An acid-modified M2Ti6O 13 / TiO2 nanobelt and a preparation method thereof

Abstract

The application relates to the technical field of photocatalysts, in particular to an acid-modified M2Ti6O 13 / TiO2 nanobelt and a preparation method thereof, the method comprising the following steps: uniformly mixing anatase titanium dioxide, hydrogen peroxide and an alkaline solution to obtain a first mixed solution; after the first mixed solution is subjected to a hydrothermal reaction, a solid product is separated out; the solid product is washed to be neutral, and after drying treatment, calcination treatment is carried out in an inert gas atmosphere to obtain an HT-TiO2 sample; the HT-TiO2 sample is added into an acid solution containing a reducing organic acid to obtain a second mixed solution; after the second mixed solution is stirred and reacted at a preset temperature, the reaction product is washed and subjected to vacuum drying treatment to obtain an acid-modified M2Ti6O 13 / TiO2 nanobelt. The nanobelt prepared by the application has better carbon dioxide photocatalytic reduction effect and selectivity for products.

Description

Technical Field

[0001] This invention relates to the field of photocatalyst technology, and more specifically, to an acid-modified M2Ti6O 13 / TiO2 nanoribbons and their preparation methods. Background Technology

[0002] Photocatalytic reduction of carbon dioxide (CO2) is an environmentally friendly technology that mimics plant photosynthesis and utilizes sunlight to recycle carbon dioxide. It is also an ideal approach for future atmospheric environmental control and clean energy utilization. However, CO2 photocatalytic reduction suffers from low yields and poor selectivity. Developing efficient photocatalysts is crucial for the engineering application of this technology. Titanium dioxide (TiO2) is one of the most promising photocatalysts due to its low cost, high chemical stability, and ease of preparation. However, its poor visible light response, low charge separation efficiency, and poor product selectivity limit its application in the field of photocatalytic CO2 reduction.

[0003] Extensive research has been conducted on TiO2 modification methods and photocatalytic performance. Currently, mainstream strategies for TiO2 modification mainly include crystal and crystal plane engineering modification, metal or non-metal doping, and the construction of semiconductor heterojunctions. Among these, TiO2 nanoribbons, as one-dimensional nanomaterials, possess abundant exposed active crystal planes and excellent mechanical and photoelectrochemical properties, making them promising photocatalytic materials. However, the photocatalytic effect of TiO2 nanoribbons on carbon dioxide needs further improvement. Moreover, when existing TiO2 nanoribbons are used for carbon dioxide photocatalytic reactions, the products are mostly shallowly reduced, with fewer deeply reduced products, indicating poor selectivity for carbon dioxide photocatalytic products. Summary of the Invention

[0004] The technical problem solved by the present invention is at least one of the following problems: (1) The photocatalytic reduction effect of existing TiO2 nanoribbons on carbon dioxide needs to be further improved. When existing TiO2 nanoribbons are used for carbon dioxide photocatalytic reaction, the products of carbon dioxide photocatalysis are mostly shallow reduction products, with fewer deep reduction products, and the selectivity for carbon dioxide photocatalytic products is poor.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows:

[0006] An acid-modified M2Ti6O 13 Methods for preparing TiO2 nanoribbons include:

[0007] Step S1: Mix anatase titanium dioxide, hydrogen peroxide, and alkaline solution evenly to obtain the first mixture;

[0008] Step S2: After the first mixture undergoes a hydrothermal reaction, a solid product is separated.

[0009] Step S3: Wash the solid product until it is neutral, dry it, and then calcine it in an inert gas atmosphere to obtain the HT-TiO2 sample.

[0010] Step S4: Add the HT-TiO2 sample to an acidic solution containing reducing organic acid to obtain a second mixture;

[0011] Step S5: After the second mixture is stirred and reacted at a preset temperature, the reaction product is washed and vacuum dried to obtain acid-modified M2Ti6O. 13 / TiO2 nanoribbons.

