Ceramic composite photocatalyst having titanium dioxide nanowires formed on surface thereof and manufacturing method thereof

Abstract

The present invention relates to a ceramic composite photocatalyst having titanium dioxide nanowires formed on the surface thereof and a manufacturing method thereof and, more specifically, to a ceramic composite photocatalyst having titanium dioxide nanowires formed on the surface thereof and a manufacturing method thereof, the titanium dioxide nanowires exhibiting excellent photocatalytic performance by growing titanium dioxide (TiO2) on the surface of a ceramic microstructure through a hydrothermal synthesis process.

Description

Ceramic composite photocatalyst having titanium dioxide nanowires formed on the surface and method for manufacturing the same

[0001] The present invention relates to a ceramic composite photocatalyst having titanium dioxide nanowires formed on the surface and a method for producing the same, and more specifically, to a ceramic composite photocatalyst having titanium dioxide nanowires formed on the surface, which exhibit excellent photocatalytic performance, by growing titanium dioxide (TiO2) on the surface of a ceramic microstructure through a hydrothermal synthesis process, and a method for producing the same.

[0002]

[0003] Deteriorating air quality caused by a wide range of gaseous organic and inorganic chemical pollutants, such as carbon monoxide (CO), volatile organic compounds (VOCs), and nitrogen oxides (NOx); biochemical pollutants such as bacteria, viruses, and fungi; and organic and inorganic particles is accelerating the worsening of climate change, as well as respiratory and pulmonary diseases. Photocatalysis is emerging as a key technology for improving air quality and mitigating the impact of these pollutants.

[0004] Typically, when titanium dioxide (TiO2) photocatalysts are exposed to UV irradiation with wavelengths and energies exceeding the band gap of titanium dioxide via sunlight, the photocatalyst generates free electrons and holes on its surface. These reactive species interact with oxygen or water molecules to form OH - and O2 radicals are formed. These reactive species, particularly OH radicals with strong oxidizing properties, are highly effective in decomposing bacteria and pathogens attached to surfaces. Therefore, active research is being conducted to increase the specific surface area of ​​titanium dioxide photocatalysts to enhance their efficiency.

[0005] Titanium dioxide photocatalysts have attracted attention as an eco-friendly solution for air purification, water purification, deodorization, and antibacterial applications. Titanium dioxide photocatalysts exhibit excellent adaptability, enabling them to be applied in a wide range of applications, from large-scale industrial processes like factory wastewater treatment and air purification to personal applications like the removal of aromatic organic odors and cigarette smoke. However, when these photocatalysts are used for water purification, the recovery of the photocatalyst particles after the reaction is difficult.

[0006] Due to the limitations described above, there is a need to develop a titanium dioxide photocatalyst that has a large surface area for high photocatalytic efficiency while simultaneously suppressing the separation of photocatalytic particles after use in water.

[0007]

[0008] The present invention aims to solve the above problems by providing a ceramic composite photocatalyst having titanium dioxide nanowires formed on the surface, which exhibit excellent photocatalytic performance through a large surface area and at the same time suppress the separation of photocatalytic particles after use in water through a structure in which titanium dioxide is grown on the surface rather than a simple coating structure, and a method for producing the same.

[0009] The technical problems to be solved by the present invention are not limited to the technical problems mentioned above, and other technical problems not mentioned can be clearly understood by a person having ordinary skill in the art from the description of the present invention.

[0010]

[0011] In order to achieve the above object, the present invention provides a ceramic composite photocatalyst comprising a core layer; a boundary layer; and a surface layer, wherein the core layer includes titanium dioxide nanoparticles, and the surface layer includes titanium dioxide nanowires formed by the titanium dioxide nanoparticles included in the core layer moving to the surface and then growing, wherein titanium dioxide nanowires are formed on the surface.

[0012] In the present invention, the core layer is characterized by including a photocatalytic composition including titanium dioxide nanoparticles, ceramic powder, a photocurable polymer, a photoinitiator, and a light absorber.

[0013] In the present invention, the photocatalytic composition is characterized in that it comprises 5 to 20 wt% of the titanium dioxide nanoparticles, 5 to 20 wt% of the ceramic powder, 60 to 90 wt% of the photocurable polymer, 0.2 to 0.8 wt% of the photoinitiator, and 0.002 to 0.008 wt% of the light absorber, relative to 100 wt% of the photocatalytic composition.

