A bifunctional titanium-based material, a preparation method and application thereof

Abstract

The application discloses a bifunctional titanium-based material and a preparation method and application thereof, first Ti3C2-MXene nanosheets are prepared, and the problem of insufficient oxidation caused by multi-layer accumulation is avoided, then a new bifunctional titanium-based material with adsorption and photocatalytic performance is prepared by a one-step oxidation method under ultraviolet excitation with hydrogen peroxide as an oxidant, Ti 2+ (Ti-O) is oxidized into per-Ti 4+ (titanium peroxide), meanwhile, Ti-C covalent bonds in the internal structure of the broken Ti3C2 crystal form new Ti-O surfaces, the material has a micro three-dimensional porous structure, can exert the synergistic complementary advantages of adsorption and photocatalysis, the degradation rate of RhB reaches more than 80% within 20 minutes, more than 90% within two hours, and the material can be repeatedly used, is suitable for large-scale production and preparation, and has a good application prospect in the fields of sewage and waste gas treatment.

Description

TECHNICAL FIELD

[0001] The present application relates to a new material, in particular to a kind of bifunctional titanium-based material and its preparation method and application, the material is integrated with adsorption and photocatalytic function;Belong to functional material technical field. BACKGROUND

[0002] Since the 21st century, with the rapid development of industry and the advancement of urbanization, fossil fuel consumption and water environmental pollution have received widespread attention. Rhodamine B (RhB) is the most typical organic pollutant, which is carcinogenic and difficult to degrade into non-toxic and harmless substances. Therefore, how to effectively remove dye pollutants in water has been a hot issue of general concern.

[0003] Currently, the main strategies for treating pollutants in water include biodegradation, advanced oxidation, photocatalytic degradation and adsorption, etc. Among them, the advantages of adsorption and photocatalysis are complementary, that is, the excellent adsorption performance of photocatalyst for organic pollutants can promote the photocatalytic degradation process, and the photocatalytic reaction after adsorption can degrade organic pollutants to a greater extent. Because of the complementary advantages of adsorption and photocatalysis, their synergistic effect has become the most promising industrial application treatment method. Therefore, more and more research tends to adsorption and photocatalytic degradation of organic pollutants.

[0004] Patent (CN106076366 A) discloses a short channel ordered mesoporous carbon loaded sulfur indium cobalt and sulfur indium nickel ternary composite photocatalyst and its preparation method, the photocatalyst has strong adsorption and visible light catalytic activity to VOCs, specifically, first, a mixture of surfactant, hydrochloric acid solution, ammonium fluoride and tetraethyl orthosilicate is reacted by sol-gel-hydrothermal-calcination in turn to obtain short channel ordered mesoporous silica, then the short channel ordered mesoporous silica is calcined with carbon source under nitrogen protection to obtain short channel ordered mesoporous carbon with adsorption function, finally, the pretreated short channel mesoporous carbon is mixed with cobalt salt, nickel salt, indium salt and reducing agent, and a ternary composite catalyst is prepared by hydrothermal reaction. Patent (CN108855011 A) discloses a composite material with adsorption-visible light catalytic degradation synergistic effect, first, iodine bismuth oxide / chlorine bismuth oxide composite nanoparticle loaded activated carbon fiber composite material ACF@BiOIxCl1-x is synthesized, its specific preparation method is as follows: bismuth nitrate pentahydrate and activated carbon fiber are dissolved in a solvent; potassium iodide and potassium chloride are dissolved in a solvent; under stirring conditions, the latter solution is added dropwise into the former solution, after mixing uniformly, the mixed solution is transferred into a hydrothermal reaction kettle, and reaction is carried out at 120-180℃ for 10-16 hours; after reaction is completed, the reaction kettle is taken out, cooled, opened, and the fibrous product is collected by filtration, washed, and dried to obtain the iodine bismuth oxide / chlorine bismuth oxide composite nanoparticle loaded activated carbon fiber composite material, then it is dispersed in a solvent, silane coupling agent is added, and stirring reaction is carried out at 60-80℃ for 4-8 hours, polyethyleneimine aqueous solution is further added, and stirring reaction is continued for 4-6 hours; after reaction is completed, the fibrous product is collected by cooling and filtration, washed, and dried to realize grafting of polyethyleneimine on the fiber surface, and the composite material with adsorption-visible light catalytic degradation synergistic effect PEI-g-ACF@BiOIxCl1-x is obtained.

