TiO2 photocatalyst and preparation method thereof

Abstract

The invention provides a TiO2 photocatalyst and a preparation method thereof, and relates to the technical field of photocatalysis, the preparation method of the TiO2 photocatalyst comprises the following steps: uniformly mixing terephthalic acid, 2-aminoterephthalic acid, isopropyl titanate, an acid solution and a first organic solvent to obtain a first solution; carrying out hydrothermal reaction on the first solution, filtering, washing and drying to obtain an organic metal framework material; and calcining the organic metal framework material to obtain the TiO2 photocatalyst. The TiO2 photocatalyst prepared by the method disclosed by the invention is relatively high in electron-hole separation efficiency, relatively high in CO2 photocatalytic efficiency and relatively excellent in CH4 selectivity. Besides, terephthalic acid is prepared from waste PET plastic as a raw material and is applied to preparation of the organic metal frame material, so that the influence of PET plastic waste on the environment can be effectively reduced, and the production cost of the TiO2 photocatalyst can be reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of photocatalysis, and more specifically, to a TiO2 photocatalyst and a preparation method thereof. Background Art

[0002] The CO2 photocatalytic reduction technology is an environmentally friendly technology that mimics plant photosynthesis and uses sunlight to convert CO2 into useful chemicals, with important potential for clean energy utilization and atmospheric environment governance. However, the CO2 photocatalytic reduction reaction still faces technical bottlenecks such as low yield, poor selectivity, and low reaction efficiency. Developing highly efficient photocatalysts has become the key to its application. Traditional TiO2 photocatalysts have a wide bandgap (about 3.2 eV), which makes them mainly respond to ultraviolet light and have low reaction efficiency under visible light. In addition, during the photocatalytic process of TiO2, there is a phenomenon of electron-hole pair recombination, resulting in low photocatalytic efficiency. Even by some methods to improve its conductivity and surface properties, the poor product selectivity and low reaction efficiency of TiO2 still limit its wide application in CO2 photocatalytic reduction.

[0003] As an organic metal framework material, Ti-MOF has a unique pore structure that can provide more reaction sites and a higher surface area, effectively enhancing the contact area of the photocatalytic reaction. By optimizing the pore structure of Ti-MOF and further pyrolyzing, TiO2 with a hierarchical pore structure can be synthesized. However, the TiO2 photocatalyst obtained using conventional Ti-MOF still has problems such as low electron-hole separation efficiency, low CO2 photocatalytic efficiency, and poor CH4 selectivity. Summary of the Invention

[0004] The problem solved by the present invention is that the TiO2 photocatalyst obtained using conventional Ti-MOF still has problems such as low electron-hole separation efficiency, low CO2 photocatalytic efficiency, and poor CH4 selectivity.

[0005] To solve the above problems, the present invention provides a preparation method of a TiO2 photocatalyst, including:

[0006] Step S1: Mix terephthalic acid, 2-aminoterephthalic acid, titanium isopropoxide, an acid solution, and a first organic solvent evenly to obtain a first solution;

[0007] Step S2: After subjecting the first solution to a hydrothermal reaction, filter, wash, and dry it to obtain an organic metal framework material;

[0008] Step S3: Calcinate the organic metal framework material to obtain a TiO2 photocatalyst.

[0009] Optionally, in the step S1, the molar ratio of the terephthalic acid, the 2-aminoterephthalic acid, and the isopropyl titanate is (1 to 17):(1 to 8):(1 to 22).

[0010] Optionally, in the step S1, the acid solution includes at least one of hydrochloric acid, sulfuric acid, and acetic acid.

[0011] Optionally, in the step S1, the first organic solvent includes at least one of N,N-dimethylformamide and methanol.

[0012] Optionally, in the step S2, the temperature of the hydrothermal reaction is 100°C to 200°C, and the time is 12 h to 36 h.

[0013] Optionally, in the step S3, the temperature of the calcination treatment is 300°C to 400°C, and the time is 2 h to 3 h.

[0014] Optionally, in the step S1, the preparation method of the terephthalic acid includes:

[0015] Step S11: Mix ethanol, a base, and a second organic solvent evenly to obtain a second solution;

[0016] Step S12: Add waste PET plastic to the second solution, stir and react under ultrasonic conditions, and collect the precipitate to obtain a metal terephthalate compound;

[0017] Step S13: Dissolve the metal terephthalate compound in water, add a pH regulator to adjust the pH of the solution to 2 to 4, filter, wash, and dry to obtain terephthalic acid.