[0014] In the present invention, the titanium dioxide nanowire is characterized by being in the anatase phase and having a diameter of 100 to 250 nm.

[0015] The present invention relates to a method for producing a ceramic composite photocatalyst having titanium dioxide nanowires formed on a surface, the method comprising the steps of: producing a photocatalyst composition; photocuring the photocatalyst composition to produce a photocatalyst; and hydrothermally synthesizing the cured photocatalyst.

[0016] In the present invention, the step of preparing the photocatalytic composition is characterized by including the steps of: preparing a ceramic slurry by mixing ceramic particles with a photocurable polymer; and preparing a photocatalytic composition by mixing a photoinitiator, a light absorber, and titanium dioxide nanoparticles into the ceramic slurry.

[0017] In the present invention, the step of preparing the photocatalytic composition is characterized by preparing a photocatalytic composition including 5 to 20 wt% of the titanium dioxide particles, 5 to 20 wt% of the ceramic particles, 60 to 90 wt% of the photocurable polymer, 0.2 to 0.8 wt% of the photoinitiator, and 0.002 to 0.008 wt% of the light absorber, relative to 100 wt% of the photocatalytic composition.

[0018] In the present invention, the step of producing a photocatalyst by photocuring is characterized by irradiating the photocatalyst composition with UV light of 350 to 450 nm.

[0019] In the present invention, the hydrothermal synthesis step is characterized by including: a step of adding diethylene glycol to distilled water; a step of adding potassium titanium oxalate to the solvent to which the diethylene glycol has been added and stirring to prepare a mixed solvent; a step of adding the cured photocatalyst to the mixed solvent and then heating to form titanium dioxide nanowires; a step of cooling the photocatalyst on which the titanium dioxide nanowires have been formed; and a step of washing and drying the cooled photocatalyst on which the titanium dioxide nanowires have been formed.

[0020] In the present invention, the step of forming titanium dioxide nanowires by heating is characterized by heating at 150 to 200°C for 10 to 14 hours.

[0021]

[0022] By means of solving the above problem, the present invention can provide a ceramic composite photocatalyst and a method for manufacturing the same, in which titanium dioxide nanowires are formed on the surface, which exhibit excellent photocatalytic performance through a large specific surface area and at the same time suppress the separation of photocatalytic particles after use in water through a structure in which titanium dioxide is grown on the surface rather than a simple coating structure.

[0023] In addition, the present invention can provide a ceramic composite photocatalyst and a method for manufacturing the same, in which titanium dioxide nanowires are formed on the surface, which can suppress separation of titanium dioxide from the surface, thereby eliminating the need for an additional purification step and reducing the risk of secondary contamination due to nanomaterials dispersed in water.

[0024] In addition, the present invention can provide a photocatalyst exhibiting high efficiency and ease of dispersion and recovery process.

[0025] In addition, the present invention provides a nano-sized photocatalyst and a method for manufacturing the same, which can provide simple installation, transfer, and operation, and can significantly reduce the risk of secondary pollution caused by nanomaterials in an aquatic environment.

[0026] In addition, the present invention can provide a photocatalyst and a method for producing the same that can be applied to various fields including hydrogen production, water decomposition, CO2 capture, and biomedicine.

[0027] The effects of the present invention are not limited to the effects mentioned above, and other effects not mentioned will be clearly understood by those skilled in the art from the description of the claims.

[0028]

[0029] Figure 1 is a drawing showing the structure of a ceramic composite photocatalyst having titanium dioxide nanowires formed on the surface according to the present invention.

[0030] FIG. 2 is a drawing showing the structure and photocatalytic principle of a ceramic composite photocatalyst having titanium dioxide nanowires formed on the surface according to the present invention.

[0031] Figure 3 is a drawing showing the manufacturing process of a ceramic composite photocatalyst having titanium dioxide nanowires formed on the surface according to the present invention.

[0032] Figure 4 is a drawing showing the results of SEM photography of a cross-section of a ceramic composite having titanium dioxide nanowires formed on the surface according to the present invention.

[0033] Figure 5 is a drawing showing the results of SEM photography of the surface of examples and comparative examples according to the present invention.

[0034] Figure 6 is a drawing showing the EDS analysis results of the surface of examples and comparative examples according to the present invention.

[0035] Figure 7 is a drawing showing the results of XRD analysis of the surface of examples and comparative examples according to the present invention.