[0012] Preferably, in step S4, the reducing organic acid includes one of ascorbic acid and oxalic acid.

[0013] Preferably, in step S4, the reducing organic acid is ascorbic acid, and the mass ratio of the ascorbic acid to the HT-TiO2 sample in the second mixture is 0.01-0.5.

[0014] Preferably, the mass ratio of ascorbic acid to the HT-TiO2 sample in the second mixture is 0.05.

[0015] Preferably, in step S4, the acidic solution contains a surfactant, acetic acid, and the reducing organic acid; the surfactant includes one of polyvinylpyrrolidone, hexadecyltrimethylammonium bromide, and P123.

[0016] Preferably, in step S1, the alkaline solution includes one of NaOH solution, LiOH solution, and ammonia solution.

[0017] Preferably, in step S2, the hydrothermal reaction is carried out at a temperature of 160-200°C for 16-24 hours.

[0018] Preferably, in step S3, the calcination treatment is carried out at a temperature of 300-450°C for 1.5-2.5 hours.

[0019] Preferably, in step S5, the preset temperature is 50-70℃, and the stirring reaction time is 2-4 hours.

[0020] This invention also provides an acid-modified M2Ti6O 13 / TiO2 nanoribbons, using the acid-modified M2Ti6O as described above 13 / TiO2 nanoribbons were prepared by a specific method.

[0021] Compared with the prior art, in this invention, firstly, M2Ti6O is synthesized via a hydrothermal reaction. 13 Hydrogen peroxide is added during the process of making TiO2 nanoribbons. Under alkaline heating conditions, hydrogen peroxide undergoes a nucleophilic reaction, breaking bonds to form HOO, which can effectively destroy Ti-O-Ti bonds to form hydrated titanium dioxide (Ti-O-OH). Ti-O-OH has poor stability and readily corrodes and dissolves the TiO2 raw material while simultaneously forming oxygen vacancies, which helps to improve M2Ti6O 13 The photocatalytic effect of carbon dioxide on TiO2 nanoribbons leads to the final preparation of acid-modified M2Ti6O 13 / TiO2 nanoribbons exhibit better photocatalytic performance for carbon dioxide. Subsequently, the synthesized M2Ti6O 13 / TiO2 nanoribbons were calcined to prevent further transformation of titanium dioxide into the rutile phase. Finally, reducing organic acids were used to treat the calcined M2Ti6O 13 / TiO2 nanoribbons were modified to obtain acid-modified M2Ti6O 13 / TiO2 nanoribbons, acid-modified M2Ti6O 13 The enhanced visible light responsiveness of TiO2 nanoribbons allows for the generation of more photoelectrons during the carbon dioxide photocatalytic reaction, thereby increasing the yield of the carbon dioxide photocatalytic reaction. Furthermore, in this application, an appropriate amount of reducing organic acid is used to react with calcined M2Ti6O2. 13 When TiO2 nanoribbons are modified, the O in the reducing organic acid combines with the Ti in TiO2 to form defect angles, thereby creating new active sites and promoting C-C coupling. This results in the generation of more deeply reduced products (C2-type products, such as C2H4 and C2H6) during the carbon dioxide photocatalytic reaction. Using an excess of reducing organic acid on calcined M2Ti6O 13 When modifying TiO2 nanoribbons, excessive reducing organic acids can cover the active sites, resulting in the formation of mainly mildly reduced products (C1-type products, such as CO and CH4) during the carbon dioxide photocatalytic reaction. Therefore, by adjusting the amount of reducing organic acid added, the resulting acid-modified M2Ti6O2 nanoribbons can be modified. 13 / TiO2 nanoribbons exhibit selectivity for the products of CO2 photocatalytic reaction. Attached Figure Description

[0022] Figure 1 In this embodiment of the invention, M2Ti6O is acid-modified. 13 A schematic diagram of the preparation method of / TiO2 nanoribbons;