[0005] Other related patents such as CN107824210 A, CN102489283B, CN106111053B and CN106381682B also disclose preparation methods of composite materials with adsorption / catalysis synergistic effect, and the preparation strategies of these patents can be summarized as follows: first, structural unit bodies with adsorption and catalysis functions are respectively prepared, and then the two are combined into a composite material with adsorption and catalysis functions by composite hybridization technology.

[0006] It can be seen that the existing technology has the disadvantages of complicated preparation process and long time, which greatly increases the manufacturing cost of the material. Therefore, how to simplify the preparation process and obtain a bifunctional material with adsorption and photocatalytic functions is a technical direction that needs to be studied. SUMMARY

[0007] In order to solve the problems of the prior art, the application provides a dual-functional titanium-based material with functions of adsorption and visible light catalysis obtained by one-step oxidation, and discloses a preparation method thereof, so as to provide a new feasible idea for structural design of new materials and realize efficient degradation of organic pollutants under darkness and visible light.

[0008] In order to achieve the above-mentioned target, the application adopts the following technical scheme:

[0009] The application discloses a preparation method of a dual-functional titanium-based material, comprising the following steps:

[0010] S1, preparing Ti3C2-MXene nanosheet:

[0011] Lithium fluoride is added to hydrochloric acid and stirred and dispersed; then 1-2 g of Ti3AlC2 powder is slowly added to the above solution, and after reaction for a period of time, the acidic solution after reaction is washed with deionized water until the pH approaches neutrality; then centrifugal treatment is performed to obtain a Ti3C2-MXene colloidal solution;

[0012] S2, preparing a dual-functional titanium-based material:

[0013] The Ti3C2-MXene colloidal solution obtained in step S1 is placed in a bacterial strain bottle, and then hydrogen peroxide solution is added thereto; under the condition of ultraviolet lamp irradiation, the solution is fully reacted at 20-40 DEG C for 4-6 h, and then freeze-drying is performed to obtain the dual-functional titanium-based material.

[0014] Preferably, in the aforementioned step S1, the reaction is performed at 35-55 DEG C for 12-24 h.

[0015] Preferably, in the aforementioned step S2, the concentration of the hydrogen peroxide solution is 3%.

[0016] Preferably, in the aforementioned step S2, the ultraviolet lamp irradiation level is 2-5.

[0017] More preferably, the aforementioned preparation method of the dual-functional titanium-based material comprises the following steps:

[0018] S1, preparing Ti3C2-MXene nanosheet:

[0019] In 15-20 mL of hydrochloric acid with a concentration of 9 M, 1-2 g of lithium fluoride is added and stirred and dispersed; then 1-2 g of Ti3AlC2 powder is slowly added to the above solution, and the reaction is performed at 35-55 DEG C for 12-24 h; the acidic solution after reaction is washed with deionized water until the pH approaches neutrality; then after centrifugal treatment at 500-5000 rpm for 1-2 h, a Ti3C2-MXene colloidal solution is obtained;

[0020] S2, preparing a dual-functional titanium-based material:

[0021] The Ti3C2-MXene colloidal solution obtained in step S1 is placed in a strain bottle, 5-20 mL of a 3% hydrogen peroxide solution is added, and the mixture is allowed to react at 20-40°C under the irradiation of a 4th-grade ultraviolet lamp for 4-6 h, and then freeze-dried to obtain the bifunctional titanium-based material.

[0022] The application also discloses a bifunctional titanium-based material prepared by the preparation method.

[0023] More preferably, the bifunctional titanium-based material is prepared by one-step oxidation on the surface of a Ti3C2-MXene sheet layer, has a micro three-dimensional porous structure, and has a degradation rate of RhB of more than 80% within 20 min and a degradation rate of RhB of more than 90% within 2 h.

[0024] More preferably, the catalyst comprises a novel heterojunction structure of amorphous titanium peroxide and anatase titanium dioxide.

[0025] The application also discloses application of the bifunctional titanium-based material in treating organic pollutants in sewage, in particular, in degrading rhodamine.

[0026] The application has the following advantages:

[0027] (1) In the application, titanium carbide (Ti3C2-MXene) nanosheets containing a large number of oxygen groups on the surface are first prepared, the problem of insufficient oxidation caused by the accumulation of multiple sheet layers is avoided, then hydrogen peroxide is used as an oxidant, a large number of free electrons are enriched on the surface of Ti3C2-MXene by ultraviolet light excitation, the oxidation ability of hydrogen peroxide is greatly promoted, Ti 2+ (Ti-O) on the surface of Ti3C2-MXene is oxidized to titanium peroxide (Ti 4+ ), and the Ti-C covalent bond in the internal structure of the broken Ti3C2 crystal is formed into a new Ti-O surface, thereby obtaining a novel heterojunction structure of amorphous titanium peroxide and anatase titanium dioxide.

