KR102297635B1 - Air purifier - Google Patents

Abstract

a deodorizing filter comprising a visible light active catalyst; and a white light emitting diode module; provides an air purifier comprising.

Description

Air purifier {AIR PURIFIER}

It's about air purifiers.

The need for air purifiers is increasing as indoor and air pollution has intensified. In addition, air purifier regulations (standards) are also increasing in line with increasing consumer demands.

Activated carbon, the main material of deodorizing filters provided in air purifiers, has a high specific surface area that appears through various pores with nano or micro sizes, and harmful gases (VOCs), heavy metals, bacteria, adsorbs viruses, etc. For this purpose, it is very important that the adsorbent has a high specific surface area. This is because the high specific surface area of an adsorbent has a close relationship with the saturated adsorption amount and adsorption rate of the adsorbent. In addition, it is possible to improve the adsorption property of the material to be removed by attaching a specific functional group to the surface of the adsorbent through surface treatment of the adsorbent.

However, since activated carbon is an adsorbent, when the adsorbable sites (pores) are saturated, the performance deteriorates rapidly, and in particular, it is difficult to adsorb an aldehyde-based gas. Therefore, a chemical adsorption type organic additive is introduced to remove aldehyde-based gas. In this case, it is difficult to implement the performance that can satisfy the regulation.

One embodiment of the present invention provides an air purifier with improved resolution of possible harmful effects, deodorization performance and durability.

In one embodiment of the present invention, a deodorizing filter comprising a visible light active catalyst; and a white light emitting diode module; provides an air purifier comprising.

The air purifier has improved possible harmful resolution, deodorization performance and durability.

1 is a cross-sectional view schematically showing an air purifier according to an embodiment of the present invention.
2 is a view schematically showing pellet-type activated carbon particles coated with the visible light-activated catalyst.
3 is a result of evaluating the deodorization performance with respect to Example 2 and Comparative Example 2.
4 is a result of evaluating the deodorization performance according to the illuminance of the white light emitting diode module with respect to Example 2.

Hereinafter, with reference to the accompanying drawings, the embodiments of the present invention will be described in detail so that those of ordinary skill in the art to which the present invention pertains can easily implement them. The present invention may be embodied in many different forms and is not limited to the embodiments described herein.

In order to clearly explain the present invention, parts irrelevant to the description are omitted, and the same reference numerals are given to the same or similar elements throughout the specification.

In order to clearly express various layers and regions in the drawings, the thicknesses are enlarged. And in the drawings, for convenience of description, the thickness of some layers and regions are exaggerated.

Hereinafter, the formation of an arbitrary configuration on the “top (or bottom)” or “top (or bottom)” of the substrate means that any configuration is formed in contact with the top (or bottom) surface of the substrate. However, it is not intended to limit the inclusion of other features between the substrate and any features formed on (or under) the substrate.

In one embodiment of the present invention, a deodorizing filter comprising a visible light active catalyst; And a white light emitting diode (white LED) module; provides an air purifier comprising a.

1 is a cross-sectional view schematically showing an air purifier 100 according to an embodiment of the present invention. The air purifier 100 includes a deodorizing filter 10; and a white light emitting diode module 20 .

The deodorizing filter 10 may further include activated carbon, and may include activated carbon and visible light-activated catalyst particles together.

Since the air purifier 100 includes a white light emitting diode module 20 that is a light source capable of irradiating light to the deodorizing filter 10 containing a visible light active catalyst, the visible light active catalyst is activated even in the absence of a natural light source. can do. The air purifier 100 manufactured in this way can improve durability, accumulated purification amount, initial removal efficiency, and the like of the filter as the deodorizing filter 10 is given the ability to decompose harmful gases.

The activated carbon 1 is a porous carbon material including micropores and has very high adsorption properties. The activated carbon 1 is a very effective deodorizing material in terms of price and performance. The activated carbon 1 can remove harmful gases through adsorbable sites (pores) as an adsorbent.

