A Ni3ZnC 0.7 ZnCdS photocatalysts, their preparation methods, and applications.

Abstract

This invention discloses a Ni3ZnC 0.7 This invention relates to the field of energy materials technology, specifically to a NiZn precursor prepared from nickel chloride hexahydrate, zinc acetate, urea, and aminophosphonic acid resins via low-temperature drying. The precursor is then mixed with melamine and polypyrrole and sintered at high temperature to obtain Ni3ZnC. 0.7 The co-catalyst was finally combined with ZnCdS in situ via a hydrothermal method to obtain Ni3ZnC 0.7 / ZnCdS composite photocatalyst; this catalyst forms a Mott-Schottky heterojunction, which can effectively suppress the recombination of photogenerated electron-hole pairs, accelerate charge transport, and significantly improve the photocatalytic hydrogen evolution performance; the process of this invention is simple, the conditions are easy to control, and the production cost is low, making it suitable for industrial production and showing good application prospects in the field of photocatalytic water splitting for hydrogen production.

Description

Technical Field

[0001] This invention belongs to the field of functional materials technology, and relates to photocatalytic materials, specifically to a Ni3ZnC... 0.7 / ZnCdS photocatalyst, its preparation method and application. Background Technology

[0002] With global economic development and population growth, the contradiction between energy supply and demand and environmental pollution problems are becoming increasingly prominent. Hydrogen energy, as a recognized new generation of sustainable and clean energy, has advantages such as high efficiency, environmental protection, and energy saving. It is widely regarded as an ideal medium for solar energy storage and is expected to play an important role in future energy conversion. Photocatalytic hydrogen evolution technology can directly convert solar energy into chemical energy and is the core path for green and sustainable hydrogen production. Efficient and stable photocatalysts are the key to the industrial application of this technology.

[0003] Currently, photocatalytic hydrogen evolution materials generally face technical bottlenecks such as low visible light utilization, high recombination rate of photogenerated carriers, insufficient exposure of active sites, and severe photocorrosion, resulting in low solar-to-hydrogen energy conversion efficiency and difficulty in meeting practical application requirements. Among common photocatalytic systems, metal sulfides have become semiconductor materials with great application potential due to their tunable band gap, wide visible light response range, and band edge position matching the thermodynamic requirements of hydrogen evolution reaction.

[0004] ZnCdS solid solution combines the chemical stability of ZnS with the strong visible light absorption of CdS, making it a typical high-efficiency sulfur-based photocatalytic material. However, pure ZnCdS has two major drawbacks: first, it exhibits significant photocorrosion, is easily oxidized and degraded during the reaction, and has poor cycle stability; second, it has a high recombination rate of photogenerated electron-hole pairs, resulting in low charge separation efficiency, and its hydrogen evolution activity when used alone is far from meeting industrial requirements. Therefore, constructing heterojunction structures by supporting co-catalysts has become the mainstream modification strategy for improving the charge separation efficiency of ZnCdS, suppressing photocorrosion, and enhancing catalytic activity.

[0005] Ni3ZnC 0.7 As a typical bimetallic carbide, it possesses intrinsic metallic properties, a characteristic that is beneficial for increasing the electron transport rate within the catalytic bulk phase, thereby enhancing reaction kinetics. However, most reported carbides are generated by high-temperature calcination, and their microstructures are mostly composed of aggregated particles and blocky structures. This is highly detrimental to the exposure of catalytically active sites and electron transfer during photocatalytic reactions, thus limiting further enhancement of their intrinsic activity. Summary of the Invention

[0006] To address the shortcomings of the existing technology, the present invention aims to provide a Ni3ZnC 0.7 / ZnCdS photocatalyst, its preparation method and application, by using Ni3ZnC0.7 By combining it with ZnCdS, a composite photocatalytic material with fully exposed active sites, strong visible light response, good cycle stability, and excellent catalytic performance can be prepared. Moreover, the preparation method is simple, the production cost is low, and it is easy to industrialize.

