Method for preparing efficient photocatalyst from electric furnace dust to produce hydrogen through photocatalytic hydrolysis

Abstract

The invention relates to the technical field of solid waste recycling and energy recycling, in particular to a method for producing hydrogen through photocatalytic hydrolysis by using an efficient photocatalyst prepared from electric furnace dust, which comprises the following steps: collecting the electric furnace dust from steel plants or other industrial processes, mixing the electric furnace dust with 0.1 M of HCI, stirring, removing surface impurities and soluble salts, and purifying to obtain the hydrogen. Filtering and drying to obtain a solid product; the method comprises the following steps: ultrasonically dispersing acid-washed electric furnace dust and CdS in ethanol according to a composite ratio of 1: 1-1: 10, stirring at 70 DEG C until ethanol is volatilized, and calcining the obtained solid powder to finally obtain the EAFD / CdS heterojunction photocatalyst. The method comprises the following steps: stirring and dissolving Na2S and Na2SO3 in 100 mL of pure water, adding 5-20 mg of an EAVD / CdS catalyst, stirring in the dark, introducing inert gas to discharge air, taking gas, analyzing by using a gas chromatograph, irradiating by using a rare element lamp as a simulated light source, and starting to produce hydrogen.

Description

Technical Field

[0001] This invention relates to the field of solid waste resource utilization and energy recycling technology, and more specifically, to a method for preparing a high-efficiency photocatalyst for photocatalytic water electrolysis to produce hydrogen using electric furnace dust. Background Technology

[0002] Currently, the fossil fuels we heavily rely on, such as coal, oil, and natural gas, are not only non-renewable, but the greenhouse gases they produce, such as carbon dioxide, are major contributors to global warming. Therefore, finding and developing a clean, renewable, and carbon-neutral new energy system has become an urgent strategic need for the world.

[0003] Against this backdrop, hydrogen energy, with its high calorific value, combustion product of only water, and truly zero carbon emissions, is considered the most promising clean energy source of the 21st century. However, how to produce hydrogen on a large scale in a "green" and economical manner remains a core bottleneck hindering the development of hydrogen energy. Current mainstream hydrogen production methods, such as "grey hydrogen" obtained through fossil fuel reforming, involve significant carbon emissions, while "green hydrogen" produced by electrolyzing water using renewable energy is costly and reliant on expensive power infrastructure. Scientists have been exploring a more direct, economical, and sustainable hydrogen production pathway. Since the groundbreaking report on photoelectrochemical water splitting on TiO2 electrodes, photocatalytic hydrogen evolution has attracted considerable attention and is considered a promising strategy for producing clean, low-cost, and environmentally friendly energy using solar energy. Semiconductor photocatalysts, as a core component of photocatalytic hydrogen evolution systems, have received extensive research attention. To date, many candidates, such as TiO2, gC3N4, and ZnFe2O4, have been studied as effective photocatalysts for feasible solar fuel conversion.

[0004] Electric furnace dust (EAFD), a byproduct of the steel industry, is a type of solid waste that can burden the environment if not properly disposed of. Currently, most EAFD is disposed of through landfills, which can have a significant environmental impact. Therefore, converting EAFD into useful materials is considered an important way to solve these problems. Recent studies have found that EAFD possesses unique physical and chemical properties, making it a potential high-efficiency photocatalyst for photocatalytic water splitting to produce hydrogen. EAFD mainly contains iron and zinc. Iron exists primarily in the form of magnetite (Fe3O4) and zinc ferrite (ZnFe2O4), while zinc exists in the form of zinc ore (ZnO) and zinc ferrite (ZnFe2O4). ZnFe2O4 and ZnO are common photocatalytic materials used for water splitting to produce hydrogen. Heterojunction photocatalytic materials have been shown to exhibit excellent photocatalytic activity under visible light irradiation. Currently, much research focuses on synthesizing this photocatalytic material using chemical synthesis methods. However, the photocatalytic activity of this material is often affected by its band gap energy, thus it is rarely used as a single-phase photocatalyst. Furthermore, photocatalysts synthesized using various methods suffer from high preparation costs and complex processes. Utilizing low-cost solid waste material, electric furnace dust, to prepare heterojunction photocatalytic materials for water electrolysis to produce hydrogen, achieving the goal of turning waste into treasure, has great application potential.