In order not to saturate the activated carbon, it can be regenerated by decomposing the harmful gas adsorbed by the visible light-activated catalyst particles. In addition, the activated carbon has excellent adsorption performance of acetic acid or toluene among the five major gases (formaldehyde, acetaldehyde, acetic acid, ammonia and toluene), but has poor adsorption properties for aldehyde series and ammonia, but the deodorization filter (10) can improve the removal performance of the aldehyde series and ammonia through the excellent decomposition performance of the visible light activated catalyst included with the activated carbon, especially the aldehyde series.

The deodorizing filter 10 may include activated carbon in various ways.

For example, the deodorizing filter 10 may include pellet-type activated carbon particles. The deodorizing filter 10 may be a structure including a space for accommodating the pellet-type activated carbon particles. Specifically, the deodorizing filter 10 may further include a ceramic honeycomb structure. The ceramic honeycomb structure is a structure formed in a honeycomb shape. The pellet-type activated carbon particles may be accommodated in the ceramic honeycomb structure. The ceramic honeycomb structure may include about 50 wt% to about 80 wt% of activated carbon.

When the deodorizing filter 10 accommodates pellet-type activated carbon particles, it may contain 200 g to 600 g of activated carbon particles. An air cleaner provided with a deodorizing filter (10) including activated carbon particles of the content can operate efficiently at about 20 m ³ to 40m ³ space.

For another example, the deodorizing filter 10 may include an activated carbon-containing fiber base in which activated carbon is distributed between the fibers or mixed in a manner.

For another example, the deodorizing filter 10 may include a corrugated activated carbon filter. In the deodorizing filter 10 including the corrugated activated carbon filter, the corrugated activated carbon filter may include, specifically, a corrugated paper structure of ceramic or nonwoven fabric. The paper structure may include a space for accommodating activated carbon and, optionally, adsorbent particles on the nonwoven fiber, or a form in which activated carbon and, optionally, an adsorbent is coated on the surface of the paper structure. When activated carbon is accommodated, it may be activated carbon (see FIG. 2 ) in which a visible light-activated catalyst is coated on the surface in the form of an island, as will be described later.

In the paper structure, the space for accommodating the activated carbon particles may be a closed space formed by the surface of the corrugated paper. Alternatively, activated carbon and, optionally, an adsorbent may be coated on the surface of the activated carbon-containing fiber base or the paper structure.

In the present specification, the fiber substrate and the paper structure are hereinafter referred to as "porous substrate".

For example, the fiber base or the porous base of the paper structure may include a material including at least one selected from the group consisting of organic or inorganic fiber woven or nonwoven fabrics, paper, and combinations thereof.

The porosity of the porous substrate may be about 50% to about 80%. The porous substrate having the porosity can maintain structural strength while supporting an appropriate amount of activated carbon.

The method of attaching, coating, or impregnating the activated carbon to the porous substrate may be performed according to a method known in the art, for example, immersing a porous substrate such as a fiber substrate or a paper structure in the activated carbon-containing composition. After drying, or spraying the activated carbon-containing composition onto the porous substrate by a spray method, it is not limited thereto.

The activated carbon-containing composition may use alcohol or water as a solvent, and may include a separate organic binder material to implement excellent adhesion and to be rapidly absorbed and dried. Accordingly, when the air purifier is operated, the activated carbon is not detached from the substrate by the flow of air, so that it is possible to implement a long-term air cleaning, deodorizing or antibacterial effect.

The activated carbon-containing porous substrate may include about 50% by weight to about 80% by weight of activated carbon. By including the content within the above range, the visible light active photocatalyst coating composition can be adhered to an excellent level while sufficiently adsorbing harmful substances in the air without excessively increasing the cost.

When the deodorizing filter 10 includes the porous substrate, and when accommodating activated carbon particles, 50 g to 200 g of activated carbon particles may be included. In addition, when the deodorizing filter 10 includes the porous substrate, when activated carbon is coated on the surface of the porous substrate, 50 g to 200 g of activated carbon may be included. An air cleaner provided with a deodorizing filter (10) including activated carbon particles of the content can operate efficiently at about 20 m ³ to 40m ³ space.

