Topological indium hydroxide nanosheet photocatalyst, preparation method and application thereof

Abstract

The application relates to a preparation method of a topological transformation indium hydroxide nanosheet photocatalyst. Indium sulfide is prepared through a hydrothermal method; the indium sulfide is added into ultrapure water, sodium hydroxide is further added, the solution is fully stirred, and a hydrothermal reaction is performed on the solution to obtain orange precipitates; the obtained orange precipitates are washed and vacuum dried to obtain the topological transformation indium hydroxide nanosheet photocatalyst. The topological transformation indium hydroxide nanosheet photocatalyst is applied to degradation of antibiotics under visible light. The method has the beneficial effects that: the indium hydroxide is synthesized through topological transformation of indium sulfide, has stronger visible light absorption capacity, can accelerate separation and migration of photo-generated electron-hole pairs while providing more reaction active sites, makes the catalyst exhibit good catalytic performance, degrades tetracycline under visible light, and the degradation rate is obviously better than that of the indium sulfide, and the method has great development potential in the field of environmental remediation, and the preparation method is simple, the conditions are easy to control, and the method is green and environment-friendly.

Description

Technical Field

[0001] This invention relates to the field of photocatalysis technology, specifically to a topological conversion indium hydroxide nanosheet photocatalyst, its preparation method, and its application. Background Technology

[0002] Tetracycline is a typical broad-spectrum antibiotic that inhibits most Gram-positive and Gram-negative bacteria and has bactericidal effects at high concentrations. However, it is also a persistent organic pollutant with immunotoxicity, neurotoxicity, and cytotoxicity. Excessive emissions of antibiotics seriously harm the ecological environment and human health. Photocatalysis, driven by solar energy, is considered one of the effective strategies for efficiently removing various environmental pollutants. However, most of the photocatalysts reported so far are only suitable for the high-activity removal of single pollutants under specific conditions, which seriously limits its development and makes it difficult to meet the increasingly complex and multifunctional environmental purification needs. Therefore, designing inexpensive, efficient, and stable broad-spectrum photocatalysts is of great significance for expanding the application of photocatalysis. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a topological conversion indium hydroxide nanosheet photocatalyst, its preparation method and application, so as to overcome the shortcomings of the prior art.

[0004] The technical solution of this invention to solve the above-mentioned technical problems is as follows: A method for preparing a topological conversion indium hydroxide nanosheet photocatalyst, comprising the following steps:

[0005] S100, Indium sulfide is prepared by hydrothermal method;

[0006] S200. Indium sulfide is added to ultrapure water, followed by sodium hydroxide. The mixture is stirred thoroughly and subjected to a hydrothermal reaction to obtain an orange precipitate.

[0007] The orange precipitate obtained by S300 and S200 was washed and dried under vacuum to obtain a topological conversion indium hydroxide nanosheet photocatalyst.

[0008] Based on the above technical solution, the present invention can be further improved as follows.

[0009] Furthermore, the amount of sodium hydroxide added in S200 is 1g to 4g, the temperature of the hydrothermal reaction is 120℃ to 150℃, and the time is 60min to 180min.

[0010] Furthermore, S100 specifically refers to:

[0011] S110. Disperse indium trichloride and thioacetamide in ultrapure water and stir until completely dissolved;

[0012] S120, the solution obtained from S110 is subjected to a hydrothermal reaction to obtain an orange precipitate;

[0013] S130: The orange precipitate obtained in S120 is washed and dried under vacuum to obtain indium sulfide.

[0014] Furthermore, S110 is specifically prepared as follows: Take 0.885g of indium trichloride and 0.451g of thioacetamide, disperse them in 60mL of ultrapure water, and stir thoroughly until completely dissolved.

[0015] Furthermore, the hydrothermal reaction in S120 is carried out at a temperature of 95°C for 90 minutes.

[0016] Based on the above technical solution, the present invention also provides a topological conversion indium hydroxide nanosheet photocatalyst, which is prepared by the above preparation method.

[0017] Based on the above technical solution, the present invention also provides an application of topological conversion indium hydroxide nanosheet photocatalyst in the degradation of antibiotics under visible light.

