KR20220125762A - Method for manufacturing photocatalyst-substrate composite and photocatalyst-substrate composite manufactured therefrom - Google Patents

Abstract

A photocatalyst-substrate composite manufacturing method is disclosed. A photocatalyst-substrate composite, according to an embodiment of the present invention, is manufactured by comprising the steps of: (1) preparing a coating solution containing a titanium alkoxide photocatalyst component that is liquid at 23 ℃; and (2) applying the coating solution on a surface of a substrate having a non-porous surface, drying the same, and forming a photocatalyst layer. According to the present invention, photocatalytic properties can be expressed not only in the ultraviolet wavelength band but also in the visible ray wavelength band. In addition, photocatalytic properties such as antimicrobial functions such as antifungal, antibacterial, and antiviral functions and deodorizing functions can be uniformly expressed regardless of the position of the composite, and durability is excellent as the photocatalytic properties are expressed for a long time. Furthermore, the photocatalyst-substrate composite manufacturing method can form a photocatalyst layer having excellent adhesion and high photocatalytic properties easily on the surface of the substrate without separate pretreatment or a process of applying high heat to the photocatalyst layer, and thus, the method can be applied to substrates of various shapes and materials.

Description

Photocatalyst-substrate composite manufacturing method and photocatalyst-substrate composite manufactured therefrom

The present invention relates to a method for manufacturing a photocatalyst-based composite, and more particularly, to a method for manufacturing a photocatalyst-based composite in which a substrate having a non-porous surface and a photocatalyst are complexed, and a photocatalyst-based composite prepared therethrough.

As environmental pollution increases due to industrial development, the harmfulness to the human body due to air pollution is also increasing day by day. have.

The main causes of polluted indoor air are the emission of pollutants due to the advent of new building materials and the pollution of indoor air due to the use of various household products, in addition to the inflow of polluted external air into the room. Pollution in the outside air can be naturally diluted and purified, whereas indoor airtightness is increasing to increase the effectiveness of insulation, heating, and sound insulation. The impact on the people living there is bound to be even greater.

Accordingly, in recent years, much attention has been paid to air purification for removing various air pollutants generated in various industrial sites or transportation means such as automobiles and air pollutants generated indoors.

On the other hand, an air filtration method in which air passes through an air filter member can be used to remove these pollutants, but in the case of air pollutants such as volatile organic compounds (VOCs), which are not particulate pollutants, through a conventional air filter member is not removed Accordingly, in the case of some air filters, activated carbon or zeolite, which filters these pollutants through adsorption, are combined.

In addition, recently, there is a high demand for a purifying function for microorganisms floating in the air, such as various bacteria and viruses, and it is not easy to remove with the above air filter.

Accordingly, recently, a photocatalytic method has been widely applied to various types of air filters. For example, a photocatalyst member coated with titanium oxide (TiO ₂ ) powder, which is a photocatalyst, on a substrate is used. When the photocatalyst member is irradiated with ultraviolet rays having a wavelength of approximately 380 nm or less, titanium oxide, which is a photocatalyst, is excited to generate hydroxyl radical ions (OH ^- ) and oxygen radical ions (O ^- ) with strong oxidizing power. , by oxidizing the pollutants (organic substances) contained in the air passing through by the strong oxidizing power of the generated hydroxy radical ions and oxygen radical ions, they change into substances that do not harm the human body, and in this way, pollutants in the air are removed and anti-corruption, deodorization and sterilization.

However, the method of coating the titanium oxide powder on the substrate has a problem in that the titanium oxide powder, which is a photocatalyst, is not uniformly coated on the surface of the filter medium, and is easily detached after coating. In addition, when the surface of the substrate is enlarged, a predetermined roughness may be formed, such as unevenly pitted grooves. When the titanium oxide powder is coated, the powder does not completely cover the surface on which the grooves are formed, so there may be a portion where the coating layer is not formed. , in particular, as the titanium oxide powder easily forms secondary particles, the photocatalyst layer may not be uniformly formed on the non-smooth surface.

In addition, in the case of a method in which a photocatalyst material is coated with a precursor and then sintered to implement a photocatalyst layer, heat of 600°C or higher is usually required for sintering. There is a problem with losing.

