Embedded face-to-face 2D-In2S3 / 2D-ZnSe composite photocatalytic material, preparation method and application

Abstract

The present invention belongs to the application field of preparation of nano-composite materials and environmental protection, and discloses an embedded face-to-face 2D-In2S3 / 2D-ZnSe composite photocatalytic material, preparation method and application. The method first hydrothermally synthesizes 2D flaky ZnSe, then dissolves the ZnSe nanosheets in a mixed solution of a certain volume of deionized water and ethanol, and finally adopts an in-situ hydrothermal method to obtain the face-to-face 2D-In2S3 / 2D-ZnSe composite photocatalytic material; it can be used for photocatalytic preparation of hydrogen peroxide and photocatalytic degradation of harmful substances in sewage. The preparation method has low raw material cost, simple process and mild reaction conditions. In-situ growth is used to form close contact between 2D-In2S3 and 2D-ZnSe nanosheets, realizing efficient migration and spatial separation of photogenerated carriers, significantly enhancing the electron transmission capacity in the composite material, broadening the spectral absorption range of a single photocatalytic component, thereby improving the photocatalytic activity and stability of the overall material, and having important and broad application prospects in water purification and preparation of high-value-added chemical products.

Description

Technical Field

[0001] The present invention belongs to the field of preparation of nanocomposite materials and application of environmental protection, and relates to an embedded face-to-face 2D-In2S3 / 2D-ZnSe composite photocatalytic material, a preparation method and application. Background Art

[0002] Semiconductor photocatalytic oxidation technology is considered an effective way to address pollution problems due to its advantages such as low energy consumption, simple operation and mild reaction conditions. In addition to environmental remediation, photocatalytic technology can precisely control chemical reactions, so it is also widely used in synthetic chemistry. This technology provides an environmentally friendly path for the synthesis of high-value-added chemicals and lays the foundation for achieving green and sustainable chemical goals. However, since most photocatalysts have low visible light absorption and utilization rates, photogenerated electron-hole pairs quickly recombine within nanoseconds, resulting in a significant decrease in quantum efficiency, the actual effectiveness of photocatalytic technology is seriously affected. Therefore, it is of great significance to develop new photocatalysts with wide-spectrum visible light response capabilities and efficient charge separation characteristics.

[0003] Indium sulfide (In2S3) is a typical III-VI narrow bandgap semiconductor. It has attracted attention in the field of catalysis due to its good visible light response, low toxicity and suitable band structure. In particular, its high chemical potential (CB potential) makes it have excellent reducibility, which is more conducive to photocatalytic reactions. However, due to the poor crystallization performance of In2S3 nanomaterials, its photogenerated electron-hole pair recombination is serious and the photoquantum efficiency is poor. At the same time, the S in In2S3 semiconductor materials is 2- It is easily oxidized under light, causing photocorrosion, which seriously affects the stability of the catalytic material and limits its wide application. Therefore, the development of new In2S3-based composite materials to improve their photocatalytic activity and stability is the current focus of In2S3 material research.

[0004] Zinc selenide (ZnSe) is a very important semiconductor catalytic material belonging to the II-VI group. Its most common stable phase is the cubic zinc blende structure, which is similar to the diamond structure and therefore chemically stable. ZnSe is a direct bandgap semiconductor with a bandgap of approximately 2.7 eV. It absorbs light from the ultraviolet to the blue-green visible range, offering advantages in photocatalytic applications. Furthermore, due to quantum confinement effects, size manipulation can effectively enhance ZnSe's light-harvesting ability and extend carrier lifetime. Summary of the Invention

[0005] Based on the existing technology and combining the advantages of the above two materials, the present invention provides an embedded face-to-face 2D-In2S3 / 2D-ZnSe composite photocatalytic material, preparation method and application. By utilizing the characteristics of ZnSe photostability and its band gap structure suitable for In2S3 nanosheets, efficient migration and spatial separation of photogenerated carriers are achieved, the electron transport capacity in the composite material is significantly enhanced, and the spectral absorption range of a single photocatalytic component is broadened, thereby improving the photocatalytic activity and stability of the In2S3 / ZnSe overall material.

