Fe-g-C3N4 / MoO 3-x Preparation method of photocatalyst and its application in photo-Fenton oxidation for the removal of humic acid in water

Abstract

This invention belongs to the field of composite material technology and relates to a Fe-g-C3N4 / MoO 3‑x The preparation method of the photocatalyst includes: dissolving Fe source in melamine aqueous solution, ultrasonically homogenizing, drying at 60-90℃ for 12-24h, placing the obtained solid in a muffle furnace, heating to 500-550℃ at a heating rate of 5℃ / min, calcining for 2-4h, cooling to room temperature, and grinding into powdered Fe-g-C3N4; adding molybdenum powder to a mixed solution of ethanol and H2O2 and stirring evenly, adding the powdered Fe-g-C3N4 and dispersing and mixing evenly, placing in a reaction vessel, sealing, and solvothermal reaction at 120-160℃ for 9-12h, and naturally cooling to room temperature to obtain Fe-g-C3N4 / MoO 3‑x The preparation process of this invention is simple and the oxygen vacancy concentration is controllable. The free radicals generated by photo-Fenton oxidation rapidly degrade humic acid in water. The prepared material was applied to remove simulated humic acid from water. Experimental results showed that the humic acid removal rate reached up to 90.54% after 120 minutes of reaction, providing reliable theoretical and experimental support for practical applications.

Description

Technical Field

[0001] This invention belongs to the field of composite material technology, and relates to photocatalysts, specifically to a Fe-g-C3N4 / MoO4 composite material. 3-x Preparation method of photocatalyst and its application in photo-Fenton oxidation to remove humic acid from water. Background Technology

[0002] In recent years, with rapid economic development, ensuring drinking water safety through efficient and environmentally friendly technologies has become a critical issue that urgently needs to be addressed. Humic acid is a major component of natural organic matter in surface water sources. As one of the sources of organic pollutants in surface water, it significantly affects the treatment efficiency of water treatment processes such as coagulation and disinfection. Furthermore, it can lead to the proliferation of microorganisms in urban water distribution networks, thus impacting water quality. Notably, during chlorination disinfection, humic acid acts as a precursor, reacting with active chlorine to generate toxic disinfection byproducts, such as trihalomethanes and haloacetic acids, which are carcinogenic and teratogenic, posing a serious threat to the environment and human health. Effective removal of humic acid from water is crucial for controlling disinfection byproducts, improving water quality, and protecting public health.

[0003] Advanced oxidation technologies have broad application prospects in environmental remediation. They can generate highly reactive oxygen free radicals, efficiently degrade organic pollutants, and achieve the harmless treatment of pollutants. Among many advanced oxidation technologies, photo-Fenton oxidation technology has attracted widespread attention due to its high efficiency, wide applicability, and environmental friendliness, and has been used to remove various organic pollutants. However, traditional photo-Fenton oxidation technology has some shortcomings that limit its practical application. For example, the photocatalyst has low utilization rate of visible light, and the rapid recombination of photogenerated electron-hole pairs leads to low concentration of photogenerated electrons and Fe. 3+ / Fe 2+ The conversion efficiency is slow, and the efficient activation of H2O2 and PMS is limited, thus significantly increasing the processing cost. Therefore, developing novel visible light-driven photocatalysts that can rapidly separate photogenerated electron-hole pairs and achieve high transport efficiency of photogenerated carriers is key to efficient photoFenton systems. Summary of the Invention

[0004] To address the problems of low visible light utilization and rapid recombination of photogenerated electrons and holes in existing photocatalytic materials, the present invention aims to disclose a Fe-g-C3N4 / MoO4 material. 3-x Preparation method of photocatalyst.

[0005] This catalyst is a modified nanocomposite material targeting the easy recombination of photogenerated electron-hole pairs and the low visible light utilization of Fe-g-C3N4, incorporating MoO 3-xNanoparticles loaded on bulk Fe-g-C3N4 exhibit good photo-Fenton oxidation removal effect on humic acid, and can quickly and efficiently remove humic acid from water.