Laid-open Patent Publication No. 10-2000-0074976

The present invention was devised in consideration of the above points, and photocatalyst-based composite manufacturing method in which photocatalytic properties such as antimicrobial functions such as antifungal, antibacterial, and antiviral and deodorizing performance are uniformly expressed regardless of the position of the substrate, and through this An object of the present invention is to provide a prepared photocatalyst-based composite.

In addition, the present invention provides a method for producing a photocatalyst-based composite that exhibits excellent photocatalytic properties and at the same time prevents desorption of the photocatalyst material, thereby ensuring durability to express photocatalytic properties for a long time, and a photocatalyst-based composite prepared through the same. There is a purpose.

In addition, another object of the present invention is to provide a method for preparing a photocatalyst-based composite capable of expressing photocatalytic properties not only in the ultraviolet wavelength region but also in the visible ray wavelength region, and the photocatalyst-based composite prepared through the same.

Furthermore, another object of the present invention is to provide a method for preparing a photocatalyst-based composite capable of easily providing a photocatalyst layer with excellent properties regardless of the shape and material of the substrate used, and a photocatalyst-based composite prepared through the same. .

In order to solve the above problems, the present invention provides (1) preparing a coating solution containing a liquid titanium alkoxide photocatalyst component at 23° C. and (2) treating the coating solution on the surface of a substrate having a non-porous surface. It provides a method for manufacturing a photocatalyst-based composite comprising the step of drying to form a photocatalyst layer.

According to an embodiment of the present invention, the substrate may be formed including any one or more of a metal, a polymer compound, and a ceramic component.

In addition, the coating solution further contains a transition metal component, an acidic solvent and an organic solvent, and the total weight of the transition metal component and the acidic solvent based on the total weight of the coating solution is 2 to 8% by weight, based on the total weight of the coating solution As such, the organic solvent may be contained in an amount of 2 to 5% by weight.

In addition, the transition metal contains at least one selected from the group consisting of manganese, silver, palladium, platinum, gold, copper, manganese, iron, nickel, cobalt, tungsten, and the like, and the acidic solvent includes sulfuric acid or nitric acid, , the organic solvent may include isopropyl alcohol.

In addition, the content of the titanium alkoxide photocatalyst component in the coating solution may be 11 to 15% by weight.

In addition, the titanium alkoxide photocatalyst component is titanium methoxide, titanium ethoxide, titanium tetra n-propoxide, titanium tetraisopropoxide, At least one selected from the group consisting of titanium tetra n-butoxide and titanium tetra tert-butoxide may be included.

온도로 교반시키는 단계, 티타늄 알콕사이드 광촉매 성분과 유기용매를 투입하여 60 ~ 80℃ 온도로 6 ~ 12시간 교반시키는 단계 및 20 ~ 25℃로 냉각시키는 단계를 포함하여 제조될 수 있다. In addition, the coating solution is 60 to 80 after mixing an acidic solvent and a transition metal in distilled water.

It can be prepared including stirring at a temperature, adding a titanium alkoxide photocatalyst component and an organic solvent, stirring at a temperature of 60 to 80° C. for 6 to 12 hours, and cooling to 20 to 25° C.

In addition, the present invention provides a photocatalyst-substrate composite comprising a substrate having a non-porous surface, and a photocatalyst layer coated on the non-porous surface and containing a titanium alkoxide component.

According to an embodiment of the present invention, the photocatalyst-based composite may be manufactured through the above-described manufacturing method according to the present invention.

In addition, the thickness of the photocatalyst layer may be 0.5 μm or less.

In addition, the substrate may have a plurality of hollow cells through which air may pass.

In addition, the present invention provides an air purifying device comprising the photocatalyst-based composite according to the present invention.

The photocatalyst-based composite according to the present invention can exhibit photocatalytic properties not only in the ultraviolet wavelength region but also in the visible light wavelength region. In addition, antimicrobial functions such as antifungal, antibacterial, antiviral, etc. and photocatalytic properties such as deodorizing functions can be uniformly expressed regardless of the location of the complex, and as the photocatalytic properties are expressed for a long time, durability is excellent. Furthermore, the method for preparing such a photocatalyst-substrate composite can easily form a photocatalyst layer having excellent adhesion and high photocatalytic properties on the surface of the substrate without separately pre-treating the substrate or applying high heat to the photocatalyst layer. It can be applied to substrates of shape and material, and is suitable for mass production.