[0007] This invention is achieved through the following technical solution: A Ni3ZnC 0.7 The preparation method of ZnCdS photocatalyst includes the following steps: Step 1: Prepare NiZn precursor solid A using a low-temperature solvent evaporation method; Step 2: Mix solid A with melamine at a mass ratio of (1~3):(2~5), disperse in anhydrous ethanol, sonicate and stir thoroughly, dry and grind to obtain mixed powder B; Step 3: Weigh powder B and polypyrrole at a mass ratio of (5~15):(0.5~3), grind them thoroughly in a mortar, place them in a white porcelain boat, and put them in a tube furnace. Heat the furnace to 400~700℃ at a heating rate of 2~10℃ / min, and hold for 1~3 hours. After the product cools down, remove it and grind it to obtain powder C, i.e., Ni3ZnC. 0.7 Photocatalytic co-catalyst; Step 4: Powder C is then placed in ammonia water along with cadmium acetate, zinc acetate, thioacetamide, sodium hexadecylbenzenesulfonate, and polyvinylpyrrolidone. After ultrasonication and thorough stirring, the mixture is transferred to a polytetrafluoroethylene hydrothermal reactor and placed in an oven at 120-160°C for 8-12 hours. After the reaction is complete, the reactor is allowed to cool naturally. The mixture is then washed, dried, and ground to obtain Ni3ZnC. 0.7 / ZnCdS photocatalyst; The molar ratio of cadmium acetate, zinc acetate, thioacetamide, sodium hexadecylbenzenesulfonate, and polyvinylpyrrolidone is (1~5):(1~6):(2~12):(0.5~2):(0.3~1), and powder C is mixed with cadmium acetate at a mass ratio of (0.5~2):(3~10); the ratio of powder C to ammonia water is (0.01~0.8) g:(30~60) mL. The ammonia solution is obtained by diluting 28% analytical grade ammonia solution with ultrapure water, and the volume ratio of analytical grade ammonia solution to ultrapure water is (1~1.5):(3~10).

[0008] The present invention also has the following technical features: Preferably, the process of preparing NiZn precursor solid A by low-temperature solvent evaporation in step one includes: Nickel chloride hexahydrate, zinc acetate, urea, and aminophosphonic acid resin were prepared in a molar ratio of (1~5):(0.5~3):(1~3):(0.01~1), with 0.01~0.02 g of aminophosphonic acid resin added. Then, 30~100 mL of deionized water was added, and the mixture was sonicated and stirred thoroughly before being poured into a petri dish. The petri dish was placed in an oven and kept at 40~60 ℃ for 10~16 h. After the temperature in the oven dropped to room temperature, the dish was removed and ground to obtain solid A, i.e., the NiZn precursor.

[0009] Furthermore, the ultrasonication and thorough stirring involves ultrasonicating for 30-100 minutes and then stirring on a magnetic stirrer for 60-180 minutes.

[0010] Preferably, the ultrasonication and thorough stirring in steps two and four consist of ultrasonication for 40-150 min followed by stirring with a magnetic stirrer for 60-180 min.

[0011] Preferably, the washing in step four involves centrifuging and washing with deionized water and anhydrous ethanol 3 to 5 times respectively.

[0012] Preferably, the drying process described in steps two and four involves placing the product in a vacuum drying oven at 40-60°C for 12-24 hours.

[0013] Preferably, the grinding is performed using a mortar and pestle for 20 to 90 minutes.

[0014] This invention also protects a Ni3ZnC prepared by the method described above. 0.7 / ZnCdS photocatalyst and its application in photocatalytic water splitting for hydrogen release.