[0018] Optionally, in the step S11, the base includes at least one of sodium hydroxide, potassium hydroxide, and lithium hydroxide.

[0019] Optionally, in the step S11, the second organic solvent includes at least one of dichloromethane, dimethyl sulfoxide, chloroform, tetrahydrofuran, acetone, and dioxane.

[0020] The present invention also provides a TiO2 photocatalyst prepared by using the above-mentioned preparation method of the TiO2 photocatalyst.

[0021] Compared with the related technologies, in the acidic preparation conditions of the present invention, terephthalic acid and 2-aminoterephthalic acid are used together as organic ligands to carry out a polymerization reaction with isopropyl titanate. This process is a gel formation process. Compared with a single organic ligand (such as terephthalic acid), the organic ligand is composed of terephthalic acid and 2-aminoterephthalic acid together, which enhances the basicity of the organic ligand and has a stronger coordination bond, making it more stable under acidic conditions. This gelation process enables the metal-organic framework material to maintain the regularity and crystal structure of the MOF, while introducing more defects in the surface area of the material, thereby promoting the photocatalytic reduction of CO2. In addition, by regulating the ratio of terephthalic acid and 2-aminoterephthalic acid, key parameters such as the structure, stability, catalytic performance, gas adsorption capacity, and electronic properties of the metal-organic framework material can be precisely controlled, enabling the TiO2 photocatalyst prepared by further calcination to have a higher electron transfer efficiency, a stronger light absorption capacity, and a more abundant pore structure, thereby improving the product selectivity and catalytic efficiency. In addition, the amino group introduced by 2-aminoterephthalic acid will cause N nitrogen doping in the TiO2 photocatalyst during the preparation process, resulting in the TiO2 photocatalyst having a higher CH4 selectivity. In summary, the TiO2 photocatalyst prepared by the method of the present invention has a higher electron-hole separation efficiency, a higher CO2 photocatalytic efficiency, and a better CH4 selectivity. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic flow chart of the preparation method of the TiO2 photocatalyst in the embodiment of the present invention;

[0023] Figure 2 It is a comparison chart of XRD patterns of commercial terephthalic acid and the terephthalic acid prepared in Example 1;

[0024] Figure 3 It is a comparison chart of the morphologies of commercial terephthalic acid and the terephthalic acid prepared in Example 1;

[0025] Figure 4 It is a comparison chart of FT-IR spectra and XRD patterns of the metal-organic framework materials and TiO2 photocatalysts prepared in Example 2, Comparative Example 1, and Comparative Example 2;

[0026] Figure 5 It is a comparison chart of the morphologies of the metal-organic framework materials prepared in Example 2, and the TiO2 photocatalysts prepared in Example 2, Comparative Example 1, and Comparative Example 2;

[0027] Figure 6 It is a comparison chart of photocurrent intensity and charge transfer resistance of the metal-organic framework material prepared in Example 2, and the TiO2 photocatalysts prepared in Example 2, Comparative Example 1, and Comparative Example 2. DETAILED DESCRIPTION OF THE INVENTION

[0028] To make the above objects, features, and advantages of the present invention more apparent and understandable, the following provides a detailed description of specific embodiments of the present invention in conjunction with the accompanying drawings. Although certain embodiments of the present invention are shown in the drawings, it should be understood that the present invention can be implemented in various forms and should not be construed as limited to the embodiments described herein. Instead, these embodiments are provided to more thoroughly and completely understand the present invention. It should be understood that the drawings and embodiments of the present invention are only for exemplary purposes and are not used to limit the protection scope of the present invention.

[0029] Unless otherwise defined, all technical and scientific terms used in the present invention have the same meaning as commonly understood by those skilled in the technical field to which the present invention belongs. The terms used in the present invention in the specification are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0030] The term "including" and its variants used herein are open-ended, that is, "including but not limited to"; the term "based on" is "at least partially based on"; the term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one additional embodiment"; the term "some embodiments" means "at least some embodiments"; the term "optionally" means "optional embodiments". The relevant definitions of other terms will be given in the following description. It should be noted that the concepts of "first", "second", etc. mentioned in the present invention are used to distinguish different objects and are not used to describe a specific order or primary-secondary relationship. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise stated, the meaning of "a plurality" is two or more.

