KR20110070557A - Air purification apparatus using nanometal/photocatalyst sol - Google Patents

Abstract

PURPOSE: An air purification apparatus using nanometal/photocatalyst sol reacting to an LED(Light emitting Diode) lamp is provided to increase saturated adsorption efficiency of a filter by using a filter coated with the nanometal/photocatalyst sol filter to thereby improve purification efficiency. CONSTITUTION: An air purification apparatus using nanometal/photocatalyst sol reacting to an LED lamp adsorbs impurities contained in the air using an adsorbent. The air purification apparatus decomposes the adsorbed impurities by optical activity of nanometal/photocatalyic coating layer coated on the surface of the adsorbent. A light source which generates the optical activity is an LED lamp. The nanometal/photocatalytic coating layer is a nanometal/photocatalyst slurry composition. An alcoholometer organic solvent of 10-30 parts by weight, water of 50-70 parts by weight, titanium precursor of 5-15 parts by weight, a transition metal of 0.5-10 parts by weight, nitric acid of 0.5-5 parts by weight, and chelate stabilizer of 0.1-5 parts by weight are mixed in a reactor. The mixture is agitated at a temperature of 60°C-90°C to form the nanometal/photocatalyst slurry composition.

Description

Air purification apparatus using nanometal / photocatalyst sol reacting to LED lamp

The present invention relates to an air purifier, and more particularly, to an LED lamp using a nanometal / photocatalyst sol-coated adsorbent filter that is photoactive and decomposes pollutants in response to an LED lamp in the wavelength range of 395 to 400 nm. The present invention relates to an air purifier using nanometal / photocatalyst sol.

Generally, large amounts of volatile organic compounds are emitted during painting, drying, printing, bonding, or dry cleaning, gasoline and diesel, and legally to ensure that no volatile organic compounds are released into the atmosphere for these processes or facilities. It is regulated.

Volatile organic compounds are not only a source of odor when they are released into the atmosphere, but also react with sunlight and nitric oxide compounds (NOx) to form photochemical smog, which can cause eye irritation in humans and, in severe cases, respiratory illness. . It is also known to adversely affect plants.

In particular, volatile organic compounds generated in printing shops, furniture manufacturing, machinery and ship manufacturing, and automobile repairs are specified in the THC (Total Hydrocarbon Concentration) regulation for coating facilities under the Atmospheric Conservation Act. have.

Currently, activated carbon adsorption tower, which is mandatory to be installed in domestic volatile organic compound discharge facility, is a container made of steel structure to hold activated carbon, filled with activated carbon mainly in the form of particles, and volatile organic compound from the side or the bottom. It is an apparatus manufactured so that the purified air can escape from the upper part by injecting this containing air and adsorbing a volatile organic compound with activated carbon.

The activated carbon adsorption tower currently on the market has the advantage of simple structure and low cost of activated carbon. However, when the amount of volatile organic compounds is emitted, the activated carbon adsorption capacity is saturated (breakthrough) in a short time. May be released into the atmosphere without being reduced. In fact, most of the adsorption towers are regularly replaced with activated carbon, but some of them are using activated carbons with activated carbon saturated.

Activated carbon, which is the filler of the adsorption column, and the adsorption tower that accommodates it are cheaper than other treatment devices such as incineration, regenerative incineration, and microbial treatment, considering the cost of treating volatile organic compounds. There is much burden on the side.

Therefore, it is necessary to reduce the cost of replacing activated carbon by increasing the processing capacity of activated carbon in the adsorption column so as to increase the service life of activated carbon.