[0015] Compared with the prior art, the present invention has the following beneficial effects: This invention uses NiZn as a precursor to prepare Ni3ZnC by solid-state sintering. 0.7 The co-catalyst is then used to in-situ composite ZnCdS via a one-step hydrothermal method to form a Mott-Schottky heterostructure composite photocatalyst; Ni3ZnC 0.7 Exhibiting intrinsic metallic properties, it can significantly enhance the photogenerated carrier transport rate and accelerate the hydrogen evolution reaction kinetics. Due to the difference in work function at the interface, the energy band of ZnCdS is bent and a Schottky barrier is formed, which effectively prevents electron backflow and suppresses electron-hole pair recombination. At the same time, local charge transfer occurs at the heterojunction interface, which regulates the electronic structure and optimizes the adsorption energy of intermediates, resulting in a synergistic enhancement effect. This significantly improves the photocatalytic hydrogen evolution activity and stability. The prepared catalyst has fully exposed active sites, strong visible light response, and good cycle stability, showing good application prospects in the field of photocatalytic hydrogen production. The preparation process of this invention is simple, the conditions are controllable, no impurity phase atoms are introduced, and the cost is low, making it suitable for large-scale production. Attached Figure Description

[0016] Figure 1 Ni3ZnC prepared in Example 1 0.7 X-ray diffraction pattern of ZnCdS; Figure 2 Ni3ZnC prepared in Example 1 0.7 Scan image of / ZnCdS; Figure 3 Ni3ZnC prepared in Example 1 0.7 The hydrogen evolution performance of / ZnCdS under visible light. Detailed Implementation

[0017] The present invention will be further described in detail below with reference to specific embodiments. These descriptions are for explanation purposes only and are not intended to limit the scope of the invention.

[0018] Example 1: Step 1: Prepare nickel chloride hexahydrate, zinc acetate, urea, and aminophosphonic acid resin in a molar ratio of 3:1:2:0.5, with 0.015 g of aminophosphonic acid resin added. Add 60 mL of deionized water, sonicate for 50 min, stir on a magnetic stirrer for 100 min, pour into a petri dish, place the petri dish in an oven, keep at 60 ℃ for 10 h, and after the temperature in the oven drops to room temperature, remove it and grind it in a mortar and pestle for 20 min to obtain solid A, i.e., NiZn precursor. Step 2: Mix solid A with melamine at a mass ratio of 1:3 and place in 40 mL of anhydrous ethanol. After sonication for 150 min, stir with a magnetic stirrer for 180 min, then place in a vacuum drying oven at 40 ℃ for 24 h and grind with a mortar for 20 min to obtain mixed powder B. Step 3: Take powder B and polypyrrole at a mass ratio of 8:1, grind them thoroughly in a mortar, place them in a white porcelain boat, and put the boat into a tube furnace. Heat the furnace to 550 °C at a rate of 5 °C / min, and hold for 3 hours. After the product cools, remove it and grind it in a mortar for 90 min to obtain powder C, namely Ni3ZnC. 0.7 Photocatalytic co-catalyst; Step 4: Mix powder C with cadmium acetate, zinc acetate, thioacetamide, sodium hexadecylbenzenesulfonate, and polyvinylpyrrolidone in ammonia water until homogeneous. The molar ratio of cadmium acetate, zinc acetate, thioacetamide, sodium hexadecylbenzenesulfonate, and polyvinylpyrrolidone is 3:3:9:1:0.5 to obtain the precursor solution. Powder C and cadmium acetate are mixed at a mass ratio of 1:10. The ratio of powder to ammonia water is 0.05 g:50 mL. The ammonia water is obtained by diluting analytical grade ammonia water with ultrapure water at a volume ratio of 1:10. After sonicating the resulting mixture for 40 min, stir it with a magnetic stirrer for 180 min and then transfer it to a 100 mL polytetrafluoroethylene hydrothermal reactor. Place it in an oven at 140 °C for 10 h. After the reaction is complete, allow the hydrothermal reactor to cool naturally and then centrifuge it. Wash it three times each with deionized water and anhydrous ethanol, and then place it in a vacuum drying oven at 40 °C. Dry at ℃ for 16 h, and finally collect and grind in a mortar for 60 min to obtain Ni3ZnC. 0.7 / ZnCdS photocatalyst.