[0023] Figure 2The samples are anatase titanium dioxide, HT-TiO2 prepared in Example 1, and acid-modified K2Ti6O prepared in Example 1. 13 / TiO2 nanoribbons and acid-modified K2Ti6O prepared in Example 2 13 / XRD pattern of TiO2 nanoribbons;

[0024] Figure 3 The HT-TiO2 sample prepared in Example 1 and the acid-modified K2Ti6O2 sample prepared in Example 1 are examples of samples prepared in Example 1. 13 / TiO2 nanoribbons and acid-modified K2Ti6O prepared in Example 2 13 / SEM image of TiO2 nanoribbons;

[0025] Figure 4 The anatase titanium dioxide from Example 1, the HT-TiO2 sample prepared in Example 1, and the acid-modified K2Ti6O prepared in Example 1 were used. 13 / TiO2 nanoribbons and acid-modified K2Ti6O prepared in Example 2 13 The bar chart shows the yields of the photocatalytic reaction products CH4, CO, C2H4, and C2H6 when TiO2 nanoribbons are used for carbon dioxide photocatalysis. Detailed Implementation

[0026] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0027] It should be noted that, unless otherwise specified, the features in the embodiments of this invention can be combined with each other. The terms "comprising," "including," "containing," and "having" are non-limiting, meaning that other steps and other components that do not affect the results can be added. The above terms cover the terms "composed of" and "substantially composed of." Unless otherwise specified, the materials, equipment, and reagents are commercially available.

[0028] Additionally, it should be noted that in this invention, M2Ti6O 13 In / TiO2, M represents K, Li, or NH4, etc. In this invention, deeply reduced products refer to C2 type products, such as C2H4 and C2H6, while lightly reduced products refer to C1 type products, such as CO and CH4.

[0029] like Figure 1 As shown, this embodiment of the invention provides an acid-modified M2Ti6O 13 Methods for preparing TiO2 nanoribbons include:

[0030] Step S1: Mix anatase titanium dioxide, hydrogen peroxide, and alkaline solution evenly to obtain the first mixture;

[0031] Step S2: After the first mixture undergoes a hydrothermal reaction, a solid product is separated.

[0032] Step S3: Wash the solid product until it is neutral, dry it, and then calcine it in an inert gas atmosphere to obtain the HT-TiO2 sample.

[0033] Step S4: Add the HT-TiO2 sample to an acidic solution containing reducing organic acid to obtain a second mixture;

[0034] Step S5: After the second mixture is stirred and reacted at a preset temperature, the reaction product is washed and vacuum dried to obtain acid-modified M2Ti6O. 13 / TiO2 nanoribbons.

[0035] Compared with the prior art, in this invention, firstly, M2Ti6O is synthesized via a hydrothermal reaction. 13 Hydrogen peroxide is added during the process of making TiO2 nanoribbons. Under alkaline heating conditions, hydrogen peroxide undergoes a nucleophilic reaction, breaking bonds to form HOO, which can effectively destroy Ti-O-Ti bonds to form hydrated titanium dioxide (Ti-O-OH). Ti-O-OH has poor stability and readily corrodes and dissolves the TiO2 raw material while simultaneously forming oxygen vacancies, which helps to improve M2Ti6O 13 The photocatalytic effect of carbon dioxide on TiO2 nanoribbons leads to the final preparation of acid-modified M2Ti6O 13 / TiO2 nanoribbons exhibit better photocatalytic performance for carbon dioxide. Subsequently, the synthesized M2Ti6O 13 / TiO2 nanoribbons were calcined to prevent further transformation of titanium dioxide into the rutile phase. Finally, reducing organic acids were used to treat the calcined M2Ti6O 13 / TiO2 nanoribbons were modified to obtain acid-modified M2Ti6O 13 / TiO2 nanoribbons, acid-modified M2Ti6O 13 The enhanced visible light responsiveness of TiO2 nanoribbons allows for the generation of more photoelectrons during the carbon dioxide photocatalytic reaction, thereby increasing the yield of the carbon dioxide photocatalytic reaction. Furthermore, in this application, an appropriate amount of reducing organic acid is used to react with calcined M2Ti6O2. 13 When TiO2 nanoribbons are modified, the O in the reducing organic acid combines with the Ti in TiO2 to form defect angles, thereby creating new active sites and promoting C-C coupling. This results in the generation of more deeply reduced products (C2-type products, such as C2H4 and C2H6) during the carbon dioxide photocatalytic reaction. Using an excess of reducing organic acid on calcined M2Ti6O 13When modifying TiO2 nanoribbons, excessive reducing organic acids can cover the active sites, resulting in the formation of mainly mildly reduced products (C1-type products, such as CO and CH4) during the carbon dioxide photocatalytic reaction. Therefore, by adjusting the amount of reducing organic acid added, the resulting acid-modified M2Ti6O2 nanoribbons can be modified. 13 / TiO2 nanoribbons exhibit selectivity for the products of CO2 photocatalytic reaction.

