KR102455126B1 - Photocatalyst composite particle having antibacterial property, and duct for using the same, and method of fabricating of the same - Google Patents

Abstract

A method for producing photocatalyst composite particles having antibacterial properties is provided. The method for producing photocatalyst composite particles having antibacterial properties includes preparing a second source solution by adding a silver precursor solution to a first source solution in which titanium oxide is dispersed, sealing and stirring, and drying the second source solution. to obtain a preliminary composite particle doped with silver particles in the titanium oxide, dispersing the preliminary composite particle in a solvent to prepare a third source solution, adding a platinum precursor solution to the third source solution, , sealing and stirring to prepare a fourth source solution, and drying the fourth source solution to obtain composite particles in which the silver particles and platinum particles are doped into the titanium oxide.

Description

Photocatalyst composite particle having antibacterial property, and duct for using the same, and method of fabricating of the same}

The present application relates to photocatalyst composite particles, and more particularly, to photocatalyst composite particles having antibacterial properties, a duct using the same, and a method for manufacturing the same.

A catalyst is a type of catalyst that changes the reaction rate or improves a reaction without changing itself in a certain chemical reaction. In other words, it uses light as an energy source to promote catalytic reactions to decompose various bacteria and pollutants. As a semiconductor material, titanium dioxide is the most used among photocatalysts due to its acid resistance, alkali resistance, and harmlessness to the human body.

Accordingly, photocatalysts of various structures and compositions have been developed.

For example, in Korean Patent Publication No. 10-2171101, a photocatalyst including nickel titanate (NiTiO ₃ ) doped with niobium (Nb), and the content of niobium in the nickel titanate doped with niobium is nickel titanate 4 parts by weight to 15 parts by weight based on 100 parts by weight of the nate, the photocatalyst is nickel titanium niobium oxide (nickel titanium niobium oxide, Ni _0.5 Ti _0.5 NbO ₄ ) A photocatalyst is disclosed, characterized in that it is formed.

For another example, Republic of Korea Patent Publication No. 10-2164887 has a container formed of a mesh panel at the bottom, a fan for flowing air is formed at the top to have an air purification space therein; an ultraviolet lamp seated on the upper portion of the mesh panel so as to be placed upright in the center of the air purification space; A plurality of photocatalytic filters surround the ultraviolet lamp and are stacked and accommodated in disorder in the air purification space, wherein the photocatalytic filter is a transparent tube having an upper opening hole and a lower opening hole formed at both points of the side walls that are horizontally opposed to each other with respect to the center A hollow substrate including at least one pair of air flow holes formed in pairs in the hollow substrate, and a photocatalyst coated on the inner and outer surfaces of the hollow substrate, the upper opening hole according to the position of each photocatalyst filter stacked in the air purification space , the lower opening hole, and each air flow hole is used as a passage through which the air moving from the lower end to the upper end of the container flows in or out. The air flow holes forming a pair are formed on the side surfaces of the hollow substrate so as to intersect the center line connecting the circle, which is the cross section of the substrate, so that the flow of air passing through the hollow substrate is opposite to the vertical flow passing through the upper and lower ends. Disclosed is a photocatalytic air purification system characterized in that both horizontal flows passing through it are smoothly performed.

One technical problem to be solved by the present application is to provide photocatalytic composite particles having antibacterial properties, a duct using the same, and a method for manufacturing the same.

Another technical problem to be solved by the present application is to provide a photocatalyst composite particle having a simplified manufacturing process and antibacterial properties, a duct using the same, and a manufacturing method thereof.

Another technical problem to be solved by the present application is to provide a photocatalyst composite particle having an antibacterial property with reduced manufacturing cost, a duct using the same, and a manufacturing method thereof.

Another technical problem to be solved by the present application is to provide a photocatalyst composite particle having an antibacterial property that is easy to mass-produce, a duct using the same, and a method for manufacturing the same.

The technical problem to be solved by the present application is not limited to the above.

In order to solve the above technical problem, there is provided a method for producing a photocatalyst composite particle having antibacterial properties.