[0019] Figure 1 Ni3ZnC prepared in Example 1 0.7 X-ray diffraction pattern of the / ZnCdS sample, where the horizontal axis represents the 2θ angle and the vertical axis represents the diffraction peak intensity. The figure shows the Ni3ZnC... 0.7 The diffraction peak positions of the ZnCdS sample can accurately correspond to those of Ni3ZnC. 0.7 PDF#04-001-7136 and Zn 0.5 Cd 0.5 S PDF#04-001-8669 indicates that Ni3ZnC was successfully prepared. 0.7 / ZnCdS photocatalyst.

[0020] Figure 2 Ni3ZnC prepared in Example 1 0.7 Scan image of the ZnCdS sample. Ni3ZnC is clearly visible. 0.7 Both ZnCdS and Ni3ZnC exhibit a nanoparticle structure. 0.7 The nanoparticle structure in the ZnCdS sample exhibits a certain degree of dispersion.

[0021] Figure 3 Ni3ZnC prepared in Example 1 0.7 The hydrogen production energy diagram of / ZnCdS under visible light for 4 hours clearly shows that the photocatalyst prepared in this invention has good visible light hydrogen production performance, opening up a new path for bimetallic carbides as co-catalysts for carbon nitride.

[0022] Example 2: Step 1: Prepare nickel chloride hexahydrate, zinc acetate, urea, and aminophosphonic acid resin in a molar ratio of 2:1:1:0.03, with 0.01 g of aminophosphonic acid resin added. Add 100 mL of deionized water, sonicate for 100 min, stir on a magnetic stirrer for 120 min, pour into a petri dish, place the petri dish in an oven, keep at 50 ℃ for 12 h, and after the temperature in the oven drops to room temperature, remove it and grind it in a mortar and pestle for 20 min to obtain solid A, i.e., NiZn precursor. Step 2: Mix solid A with melamine at a mass ratio of 2:5 and place in 30 mL of anhydrous ethanol. After sonication for 40 min, stir with a magnetic stirrer for 180 min and then place in a vacuum drying oven at 50 °C for 18 h. Grind in a mortar for 20 min to obtain mixed powder B. Step 3: Take powder B and polypyrrole at a mass ratio of 10:3, grind them thoroughly in a mortar, place them in a white porcelain boat, and put them in a tube furnace. Heat the furnace to 600 °C at a rate of 2 °C / min and hold for 2 hours. After the product cools, take it out and grind it in a mortar for 20 minutes to obtain powder C, namely Ni3ZnC. 0.7 Photocatalytic co-catalyst; Step 4: Mix powder C with cadmium acetate, zinc acetate, thioacetamide, sodium hexadecylbenzenesulfonate, and polyvinylpyrrolidone in ammonia water until homogeneous. The molar ratio of cadmium acetate, zinc acetate, thioacetamide, sodium hexadecylbenzenesulfonate, and polyvinylpyrrolidone is 3:5:4:1:0.6 to obtain the precursor solution. Powder C and cadmium acetate are mixed at a mass ratio of 0.6:7. The ratio of powder to ammonia water is 0.3 g:30 mL. The ammonia water is obtained by diluting analytical grade ammonia water with ultrapure water. The volume ratio of analytical grade ammonia water to ultrapure water is 1.25:6. The resulting mixture was sonicated for 100 min, stirred with a magnetic stirrer for 80 min, and then transferred to a 100 mL polytetrafluoroethylene hydrothermal reactor. It was then placed in an oven at 160 °C for 8 h. After the reaction, the hydrothermal reactor was allowed to cool naturally and then centrifuged. The mixture was washed four times each with deionized water and anhydrous ethanol, and then dried in a vacuum drying oven at 50 °C for 14 h. Finally, the mixture was collected and ground in a mortar for 50 min to obtain Ni3ZnC. 0.7 / ZnCdS photocatalyst.

