A titanium dioxide-based photocatalyst, a preparation method thereof, and a device for continuously synthesizing hydrogen peroxide by three-phase interface photocatalysis

Abstract

The present invention provides a titanium dioxide-based photocatalyst, characterized in that the titanium dioxide-based photocatalyst comprises titanium nanotubes, a surface modifier and a metal; the titanium nanotubes serve as a carrier, and the surface modifier and the metal are loaded on the titanium nanotubes. The titanium dioxide-based photocatalyst of the present invention is used for the photocatalytic synthesis of H2O2 at a three-phase interface, greatly improving the efficiency and yield of the photocatalytic synthesis of H2O2. The continuous three-phase interface photocatalytic synthesis device for hydrogen peroxide of the present invention realizes continuous production of H2O2, solves the safety and economic problems of the transportation and storage of H2O2, realizes the instant production and use of H2O2 in daily life and production activities, and greatly expands the use of this excellent disinfectant, H2O2, in households and public spaces.

Description

Technical Field

[0001] The present invention relates to the field of photocatalytic air purification equipment, and particularly to a titanium dioxide-based photocatalyst, a preparation method thereof, and a device for continuously synthesizing hydrogen peroxide at a three-phase interface by photocatalysis. Background Art

[0002] Hydrogen peroxide (H2O2) is a weak oxidant with a simple structure. Due to the existence of an unstable peroxy bond, it is easily broken and reduced to oxygen or hydroxyl radicals when participating in reactions, thus showing certain oxidizing properties. It is widely used in various fields, such as bleaching, disinfection, sterilization, environmental remediation, etc. Since the H2O2 molecule contains only two elements, H and O, during the process of participating in various reactions, the products generally exist in the form of water and oxygen, thereby largely avoiding the environmental pollution problems caused during the use of various oxidants. Therefore, it is regarded as a relatively environmentally friendly air purification reagent. In recent years, H2O2 has gradually been applied in the field of indoor air purification to oxidize and decompose volatile organic compounds, pathogenic bacteria, odor substances, etc. in the air.

[0003] Currently, the industrial production of H2O2 mainly relies on the anthraquinone method. However, the anthraquinone method also has undeniable disadvantages: on the one hand, its production process has high energy consumption; on the other hand, various organic pollutants will be generated during its reaction process, putting pressure on the environment. Therefore, in order to overcome these problems, in recent years, researchers have widely studied the method of directly synthesizing H2O2 from pollution-free hydrogen and oxygen. However, like the anthraquinone method, the direct synthesis method of hydrogen and oxygen requires the use of precious metals or rare metal catalysts, and the synthesis cost is high; in addition, during the synthesis process of the direct synthesis method of hydrogen and oxygen, hydrogen and oxygen are directly mixed, posing a very large potential safety hazard.

[0004] In order to solve the problems of high energy consumption and environmental pollution in the current synthesis process of H2O2, researchers have actively explored more economical and environmentally friendly synthesis routes. One relatively ideal method is to use light driving, combined with a catalyst, to synthesize H2O2 from water and oxygen as raw materials. This green, environmentally friendly and low-cost in-situ synthesis technology of H2O2 usually requires an organic sacrificial agent (such as alcohols) to improve its yield, which poses challenges to actual production: the generated H2O2 is mixed with water and the alcohol sacrificial agent, making its subsequent separation and purification difficult. Therefore, on this basis, developing a green preparation technology that can not only efficiently produce H2O2 but also be easily separated and applying it to the field of indoor air purification has great practical significance and application value.

[0005] In summary, there is an urgent need to develop a new technical solution to solve the problems existing in the prior art. Summary of the Invention

[0006] Based on this, the present invention provides a titanium dioxide-based photocatalyst, a preparation method thereof, and a device for continuously synthesizing hydrogen peroxide at a three-phase interface. Under ultraviolet light irradiation, the titanium dioxide-based photocatalyst can photocatalytically synthesize H2O2. The device for continuously synthesizing hydrogen peroxide at a three-phase interface of the present invention is a novel flow-type photocatalytic reaction device for on-site preparation, small and highly efficient, and generating H2O2 through an electrocatalytic oxygen reduction reaction. It can synthesize H2O2 on-site and directly use it for indoor sterilization and air purification through an efficient atomization device, solving the problems that H2O2 is difficult to separate and not convenient for on-site application in the technology of photocatalytic production of H2O2.