[0006] Technical solution

[0007] A Fe-g-C3N4 / MoO 3-x The preparation method of photocatalyst includes the following steps:

[0008] a) Dissolve the Fe source in an aqueous melamine solution, sonicate to homogenize, and dry at 60–90°C for 12–24 h, preferably at 60°C for 24 h. Place the resulting solid in a muffle furnace and calcine at 500–550°C for 2–4 h, preferably at 550°C for 2 h. Cool to room temperature and grind into powdered Fe-

[0009] g-C3N4;

[0010] b) Add molybdenum powder to a mixed solution of ethanol and H2O2 and stir until homogeneous. Add powdered Fe-g-C3N4 and disperse and mix evenly. Place the mixture in a reaction vessel, seal it, and solvothermal react at 120–160°C for 9–12 hours, preferably 160°C for 12 hours. Allow it to cool naturally to room temperature, wash it several times with deionized water and ethanol, and dry it at 60°C for 12 hours to obtain Fe-g-C3N4 / MoO. 3-x .

[0011] Here, the range of x is 0 ≤ x ≤ 1.

[0012] In a preferred embodiment of the present invention, the Fe source in step a) is Fe(NO3)3·9H2O or FeSO4·7H2O, preferably Fe(NO3)3·9H2O.

[0013] In a preferred embodiment of the present invention, the concentration of the melamine aqueous solution in step a) is 8-12 wt%.

[0014] In a preferred embodiment of the present invention, the mass-to-volume ratio of Fe source to melamine aqueous solution in step a) is 0.08–0.32 g: 20–40 mL, preferably 0.08 g: 30 mL.

[0015] In a preferred embodiment of the present invention, the mass-to-volume ratio of molybdenum powder, ethanol, H2O2 and powdered Fe-g-C3N4 in step b) is 0.02-0.1g:25mL:1-5mL:0.1-0.5g, preferably 0.1g:25mL:4mL:0.4g.

[0016] Fe-g-C3N4 / MoO prepared by the method described in this invention 3-x Photocatalyst, in which Fe-g-C3N4 exhibits a bulk structure, and MoO3-x It is granular, MoO 3-x Nanoparticles are uniformly grown on the surface of bulk Fe-g-C3N4.

[0017] The composite material forms a Z-shaped heterojunction that drives rapid separation of photogenerated carriers. Rich in oxygen vacancies, it exhibits a strong localized plasmon effect, broadening the photoresponse range and increasing the concentration of photogenerated electrons. Simultaneously, Fe doping with g-C3N4 promotes Fe... 2+ / Fe 3+ The rapid conversion effectively promotes the efficient activation of H2O2 and PMS, thereby improving the photo-Fenton oxidation effect.

[0018] Another object of the present invention is to improve the quality of the prepared Fe-g-C3N4 / MoO 3-x Photocatalysts are used in photo-Fenton oxidation to remove humic acid from water.

[0019] The laboratory experiment simulating the removal of humic acid from water by photo-Fenton oxidation follows these steps:

[0020] Using a 500W xenon lamp as the visible light source, 20 mg of catalyst was added to a humic acid solution (50 mL, 10 mg / L). Before xenon lamp irradiation, the solution was stirred in the dark for 30 min to reach catalyst adsorption-desorption equilibrium. Hydrogen peroxide (or PMS) was added, the xenon lamp was turned on, and water samples were taken every 30 min. The solution was filtered through a 0.22 μm aqueous filter to remove the photocatalyst, and the absorbance was measured using a UV-Vis spectrophotometer to determine the humic acid removal rate.

