Catalyst for photocatalytic degradation of ozone as well as preparation method and application of catalyst

Abstract

The invention belongs to the technical field of photocatalysis, and particularly relates to a catalyst for photocatalytic degradation of ozone as well as a preparation method and application of the catalyst. The invention provides brominated TiO2 and provides a method for degrading ozone by using the brominated TiO2 as a catalyst. The method provided by the invention is driven by an ultraviolet light source, is carried out under mild conditions, can efficiently degrade ozone, is low in energy consumption and free of secondary pollution, and can be widely applied to multiple fields such as water treatment and atmospheric pollutant degradation. The brominated TiO2 photocatalyst is synthesized by directly brominating TiO2 through HBr, and the synthesis method is simple, mild in reaction condition, safe and controllable, is suitable for industrial large-scale production, and shows a wide market application prospect.

Description

Technical Field

[0001] The present invention relates to the field of preparation of ozone photocatalytic materials, and in particular, to a catalyst for photocatalytic degradation of ozone, a preparation method thereof, and an application thereof. Background Art

[0002] As a strong oxidant, ozone (O3) is widely used in fields such as medical disinfection and water treatment. However, its excessive presence can cause serious harm to human health and the ecological environment. Research shows that ozone can stimulate the respiratory mucosa, induce respiratory diseases such as asthma, and react with volatile organic compounds (VOCs) to generate secondary pollutants (such as formaldehyde and peroxyacetyl nitrate), exacerbating photochemical smog pollution. In addition, if the unconsumed ozone in industrial wastewater treatment is directly discharged, it may disrupt the ecological balance of water bodies and threaten the safety of aquatic organisms. At present, the degradation of ozone mainly relies on methods such as activated carbon adsorption and thermal decomposition. However, these technologies generally have defects such as limited adsorption capacity (activated carbon is easily saturated), high energy consumption (thermal decomposition requires a high temperature of above 400 °C), and secondary pollution (the liquid medicine absorption method generates waste liquid), and it is difficult to meet the requirements of efficient and low-cost treatment. Therefore, it is urgent to develop an environmentally friendly, low-energy-consuming and sustainable ozone degradation technology. Due to its green and low-carbon characteristics, photocatalytic technology has been explored for pollutant degradation in recent years, but its application in the field of ozone treatment is still in its infancy. Existing photocatalytic research mostly focuses on the degradation of VOCs, organic wastewater or sterilization (such as using TiO2 to decompose formaldehyde or kill Escherichia coli), and there are few reports on the direct photocatalytic degradation of ozone. Summary of the Invention

[0003] Based on the problems existing in the prior art, the purpose of the present invention is to provide a catalyst for photocatalytic degradation of ozone, a preparation method thereof, and an application thereof. Compared with the current methods for degrading ozone such as activated carbon adsorption and thermal decomposition, applying the brominated TiO2 photocatalyst to photocatalytic degradation of ozone can significantly improve the ozone degradation efficiency and has broad application prospects.

[0004] In the experiment of photocatalytic degradation of ozone by the inventors of the present application, it was surprisingly found that TiO2 treated with HBr solution showed better photocatalytic performance. Especially when 2.5 ml of HBr solution (48 wt%) was added to each gram of TiO2, a removal rate of up to 79.8% was shown for 90 ppm of ozone gas in 30 min. Based on this, the inventors completed the following present invention.

[0005] In the first aspect of the present invention, a preparation method of a catalyst is provided, and the preparation method includes the following steps: Step 1: Add 1 - 3.5 ml of HBr solution to each gram of TiO2 and mix evenly; Step 2: Under dark conditions, seal the TiO2 mixed with HBr in Step 1; Step 3: After the sealing treatment in Step 2 is completed, open the lid and wait for the HBr in the container to volatilize naturally; Step 4: Wash the sample after volatilization in Step 3, dry it, and then grind it to obtain the brominated TiO2 photocatalyst.

[0006] According to some embodiments of the present invention, the TiO2 in Step 1 is nano-TiO2, and the particle size is controlled within 100 nm. An overly large size of TiO2 is not conducive to improving the catalytic efficiency. The mass concentration of the HBr solution is controlled at 48% to provide a sufficient bromide ion concentration to drive bromination. An overly high concentration of the HBr solution is likely to cause the structure of TiO2 to be damaged.