[0007] An object of the present invention is to provide a titanium dioxide-based photocatalyst, which includes titanium nanotubes, a surface modifier, and a metal;

[0008] The titanium nanotubes serve as a carrier, and the surface modifier and the metal are loaded on the titanium nanotubes.

[0009] Further, the surface modifier is selected from one or more of octadecylphosphonic acid, triethoxyoctylsilane, or fluorosilane.

[0010] Further, the metal is selected from one or more of Au, Pt, or Ni.

[0011] Further, the diameter of the titanium nanotubes is 3 - 8 nm.

[0012] Further, the loading amount of the surface modifier on the titanium nanotubes is 0.01 - 0.2 wt%; the loading amount of the metal on the titanium nanotubes is 0.1 - 2 wt%.

[0013] Another object of the present invention is to provide a preparation method of the titanium dioxide-based photocatalyst, including the following steps:

[0014] S1. Perform a hydrothermal reaction on TiO2 to obtain NaTNT;

[0015] S2. Blend and react the NaTNT with an acid to obtain HTNT;

[0016] S3. Calcinate the HTNT to obtain TNT;

[0017] S4. Blend and react the TNT with a metal salt to obtain metal-TNT;

[0018] S5. Blend and react the metal-TNT with a surface modifier to obtain the titanium dioxide-based photocatalyst.

[0019] Further, in step S1, the temperature of the hydrothermal reaction is 130 - 170 °C, and the time is 15 - 25 h.

[0020] Further, in step S3, the calcination temperature is 300-500°C and the time is 1-3h.

[0021] Further, in step S4, the mass ratio of TNT to metal salt is 150-250:1.

[0022] Further, in step S5, the mass ratio of TNT to surface modifier is 1800-2200:1.

[0023] Another object of the present invention is to provide a continuous three-phase interface photocatalytic synthesis device for hydrogen peroxide, and the continuous three-phase interface photocatalytic synthesis device for hydrogen peroxide uses the titanium dioxide-based photocatalyst as a catalyst.

[0024] The continuous three-phase interface photocatalytic synthesis device for hydrogen peroxide of the present invention is provided with a three-phase interface photocatalytic reactor, a water storage tank, a hydrogen peroxide storage tank, a high-efficiency atomizer and an external power source.

[0025] The three-phase interface photocatalytic reactor includes a photocatalytic reaction cavity and an ultraviolet lamp. During the photocatalytic synthesis of H2O2, benzyl alcohol, water and a photocatalyst are added to the photocatalytic reaction cavity, wherein the addition amount of benzyl alcohol is 1 / 5-1 / 2 of the internal volume of the photocatalytic reaction cavity, and the addition amount of water is 1 / 2-4 / 5 of the internal volume of the photocatalytic reaction cavity; a liquid inlet and a liquid outlet are respectively provided at the top of the photocatalytic reaction cavity; filters are respectively provided at the liquid inlet and the liquid outlet; the filter is a porous ceramic filter or a polymeric fiber filter.

[0026] Peristaltic pumps are respectively provided between the water storage tank and the three-phase interface photocatalytic reactor, between the three-phase interface photocatalytic reactor and the hydrogen peroxide storage tank, and between the hydrogen peroxide storage tank and the high-efficiency atomizer, which is convenient for transporting the produced H2O2 solution to the high-efficiency atomizer.

[0027] In addition, in specific production implementation, the peristaltic pump can also be used to transport the H2O2 solution flowing out from the liquid outlet back to the liquid inlet again, so that the H2O2 solution reacts cyclically to increase the concentration of the H2O2 solution.

[0028] The external power source can be selected from power sources such as lithium batteries, lead-acid batteries, nickel-metal hydride batteries, dry batteries, etc., or commercial power can also be used.