[0036] Figure 8 is a drawing showing the results of TEM analysis of the surface of an embodiment according to the present invention.

[0037] [Correction pursuant to Rule 91, 29.11.2024][Deleted]

[0038]

[0039] The terms used in this specification have been selected from widely used, current terms, taking into account the functions of the present invention. However, these terms may vary depending on the intentions of those skilled in the art, precedents, the emergence of new technologies, etc. Furthermore, in certain cases, terms may be arbitrarily selected by the applicant, in which case their meanings will be described in detail in the relevant description of the invention. Therefore, the terms used in this invention should not be defined simply as names, but rather based on their inherent meanings and the overall content of the present invention.

[0040] Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. Terms defined in commonly used dictionaries should be interpreted as having a meaning consistent with their meaning in the context of the relevant technology, and will not be interpreted in an idealized or overly formal sense unless explicitly defined herein.

[0041] Numerical ranges are inclusive of the values ​​defined in the ranges above. Any maximum numerical limitation given throughout this specification includes any lower numerical limitation, as if that lower numerical limitation were explicitly stated. Any minimum numerical limitation given throughout this specification includes any higher numerical limitation, as if that higher numerical limitation were explicitly stated. Any numerical limitation given throughout this specification will include any better numerical range within the broader numerical range, as if that narrower numerical limitation were explicitly stated.

[0042]

[0043] Ceramic composite photocatalyst with titanium dioxide nanowires formed on the surface

[0044] The present invention relates to a ceramic composite photocatalyst having titanium dioxide nanowires formed on the surface.

[0045] The present invention relates to a ceramic composite photocatalyst comprising a core layer; a boundary layer; and a surface layer; wherein the core layer comprises titanium dioxide nanoparticles, and the surface layer comprises titanium dioxide nanowires formed by the titanium dioxide nanoparticles included in the core layer moving to the surface and then growing, and wherein titanium dioxide nanowires are formed on the surface.

[0046] The above ceramic composite photocatalyst may exhibit a large specific surface area and high bonding properties of the core layer and the surface layer, as a result of titanium dioxide nanoparticles of the core layer migrating to the surface and then growing to form a surface layer, rather than a structure in which titanium dioxide is simply coated on the surface. The above ceramic composite photocatalyst may exhibit excellent photocatalytic performance, including the decomposition of nitrogen oxides (NOx) and volatile organic compounds (VOCs) in the atmosphere, as shown in Fig. 2, due to the large specific surface area. At the same time, the high bonding properties may prevent particle separation even after use in water, eliminating the need for an additional purification step and reducing concerns about secondary contamination due to nanomaterials dispersed in water, making it suitable for use in water.

[0047] The core layer may be a catalyst region formed by photo-curing before hydrothermal synthesis, the boundary layer may be the outermost boundary region of the catalyst, and the surface layer may be a region where titanium dioxide nanowires are formed after hydrothermal synthesis. Even after the titanium dioxide particles of the core layer move and grow to the surface layer, some titanium dioxide particles may be included in the core layer. In the composite photocatalyst, the core layer, boundary layer, and surface layer are clearly identified, but are not separated.

[0048] In the present invention, the core layer may include a photocatalytic composition including titanium dioxide nanoparticles, ceramic powder, a photocurable polymer, a photoinitiator, and a light absorber.

[0049] The above titanium dioxide nanoparticles may be dispersed and exhibit high reactivity to UV light, and may preferably be titanium oxide having an average particle size of 40 to 50 μm, but is not limited thereto. The photoinitiator may facilitate the reaction under UV light. The light absorber may be for improving the precision of catalyst production, and may preferably be 1-phenylazo-2-naphthol, but is not limited thereto.

[0050] In the present invention, the photocatalytic composition may include 5 to 20 wt% of the titanium dioxide nanoparticles, 5 to 20 wt% of the ceramic powder, 60 to 90 wt% of the photocurable polymer, 0.2 to 0.8 wt% of the photoinitiator, and 0.002 to 0.008 wt% of the light absorber, relative to 100 wt% of the photocatalytic composition.

[0051] If the titanium dioxide nanoparticles are included in an amount of less than 5 wt%, the catalytic performance of the photocatalyst produced may be degraded, and if they are included in an amount exceeding 20 wt%, the durability of the photocatalyst may be degraded. If the ceramic powder is included in an amount of less than 5 wt%, the durability of the photocatalyst may be degraded.