The adsorbent optionally included together with the activated carbon may include at least one selected from the group consisting of diatomaceous earth, zeolite, silica gel, starch, bentonite, alumina, and combinations thereof.

The thickness of the porous substrate such as the fiber substrate or the paper structure may be about 0.5mm to about 3.0mm. By having a thickness within the above range, the air cleaning, deodorizing or antibacterial effect can be exhibited at an excellent level without excessively increasing the thickness of the air purification filter.

The visible light active catalyst generates peroxide anions or hydroxy radicals by electrons and holes generated from energy obtained by absorbing light in the visible region, and they decompose and remove harmful substances to clean air, deodorize or antibacterial. can be done

The visible light active catalyst particles may include porous metal oxide particles and metal particles.

Since the visible light-activated catalyst can be activated not only by ultraviolet light but also by visible light, photocatalytic efficiency can be improved to a high level indoors without a separate light source supply device.

The visible light active catalyst may be formed by doping or supporting the metal particles into pores in the porous metal oxide particles, and the visible light active catalyst thus formed may have photoactivity for visible light.

As described above, since the visible light-activated catalyst contains metal particles having photoactivity with respect to visible light, it can have activity not only for ultraviolet light but also for visible light, and can absorb light over the entire visible light range.

As such, since the visible light-activated catalyst is active within the wavelength range of the visible light region, the visible light-activated catalyst can sufficiently generate electrons and holes by the light source inside the air purifier by the white light emitting diode module 20. , excellent photocatalytic efficiency can be realized.

The visible light active catalyst may include a porous metal oxide and metal particles supported on the porous metal oxide. The metal particles may be supported in the surface and pores of the porous metal oxide.

The porous metal oxide may be formed into spherical, plate-shaped, or needle-shaped particles as a carrier, for example, by a sol-gel method or a hydrothermal method.

For example, the metal particles may be supported on the porous metal oxide by a photo-deposition method, but is not limited thereto.

The porous metal oxide may include, for example, at least one selected from titanium oxide, tungsten oxide, zinc oxide, niobium oxide, and combinations thereof. Specifically, the porous metal oxide may be tungsten oxide, and the tungsten oxide has excellent visible light activation performance.

As the metal particles, for example, a metal that imparts activity to visible light may be used without limitation, and may include a transition metal, a noble metal, or both. That is, the metal particles may include at least one selected from the group consisting of transition metals, noble metals, oxides thereof, and combinations thereof.

Specifically, the metal particles include tungsten, chromium, vanadium, molybdenum, copper, iron, cobalt, manganese, nickel, platinum, gold, cerium, cadnium, zinc, magnesium, calcium, strontium, barium, radium, palladium, and these may include at least one selected from a combination of, and more specifically, include at least one selected from the group consisting of platinum, copper, gold, silver, zinc, palladium, and combinations thereof to realize excellent visible light activity performance.

In one embodiment, as the visible light active catalyst, the porous metal oxide may include tungsten oxide, and the metal particles may include platinum. The visible light active catalyst including tungsten oxide and platinum absorbs visible light at a higher level, thereby effectively improving photocatalytic efficiency for visible light.

The porous metal oxide particles and the metal particles are spherical particles, respectively, and the 'spherical particle' does not mean a particle having a mathematically perfect spherical shape. it means.

The porous metal oxide particles and the metal particles are spherical particles, respectively, and the visible light active catalyst has a shape in which spherical metal particles are deposited on the surface (outer surface) of the spherical metal oxide particles or the surface (inner surface) of the internal pores. can have

The metal particles may have a particle diameter of several nanometers (nm), for example, about 3 nm to about 5 nm. The particle diameter of the metal particles is very small compared to the particle diameter of the metal oxide, and as the metal particles have a particle diameter in the above range, they are photo-deposited in an appropriate amount on the surface of the porous metal oxide particles to exhibit excellent photocatalytic activity. .