[0036] In some embodiments of the present invention, in step S4, the reducing organic acid includes one of ascorbic acid and oxalic acid.

[0037] In some embodiments of the present invention, in step S4, the reducing organic acid is ascorbic acid, and the mass ratio M of the ascorbic acid to the HT-TiO2 sample in the second mixture is 0.01-0.5. Experiments have shown that when M is less than or equal to 0.05, as M gradually increases, the modified M2Ti6O2 with the prepared acid... 13 When TiO2 nanoribbons are used for photocatalytic carbon dioxide reactions, the deep reduction products gradually increase. When M is 0.05-0.5, the acid-modified M2Ti6O3 produced increases with increasing M. 13 When TiO2 nanoribbons undergo photocatalytic carbon dioxide reaction, the deep reduction products gradually decrease, and the main reduction product is CO.

[0038] In some embodiments of the present invention, the mass ratio M of the ascorbic acid to the HT-TiO2 sample in the second mixture is 0.05. When M is 0.05, the prepared acid is used to modify M2Ti6O. 13 When TiO2 nanoribbons undergo photocatalytic carbon dioxide reaction, the amount of deep reduction products is the highest.

[0039] In some embodiments of the present invention, in step S4, the acidic solution contains a surfactant, acetic acid, and the reducing organic acid; the surfactant includes one of polyvinylpyrrolidone, hexadecyltrimethylammonium bromide, and P123. The surfactant is mainly used to disperse the HT-TiO2 sample to form a stable nano-suspension.

[0040] In some embodiments of the present invention, in step S1, the alkaline solution includes one of NaOH solution, LiOH solution, and ammonia solution.

[0041] In some embodiments of the present invention, in step S2, the temperature of the hydrothermal reaction is 160-200°C and the time is 16-24 hours.

[0042] In some embodiments of the present invention, in step S3, the calcination treatment temperature is 300-450°C and the time is 1.5-2.5h.

[0043] In some embodiments of the present invention, in step S5, the preset temperature is 50-70°C, and the stirring reaction time is 2-4 hours.

[0044] This invention also provides an acid-modified M2Ti6O 13 / TiO2 nanoribbons, using the acid-modified M2Ti6O as described above 13 / TiO2 nanoribbons were prepared by a specific method.

[0045] The present invention will be further illustrated below with reference to specific embodiments. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the invention. The anatase titanium dioxide used in the embodiments of the present invention is commercially available anatase titanium dioxide.

[0046] Example 1

[0047] 1.1 Add 1.5g of anatase titanium dioxide to 60ml of a solution containing hydrogen peroxide and KOH and mix thoroughly to obtain the first mixture; wherein, the concentration of KOH in the first mixture is 10mol / L and the concentration of hydrogen peroxide is 350mmol / L.

[0048] 1.2 After the first mixture is transferred to the reactor for hydrothermal reaction, the solid product is separated; wherein, the hydrothermal reaction temperature is 180℃ and the time is 20h.