[0006] A method for preparing an embedded face-to-face 2D-In2S3 / 2D-ZnSe composite photocatalytic material, characterized by comprising the following steps:

[0007] (1) Dispersing ZnCl2 and SeO2 in an organic solvent, ultrasonically dispersing for 10-50 minutes, then adding an organic acid and stirring at room temperature for 10-50 minutes; then transferring the mixture to a high-pressure reactor and obtaining flaky ZnSe through a hydrothermal reaction;

[0008] (2) Weigh ZnSe nanosheets and dissolve them in a mixed solution of deionized water and ethanol, and stir them magnetically for 20-40 minutes; then add InCl3·4H2O and thioacetamide (TAA), stir and ultrasonicate for 10-50 minutes; transfer the mixture to a polytetrafluoroethylene-lined stainless steel autoclave for hydrothermal reaction, cool it naturally after the reaction, obtain a precipitate by centrifugation, wash the precipitate with deionized water and ethanol several times, and dry it to obtain an embedded face-to-face 2D In2S3 / 2D ZnSe composite photocatalytic material.

[0009] Furthermore, in step (1), the molar ratio of ZnCl2 and SeO2 is 1:1~2.5, and the amount of organic solvent used is 30~70mL.

[0010] Furthermore, the molar amount of the organic acid in step (1) is 2 to 6 times that of ZnCl2 or SeO2.

[0011] Furthermore, in step (1), the hydrothermal reaction temperature is 160-240° C., and the reaction time is 12-28 h.

[0012] Furthermore, in step (2), the usage ratio of ZnSe, InCl3·4H2O and TAA is: 3~19.6g: 0.29~12g: 0.15~6g; and the ratio of water to ethanol in the mixed solution of water and ethanol is 1:1.

[0013] Furthermore, the hydrothermal reaction temperature in step (2) is 100-260° C., and the reaction time is 16-32 h.

[0014] Furthermore, the organic solvent in step (1) is N,N-dimethylformamide (DMF), N-methylpyrrolidone (NMP) or dimethylacetamide (DMAc).

[0015] Furthermore, the organic acid in step (1) is oxalic acid (H2C2O4), ethylenediaminetetraacetic acid (EDTA) or citric acid (C6H8O7).

[0016] The embedded face-to-face 2D-In2S3 / 2D-ZnSe composite photocatalytic material prepared by the preparation method is characterized in that both ZnSe and In2S3 are 2D lamellar structures, and the In2S3 lamellar structure is embedded in the ZnSe lamellar structure; the mass ratio of In2S3 in the composite photocatalytic material is 5%~25%.

[0017] The application of the embedded face-to-face 2D-In2S3 / 2D-ZnSe composite photocatalytic material is characterized by being used for catalytic preparation of hydrogen peroxide under visible light and photocatalytic degradation of harmful substances in sewage.

[0018] The method for preparing an embedded face-to-face 2D-In2S3 / 2D-ZnSe composite photocatalytic material described herein utilizes an in-situ hydrothermal method to incorporate flaky ZnSe into In2S3 nanosheets, creating an embedded face-to-face 2D-In2S3 / 2D-ZnSe composite structure. The face-to-face interface between the two forms a large number of intimate contacts, providing more channels for photogenerated carrier transmission and increasing the transmission rate of photogenerated electrons. Simultaneously, the matching energy band structures form a heterojunction, which synergistically promotes the effective separation and directional migration of interfacial electrons, effectively enhancing the migration of photogenerated carriers, inhibiting their recombination, and extending the carrier lifetime. This significantly enhances the activity and performance of the composite photocatalytic material. Compared to single materials, the 2D-In2S3 / 2D-ZnSe composite photocatalytic material significantly improves the yield of photocatalytic hydrogen peroxide production and the catalytic degradation of 2-mercaptobenzothiazole, demonstrating its potential for industrial application.

[0019] The preparation method has simple and easily available raw materials, mild and controllable synthesis conditions, and an efficient and rapid reaction process. It shows excellent performance potential in solving water pollution and synthesizing high-value-added chemicals, and has prospects for large-scale application. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is the XRD pattern of the embedded face-to-face 2D-In2S3 / 2D-ZnSe composite photocatalytic material prepared in Example 1.

[0021] Figure 2This is the SEM image of the embedded face-to-face 2D-In2S3 / 2D-ZnSe composite photocatalytic material prepared in Example 2.

[0022] Figure 3 This is the PL image of the embedded face-to-face 2D-In2S3 / 2D ZnSe composite photocatalytic material prepared in Example 3.

[0023] Figure 4 This is the UV-vis graph of the embedded face-to-face 2D-In2S3 / 2D-ZnSe composite photocatalytic material prepared in Example 4.