In order to extend the life of activated carbon, hot air or steam is blown out to activated carbon periodically to release the adsorbed volatile organic compounds, the activated carbon is heated electrically to release the adsorbed volatile substances, and the activated carbon is coated with adsorption A method of slowly oxidatively decomposing volatile organic compounds and a method of applying a photocatalyst to activated carbon and irradiating ultraviolet rays or the like to oxidize and remove volatile organic compounds adsorbed on activated carbon are known. However, this method has a disadvantage in that a heating wire or a device for generating steam not only raises the price of the adsorption tower but also consumes a lot of energy to generate steam or heat. In addition, the low-temperature catalyst has a low reaction rate for oxidizing and removing volatile organic compounds, and thus, it takes a long time to regenerate the adsorption capacity of activated carbon, and in the case of the photocatalyst, the use of an ultraviolet lamp has a disadvantage.

Therefore, it is easy to use and economical wavelength of 395 ~ 400nm LED, developed granular activated carbon coated with a photocatalyst that is well activated in the light of short wavelength LED to increase the adsorption life of the activated carbon as an adsorbent to increase the replacement cycle of activated carbon Ways to increase should be developed.

Accordingly, the present invention has been made to solve the above problems of the prior art, by applying a nano-metal / photocatalyst sol that effectively decomposes the volatile organic compounds in the light of the LED (LED) on the surface of the adsorbent filter LED ( The nano metal / photocatalyst coated on the surface of the adsorbent filter by LED lamp continuously decomposes and removes the volatile organic compound adsorbed on the adsorbent filter, thereby increasing the adsorption capacity for the volatile organic compound of the adsorbent filter. An object of the present invention is to provide an air purifier using a metal / photocatalyst sol.

In order to achieve the above object, the present invention provides an air purifying apparatus in which air containing impurities is introduced and impurities are adsorbed to the adsorbent, and the adsorbed impurities are decomposed by the photoactivity of the nanometal / photocatalyst coating layer coated on the surface of the adsorbent. The light source causing the photoactivity is an LED lamp, and the nanometal / photocatalyst coating layer comprises 10-30 parts by weight of an alcohol-based organic solvent, 50-70 parts by weight of water as an aqueous solvent, and 5-5 parts of a titanium precursor. 15 parts by weight, 0.5 to 10 parts by weight of a transition metal as a metal precursor, 0.5 to 5 parts by weight of nitric acid and 0.1 to 5 parts by weight of a chelating stabilizer as a catalyst are mixed in a reactor and stirred at a temperature of 60 ° C to 90 ° C. An air purifier using a nanometal / photocatalyst sol reacting to an LED lamp composed of the formed nanometal / photocatalyst slurry composition is a technical subject.

Herein, the aqueous solvent is preferably pure water ionized.

The titanium precursor is preferably TTIP (Titanium Tetraisopropoxide).

It is preferable that the said chelate stabilizer is acetyl acetone.

The alcohol-based organic solvent preferably contains at least one of ethyl alcohol and isopropyl alcohol.

The transition metal is preferably a metal selected from zinc (Zn), silver (Ag), and copper (Cu).

The coating layer is preferably formed by spray coating.

Accordingly, the nanometal / photocatalyst sol coated filter which photoactively decomposes pollutants in response to LED lamps in the wavelength range of 395 to 400 nm is used, thereby increasing the saturation adsorption efficiency of the adsorbent filter, thereby increasing the purification efficiency. There is an advantage.

According to the present invention, the saturation adsorption efficiency of the sorbent filter is increased because it adopts a nano metal / photocatalyst sol coated filter which is photoactive and decomposes pollutants in response to an LED lamp in the wavelength range of 395 to 400 nm. As a result, the purification efficiency is increased.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.

The core of the air purifier using a nanometal / photocatalyst sol reacting to the LED lamp according to the present invention is a nanometal / photocatalyst sol coated on the surface of the activated carbon as an adsorbent, first, the nanometal / photocatalyst sol.

Ⅰ. Method for preparing nanometal / photocatalyst sol reacting to LED lamp

Nanometal / photocatalyst sols were prepared according to the following ten examples.