[0052] In the present invention, the titanium dioxide nanowire may be in the anatase phase and have a diameter of 100 to 250 nm.

[0053]

[0054] Method for manufacturing a ceramic composite photocatalyst having titanium dioxide nanowires formed on the surface

[0055] The present invention relates to a method for manufacturing a ceramic composite photocatalyst having titanium dioxide nanowires formed on the surface.

[0056] The present invention relates to a method for producing a ceramic composite photocatalyst having titanium dioxide nanowires formed on a surface, the method comprising the steps of: producing a photocatalyst composition; photocuring the photocatalyst composition to produce a photocatalyst; and hydrothermally synthesizing the cured photocatalyst.

[0057] The above manufacturing method may be a method for manufacturing a photocatalyst that exhibits a large surface area and high bonding strength between the core layer and the surface layer, in which titanium dioxide nanoparticles are simply transferred to the surface through photocuring and hydrothermal synthesis, and then titanium dioxide nanowires are formed through growth.

[0058] A photocatalyst manufactured according to the above manufacturing method includes a core layer; a boundary layer; and a surface layer; wherein the core layer includes titanium dioxide nanoparticles, and the surface layer includes titanium dioxide nanowires formed by the titanium dioxide nanoparticles included in the core layer moving to the surface and then growing, and may be a ceramic composite photocatalyst having titanium dioxide nanowires formed on the surface.

[0059] In the present invention, the step of preparing the photocatalytic composition may include a step of preparing a ceramic slurry by mixing ceramic particles with a photocurable polymer; and a step of preparing a photocatalytic composition by mixing a photoinitiator, a light absorber, and titanium dioxide nanoparticles into the ceramic slurry.

[0060] The above titanium dioxide nanoparticles may be dispersed and exhibit high reactivity to UV light, and may preferably be titanium oxide having an average particle size of 40 to 50 μm, but is not limited thereto. The photoinitiator may facilitate the reaction under UV light. The light absorber may be for improving the precision of catalyst production, and may preferably be 1-phenylazo-2-naphthol, but is not limited thereto.

[0061] In the present invention, the step of preparing the photocatalytic composition may be to prepare a photocatalytic composition including 5 to 20 wt% of the titanium dioxide particles, 5 to 20 wt% of the ceramic particles, 60 to 90 wt% of the photocurable polymer, 0.2 to 0.8 wt% of the photoinitiator, and 0.002 to 0.008 wt% of the light absorber, relative to 100 wt% of the photocatalytic composition.

[0062] If the titanium dioxide nanoparticles are included in an amount of less than 5 wt%, the catalytic performance of the photocatalyst produced may be degraded, and if they are included in an amount exceeding 20 wt%, the durability of the photocatalyst may be degraded. If the ceramic powder is included in an amount of less than 5 wt%, the durability of the photocatalyst may be degraded.

[0063] In the present invention, the step of producing a photocatalyst by photocuring may be irradiating the photocatalyst composition with UV light of 350 to 450 nm. The UV light range may have a wavelength and energy exceeding the band gap of titanium dioxide. The step of producing a photocatalyst by photocuring may be performed using, but is not limited to, a photocuring 3D printing technology.

[0064] In the present invention, the hydrothermal synthesis step may include: a step of adding diethylene glycol to distilled water; a step of adding potassium titanium oxalate to the solvent to which the diethylene glycol has been added and stirring to prepare a mixed solvent; a step of adding the cured photocatalyst to the mixed solvent and then heating to form titanium dioxide nanowires; a step of cooling the photocatalyst on which the titanium dioxide nanowires have been formed; and a step of washing and drying the cooled photocatalyst on which the titanium dioxide nanowires have been formed.

[0065] The above potassium titanium oxalate (PTO, K2TiO2(C2O4)2) may provide a source of titanium ions essential for the formation of the titanium dioxide nanowires. The diethylene glycol (DEG) may simultaneously function as a photocatalyst and a stabilizer of the mixed solvent to control growth kinetics and determine the morphological characteristics of the titanium dioxide nanowires. Through this, the titanium dioxide nanocrystals may grow through a directional aggregation mechanism, and the nanocrystals may be aligned in a specific direction and aggregate with each other to form long and uniform nanowires.