According to an embodiment, the method for manufacturing the photocatalyst composite particles having antibacterial properties includes the steps of preparing a first source solution in which titanium oxide is dispersed, preparing a silver precursor solution containing silver (Ag), and the first 1 preparing a second source solution by adding the silver precursor solution to the source solution, sealing and stirring, and drying the second source solution to obtain preliminary composite particles in which silver particles are doped into the titanium oxide Step, dispersing the preliminary composite particles in a solvent to prepare a third source solution, preparing a platinum precursor solution containing platinum (Pt), adding the platinum precursor solution to the third source solution, It may include the steps of preparing a fourth source solution by stirring after sealing, and drying the fourth source solution to obtain composite particles in which the silver particles and platinum particles are doped into the titanium oxide.

According to an embodiment, in the composite particle, the silver particle and the platinum particle may include doping with the same wt%.

According to an embodiment, the silver precursor solution may include AgNO ₃ mixed with deionized water, and the platinum precursor solution may include H ₂ PtCl ₆ H ₂ O mixed with deionized water.

According to an embodiment, the first source solution and the silver precursor solution may be stirred using ultrasonic waves, and the third source solution and the platinum precursor solution may be stirred using ultrasonic waves.

In order to solve the above technical problem, the present application provides a method for manufacturing an antibacterial duct.

According to an embodiment, the method for manufacturing the antimicrobial duct includes the steps of preparing the composite particles according to the method for manufacturing the photocatalytic composite particles according to the above-described embodiment, mixing the composite particles with a base solution and a binder, , preparing a coating solution, and providing the coating solution to at least the inner surface of the duct, thereby forming a photocatalytic antibacterial coating layer on at least the inner surface of the duct.

According to an embodiment, the coating solution may further include the preliminary composite particles in which silver is doped into the titanium oxide.

According to an embodiment of the present application, a method for manufacturing a photocatalyst composite particle having antibacterial properties includes the steps of preparing a first source solution in which titanium oxide is dispersed, preparing a silver precursor solution containing silver (Ag), the above preparing a second source solution by adding the silver precursor solution to the first source solution, sealing and stirring, and drying the second source solution to obtain preliminary composite particles in which the titanium oxide is doped with silver particles dispersing the preliminary composite particles in a solvent to prepare a third source solution, preparing a platinum precursor solution containing platinum (Pt), adding the platinum precursor solution to the third source solution, and , sealing and stirring to prepare a fourth source solution, and drying the fourth source solution to obtain composite particles in which the silver particles and platinum particles are doped into the titanium oxide.

The composite particles doped with the silver particles and the platinum particles may have excellent antibacterial properties, and may be easily prepared in a high yield by a simple method. Accordingly, it is possible to provide the composite particle and a method for producing the same, which are easy to mass-produce, reduce the manufacturing cost, and have high antibacterial properties.

In addition, the composite particles may be provided on the inner surface and/or the outer surface of the duct, so that air or indoor air introduced from the outside can be purified by the photocatalytic properties of the composite particles.

1 is a flowchart illustrating a method of manufacturing a photocatalyst composite particle according to an embodiment of the present application.
FIG. 2 is a view for explaining a manufacturing process of a first source solution and a second source solution in a method of manufacturing a photocatalytic composite particle according to an embodiment of the present application.
3 is a view for explaining a preliminary composite particle prepared according to the method of manufacturing the photocatalyst composite particle according to an embodiment of the present application.
4 is a view for explaining a process of manufacturing a third source solution and a fourth source solution in the method for manufacturing the photocatalytic composite particle according to an embodiment of the present application.
5 is a view for explaining the composite particles prepared according to the method of manufacturing the photocatalyst composite particles according to an embodiment of the present application.
6 is a view for explaining a composite particle and a method of manufacturing the same according to a modified example of the embodiment of the present application.
7 is a view for explaining an antibacterial duct using the photocatalyst composite particles according to an embodiment of the present application.
8 is a graph measuring the absorbance of composite particles according to Experimental Examples 1 to 3 of the present application.
9 is a view showing the measurement of decomposition of methylene blue in a halogen lamp environment of composite particles according to Experimental Examples 1 to 3 of the present application.
10 is a view showing the measurement of decomposition of methylene blue in an indoor light environment of composite particles according to Experimental Examples 1 to 3;
11 is a result of testing the antibacterial properties of the composite particles according to Experimental Example 3 against Escherichia coli of the present application.
12 is a result of testing the antibacterial properties of the composite particles according to Experimental Example 3 of the present application against Klebsiella pneumoniae.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the technical spirit of the present invention is not limited to the embodiments described herein and may be embodied in other forms. Rather, the embodiments introduced herein are provided so that the disclosed content may be thorough and complete, and the spirit of the present invention may be sufficiently conveyed to those skilled in the art.