Depending on the shape of the porous metal oxide particles, the visible light active catalyst may be formed of particles.

The average particle diameter of the visible light active catalyst particles is about 1 μm or less, and specifically, may be about 0.4 μm to about 1 μm, for example, about 0.6 μm to about 0.7 μm. The average particle diameter of the visible light active catalyst particles may be obtained by measuring the visible light active catalyst 4wt% aqueous dispersion with a particle size analyzer.

When the particle size of the visible light active catalyst particles satisfies the above range, high adhesion to the surface of the porous substrate such as the activated carbon-containing fiber substrate or the paper structure can be secured, and an appropriate degree of dispersion on the surface of the porous substrate can be obtained. It can be uniformly dispersed while having and exhibit excellent photocatalytic activity. In addition, since the visible light active catalyst particles have a particle diameter within the above range, an exposed area to visible light may be secured, thereby exhibiting sufficient air cleaning and antibacterial functions.

In addition, for example, the visible light active catalyst particles may be evenly distributed between the pores in the porous substrate by having a particle diameter in the above range.

Considering that the particle size of the metal particles is much smaller than that of the metal oxide, the size of the visible light active catalyst particles, that is, the particle size of the visible light active catalyst particles, is mainly determined by the particle size of the porous metal oxide particles. can be understood That is, when the particles of the visible light active catalyst have a particle diameter in the above range, the porous metal oxide particles among the visible light active catalyst particles are several nanometers (nm) in the range, for example, an error of about 3 nm to about 5 nm. It may have a particle size within the range. In this case, the amount of metal particles supported on the surface of the porous metal oxide particles may be sufficient, and excellent catalytic activity efficiency may be exhibited.

In one embodiment, the visible light active catalyst may include 100 parts by weight of the porous metal oxide particles and 0.1 to 10 parts by weight of the metal particles, specifically 0.1 to 5 parts by weight. By controlling their content in a weight ratio within the above range, the porous metal oxide particles sufficiently generate electrons and holes by visible light while sufficiently preventing recombination of electrons and holes generated by the metal particles to effectively improve photocatalytic activity efficiency. can

When the content of the porous metal oxide particles exceeds the content range, electrons and holes generated by visible light can easily recombine, and it is difficult to separate them, so that sufficient photocatalytic activity is not exhibited. Since the number of electrons transferred from the porous metal oxide particles is not sufficiently secured, there is a fear that the photocatalytic activity may be lowered, and the photocatalytic performance may be deteriorated due to a decrease in the area exposed to light of the porous metal oxide particles.

In addition, some of the porous metal oxide particles may agglomerate with each other to form one cluster, and may be included as the cluster.

The specific surface area of the porous metal oxide may be about 50 m 2 /g to about 500 m 2 /g. By having a high level of specific surface area within the above range, the metal particles can be sufficiently supported by forming a porosity at an appropriate level while being effectively exposed to a light source such as visible light.

The deodorizing filter 10 may include the visible light active catalyst in various ways.

For example, the visible light-activated catalyst may be coated on the surface of the pellet-type activated carbon particles in the form of an island.

Figure 2 is a view schematically showing the particle body of the activated carbon (1) in the form of pellets coated with the visible light-activated catalyst (2), the particle body includes the activated carbon (1) and the visible light-activated catalyst (2) particles . Since the particle size of the visible light-activated catalyst (2) is smaller than that of the activated carbon (1), a plurality of particles of the visible light-activated catalyst (2) may be attached to the surface of the activated carbon (1).

The deodorizing filter 10 comprising the activated carbon 1 particle body in which the visible light active catalyst 2 particles are coated on the surface in the form of an island, the activated carbon 1 covered by the coating of the visible light activated catalyst 2 The adsorption sites (pores) of the carbon dioxide are almost insignificant, and although the effect thereof is insignificant, the decomposition performance that the activated carbon 1 does not have is imparted. For example, the specific surface area reduction of the activated carbon 1 by the coating of the visible light-activated catalyst 2 may be less than 10%.