[0023] Example 3: Step 1: Prepare nickel chloride hexahydrate, zinc acetate, urea, and aminophosphonic acid resin in a molar ratio of 4:3:2:0.8, with 0.012 g of aminophosphonic acid resin added. Add 60 mL of deionized water, sonicate for 60 min, stir on a magnetic stirrer for 180 min, pour into a petri dish, place the petri dish in an oven, keep at 60 ℃ for 14 h, and after the temperature in the oven drops to room temperature, remove it and grind it in a mortar and pestle for 20 min to obtain solid A, i.e., NiZn precursor. Step 2: Mix solid A with melamine at a mass ratio of 2:5 and place in 50 mL of anhydrous ethanol. After sonicating for 10 min, stir with a magnetic stirrer for 60 min, then place in a vacuum drying oven at 60 ℃ for 12 h and grind with a mortar for 20 min to obtain mixed powder B. Step 3: Take powder B and polypyrrole at a mass ratio of 8:3, grind them thoroughly in a mortar, place them in a white porcelain boat, and put the boat into a tube furnace. Heat the furnace to 700 °C at a rate of 7 °C / min and hold for 1.5 h. After the product cools, remove it and grind it in a mortar for 20 min to obtain powder C, namely Ni3ZnC. 0.7 Photocatalytic co-catalyst; Step 4: Mix powder C with cadmium acetate, zinc acetate, thioacetamide, sodium hexadecylbenzenesulfonate, and polyvinylpyrrolidone in ammonia water until homogeneous. The molar ratio of cadmium acetate, zinc acetate, thioacetamide, sodium hexadecylbenzenesulfonate, and polyvinylpyrrolidone is 4:3:7:1.2:0.6 to obtain the precursor solution. Powder C and cadmium acetate are mixed at a mass ratio of 1.5:8. The ratio of powder to ammonia water is 0.65 g:50 mL. The ammonia water is obtained by diluting analytical grade ammonia water with ultrapure water. The volume ratio of analytical grade ammonia water to ultrapure water is 1.2:9. The resulting mixed solution was sonicated for 100 min, stirred with a magnetic stirrer for 60 min, and then transferred to a 100 mL polytetrafluoroethylene hydrothermal reactor. It was then placed in an oven at 150 °C for 10 h. After the reaction, the hydrothermal reactor was allowed to cool naturally and then centrifuged. The solution was washed four times each with deionized water and anhydrous ethanol, and then dried in a vacuum drying oven at 60 °C for 16 h. Finally, the solution was collected and ground in a mortar for 60 min to obtain Ni3ZnC. 0.7 / ZnCdS photocatalyst.

[0024] Example 4: Step 1: Prepare nickel chloride hexahydrate, zinc acetate, urea, and aminophosphonic acid resin in a molar ratio of 1:0.5:1:0.01, with 0.01 g of aminophosphonic acid resin added. Add 30 mL of deionized water, sonicate for 100 min, stir on a magnetic stirrer for 60 min, pour into a petri dish, place the petri dish in an oven, keep at 40 ℃ for 16 h, and after the temperature in the oven drops to room temperature, remove it and grind it in a mortar and pestle for 60 min to obtain solid A, i.e., NiZn precursor; Step 2: Mix solid A with melamine at a mass ratio of 1:2 and place in 30 mL of anhydrous ethanol. After sonication for 40 min, stir with a magnetic stirrer for 180 min and then place in a vacuum drying oven at 40 °C for 12 h. Grind with a mortar and pestle for 60 min to obtain mixed powder B. Step 3: Take powder B and polypyrrole at a mass ratio of 5:3, grind them thoroughly in a mortar, place them in a white porcelain boat, and put them in a tube furnace. Heat the furnace to 400 °C at a rate of 2 °C / min, and hold for 3 hours. After the product cools, take it out and grind it in a mortar for 60 min to obtain powder C, namely Ni3ZnC. 0.7 Photocatalytic co-catalyst; Step 4: Mix powder C with cadmium acetate, zinc acetate, thioacetamide, sodium hexadecylbenzenesulfonate, and polyvinylpyrrolidone in ammonia water until homogeneous. The molar ratio of cadmium acetate, zinc acetate, thioacetamide, sodium hexadecylbenzenesulfonate, and polyvinylpyrrolidone is 1:1:2:0.5:0.3 to obtain the precursor solution. Powder C and cadmium acetate are mixed at a mass ratio of 0.5:3. The ratio of powder to ammonia water is 0.01 g:30 mL. The ammonia water is obtained by diluting analytical grade ammonia water with ultrapure water, and the volume ratio of analytical grade ammonia water to ultrapure water is 1:3. The resulting mixed solution was sonicated for 40 min, stirred with a magnetic stirrer for 60 min, and then transferred to a 100 mL polytetrafluoroethylene hydrothermal reactor. It was then placed in an oven at 120 °C for 12 h. After the reaction, the hydrothermal reactor was allowed to cool naturally and then centrifuged. The solution was washed three times each with deionized water and anhydrous ethanol, and then dried in a vacuum drying oven at 40 °C for 12 h. Finally, the solution was collected and ground in a mortar for 20 min to obtain Ni3ZnC. 0.7 / ZnCdS photocatalyst.