Also, in various embodiments of the present specification, terms such as first, second, third, etc. are used to describe various components, but these components should not be limited by these terms. These terms are only used to distinguish one component from another. Accordingly, what is referred to as a first component in one embodiment may be referred to as a second component in another embodiment. Each embodiment described and illustrated herein also includes a complementary embodiment thereof. In addition, in this specification, 'and/or' is used in the sense of including at least one of the elements listed before and after.

In the specification, the singular expression includes the plural expression unless the context clearly dictates otherwise. In addition, terms such as "comprise" or "have" are intended to designate that a feature, number, step, element, or a combination thereof described in the specification exists, and one or more other features, numbers, steps, or configurations It should not be construed as excluding the possibility of the presence or addition of elements or combinations thereof. In addition, in this specification, "connection" is used in a sense including both indirectly connecting a plurality of components and directly connecting a plurality of components.

In addition, in the following description of the present invention, if it is determined that a detailed description of a related well-known function or configuration may unnecessarily obscure the gist of the present invention, the detailed description thereof will be omitted.

1 is a flowchart for explaining a method of manufacturing a photocatalyst composite particle according to an embodiment of the present application, and FIG. 2 is a first source solution and a second source solution in the manufacturing method of the photocatalyst composite particle according to an embodiment of the present application It is a view for explaining a manufacturing process, FIG. 3 is a view for explaining a preliminary composite particle prepared according to a method for manufacturing a photocatalyst composite particle according to an embodiment of the present application, and FIG. 4 is a photocatalyst according to an embodiment of the present application It is a view for explaining the manufacturing process of the third source solution and the fourth source solution in the manufacturing method of the composite particle, and FIG. 5 is the composite particle manufactured according to the manufacturing method of the photocatalytic composite particle according to an embodiment of the present application. is a drawing for

1 and 2 , the first source solution 110 in which the titanium oxide 210 is dispersed may be prepared ( S110 ).

According to an embodiment, the first source solution 110 may include the titanium oxide 210 dispersed in deionized water. Specifically, after adding the titanium oxide 210 to deionized water, the step of first stirring using ultrasonic waves and the step of second stirring using a stirrer are sequentially performed, and the first source solution 110 is This can be manufactured. Accordingly, the titanium oxide 210 may be substantially uniformly dispersed in the deionized water.

Subsequently, referring to FIGS. 1 and 2 , a silver precursor solution 115 including silver is prepared ( S120 ).

For example, the silver precursor solution 115 may include AgNO ₃ mixed with deionized water.

Continuingly, referring to FIGS. 1 to 3 , the second source solution 120 may be prepared by adding the silver precursor solution 115 to the first source solution 110 , sealing it, and then stirring it ( S130 ). ).

According to an embodiment, the step of stirring after adding the silver precursor solution 115 to the first source solution 110 may be performed using ultrasonic waves. Accordingly, the preliminary composite particles 215 in which the silver particles 220 are doped into the titanium oxide 210 may be manufactured in the first source solution 110 . If, in the step of stirring after adding the silver precursor solution 115 to the first source solution 110 , using a stirrer or excessive stirring, the silver particles are added to the titanium oxide 210 . 220 cannot be easily attached. In other words, even if the silver particles 220 are attached to the titanium oxide 210 during the stirring process, the separation rate increases so that the silver particles 220 cannot be easily doped into the titanium oxide 210. . However, as described above, according to the embodiment of the present application, the step of stirring after adding the silver precursor solution 115 to the first source solution 110 may be performed using ultrasonic waves, and thus The silver particles 220 may be easily attached and doped to the surface of the titanium oxide 210 .

In addition, according to a modified example, the step of adding the silver precursor solution 115 to the first source solution 110 and then stirring the solution may include adding the silver precursor solution 115 to the first source solution 110 and the silver precursor solution 115 . A first stirring step of stirring by placing an ultrasonic vibrator, and placing a polymer pad on the ultrasonicator and placing a container accommodating the first source solution 110 and the silver precursor solution 115 on the polymer pad, It may include agitating the first source solution 110 and the silver precursor solution 115 . Accordingly, separation of the silver particles 220 from the surface of the titanium oxide 210 may be minimized, and thus, the adhesion and doping ratio of the silver particles 220 may be improved.