[0005] Therefore, a method for preparing zinc ferrite-based heterojunction photocatalytic hydrolysis to produce hydrogen using electric furnace dust is proposed to solve the above-mentioned problems. Summary of the Invention

[0006] To overcome the shortcomings mentioned above, this invention aims to provide a method for preparing a high-efficiency photocatalyst for photocatalytic water splitting to produce hydrogen using electric furnace dust, which can solve the above problems.

[0007] The objective of this invention is achieved through the following technical solution:

[0008] A method for preparing a high-efficiency photocatalyst for photocatalytic water splitting to produce hydrogen using electric furnace dust includes the following steps:

[0009] Step 1: Collect electric furnace dust from steel plants or other industrial processes, mix the electric furnace dust with 0.1M HCl and stir to remove surface impurities and soluble salts, filter and dry to obtain a solid product;

[0010] Step 2: The acid-washed electric furnace dust and CdS are ultrasonically dispersed into ethanol at a composite ratio of 1:1-1:10. Then, the mixture is stirred at 70°C until the ethanol evaporates. The resulting solid powder is then calcined to obtain the EAFD / CdS heterojunction photocatalyst.

[0011] Step 3: Dissolve Na2S and Na2SO3 in 100mL of pure water by stirring, then add 5mg-20mg of EAFD / CdS catalyst. Stir in the dark and purge the air with inert gas, take the gas and analyze it with a gas chromatograph. Then, use a rare element lamp as a simulated light source to irradiate and start hydrogen production.

[0012] Furthermore, in step one, the solid-liquid ratio of the electric furnace dust and 0.1M HCl is 1:80 g / mL.

[0013] Furthermore, the preparation method of CdS is as follows:

[0014] Cd(CH3COO)2∙2H2O was added to a polytetrafluoroethylene reactor, followed by the addition of ethylenediamine and pure water. After complete dissolution, thioacetamide was added, and the mixture was stirred and heated in an oven. After heating, the mixture was cooled, washed, and dried to obtain CdS.

[0015] Furthermore, the preparation method of CdS is as follows:

[0016] 2.4 g of Cd(CH3COO)2∙2H2O was added to a 100 ml polytetrafluoroethylene reactor, followed by 30 ml of ethylenediamine and 30 ml of pure water. After complete dissolution, 0.94 g of thioacetamide was added, and the mixture was stirred and heated in an oven at 220 °C for 24 h. After cooling to room temperature, the mixture was washed with pure water and ethanol and then dried at 80 °C to obtain CdS.

[0017] Furthermore, in step two, calcination is carried out in a tube furnace by introducing N2 as a carrier gas, heating to 180°C at a heating rate of 5°C / min, and holding for two hours.

[0018] Furthermore, in step three, the rare element lamp is a xenon lamp with a power of 160 MW / cm². 2 -180MW / cm 2 .

[0019] Furthermore, in step three, the inert gas is argon.

[0020] Furthermore, in step three, after dissolution, the concentration of Na2S is 0.35M and the concentration of Na2SO3 is 0.25M.

[0021] Furthermore, in step three, the inert gas is passed through for at least 30 minutes.

[0022] Furthermore, in step three, a 1ml injection needle is used to take a sample of gas and analyze it using a gas chromatograph. After the air is completely expelled, the simulated light source irradiation for hydrogen production is started.

[0023] Compared with the prior art, the beneficial effects of the present invention are:

[0024] ①This invention can utilize solid waste generated by the steel industry with high added value, reducing resource waste and environmental pollution.

[0025] ② The heterojunction material obtained by combining acid-washed EAFD with CdS exhibits excellent photogenerated electron and hole separation capabilities, thus possessing superior photocatalytic activity and promising application prospects in the field of energy regeneration. Photocatalysts, as photocatalytic materials in water electrolysis for hydrogen production, offer advantages such as simple operation, low cost, and high hydrogen production rate, meeting practical application requirements.

[0026] ③ The prepared material has the characteristics of being magnetic and recyclable, which solves the problem of the difficulty in recycling and reusing photocatalysts and has a good application prospect. Attached Figure Description

[0027] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings:

[0028] Figure 1 X-ray diffraction patterns of phase composition of electric furnace dust treated by different methods.

[0029] Figure 2 SEM and TEM images of EAFD / CdS.

[0030] Figure 3 Figure 1 shows the hydrogen production performance of a heterojunction composed of electric furnace dust and CdS.