[0025] Example 5: Step 1: Prepare nickel chloride hexahydrate, zinc acetate, urea, and aminophosphonic acid resin in a molar ratio of 5:3:3:1, with 0.02 g of aminophosphonic acid resin added. Add 100 mL of deionized water, sonicate for 30 min, stir on a magnetic stirrer for 180 min, pour into a petri dish, place the petri dish in an oven, keep at 60 ℃ for 10 h, and after the temperature in the oven drops to room temperature, remove it and grind it in a mortar and pestle for 90 min to obtain solid A, i.e., NiZn precursor; Step 2: Mix solid A with melamine at a mass ratio of 3:5 and place in 60 mL of anhydrous ethanol. After sonication for 150 min, stir with a magnetic stirrer for 180 min, then place in a vacuum drying oven at 60 ℃ for 24 h and grind with a mortar for 90 min to obtain mixed powder B. Step 3: Take powder B and polypyrrole at a mass ratio of 15:0.5, grind them thoroughly in a mortar, place them in a white porcelain boat, and put them in a tube furnace. Heat the furnace to 700 °C at a rate of 10 °C / min, and hold for 1 hour. After the product cools, take it out and grind it in a mortar for 90 min to obtain powder C, namely Ni3ZnC. 0.7 Photocatalytic co-catalyst; Step 4: Mix powder C with cadmium acetate, zinc acetate, thioacetamide, sodium hexadecylbenzenesulfonate, and polyvinylpyrrolidone in ammonia water until homogeneous. The molar ratio of cadmium acetate, zinc acetate, thioacetamide, sodium hexadecylbenzenesulfonate, and polyvinylpyrrolidone is 5:6:12:2:1 to obtain the precursor solution. Powder C and cadmium acetate are mixed at a mass ratio of 2:10. The ratio of powder to ammonia water is 0.8 g:60 mL. The ammonia water is obtained by diluting analytical grade ammonia water with ultrapure water, and the volume ratio of analytical grade ammonia water to ultrapure water is 1.5:10. After sonicating the resulting mixture for 150 min, stir it with a magnetic stirrer for 180 min, and then transfer it to a 100 mL polytetrafluoroethylene hydrothermal reactor. Place it in an oven at 160 °C for 8 h. After the reaction is complete, allow the hydrothermal reactor to cool naturally and then centrifuge it. Wash it five times each with deionized water and anhydrous ethanol, and then dry it in a vacuum drying oven at 60 °C for 24 hours. h, and finally collect it and grind it in a mortar for 90 min to obtain Ni3ZnC. 0.7 / ZnCdS photocatalyst.

[0026] Although embodiments of the present invention have been shown and described, various changes, modifications, substitutions and variations made by those skilled in the art without departing from the principles and spirit of the present invention are all within the scope of protection of the present invention.