[0024] Figure 5 This is the XRD pattern of the embedded face-to-face 2D-In2S3 / 2D-ZnSe composite photocatalytic material prepared in Example 5.

[0025] Figure 6 This is the It diagram of the embedded face-to-face 2D-In2S3 / 2D-ZnSe composite photocatalytic material prepared in Example 5. DETAILED DESCRIPTION

[0026] In order to illustrate the technical solution and technical purpose of the present invention, the present invention is further introduced below in conjunction with specific embodiments, but the protection scope of the present invention is not limited thereto.

[0027] First, the photocatalytic performance of the embedded face-to-face 2D-In2S3 / 2D-ZnSe composite photocatalytic material prepared by the present invention was verified by two experiments: photocatalytic preparation of hydrogen peroxide (H2O2) and photocatalytic degradation of 2-thiolbenzothiazole (MBT) in wastewater.

[0028] Photocatalytic H₂O₂ production: The H₂O₂ yield of the embedded face-to-face 2D-In₂S₃ / 2D-ZnSe nanocomposite photocatalyst prepared in this invention was evaluated using a GHX-3 photochemical reactor, using a 250W xenon lamp as the light source to simulate solar light. Ultraviolet light was filtered out using a filter. Specific steps: 15.00 mg of the composite photocatalyst and 50.00 mL of deionized water were weighed and added to the GHX-3 photochemical reactor. The GHX-3 photochemical reactor was placed in an ultrasonic cleaning apparatus and sonicated for 20 minutes until the composite photocatalyst was uniformly dispersed in the solution, forming a suspension free of noticeable particles. During sonication, the reactor was shielded from light to prevent premature exposure to light from affecting catalytic activity. After uniform ultrasonic dispersion, the reaction was irradiated for 120 minutes. Samples were taken every 20 minutes using a microsyringe. After color development, the absorbance at 350 nm was measured on a UV-visible spectrophotometer to calculate the H₂O₂ yield.

[0029] Photocatalytic degradation of 2-mercaptobenzothiazole in sewage: The degradation experiment was carried out in a GHX-3 photochemical reactor, using a 250W xenon lamp as the light source to simulate a solar light source, and using a filter to filter out ultraviolet light to evaluate the degradation efficiency of the embedded surface-to-surface 2D-In2S3 / 2D-ZnSe nanocomposite photocatalyst prepared by the present invention on 2-mercaptobenzothiazole. The specific steps are: 50mL of a target pollutant MBT solution with a concentration of 10mg / L was added to the reactor to determine its initial value, and then 50mg of the composite photocatalytic material was added. After the dark reaction for 20min to reach adsorption-desorption equilibrium, the light was turned on for 60min, and samples were taken every 20min. After centrifugation, the supernatant was taken and the absorbance (λ at the maximum absorption wavelength) was measured in a UV-visible spectrophotometer. MBT =325nm). According to the absorbance before and after illumination, the degradation rate of organic pollutants is calculated as η = (C0 – C t ) / C0×100%, where C0 is the absorbance of the sample at the beginning of illumination, C t is the absorbance of the sample after 120 min of illumination. Example 1

[0030] (1) 2 mmol of ZnCl2 and 2 mmol of SeO2 were dispersed in 30 mL of DMF and ultrasonically dispersed for 10 minutes. 4 mmol of H2C2O4 was then added. The mixture was stirred at room temperature for 10 minutes and then transferred to an autoclave at 160°C for 12 hours to obtain flaky ZnSe through a hydrothermal reaction.

[0031] (2) Weigh 3.0953 g of ZnSe nanosheets and dissolve them in a mixture of 10 mL of deionized water and ethanol. Stir magnetically for 20 minutes. Then add 0.2932 g of InCl3·4H2O and 0.1503 g of TAA, stir and ultrasonicate for 10 minutes. Transfer the mixture to a polytetrafluoroethylene-lined stainless steel autoclave for hydrothermal reaction at 100 °C for 16 h. After the reaction, cool naturally and obtain a precipitate by centrifugation. Wash the precipitate with deionized water and ethanol several times. Dry and collect the sample to obtain an embedded face-to-face 2D-In2S3 / 2D-ZnSe composite photocatalytic material. The content of In2S3 composite photocatalyst is 5%.

[0032] The composite photocatalytic material prepared in this example has a photocatalytic degradation efficiency of 70.24% for 2-thiolbenzothiazole under visible light irradiation for 60 minutes.