In addition, the coating of the visible light active catalyst (2) is a system that does not contain an organic binder because it is used after preparing a coating composition in which water and the visible light active catalyst are mixed. In general, since high performance can be expected only when the surface of the photocatalyst is exposed, when an organic binder is used in the process of coating the substrate, the surface area is reduced by the organic binder, thereby reducing performance. Since the visible light activated catalyst 2 can be coated on the activated carbon 1 by using the affinity with moisture of the activated carbon 1 and the functional group on the surface of the activated carbon when the visible light activated catalyst 2 is coated, an organic binder is used. Because it is not used, high performance can be maintained and process costs and material costs can be minimized.

As shown in FIG. 2 , the particles of the activated carbon 1 of the pellet type coated with the visible light active catalyst 2 may be accommodated in a structure having an accommodation space and included in the deodorization filter 10 . For example, the particles of the pellet-type activated carbon 1 coated with the visible light active catalyst 2 may be accommodated in the ceramic honeycomb structure described above, or the activated carbon particles may be accommodated in the paper structure or coated on the surface. .

In another embodiment, the activated carbon-containing fiber base or the paper structure may be coated with the visible light active catalyst on the surface of the structure. Similarly, the coating of the visible light active catalyst may be prepared by preparing a coating composition in which water and the visible light active catalyst are mixed, and then applying it on the surface of the structure to prepare the deodorizing filter 10 .

The deodorizing filter 10 may include 2 to 10 parts by weight of a visible light active catalyst based on 100 parts by weight of activated carbon. The deodorizing filter 10 may exhibit excellent decomposition performance and excellent durability by including the visible light active catalyst in the content ratio range. When it is smaller than the above range, it is difficult to check the effect of the catalyst, and when it is larger than the above range, the pore inlet of the activated carbon is blocked to reduce adsorption performance or desorption of the catalyst may occur due to excessive coating.

The white light emitting diode module 20 may supply light to the deodorization filter 10 . That is, the white light emitting diode module 20 irradiates visible light to the deodorizing filter 10 to activate the visible light active catalyst. The visible light irradiated from the white light emitting diode module 20 may include visible light in a wavelength range of 380 nm to 780 nm.

The white light emitting diode module 20 may be a white light emitting diode (White LED), which is generally used for lighting at home, and is preferably manufactured in a form that does not interfere with the flow path of the air purifier as much as possible.

The white light emitting diode module 20 has the advantage of being easy to manufacture and low in price because it can be manufactured as a household LED that is harmless to the human body. The design of the white light emitting diode module 20 may be changed to a flat plate type or a circular shape depending on the shape of the filter.

The white light emitting diode module 20 is positioned with a predetermined separation distance from the deodorizing filter 10 .

In one embodiment, the distance between the white light emitting diode module 20 and the deodorizing filter 10 may be 1.5 cm to 15 cm. When the distance between the white light emitting diode module 20 and the deodorizing filter 10 is too close, the area to which light is not irradiated to the deodorizing filter 10 increases and the efficiency of the visible light active catalyst is lowered. As the illuminance of the irradiated light decreases, the efficiency is lowered. The air purifier 100 having the white light emitting diode module 20 and the deodorizing filter 10 formed to be spaced apart within the above range may exhibit an excellent air purification effect.

In addition, along with the separation distance, the air purifier 100 may further improve the air purification effect by adjusting the illuminance of the white light emitting diode module 20 within a predetermined range.

As the illuminance increases, heat generated by the white light emitting diode module 20 increases. When the temperature around the activated carbon increases due to the heat generated in this way, the physical adsorption capacity of the activated carbon decreases, so the removal performance is decreased. As a result, although higher illuminance is advantageous to increase the efficiency of the visible light-activated catalyst, the optimum illuminance exists due to deterioration in adsorption performance of activated carbon due to heat generated by the white light emitting diode module 20 .