1 is a perspective view of a photocatalyst-based composite according to an embodiment of the present invention and a partially enlarged view along the boundary line XX';
2 and 3 show a photocatalyst-based composite according to an embodiment of the present invention having a photocatalyst layer on the surface of a substrate in which grooves are formed, and a photocatalyst according to a comparative example having a photocatalyst layer formed of a powdery photocatalyst component, respectively. Schematic diagram for the complex,
4 is a schematic diagram and a partially enlarged view of a substrate employed in a photocatalyst-based composite according to an embodiment of the present invention, and
5 to 7 are cross-sectional SEM photographs of a photocatalyst-based composite according to a comparative example provided with a photocatalyst-based composite according to an embodiment of the present invention and a photocatalyst layer formed of a powdery photocatalyst component.

Hereinafter, with reference to the accompanying drawings, 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.

The photocatalyst-substrate composite according to an embodiment of the present invention comprises the steps of (1) preparing a coating solution containing a liquid titanium alkoxide photocatalyst component at 23° C., and (2) applying the coating solution to the surface of a substrate having a non-porous surface. It can be prepared including the step of forming a photocatalyst layer by drying after treatment.

First, as step (1) according to the present invention, a step of preparing a coating solution containing a liquid titanium alkoxide photocatalyst component at 23° C. is performed.

에서 액상인 성분을 광촉매 성분을 함유하며, 구체적으로 티타늄알콕사이드 성분을 광촉매 성분으로 포함한다. 종래 광촉매를 소정의 기재 상에 구비 시 분말 형태의 광촉매를 코팅용액에 분산시켜서 기재에 처리하는 것이 일반적이었다. 그러나 분말 형태의 광촉매는 코팅용액 내에서 2차 응집을 일으키는 등 균일하게 분산되지 못함에 따라서 코팅 후 매끄럽고, 균일 두께의 광촉매 코팅층을 형성시키기 어려웠다. 특히 도 3에 도시된 것과 같이 기재(10) 표면에는 다양한 깊이, 형상의 홈이 형성될 수 있는데, 이와 같은 표면 상에 코팅용액이 처리 시 용액 상태에서는 홈에 코팅용액이 담지되더라도 용매가 휘발, 증발 시 코팅용액 내 분말들은 2차 응집을 일으켜 표면을 군데군데 덮는 광촉매층(20')이 구현되는 것이 일반적이었다. 나아가 코팅용액을 기재 표면 상에 처리 후 코팅용액의 흘러내림이 발생할 수 있어서 광촉매층의 두께 불균일은 더욱 심화되는 문제가 있었다. 더불어 분말 상인 광촉매가 코팅 후에 기재에서 쉽게 탈락되는 문제도 있었다. The coating solution is a photocatalyst solution containing a photocatalyst component, 23

In the liquid component contains a photocatalyst component, specifically, includes a titanium alkoxide component as a photocatalyst component. Conventionally, when a photocatalyst is provided on a predetermined substrate, it is common to disperse the photocatalyst in powder form in a coating solution and process the photocatalyst on the substrate. However, since the photocatalyst in powder form was not uniformly dispersed, such as causing secondary aggregation in the coating solution, it was difficult to form a smooth and uniform photocatalyst coating layer after coating. In particular, as shown in FIG. 3, grooves of various depths and shapes may be formed on the surface of the substrate 10, and when the coating solution is treated on such a surface, in a solution state, even if the coating solution is supported in the groove, the solvent volatilizes, Upon evaporation, the powders in the coating solution cause secondary aggregation to form a photocatalyst layer 20 ′ covering the surface here and there. Furthermore, since the coating solution may flow down after the coating solution is treated on the surface of the substrate, there is a problem that the thickness non-uniformity of the photocatalyst layer is further aggravated. In addition, there was a problem in that the photocatalyst in powder form was easily removed from the substrate after coating.