[0031] Figure 4 Comparison of hydrogen production performance of EAFD / CdS heterojunction photocatalysts with different composite ratios;

[0032] Figure 5 Comparison of hydrogen production performance of EAFD / CdS heterojunction photocatalysts with different dosages

[0033] Figure 6 Comparison of hydrogen production performance of EAFD / CdS heterojunction photocatalysts under different light irradiation powers.

[0034] Figure 7 This is a graph showing the hydrogen production effect after four photocatalytic hydrogen evolution cycles.

[0035] Figure 8 This is a diagram showing the magnetic separation effect of the photocatalyst after the reaction is complete. Detailed Implementation

[0036] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0037] The method for preparing a high-efficiency photocatalyst for photocatalytic water splitting to produce hydrogen using electric furnace dust in this invention includes the following steps:

[0038] Step 1: Collect electric furnace dust from steel plants or other industrial processes. Mix the electric furnace dust EAFD with 0.1M HCl at a ratio of 1:80 and stir to remove surface impurities and soluble salts. After filtration, dry in an oven at 80-100℃ for 3-10 hours to obtain a solid product.

[0039] Step 2: Add 2.4g of Cd(CH3COO)2∙2H2O to a 100ml polytetrafluoroethylene reactor, then add 30ml of ethylenediamine (EDA) and pure water. After complete dissolution, add 0.94g of thioacetamide (TAA), stir, and heat in an oven at 220℃ for 24h. After cooling to room temperature, wash with pure water and ethanol, and dry at 80℃ to obtain CdS.

[0040] Step 3: Disperse the acid-washed EAFD and CdS into 30ml of ethanol, sonicate at 60% power (180W) for 20min, then stir at 70℃ until the ethanol evaporates, and then calcine the resulting solid powder at 180℃ for 2h in a tube furnace under N2 (5℃ / min) atmosphere to finally obtain the EAFD / CdS heterojunction photocatalyst.

[0041] Step 4: Dissolve 0.35M Na₂S + 0.25M Na₂SO₃ in 100mL of pure water by stirring. Add 5mg-20mg of EAFD / CdS heterojunction catalyst. Stir in the dark and purge with argon gas for 30 minutes to purge air. Take a sample of the gas using a 1mL syringe and analyze it using a gas chromatograph. Then, use a 120MW / cm² chromatograph. 2 -200MW / cm 2 A xenon lamp was used as a simulated light source to irradiate and begin producing hydrogen. Every hour, 1 ml of the produced gas was collected and injected into a gas chromatograph for analysis.

[0042] In the later stage of hydrogen yield detection, gas chromatography was used to determine the hydrogen production. First, a curve was plotted to compare the peak area with the H2 content. After detection, the total hydrogen production in the headspace was calculated using the gas molar volume of 22.4 L / mol and the sealed headspace volume of the photocatalytic reactor. Then, the hydrogen production rate was obtained by dividing by the reaction time and the amount of catalyst used.

[0043] Example 1:

[0044] The method for preparing a high-efficiency photocatalyst for photocatalytic water splitting to produce hydrogen using electric furnace dust in this embodiment includes the following steps:

[0045] Step 1: Collect electric furnace dust (EAFD) from steel mills or other industrial processes. Mix the EAFD with 0.1M HCl at a ratio of 1:80 and stir to remove surface impurities and soluble salts. After filtration, dry the mixture in an oven at 80°C for 10 hours to obtain a solid product.

[0046] Step 2: Add 2.4g of Cd(CH3COO)2∙2H2O to a 100ml polytetrafluoroethylene reactor, then add 30ml of ethylenediamine (EDA) and 30ml of pure water. After complete dissolution, add 0.94g of thioacetamide (TAA), stir, and heat in an oven at 220℃ for 24h. After cooling to room temperature, wash with pure water and ethanol, and dry at 80℃ to obtain CdS.

[0047] Step 3: Disperse the acid-washed electric furnace dust and CdS in 30ml of ethanol at a 1:1 ratio, sonicate at 180W for 20min at 60% power, then stir at 70℃ until the ethanol evaporates, and then calcine the resulting solid powder at 180℃ for 2h in a tube furnace under N2 (5℃ / min) atmosphere to finally obtain the EAFD / CdS heterojunction photocatalyst.