In one embodiment, the white light emitting diode module 20 may emit light with an illuminance of 10,000 lux to 30,000 lux.

The air purifier 100 may further include commonly known components (not shown) constituting the air purifier. For example, the air purifier 100 may further include components such as a power supply means (not shown) and an outer case.

Hereinafter, Examples and Comparative Examples of the present invention will be described. The following examples are only examples of the present invention, and the present invention is not limited to the following examples.

( Example )

Example One

A solution in which 2.5 wt% of tungsten oxide (WO _{3 ) particles were dispersed in 97.5 wt% of water was prepared.} At this time, the tungsten oxide (WO ₃ ) particles have a particle diameter of about 600 nm. A supporting raw material, which is an aqueous solution of chloroplatinic acid (H2PtCl6), was mixed with the tungsten oxide particle dispersion solution. Then, a primary photoreaction was performed by irradiating visible light energy of 400 nm to 700 nm for a predetermined time using a visible light irradiation device, and then blocking the visible light irradiation for about 2 minutes, adding methanol, and then adding the primary light Visible light active photocatalyst particles were prepared by supporting platinum particles on tungsten oxide particles by performing a secondary photoreaction by irradiating visible light energy for a certain time using the same irradiation device as in the reaction.

The visible light active catalyst (Pt-WO ₃ ) was dispersed in distilled water at 6 wt% to prepare a slurry. In the slurry, the Pt-WO ₃ and the pellet-type activated carbon (diameter 3 pie, length 0.5 cm) were mixed so that the weight ratio was 1:40, and then stirred at low speed for 1 hour. After the stirring was completed, the activated carbon coated on the surface of the visible light-activated catalyst Pt-WO ₃ in the shape of an island was filtered and dried at 80° C. for 24 hours to prepare pellet-type activated carbon on which the visible light-activated catalyst was supported.

A deodorizing filter was prepared by putting the pellet-type activated carbon on which the visible light-activated catalyst was supported in the accommodation space of the ceramic honeycomb structure. The deodorization filter was loaded in an amount of 200 g of pellet-type activated carbon (of which, 5 g of the visible light active catalyst) supported on 100 g of the ceramic honeycomb structure.

The deodorizing filter was installed 1.5 cm apart from the white light emitting diode module (LG Innotek, 3030) to manufacture an air purifier.

Example 2

_{A slurry was prepared by dispersing the visible light active catalyst (Pt-WO 3} ) prepared in the same manner as in Example 1 in distilled water at 6 wt%. The prepared slurry was coated on a corrugated activated carbon filter (Azumi, ME06WE, a filter in which an activated carbon-coated non-woven fabric material was colgated) by spraying to prepare a deodorizing filter. The deodorization filter was prepared by coating 4 g of a visible light active catalyst (Pt-WO _{3 ) on 100 g of a corrugated activated carbon filter.}

The deodorizing filter was installed 1.5 cm apart from the white light emitting diode module (LG Innotek, 3030) to manufacture an air purifier.

Example 3

In Example 1, an air purifier was manufactured in the same manner, except that the deodorizing filter set the separation distance of the white light emitting diode module to 0.5 cm.

Example 4

In Example 1, an air purifier was manufactured in the same manner, except that the deodorization filter set the separation distance of the white light emitting diode module to 1.0 cm.

Example 5

In Example 1, an air purifier was manufactured in the same manner, except that the deodorizing filter set the separation distance of the white light emitting diode module to 3.0 cm.

Example 6

In Example 1, an air purifier was manufactured in the same manner, except that the deodorization filter set the separation distance of the white light emitting diode module to 6.0 cm.

Example 7-11

The coating amount of the visible light active catalyst (Pt-WO ₃ ) contained 200 g of pellet-type activated carbon supporting the visible light active catalyst on 100 g of the ceramic honeycomb structure (of which 10 g of the visible light active catalyst was 10 g), as shown in Table 2 below, An air purifier was manufactured in the same manner as in Example 1, except that the separation distance was adjusted.

comparative example One

A commercially available pellet-type activated carbon filter (KURARAY activated carbon pellets, visible photocatalyst not included) was prepared.