1 and 3 , the preliminary composite particles 215 in which the silver particles 220 are doped into the titanium oxide 210 may be obtained by drying the second source solution 120 ( S140 ). ).

The obtained preliminary composite particles 215 may be dried.

According to an embodiment, in this case, the preliminary composite particles 215 may be semi-dried. In other words, the preliminary composite particles 215 are not completely dried, and the remaining deionized water may be provided to the container in which the preliminary composite particles 215 are accommodated. Accordingly, the silver particles 220 are not separated from the titanium oxide 210 and can easily maintain an attached state.

Alternatively, according to another embodiment, the obtained preliminary composite particles 215 may be completely dried, and in this case, the completely dried preliminary composite particles 215 may be provided with a complementary solvent, and thus, the Separation of the silver particles 220 of the preliminary composite particles 215 from the titanium oxide 210 may be minimized. For example, the complementary solvent may be water or ethanol.

1 and 4 , the third source solution 130 may be prepared by dispersing the preliminary composite particles 215 in a solvent (S150).

According to an embodiment, the third source solution 130 may include a dispersion of the preliminary composite particles 215 in the solvent (eg, deionized water). Specifically, after adding the preliminary composite particles 215 to the solvent, the step of first stirring using ultrasonic waves and the step of second stirring using a stirrer are sequentially performed, so that the third source solution 130 ) can be prepared. Accordingly, the preliminary composite particles 215 may be substantially uniformly dispersed in the solvent.

Subsequently, referring to FIGS. 1 and 4 , a platinum precursor solution 125 containing platinum is prepared ( S160 ).

For example, the platinum precursor solution may include a mixture of H ₂ PtCl ₆ H ₂ O in deionized water.

Continuingly, referring to FIGS. 1, 4, and 5 , the platinum precursor solution 135 is added to the third source solution 130 , sealed, and stirred to prepare a fourth source solution 140 . It can be (S170).

According to an embodiment, the step of stirring after adding the platinum precursor solution 135 to the third source solution 130 may be performed using ultrasonic waves. Accordingly, the composite particles 235 in which the silver particles 220 and the platinum particles 230 are doped into the titanium oxide 210 may be manufactured in the third source solution 130 . If, in the step of stirring after adding the platinum precursor solution 135 to the third source solution 130 , stirring is performed using a stirrer or excessively stirring, the silver particles in the titanium oxide 210 are 220 and the platinum particles 230 cannot be easily attached. In other words, even if the silver particles 220 and the platinum particles 230 are attached to the titanium oxide 210 during the stirring process, the separation ratio increases to increase the separation ratio of the silver particles 220 and the platinum particles 230 . may not be easily doped into the titanium oxide 210 . However, as described above, according to an embodiment of the present application, the step of stirring after adding the platinum precursor solution 135 to the third source solution 130 may be performed using ultrasonic waves, and thus The silver particles 220 and the platinum particles 230 may be easily attached and doped to the surface of the titanium oxide 210 .

In addition, according to one modification, the step of stirring after adding the platinum precursor solution 135 to the third source solution 130 includes the third source solution 130 and the platinum precursor solution 135 . A first stirring step of stirring by placing an ultrasonic vibrator, and placing a polymer pad on the ultrasonicator and placing a container accommodating the third source solution 130 and the platinum precursor solution 135 on the polymer pad, It may include agitating the third source solution 130 and the platinum precursor solution 135 . Accordingly, separation of the silver particles 220 and the platinum particles 230 from the surface of the titanium oxide 210 can be minimized, and thus the silver particles 220 and the platinum particles 230 are minimized. The rate of adhesion and doping can be improved.

1 and 5 , the composite particles 235 in which the silver particles 220 and the platinum particles 230 are doped into the titanium oxide 210 by drying the fourth source solution 140 . can be obtained (S180).

The obtained composite particles 235 may be dried.

According to an embodiment, in this case, the composite particles 235 may be semi-dried. In other words, the composite particles 235 are not completely dried, and the remaining deionized water may be provided to the container in which the composite particles 235 are accommodated. Accordingly, the silver particles 220 and the platinum particles 230 are not separated from the titanium oxide 210 , and an attached state may be easily maintained.