Claims

1. A Ni3ZnC 0.7 The method for preparing ZnCdS photocatalyst is characterized by, Includes the following steps: Step 1: Prepare NiZn precursor solid A using a low-temperature solvent evaporation method; Step 2: Mix solid A with melamine at a mass ratio of (1~3):(2~5), disperse in anhydrous ethanol, sonicate and stir thoroughly, dry and grind to obtain mixed powder B; Step three, powder B and polypyrrole are weighed according to the mass ratio (5-15):(0.5-3), and then placed in a white porcelain boat after being ground in a mortar, and then placed in a tube furnace, and then heated to 400-700 DEG C at a heating rate of 2-10 DEG C / min, and then kept for 1-3 h, and then ground after the product is cooled, and then powder C, i.e. Ni3ZnC 0.7 Photocatalytic cocatalyst Step 4: Powder C is then placed in ammonia water with cadmium acetate, zinc acetate, thioacetamide, sodium hexadecylbenzenesulfonate, and polyvinylpyrrolidone. After ultrasonication and thorough stirring, the mixture is transferred to a polytetrafluoroethylene hydrothermal reactor and placed in an oven at 120-160 ℃ for 8-12 h. After the reaction is completed, the hydrothermal reactor is allowed to cool naturally. After washing, drying, and grinding, the Ni3ZnC0.7 / ZnCdS photocatalyst is obtained. The molar ratio of cadmium acetate, zinc acetate, thioacetamide, sodium hexadecylbenzenesulfonate, and polyvinylpyrrolidone is (1~5):(1~6):(2~12):(0.5~2):(0.3~1), and powder C is mixed with cadmium acetate at a mass ratio of (0.5~2):(3~10); the ratio of powder C to ammonia water is (0.01~0.8) g:(30~60) mL. The ammonia solution is obtained by diluting 28% analytical grade ammonia solution with ultrapure water, and the volume ratio of analytical grade ammonia solution to ultrapure water is (1~1.5):(3~10).

2. The Ni3ZnC according to claim 1 0.7 The method for preparing ZnCdS photocatalyst is characterized by, The process of preparing NiZn precursor solid A by low-temperature solvent evaporation in step one includes: Nickel chloride hexahydrate, zinc acetate, urea, and aminophosphonic acid resin were mixed in a molar ratio of (1~5):(0.5~3):(1~3):(0.01~1), with 0.01~0.02 g of aminophosphonic acid resin added. Then, 30~100 mL of deionized water was added, and the mixture was sonicated and stirred thoroughly before being poured into a petri dish. The petri dish was placed in an oven and kept at 40~60 ℃ for 10~16 h. After the temperature in the oven dropped to room temperature, the dish was removed and ground to obtain solid A, i.e., the NiZn precursor.

3. The Ni3ZnC according to claim 2 0.7 The method for preparing ZnCdS photocatalyst is characterized by, The process of sonicating and thoroughly stirring involves sonicating for 30-100 minutes and then stirring on a magnetic stirrer for 60-180 minutes.

4. The Ni3ZnC according to claim 1 0.7 The method for preparing ZnCdS photocatalyst is characterized by, The ultrasonication and thorough stirring mentioned in steps two and four involve ultrasonication for 40-150 minutes followed by stirring with a magnetic stirrer for 60-180 minutes.

5. The Ni3ZnC according to claim 1 0.7 The method for preparing ZnCdS photocatalyst is characterized by, The washing described in step four involves centrifuging and washing with deionized water and anhydrous ethanol 3 to 5 times respectively.

6. The Ni3ZnC according to claim 1 0.7 The method for preparing ZnCdS photocatalyst is characterized by, The drying process described in steps two and four involves placing the product in a vacuum drying oven at 40-60°C for 12-24 hours.

7. The Ni3ZnC according to claim 1 or 2 0.7 The method for preparing ZnCdS photocatalyst is characterized by, The grinding process involves grinding in a mortar and pestle for 20-90 minutes.

8. A Ni3ZnC prepared according to the method of any one of claims 1 to 7 0.7 / ZnCdS photocatalyst.

9. A Ni3ZnC according to claim 8 0.7 Application of ZnCdS photocatalyst in photocatalytic water splitting and hydrogen release reaction.

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