[0007] As a preferred embodiment, the particle size of the TiO2 is controlled within 30 nm. TiO2 within this particle size range exhibits good performance in the photocatalytic degradation of ozone after bromination treatment.

[0008] According to some embodiments of the present invention, the mixing method in Step 1 can be carried out by magnetic stirring. The stirring time is generally controlled within 40 - 50 min, and the rotation speed of the stirrer is generally controlled within 550 - 650 r / min.

[0009] As a preferred embodiment, the magnetic stirring time is controlled at 45 min, and the rotation speed is controlled at 600 r / min, which can ensure that the TiO2 is completely dispersed after stirring and that the HBr and TiO2 are in full contact; When the stirring rotation speed is lower or the time is shorter, the TiO2 aggregates cannot be well dispersed after stirring, which is likely to cause the HBr to act only on the surface of some particles, resulting in uneven bromination; when the stirring rotation speed is higher or the time is longer, it is likely to affect the structural characteristics of TiO2, damaging or significantly changing the surface morphology and crystal form of TiO2.

[0010] According to some embodiments of the present invention, the sealing time under dark conditions in Step 2 is generally controlled within 20 - 28 h to ensure the full reaction of HBr and TiO2 and enhance the ability of TiO2 to generate free radicals.

[0011] As a preferred embodiment, the sealing time under dark conditions in Step 2 is controlled at 24 h. Under this condition, the reaction process between HBr and TiO2 can be better balanced; When the sealing time is longer, it is likely to cause excessive acid etching of the TiO2 lattice by HBr, damaging the structure of TiO2; when the sealing time is shorter, the bromination effect of HBr on TiO2 is not ideal, and it cannot well enhance the ability of TiO2 to generate free radicals.

[0012] According to some embodiments of the present invention, the natural evaporation time after opening the lid in step three is generally controlled within 10 - 14h to balance the residual amount of free HBr and protect the catalyst structure.

[0013] As a preferred embodiment, the natural evaporation time after opening the lid is controlled at 12h. Under this condition, the residual amount of free HBr can be better balanced, avoiding over - modification or difficult cleaning. When the natural evaporation time is longer, it is easy for environmental moisture to invade, affecting the purity of the catalyst; when the evaporation time is shorter, there is too much HBr residue, and HBr reacts rapidly with a large amount of water or ethanol to release heat, causing a local temperature rise of TiO2, accelerating particle aggregation or causing damage to the TiO2 structure.

[0014] In the second aspect of the present invention, a catalyst is provided, which is prepared by the above - mentioned catalyst preparation method.

[0015] According to some embodiments of the present invention, the catalyst is a photocatalyst.

[0016] In the third aspect of the present invention, an application of the catalyst prepared by the above - mentioned catalyst preparation method is provided, including a method for degrading ozone using the catalyst as a photocatalyst.

[0017] According to some embodiments of the present invention, the method for degrading ozone using the catalyst as a photocatalyst includes placing the catalyst in a reaction device, introducing air containing ozone at a certain concentration, and performing light irradiation treatment on the inside of the reaction device at normal temperature and pressure to degrade ozone with the photocatalyst.

[0018] According to some embodiments of the present invention, the method for degrading ozone using the catalyst as a photocatalyst includes: evenly distributing the brominated TiO2 photocatalyst on a frosted glass sheet; placing the glass sheet carrying the photocatalyst into the reaction device and sealing it with a transparent lid; first introducing air into the ozone generator to stably generate a certain amount of ozone, and then introducing it into the reaction device; turning on the light source, and the optical fiber passes through the transparent lid and irradiates inside the reaction device.

[0019] According to some embodiments of the present invention, the concentration of ozone in the reactor is controlled at 60 - 120 ppm, and when the air flow rate is 0.8 - 1.2 L / min, the dosage of the catalyst is controlled at 0.1 - 0.3 g under this condition.

[0020] According to some embodiments of the present invention, the degradation of ozone by the photocatalyst is generally driven by ultraviolet light with a wavelength of 200 - 400 nm. Particularly, when the main wavelength of the light source radiation is controlled at 365 nm, better effects can be obtained.

[0021] Compared with the prior art, the present invention has at least the following beneficial effects: First, the present invention discloses for the first time the use of brominated TiO2 photocatalyst for photocatalytic degradation of ozone. Compared with the current methods of ozone degradation by activated carbon adsorption or thermal decomposition, which have the defects of limited adsorption capacity, low efficiency, large equipment size, and high energy consumption, the method of photocatalytic degradation of ozone using brominated TiO2 provided by the present invention has mild reaction conditions, simple equipment, no secondary pollution, helps to reduce the cost of ozone degradation, and meets the requirements of efficient and low-cost treatment.