[0031] As Figure 1 shown, this embodiment provides a method for preparing a TiO2 photocatalyst according to the present invention, including:

[0032] Step S1: Mix terephthalic acid, 2-aminoterephthalic acid, titanium isopropoxide, acid solution, and a first organic solvent evenly to obtain a first solution;

[0033] Step S2: After subjecting the first solution to a hydrothermal reaction, filter, wash, and dry it to obtain an organic metal framework material;

[0034] Step S3: Calcinate the organic metal framework material to obtain a TiO2 photocatalyst.

[0035] In the embodiments of the present invention, under acidic preparation conditions, terephthalic acid and 2-aminoterephthalic acid are used together as organic ligands to carry out a polymerization reaction with titanium isopropoxide. This process is a gel formation process. Compared with a single organic ligand (such as terephthalic acid), the organic ligand is composed of terephthalic acid and 2-aminoterephthalic acid together, enhancing the basicity of the organic ligand, having stronger coordination bonds, making it more stable under acidic conditions. This gelation process enables the metal-organic framework material to maintain the regularity and crystal structure of the MOF, while introducing more defects in the surface area of the material, thereby promoting the photocatalytic reduction of CO2. In addition, by adjusting the ratio of terephthalic acid and 2-aminoterephthalic acid, key parameters such as the structure, stability, catalytic performance, gas adsorption capacity, and electronic properties of the metal-organic framework material can be precisely controlled, enabling the TiO2 photocatalyst prepared by further calcination to have higher electron transfer efficiency, stronger light absorption capacity, and richer pore structure, improving the product selectivity and catalytic efficiency. In addition, the amino group introduced by 2-aminoterephthalic acid will cause N nitrogen doping in the TiO2 photocatalyst during the preparation process, resulting in the TiO2 photocatalyst having higher CH4 selectivity. In summary, the TiO2 photocatalyst prepared by the method of the embodiments of the present invention has a higher electron-hole separation efficiency, a higher CO2 photocatalytic efficiency, and a better CH4 selectivity.

[0036] In some embodiments of the present invention, in step S1, the molar ratio of the terephthalic acid, the 2-aminoterephthalic acid, and the titanium isopropoxide is (1 to 17):(1 to 8):(1 to 22).

[0037] In some embodiments of the present invention, in step S1, the acid solution includes at least one of hydrochloric acid, sulfuric acid, and acetic acid.

[0038] In some embodiments of the present invention, in step S1, the first organic solvent includes at least one of N,N-dimethylformamide (DMF) and methanol.

[0039] In some embodiments of the present invention, in step S2, the temperature of the hydrothermal reaction is 100°C to 200°C, and the time is 12 h to 36 h.

[0040] In some embodiments of the present invention, in step S3, the temperature of the calcination treatment is 300°C to 400°C, and the time is 2 h to 3 h.

[0041] In some embodiments of the present invention, in step S1, the preparation method of the terephthalic acid includes:

[0042] Step S11: Mix ethanol, a base, and a second organic solvent evenly to obtain a second solution;

[0043] Step S12: Add waste PET plastic into the second solution, stir and react under ultrasonic conditions, and collect the precipitate to obtain a metal terephthalate compound.

[0044] Step S13: Dissolve the metal terephthalate compound in water, add a pH regulator to adjust the pH of the solution to 2 to 4, and perform filtration, washing and drying to obtain terephthalic acid.

[0045] It should be noted that the waste PET plastic used in the present invention has been washed, and the specific washing method belongs to the prior art and will not be elaborated here.

[0046] In this embodiment, terephthalic acid is prepared from waste polyethylene terephthalate (PET) plastic, and the prepared terephthalic acid is applied to the preparation of an organic metal framework material, and finally a TiO2 photocatalyst is obtained, which can not only effectively reduce the environmental impact of PET plastic waste, but also reduce the production cost of the TiO2 photocatalyst and promote the sustainable utilization of resources.

[0047] In some embodiments of the present invention, in step S11, the base includes at least one of sodium hydroxide, potassium hydroxide and lithium hydroxide.