[0021] The humic acid removal rate is calculated using the following formula:

[0022]

[0023] Beneficial effects

[0024] The preparation process of this invention is simple and the oxygen vacancy concentration is controllable. The free radicals generated by photo-Fenton oxidation rapidly degrade humic acid in water. The prepared material was used to remove simulated humic acid from water. Experimental results show that Fe-g-C3N4 / MoO 3-x The H2O2 system, after reacting for 120 minutes, achieved a 90.54% removal rate of humic acid. (Fe-g-C3N4 / MoO2) 3-x The PMS system achieved a humic acid removal rate of 97.23% after 120 minutes of reaction, providing reliable theoretical and practical support for its application. Attached Figure Description

[0025] Figure 1 .Fe-g-C3N4 / MoO 3-x SEM image of the photocatalyst;

[0026] Figure 2 .Fe-g-C3N4 / MoO 3-x The removal rate of humic acid by the / H2O2 system is as follows: humic acid solution concentration: 10 mg / L; humic acid solution volume: 50 mL; H2O2: 2 mM.

[0027] Figure 3 .Fe-g-C3N4 / MoO 3-x The removal rate of humic acid by the PMS system, where the concentration of humic acid solution is 10 mg / L; the volume of humic acid solution is 50 mL; and the PMS concentration is 1 mM. Detailed Implementation

[0028] The present invention will be described in detail below with reference to embodiments, so that those skilled in the art can better understand the present invention, but the present invention is not limited to the following embodiments.

[0029] Example 1

[0030] A Fe-g-C3N4 / MoO 3-x The preparation method of photocatalyst includes the following steps:

[0031] a) Mix 30 mL of water and 4 g of melamine, and stir thoroughly for 40 min to obtain solution A;

[0032] b) Add 0.08 g of Fe(NO3)3·9H2O to solution A and sonicate for 30 min to obtain solution B;

[0033] c) Place solution B in an oven at 60°C for 24 hours to dry, and obtain solid C;

[0034] d) Place solid C in a crucible of appropriate size, put it in a muffle furnace and heat it in air at a rate of 5℃ / min, hold it at 550℃ for 2h, cool it to room temperature and grind it to obtain powder D (Fe-g-C3N4);

[0035] e) Mix ethanol and H2O2 at a volume ratio of 25:1 and stir thoroughly for 20 minutes to obtain solution E;

[0036] f) Add 0.1g of molybdenum powder to solution E to obtain solution F;

[0037] g) Add 0.4g of powder D to solution F to obtain mixed solution G;

[0038] h) The mixed liquid G was placed in a reaction vessel of suitable size and reacted solvothermally at 160°C for 12 h. The product was washed several times with deionized water and ethanol, and then dried in an oven at 60°C for 12 h to obtain Fe-g-C3N4 / MoO 3-x .

[0039] Photocatalyst prepared in Example 1, Fe-g-C3N4 / MoO 3-x The removal rate of humic acid by the / H2O2 system is as follows: Figure 1 As shown, when the photocatalyst dosage reaches 0.02 g / 50 mL and the H2O2 dosage is 2 mM, the removal rate of humic acid can reach 80.17%.

[0040] Example 2

[0041] A Fe-g-C3N4 / MoO 3-x The preparation method of photocatalyst includes the following steps:

[0042] a) Mix 30 mL of water and 4 g of melamine, and stir thoroughly for 40 min to obtain solution A;

[0043] b) Add 0.08 g of Fe(NO3)3·9H2O to solution A and sonicate for 30 min to obtain solution B;

[0044] c) Place solution B in an oven at 60°C for 24 hours to dry, and obtain solid C;

[0045] d) Place solid C in a crucible of appropriate size, put it in a muffle furnace and heat it in air at a rate of 5℃ / min, hold it at 550℃ for 2h, cool it to room temperature and grind it to obtain powder D (Fe-g-C3N4);

[0046] e) Mix ethanol and H2O2 at a volume ratio of 25:2 and stir thoroughly for 20 minutes to obtain solution E;

[0047] f) Add 0.1g of molybdenum powder to solution E to obtain solution F;

[0048] g) Add 0.4g of powder D to solution F to obtain mixed solution G;

[0049] h) The mixed liquid G was placed in a reaction vessel of suitable size and reacted solvothermally at 160°C for 12 h. The product was washed several times with deionized water and ethanol, and then dried in an oven at 60°C for 12 h to obtain Fe-g-C3N4 / MoO 3-x .