[0022] Second, the brominated TiO2 photocatalyst provided by the present invention is prepared by directly brominating TiO2 catalyst with HBr. The synthesis method is simple and only requires steps such as stirring, sealed reaction, natural volatilization, and washing. The reaction conditions are mild and easy to control, and the whole process is carried out at normal temperature and pressure without solvent extraction, high-temperature calcination, or template agent assistance. The preparation time for a single batch is ≤48h, which is easy for large-scale production and has broad application prospects.

[0023] Third, traditional TiO2 can generate active species such as superoxide radicals and hydroxyl radicals under light irradiation, but the ability of untreated TiO2 to generate radicals is poor and the efficiency of ozone degradation is low. The present invention has substantially and significantly improved the catalytic efficiency of TiO2 for ozone through HBr bromination treatment. This method does not require noble metal doping or the addition of complex structures, and only realizes the improvement of catalytic efficiency through simple chemical treatment, overcoming the technical prejudice that TiO2 has low photocatalytic degradation efficiency and is difficult to be directly applied to ozone treatment.

[0024] Other advantages, objectives, and features of the present invention will be partially reflected by the following description and partially understood by those skilled in the art through the research and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is a flow chart of the preparation method of the brominated TiO2 photocatalyst provided by the present invention; Figure 2 is an XRD diagram of the brominated TiO2 photocatalyst obtained in Examples 1 to 5 of the present invention; Figure 3 is a TEM diagram of the brominated TiO2 photocatalyst obtained in Example 3 of the present invention and pure TiO2; Figure 4 is the ozone degradation performance of the brominated TiO2 photocatalyst obtained in Examples 1 to 5 of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0026] The following will clearly and completely describe the technical solutions in the embodiments of the present application in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative efforts fall within the scope of protection of the present application.

[0027] The terms "first", "second", and "third" in the present application are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first", "second", and "third" may explicitly or implicitly include multiple such features. In the description of the present application, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined. All directional indications (such as up, down, left, right, front, back...) in the embodiments of the present application are only used to explain the relative positional relationship and movement conditions between components in a specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indications will also change accordingly. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or modules is not limited to the listed steps or modules, but optionally further includes steps or modules not listed, or optionally further includes other steps or modules inherent to these processes, methods, products, or devices.

[0028] Referring to "embodiments" herein means that the specific features, structures, or characteristics described in connection with the embodiments may be included in multiple embodiments of the present application. The phrase appears at various positions in the specification and does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein may be combined with other embodiments.

[0029] The experimental methods used in the embodiments of the present invention are conventional methods unless otherwise specified, and the reagents and materials used are commercially available unless otherwise specified.

[0030] Please refer to Figure 1 , the preparation method of the HBr brominated TiO2 photocatalyst provided by the present invention is as follows: S101: Add 1 - 3.5 ml of HBr to each gram of TiO2 and stir magnetically; S102: After sealing the product in the dark, then open the lid to volatilize; S103: Wash and centrifuge the volatilized sample with water and ethanol multiple times; S104. The sample of the last wash can be ground after drying to obtain brominated TiO2; Traditional TiO2 can generate reactive species such as superoxide radicals and hydroxyl radicals under light irradiation. However, untreated TiO2 has poor ability to generate radicals and low efficiency in degrading ozone. In the present invention, TiO2 is brominated with HBr, which enhances the ability of TiO2 to generate radicals under light irradiation and improves its catalytic efficiency for ozone; It should be noted that in S101, the TiO2 is nano-TiO2 with a particle size controlled within 100 nm. Too large a size of TiO2 is not conducive to improving the catalytic efficiency; the mass concentration of the HBr solution is controlled at 48%. At this mass concentration, HBr can provide a sufficient bromide ion concentration to drive bromination and prevent the structure of TiO2 from being damaged due to too high a concentration of the HBr solution.