[0029] The present invention has the following beneficial effects:

[0030] The titanium dioxide-based photocatalyst of the present invention is prepared from titanium nanotubes, a surface modifier, and a metal. Using the titanium nanotubes as a carrier, the surface modifier and the metal are loaded on the titanium nanotubes. When applied to the synthesis process of H2O2, it can be stably utilized for a long time and can be applied to the photocatalytic synthesis of H2O2 at the three-phase interface, greatly improving the efficiency and yield of photocatalytic synthesis of H2O2, and is suitable for wide promotion and use.

[0031] The titanium dioxide-based photocatalyst of the present invention has low cost, simple synthesis process, is suitable for mass production, has a large specific surface area, good air circulation performance, rich catalytic active sites, is not easily deactivated, has good ultraviolet photocatalytic activity, and has flexible practical application methods.

[0032] The device for continuously synthesizing hydrogen peroxide at the three-phase interface by photocatalysis of the present invention innovatively uses a three-phase interface photocatalytic reactor. Benzyl alcohol and water are respectively added to the reactor. After standing for a few minutes, the alcohol and water can be well separated. Then, a photocatalyst is added. Under the irradiation of an ultraviolet lamp, an oxygen reduction reaction of one-electron two-step occurs in the reactor system, reducing the air introduced into the water to H2O2. Then, the H2O2 synthesized in the reactor is transported to a hydrogen peroxide storage tank for use by a peristaltic pump arranged inside. At the same time, the water in the water storage tank is continuously pumped into the photocatalytic reactor, realizing continuous production of H2O2, solving the safety and economic problems of H2O2 transportation and storage, realizing the instant production and use of H2O2 in daily life and production activities, and greatly expanding the use of this excellent disinfectant H2O2 in family and public spaces. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 Shows a schematic diagram of the device for continuously synthesizing hydrogen peroxide at the three-phase interface by photocatalysis prepared in the application example;

[0034] Figure 2 Shows a schematic diagram of the three-phase interface photocatalytic reactor in the application example;

[0035] Figure 3 Shows the graph of the yield of H2O2 photocatalytically synthesized under ultraviolet light of OPA / Ni-TNT prepared in Example 1. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0036] In order to more clearly illustrate the technical solutions of the present invention, the following examples are listed. The raw materials, reactions, and post-treatment means that appear in the examples are all common raw materials on the market and technical means well-known to those skilled in the art, unless otherwise specified.

[0037] The experimental methods used in the following examples are all conventional methods unless otherwise specified; the reagents, materials, etc. used in the following examples can all be obtained from commercial channels unless otherwise specified.

[0038] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0039] It should be understood that the orientation or positional relationship indicated by terms such as "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention.

[0040] The TiO2 used in the embodiments of the present invention is commercial P25.

[0041] Example 1

[0042] A titanium dioxide-based photocatalyst, comprising titanium nanotubes, octadecylphosphoric acid and Ni;

[0043] The titanium nanotubes are used as carriers, and the octadecylphosphoric acid and the Ni are loaded on the titanium nanotubes;

[0044] The diameter of the titanium nanotubes is 3.0 - 5.0 nm; the loading amount of octadecylphosphoric acid on the titanium nanotubes is 0.05 wt%, and the loading amount of Ni on the titanium nanotubes is 0.5 wt%;

[0045] The preparation method of the titanium dioxide-based photocatalyst comprises the following steps:

[0046] S1. Mix 3 g of commercial P25 and 70 mL of 10 mol / L sodium hydroxide aqueous solution at room temperature and stir for 30 min, then transfer the mixed solution to a 100 mL stainless steel autoclave with a polytetrafluoroethylene liner, and heat and react at 150 °C for 20 h; after the reaction mixture is cooled to room temperature, centrifuge to collect the white product, wash it with deionized water until the supernatant is neutral, and dry it at 60 °C for 12 h to obtain NaTNT (na-type TNT);

[0047] S2. Blend the NaTNT with 100 mL of 0.1 mol / L nitric acid solution, stir for 6 h, filter, wash with deionized water, and vacuum dry at 60 °C for 12 h to obtain HTNT;

[0048] S3. Calcinate the HTNT at 400 °C for 2 h to obtain TNT;