[0048] Step 4: Dissolve 0.35M Na₂S and 0.25M Na₂SO₃ in 100mL of pure water by stirring. Add 5mg of EAFD / CdS heterojunction photocatalyst. Stir in the dark and purge with argon gas for 30 minutes to purge air. Take a sample of the gas using a 1mL syringe and analyze it using a gas chromatograph. Then, use a power of 180MW / cm². 2 A xenon lamp was used as a simulated light source to irradiate and initiate hydrogen production. Every hour, 1 ml of the produced gas was collected and analyzed by a gas chromatograph. First, a curve was plotted comparing peak area and H2 content. After detection, the total hydrogen production in the headspace was calculated using the gas molar volume of 22.4 L / mol and the sealed headspace volume of the photocatalytic reactor. This was then divided by the reaction time and catalyst dosage to obtain a hydrogen production rate of 2118.88 mmol / g / h.

[0049] Example 2:

[0050] The method for preparing a high-efficiency photocatalyst for photocatalytic water splitting to produce hydrogen using electric furnace dust in this embodiment includes the following steps:

[0051] Step 1: Collect electric furnace dust from steel mills or other industrial processes. Mix the electric furnace dust with 0.1M HCl at a ratio of 1:80 and stir to remove surface impurities and soluble salts. After filtration, dry the mixture in an oven at 80°C for 10 hours to obtain a solid product.

[0052] Step 2: Add 2.4g of Cd(CH3COO)2∙2H2O to a 100ml polytetrafluoroethylene reactor, then add 30ml of ethylenediamine EDA and 30ml of pure water. After complete dissolution, add 0.94g of thioacetamide, stir, and heat in an oven at 220℃ for 24h. After cooling to room temperature, wash with pure water and ethanol, and dry at 80℃ to obtain CdS.

[0053] Step 3: Disperse the acid-washed electric furnace dust and CdS in 30ml of ethanol at a ratio of 1:3, sonicate at 180W for 20min at 60% power, then stir at 70℃ until the ethanol evaporates, and then calcine the resulting solid powder at 180℃ for 2h in a tube furnace under N2 (5℃ / min) atmosphere to finally obtain the EAFD / CdS heterojunction photocatalyst.

[0054] Step 4: Dissolve 0.35M Na₂S and 0.25M Na₂SO₃ in 100mL of pure water by stirring. Add 10mg of EAFD / CdS heterojunction photocatalyst. Stir in the dark and purge with argon gas for 30 minutes to purge air. Take a sample of the gas using a 1mL syringe and analyze it using a gas chromatograph. Then, use a power of 160MW / cm². 2 A xenon lamp was used as a simulated light source to irradiate and initiate hydrogen production. Every hour, 1 ml of the produced gas was collected and analyzed by a gas chromatograph. First, a curve was plotted comparing peak area and H2 content. After detection, the total hydrogen production in the headspace was calculated using the gas molar volume of 22.4 L / mol and the sealed headspace volume of the photocatalytic reactor. This was then divided by the reaction time and catalyst dosage to obtain a hydrogen production rate of 1210.72 mmol / g / h.

[0055] Example 3:

[0056] The method for preparing a high-efficiency photocatalyst for photocatalytic water splitting to produce hydrogen using electric furnace dust in this embodiment includes the following steps:

[0057] Step 1: Collect electric furnace dust from steel mills or other industrial processes. Mix the electric furnace dust with 0.1M HCl at a ratio of 1:80 and stir to remove surface impurities and soluble salts. After filtration, dry the mixture in an oven at 80°C for 10 hours to obtain a solid product.

[0058] Step 2: Add 2.4g of Cd(CH3COO)2∙2H2O to a 100ml polytetrafluoroethylene reactor, then add 30ml of ethylenediamine EDA and 30ml of pure water. After complete dissolution, add 0.94g of thioacetamide, stir, and heat in an oven at 220℃ for 24h. After cooling to room temperature, wash with pure water and ethanol, and dry at 80℃ to obtain CdS.

[0059] Step 3: Disperse the acid-washed electric furnace dust and CdS in 30ml of ethanol at a ratio of 1:5, sonicate at 180W for 20min at 60% power, then stir at 70℃ until the ethanol evaporates, and then calcine the resulting solid powder at 180℃ for 2h in a tube furnace under N2 (5℃ / min) atmosphere to finally obtain the EAFD / CdS heterojunction photocatalyst.