[0033] The composite photocatalytic material prepared in this example produced 530.48 mol / L of hydrogen peroxide when irradiated with visible light for 120 min.

[0034] Figure 1The XRD pattern of composite photocatalyst sample 1 prepared according to Example 1 clearly shows that the diffraction peak of the prepared material is sharp and intense, indicating that the sample has good crystallinity. The XRD peak of sample 1 is very similar to that of ZnSe, which may be due to the low content of In2S3. However, a closer look shows that due to the influence of In2S3, the characteristic peak of the (311) crystal plane belonging to ZnSe in the composite material spectrum is slightly offset, indicating that there is an interaction between the two monomer materials, proving that the composite material has been successfully prepared. Example 2

[0035] (1) 3 mmol ZnCl2 and 3.6 mmol SeO2 were dispersed in 40 mL DMF and ultrasonically dispersed for 20 minutes. 9 mmol H2C2O4 was then added. The mixture was stirred at room temperature for 20 minutes and then transferred to an autoclave at 180°C for 16 hours to obtain flaky ZnSe through a hydrothermal reaction.

[0036] (2) Weigh 7.3312 g of ZnSe nanosheets and dissolve them in a mixture of 20 mL of deionized water and ethanol. Magnetic stirring is performed for 25 minutes. 1.4662 g of InCl3·4H2O and 0.7513 g of TAA are then added and stirred ultrasonically for 20 minutes. The mixture is transferred to a polytetrafluoroethylene-lined stainless steel autoclave for hydrothermal reaction at 140 °C for 20 h. After the reaction is completed, the reaction is allowed to cool naturally and a precipitate is obtained by centrifugation. The precipitate is washed with deionized water and ethanol several times, and the sample is dried and collected to obtain an embedded face-to-face 2D-In2S3 / 2D-ZnSe composite photocatalytic material. The content of In2S3 in the composite photocatalyst is 10%.

[0037] The composite photocatalytic material prepared in this example has a photocatalytic degradation efficiency of 86.36% for 2-thiolbenzothiazole under visible light irradiation for 60 minutes.

[0038] The composite photocatalytic material prepared in this example produced 680.12 mol / L of hydrogen peroxide when irradiated with visible light for 120 min.

[0039] Figure 2 Shown is the SEM image of the composite photocatalyst sample 2 prepared in Example 2. It can be seen from the figure that the small flakes of ZnSe are tightly embedded in the In2S3 nanosheets in a face-to-face form, proving that the composite material has been successfully prepared. The close interfacial contact is conducive to the transmission of photogenerated carriers and enhances the photocatalytic activity of the overall material. Example 3

[0040] (1) 4 mmol ZnCl2 and 6 mmol SeO2 were dispersed in 50 mL NMP and ultrasonically dispersed for 30 minutes. 16 mmol EDTA was then added. The mixture was stirred at room temperature for 30 minutes and then transferred to an autoclave at 200°C for 20 hours to obtain flaky ZnSe through a hydrothermal reaction.

[0041] (2) Weigh 9.2318 g of ZnSe nanosheets and dissolve them in a mixture of 30 mL of deionized water and ethanol. Stir magnetically for 30 minutes. Then add 2.9322 g of InCl3·4H2O and 1.5026 g of TAA, stir and ultrasonicate for 30 minutes. Transfer the mixture to a polytetrafluoroethylene-lined stainless steel autoclave for hydrothermal reaction at 180 °C for 24 h. After the reaction, cool naturally and obtain a precipitate by centrifugation. The precipitate is washed with deionized water and ethanol several times, and the sample is dried and collected to obtain an embedded face-to-face 2D In2S3 / 2D ZnSe composite photocatalytic material. The content of In2S3 in the composite photocatalyst is 15%.

[0042] The composite photocatalytic material prepared in this example has a photocatalytic degradation efficiency of 94.58% for 2-thiolbenzothiazole under visible light irradiation for 60 minutes.

[0043] The composite photocatalytic material prepared in this example produced 1048.25 mol / L of hydrogen peroxide when irradiated with visible light for 120 min.

[0044] Figure 3 Shown is the PL graph of the composite photocatalyst sample 3 prepared in Example 3. It can be seen from the figure that compared with ZnSe, the PL emission intensity of the In2S3 / ZnSe composite is greatly reduced, indicating that the formation of a heterojunction between the two materials effectively improves the migration efficiency of photogenerated carriers and significantly enhances the photocatalytic activity.