By putting the pellet-type activated carbon in the receiving space of the ceramic honeycomb structure, a deodorizing filter was prepared. The deodorizing filter contained 200 g of the pellet-type activated carbon in 100 g of the ceramic honeycomb structure.

The deodorizing filter was installed 1.5 cm apart from the white light emitting diode module (LG Innotek, 3030) to manufacture an air purifier.

comparative example 2

A commercially available colgate-type activated carbon filter (Azumi, ME06WE, a filter in which an activated carbon-coated non-woven fabric material is collated) was prepared as a deodorizing filter.

The deodorizing filter was installed 1.5 cm apart from the white light emitting diode module (LG Innotek, 3030) to manufacture an air purifier.

evaluation

Experimental example One

Evaluation comparing the performance of Example 1-2, which is a filter to which a visible light active catalyst is applied, and Comparative Example 1-2, which is not applied with a visible light active catalyst, using the air purifier manufactured in Examples 1-2 and Comparative Example 1-2 was carried out.

In order to confirm the effect of improving the cumulative purification amount of the filter by the decomposition action of the visible light-activated catalyst, the GB/T test, which is the Chinese air purifier standard, was conducted.

The evaluation is to evaluate the purification performance for formaldehyde, and the air purification rate and accumulated purification amount per hour are evaluated. After evaluating the air purification rate per hour in the 30 lube chamber, excess formaldehyde is accumulated in the 3 lube chamber, and then the air purification rate per hour is evaluated again in the 30 lube chamber. At this time, the test is repeated until the air purification rate evaluated after accumulation becomes 50% or less of the initial air purification rate. When it becomes less than 50%, the evaluation is terminated, and the cumulative purification amount is evaluated by the total amount of formaldehyde removed by the time the evaluation is finished.

The results are shown in Table 1 below.

division CCM
(Cumulative purification amount) ranking Example 1 1500 mg or more F4 Example 2 1200 mg F3 Comparative Example 1 360 mg F1 Comparative Example 2 480 mg F1

As a result of the evaluation, Comparative Example 1-2 showed the performance of F1 grade (CCM 500mg or less), which is the lowest grade suggested by Chinese standards, while Example 1-2 to which a deodorizing filter and a white light emitting diode module applied with a visible light active catalyst were applied In the case of , although there are variations depending on the filter type and size, it can be seen that the performance is improved from F3 to the level that can achieve the highest grade of F4.

This is because, in Comparative Example 1-2, since the deodorizing filter is not regenerated, the adsorbable pores are saturated in the evaluation of the cumulative purification amount in which the gas is continuously input, and the removal performance is rapidly reduced. On the other hand, in Example 1-2 to which the visible light active catalyst is applied, the deodorization filter is continuously decomposed due to the light source of the white light emitting diode module installed therein, so the removal performance is maintained without deterioration, so the high cumulative purification It is considered to show the quantity.

Experimental example 2

For Example 2 and Comparative Example 2, the average removal performance evaluation for 10 ppm of formaldehyde, acetaldehyde, acetic acid, ammonia, and toluene 5 major gases in an 8-lube chamber was performed according to the CA standard test (CA is "Clean air"). means "). After setting the evaluation result to the initial value, the above evaluation was repeatedly performed to evaluate how much the average removal performance deteriorated compared to the initial value.

The results are shown in FIG. 3 .

In the case of Example 2 in which the visible light active catalyst was coated on the deodorizing filter, the lifespan of the deodorizing filter was increased due to the continuous decomposition effect. Since the deodorizing filter of Comparative Example 2 removes harmful gases by physical adsorption of activated carbon and chemical adsorption by an adsorbent, it can be seen from FIG. 3 that the removal performance continuously decreases with the use time. On the other hand, in the case of Example 2 coated with a visible light-activated catalyst, it can be confirmed that the adsorption performance of the activated carbon is maintained at a certain level by decomposing the harmful gas physically adsorbed on the activated carbon.