[0018] Furthermore, the antibiotic is tetracycline.

[0019] The beneficial effects of this invention are as follows: During the hydrothermal reaction, hydroxide ions in the solution undergo ion exchange with sulfur ions, forming indium hydroxide nanoparticles with good crystal structure under high temperature and high pressure conditions. In this invention, a typical metal hydroxide, indium hydroxide, is selected because its exposed InO bonds act as active sites and can also regulate the reaction state through adsorption of hydroxyl groups on the surface. Moreover, indium hydroxide has a typical two-dimensional sheet structure, which can provide a large specific surface area and surface active sites. Therefore, the synthesis of indium hydroxide by topological transformation of indium sulfide has stronger visible light absorption capacity, accelerates the separation and migration of photogenerated electron-hole pairs, and can provide more reactive active sites, making the catalyst exhibit good catalytic performance. In the visible light degradation of tetracycline (TC), the degradation rate is significantly better than that of indium sulfide, showing great development potential in the field of environmental remediation. This preparation method is simple, the conditions are easy to control, and it is green and environmentally friendly. Attached Figure Description

[0020] Figure 1 Here is a high-angle annular dark-field transmission electron microscope image of the topological conversion indium hydroxide nanosheet photocatalyst prepared in Example 3;

[0021] Figure 2 The X-ray diffraction patterns of the topological conversion indium hydroxide nanosheet photocatalyst prepared in Example 3 and indium sulfide are shown. Detailed Implementation

[0022] The principles and features of the present invention are described below with reference to the accompanying drawings. The examples given are only for explaining the present invention and are not intended to limit the scope of the present invention.

[0023] Example 1

[0024] A method for preparing a topological conversion indium hydroxide nanosheet photocatalyst includes the following steps:

[0025] S100: Disperse 0.885g of indium trichloride and 0.451g of thioacetamide in 60mL of ultrapure water and stir thoroughly until completely dissolved;

[0026] S200: The solution obtained in S100 was subjected to a hydrothermal reaction at 95℃ for 90 min to obtain an orange precipitate;

[0027] S300: The orange precipitate obtained in S200 is washed and then dried in a vacuum drying oven to obtain orange powder;

[0028] S400: Add orange powder to 50mL of ultrapure water, then add 1g of sodium hydroxide, stir thoroughly, and carry out hydrothermal reaction at 120℃ for 60min to obtain orange precipitate;

[0029] The orange precipitate obtained by S500 and S400 was washed and then dried in a vacuum drying oven to obtain a topological conversion indium hydroxide nanosheet photocatalyst.

[0030] Laboratory simulation: A 300W xenon lamp was used to simulate sunlight, and a 420nm cutoff filter was installed to obtain visible light. Tetracycline (40mg / L) was used as the target pollutant. 50mg of topological conversion indium hydroxide nanosheet photocatalyst was added to 100mL of tetracycline. Under simulated visible light (near-infrared light) irradiation, the photodegradation reaction was carried out for 60min. The degradation rate of tetracycline by the topological conversion indium hydroxide nanosheet photocatalyst obtained in Example 1 was 79%.

[0031] Example 2

[0032] A method for preparing a topological conversion indium hydroxide nanosheet photocatalyst includes the following steps:

[0033] S100: Disperse 0.885g of indium trichloride and 0.451g of thioacetamide in 60mL of ultrapure water and stir thoroughly until completely dissolved;

[0034] S200: The solution obtained in S100 was subjected to a hydrothermal reaction at 95℃ for 90 min to obtain an orange precipitate;

[0035] S300: The orange precipitate obtained in S200 is washed and then dried in a vacuum drying oven to obtain orange powder;

[0036] S400: Add orange powder to 50mL of ultrapure water, then add 2g of sodium hydroxide, stir thoroughly, and carry out hydrothermal reaction at 120℃ for 120min to obtain orange precipitate;

[0037] The orange precipitate obtained by S500 and S400 was washed and then dried in a vacuum drying oven to obtain a topological conversion indium hydroxide nanosheet photocatalyst.

