminated air, an air purifying apparatus main body accommodating the purifying section, wherein the air purifying apparatus main body has an air inlet for introducing the contaminated air into the purifying section, and air purified by the purifying section. And an outlet for discharging, wherein the purifying section comprises:
An air purifier that has at least an adsorbent that adsorbs sulfur-based gas on the upstream side and a photocatalyst on the downstream side.The sulfur-based gas contained in the contaminated air is removed before the sulfur-based gas comes into contact with the photocatalyst surface. By removing the sulfur-based gas with the adsorbent to be adsorbed, it is possible to prevent the sulfur-based gas from contacting the photocatalyst surface, acting as a catalyst poison, and deteriorating. Further, since the ability to adsorb a sulfur-based gas having a low threshold value is increased, the removal effect can be realized. Further, gases other than the sulfur-based gas can be removed by oxidative decomposition using a photocatalyst.

According to a second aspect of the present invention, in particular, the purifying section according to the first aspect is constituted by a filter in which both an adsorbent for adsorbing at least a sulfur-based gas and a photocatalyst are mixed. By providing an adsorbent for adsorbing a sulfur-based gas and a photocatalyst in the same filter, the size of the purifying unit can be reduced.

According to a third aspect of the present invention, in particular, the purifying section according to the first aspect comprises a filter having an adsorbent for adsorbing at least a sulfur-based gas and a filter having a photocatalyst. Can be prevented from being deteriorated by poisoning, and a filter for the adsorbent and a filter for the photocatalyst can be separately manufactured, so that the filter can be easily manufactured.

According to a fourth aspect of the present invention, in particular, the filter according to the second aspect is an air purifying device in which an adsorbent is present more upstream than the photocatalyst, and a sulfur-based gas is present on the surface of the photocatalyst. By adsorbing with a sulfur-based gas adsorbent before contact, it is possible to prevent the sulfur-based gas from acting as a catalyst poison and deteriorating. Further, since the ability to adsorb a sulfur-based gas having a low threshold value is increased, the removal effect can be realized. Furthermore, gases other than sulfur-based gases are
It can be removed by oxidative decomposition using a photocatalyst.

The invention according to claim 5 of the present invention is particularly advantageous in that the adsorbent according to any one of claims 1 to 4 has at least one of zeolite, activated carbon and silica gel added to the adsorbent. the large adsorbent surface area,
Gas adsorption can be performed efficiently.

According to a sixth aspect of the present invention, the base material of the filter according to any one of the second to fourth aspects is a honeycomb structure, and the honeycomb structure carries an adsorbent or a photocatalyst. To configure the filter. Therefore, the resistance due to ventilation can be kept low, and the deodorizing efficiency can be improved by increasing the contact area. In addition, it has good light transmittance and is useful when irradiating a photocatalyst with ultraviolet rays.

[0013] The invention according to claim 7 of the present invention is characterized in that the base material of the filter according to any one of claims 2 to 4 is a foam, and the foam supports an adsorbent or a photocatalyst. Configure filters. As in the case of the honeycomb structure, the resistance due to ventilation is kept low, and the contact area can be widened, so that the deodorizing efficiency can be improved.

The invention according to claim 8 of the present invention is characterized in that the base material of the filter according to any one of claims 2 to 4 is a woven or non-woven fabric made of a fibrous material, and the fibers have an adsorbent or an adsorbent. A filter is configured to carry a photocatalyst. Since it is excellent in flexibility and workability, it can be used in a curved state or processed into a pleated shape.

The invention according to claim 9 of the present invention particularly provides
The photocatalyst of the invention according to any one of claims 1 to 8, comprising at least one of titanium oxide, zinc oxide, tungsten oxide and iron oxide, causes a photocatalytic reaction by irradiation with ultraviolet rays, and oxidatively decomposes gaseous substances. can do.