Experimental example 3

With respect to Example 2, the removal amount according to the illuminance of the white light emitting diode module was measured. The removal amount was evaluated by putting 5 ppm of formaldehyde into the 8-lube chamber and operating the air purifier for 30 minutes.

The results are shown in FIG. 4 .

In the case of the air purifier of Example 2, the maximum efficiency is shown at 25,000 lux.

Experimental example 4

For the air purifiers of Examples 1 and 3-6, evaluation was performed to confirm the performance change according to the loading amount and distance. For evaluation, the removal performance for formaldehyde was evaluated by coating a visible light catalyst on an activated carbon filter.

Table 2 below shows the results.

division Example 3
(3g loading; 0.5cm apart) Example 4
(3g loading; 1.0cm) Example 1
(3g loading; 1.5cm) Example 5
(3g loading; 3.0cm) Example 6
(3g loading; 6.0cm) Removal rate (%) 57 60 81 82 79 distance from light source Example 7
(5g loading; 0.5cm apart) Example 8
(5g loading; 1.0cm apart) Example 9
(5g loading; 1.5cm apart) Example 10
(5g loading; 3.0cm apart) Example 11
(5g loading; 6.0cm apart) Removal rate (%) 77 80 94 96 94

From the above results, it can be seen that the removal efficiency increases when the loading amount of the visible light-activated catalyst is increased. In addition, it can be seen that the removal performance changes according to the distance when the same light source is used. If the distance between the light source and the deodorizing filter is too close, the area to which the light is not irradiated to the filter increases and the efficiency of the visible light-activated catalyst is lowered. Accordingly, it can be seen that Examples 1, 5-6, and 9-11 exhibit better efficiency.

Although preferred embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements by those skilled in the art using the basic concept of the present invention defined in the following claims are also present. It belongs to the scope of the invention.

1: activated carbon
2: Visible light active catalyst
10: deodorizing filter
20: white light emitting diode module
100: air purifier

Claims (9)

a deodorizing filter comprising a visible light active catalyst; and a white light emitting diode module;
The deodorizing filter further includes activated carbon, and includes 100 parts by weight of activated carbon and 2 to 10 parts by weight of a visible light active catalyst,
The white light emitting diode module emits light with an illuminance of 20,000 lux to 30,000 lux,
The distance between the white light emitting diode module and the deodorizing filter is 1.5 cm to 6 cm
air cleaner.
delete According to claim 1,
The visible light active catalyst comprises 100 parts by weight of porous metal oxide particles and 0.1 to 10 parts by weight of metal particles supported on the porous metal oxide particles
air cleaner.
4. The method of claim 3,
The porous metal oxide includes at least one selected from the group consisting of titanium oxide, tungsten oxide, zinc oxide, niobium oxide, and combinations thereof,
The metal particles include tungsten, chromium, vanadium, molybdenum, copper, iron, cobalt, manganese, nickel, platinum, gold, silver, cerium, cadmium, zinc, magnesium, calcium, strontium, barium, radium, palladium, and these metal particles. comprising at least one selected from the group consisting of combinations
air cleaner.
According to claim 1,
The deodorizing filter is:
ceramic honeycomb structure; activated carbon-containing fiber base; or a paper structure; including
air cleaner.
6. The method of claim 5,
The ceramic honeycomb structure or the paper structure accommodates particles of activated carbon coated on the surface of the visible light active catalyst in an island shape in an internal accommodation space; or
The ceramic honeycomb structure, the fiber base containing activated carbon, and the paper structure include activated carbon in internal pores, and the visible light active catalyst is coated on the surface of the structure containing the activated carbon.
air cleaner.
According to claim 1,
The deodorizing filter does not contain an organic binder
air cleaner.
delete delete

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