[0049] 1.3 After cooling, the solid product is washed with 0.1 mol / L glacial acetic acid solution until neutral, and then dried to obtain the sample K2Ti6O. 13 / TiO2 nanoribbon sample.

[0050] 1.4. K2Ti6O 13 The TiO2 nanoribbon sample was calcined under a nitrogen atmosphere to obtain the HT-TiO2 sample; the calcination temperature was 450℃ and the time was 2h.

[0051] 1.5. Take 0.4g of HT-TiO2 sample and add it to the acidic solution to obtain the second mixture. The acidic solution consists of 0.3g of polyvinylpyrrolidone, 50ml of glacial acetic acid and 0.02g of ascorbic acid. It can be seen that the mass ratio of ascorbic acid to HT-TiO2 in the second mixture is 0.05.

[0052] 1.6 After the second mixture was stirred and reacted at 60°C for 3 hours, the reaction product was washed with anhydrous ethanol and water by centrifugation until neutral, and then vacuum dried at 60°C to obtain acid-repaired K2Ti6O. 13 / TiO2 nanoribbons.

[0053] Example 2

[0054] The difference from Example 1 is that in step 1.5, the mass of ascorbic acid in the acidic solution is 0.12g, that is, the mass ratio of ascorbic acid to HT-TiO2 in the second mixture is 0.3.

[0055] Example 3

[0056] 3.1 Add 1.5g of anatase titanium dioxide to 60ml of a solution containing hydrogen peroxide and KOH and mix thoroughly to obtain the first mixture; wherein, the concentration of KOH in the first mixture is 8mol / L and the concentration of hydrogen peroxide is 150mmol / L.

[0057] 3.2 After the first mixture is transferred to the reactor for hydrothermal reaction, the solid product is separated; wherein, the hydrothermal reaction temperature is 180℃ and the time is 16h.

[0058] 3.3 After cooling, the solid product is washed with 0.1 mol / L glacial acetic acid solution until neutral, and then dried to obtain the sample K2Ti6O. 13 / TiO2 nanoribbon sample.

[0059] 3.4. K2Ti6O 13 The TiO2 nanoribbon sample was calcined under a nitrogen atmosphere to obtain the HT-TiO2 sample; the calcination temperature was 350℃ and the time was 2h.

[0060] 3.5. Take 0.4g of HT-TiO2 sample and add it to the acidic solution to obtain the second mixture. The acidic solution consists of 0.3g of polyvinylpyrrolidone, 50ml of glacial acetic acid and 0.02g of ascorbic acid. It can be seen that the mass ratio of ascorbic acid to HT-TiO2 in the second mixture is 0.05.

[0061] 3.6 After the second mixture was stirred and reacted at 60°C for 3 hours, the reaction product was washed with anhydrous ethanol and water by centrifugation until neutral, and then vacuum dried at 60°C to obtain acid-repaired K2Ti6O. 13 / TiO2 nanoribbons.

[0062] Experimental Example

[0063] For anatase titanium dioxide, the HT-TiO2 sample prepared in Example 1, and the acid-modified K2Ti6O prepared in Example 1... 13 / TiO2 nanoribbons and acid-modified K2Ti6O prepared in Example 2 13 XRD characterization of the / TiO2 nanoribbons was performed, and the results are as follows: Figure 2 As shown, from Figure 2 It can be seen that HT-TiO2 is mainly composed of anatase, with small amounts of potassium titanate and rutile, indicating that the ascorbic acid modification process does not affect the crystal form. It should be noted that... Figure 2 In this context, A represents anatase, R represents rutile, and K represents potassium titanate.