[0066] The formation of the above nanowires may be driven by hydrolysis of the potassium titanium oxalate in an environment rich in the diethylene glycol, wherein the hydrolysis reaction results in the formation of titanium hydroxide (TiO(OH)2) and oxalic acid (H2C2O4), and the titanium hydroxide may be precipitated in the mixed solvent to form nanowires.

[0067] In the present invention, the step of forming titanium dioxide nanowires by heating may be heating at 150 to 200°C for 10 to 14 hours. The heating range may be maintained above the boiling point of the cured photocatalyst to improve the solubility and reactivity of the precursor, thereby facilitating the formation of titanium dioxide nanowires. In addition, it may be for producing titanium dioxide in anatase phase that is stable in the temperature range. If heating is performed below the temperature range, the boiling point of the cured photocatalyst may not be reached, which may cause a problem in that the titanium dioxide nanoparticles may not grow into nanowires, and if heating is performed above the temperature range, the mechanical properties of the photocatalyst may be deteriorated. If heating is performed below the heating time range, the titanium dioxide nanoparticles may not sufficiently aggregate and grow, which may cause a problem in that they may not grow into nanowires, and if heating is performed above the heating time range, the mechanical properties of the photocatalyst may be deteriorated.

[0068]

[0069] Example

[0070] Hereinafter, examples of the present invention will be described in detail, but it is obvious that the present invention is not limited to the following examples.

[0071] The advantages and features of the present invention, and the methods for achieving them, will become clearer with reference to the embodiments described in detail below. However, the present invention is not limited to the embodiments disclosed below and may be implemented in various different forms. The embodiments are provided solely to ensure that the disclosure of the present invention is complete and to fully inform those skilled in the art of the scope of the invention. The present invention is defined solely by the scope of the claims.

[0072]

[0073] <Example 1> Ceramic composite photocatalyst with titanium dioxide nanowires formed on the surface

[0074] A ceramic slurry was prepared by mixing titanium dioxide powder, which is a ceramic particle having an average particle size of about 45 μm, with PEGDA, which is a photocurable polymer. A photocatalytic composition was prepared by mixing a photoinitiator, a light absorber, sudan I, and dispersed titanium dioxide nanoparticles into the ceramic slurry, and the photocatalytic composition comprises 20 wt% of the titanium dioxide particles, 20 wt% of the ceramic particles, 59 wt% of the photocurable polymer, 0.5 wt% of the photoinitiator, and 0.005 wt% of the light absorber, based on 100 wt% of the photocatalytic composition.

[0075] The photocatalyst composition was photocured using a UV-visible 3D printer to produce a photocatalyst. The photocatalyst was added to a solvent containing 0.7 g of potassium titanium oxalate (PTO, K2TiO(C2O4)2) and 10 mL of diethylene glycol (DEG) and deionized water (DI), and stirred for 1 hour. The mixture prepared by the stirring was transferred to a Teflon-lined stainless steel autoclave and heated at 180°C for 12 hours to form titanium dioxide nanowires on the surface of the photocatalyst. After the reaction, the mixture containing the photocatalyst with the titanium dioxide nanowires formed was taken out of the autoclave and cooled to room temperature. Thereafter, the photocatalyst with the titanium dioxide nanowires formed was extracted from the mixture, washed with deionized water and ethanol, and naturally dried at room temperature to produce a ceramic composite photocatalyst with titanium dioxide nanowires formed on the surface.

[0076]

[0077] <Comparative Example 1-1> Ceramic photocatalyst without hydrothermal synthesis

[0078] A ceramic slurry was prepared by mixing titanium dioxide powder, which is a ceramic particle having an average particle size of about 45 μm, with a photocurable polymer, PEGDA. A photocatalytic composition was prepared by mixing a photoinitiator, a light absorber, sudan I, and dispersed titanium dioxide nanoparticles into the ceramic slurry. The photocatalytic composition contained 20 wt% of the titanium dioxide particles, 20 wt% of the ceramic particles, 59 wt% of the photocurable polymer, 0.5 wt% of the photoinitiator, and 0.005 wt% of the light absorber, based on 100 wt% of the photocatalytic composition. A photocatalyst was prepared by photocuring the photocatalytic composition using a UV-visible 3D printer.

[0079]

[0080] <Comparative Example 1-2> Ceramic composite photocatalyst synthesized by hydrothermal process for 3 hours

[0081] A ceramic composite photocatalyst was manufactured in the same manner as in Example 1, except that hydrothermal synthesis was performed by heating at 180°C for 3 hours.