Alternatively, according to another embodiment, the obtained composite particles 235 may be completely dried, in this case, the completely dried composite particles 235 may be provided with a complementary solvent, and thus, the composite particles 235 Separation of the silver particles 220 and the platinum particles 230 of 235 from the titanium oxide 210 may be minimized. For example, the complementary solvent may be water or ethanol.

In addition, as described above, according to an embodiment of the present application, according to a ratio of adding the silver precursor solution 115 to the first source solution 110 , the composite particles 235 to the silver particles 220 . ) to the titanium oxide 210 by weight ratio (wt%) can be controlled, and according to the ratio of adding the platinum precursor solution 135 to the third source solution 130, the composite particles 235 A weight ratio (wt%) of the platinum particles 230 to the titanium oxide 210 may be controlled.

If, unlike described above, when a powder containing silver and platinum is used to dope silver and platinum on the titanium oxide 210 , doping a small amount of silver and platinum on the titanium oxide 210 is Not easy.

However, as described above, according to the embodiment of the present application, the titanium oxide 210 is dispersed in the silver precursor solution 115 diluted with deionized water and the platinum precursor solution 135 diluted with deionized water. added to the solution, whereby the weight ratio of the silver particles 210 and the platinum particles 230 doped to the composite particles 235 can be finely and easily controlled.

6 is a view for explaining a composite particle and a method of manufacturing the same according to a modified example of the embodiment of the present application.

Referring to FIG. 6 , the composite particle 255 according to a modified example of the embodiment of the present application may include a titanium oxide 210 and platinum particles 230 coated on the surface of the titanium oxide 210 .

The manufacturing method of the composite particle 255 includes the steps of preparing the first source solution 110 in which the titanium oxide 210 is dispersed as described with reference to FIG. 1 , the dwelling described with reference to FIG. Preparing the platinum precursor solution 125 as described above, adding the platinum precursor solution 125 to the first source solution 110 as described with reference to FIG. 1, sealing and stirring to prepare a source solution and drying the source solution to obtain the composite particles 255 . In other words, the process described with reference to FIGS. 1 to 5 is performed, using the titanium oxide 210 and the sprayed first source solution 110 and the platinum precursor solution 125 , the titanium oxide The composite particle 255 in which the platinum particle 230 is coated on the surface of the 210 may be manufactured.

7 is a view for explaining an antibacterial duct using the photocatalyst composite particles according to an embodiment of the present application.

Referring to FIG. 7 , the manufacturing of the antimicrobial duct 300 according to the embodiment of the present application includes manufacturing the composite particles 235 according to the method described with reference to FIGS. 1 to 5 , the Mixing the composite particles 235 with a base solution and a binder to prepare a coating solution, and providing the coating solution to the inner and/or outer surfaces of the duct to form a photocatalytic antibacterial coating layer on the inner and/or outer surfaces of the duct ( It may include the step of forming 310, 320).

Alternatively, the manufacturing of the antibacterial duct 300 may include preparing the composite particles 255 according to the method described with reference to FIG. 6 , and mixing the composite particles 255 with a base solution and a binder. to prepare a coating solution, and providing the coating solution to the inner and/or outer surfaces of the duct to form photocatalytic antibacterial coating layers 310 and 320 on the inner and/or outer surfaces of the duct. .

The coating solution may be coated by various methods such as an impregnation method, spray coating, and the like.

Also, according to an embodiment, a first photocatalytic antibacterial coating layer 310 may be formed on the inner surface of the antimicrobial duct 300 , and a second photocatalytic antibacterial coating layer 320 on the outer surface of the antimicrobial duct 300 . can be formed. The first photocatalytic antimicrobial coating layer 310 is a composite particle 235 in which the silver particles 220 and the platinum particles 230 are doped into the titanium oxide 210 described with reference to FIGS. 1 to 5 , hereinafter, first composite particles), and the second photocatalytic antibacterial coating layer 320 is a composite particle 255 in which the platinum particles 230 are doped into the titanium oxide 210 described with reference to FIG. 6 . , second composite particles). As will be described later, the first composite particles 235 may have high photolysis characteristics in an environment irradiated with a halogen lamp, and the second composite particles 255 may exhibit high photolysis characteristics in an environment irradiated with general indoor light. can have

In addition, in this case, the second photocatalytic antibacterial coating layer 320 is a preliminary composite particle 215 (hereinafter referred to as a third composite particle) in which the silver particle 220 is doped into the titanium oxide 210 described with reference to FIG. 1 . ) may be further included. The third composite particle 215 may have a high absorbance as will be described later, so that the second composite particle 255 may further improve photocatalytic properties in an environment irradiated with general indoor light.