[0031] It should be noted that in S101, the magnetic stirring time is 45 min and the rotation speed is 600 r / min. Under these stirring conditions, it can be ensured that TiO2 is completely dispersed after stirring and HBr is in full contact with TiO2; when the stirring rotation speed is lower or the time is shorter, TiO2 aggregates cannot be well dispersed after stirring, which easily leads to HBr acting only on the surface of some particles and uneven bromination; when the stirring rotation speed is higher or the time is longer, it is easy to affect the structural characteristics of TiO2, damaging or greatly changing the surface morphology and crystal form of TiO2.

[0032] It should be noted that in S102, the closed time in the dark condition is 24 h. Under this closed time, the reaction process between HBr and TiO2 can be better balanced; when the closed time is longer, it is easy to cause excessive acid etching of the TiO2 lattice by HBr and damage the structure of TiO2; when the closed time is shorter, the bromination effect of HBr on TiO2 is not ideal and cannot well enhance the ability of TiO2 to generate radicals.

[0033] It should be noted that in S102, the natural evaporation time after opening the lid is controlled at 12 h. Under this evaporation time, the residual amount of free HBr can be better balanced to avoid over-modification or difficult cleaning; when the natural evaporation time is longer, it is easy for environmental moisture to invade and affect the purity of the catalyst; when the evaporation time is shorter, there is too much residual HBr, and HBr reacts rapidly with a large amount of water or ethanol to release heat, causing a local temperature rise of TiO2, accelerating particle aggregation or causing damage to the structure of TiO2.

[0034] To make the method of the present invention clearer, the characteristics and performance of the catalyst provided by the present invention will be further described below in combination with data, charts, etc. in the test process: Example 1. A preparation method of HBr-brominated TiO2 photocatalyst, comprising the following steps: Add 1 ml of HBr (48 wt%) to 1 g of TiO2 (specific surface area 35 to 65 m 2 / g, average particle size 21 nm), stir magnetically for 45 min at a rotation speed of 600 r / min. After taking out the stir bar, seal it in the dark for 24 h, then open the lid and volatilize for 12 h. Collect the lower-layer sample, dispense it into centrifuge tubes; perform high-speed centrifugation with a centrifugation speed of 5000 rpm and a centrifugation time of 2 min to precipitate it; add 30 ml of ultrapure water or ethanol to the precipitate to redisperse the precipitate colloid. After high-speed centrifugation again, remove the supernatant; wash the precipitate with water and ethanol repeatedly by centrifugation 4 times, place it in an oven at 60 °C and dry for 10 h. After cooling, put it into an agate mortar and grind it into fine powder to obtain the brominated TiO2 photocatalyst.

[0035] Example 2. A preparation method of HBr-brominated TiO2 photocatalyst, comprising the following steps: Add 2 ml of HBr (48 wt%) to 1 g of TiO2 (specific surface area 35 to 65 m 2 / g, average particle size 21 nm), stir magnetically for 45 min at a rotation speed of 600 r / min. After taking out the stir bar, seal it in the dark for 24 h, then open the lid and volatilize for 12 h. Collect the lower-layer sample, dispense it into centrifuge tubes; perform high-speed centrifugation with a centrifugation speed of 5000 rpm and a centrifugation time of 2 min to precipitate it; add 30 ml of ultrapure water or ethanol to the precipitate to redisperse the precipitate colloid. After high-speed centrifugation again, remove the supernatant; wash the precipitate with water and ethanol repeatedly by centrifugation 4 times, place it in an oven at 60 °C and dry for 10 h. After cooling, put it into an agate mortar and grind it into fine powder to obtain the brominated TiO2 photocatalyst.

[0036] Example 3. A preparation method of HBr-brominated TiO2 photocatalyst, comprising the following steps: Add 2.5 ml of HBr (48 wt%) to 1 g of TiO2 (specific surface area 35 to 65 m 2 / g, average particle size 21 nm), stir magnetically for 45 min at a rotation speed of 600 r / min. After taking out the stir bar, seal it in the dark for 24 h, then open the lid and volatilize for 12 h. Collect the lower-layer sample, dispense it into centrifuge tubes; perform high-speed centrifugation with a centrifugation speed of 5000 rpm and a centrifugation time of 2 min to precipitate it; add 30 ml of ultrapure water or ethanol to the precipitate to redisperse the precipitate colloid. After high-speed centrifugation again, remove the supernatant; wash the precipitate with water and ethanol repeatedly by centrifugation 4 times, place it in an oven at 60 °C and dry for 10 h. After cooling, put it into an agate mortar and grind it into fine powder to obtain the brominated TiO2 photocatalyst.