According to a tenth aspect of the present invention, the adsorbent for selectively adsorbing a sulfur-based gas according to any one of the first to ninth aspects is manganese, copper, cobalt, zinc,
It is composed of a metal oxide or a composite oxide containing at least one of iron and nickel, and the sulfur-based gas can be efficiently removed by chemical adsorption having a stronger adsorption force than physical adsorption by intermolecular force.

The eleventh aspect of the present invention comprises a filter in which at least an adsorbent for adsorbing a sulfur-based gas and a photocatalyst are mixed, and the sulfur-based gas contained in the contaminated air is reduced. By removing the sulfur-based gas with an adsorbent that adsorbs the sulfur-based gas, it is possible to prevent the sulfur-based gas from contacting the photocatalyst surface, acting as a catalyst poison and deteriorating. Further, since the ability to adsorb a sulfur-based gas having a low threshold value is increased, the removal effect can be realized. Further, gases other than the sulfur-based gas can be removed by oxidative decomposition using a photocatalyst. Further, by providing the same filter with the adsorbent for adsorbing the sulfur-based gas and the photocatalyst, the size of the filter can be reduced.

The invention according to a twelfth aspect of the present invention comprises a filter having an adsorbent for adsorbing at least a sulfur-based gas and a filter having a photocatalyst, which can prevent deterioration of the photocatalyst due to poisoning. Since the filter for the adsorbent and the filter for the photocatalyst can be separately manufactured, the filter can be easily manufactured.

According to a thirteenth aspect of the present invention, the filter according to the eleventh aspect is an air purifying filter in which the distribution of the adsorbent and the photocatalyst is unevenly distributed with respect to the ventilation direction. When the sulfur-based gas is adsorbed by the sulfur-based gas adsorbent before the sulfur-based gas comes into contact with the photocatalyst surface from the adsorbent side to the photocatalyst side, it prevents the sulfur-based gas from acting as a catalyst poison and deteriorating be able to. Also,
For ability to adsorb low sulfur-based gas of the threshold is increased,
The removal effect can be felt. Further, gases other than the sulfur-based gas can be removed by oxidative decomposition using a photocatalyst.

The invention according to claim 14 of the present invention is characterized in that the adsorbent according to any one of claims 11 to 13 is
By adding at least one of zeolite, activated carbon, and silica gel, gas can be efficiently adsorbed by the adsorbent having a large specific surface area.

[0021] The invention according to claim 15 of the present invention, especially a substrate is a honeycomb structure of the filter of the invention according to any one of claims 11 to 14, carrying an adsorbent and a photocatalyst in the honeycomb structure To configure the filter. Therefore, the resistance due to ventilation can be kept low, and the deodorizing efficiency can be improved by increasing the contact area. In addition, it has good light transmittance and is useful when irradiating a photocatalyst with ultraviolet rays.

According to a sixteenth aspect of the present invention, in particular, the base material of the filter according to any one of the eleventh to fourteenth aspects is a foam, and the foam supports an adsorbent or a photocatalyst. Configure filters. As in the case of the honeycomb structure, the resistance due to ventilation is kept low, and the contact area can be widened, so that the deodorizing efficiency can be improved.

According to a seventeenth aspect of the present invention, the base material of the filter according to any one of the eleventh to fourteenth aspects is a woven or non-woven fabric made of a fibrous material. A filter is configured to carry a photocatalyst. Since it is excellent in flexibility and workability, it can be used in a curved state or processed into a pleated shape.

The invention according to claim 18 of the present invention is characterized in that the photocatalyst according to any one of claims 11 to 17 comprises at least one of titanium oxide, zinc oxide, tungsten oxide and iron oxide. it is, cause a photocatalytic reaction by irradiation of ultraviolet rays, can be oxidatively decomposed gaseous material.

According to a nineteenth aspect of the present invention, in particular, the adsorbent for selectively adsorbing the sulfur-based gas according to any one of the eleventh to eighteenth aspects is manganese, copper, cobalt, zinc, iron or nickel. And a metal oxide or composite oxide containing at least one of the above, and the sulfur-based gas can be efficiently removed by chemical adsorption having a stronger adsorption force than physical adsorption by intermolecular force.