[0049] S4. Add 0.5 g of the said TNT and 0.02478 g of nickel nitrate hexahydrate into 50 mL of deionized water, stir vigorously for 30 min, add 50 mL of a solution with a NaBH4 concentration of 0.53 mol / L and a NaOH concentration of 0.5 mol / L, continue to stir vigorously for 30 min to fully reduce it, then wash the solid sample with deionized water until the supernatant is neutral, and finally dry it at 60 °C for 12 h to obtain Ni-TNT;

[0050] S5. Place 0.5 g of the said Ni-TNT and 0.25 mg of octadecylphosphonic acid (OPA) in 50 mL of absolute ethanol, soak for 12 h, stir for 10 min every hour in the first 6 h, and continuously stir in the last 6 h. Centrifuge the reaction mixture solution, collect the solid sample, wash it with ethanol to remove free OPA, and then dry it under vacuum at 60 °C to obtain a titanium dioxide-based photocatalyst (OPA / Ni-TNT).

[0051] Example 2

[0052] A titanium dioxide-based photocatalyst, comprising titanium nanotubes, octadecylphosphonic acid and Au;

[0053] The said titanium nanotubes are used as carriers, and the said octadecylphosphonic acid and the said Au are loaded on the said titanium nanotubes;

[0054] The diameter of the said titanium nanotubes is 3.0 - 5.0 nm; the loading amount of octadecylphosphonic acid on the titanium nanotubes is 0.05 wt%, and the loading amount of Au on the titanium nanotubes is 0.5 wt%;

[0055] The preparation method of the said titanium dioxide-based photocatalyst comprises the following steps:

[0056] S1. Mix 3 g of commercial P25 and 70 mL of 10 mol / L sodium hydroxide aqueous solution at room temperature and stir for 30 min, then transfer the mixed solution to a 100 mL stainless steel autoclave with a PTFE liner, heat and react at 160 °C for 18 h; after the reaction mixture solution is cooled to room temperature, centrifuge to collect the white product, wash it with deionized water until the supernatant is neutral, and dry it at 60 °C for 12 h to obtain NaTNT (na-type TNT);

[0057] S2. Blend the said NaTNT with 100 mL of 0.1 mol / L nitric acid solution, stir for 6 h, filter, wash with deionized water, and dry under vacuum at 60 °C for 12 h to obtain HTNT;

[0058] S3. Calcinate the said HTNT at 500 °C for 1.5 h to obtain TNT;

[0059] S4. Add 0.5 g of the said TNT and 0.025 g of gold trichloride into 50 mL of deionized water, stir vigorously for 30 min, add 50 mL of a solution with a NaBH₄ concentration of 0.53 mol / L and a NaOH concentration of 0.5 mol / L, continue to stir vigorously for 30 min to fully reduce it, then wash the solid sample with deionized water until the supernatant is neutral, and finally dry it at 60 °C for 12 h to obtain Au-TNT;

[0060] S5. Place 0.5 g of the said Au-TNT and 0.25 mg of octadecylphosphonic acid (OPA) in 50 mL of absolute ethanol, soak for 12 h, stir for 10 min every hour in the first 6 h, and stir continuously in the last 6 h. Centrifuge the reaction mixture solution, collect the solid sample, wash it with ethanol to remove the free OPA, and then dry it under vacuum at 60 °C to obtain the titanium dioxide-based photocatalyst (OPA / Au-TNT).

[0061] Example 3

[0062] A titanium dioxide-based photocatalyst, comprising titanium nanotubes, octadecylphosphonic acid and Pt;

[0063] The said titanium nanotubes are used as carriers, and the said octadecylphosphonic acid and the said Pt are loaded on the said titanium nanotubes;

[0064] The diameter of the said titanium nanotubes is 3.0 - 5.0 nm; the loading amount of octadecylphosphonic acid on the titanium nanotubes is 0.05 wt%, and the loading amount of Pt on the titanium nanotubes is 0.5 wt%;

[0065] The preparation method of the said titanium dioxide-based photocatalyst comprises the following steps:

[0066] S1. Mix 3 g of commercial P25 and 70 mL of 10 mol / L sodium hydroxide aqueous solution at room temperature and stir for 30 min, then transfer the mixed solution to a 100 mL stainless steel autoclave with a polytetrafluoroethylene liner, heat and react at 140 °C for 22 h; after the reaction mixture solution is cooled to room temperature, centrifuge to collect the white product, wash it with deionized water until the supernatant is neutral, and dry it at 60 °C for 12 h to obtain NaTNT (na-type TNT);

[0067] S2. Blend the said NaTNT with 100 mL of 0.1 mol / L nitric acid solution, stir for 6 h, filter, wash with deionized water, and dry under vacuum at 60 °C for 12 h to obtain HTNT;

[0068] S3. Calcinate the said HTNT at 450 °C for 2 h to obtain TNT;

[0069] S4. Add 0.5 g of the above-mentioned TNT and 0.025 g of chloroplatinic acid (H2PtCl6) into 50 mL of deionized water, stir vigorously for 30 min, add 50 mL of a solution with a NaBH4 concentration of 0.53 mol / L and a NaOH concentration of 0.5 mol / L, continue to stir vigorously for 30 min to fully reduce it, then wash the solid sample with deionized water until the supernatant is neutral, and finally dry it at 60 °C for 12 h to obtain Pt-TNT;

[0070] S5. Place 0.5 g of the above-mentioned Pt-TNT and 0.25 mg of octadecylphosphonic acid (OPA) in 50 mL of absolute ethanol, soak for 12 h, stir for 10 min every hour in the first 6 h, and stir continuously in the last 6 h. Centrifuge the reaction mixture solution, collect the solid sample, wash it with ethanol to remove free OPA, and then dry it under vacuum at 60 °C to obtain a titanium dioxide-based photocatalyst (OPA / Pt-TNT).

[0071] Application Example

[0072] A device for continuously synthesizing hydrogen peroxide at a three-phase interface by photocatalysis, wherein the device for continuously synthesizing hydrogen peroxide at a three-phase interface uses a titanium dioxide-based photocatalyst as a catalyst;

[0073] The device for continuously synthesizing hydrogen peroxide at a three-phase interface is provided with a three-phase interface photocatalytic reactor, a water storage tank, a hydrogen peroxide storage tank, a high-efficiency atomizer and an external power supply;

[0074] The three-phase interface photocatalytic reactor includes a photocatalytic reaction cavity and an ultraviolet lamp; the photocatalytic reaction cavity is a cylinder with a hollow cavity inside; the top of the photocatalytic reaction cavity (on both sides of the upper part of the cylinder) is respectively provided with a liquid inlet and a liquid outlet; porous ceramic filters are respectively arranged at the liquid inlet and the liquid outlet.

[0075] Peristaltic pumps are respectively arranged between the water storage tank and the three-phase interface photocatalytic reactor, between the three-phase interface photocatalytic reactor and the hydrogen peroxide storage tank, and between the hydrogen peroxide storage tank and the high-efficiency atomizer.

[0076] Figure 1 The schematic diagram of the device for continuously synthesizing hydrogen peroxide at a three-phase interface prepared in the application example is shown;

[0077] Reference numerals in the drawings: 1 - reactor, 11 - photocatalytic reaction cavity, 111 - liquid inlet, 112 - liquid outlet, 12 - ultraviolet lamp, 2 - water storage tank, 3 - hydrogen peroxide storage tank, 4 - high-efficiency atomizer, 5 - external power supply, 7 - peristaltic pump.

[0078] Figure 2 The schematic diagram of the three-phase interface photocatalytic reactor in the application example is shown.

[0079] The device for continuous three-phase interfacial photocatalytic synthesis of hydrogen peroxide in the present invention generates H2O2 through a photocatalytic one-electron two-step oxygen reduction reaction at the three-phase interface. The reaction formula is as follows:

[0080] O2 + e - →·O 2- ;

[0081] ·O 2- + 2H + 2e - →H2O2.