The recent trend of interior decoration is to install the duct outside the wall or ceiling instead of hiding it by embedding it inside the wall or ceiling and use it as an interior tool.

Accordingly, as described above, the first photocatalytic antimicrobial coating layer 310 having the first composite particles 235 is provided on the inner surface of the antimicrobial duct 300 , and When the second photocatalytic antibacterial coating layer 320 having the second composite particles 255 is provided on the outer surface, and the antibacterial duct 300 is exposed to the outside according to an indoor interior trend, the antibacterial duct The second photocatalyst antibacterial coating layer 320 provided on the outer surface of 300 can purify indoor air by realizing high photocatalytic properties by indoor light, and a halogen lamp is installed inside the antibacterial duct 300 . The first photocatalytic antibacterial coating layer 310 provided on the inner surface of the antibacterial duct 300 by being installed realizes high photocatalytic properties by a halogen lamp to purify the air flowing in from the outside, as well as the antibacterial property. An aesthetic interior effect can be realized by the light of a halogen lamp installed on the inner surface of the duct 300 .

Hereinafter, specific experimental examples of the present application and characteristic evaluation results thereof will be described.

Preparation of composite particles according to Experimental Example 1

A first source solution was prepared by preparing titanium oxide, mixing 5 g of titanium oxide in 300 ml of deionized water, and stirring each for 30 minutes using ultrasonic waves and a stirrer.

0.016 g of AgNO ₃ was mixed with 40 ml of deionized water to prepare a silver precursor solution, and 0.027 g of H ₂ PtCl ₆ H ₂ O was mixed with 40 ml of deionized water to prepare a platinum precursor solution.

A second source solution was prepared by adding 1 ml of the silver precursor solution to the first source solution, and the second source solution was sealed and stirred for 1 hour and 30 minutes using ultrasonic waves.

Thereafter, the second source solution was dried in an oven at 80° C. to prepare preliminary composite particles in which silver particles were doped into titanium oxide.

The preliminary composite particles were added to 300 ml of deionized water and stirred to prepare a third source solution, and 1 ml of the platinum precursor solution was added to the third source solution to prepare a fourth source solution.

The fourth source solution was dried in an oven at 80° C. to prepare composite particles according to Experimental Example 1 in which titanium oxide was doped with silver particles and platinum particles at the same weight ratio by 0.5 wt% compared to titanium oxide.

Preparation of composite particles according to Experimental Example 2

In the same manner as in Experimental Example 1 described above. Preliminary composite particles in which titanium oxide is doped with silver particles were prepared as composite particles according to Experimental Example 2.

Preparation of composite particles according to Experimental Example 3

In the same manner as in Experimental Example 1 described above, the first source solution and the platinum precursor solution were prepared, 1 ml of the platinum precursor solution was added to the first source solution, sealed, and then sealed using ultrasound for 1 hour 30 stirred for minutes.

Thereafter, the composite particles according to Experimental Example 3 were prepared by drying in an oven at 80° C. in which platinum particles were doped into titanium oxide.

The structures of the composite particles according to Experimental Examples 1 to 3 are as follows.

division composite particle structure Experimental Example 1 Titanium Oxide - Silver & Platinum Particles Experimental Example 2 Titanium Oxide - Silver Particles Experimental Example 3 Titanium Oxide - Platinum Particles

8 is a graph measuring absorbance of composite particles according to Experimental Examples 1 to 3 of the present application.

Referring to FIG. 8 , the absorbance according to wavelength was measured for the composite particles according to Experimental Examples 1 to 3, and titanium oxide.

As can be seen in FIG. 8 , it can be seen that the absorbance is increased when silver particles or platinum particles are doped, compared to titanium oxide in which silver particles or platinum particles are not doped.

In addition, it can be seen that in Experimental Example 2 and Experimental Example 4 in which silver particles are doped, absorbance is higher than that in Experimental Example 3 doped with platinum particles.

9 is a measurement of decomposition of methylene blue in a halogen lamp environment of the composite particles according to Experimental Examples 1 to 3 of the present application, and FIG. 10 is an indoor light environment of the composite particles according to Experimental Examples 1 to 3 of the present application. The degree of decomposition of methylene blue was measured.