[0026]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings.

(Embodiment 1) FIG. 1 is a sectional view showing a configuration of an air purifying apparatus according to a first embodiment of the present invention. Arrows represent airflow. Reference numeral 1 denotes a filter, which is a purifying unit for purifying contaminated air, and includes a sulfur-based gas adsorbent 2, a photocatalyst 3, and a base material 4 supporting the sulfur-based gas adsorbent 2 and the photocatalyst 3. In this embodiment, the base material 4 is 400 mL of a hydrophobic zeolite honeycomb body having 100 cells per square centimeter. The sulfur-based gas adsorbent 2 is a mixture of manganese oxide and copper oxide, and the photocatalyst 3 is titanium oxide. Reference numeral 5 denotes an air purification device main body, and reference numeral 6 denotes a contaminated air provided on a side wall of the air purification device main body 5 for purifying the air.
An outlet for introducing purified air from the air purifier main body 5; a blower means 8 for sucking contaminated air from the inlet 6; Is a black light that emits ultraviolet light to excite the photocatalyst 3 included in the purification unit 1.

The filter, which is the purifying section 1, carries a mixture of manganese oxide and copper oxide of the sulfur-based gas adsorbent 2 and titanium oxide of the photocatalyst 3 with colloidal silica as a binder on each side of the substrate 4. It was made by making it. As a supporting method, after immersing in a solution of manganese oxide and copper oxide and a solution of colloidal silica to about half the thickness of the substrate and drying, the other surface is coated with a solution of titanium oxide and colloidal silica as described above. Similarly, it was immersed to about half the thickness of the substrate 4 and dried.

Hereinafter, the operation of the air purifying apparatus thus configured will be described. When the fan 8 of the blowing means is operated, an airflow indicated by an arrow is generated, and the contaminated air taken in from the intake port 6 is purified by passing through the filter 1 which is a purifying unit. The filter 1 serving as a purifying unit is provided with the adsorbent 2 for adsorbing sulfur-based gas on the upstream side of the airflow from the inlet 6 to the outlet 7. The sulfur-based gas contained in the contaminated air is first adsorbed by a mixture of manganese oxide and copper oxide, which is the sulfur-based gas adsorbent 2. Other gases, the titanium oxide photocatalyst 3 excited by ultraviolet black light 10 is energized, is removed by oxidative decomposition. Thereafter, the air is exhausted from the outlet 7.

According to this embodiment, since the sulfur-based gas is previously adsorbed and removed by the sulfur-based gas adsorbent 2, the photocatalyst 3 can be prevented from being deteriorated due to poisoning.

In this embodiment, in order to sufficiently excite the titanium oxide, the intensity of the 360 nm ultraviolet light on the surface of the filter 1 on the side of the black light 10 is set to be about ² mW / cm ² . The same effect can be obtained by using a germicidal lamp or a cold cathode ultraviolet lamp. The air volume of the fan 8 of the blowing means was set at ³ m ³ / min.

In this embodiment, titanium oxide is used for the photocatalyst 2 in view of easiness of handling, cost, etc., but at least one of titanium oxide, zinc oxide, tungsten oxide and iron oxide is included. Similar effects can be obtained with a mixture or a composite oxide.

In this embodiment, a mixture of manganese oxide and copper oxide is used as a sulfur-based gas adsorbent. However, a metal oxide containing at least one of manganese, copper, cobalt, zinc, iron and nickel is used. And composite oxides have the same effect.

In this embodiment, the honeycomb structure is used as the base material 4. However, although a slight difference is seen in the ventilation resistance even with the foam, the same effect can be obtained in the deodorizing performance.