[0037] Example 4. A preparation method of HBr-brominated TiO2 photocatalyst, comprising the following steps: Add 3 ml of HBr (48 wt%) to 1 g of TiO2 (specific surface area 35 to 65 m 2 / g, average particle size 21 nm), magnetically stir for 45 min at a rotation speed of 600 r / min. After taking out the stirrer, seal it in the dark for 24 h, then open the lid and volatilize for 12 h. Collect the lower-layer sample, sub-pack it into centrifuge tubes; perform high-speed centrifugation with a centrifugation speed of 5000 rpm and a centrifugation time of 2 min to precipitate it; Add 30 ml of ultrapure water or ethanol to the precipitate to redisperse the precipitate colloid. After high-speed centrifugation again, remove the supernatant; Wash the precipitate with water and ethanol repeatedly by centrifugation 4 times, place it in an oven at 60 °C and dry for 10 h. After cooling, put it into an agate mortar and grind it into fine powder to obtain brominated TiO2 photocatalyst.

[0038] Example 5. A preparation method of HBr-brominated TiO2 photocatalyst, comprising the following steps: Add 3.5 ml of HBr (48 wt%) to 1 g of TiO2 (specific surface area 35 to 65 m 2 / g, average particle size 21 nm), magnetically stir for 45 min at a rotation speed of 600 r / min. After taking out the stirrer, seal it in the dark for 24 h, then open the lid and volatilize for 12 h. Collect the lower-layer sample, sub-pack it into centrifuge tubes; perform high-speed centrifugation with a centrifugation speed of 5000 rpm and a centrifugation time of 2 min to precipitate it; Add 30 ml of ultrapure water or ethanol to the precipitate to redisperse the precipitate colloid. After high-speed centrifugation again, remove the supernatant; Wash the precipitate with water and ethanol repeatedly by centrifugation 4 times, place it in an oven at 60 °C and dry for 10 h. After cooling, put it into an agate mortar and grind it into fine powder to obtain brominated TiO2 photocatalyst.

[0039] Please refer to Figure 2 , Figure 2 which is the XRD pattern of the brominated TiO2 photocatalyst prepared in Examples 1 to 5 of the present invention. It can be seen from the figure that the characteristic peaks of the photocatalysts synthesized in Examples 1 to 5 are all consistent with the TiO2 standard card, and the peak positions and peak intensities hardly change, indicating that the crystal form of the brominated TiO2 prepared by adding HBr in the present invention has not been changed.

[0040] Please refer to Figure 3 , Figure 3 which is the TEM image of the brominated TiO2 photocatalyst in Example 3 of the present invention. It can be seen from the figure that after adding 2.5 ml of HBr with a mass concentration of 48% to the TiO2 catalyst and performing a closed treatment for 24 h, the obtained brominated TiO2 photocatalyst has no obvious difference in morphology compared with pure TiO2, and no obvious changes in size or structural characteristics occur.

[0041] To better illustrate the beneficial effects that can be achieved by the brominated TiO2 photocatalyst of the present invention and its preparation method, the following application examples are also provided in this application: Application Example 1, Application of the brominated TiO2 photocatalyst, including using the brominated TiO2 photocatalyst to degrade ozone, specifically including the following steps: Step 1: Uniformly distribute 0.2 g or more of the brominated TiO2 photocatalysts obtained in Examples 1 to 5 and pure TiO2 on 4 pieces of frosted glass sheets with a size of 0.4×1 cm, respectively; Step 2: Place the frosted glass sheets in Step 1 into a reactor with a quartz glass lid; Step 3: First, introduce pure air into the ozone generator at a flow rate of 1 L / min to stably generate ozone with a concentration of 90 ppm, and then introduce the reaction gas mixed with ozone into the reactor in Step 2; Step 4: Irradiate the photocatalyst in the reactor with ultraviolet light having a radiation wavelength of 365 nm and a high-pressure mercury lamp with a rated power of 300 W. Under the irradiation condition, continuously sample with a Model106L ozone detector for 30 min every minute.