[0050] Photocatalyst prepared in Example 2, Fe-g-C3N4 / MoO 3-x The removal rate of humic acid by the / H2O2 system is as follows: Figure 1 As shown, when the photocatalyst dosage reaches 0.02 g / 50 mL and the H2O2 dosage is 2 mM, the removal rate of humic acid can reach 82.29%.

[0051] Example 3

[0052] A Fe-g-C3N4 / MoO 3-x The preparation method of photocatalyst includes the following steps:

[0053] a) Mix 30 mL of water and 4 g of melamine, and stir thoroughly for 40 min to obtain solution A;

[0054] b) Add 0.08 g of Fe(NO3)3·9H2O to solution A and sonicate for 30 min to obtain solution B;

[0055] c) Place solution B in an oven at 60°C for 24 hours to dry, and obtain solid C;

[0056] d) Place solid C in a crucible of appropriate size, put it in a muffle furnace and heat it in air at a rate of 5℃ / min, hold it at 550℃ for 2h, cool it to room temperature and grind it to obtain powder D (Fe-g-C3N4);

[0057] e) Mix ethanol and H2O2 at a volume ratio of 25:3 and stir thoroughly for 20 minutes to obtain solution E;

[0058] f) Add 0.1g of molybdenum powder to solution E to obtain solution F;

[0059] g) Add 0.4g of powder D to solution F to obtain mixed solution G;

[0060] h) The mixed liquid G was placed in a reaction vessel of suitable size and reacted solvothermally at 160°C for 12 h. The product was washed several times with deionized water and ethanol, and then dried in an oven at 60°C for 12 h to obtain Fe-g-C3N4 / MoO 3-x .

[0061] Photocatalyst prepared in Example 3, Fe-g-C3N4 / MoO 3-x The removal rate of humic acid by the / H2O2 system is as follows: Figure 1 As shown, when the photocatalyst dosage reaches 0.02 g / 50 mL and the H2O2 dosage is 2 mM, the removal rate of humic acid can reach 85.72%.

[0062] Example 4

[0063] A Fe-g-C3N4 / MoO 3-x The preparation method of photocatalyst includes the following steps:

[0064] a) Mix 30 mL of water and 4 g of melamine, and stir thoroughly for 40 min to obtain solution A;

[0065] b) Add 0.08 g of Fe(NO3)3·9H2O to solution A and sonicate for 30 min to obtain solution B;

[0066] c) Place solution B in an oven at 60°C for 24 hours to dry, and obtain solid C;

[0067] d) Place solid C in a crucible of appropriate size, put it in a muffle furnace and heat it in air at a rate of 5℃ / min, hold it at 550℃ for 2h, cool it to room temperature and grind it to obtain powder D (Fe-g-C3N4);

[0068] e) Mix ethanol and H2O2 at a volume ratio of 25:4 and stir thoroughly for 20 minutes to obtain solution E;

[0069] f) Add 0.1g of molybdenum powder to solution E to obtain solution F;

[0070] g) Add 0.4g of powder D to solution F to obtain mixed solution G;

[0071] h) The mixed liquid G was placed in a reaction vessel of suitable size and reacted solvothermally at 160°C for 12 h. The product was washed several times with deionized water and ethanol, and then dried in an oven at 60°C for 12 h to obtain Fe-g-C3N4 / MoO 3-x .

[0072] Photocatalyst prepared in Example 4, Fe-g-C3N4 / MoO 3-x The removal rate of humic acid by the / H2O2 system is as follows: Figure 1 As shown, when the photocatalyst dosage reaches 0.02 g / 50 mL and the H2O2 dosage is 2 mM, the removal rate of humic acid can reach 90.54%.