In order to solve this problem, the inventors of the present invention included a titanium alkoxide component, which is liquid at room temperature, that is, 23° C., as a photocatalyst component in the coating solution, rather than a method of coating a powdery photocatalyst on a substrate to solve this problem. It was found that it was possible to prevent non-uniformity, to minimize or prevent the drop-off of the photocatalyst component, and to exhibit excellent photocatalytic properties, leading to the present invention. On the other hand, the titanium alkoxide component has been widely known as a precursor used for producing titanium dioxide known to have a photocatalytic function or used as a catalyst used to prepare a specific high molecular compound in the prior art, but the photocatalytic function of the titanium alkoxide component itself has been reported there is no bar

The titanium alkoxide component is preferably titanium methoxide, titanium ethoxide, titanium tetra n-propoxide, titanium tetraisopropoxide, It may include one or more selected from the group consisting of titanium tetra n-butoxide and titanium tetra tert-butoxide, for example, titanium tetra n-propoxide. can be

The photocatalytic component, which is the titanium alkoxide component, may be contained in an amount of 11 to 15% by weight in the coating solution, which is advantageous to achieve a desired level of photocatalytic properties.

In addition, the coating solution is a transition metal component capable of increasing the photocatalytic function together with the titanium alkoxide component in addition to the photocatalytic component, an acidic solvent capable of dissolving the transition metal component, and the titanium alkoxide component is a transition metal component and / or an acidic solvent It may further contain an organic solvent to prevent a decrease in dispersibility in the coating solution that may be reacted with.

The transition metal component may contain at least one selected from the group consisting of manganese, silver, palladium, platinum, gold, copper, manganese, iron, nickel, cobalt, tungsten, and the like, and may be, for example, manganese, through which the raw material While reducing the unit cost, there is an advantage in that it is combined with a titanium alkoxide component to express more enhanced photocatalytic properties. For example, the transition metal may be included in an amount of 0.5 to 3% by weight in the coating solution, thereby achieving higher photocatalytic properties and not inhibiting the adhesion properties on the surface of the substrate after coating.

In addition, the acidic solvent may contain one or more of nitric acid, sulfuric acid, and the like. The acidic solvent is provided as a solvent for dissolving the transition metal, and may be included in an amount of 0.5 to 5% by weight in the coating solution, thereby increasing the solubility of the transition metal component while not impairing the coating workability.

In addition, as the organic solvent, an organic solvent known to improve the dispersibility of the titanium alkoxide component may be used without limitation, and may contain, for example, at least one selected from the group consisting of isopropyl alcohol and ethylene glycol.

In addition, the total weight of the transition metal component and the acid solvent may be 1 to 8% by weight based on the total weight of the coating solution. If the content is less than 1% by weight, it may be difficult to express the desired elevated photocatalytic properties, and when it exceeds 8% by weight, the dispersibility of the titanium alkoxide photocatalyst component is lowered, so that the photocatalyst component is unevenly distributed on the surface of the substrate. there is In addition, based on the total weight of the coating solution, the organic solvent is preferably contained in an amount of 2 to 5% by weight, and if the organic solvent is contained in an amount of less than 2% by weight, the liquid titanium alkoxide component due to the transition metal component and the acidic solvent is It may be difficult to prevent agglomeration in the coating solution. In addition, when the organic solvent exceeds 5% by weight, there is a concern that coating workability may be impaired.

On the other hand, when the coating solution does not contain a transition metal component and an acidic solvent, the coating solution may consist of only a titanium alkoxide component, which is a photocatalyst component, or may contain a small amount of an organic solvent.

The above-described coating solution is prepared by mixing an acidic solvent and a transition metal in distilled water and stirring at a temperature of 60 to 80°C, adding a titanium alkoxide photocatalyst component and an organic solvent and stirring at a temperature of 60 to 80°C for 6 to 12 hours and 20 It can be prepared including the step of cooling to ~ 25 ℃, thereby improving the dispersibility of the photocatalyst component in the coating solution, there is an advantage that can work at room temperature.

Next, as step (2) according to the present invention, the coating solution is treated on the surface of the substrate having a non-porous surface and dried to form a photocatalyst layer.

The substrate may be used without limitation in shape, size, and material in the case of a known substrate having a non-porous surface. For example, the substrate may be formed including at least one of a metal, a polymer compound, and a ceramic component. Preferably, it may be Fecralloy or 400-series stainless steel (STS400), which has the advantage of minimizing peeling of the catalyst layer coated on the substrate surface.