[0060] Step 4: Dissolve 0.35M Na₂S and 0.25M Na₂SO₃ in 100mL of pure water by stirring. Add 20mg of EAFD / CdS heterojunction photocatalyst. Stir in the dark and purge with argon gas for 30 minutes to purge air. Take a sample of the gas using a 1mL syringe and analyze it using a gas chromatograph. Then, use a power of 160MW / cm². 2 A xenon lamp was used as a simulated light source to irradiate and initiate hydrogen production. Every hour, 1 ml of the produced gas was collected and analyzed by a gas chromatograph. First, a curve was plotted comparing peak area and H2 content. After detection, the total hydrogen production in the headspace was calculated using the gas molar volume of 22.4 L / mol and the sealed headspace volume of the photocatalytic reactor. This was then divided by the reaction time and catalyst dosage to obtain a hydrogen production rate of 309.63 mmol / g / h.

[0061] Depend on Figure 1 The XRD pattern shows that the EAFD / CdS structure corresponds to the ZnFe2O4 and CdS standard cards, while... Figure 2 The SEM and TEM images show that ZnFe2O4 is uniformly loaded on CdS nanorods, and the lattice fringe spacing corresponds to their respective crystal planes, proving that there is a close interaction between the two, further confirming that a heterojunction was successfully constructed, rather than just a physical mixture.

[0062] like Figure 3 As shown, Figure 3 The figure shows a line graph illustrating the relationship between hydrogen production and time for hydrogen production via hydrolysis using EAFD and CdS as catalysts alone, EAFD / CdS heterojunction photocatalysts in a 1:7 ratio, and a composite catalyst of pure ZnFe2O4 and CdS. This demonstrates that the EAFD / CdS heterojunction photocatalyst prepared at a 1:7 ratio achieves a hydrogen production rate comparable to or even better than the composite catalyst of pure ZnFe2O4 and CdS, proving the significant advantage of this synthesis ratio.

[0063] like Figure 4 As shown, Figure 4 The diagram shows that 0.35M Na₂S + 0.25M Na₂SO₃ were dissolved in 100mL of pure water by stirring, and then 20mg of EAFD / CdS heterojunction photocatalyst in different proportions was added. The mixture was stirred in the dark, and argon gas was passed through for 30 minutes to purge the air. A gas sample was taken once using a 1mL syringe and analyzed by gas chromatography. Then, a power of 160MW / cm² was used. 2 A bar graph showing the relationship between different ratios of EAFD / CdS heterojunction photocatalysts and hydrogen production rate is generated when a xenon lamp is used as a simulated light source to irradiate and begin hydrogen production.

[0064] like Figure 5 As shown, Figure 5 The diagram shows that 0.35M Na₂S + 0.25M Na₂SO₃ were dissolved in 100mL of pure water by stirring, and then different amounts of EAFD / CdS heterojunction photocatalyst in a 1:7 ratio were added. The mixture was stirred in the dark, and argon gas was passed through for 30 minutes to purge the air. A gas sample was taken once using a 1mL syringe and analyzed by gas chromatography. The analysis was then performed using a power of 160MW / cm². 2 A bar graph showing the relationship between different ratios of EAFD / CdS heterojunction photocatalysts and hydrogen production rate is generated when a xenon lamp is used as a simulated light source to irradiate and begin hydrogen production.

[0065] like Figure 6 As shown, Figure 6 The figure shows the relationship between different ratios of EAFD / CdS heterojunction photocatalyst and hydrogen production rate. The reaction mixture consisted of 0.35M Na2S + 0.25M Na2SO3 dissolved in 100mL of pure water, followed by the addition of 5mg of EAFD / CdS heterojunction photocatalyst at a ratio of 1:7. The mixture was stirred in the dark and purged with argon gas for 30 minutes to purge the air. A 1ml sample was then taken and analyzed by gas chromatography. Subsequently, different power xenon lamps were used as simulated light sources to irradiate the mixture and begin hydrogen production.

[0066] Figure 4-6 This indicates that the hydrogen production effect of this invention is better under the conditions of an EAFD to CdS ratio of 1:7, a catalyst dosage of 5 mg, and higher light power. However, considering that the actual solar intensity is 100 MW / cm², the actual hydrogen production effect is not optimal. 2 Therefore, the median value of 160 MW / cm² was subsequently selected. 2 Further experiments will be conducted based on the light intensity.