[0073] Example 5

[0074] A Fe-g-C3N4 / MoO 3-x The preparation method of photocatalyst includes the following steps:

[0075] a) Mix 30 mL of water and 4 g of melamine, and stir thoroughly for 40 min to obtain solution A;

[0076] b) Add 0.08 g of Fe(NO3)3·9H2O to solution A and sonicate for 30 min to obtain solution B;

[0077] c) Place solution B in an oven at 60°C for 24 hours to dry, and obtain solid C;

[0078] d) Place solid C in a crucible of appropriate size, put it in a muffle furnace and heat it in air at a rate of 5℃ / min, hold it at 550℃ for 2h, cool it to room temperature and grind it to obtain powder D (Fe-g-C3N4);

[0079] e) Mix ethanol and H2O2 at a volume ratio of 25:5 and stir thoroughly for 20 minutes to obtain solution E;

[0080] f) Add 0.1g of molybdenum powder to solution E to obtain solution F;

[0081] g) Add 0.4g of powder D to solution F to obtain mixed solution G;

[0082] h) The mixed liquid G was placed in a reaction vessel of suitable size and reacted solvothermally at 160°C for 12 h. The product was washed several times with deionized water and ethanol, and then dried in an oven at 60°C for 12 h to obtain Fe-g-C3N4 / MoO 3-x .

[0083] Photocatalyst prepared in Example 5, Fe-g-C3N4 / MoO 3-x The removal rate of humic acid by the / H2O2 system is as follows: Figure 1 As shown, when the photocatalyst dosage reaches 0.02 g / 50 mL and the H2O2 dosage is 2 mM, the removal rate of humic acid can reach 83.15%.

[0084] Example 6

[0085] A Fe-g-C3N4 / MoO 3-x The preparation method of photocatalyst includes the following steps:

[0086] a) Mix 30 mL of water and 4 g of melamine, and stir thoroughly for 40 min to obtain solution A;

[0087] b) Add 0.08 g of Fe(NO3)3·9H2O to solution A and sonicate for 30 min to obtain solution B;

[0088] c) Place solution B in an oven at 60°C for 24 hours to dry, and obtain solid C;

[0089] d) Place solid C in a crucible of appropriate size, put it in a muffle furnace and heat it in air at a rate of 5℃ / min, hold it at 550℃ for 2h, cool it to room temperature and grind it to obtain powder D (Fe-g-C3N4);

[0090] e) Mix ethanol and H2O2 at a volume ratio of 25:4.5 and stir thoroughly for 20 minutes to obtain solution E;

[0091] f) Add 0.1g of molybdenum powder to solution E to obtain solution F;

[0092] g) Add 0.4g of powder D to solution F to obtain mixed solution G;

[0093] h) The mixed liquid G was placed in a reaction vessel of suitable size and reacted solvothermally at 160°C for 12 h. The product was washed several times with deionized water and ethanol, and then dried in an oven at 60°C for 12 h to obtain Fe-g-C3N4 / MoO3-x .

[0094] Photocatalyst prepared in Example 6, Fe-g-C3N4 / MoO 3-x The removal rate of humic acid by the PMS system is as follows: Figure 2 As shown, when the photocatalyst dosage reaches 0.02 g / 50 mL and the PMS dosage is 1 mM, the removal rate of humic acid can reach 82.27%.

[0095] Example 7

[0096] A Fe-g-C3N4 / MoO 3-x The preparation method of photocatalyst includes the following steps:

[0097] a) Mix 30 mL of water and 4 g of melamine, and stir thoroughly for 40 min to obtain solution A;

[0098] b) Add 0.16g of Fe(NO3)3·9H2O to solution A and sonicate for 30min to obtain solution B;

[0099] c) Place solution B in an oven at 60°C for 24 hours to dry, and obtain solid C;

[0100] d) Place solid C in a crucible of appropriate size, put it in a muffle furnace and heat it in air at a rate of 5℃ / min, hold it at 550℃ for 2h, cool it to room temperature and grind it to obtain powder D (Fe-g-C3N4);