[0028] (2) The novel dual-functional titanium-based material with adsorption and photocatalytic performance is prepared by one-step oxidation under ultraviolet radiation, the material has a micro three-dimensional porous structure, can play complementary advantages, and through the synergistic effect of adsorption and photocatalysis, the product has very excellent water treatment effect, the excellent adsorption performance of the material on organic pollutants can promote the photocatalytic degradation process, and the photocatalytic reaction after adsorption can degrade the organic pollutants to a greater extent, so that the material becomes a pollution treatment method with great industrial application prospect. It has been verified that the degradation rate of the material on RhB is more than 80% within 20 minutes, more than 90% within two hours, and the material can be reused.

[0029] (3) The preparation process of the application is simple, avoids high-temperature reaction process, greatly reduces energy consumption, and the prepared catalyst has novel structure and excellent pollutant degradation performance. Not only has good adsorption capacity on organic pollutants in the dark, but also has good photodegradation capacity on organic pollutants under visible light, and the material has recycling performance and reusability. At the same time, the preparation process does not use reagents harmful to the environment, has the advantages of high efficiency, energy saving, environmental protection, low cost, safety, etc., is suitable for large-scale production and preparation, and has good application prospect in the fields of wastewater treatment and waste gas treatment. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 Fig. 1 shows XRD patterns of the products of the application and comparative example 1-4;

[0031] Figure 2 Fig. 2 shows C1s XPS patterns of the products of the application and comparative example 1-4;

[0032] Figure 3 Fig. 3 shows SEM patterns of the products of the application and comparative example 1-4;

[0033] Figure 4 Fig. 4 shows UV-vis absorption spectra of the products of the application and comparative example 1-4;

[0034] Figure 5 Fig. 5 shows concentration change diagrams of the products of the application and comparative example 1-4 in degrading dye rhodamine B under dark conditions;

[0035] Figure 6 Fig. 6 shows concentration change diagrams of the products of the application and comparative example 1-4 in degrading dye rhodamine B under dark conditions and under 200W xenon lamp irradiation;

[0036] Figure 7 Fig. 7 shows degradation ratio diagrams of the products of the application and comparative example 1-4 in degrading dye rhodamine B under dark conditions and under 200W xenon lamp irradiation. Detailed Implementation

[0037] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0038] Unless otherwise specified, all raw materials used in this invention are commercially available.

[0039] Example 1

[0040] The preparation method of the bifunctional titanium-based material in this embodiment includes the following steps:

[0041] S1. Preparation of Ti3C2-MXene nanosheets:

[0042] 1 g of lithium fluoride was added to 15 mL of 9 M hydrochloric acid and stirred to disperse. Then, 1 g of Ti3AlC2 powder was slowly added to the above solution and reacted at 50 °C for 12 h. The acidic solution after the reaction was washed with deionized water until the pH was close to neutral. After centrifugation at 3500 rpm for 1 h, Ti3C2-MXene colloidal solution was obtained.

[0043] S2. Preparation of bifunctional titanium-based materials:

[0044] The Ti3C2-MXene colloidal solution obtained in step S1 was placed in a culture bottle, and 5 mL of 3% hydrogen peroxide solution was added. Under the radiation of a level 2 ultraviolet lamp, the solution was allowed to react fully at 35°C for 5 hours, and then freeze-dried to obtain a bifunctional titanium-based material.

[0045] Example 2

[0046] The preparation method of the bifunctional titanium-based material in this embodiment includes the following steps:

[0047] S1. Preparation of Ti3C2-MXene nanosheets:

[0048] 1 g of lithium fluoride was added to 15 mL of 9 M hydrochloric acid and stirred to disperse. Then, 1 g of Ti3AlC2 powder was slowly added to the above solution and reacted at 35 °C for 18 h. The acidic solution after the reaction was washed with deionized water until the pH was close to neutral. After centrifugation at 3500 rpm for 2 h, Ti3C2-MXene colloidal solution was obtained.