First Embodiment

The first embodiment of the present invention,

14 parts by weight of ethyl alcohol as an organic solvent and 12 parts by weight of isopropyl alcohol (hereinafter referred to as IPA), 62 parts by weight of pure ionized water as an aqueous solvent, and TTIP (Titanium Tetraisopropoxide) as a Ti precursor of a photocatalyst. 10 parts by weight, 1 part by weight of zinc (Zn) in the transition metal as a metal precursor, 1 part by weight of 2N (Normal) concentration of silver nitrate as a catalyst, and 0.5 part by weight of acetyl acetone as a chelate stabilizer, It stirred at the speed of 500 rpm. At this time, the reactor was maintained at a temperature of about 70 ℃ ~ 80 ℃ and the stirring time was stirred about 4 hours.

The reaction proceeded by the above process to prepare a nanometal / photocatalyst colloidal solution.

Second Embodiment

The second embodiment of the present invention,

24 parts by weight of ethyl alcohol as an organic solvent, 60 parts by weight of pure ionized water as an aqueous solvent, 10 parts by weight of titanium tetraisopropoxide (TTIP) as a Ti precursor of a photocatalyst, and zinc (Zn) in a transition metal as a metal precursor. 5 parts by weight, 1 part by weight of 2N (Normal) concentration of silver nitrate as a catalyst, and 0.5 part by weight of acetyl acetone as a chelating stabilizer were added to the reactor, followed by stirring at a speed of about 500 rpm in the reactor. At this time, the reactor was maintained at a temperature of about 70 ℃ ~ 80 ℃ and the stirring time was stirred about 4 hours.

The reaction proceeded by the above process to prepare a nanometal / photocatalyst colloidal solution.

Third Embodiment

The third embodiment of the present invention,

24 parts by weight of isopropyl alcohol (hereinafter referred to as IPA) as an organic solvent, 60 parts by weight of pure ionized water as an aqueous solvent, 10 parts by weight of titanium tetraisopropoxide (TTIP) as a Ti precursor of a photocatalyst, 5 parts by weight of zinc (Zn) in the transition metal as a metal precursor, 1 part by weight of 2N (Normal) concentration of silver nitrate as a catalyst, and 0.5 part by weight of acetyl acetone as a chelating stabilizer were added to the reactor, followed by stirring at a rate of about 500 rpm in the reactor. . At this time, the reactor was maintained at a temperature of about 70 ℃ ~ 80 ℃ and the stirring time was stirred for about 4 hours.

The reaction proceeded by the above process to prepare a nanometal / photocatalyst colloidal solution.

Fourth Embodiment

The fourth embodiment of the present invention,

14 parts by weight of ethyl alcohol as an organic solvent and 12 parts by weight of isopropyl alcohol (hereinafter referred to as IPA), 62 parts by weight of pure ionized water as an aqueous solvent, and TTIP (Titanium Tetraisopropoxide) as a Ti precursor of a photocatalyst. 10 parts by weight, 1 part by weight of silver (Ag) in the transition metal as a metal precursor, 1 part by weight of 2N (Normal) concentration of silver nitrate as a catalyst, and 0.5 part by weight of acetyl acetone as a chelating stabilizer, It stirred at the speed of 500 rpm. At this time, the reactor was maintained at a temperature of about 70 ℃ ~ 80 ℃ and the stirring time was stirred about 4 hours.

The reaction proceeded by the above process to prepare a nanometal / photocatalyst colloidal solution.

Fifth Embodiment

The fifth embodiment of the present invention,

24 parts by weight of ethyl alcohol as an organic solvent, 60 parts by weight of pure ionized water as an aqueous solvent, 10 parts by weight of titanium tetraisopropoxide (TTIP) as a Ti precursor of a photocatalyst, and silver (Ag) in transition metal as a metal precursor. 5 parts by weight, 1 part by weight of 2N (Normal) concentration of silver nitrate as a catalyst, and 0.5 part by weight of acetyl acetone as a chelating stabilizer were added to the reactor, followed by stirring at a speed of about 500 rpm in the reactor. At this time, the reactor was maintained at a temperature of about 70 ℃ ~ 80 ℃ and the stirring time was stirred about 4 hours.