[0064] The HT-TiO2 sample prepared in Example 1 and the acid-modified K2Ti6O2 sample prepared in Example 1 were compared. 13 / TiO2 nanoribbons and acid-modified K2Ti6O prepared in Example 2 13 / TiO2 nanoribbons were characterized by SEM, and the results are as follows: Figure 3 As shown, Figure 3 Image (a) is a SEM image of the HT-TiO2 sample prepared in Example 1. Figure 3 (b) shows the acid-modified K2Ti6O prepared in Example 1. 13 SEM images of TiO2 nanoribbons and Figure 3 (c) Acid-modified K2Ti6O prepared in Example 2 13 SEM image of TiO2 nanoribbons. From Figure 3 It can be seen that with the increase of ascorbic acid content in the second mixture, the acid-modified K2Ti6O 13 / TiO2 nanoribbons become thinner.

[0065] The following were used: anatase titanium dioxide, the HT-TiO2 sample prepared in Example 1, and the acid-modified K2Ti6O prepared in Example 1. 13 / TiO2 nanoribbons and acid-modified K2Ti6O prepared in Example 2 13 / TiO2 nanoribbons were used for photocatalytic reactions of carbon dioxide, and the yields of CH4, CO, C2H4 and C2H6 during the reaction were as follows: Figure 4 As shown, from Figure 4 It can be seen that, compared with the HT-TiO2 sample, the acid-modified K2Ti6O prepared in Example 1... 13 / TiO2 nanoribbons and acid-modified K2Ti6O prepared in Example 2 13 / TiO2 nanoribbons improved the overall yield of the reduction products. The acid-modified K2Ti6O prepared in Example 1 13 / TiO2 nanoribbons and acid-modified K2Ti6O prepared in Example 213 Compared to TiO2 nanoribbons, the acid-modified K2Ti6O prepared in Example 1... 13 The photocatalytic reaction of carbon dioxide involving TiO2 nanoribbons yields a relatively large number of deep reduction products, including CH4, CO, C2H4, and C2H6. The acid-modified K2Ti6O prepared in Example 2... 13 The reduction products of the carbon dioxide photocatalytic reaction involving TiO2 nanoribbons are mainly shallow reduction products, and no deep reduction products are observed.

[0066] It should be noted that, Figure 2 In the diagram, the curve below TiO2 is the XRD pattern of argyroclasm titanium dioxide, the curve below HT-TiO2 is the XRD pattern of the HT-TiO2 sample prepared in Example 1, and the curve below AA0.05 is the XRD pattern of the acid-modified K2Ti6O2 sample prepared in Example 1. 13 XRD pattern of TiO2 nanoribbons, curve below AA0.3, acid-modified K2Ti6O prepared in Example 2. 13 XRD pattern of TiO2 nanoribbons. Figure 4 In the diagram, the bar chart above TiO2 shows the reduction product yield of argyroclasm titanium dioxide, the bar chart above HT-TiO2 shows the reduction product yield of the HT-TiO2 sample prepared in Example 1, and the bar chart above AA0.05 shows the acid-modified K2Ti6O2 prepared in Example 1. 13 / The bar chart shows the yield of the reduction products of TiO2 nanoribbons. The part above AA0.3 represents the acid-modified K2Ti6O prepared in Example 2. 13 / TiO2 nanoribbon reduction product yield bar chart, No Det represents no data detected.

[0067] Furthermore, it should be noted that although the present invention has been disclosed above, its scope of protection 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 all such changes and modifications will fall within the scope of protection of the present invention.

Claims

1. A method for preparing acid-modified M2Ti60 13 / TiO2 nanobelt, characterized in that, The application relates to a preparation method of a high-temperature anatase TiO2 (HT-TiO2) sample. The application relates to a preparation method of a high-temperature anatase TiO2 (HT-TiO2) sample. The application relates to a preparation method of a high-temperature anatase TiO2 (HT-TiO2) sample. The application relates to a preparation method of a high-temperature anatase TiO2 (HT-TiO2) sample. The application relates to a preparation method of a high-temperature anatase TiO2 (HT-TiO2) sample. Step S5, after the second mixed solution is stirred and reacted at a preset temperature, the reaction product is washed and vacuum dried to obtain acid-modified M2Ti6O 13 / TiO2 nanobelt.