[0049] S2. Preparation of bifunctional titanium-based materials:

[0050] The Ti3C2-MXene colloidal solution obtained in step S1 was placed in a culture bottle, and 10 mL of 3% hydrogen peroxide solution was added. Under the radiation of a level 3 ultraviolet lamp, the solution was allowed to react fully at 20°C for 6 hours, and then freeze-dried to obtain a bifunctional titanium-based material.

[0051] Example Three

[0052] The method for preparing the bifunctional titanium-based material of the present example comprises the following steps:

[0053] S1, preparing Ti3C2-MXene nanosheets:

[0054] 2g of lithium fluoride was added into 20 mL of hydrochloric acid with a concentration of 9 M and stirred and dispersed; 2g of Ti3AlC2 powder was then slowly added into the above solution and reacted at 55°C for 20 h. The acidic solution after reaction was washed with deionized water until the pH was close to neutral. After centrifugation at 2000 rpm for 2 h, a Ti3C2-MXene colloidal solution was obtained;

[0055] S2, preparing the bifunctional titanium-based material:

[0056] The Ti3C2-MXene colloidal solution obtained in step S1 was placed in a strain bottle, 15 mL of hydrogen peroxide solution with a concentration of 3% was then added into the strain bottle, and the solution was fully reacted at 40°C under the irradiation of a 4th-grade ultraviolet lamp for 6 h. After freeze-drying, the bifunctional titanium-based material was obtained.

[0057] Example Four

[0058] The method for preparing the bifunctional titanium-based material of the present example comprises the following steps:

[0059] S1, preparing Ti3C2-MXene nanosheets:

[0060] 2g of lithium fluoride was added into 20 mL of hydrochloric acid with a concentration of 9 M and stirred and dispersed; 2g of Ti3AlC2 powder was then slowly added into the above solution and reacted at 55°C for 20 h. The acidic solution after reaction was washed with deionized water until the pH was close to neutral. After centrifugation at 2000 rpm for 2 h, a Ti3C2-MXene colloidal solution was obtained;

[0061] S2, preparing the bifunctional titanium-based material:

[0062] The Ti3C2-MXene colloidal solution obtained in step S1 was placed in a strain bottle, 20 mL of hydrogen peroxide solution with a concentration of 3% was then added into the strain bottle, and the solution was fully reacted at 40°C under the irradiation of a 5th-grade ultraviolet lamp for 6 h. After freeze-drying, the bifunctional titanium-based material was obtained.

[0063] Comparative Example

[0064] In this comparative example, a layered Ti3C2-MXene photocatalyst was prepared. The process was as follows: 1 g of lithium fluoride (LiF) was added to 15 mL of 9M hydrochloric acid (HCl) and stirred for 5 minutes; 1 g of Ti3AlC2 powder was slowly added to the above mixed solution, and the reaction was carried out at 50 °C for 21 h. Then, the acidic solution after the reaction was washed with deionized water (DI) until the pH of the washing solution was close to neutral. After centrifugation at 3500 rpm for 1 h, a Ti3C2-MXene colloidal solution was obtained. After freeze-drying, layered Ti3C2-MXene nanopowder material was obtained.

[0065] Structural characterization and performance testing

[0066] (1) XRD structural characterization

[0067] Figure 1 The images, from top to bottom, are the XRD patterns of Examples 1-4 and the comparative example. Figure 1 As can be seen, in Examples 1-4, after hydrogen peroxide peroxidation treatment under ultraviolet radiation, amorphous broad peaks of titanium peroxide appeared at 7.5° and 20.5°. In addition, in Comparative Examples 1-4, diffraction peaks of TiO2 appeared at 63.3°, which belong to the anatase TiO2 (204) crystal plane.

[0068] The XRD analysis results indicate that H2O2 reacts with Ti3C2MXene to form titanium peroxide, while a small amount of anatase TiO2 is also generated.

[0069] (2) XPS characterization

[0070] Figure 2 The C1s XPS plots of Example 1 and the comparative example are shown from... Figure 2 As can be seen in Example 1, after ultraviolet light radiation and hydrogen peroxide oxidation treatment, the characteristic peaks of the Ti-C bond disappeared, indicating that the Ti-C covalent bonds in the internal structure of the Ti3C2 crystal were oxidized, corroded and broken.