[0038] Laboratory simulation: A 300W xenon lamp was used to simulate sunlight, and a 420nm cutoff filter was installed to obtain visible light. Tetracycline (40mg / L) was used as the target pollutant. 50mg of topological conversion indium hydroxide nanosheet photocatalyst was added to 100mL of tetracycline. Under simulated visible light (near-infrared light) irradiation, the photodegradation reaction was carried out for 60min. The degradation rate of tetracycline by the topological conversion indium hydroxide nanosheet photocatalyst obtained in Example 2 was 91%.

[0039] Example 3

[0040] A method for preparing a topological conversion indium hydroxide nanosheet photocatalyst includes the following steps:

[0041] S100: Disperse 0.885g of indium trichloride and 0.451g of thioacetamide in 60mL of ultrapure water and stir thoroughly until completely dissolved;

[0042] S200: The solution obtained in S100 was subjected to a hydrothermal reaction at 95℃ for 90 min to obtain an orange precipitate;

[0043] S300: The orange precipitate obtained in S200 is washed and then dried in a vacuum drying oven to obtain orange powder;

[0044] S400: Add orange powder to 50mL of ultrapure water, then add 4g of sodium hydroxide, stir thoroughly, and carry out hydrothermal reaction at 150℃ for 180min to obtain orange precipitate;

[0045] The orange precipitate obtained by S500 and S400 was washed and then dried in a vacuum drying oven to obtain a topological conversion indium hydroxide nanosheet photocatalyst.

[0046] Laboratory simulation: A 300W xenon lamp was used to simulate sunlight, and a 420nm cutoff filter was installed to obtain visible light. Tetracycline (40mg / L) was used as the target pollutant. 50mg of topological conversion indium hydroxide nanosheet photocatalyst was added to 100mL of tetracycline. Under simulated visible light (near-infrared light) irradiation, the photodegradation reaction was carried out for 60min. The degradation rate of tetracycline by the topological conversion indium hydroxide nanosheet photocatalyst obtained in Example 3 was 93%.

[0047] Figure 1 This is a high-angle annular dark-field transmission electron microscope image of the topological conversion indium hydroxide nanosheet photocatalyst prepared in Example 3. Figure 1 The topologically synthesized indium hydroxide exhibits a typical layered structure.

[0048] Figure 2 The image shows the X-ray diffraction patterns of the topological conversion indium hydroxide nanosheet photocatalyst prepared in Example 3 and indium sulfide. As can be seen from the image, the X-ray diffraction peaks correspond to pure phase indium hydroxide.

[0049] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A method for preparing a topological conversion indium hydroxide nanosheet photocatalyst, characterized in that, Includes the following steps: S100. Disperse indium trichloride and thioacetamide in ultrapure water and stir until completely dissolved. Then, subject the resulting solution to a hydrothermal reaction at a temperature of 95°C for 90 minutes to obtain an orange precipitate. Wash the orange precipitate and vacuum dry it to obtain indium sulfide. S200. Indium sulfide is added to ultrapure water, followed by sodium hydroxide. The mixture is stirred thoroughly and subjected to a hydrothermal reaction at a temperature of 120℃~150℃ for 60min~180min to obtain an orange precipitate. The orange precipitate obtained by S300 and S200 was washed and dried under vacuum to obtain a topological conversion indium hydroxide nanosheet photocatalyst.

2. The preparation method according to claim 1, characterized in that, The dosage of sodium hydroxide in S200 is 1g to 4g.

3. The preparation method according to claim 1 or 2, characterized in that, Disperse 0.885g of indium trichloride and 0.451g of thioacetamide in 60mL of ultrapure water and stir thoroughly until completely dissolved.

4. A topological transformation indium hydroxide nanosheet photocatalyst, characterized in that: It is prepared by the preparation method according to any one of claims 1 to 3.

5. The application of the topological transformation indium hydroxide nanosheet photocatalyst as described in claim 4 in the degradation of antibiotics under visible light.

6. The application according to claim 5, characterized in that: The antibiotic in question is tetracycline.

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