[0048] In some embodiments of the present invention, in step S11, the second organic solvent includes at least one of dichloromethane, dimethyl sulfoxide (DMSO), chloroform, tetrahydrofuran, acetone and dioxane.

[0049] The embodiment of the present invention also provides a TiO2 photocatalyst, which is prepared by the above-mentioned preparation method of the TiO2 photocatalyst.

[0050] The present invention will be further described below in conjunction with specific embodiments.

[0051] Example 1: Preparation of terephthalic acid from waste PET plastic

[0052] A1: Mix 12 mL of ethanol, 1.5 g of potassium hydroxide and 18 mL of the second organic solvent evenly to obtain a second solution; wherein, the second organic solvent is composed of dichloromethane and dimethyl sulfoxide in a volume ratio of 1:1.

[0053] A2: Add 1 g of waste PET plastic into the second solution, stir and react under ultrasonic conditions, and collect the precipitate to obtain potassium terephthalate; wherein, the stirring reaction speed is 100 rpm and the time is 15 min.

[0054] A3: Dissolve the potassium terephthalate in water, add a pH regulator to adjust the pH of the solution to 3, and perform filtration, washing and drying to obtain terephthalic acid; wherein, the pH regulator is hydrochloric acid.

[0055] Example 2

[0056] B1. Mix terephthalic acid, 2-aminoterephthalic acid, isopropyl titanate, 1.62 mL of acetic acid and 60 mL of a first organic solvent uniformly to obtain a first solution; wherein, the first organic solvent consists of 54 mL of N,N-dimethylformamide and 6 mL of methanol; in the first solution, the concentration of terephthalic acid is 0.12 mol / L, the concentration of 2-aminoterephthalic acid is 0.05 mol / L, and the concentration of isopropyl titanate is 0.17 mol / L; the terephthalic acid is prepared by the method in Example 1.

[0057] B2. After subjecting the first solution to a hydrothermal reaction, filter, wash and dry it to obtain an organic metal framework material, named GF2; wherein, the temperature of the hydrothermal reaction is 150 °C and the time is 24 h.

[0058] B3. Calcinate the organic metal framework material to obtain a TiO2 photocatalyst, named GF2-TiO2; wherein, the temperature of the calcination treatment is 400 °C and the time is 2 h.

[0059] Example 3

[0060] The difference from Example 2 is that in step B2, the temperature of the hydrothermal reaction is 200 °C and the time is 12 h; in step B3, the temperature of the calcination treatment is 300 °C and the time is 3 h.

[0061] Example 4

[0062] The difference from Example 2 is that in step B2, the temperature of the hydrothermal reaction is 100 °C and the time is 36 h.

[0063] Comparative Example 1

[0064] B1. Mix terephthalic acid, isopropyl titanate, 1.62 mL of acetic acid and 60 mL of a first organic solvent uniformly to obtain a first solution; wherein, the first organic solvent consists of 54 mL of N,N-dimethylformamide and 6 mL of methanol; in the first solution, the concentration of terephthalic acid is 0.17 mol / L and the concentration of isopropyl titanate is 0.17 mol / L; the terephthalic acid is prepared by the method in Example 1.

[0065] B2. After subjecting the first solution to a hydrothermal reaction, filter, wash and dry it to obtain an organic metal framework material, named MOG; wherein, the temperature of the hydrothermal reaction is 150 °C and the time is 24 h.

[0066] B3. Calcinate the metal-organic framework material to obtain a TiO2 photocatalyst named MOG-TiO2. Among them, the temperature of the calcination treatment is 400 °C and the time is 2 h.

[0067] Comparative Example 2

[0068] B1. Mix 2-aminoterephthalic acid, titanium isopropoxide, 1.62 mL of acetic acid and 60 mL of a first organic solvent evenly to obtain a first solution. Among them, the first organic solvent consists of 54 mL of N,N-dimethylformamide and 6 mL of methanol. In the first solution, the concentration of 2-aminoterephthalic acid is 0.17 mol / L and the concentration of titanium isopropoxide is 0.17 mol / L. The terephthalic acid is prepared by the method in Example 1.