(Embodiment 2) FIG. 2 is a sectional view showing the structure of an air purifying apparatus according to a second embodiment of the present invention. The same parts as those in the first embodiment are denoted by the same reference numerals, and the description is omitted. The filter 1, which is a purifier, includes a sulfur-based gas adsorption filter 1a and a photocatalyst filter 1b. The substrate 4 was cut in half so that the thickness became almost equal. A mixture of manganese oxide and copper oxide or titanium oxide was supported by adding colloidal silica as a binder to each of the two substrates to obtain a sulfur-based gas adsorption filter 1a and a photocatalyst filter 1b.

Next, the deodorizing performance of this embodiment is described in Example 1,
An experiment performed in comparison with an air purification device equipped with a filter including only a photocatalyst will be described. Put the three air purifier in a 6 m ³ of the test box, hydrogen and ammonia concentration sulfide was prepared so as 20ppm respectively in the test box. The air volume of the fan 8 of the blowing means is 3 m
Set ³ / min, to measure the time course of the ammonia concentration in the box. The experimental results are shown in FIG. The filter using only the photocatalyst has poorer removal performance than the others, and the residual ammonia concentration is high. Further, as the operation time elapses, the removal performance deteriorates. This is presumably because coexisting hydrogen sulfide has an adverse effect as a catalyst poison, and oxidative decomposition has not been completely performed. In Examples 1 and 2, the removal performance was higher than that of the photocatalyst alone, and particularly in Example 2, the removal performance was hardly reduced. This is because in the air purifying apparatus of the second embodiment, the sulfur-based gas adsorbent 2 is more present on the upstream side than in the air purifying apparatus of the first embodiment. This is considered to be because the effect of preventing photocatalyst 3 from deteriorating is high. Further, since the photocatalyst filter is disposed on the black light 10 side, it is considered that the irradiation efficiency of the ultraviolet light is good, and as a result, the oxidative decomposition by the photocatalyst was performed efficiently.

(Embodiment 3) FIG. 3 is a sectional view showing the structure of an air purifying apparatus according to a third embodiment of the present invention. The same parts as those in the first and second embodiments are denoted by the same reference numerals, and the description is omitted. The support on the base material 4 is performed by immersing the base material 4 in a mixed solution obtained by adding a mixture of manganese oxide and copper oxide as the sulfur-based gas adsorbent 2 and titanium oxide as the photocatalyst 3 with colloidal silica as a binder, followed by drying. I did it in a way.

(Embodiment 4) FIG. 4 is a cross-sectional view of an air purification filter according to a fourth embodiment of the present invention, in which a polymer fiber 10 as a base material 4 has a sulfur-based gas adsorbent 2, a photocatalyst 3, and a zeolite 11 attached thereto. Is carried. The polymer fiber 10 was immersed in a solution of a mixture of manganese oxide and copper oxide as the sulfur-based gas adsorbent 2, titanium oxide as the photocatalyst 3, hydrophobic zeolite 11, and colloidal silica as a binder, and was supported by drying.

In this embodiment, polymer fibers are used as the base material 4. However, similar effects can be obtained with respect to deodorizing performance by using ceramic fibers and metal fibers.

Although a hydrophobic synthetic zeolite is used as an adsorbent for ammonia or the like, an adsorbent containing at least one of activated carbon, zeolite, silica and alumina exhibits the same effect.

[0041]

According to the air purification device of the present invention, sulfur-based gas is brought into contact with the surface of the photocatalyst to act as catalyst poisons, it is possible to prevent the deterioration.

[Brief description of the drawings]

FIG. 1 is a sectional view of an air purification device showing a first embodiment of the present invention.

FIG. 2 is a cross-sectional view of an air purification device showing a second embodiment of the present invention.

FIG. 3 is a cross-sectional view of an air purification device showing a third embodiment of the present invention.

FIG. 4 is a cross-sectional view of an air purification filter showing a fourth embodiment of the present invention.