In addition, the substrate may be provided with a plurality of hollow cells through which air can pass. The plurality of hollow cells may have a cross section of a waveform (refer to FIG. 4), a hemispherical shape, a spherical shape, or a polygon, and the polygon may have a shape such as a honeycomb (refer to FIG. 1), a triangle, or a square.

On the other hand, the photocatalyst-based composite according to an embodiment of the present invention may employ the substrate 200 of the metal monolith honeycomb structure shown in FIG. 4 as a substrate. When describing the substrate 200 in detail, it may be formed of a case 210 through which both sides are penetrated, and a flat plate 220 and a corrugated plate 230 alternately stacked on the case 210 .

The case 210 has a rectangular shape with both ends open, and both ends of the case 210 are connected to a flow path through which the air to be purified flows. The flat plate 220 and the corrugated plate 230 are formed of a thin metal plate, and the thickness thereof is preferably 20 to 100 μm. The corrugated plate 230 is formed in a corrugated shape or a concave-convex shape, and the flat plate 220 is formed in a flat plate shape, and is alternately stacked inside the case 210, and a passage 222 through which the air to be purified passes is provided. is formed A photocatalyst layer may be formed on the surface of the flat plate 220 and the corrugated plate 230 .

In the corrugated plate 230, a first corrugated plate 232 and a second corrugated plate 234 are alternately and repeatedly stacked with a flat plate 220 interposed therebetween, and the first corrugated plate 232 and the second corrugated plate are alternately stacked. At 234 , the first wavy part 242 convexly protruding upward and the second corrugation part 244 convexly protruding downward may be repeated to form a wave shape.

The vertex A of the first corrugated portion 242 of the first corrugated plate 232 and the vertex B of the second corrugated portion 244 of the second corrugated plate 234 are assembled to face each other. That is, the vertex A of the first waveform part 242 and the vertex B of the second waveform part 244 may be assembled to face each other with the flat plate 220 interposed therebetween.

In this way, since the vertices of the corrugated plate 230 are assembled to match each other, the supporting force between the corrugated plates 230 is improved, and the corrugated plate ( Deformation of the 230 and the flat plate 220 can be minimized.

In addition, the flat plate 220 and the corrugated plate 230 are inserted into the case 210 to prevent the flat plate 220 and the corrugated plate 230 from being separated from the case 210 by the pressure through which air passes. A separation prevention unit 250 for fixing the flat plate 220 and the corrugated plate 230 to the case 210 may be formed.

Meanwhile, in relation to the substrate 200 shown in FIG. 4 , Korean Patent Publication No. 10-2021-0016837 by the applicant of the present invention is incorporated by reference.

On the other hand, the surface of the above-described substrate 10,200 may be subjected to a pretreatment process for improving adhesion characteristics with the photocatalyst layer formed after the coating solution treatment. characteristics can be expressed.

In addition, the method of treating the coating solution on the surface of the substrate 10,200 can be used without limitation in the case of known coating methods, for example dip coating, comma coating, reverse coating, gravure coating, braid coating, silk screen and slot It may be any one method selected from the group consisting of die head coating.

In addition, the coating solution treated on the surface of the substrate 10,200 may form a photocatalyst layer through drying. The drying may be accomplished by being left at room temperature for a predetermined time or by applying heat and/or wind for a predetermined time. At this time, the applied heat may be applied at a lower level in consideration of the heat resistance level of the substrate, and the present invention is not particularly limited thereto.

The photocatalyst-based composite 100 according to an embodiment of the present invention implemented through the above-described manufacturing method is coated on the substrate 10 and the non-porous surface having a non-porous surface as shown in FIG. 1, and a photocatalyst layer 20 containing a titanium alkoxide component.

The photocatalyst layer 20 may have a thickness of 0.5 μm or less, another example of 0.3 μm or less, while being thinly formed on the surface of the substrate and may be uniformly formed.

In addition, the above-described photocatalyst-based composite 100 may be implemented as an air purification device. The air purifier may be commonly referred to as an air purifier. The air purifier may further include various types of filter members known as air filters for filtering foreign substances such as dust in the air.