[0069] B2. After carrying out a hydrothermal reaction on the first solution, carry out filtration, washing and drying to obtain a metal-organic framework material named MOF. Among them, the temperature of the hydrothermal reaction is 150 °C and the time is 24 h.

[0070] B3. Calcinate the metal-organic framework material to obtain a TiO2 photocatalyst named MOF-TiO2. Among them, the temperature of the calcination treatment is 400 °C and the time is 2 h.

[0071] Experimental Example

[0072] The XRD and scanning electron microscope characterization results of commercial terephthalic acid and the terephthalic acid prepared in Example 1 are shown in Figures 2 to 3 , from Figures 2 to 3 it can be seen that the terephthalic acid prepared from waste PET plastic in Example 1 has the same XRD pattern characteristics and the same morphological characteristics as commercial terephthalic acid, indicating the successful recycling of waste PET plastic. It should be noted that Figure 2 the terephthalic acid series corresponds to the terephthalic acid prepared in Example 1. Figure 3 In Figure 3 a is the scanning electron microscope picture of commercial terephthalic acid,

[0073] Carry out FT-IR spectrum and XRD spectrum characterization on the metal-organic framework materials and TiO2 photocatalysts prepared in Example 2, Comparative Example 1 and Comparative Example 2, and the results are shown in Figure 4 , from Figure 4 it can be seen that the main crystal phase in the TiO2 photocatalysts prepared in Example 2, Comparative Example 1 and Comparative Example 2 is anatase TiO2. It should be noted that Figure 4 inFigure 4 Figure b is a comparative diagram of the FT-IR spectra of the TiO2 photocatalysts prepared in Example 2, Comparative Example 1, and Comparative Example 2; Figure 4 Figure c is a comparative diagram of the XRD spectra of the metal-organic framework materials prepared in Example 2, Comparative Example 1, and Comparative Example 2; Figure 4 Figure b is a comparative diagram of the XRD spectra of the TiO2 photocatalysts prepared in Example 2, Comparative Example 1, and Comparative Example 2.

[0074] The morphologies of the metal-organic framework materials prepared in Example 2, Comparative Example 1, and Comparative Example 2, and the TiO2 photocatalyst prepared in Example 2 were characterized, and the results are shown in Figure 5 From Figure 5 it can be seen that the diameter of the metal-organic framework material (MOF) prepared in Comparative Example 2 is about 500 nm, and the metal-organic framework material (MOG) prepared in Comparative Example 1 exhibits a sponge-like porous structure composed of interconnected small spherical particles. The metal-organic framework material (GF2) prepared in Example 2 has a similar size and shape to MOF, but its surface is porous and rough, containing a large number of highly aggregated particles, presenting a complex intertwined and irregular network structure in the HR-TEM image. The HR-TEM image of the TiO2 photocatalyst (GF2-TiO2) prepared by calcining GF2 shows that the surface crystal planes are mainly the (101) and (004) crystal planes of anatase TiO2, and an edge heterojunction is formed between the crystal planes, which is beneficial to improving the interfacial electronic structure, promoting the separation of charge carriers, and enhancing the photocatalytic performance of the TiO2 photocatalyst. It should be noted that Figure 5 Figure a is a scanning electron microscope image of the metal-organic framework material (MOF) prepared in Comparative Example 2, Figure 5 Figure b is a scanning electron microscope image of the metal-organic framework material (MOG) prepared in Comparative Example 1, Figure 5 Figure c is a scanning electron microscope image of the metal-organic framework material (GF2) prepared in Example 2, Figure 5 Figure d is a HR-TEM image of the TiO2 photocatalyst (GF2-TiO2) prepared in Example 2.