FIG. 5 is a diagram showing a change over time in the removal rate of ammonia using the air purification device of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Purification part (filter) 2 Sulfur-based gas adsorbent 3 Photocatalyst 4 Base material 5 Air purification device main body 6 Intake port 7 Discharge port 8 Blowing means 9 Black light 10 Polymer fiber 11 Zeolite

Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (reference) B01D 53/86 B01J 20/20 D 4G069 B01J 20 / 20F 29/076 A 29/076 35/02 ZABJ 35/02 ZAB B01D 53/36 J (72) Inventor Yu Fukuda 1006 Kazuma Kadoma, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. Inventor Shuzo Tokuma 1006 Kazuma Kadoma, Kadoma City, Osaka Prefecture F-term in Matsushita Electric Industrial Co., Ltd. (Reference) BC05 BC07 CA01 4D048 AA22 AB01 AB03 BA07X BA16Y BA27Y BA36Y BB08 BC01 BC04 CA01 CD01 CD05 EA01 4G066 AA04B AA15B AA18B AA22B AA23B AA25B AA26B AA27B AA61B BA07 BA16 CA22 CA03 BA11A04 A0BA0 BC03 EA10

Claims (19)

[Claims] 1. A purifying section for purifying contaminated air, an air purifying apparatus main body accommodating the purifying section, an air inlet for introducing contaminated air into the purifying section,
And an outlet for discharging the air purified by the purifying unit,
The purifier is disposed an adsorbent for adsorbing at least a sulfur-based gas on the upstream side, an air purification device arranged photocatalyst downstream. 2. The air purifying apparatus according to claim 1, wherein the purifying section is constituted by a filter obtained by mixing at least an adsorbent for adsorbing at least a sulfur-based gas and a photocatalyst. 3. The air purifier according to claim 1, wherein the purifier comprises a filter having an adsorbent for adsorbing at least a sulfur-based gas and a filter having a photocatalyst. 4. The air purifying apparatus according to claim 2, wherein the filter has more adsorbent upstream than the photocatalyst. 5. The air purification device according to claim 1, wherein at least one of zeolite, activated carbon, and silica gel is added to the adsorbent. 6. The air purification device according to claim 2, wherein the base material of the filter is a honeycomb structure. 7. The filter according to claim 2, wherein the base material of the filter is a foam.
An air purification device according to any one of claims 1 to 4. 8. The air purification device according to claim 2, wherein the base material of the filter is a woven or non-woven fabric made of a fiber material. 9. The air purification device according to claim 1, wherein the photocatalyst is made of at least one of titanium oxide, zinc oxide, tungsten oxide, and iron oxide. 10. The air purification device according to claim 1, wherein the adsorbent is made of a metal oxide or a composite oxide containing at least one of manganese, copper, cobalt, zinc, iron and nickel. 11. An air purification filter comprising a filter obtained by mixing at least an adsorbent that adsorbs at least a sulfur-based gas and a photocatalyst. 12. A filter having an adsorbent to adsorb at least a sulfur-based gases, air purifying filter constituted from a filter having a photocatalyst. 13. The air purification filter according to claim 11, wherein the distribution of the adsorbent and the distribution of the photocatalyst are unevenly distributed in the ventilation direction. 14. The adsorbent according to claim 11, wherein at least one of zeolite, activated carbon and silica gel is added.
An air purification filter according to any one of the above. 15. The air purification filter according to claim 11, wherein the base material of the filter is a honeycomb structure. 16. The air purification filter according to claim 11, wherein the base material of the filter is a foam. 17. The air purification filter according to claim 11, wherein the base material of the filter is a woven or non-woven fabric made of a fiber material. 18. The air purification filter according to claim 11, wherein the photocatalyst comprises at least one of titanium oxide, zinc oxide, tungsten oxide, and iron oxide. 19. The air purification filter according to claim 11, wherein the adsorbent comprises a metal oxide or a composite oxide containing at least one of manganese, copper, cobalt, zinc, iron and nickel.