[0082] Therefore, the photocatalytic material should be selected with appropriate density and hydrophobic and lipophilic properties to facilitate the photocatalyst to settle well at the water-oil two-phase interface, realizing the performance of efficient photocatalytic synthesis of H2O2 at the three-phase interface and improving the efficiency of H2O2 production. In the embodiment of the present invention, the photocatalytic material selects octadecylphosphoric acid and nickel, gold or platinum-loaded titanium dioxide nanotubes, and in specific production implementations, different surface modifiers and one of other metals can also be used.

[0083] Test Example

[0084] Test Method:

[0085] Slowly add 5 mL of benzyl alcohol and 35 mL of deionized water to the three-phase interfacial photocatalytic reactor, and then slowly add 8 mg of OPA / Ni-TNT prepared in Example 1 to form a photocatalytic reaction system; use 3 mol / L of H2SO4 to adjust the pH of the system to 3.0, and let it stand for 10 min until the catalyst basically settles at the interface, and then continuously aerate the system. The ultraviolet light irradiated by a xenon lamp with 1000 mw / cm 2 is used above the three-phase interfacial photocatalytic reactor. Under the condition that the system temperature is maintained at 30 °C, every 15 min, 0.5 mL of the solution is sucked from the reactor with a disposable syringe, filtered with a 0.45 μm filter head, and then the concentration of H2O2 is measured by the ultraviolet spectrophotometry of DPD-POD.

[0086] The test results are shown in Table 1 and Figure 3 as follows:

[0087] Table 1 Test Results of Three-Phase Interfacial Photocatalytic Reaction for Synthesizing H2O2

[0088] Time (min) 0 15 30 45 60 75 <![CDATA[H2O2 (μmol / L)]]> 0 262 547 879 1161 1669

[0089] Figure 3 Shows the graph of the yield of H2O2 photocatalytically synthesized under ultraviolet light by OPA / Ni-TNT prepared in Example 1.

[0090] The test results show that the yield of H2O2 synthesized by photocatalysis of OPA / Ni-TNT prepared in Example 1 of the present invention is relatively high, and the yield within 75 minutes is as high as 1669 μmol / L.

[0091] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above-described exemplary embodiments, and without departing from the spirit or basic characteristics of the present invention, the present invention can be implemented in other specific forms. Therefore, in any regard, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be encompassed by the present invention.

[0092] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative manner of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A titanium dioxide-based photocatalyst, characterized in that, The titanium dioxide-based photocatalyst includes titanium nanotubes, a surface modifier, and a metal; The titanium nanotubes serve as a carrier, the surface modifier and the metal are loaded on the titanium nanotubes, and the surface modifier is selected from one or more of octadecyl phosphoric acid, triethoxyoctylsilane, or fluorosilane; The preparation method of the titanium dioxide-based photocatalyst includes the following steps: S1. Hydrothermally react TiO2 to obtain NaTNT; S2. Blend and react the NaTNT with an acid to obtain HTNT; S3. Calcinate the HTNT to obtain TNT; S4. Blend and react the TNT with a metal salt to obtain metal-TNT; S5. Blend and react the metal-TNT with a surface modifier to obtain the titanium dioxide-based photocatalyst.

2. The titanium dioxide-based photocatalyst according to claim 1, wherein The metal is selected from one or more of Au, Pt, or Ni.

3. The titanium dioxide-based photocatalyst according to claim 1, wherein The diameter of the titanium nanotubes is 3 - 8 nm.

4. The titanium dioxide-based photocatalyst according to claim 1, wherein The loading amount of the surface modifier on the titanium nanotubes is 0.01 - 0.2 wt%; the loading amount of the metal on the titanium nanotubes is 0.1 - 2 wt%.

5. The titanium dioxide-based photocatalyst according to claim 1, wherein, In step S1, the temperature of the hydrothermal reaction is 130 - 170 °C, and the time is 15 - 25 h.

6. The titanium dioxide-based photocatalyst according to claim 1, characterized in that, In step S3, the temperature of the calcination is 300 - 500 °C, and the time is 1 - 3 h.

7. A continuous three-phase interface photocatalytic device for synthesizing hydrogen peroxide, characterized in that, Use the titanium dioxide-based photocatalyst according to any one of claims 1 - 6 as a catalyst.

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