2. The acid-modified M2Ti60x 13 A method for preparing a TiO2nanobelt, characterized in that, The application relates to a preparation method of a high-temperature anatase TiO2 (HT-TiO2) sample.

3. The acid-modified M2Ti60x 13 A method for preparing a / TiO2 nanobelt, characterized in that, The application relates to a preparation method of a high-temperature anatase TiO2 (HT-TiO2) sample.

4. The acid-modified M2Ti60x 13 A method for preparing a / TiO2 nanobelt, characterized in that, The application relates to a preparation method of a high-temperature anatase TiO2 (HT-TiO2) sample.

5. The acid-modified M2Ti6O 13 A method for preparing a TiO2 nanobelt, characterized in that, The application relates to a preparation method of a high-temperature anatase TiO2 (HT-TiO2) sample.

6. The acid-modified M2Ti60x 13 A method for preparing a / TiO2 nanobelt, characterized in that, The application relates to a preparation method of a high-temperature anatase TiO2 (HT-TiO2) sample.

7. The acid-modified M2Ti60x 13 A method for preparing a / TiO2 nanobelt, characterized in that, The application relates to a preparation method of a high-temperature anatase TiO2 (HT-TiO2) sample.

8. The acid-modified M2Ti60x 13 A method for preparing a TiO2nanobelt, characterized in that, The application relates to a preparation method of a high-temperature anatase TiO2 (HT-TiO2) sample.

9. The acid-modified M2Ti60x 13 A method for preparing a / TiO2 nanobelt, characterized in that, The application relates to a preparation method of a high-temperature anatase TiO2 (HT-TiO2) sample. The application relates to a preparation method of a high-temperature anatase TiO2 (HT-TiO2) sample. The application relates to a preparation method of a high-temperature anatase TiO2 (HT-TiO2) sample. The application relates to a preparation method of a high-temperature anatase TiO2 (HT-TiO2) sample. The application relates to a preparation method of a high-temperature anatase TiO2 (HT-TiO2) sample. The application relates to a preparation method of a high-temperature anatase TiO2 (HT-TiO2) sample. The application relates to a preparation method of a high-temperature anatase TiO2 (HT-TiO2) sample. The application relates to a preparation method of a high-temperature anatase TiO2 (HT-TiO2) sample. The application relates to a preparation method of a high-temperature anatase TiO2 (HT-TiO2) sample. The application relates to a preparation method of a high-temperature anatase TiO2 (HT-TiO2) sample. The application relates to a preparation method of a high-temperature anatase TiO2 (HT-TiO2) sample. The application relates to a preparation method of a high-temperature anatase TiO2 (HT-TiO2) sample. The application relates to a preparation method of a high-temperature anatase TiO2 (HT-TiO2) sample. The application relates to a preparation method of a high-temperature anatase TiO2 (HT-TiO2) sample. The application relates to a preparation method of a high-temperature anatase TiO2 (HT-TiO2) sample. The application relates to a preparation method of a high-temperature anatase TiO2 (HT-TiO2) sample. The application relates to a preparation method of a high-temperature anatase TiO2 (HT-TiO2) sample. The application relates to a preparation method of a high-temperature anatase TiO2 (HT-TiO2) sample. The application relates to a preparation method of a high-temperature anatase TiO2 (HT-TiO2) sample. The application relates to a preparation method of a high-temperature anatase TiO2 (HT-TiO2) sample. The application relates to a preparation method of a high-temperature anatase TiO2 (HT-TiO2) sample. The application relates to a preparation method of a high-temperature anatase TiO2 (HT-TiO2) sample. The application relates to a preparation method of a high-temperature anatase TiO2 (HT-TiO2) sample. The application relates to a preparation method of a high-temperature anatase TiO2 (HT-T 10. An acid-modified M2Ti60x 13 / Ti02 nanoribbon characterized in that, An acid-modified M2Ti6O 13 / TiO2 nanobelts are prepared by a method. ​

Images