[0082]

[0083] <Comparative Example 1-3> Ceramic composite photocatalyst synthesized by hydrothermal process for 6 hours

[0084] A ceramic composite photocatalyst was manufactured in the same manner as in Example 1, except that hydrothermal synthesis was performed by heating at 180°C for 6 hours.

[0085]

[0086] <Experimental Example 1> SEM Analysis of Photocatalyst

[0087] <Experimental Example 1-1> SEM analysis of cross-sectional area

[0088] The cross-sectional area of ​​the photocatalyst manufactured in Example 1 was photographed and analyzed using SEM, and the results are shown in Fig. 4.

[0089] As shown in Fig. 4, the ceramic composite photocatalyst of Example 1 was observed to have distinctly separated regions, including a core, a boundary, and a surface. Titanium dioxide nanoparticles with a size of 106 nm to 219 nm were observed in the core region of the photocatalyst, and nanowires with a diameter of 75 to 155 nm were observed in the surface region.

[0090]

[0091] <Experimental Example 1-2> SEM analysis of the surface

[0092] The surface of the photocatalysts manufactured in Example 1 and Comparative Examples 1-1 to 1-3 was photographed and analyzed using SEM, and the results are shown in Fig. 5.

[0093] As shown in Fig. 5, in the ceramic photocatalyst of Comparative Example 1-1, which was not subjected to hydrothermal synthesis, titanium dioxide nanoparticles were found to be dispersed on the surface. In the ceramic composite photocatalyst of Comparative Example 1-2, which was subjected to hydrothermal synthesis for 3 hours, agglomeration of titanium dioxide nanoparticles was observed, and spherical titanium dioxide particles with an average size of about 160 nm were observed on the surface. In the ceramic composite photocatalyst of Comparative Example 1-3, which was subjected to hydrothermal synthesis for 3 hours, titanium dioxide nanowires with an average diameter of about 120 nm were found to have been formed on a portion of the surface.

[0094] In the ceramic composite photocatalyst in which the hydrothermal synthesis of Example 1 was performed for 12 hours, nanowires with a diameter smaller than 200 nm were found to have grown uniformly on the surface of the photocatalyst and covered the surface of the photocatalyst.

[0095]

[0096] Through the results of Experimental Example 1 as described above, it was confirmed that a ceramic composite photocatalyst in which titanium dioxide nanowires are grown on the surface can be successfully manufactured according to the method for manufacturing a ceramic composite photocatalyst in which titanium dioxide nanowires are formed on the surface according to the present invention.

[0097]

[0098] <Experimental Example 2> Surface and component element analysis

[0099] <Experimental Example 2-1> EDS Analysis

[0100] The surface of the photocatalyst manufactured in Example 1 and Comparative Example 1 was analyzed by EDS, and the results are shown in Fig. 6.

[0101] As shown in Fig. 6, the Ti and O components on the surface of the photocatalyst subjected to hydrothermal synthesis for 12 hours in Example 1 were found to have significantly increased compared to the photocatalyst of Comparative Example 1 that was not subjected to hydrothermal synthesis. Specifically, the Ti component was found to have increased by 15.83% (atomic unit 6.68%), and the O component was found to have increased by 9.98% (atomic unit 20.5%).

[0102]

[0103] <Experimental Example 2-2> XRD Analysis

[0104] The surface of the photocatalyst manufactured in Example 1 and Comparative Examples 1-1 to 1-3 was analyzed by XRD, and the results are shown in Fig. 7.

[0105] As shown in Fig. 7, the diffraction peaks identified on the surface of the photocatalysts of Example 1 and Comparative Examples 1-1 to 1-3 were consistent with the XRD pattern of anatase TiO2 observed at angles of 25.3°, 37.8°, 48.0°, 55.1°, 62.7°, 68.8°, 70.3°, 75.1°, and 75.3°.

[0106]

[0107] <Experimental Example 2-3> TEM Analysis

[0108] The surface of the photocatalyst manufactured in Example 1 was analyzed by TEM, and the results are shown in Fig. 8.

[0109] As shown in Fig. 8, the crystal structure of titanium dioxide nanowires on the surface of the photocatalyst of Example 1 was confirmed, and it was confirmed that it was an anatase phase and that the (101) plane length was 3.82 Å.