[0071] (3) SEM morphological characterization

[0072] Figure 3 The images shown are surface scanning electron microscope (SEM) images of Embodiments 1-4 (Figures b-e) and Comparative Example (Figure a) of the present invention. Figure 3 As shown in Figure a, the product in the comparative example exhibits a layered structure, indicating that the prepared Ti3C2MXene is a layered material. In Examples 1-4, when H2O2 is added, the nanosheets are first transformed into porous nanosheets. As the H2O2 content increases, the layered porous structure connects, gradually forming a "three-dimensional porous" structure as shown in Figure d. However, when the H2O2 content is further increased to 20 mL, the three-dimensional porous structure tends to collapse, as shown in Figure e.

[0073] (4) UV-vis absorption spectrum

[0074] Figure 4 The UV-vis absorption spectrum of the adsorption / photocatalyst of the inventive examples and the comparative examples is shown. The examples show full spectrum absorption from UV to visible light due to the unique light absorption of the carbonaceous material. After peroxidation, the comparative sample has a clear absorption edge between 500-600 nm, indicating that the sample has strong absorption capacity for visible light after H2O2 treatment.

[0075] (5) Adsorption performance experiment

[0076] Experimental method: The adsorption performance of Rhodamine B was evaluated under dark conditions.

[0077] The specific evaluation method is as follows:

[0078] 1) 10 mg of photocatalyst was added to 100 mL of Rhodamine B solution (50 mg / mL) and adsorbed for 120 min in the dark;

[0079] 2) During the adsorption process, 3 mL of sample was collected every 5 minutes in the first 20 minutes, and 3 mL of sample was collected every 20 minutes in the last 100 minutes, and the degradation degree of the sample was determined by UV-vis spectrophotometer;

[0080] 3) The degradation rate of Rhodamine B (%) was calculated according to the change of the intensity of the 550 nm absorption peak in the measured solution absorption spectrum = 1-C t / C0=1-A t / A0. Wherein, C0and A0are the initial concentration of Rhodamine B in water and its absorbance at 550 nm before the experiment starts, C t and A t are the concentration of Rhodamine B in water and its absorbance at 550 nm after a certain time of adsorption.

[0081] Figure 5 The concentration change graph of the material prepared by the inventive examples 1~4 and the comparative example in the degradation of dye Rhodamine B under dark conditions is shown. According to Figure 5 It can be clearly seen that the MXene adsorption effect of the comparative example is poor, and the degradation rate of RhB is less than 10% within 120 min. After treatment by ultraviolet lamp irradiation and H2O2 peroxidation, the adsorption rate is greatly improved, and example 3 shows the best adsorption rate of RhB, which can adsorb more than 80% of RhB within 120 min.

[0082] (6) Adsorption / photocatalytic synergistic experiment

[0083] Experimental method: under visible light (λ> 420 nm) illumination, the photocatalytic degradation performance of rhodamine B was evaluated using a 300 W xenon lamp (CEL-HXF300, Beijing China Education Gold Light Co., Ltd.) with a light cutoff filter, and the light intensity was controlled to be 200 mW cm -2 .

[0084] The specific method is as follows:

[0085] 1) 10 mg of photocatalyst was added to 100 mL of rhodamine solution (100 mg / mL), and the solution was kept in the dark and under light for 120 min, respectively;

[0086] 2) During the experiment, 3 mL of sample was collected every 5 minutes for the first 20 minutes, and 3 mL of sample was collected every 20 minutes for the last 100 minutes, and the absorbance of the sample was determined by ultraviolet-visible spectrophotometer;

[0087] 3) The degradation rate (%) of rhodamine B was calculated according to the change in the intensity of the 550 nm absorption peak in the measured solution absorption spectrum = 1-C t / C0=1-A t / A0. Wherein, C0and A0are the initial concentration of rhodamine B in water and its absorbance at 550 nm before the experiment starts, C t and A t are the concentration of rhodamine B in water and its absorbance at 550 nm after adsorption or light for a certain time.

[0088] Figure 6 and Figure 7 The concentration change diagram of the catalyst prepared in examples 1-4 of the application under dark conditions and under 200W xenon lamp irradiation to degrade dye rhodamine B is shown. Compared with the adsorption effect under dark conditions, the removal efficiency of RhB of the catalyst prepared in examples 1-4 under visible light irradiation is significantly improved. The adsorption / photocatalyst prepared in all examples produces rapid degradation of RhB when it is contacted, and the degradation rate of examples 2 and 3 samples is more than 80% within 20 min, and all example samples also slowly and continuously degrade after 20 min, and the degradation rate is more than 90% within 120 min.