In addition, the air purifier may further include a light source for activating the photocatalyst-based composite 100 , and the light source may emit a wavelength in an ultraviolet region and/or a visible light region.

The present invention will be described in more detail through the following examples, but the following examples are not intended to limit the scope of the present invention, which should be construed to aid understanding of the present invention.

<Example 1>

In order to prepare a coating solution, 820 g of distilled water was placed in a beaker, 15 g of nitric acid and 3.5 g of manganese nitrate were added and stirred until it reached 70°C. Then, 140 g of titanium tetraisopropoxide (TTIP) and 21 g of isopropyl alcohol (IPA) were added, followed by stirring for 8 hours.

After that, the stirring solution was left to cool to 23°C at room temperature to prepare a coating solution. Thereafter, the coating solution was treated through dip coating on the honeycomb made of pecraloiy material and dried at 50° C. to prepare a photocatalyst-based composite in which a photocatalyst layer having a thickness of about 120 nm was formed on the honeycomb surface.

<Comparative Example 1>

For titanium dioxide (TiO2) coating, 15 g of Anatase type TiO ₂ and 1.5 g of a binder were added to 100 g of distilled water and then ball milled to prepare a TiO ₂ sol type coating solution.

Then, the coating solution is treated through dip coating on the Pecralloy honeycomb, dried at 50°C, and then calcined at 500°C and in an air atmosphere for 2 hours to obtain titanium dioxide powder with a thickness of 3 to 5 μm on the surface of the metal honeycomb. A photocatalyst-based composite in which a photocatalyst layer formed of was formed was prepared.

<Comparative Example 2>

For zinc oxide (ZnO) coating, 6 g of zinc oxide (ZnO) and 1.5 g of a binder were added to 100 g of distilled water, and then ball milled to prepare a zinc oxide (ZnO) coated sol.

After that, the coating solution is treated through dip coating on the honeycomb made of Pecraloiy material, dried at 50°C, and then fired at 500°C in an air atmosphere for 2 hours to form zinc oxide with a thickness of 1 to 3㎛ on the surface of the metal honeycomb. A photocatalyst-based composite in which a photocatalyst layer formed of powder was formed was prepared.

<Experimental Example 1>

The cross-sectional SEM images of the photocatalyst-based composites according to Example 1 and Comparative Examples 1 to 2 were taken and shown in FIGS. 5 to 7 .

As can be seen from FIGS. 5 to 7 , the photocatalyst layer of Example 1 of FIG. 5 had a uniform photocatalyst layer with a thickness of 0.2 μm, whereas in Comparative Example 1 of FIG. 6 and Comparative Example 2 of FIG. 7 It can be seen that the photocatalyst layer has a thickness of 3 to 5 μm and 1 to 3 μm, respectively, and a photocatalyst layer having a non-uniform thickness is realized.

<Example 2>

It was prepared in the same manner as in Example 1, except that the material of the substrate was changed to STS to prepare a photocatalyst-based composite.

<Experimental Example 2>

The antibacterial and antifungal activity of the photocatalyst-based composite according to Example 2 was evaluated.

First, in relation to the antimicrobial evaluation, the antimicrobial activity against Staphylococcus aureus (ATCC 6538) and Escherichia coli, which are Staphylococcus aureus, was evaluated according to JIS Z 2801:2010. At this time, the antibacterial properties were examined by irradiating visible light after 0.4 ml of the pre-culture solution for 24 hours was placed on the photocatalyst-based composite specimen. At this time, as a control, a sterilized PP film was used as a specimen. In addition, the concentration of the inoculum solution was 2.5×10 ⁵ CFU/ml for each bacteria. On the other hand, if the antibacterial activity value is 2.0 or higher, it is evaluated that there is an antibacterial effect.

[ceremony]

Example 2 control Staphylococcus aureus Bacteria count after 24 hours
(CFU/mL) <10 4.0×10 ⁵ antibacterial activity 4.6 - coli Bacteria count after 24 hours
(CFU/mL) 1.5×10 ⁷ 3.5×10 ⁷ antibacterial activity 3.4 -

As can be seen from Table 1, the photocatalyst-based complex according to Example 2 was evaluated to have antibacterial activity values of 4.6 (removal rate 99.998%) and 3.4 (removal rate 99.96%) against Staphylococcus aureus and E. coli, respectively. In general, when the antibacterial activity value is 2.0 or more, it can be seen that when it is considered that there is antibacterial activity, the antibacterial activity of the photocatalyst-based complex according to Example 2 greatly exceeds the conventional reference value, and excellent antibacterial activity is expressed even under visible light irradiation.