[0075] The photocurrent intensity and charge transfer resistance of the metal-organic framework material prepared in Example 2, and the TiO2 photocatalysts prepared in Example 2, Comparative Example 1, and Comparative Example 2 were characterized, and the results are shown in Figure 6 From Figure 6As can be seen from a, due to the low separation rate of electron-hole pairs, the organometallic framework material (GF2) prepared in Example 2, the TiO2 photocatalyst (MOF-TiO2) prepared in Comparative Example 2, and the TiO2 photocatalyst (MOG-TiO2) prepared in Comparative Example 1 all exhibited relatively weak transient photocurrent (TPC) signals. In contrast, the TPC intensity of the TiO2 photocatalyst (GF2-TiO2) prepared in Example 2 was significantly increased. From Figure 6 As can be seen from b, in contrast, the arc semicircle of the TiO2 photocatalyst (GF2-TiO2) prepared in Example 2 was the smallest, indicating the lowest interfacial resistance of charge transfer. These characteristics indicate that the TiO2 photocatalyst (GF2-TiO2) prepared in Example 2 has better photogenerated carrier generation and separation efficiency, which makes GF2-TiO2 have excellent CO2 photoreduction efficiency. It should be noted that Figure 6 Figure a is a comparison chart of the photocurrent intensities of the organometallic framework material prepared in Example 2 and the TiO2 photocatalysts prepared in Example 2, Comparative Example 1, and Comparative Example 2. Figure 6 Figure b is a comparison chart of the charge transfer resistances of the organometallic framework material prepared in Example 2 and the TiO2 photocatalysts prepared in Example 2, Comparative Example 1, and Comparative Example 2.

[0076] The TiO2 photocatalysts prepared in Example 2, Comparative Example 1, and Comparative Example 2 were used for CO2 photocatalytic reduction respectively, and the yields and product selectivities of CO and CH4 were counted. The results are shown in Table 1. As can be seen from Table 1, compared with the TiO2 photocatalysts prepared in Comparative Example 1 and Comparative Example 2, the TiO2 photocatalyst (GF2-TiO2) prepared in Example 2 had better CH4 selectivity and higher CH4 yield.

[0077] Table 1

[0078]

[0079] Although the present invention is disclosed as above, the protection scope of the present invention is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, and these changes and modifications will all fall within the protection scope of the present invention.

Claims

1. A preparation method of a TiO2 photocatalyst, characterized in that, Including: Step S1: Mix terephthalic acid, 2-aminoterephthalic acid, isopropyl titanate, acid solution and a first organic solvent evenly to obtain a first solution; Step S2: After subjecting the first solution to a hydrothermal reaction, filter, wash and dry it to obtain an organic metal framework material; Step S3: Calcinate the organic metal framework material to obtain a TiO2 photocatalyst.

2. The preparation method of the TiO2 photocatalyst according to claim 1, wherein, In the step S1, the molar ratio of the terephthalic acid, the 2-aminoterephthalic acid, and the isopropyl titanate is (1 to 17):(1 to 8):(1 to 22).

3. The preparation method of the TiO2 photocatalyst according to claim 1, wherein, In the step S1, the acid solution includes at least one of hydrochloric acid, sulfuric acid and acetic acid.

4. The preparation method of the TiO2 photocatalyst according to claim 1, wherein In the step S1, the first organic solvent includes at least one of N,N-dimethylformamide and methanol.

5. The preparation method of the TiO2 photocatalyst according to claim 1, characterized in that, In the step S2, the temperature of the hydrothermal reaction is 100°C to 200°C, and the time is 12 h to 36 h.

6. The preparation method of the TiO2 photocatalyst according to claim 1, characterized in that, In the step S3, the temperature of the calcination treatment is 300°C to 400°C, and the time is 2 h to 3 h.

7. The preparation method of the TiO2 photocatalyst according to claim 1, wherein, In the step S1, the preparation method of the terephthalic acid includes: Step S11: Mix ethanol, alkali and a second organic solvent evenly to obtain a second solution; Step S12: Add waste PET plastic to the second solution, stir and react under ultrasonic conditions, and collect the precipitate to obtain a terephthalic acid metal compound; Step S13: Dissolve the terephthalic acid metal compound in water, add a pH regulator to adjust the pH of the solution to 2 to 4, filter, wash and dry to obtain terephthalic acid.

8. The preparation method of the TiO2 photocatalyst according to claim 7, characterized in that, In the step S11, the alkali includes at least one of sodium hydroxide, potassium hydroxide and lithium hydroxide.

9. The preparation method of the TiO2 photocatalyst according to claim 7, characterized in that, In the step S11, the second organic solvent includes at least one of dichloromethane, dimethyl sulfoxide, chloroform, tetrahydrofuran, acetone and dioxane.

10. A TiO2 photocatalyst, characterized in that, Prepared by using the preparation method of the TiO2 photocatalyst according to any one of claims 1-9.

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