The reaction proceeded by the above process to prepare a nanometal / photocatalyst colloidal solution.

Sixth Embodiment

In a sixth embodiment of the present invention,

24 parts by weight of isopropyl alcohol (hereinafter referred to as IPA) as an organic solvent, 60 parts by weight of pure ionized water as an aqueous solvent, 10 parts by weight of titanium tetraisopropoxide (TTIP) as a Ti precursor of a photocatalyst, 5 parts by weight of silver (Ag) in the transition metal as a metal precursor, 1 part by weight of 2N (Normal) concentration of silver nitrate as a catalyst, and 0.5 part by weight of acetyl acetone as a chelating stabilizer were added to the reactor, followed by stirring at a speed of about 500 rpm in the reactor. . At this time, the reactor was maintained at a temperature of about 70 ℃ ~ 80 ℃ and the stirring time was stirred for about 4 hours.

The reaction proceeded by the above process to prepare a nanometal / photocatalyst colloidal solution.

Seventh Embodiment

The seventh embodiment of the present invention,

26 parts by weight of isopropyl alcohol (hereinafter referred to as IPA) as an organic solvent, 62 parts by weight of pure ionized water as an aqueous solvent, 10 parts by weight of titanium tetraisopropoxide (TTIP) as a Ti precursor of a photocatalyst, 1 part by weight of copper (Cu) in the transition metal as a metal precursor, 1 part by weight of 2N (Normal) concentration of silver nitrate as a catalyst, and 0.5 part by weight of acetyl acetone as a chelating stabilizer were added to the reactor, followed by stirring at a speed of about 500 rpm in the reactor. I was. At this time, the reactor was maintained at a temperature of about 70 ℃ ~ 80 ℃ and the stirring time was stirred about 4 hours.

The reaction proceeded by the above process to prepare a nanometal / photocatalyst colloidal solution.

Eighth Embodiment

An eighth embodiment of the present invention,

24 parts by weight of ethyl alcohol as an organic solvent, 60 parts by weight of pure water ionized as an aqueous solvent, 10 parts by weight of titanium tetraisopropoxide (TTIP) as a Ti precursor of a photocatalyst, and copper (Cu) in a transition metal as a metal precursor. 5 parts by weight, 1 part by weight of 2N (Normal) concentration of silver nitrate as a catalyst, and 0.5 part by weight of acetyl acetone as a chelating stabilizer were added to the reactor, followed by stirring at a rate of about 500 rpm in the reactor. At this time, the reactor was maintained at a temperature of about 70 ℃ ~ 80 ℃ and the stirring time was stirred about 4 hours.

The reaction proceeded by the above process to prepare a nanometal / photocatalyst colloidal solution.

<Ninth Embodiment>

In a ninth embodiment of the present invention,

24 parts by weight of isopropyl alcohol (hereinafter referred to as IPA) as an organic solvent, 60 parts by weight of pure ionized water as an aqueous solvent, 10 parts by weight of titanium tetraisopropoxide (TTIP) as a Ti precursor of a photocatalyst, 5 parts by weight of copper (Cu) in the transition metal as a metal precursor, 1 part by weight of 2N (Normal) concentration of silver nitrate as a catalyst, and 0.5 part by weight of acetyl acetone as a chelating stabilizer were added to the reactor, followed by stirring at a speed of about 500 rpm in the reactor. . At this time, the reactor was maintained at a temperature of about 70 ℃ ~ 81 ℃ and the stirring time was stirred about 4 hours.

The reaction proceeded by the above process to prepare a nanometal / photocatalyst colloidal solution.