[0045] To further illustrate the advantages of the composite photocatalytic material prepared in the present invention in terms of photocatalytic degradation efficiency and hydrogen peroxide production for 2-mercaptobenzothiazole, a comparative experiment was conducted. The two monomer materials, In2S3 and ZnSe, were physically mixed. The experimental steps for ZnSe nanosheets were the same as in Example 3. It was not necessary to add ZnSe nanosheets to the composite material when preparing the In2S3 monomer. Under the same experimental conditions and the same In2S3 content, it was found that after simple physical mixing, the composite photocatalytic material prepared had a photocatalytic degradation efficiency of only 74.62% for 2-mercaptobenzothiazole after 60 minutes of visible light irradiation; after 120 minutes of visible light irradiation, the hydrogen peroxide production was 620.37 mol / L. Example 4

[0046] (1) 5 mmol ZnCl2 and 10 mmol SeO2 were dispersed in 60 mL DMAc and ultrasonically dispersed for 40 minutes. 25 mmol EDTA was then added. The mixture was stirred at room temperature for 40 minutes and then transferred to an autoclave at 220°C for 24 hours to obtain flaky ZnSe via a hydrothermal reaction.

[0047] (2) Weigh 13.0332 g of ZnSe nanosheets and dissolve them in a mixture of 40 mL of deionized water and ethanol. Stir magnetically for 35 minutes. Then add 5.8648 g of InCl3·4H2O and 3.0052 g of TAA, stir and ultrasonicate for 40 minutes. Transfer the mixture to a polytetrafluoroethylene-lined stainless steel autoclave for hydrothermal reaction at 220 °C for 28 hours. After the reaction, cool naturally and obtain a precipitate by centrifugation. The precipitate is washed with deionized water and ethanol several times, and the sample is dried and collected to obtain an embedded face-to-face 2D-In2S3 / 2D-ZnSe composite photocatalytic material. The content of In2S3 in the composite photocatalyst is 20%.

[0048] The composite photocatalytic material prepared in this example has a photocatalytic degradation efficiency of 80.54% for 2-thiolbenzothiazole under visible light irradiation for 60 minutes.

[0049] The composite photocatalytic material prepared in this example produced 820.56 mol / L of hydrogen peroxide when irradiated with visible light for 120 min.

[0050] Figure 4 The solid-state UV-visible absorption spectrum of composite photocatalyst sample 4, prepared in Example 4, shows that the absorption edge of the In2S3 / ZnSe composite material is red-shifted relative to the ZnSe monomer, with a light absorption cutoff edge of 751.58 nm. This demonstrates that the composite has enhanced visible light absorption capacity, and the enhanced light-harvesting ability can generate more photogenerated electrons for the photocatalytic reaction. Example 5

[0051] (1) 6 mmol ZnCl2 and 15 mmol SeO2 were dispersed in 70 mL DMAc and ultrasonically dispersed for 50 minutes. 36 mmol H2C2O4 was then added. The mixture was stirred at room temperature for 50 minutes and then transferred to an autoclave at 240°C for 28 hours to obtain flaky ZnSe via a hydrothermal reaction.

[0052] (2) Weigh 19.5498 g of ZnSe nanosheets and dissolve them in a mixture of 50 mL of deionized water and ethanol. Stir magnetically for 40 minutes. Then add 11.7296 g of InCl3·4H2O and 6.0104 g of TAA, stir and ultrasonicate for 50 minutes. Transfer the mixture to a polytetrafluoroethylene-lined stainless steel autoclave for hydrothermal reaction at 260 °C for 32 hours. After the reaction, cool naturally and obtain a precipitate by centrifugation. The precipitate is washed with deionized water and ethanol several times, and the sample is dried and collected to obtain an embedded face-to-face 2D-In2S3 / 2D-ZnSe composite photocatalytic material. The content of In2S3 in the composite photocatalyst is 25%.

[0053] The composite photocatalytic material prepared in this example has a photocatalytic degradation efficiency of 75.38% for 2-thiolbenzothiazole under visible light irradiation for 60 minutes.

[0054] The composite photocatalytic material prepared in this example produced 730.12 mol / L of hydrogen peroxide when irradiated with visible light for 120 min.