[0110]

[0111] Through the results of Experimental Example 2 as described above, it was confirmed that a ceramic composite photocatalyst in which titanium dioxide nanowires in the anatase phase are grown on the surface can be successfully manufactured according to the method for manufacturing a ceramic composite photocatalyst in which titanium dioxide nanowires are formed on the surface according to the present invention.

[0112]

[0113] The composite photocatalyst according to the present invention exhibits excellent photocatalytic performance and mechanical stability, and can be used as a catalyst for environmental protection, renewable energy, CO2 capture, hydrogen production, and water decomposition, including smoke reduction.

[0114] It is expected that this will contribute to alleviating environmental pollution problems by enabling the replacement of conventional catalysts with low catalytic conversion efficiency.

Claims

1. Includes a core layer; a boundary layer; and a surface layer; The above core layer includes titanium dioxide nanoparticles, A ceramic composite photocatalyst having titanium dioxide nanowires formed on the surface, wherein the surface layer comprises titanium dioxide nanowires formed by titanium dioxide nanoparticles included in the core layer moving to the surface and then growing.

2. In paragraph 1, The above core layer is, A ceramic composite photocatalyst having titanium dioxide nanowires formed on a surface, characterized by comprising a photocatalytic composition comprising titanium dioxide nanoparticles, ceramic powder, a photocurable polymer, a photoinitiator, and a light absorber.

3. In paragraph 2, The above photocatalytic composition, A ceramic composite photocatalyst having titanium dioxide nanowires formed on a surface, characterized in that it comprises 5 to 20 wt% of the titanium dioxide nanoparticles, 5 to 20 wt% of the ceramic powder, 60 to 90 wt% of the photocurable polymer, 0.2 to 0.8 wt% of the photoinitiator, and 0.002 to 0.008 wt% of the light absorber, relative to 100 wt% of the photocatalytic composition.

4. In paragraph 1, The above titanium dioxide nanowires, It is an anatase (anatase) product, A ceramic composite photocatalyst having titanium dioxide nanowires formed on the surface, characterized in that the diameter is 100 to 250 nm.

5. Step of preparing a photocatalytic composition; A step of photo-curing the photocatalyst composition to produce a photocatalyst; and A method for manufacturing a ceramic composite photocatalyst having titanium dioxide nanowires formed on the surface, comprising a step of hydrothermally synthesizing the above-mentioned cured photocatalyst.

6. In paragraph 5, The step of manufacturing the above photocatalytic composition comprises: A step of preparing a ceramic slurry by mixing ceramic particles with a photocurable polymer; and A method for producing a ceramic composite photocatalyst having titanium dioxide nanowires formed on the surface, characterized by comprising the step of producing a photocatalytic composition by mixing a photoinitiator, a light absorber, and titanium dioxide nanoparticles into the ceramic slurry.

7. In paragraph 5, The step of manufacturing the above photocatalytic composition comprises: A method for producing a ceramic composite photocatalyst having titanium dioxide nanowires formed on a surface, characterized in that a photocatalyst composition is produced comprising 5 to 20 wt% of the titanium dioxide particles, 5 to 20 wt% of the ceramic particles, 60 to 90 wt% of the photocurable polymer, 0.2 to 0.8 wt% of the photoinitiator, and 0.002 to 0.008 wt% of the light absorber, relative to 100 wt% of the photocatalyst composition.

8. In paragraph 5, The step of manufacturing a photocatalyst by photo-curing is as follows: A method for producing a ceramic composite photocatalyst having titanium dioxide nanowires formed on the surface, characterized in that the photocatalytic composition is irradiated with UV light of 350 to 450 nm.

9. In paragraph 5, The above sequence synthesis step is: A step of adding diethylene glycol to distilled water; A step of preparing a mixed solvent by adding potassium titanium oxalate to the solvent to which the above diethylene glycol has been added and stirring; A step of adding the cured photocatalyst to the mixed solvent and then heating to form titanium dioxide nanowires; A step of cooling the photocatalyst in which the titanium dioxide nanowires are formed; and A method for manufacturing a ceramic composite photocatalyst having titanium dioxide nanowires formed on a surface, characterized in that it comprises a step of washing and drying the photocatalyst having the cooled titanium dioxide nanowires formed thereon.

10. In paragraph 9, The step of forming titanium dioxide nanowires by heating is as follows: A method for producing a ceramic composite photocatalyst having titanium dioxide nanowires formed on the surface, characterized by heating at 150 to 200°C for 10 to 14 hours.

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