Next, with respect to antifungal evaluation, mold growth was evaluated according to ASTM G 21, and Trichodema virens (ATCC 9645) was used as the test strain. At this time, the mold growth rate was evaluated as 0 to 4 according to the following criteria after culturing for 2 weeks while irradiating visible light after dispensing the test strain on the specimen, and the results are shown in Table 2 below. In this case, filter paper (Whatman, Grade 1, Φ 55 mm) was used as a control specimen.

[Evaluation standard]

0 = Bacteria not seen, 1 = Traces of growth of bacteria visible (less than 10%), 2 = Bacteria slightly growing (10-30%), 3 = Bacteria growing (30-60%), 4 = Bacteria growing Growing a lot (60-100%)

Example 2 control Trichodema virens (ATCC 9645) fungal growth 0 4

As can be seen from Table 2, the photocatalyst-based composite according to Example 2 was evaluated as having a mold growth rate of 0 for the mold Trichodema virens (ATCC 9645). Therefore, the photocatalyst-based composite according to Example 2 was irradiated with visible light. It can be seen that excellent antifungal activity is also expressed.

Although one embodiment of the present invention has been described above, the spirit of the present invention is not limited to the embodiments presented herein, and those skilled in the art who understand the spirit of the present invention can add components within the scope of the same spirit. , changes, deletions, additions, etc. may easily suggest other embodiments, but this will also fall within the scope of the present invention.

Claims (11)

(1) preparing a coating solution containing a liquid titanium alkoxide photocatalyst component at 23 ℃; and
(2) forming a photocatalyst layer by treating and drying the coating solution on the surface of a substrate having a non-porous surface; photocatalyst-based composite manufacturing method comprising a. According to claim 1,
The substrate is a photocatalyst formed including at least one of a metal, a polymer compound, and a ceramic component - a method of manufacturing a substrate composite. According to claim 1,
The coating solution further contains a transition metal component, an acidic solvent and an organic solvent,
Based on the total weight of the coating solution, the total weight of the transition metal component and the acid solvent is 1 to 8% by weight,
Based on the total weight of the coating solution, the organic solvent is contained in an amount of 2 to 5% by weight of the photocatalyst-based composite manufacturing method. According to claim 1,
The content of the titanium alkoxide photocatalyst component in the coating solution is 11 to 15% by weight of the photocatalyst-based composite manufacturing method. According to claim 1,
The titanium alkoxide photocatalyst component is titanium methoxide, titanium ethoxide, titanium tetra n-propoxide, titanium tetraisopropoxide, titanium tetra A method for preparing a photocatalyst-based composite, comprising at least one selected from the group consisting of n-butoxide and titanium tetra tert-butoxide. 3. The method of claim 2,
The transition metal contains at least one selected from the group consisting of silver, palladium, platinum, gold, copper, manganese, iron, nickel, cobalt, tungsten, and the like;
The acidic solvent includes sulfuric acid or nitric acid,
The organic solvent is a photocatalyst containing isopropyl alcohol-based composite manufacturing method. 3. The method of claim 2,
The coating solution is mixed with an acidic solvent and a transition metal in distilled water, followed by stirring at a temperature of 60 ~ 80 ℃;
adding a titanium alkoxide photocatalyst component and an organic solvent and stirring at a temperature of 60 to 80° C. for 6 to 12 hours; and
A method for producing a photocatalyst-based composite, characterized in that it is prepared including; a substrate having a non-porous surface; and
A photocatalyst-based composite comprising a; a photocatalyst layer coated on the non-porous surface and containing a titanium alkoxide component. 9. The method of claim 8,
The photocatalyst layer has a thickness of 0.5 μm or less. 9. The method of claim 8,
The substrate is a photocatalyst-based composite having a plurality of hollow cells through which air can pass. An air purifying device comprising the photocatalyst-based composite according to any one of claims 8 to 10.

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