[0055] Figure 5 The XRD pattern of the sample prepared in Example 5 is shown. From the figure, it can be seen that the characteristic peaks of the (103), (400), and (440) crystal planes of In2S3 appear. In addition, due to the influence of In2S3, the characteristic peak of the (311) crystal plane of ZnSe in the composite material spectrum also shifts slightly, indicating that there is an interaction between the two monomer materials, proving that the composite material has been successfully prepared.

[0056] Figure 6 This is a transient photocurrent diagram of the composite photocatalyst sample 5 prepared in Example 5. Compared with the monomer, the photocurrent density of the In2S3 / ZnSe composite photocatalytic material is greatly improved, proving that the composite material has faster photogenerated electron migration and separation capabilities.

[0057] The embodiments described are preferred implementations of the present invention, but the present invention is not limited to the above implementations. Any obvious improvements, substitutions or modifications that can be made by those skilled in the art without departing from the essence of the present invention are within the scope of protection of the present invention.

Claims

1. A method for preparing an embedded face-to-face 2D-In2S3 / 2D-ZnSe composite photocatalytic material, characterized in that: Follow these steps: (1) Dispersing ZnCl2 and SeO2 in an organic solvent, ultrasonically dispersing for 10-50 minutes, then adding an organic acid, stirring at room temperature for 10-50 minutes, and then transferring it to a high-pressure reactor to obtain flaky ZnSe through a hydrothermal reaction; (2) Weigh ZnSe nanosheets and dissolve them in a mixed solution of deionized water and ethanol, and stir them magnetically for 20-40 minutes; then add InCl3·4H2O and thioacetamide, stir and ultrasonicate for 10-50 minutes; transfer the mixture to a polytetrafluoroethylene-lined stainless steel autoclave for hydrothermal reaction, cool it naturally after the reaction, obtain a precipitate by centrifugation, wash the precipitate with deionized water and ethanol several times, and dry it to obtain an embedded face-to-face 2D In2S3 / 2D ZnSe composite photocatalytic material.

2. The method for preparing the embedded face-to-face 2D-In2S3 / 2D-ZnSe composite photocatalytic material according to claim 1, characterized in that: In step (1), the molar ratio of ZnCl2 and SeO2 is 1:1~2.5, and the amount of organic solvent used is 30~70mL.

3. The method for preparing the embedded face-to-face 2D-In2S3 / 2D-ZnSe composite photocatalytic material according to claim 1, characterized in that: The molar amount of the organic acid in step (1) is 2 to 6 times that of ZnCl2 or SeO2.

4. The method for preparing the embedded face-to-face 2D-In2S3 / 2D-ZnSe composite photocatalytic material according to claim 1, characterized in that: In step (1), the hydrothermal reaction temperature is 160-240° C., and the reaction time is 12-28 h.

5. The method for preparing the embedded face-to-face 2D-In2S3 / 2D-ZnSe composite photocatalytic material according to claim 1, characterized in that: In step (2), the usage ratio of ZnSe, InCl3·4H2O and thioacetamide is: 3~19.6g: 0.29~12g: 0.15~6g; and the ratio of water to ethanol in the mixed solution of water and ethanol is 1:

1.

6. The method for preparing the embedded face-to-face 2D-In2S3 / 2D-ZnSe composite photocatalytic material according to claim 1, characterized in that: The hydrothermal reaction temperature in step (2) is 100-260° C., and the reaction time is 16-32 h.

7. The method for preparing the embedded face-to-face 2D-In2S3 / 2D-ZnSe composite photocatalytic material according to claim 1, characterized in that: The organic solvent in step (1) is N,N-dimethylformamide, N-methylpyrrolidone or dimethylacetamide.

8. The method for preparing the embedded face-to-face 2D-In2S3 / 2D-ZnSe composite photocatalytic material according to claim 1, characterized in that: The organic acid in step (1) is oxalic acid, ethylenediaminetetraacetic acid or citric acid.

9. An embedded face-to-face 2D-In2S3 / 2D-ZnSe composite photocatalytic material prepared by the preparation method according to any one of claims 1 to 8, characterized in that: Both ZnSe and In2S3 have 2D lamellar structures, and the In2S3 lamellar structure is embedded in the ZnSe lamellar structure; the mass ratio of In2S3 in the composite photocatalytic material is 5%~25%.

10. The use of the embedded face-to-face 2D-In2S3 / 2D-ZnSe composite photocatalytic material according to claim 9, characterized in that: Used for catalytic preparation of hydrogen peroxide under visible light and photocatalytic degradation of harmful substances in sewage.

Images