Tenth Embodiment

In a tenth embodiment of the present invention,

12 parts by weight of ethyl alcohol and 12 parts by weight of isopropyl alcohol (hereinafter referred to as IPA) as an organic solvent, 60 parts by weight of pure ionized water as an aqueous solvent, and TTIP (Titanium Tetraisopropoxide) as a Ti precursor of the photocatalyst. 10 parts by weight, 5 parts by weight of copper (Cu) in the transition metal as a metal precursor, 1 part by weight of 2N (Normal) concentration of silver nitrate as a catalyst, and 0.5 parts by weight of acetyl acetone as a chelating stabilizer, It stirred at the speed of 500 rpm. At this time, the reactor was maintained at a temperature of about 70 ℃ ~ 80 ℃ and the stirring time was stirred about 4 hours.

The reaction proceeded by the above process to prepare a nanometal / photocatalyst colloidal solution.

Table 1 below shows the physical properties of the additive amounts of the above examples, and the amount is in weight units.

TEM photographs of the primary particles prepared by the above examples showed nano-size. In particular Cu / TiO ₂ formed from the primary particles of Example 9 It can be seen that the particle size is shown in 3 ~ 5nm size as shown in FIG.

Next, the XRD measurement was performed for the above embodiments, and the XRD measurement results for the third, sixth, and ninth embodiments of the examples are shown in FIG. 2. As shown in FIG. 2, the composition according to the third, sixth, and ninth embodiments is similar to the XRD pattern of the anatase type TiO ₂ shown in FIG. 2, and according to the third, sixth, and ninth embodiments The composition can be seen that anatase type photocatalyst was formed. The rest was similar.

Next, the photoactive decomposition experiments were carried out on the LED lamps for the above embodiments, and the photoactive decomposition efficiency was found to be excellent.

3 is a view showing the removal efficiency of the contaminants of the nanometal / photocatalyst sol, the nanometal / photocatalyst sol of the ninth embodiment was used, the rest was similar results.

0.3g of the nanometal / photocatalyst (Cu / TiO ₂ ) of the ninth embodiment was coated on the surface of STS (7cm × 7cm), and TCE (Trichloroehtylene) was decomposed and removed as a contaminant.

The reaction vessel had an initial concentration of 98 ppm in a 3.4 L HDPE container.

Four 0.068 W of LEDs (LED) were subjected to decomposition reaction at a distance of 4 cm from the photocatalyst surface. As an analyzer, ppb RAE 3000 (USA) analyzer was used.

As a comparative example, no coating was used.

The results of the experiment are shown in FIG. 3, and as shown in FIG. 3, it was confirmed that TCE was decomposed by showing photoactivity at 395-400 nm.

When the nano-metal / photocatalyst sol prepared above is coated on activated carbon, the coating rice method is as follows.

II. Activated Carbon Coating of Nanometal / Photocatalyst Sol

The nanometal / photocatalyst sol prepared in Example 9 was coated on activated carbon as an adsorbent, and the coating method was as follows.

First, activated carbon was used as granular activated carbon (cylindrical shape of particle size ~ 2mm, length ~ 5mm), and nanometal / photocatalyst slurry (mixture, slurry) was applied to the surface of activated carbon by spraying (spraying) Coating, coating) was applied so that 10g of nano-metal / photocatalyst per 100g of granular activated carbon was applied. The granular activated carbon coated with the nanometal / photocatalyst in an emulsion (emulsion, suspension, emulsion) is dried at 200 ° C. for 1 hour in an electric oven.

Photocatalyst application method of activated charcoal chip

1) Spread 300 g of activated carbon chips in a wide dish.

2) Coat 30g of nano metal / photocatalyst with proper spray pressure by spray coating method.

3) Shake the activated carbon chip so that it can be evenly coated.

4) Heat treatment is dried for 1 hour at 200 ℃, and completely sealed after cooling.

Through the above process, a nano metal / photocatalyst coated activated carbon chip was completed, and an air purifier using the activated carbon chip as a filter was completed, which will be described below.

III. Air purifier

4 and 5 are schematic views of the air purifying apparatus of the present invention, in which a sealed housing 100 is formed, and the inlet 101 through which the outside air containing impurities such as volatile organic compounds is introduced into the housing 100. Is formed, and the opposite side is formed with an outlet 102 for discharging the purified air to the outside.