[0042] Please refer to Figure 4 , Figure 4 for the performance of the brominated TiO2 photocatalysts obtained in Examples 1 to 5 of the present invention and pure TiO2 in degrading ozone; Figure 4 In [the figure], A is a graph showing the change of ozone concentration with time under different catalysts. It can be seen from it that the catalysts treated with HBr (such as 1.0 ml, 2.0 ml, 2.5 ml, etc.) have a lower final concentration compared to pure TiO2, indicating that the brominated TiO2 photocatalyst has a significantly improved degradation efficiency for ozone. Figure 4 In [the figure], B is the ozone conversion rate under different catalysts. The data in the figure shows that as the volume of HBr increases, the ozone conversion rate shows a significant change. When 2.5 ml of HBr (48 wt%) is added per gram of TiO2, it reaches a maximum value of 79.8%, which is more than 10% higher than that of pure TiO2. Thus, it can be seen that through the HBr bromination treatment of the present invention, the catalytic efficiency of TiO2 for ozone has been substantially and significantly improved, and high-efficiency ozone degradation can be achieved under mild conditions (room temperature, normal pressure, ultraviolet light), meeting the requirements of high efficiency and low cost for treatment.

[0043] Therefore, the present invention has the technical problem that the traditional ozone degradation method cannot achieve high efficiency and low energy consumption at the same time. The brominated TiO2 photocatalyst is prepared by a simple HBr direct bromination TiO2 method. This photocatalyst can efficiently degrade ozone under mild conditions through a photocatalytic reaction, solving the problems of low adsorption capacity and high energy consumption in the current ozone degradation methods. At the same time, the preparation method of the photocatalyst of the present invention is simple and the conditions are mild. The single-batch preparation time can be controlled within 48 hours, which is easy for large-scale production, providing strong support for the photocatalytic degradation of ozone in actual working conditions and having broad market application prospects.

[0044] Although the embodiments of the present invention have been disclosed as above, they are not limited to the applications listed in the specification and embodiments. It can be fully applied to various fields suitable for the present invention. For those familiar with the field, additional modifications can be easily achieved. Therefore, without departing from the general concept defined by the claims and the equivalent scope, the present invention is not limited to the specific details and the illustrated examples here.

Claims

1. A preparation method of a brominated TiO2 photocatalyst, characterized in that, It includes the following steps: Step 1: Add 1 - 3.5 ml of HBr solution to each gram of TiO2, and stir to mix evenly. Step 2: Under dark conditions, seal the TiO2 mixed with HBr in Step 1. Step 3: After the sealing treatment in Step 2 is completed, open the lid and wait for the HBr in the container to naturally volatilize. Step 4: Wash the sample after volatilization in Step 3, dry it, and grind it to obtain the brominated TiO2 photocatalyst.

2. The preparation method of the brominated TiO2 photocatalyst according to claim 1, characterized in that, In Step 1, the TiO2 is nano-TiO2, and the mass concentration of the HBr solution is 48%.

3. The preparation method of the brominated TiO2 photocatalyst according to claim 1, characterized in that, In Step 1, magnetic stirring is used for mixing, the stirring time is 40 - 50 min, and the rotation speed is 550 - 650 r / min.

4. The preparation method of the brominated TiO2 photocatalyst according to claim 1, characterized in that, In Step 2, the sealing time under dark conditions is 20 - 28 h.

5. The preparation method of the brominated TiO2 photocatalyst according to claim 1, characterized in that, In Step 3, the natural volatilization time after opening the lid is 10 - 14 h.

6. A brominated TiO2 photocatalyst, characterized in that, It is prepared by the preparation method of the brominated TiO2 photocatalyst according to any one of Claims 1 to 5.

7. An application of the brominated TiO2 photocatalyst prepared by the preparation method of the brominated TiO2 photocatalyst according to any one of Claims 1 to 5 in photocatalytic degradation of ozone.

8. The application according to claim 7, wherein In the photocatalytic degradation of ozone, ultraviolet light with a wavelength of 200 - 400 nm is used as the light source.

9. The application according to claim 7, characterized in that, In the photocatalytic degradation of ozone, air with an ozone concentration of 60 - 120 ppm is used, and 0.1 - 0.3 g of the brominated TiO2 photocatalyst is used to degrade ozone.

10. The application according to claim 7, wherein The photocatalytic degradation of ozone includes: placing 0.1 - 0.3 g of the brominated TiO2 photocatalyst in a reactor, introducing air with an ozone concentration of 60 - 120 ppm into the reactor at a flow rate of 1 L / min, and reacting under 300 W, 365 nm ultraviolet light irradiation for 30 min, with an ozone degradation rate ≥ 74%.

Images