9 and 10 , the decomposition degree of methylene blue of the composite particles according to Experimental Examples 1 to 3 was measured in a halogen lamp environment, and the composite particles according to Experimental Examples 1 to 3 in an environment in an indoor light environment. And the degree of decomposition of methylene blue of titanium oxide was measured.

As can be seen from FIG. 9 , in a halogen lamp environment, silver particles of Experimental Example 2 were compared with composite particles having doped titanium oxide and platinum particles of Experimental Example 3 having titanium oxide doped. It can be seen that the composite particles of Experimental Example 1 having titanium oxide doped with silver particles and platinum particles have the highest photocatalytic properties.

In addition, as can be seen in FIG. 10 , in an indoor light environment, titanium oxide undoped with silver particles and platinum particles, composite particles having titanium oxide doped with silver particles of Experimental Example 2, and silver particles of Experimental Example 1 and It can be seen that the composite particles having titanium oxide doped with platinum particles of Experimental Example 3 have the highest photocatalytic properties compared to the composite particles having titanium oxide doped with platinum particles.

11 is a result of testing the antibacterial properties of the composite particles according to Experimental Example 3 of the present application against Escherichia coli, and FIG. 12 is Klebsiella pneumoniae of the composite particles according to Experimental Example 3 of the present application. It is the result of an antibacterial test against

11 and 12 , an antibacterial test against Escherichia coli and Streptococcus pneumoniae was performed on the composite particles including titanium oxide doped with silver particles and platinum particles according to Experimental Example 3. 11 (a) and 12 (b) are cases in which the composite particle according to Experimental Example 3 of the present application is not applied, and FIGS. 11 (b) and 12 (b) are experimental examples of the present application This is the case where the composite particle according to 3 is applied. The initial number of E. coli and Pneumococcus pneumoniae was 1.2 x 104, left for 24 hours, the sample size was 50 mm x 50 mm, the inoculation amount was 0.4 ml, and the number of bacteria was measured at about 35 ° C. R.H 90%.

As can be seen in FIGS. 11 and 12 , it can be confirmed that the composite particles according to Experimental Example 3 of the present application have excellent antibacterial properties of 99.9% against Escherichia coli and Streptococcus pneumoniae.

As mentioned above, although the present invention has been described in detail using preferred embodiments, the scope of the present invention is not limited to specific embodiments and should be construed according to the appended claims. In addition, those skilled in the art should understand that many modifications and variations are possible without departing from the scope of the present invention.

110: first source solution
115: silver precursor solution
120: second source solution
130: third source solution
135: platinum precursor solution
140: fourth source solution
210: titanium oxide
215: preliminary composite particles
220: silver particles
230: platinum particles
235: composite particles

Claims (6)

preparing a first source solution in which titanium oxide is dispersed;
preparing a silver precursor solution containing silver (Ag);
preparing a second source solution by adding the silver precursor solution to the first source solution, sealing the solution, and then stirring;
drying the second source solution to obtain preliminary composite particles in which silver particles are doped into the titanium oxide;
dispersing the preliminary composite particles in a solvent to prepare a third source solution;
preparing a platinum precursor solution containing platinum (Pt);
adding the platinum precursor solution to the third source solution, sealing the solution, and then stirring to prepare a fourth source solution; and
drying the fourth source solution to obtain composite particles in which the silver particles and platinum particles are doped into the titanium oxide,
The first source solution and the silver precursor solution are stirred using ultrasonic waves,
and wherein the third source solution and the platinum precursor solution are stirred using ultrasonic waves.
The method of claim 1,
and wherein in the composite particles, the silver particles and the platinum particles are doped with the same wt%.
The method of claim 1,
The silver precursor solution includes AgNO ₃ mixed with deionized water,
The platinum precursor solution is H ₂ PtCl ₆ H ₂ O Method for producing a photocatalyst composite particle comprising a mixture of deionized water.
delete According to the method for producing the photocatalyst composite particles according to claim 1, comprising the steps of: preparing the composite particles;
mixing the composite particles with a base solution and a binder to prepare a coating solution; and
and providing the coating solution on at least an inner surface of the duct to form a photocatalytic antibacterial coating layer on at least the inner surface of the duct.
6. The method of claim 5,
The coating solution, the method of manufacturing an antimicrobial duct further comprising the preliminary composite particles doped with silver in the titanium oxide.

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