[0067] Figure 7 The cycling experiment shown for the same EAFD / CdS heterojunction photocatalyst demonstrates that after four repeated experiments, the EAFD / CdS heterojunction photocatalyst of this invention still exhibits good hydrogen production activity, with the hydrogen production rate remaining above 80%.

[0068] Figure 8 The hysteresis curve and magnetic recycling effect both prove that the material has good magnetic recyclability and is easy to reuse.

[0069] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for preparing a high-efficiency photocatalyst for photocatalytic water splitting to produce hydrogen using electric furnace dust, characterized in that, Includes the following steps: Step 1: Collect electric furnace dust from steel plants or other industrial processes, mix the electric furnace dust with 0.1M HCl and stir to remove surface impurities and soluble salts, filter and dry to obtain a solid product; Step 2: The acid-washed electric furnace dust and CdS are ultrasonically dispersed into ethanol at a composite ratio of 1:1-1:

10. Then, the mixture is stirred at 70°C until the ethanol evaporates. The resulting solid powder is then calcined to obtain the EAFD / CdS heterojunction photocatalyst. Step 3: Dissolve Na2S and Na2SO3 in 100mL of pure water by stirring, then add 5mg-20mg of EAFD / CdS catalyst. Stir in the dark and purge the air with inert gas, take the gas and analyze it with a gas chromatograph. Then, use a rare element lamp as a simulated light source to irradiate and start hydrogen production.

2. The method for preparing a high-efficiency photocatalyst for photocatalytic water splitting to produce hydrogen using electric furnace dust according to claim 1, characterized in that, In step one, the solid-liquid ratio of the electric furnace dust and 0.1M HCl is 1:80 g / mL.

3. The method for preparing a high-efficiency photocatalyst for photocatalytic water splitting to produce hydrogen using electric furnace dust according to claim 1, characterized in that, The preparation method of CdS is as follows: Cd(CH3COO)2∙2H2O was added to a polytetrafluoroethylene reactor, followed by the addition of ethylenediamine and pure water. After complete dissolution, thioacetamide was added, and the mixture was stirred and heated in an oven. After heating, the mixture was cooled, washed, and dried to obtain CdS.

4. The method for preparing a high-efficiency photocatalyst for photocatalytic water splitting to produce hydrogen using electric furnace dust according to claim 2, characterized in that, The preparation method of CdS is as follows: 2.4 g of Cd(CH3COO)2∙2H2O was added to a 100 ml polytetrafluoroethylene reactor, followed by 30 ml of ethylenediamine and 30 ml of pure water. After complete dissolution, 0.94 g of thioacetamide was added, and the mixture was stirred and heated in an oven at 220 °C for 24 h. After cooling to room temperature, the mixture was washed with pure water and ethanol and then dried at 80 °C to obtain CdS.

5. The method for preparing a high-efficiency photocatalyst for photocatalytic water splitting to produce hydrogen using electric furnace dust according to claim 1, characterized in that, In step two, calcination is carried out in a tube furnace by introducing N2 as a carrier gas, heating to 180°C at a heating rate of 5°C / min, and holding for two hours.

6. The method for preparing a high-efficiency photocatalyst for photocatalytic water splitting to produce hydrogen using electric furnace dust according to claim 1, characterized in that, In step three, the rare element lamp is a xenon lamp with a power of 160 MW / cm². 2 -180MW / cm 2 .

7. The method for preparing a high-efficiency photocatalyst for photocatalytic water splitting to produce hydrogen using electric furnace dust according to claim 1, characterized in that, In step three, the inert gas is argon.

8. The method for preparing a high-efficiency photocatalyst for photocatalytic water splitting to produce hydrogen using electric furnace dust according to claim 1, characterized in that, In step three, after dissolution, the concentration of Na2S is 0.35M and the concentration of Na2SO3 is 0.25M.

9. The method for preparing a high-efficiency photocatalyst for photocatalytic water splitting to produce hydrogen using electric furnace dust according to claim 8, characterized in that, In step three, the inert gas is passed through for at least 30 minutes.

10. The method for preparing a high-efficiency photocatalyst for photocatalytic water splitting to produce hydrogen using electric furnace dust according to claim 9, characterized in that, In step three, a 1ml injection needle is used to take a sample of gas and analyze it using a gas chromatograph. After the air is completely expelled, the simulated light source irradiation to produce hydrogen is started.

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