[0089] In summary, the application provides a new idea for designing and constructing a dual-functional titanium-based material integrating adsorption and photocatalytic functions, and a new material capable of efficiently degrading organic pollutants under dark and visible light conditions is obtained by the self-developed preparation method. The material utilizes hydrogen peroxide to efficiently degrade organic pollutants under dark and visible light conditions. The material utilizes hydrogen peroxide to efficiently degrade organic pollutants under dark and visible light conditions. xThe MXene is modified by peroxidation, and the applicant also surprisingly finds that the oxidation ability of hydrogen peroxide is promoted by the large number of free electrons enriched on the surface of Ti3C2-MXene by ultraviolet light excitation, the Ti 2+ (Ti-O) is oxidized into per-Ti 4+ (titanium peroxide), and meanwhile, the Ti-C covalent bond in the internal structure of the Ti3C2 crystal is broken to form a new Ti-O surface, a new heterojunction structure composed of amorphous titanium peroxide and anatase titanium dioxide is obtained, and the finally prepared material not only has excellent adsorption performance, but also has excellent photocatalytic performance. The preparation process is environmentally friendly and safe, and the operation is simple and suitable for large-scale production, and has good application prospect in the fields of wastewater treatment and waste gas treatment.

[0090] The above shows and describes the basic principles, main features and advantages of the present application. Those skilled in the art should understand that the above examples do not limit the present application in any form, and any technical solutions obtained by equivalent replacement or equivalent transformation fall within the protection scope of the present application.

Claims

1. A method for preparing a bifunctional titanium-based material, characterized in that, Includes the following steps: S1. Preparation of Ti3C2-MXene nanosheets: Lithium fluoride was added to hydrochloric acid and stirred to disperse it. Ti3AlC2 powder was then slowly added to the solution. After reacting for a period of time, the acidic solution was washed with deionized water until the pH of the washing solution was neutral. Subsequently, the solution was centrifuged to obtain a Ti3C2-MXene colloidal solution. S2. Preparation of bifunctional titanium-based materials: The Ti3C2-MXene colloidal solution obtained in step S1 was placed in a culture bottle, and then hydrogen peroxide solution was added to it. Under ultraviolet light radiation, the mixture was reacted at 20~40℃ for 4~6 hours, and then freeze-dried to obtain a bifunctional titanium-based material. The material is a heterojunction structure composed of amorphous titanium peroxide and anatase titanium dioxide.

2. The method for preparing a bifunctional titanium-based material according to claim 1, characterized in that, In step S1, the reaction is carried out at 35~55℃ for 12~24 h.

3. The method for preparing a bifunctional titanium-based material according to claim 1, characterized in that, In step S2, the mass percentage concentration of the hydrogen peroxide solution is 3%.

4. The method for preparing a bifunctional titanium-based material according to claim 1, characterized in that, In step S2, the ultraviolet lamp radiation level is 2 to 5.

5. The method for preparing a bifunctional titanium-based material according to claim 1, characterized in that, Includes the following steps: S1. Preparation of Ti3C2-MXene nanosheets: Add 1-2 g of lithium fluoride to 15-20 mL of 9 M hydrochloric acid and stir to disperse; then slowly add 1-2 g of Ti3AlC2 powder to the solution and react at 35-55 °C for 12-24 h. Wash the acidic solution after the reaction with deionized water until the pH is neutral; then centrifuge at 500-5000 rpm for 1-2 h to obtain Ti3C2-MXene colloidal solution. S2. Preparation of bifunctional titanium-based materials: The Ti3C2-MXene colloidal solution obtained in step S1 was placed in a culture bottle, and 5-20 mL of 3% hydrogen peroxide solution was added. Under the radiation of a level 4 ultraviolet lamp, the solution was allowed to react fully at 20-40°C for 4-6 hours, and then freeze-dried to obtain the bifunctional titanium-based material.

6. A bifunctional titanium-based material, characterized in that, It is prepared by the preparation method according to any one of claims 1 to 5.

7. A bifunctional titanium-based material according to claim 6, characterized in that, This material was prepared on the surface of Ti3C2-MXene in a thin film by a one-step oxidation method. It has a microscopic three-dimensional porous structure and can degrade RhB by more than 80% within 20 minutes and more than 90% within two hours.

8. A bifunctional titanium-based material according to claim 6, characterized in that, The material is a heterojunction structure composed of amorphous titanium peroxide and anatase titanium dioxide.

9. The application of the bifunctional titanium-based material according to claim 6 in the treatment of organic pollutants in wastewater.

10. The application of the bifunctional titanium-based material according to claim 6 in the degradation of rhodamine.

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