In addition, the inside of the housing 100 is provided with a mesh 110 for accommodating the above-described activated carbon filter 111 coated with the nanometal / photocatalyst in the horizontal direction inside the housing 100. The mesh 110 is detachably installed in the housing 100, and when the adsorption capacity of the activated carbon filter 111 falls, the mesh 110 may be separated and the activated carbon filter 111 may be replaced, and then reinstalled.

In addition, a support frame 120 is formed inside the housing 100, and a plurality of LED lamps 130 are installed on the support frame 120. The support frame 120 is installed to be spaced apart from the net network 110 in which the activated carbon filter 111 is installed.

If necessary, the air purifying fan 140 may be installed in the air purifying apparatus as shown in FIG. 5.

The operation effect on the above configuration is as described later.

First, when external air containing impurities such as organic compounds is introduced through the inlet 101, the impurities are adsorbed onto the activated carbon filter 111. When the LED lamp 130 is irradiated with light, the nanometal / photocatalyst coated on the activated carbon filter 111 is photoactivated to decompose and remove odor pollutants such as volatile organic compounds contaminated in the activated carbon filter 111. It is possible to increase the saturation adsorption efficiency of the activated carbon filter 111.

Meanwhile, the purified air is discharged to the outside through the discharge port 102.

Here, the adsorbent is described as an activated carbon filter, but other adsorbents may be used, and it will be obvious that the adsorbent falls within the scope of the present invention.

1 is a view showing a TEM photograph of a nanometal / photocatalyst prepared according to the ninth embodiment of the present invention,

FIG. 2 is a diagram showing XRD measurement results for nanometals / photocatalysts prepared according to Examples 3, 6, and 9 of the present invention.

3 is a view showing the pollutant removal efficiency of the nano-metal / photocatalyst prepared according to the ninth embodiment of the present invention.

4 is a schematic diagram of an air purifier according to an embodiment of the present invention;

5 is a schematic diagram of an air purifying apparatus according to another embodiment of the present invention.

Description of the Related Art

100 housing 101 inlet

102: outlet 110: the net

111: activated carbon filter 120: support frame

130: LED lamp 140: transfer fan

Claims (7)

In the air purifying apparatus in which air containing impurities is introduced and impurities are adsorbed to the adsorbent, and the adsorbed impurities are decomposed by the photoactivity of the nanometal / photocatalyst coating layer coated on the surface of the adsorbent. The light source causing the photoactivity is an LED (LED) lamp, The nano metal / photocatalyst coating layer, 10 to 30 parts by weight of an alcohol-based organic solvent, 50 to 70 parts by weight of water as an aqueous solvent, 5 to 15 parts by weight of a titanium precursor, 0.5 to 10 parts by weight of a transition metal as a metal precursor, and 0.5 to 5 parts by weight of nitric acid as a catalyst. Parts and 0.1-5 parts by weight of a chelate stabilizer in the reactor, and the nanometal / photocatalyst sol reacting to the LED lamp characterized in that the nanometal / photocatalyst slurry composition formed by stirring at a temperature of 60 ℃ ~ 90 ℃ Purifier. The air purifier using the nanometal / photocatalyst sol according to claim 1, wherein the aqueous solvent is ionized pure water. The air purifier of claim 2, wherein the titanium precursor is TTIP (Titanium Tetraisopropoxide). The air purifier of claim 3, wherein the chelate stabilizer is acetyl acetone. According to any one of claims 1 to 4, wherein the alcohol-based organic solvent is air using a nano-metal / photocatalyst sol reacting to the LED lamp, characterized in that it comprises at least one of ethyl alcohol, isopropyl alcohol. Purifier. The air purifier of claim 5, wherein the transition metal is a metal selected from zinc (Zn), silver (Ag), and copper (Cu). 7. The air purifier using the nanometal / photocatalyst sol according to claim 6, wherein the coating layer is formed by spray coating.

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