[0101] e) Mix ethanol and H2O2 at a volume ratio of 25:4.5 and stir thoroughly for 20 minutes to obtain solution E;

[0102] f) Add 0.1g of molybdenum powder to solution E to obtain solution F;

[0103] g) Add 0.4g of powder D to solution F to obtain mixed solution G;

[0104] h) The mixed liquid G was placed in a reaction vessel of suitable size and reacted solvothermally at 160°C for 12 h. The product was washed several times with deionized water and ethanol, and then dried in an oven at 60°C for 12 h to obtain Fe-g-C3N4 / MoO 3-x .

[0105] The photocatalyst prepared in Example 7, Fe-g-C3N4 / MoO 3-x The removal rate of humic acid by the PMS system is as follows: Figure 2 As shown, when the photocatalyst dosage reaches 0.02 g / 50 mL and the PMS dosage is 1 mM, the removal rate of humic acid can reach 92.52%.

[0106] Example 8

[0107] A Fe-g-C3N4 / MoO 3-x The preparation method of photocatalyst includes the following steps:

[0108] a) Mix 30 mL of water and 4 g of melamine, and stir thoroughly for 40 min to obtain solution A;

[0109] b) Add 0.32 g of Fe(NO3)3·9H2O to solution A and sonicate for 30 min to obtain solution B;

[0110] c) Place solution B in an oven at 60°C for 24 hours to dry, and obtain solid C;

[0111] d) Place solid C in a crucible of appropriate size, put it in a muffle furnace and heat it in air at a rate of 5℃ / min, hold it at 550℃ for 2h, cool it to room temperature and grind it to obtain powder D (Fe-g-C3N4);

[0112] e) Mix ethanol and H2O2 at a volume ratio of 25:4.5 and stir thoroughly for 20 minutes to obtain solution E;

[0113] f) Add 0.1g of molybdenum powder to solution E to obtain solution F;

[0114] g) Add 0.4g of powder D to solution F to obtain mixed solution G;

[0115] h) The mixed liquid G was placed in a reaction vessel of suitable size and reacted solvothermally at 160°C for 12 h. The product was washed several times with deionized water and ethanol, and then dried in an oven at 60°C for 12 h to obtain Fe-g-C3N4 / MoO 3-x .

[0116] Photocatalyst prepared in Example 8, Fe-g-C3N4 / MoO 3-x The removal rate of humic acid by the PMS system is as follows: Figure 2 As shown, when the photocatalyst dosage reaches 0.02 g / 50 mL and the PMS dosage is 1 mM, the removal rate of humic acid can reach 97.23%.

[0117] Depend on Figure 3 It can be seen that MoO 3-x Nanoparticles are uniformly grown on the Fe-g-C3N4 surface, and this structure can be used for MoO. 3-x The nanoparticles and Fe-g-C3N4 provide sufficient contact surface area, which is beneficial for the rapid separation of electron-hole pairs.

[0118] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made using the present invention specification, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A Fe- g -C3N4 / MoO 3-x The application of photocatalysts is characterized by, It is applied to the photo-Fenton oxidation to remove humic acid from water, wherein the Fe- g -C3N4 / MoO 3-x The preparation method of the photocatalyst includes the following steps: a) Dissolve the Fe source in an aqueous melamine solution, sonicate to homogenize, dry at 60–90°C for 12–24 h, place the resulting solid in a muffle furnace, heat to 500–550°C at a rate of 5°C / min, calcine for 2–4 h, cool to room temperature, and grind into powdered Fe- g -C3N4, wherein the concentration of the melamine aqueous solution is 8-12 wt%; the mass-to-volume ratio of Fe source to melamine aqueous solution is 0.04-0.08 g: 20-40 mL; b) Add molybdenum powder to a mixed solution of ethanol and H2O2 and stir until homogeneous. Then add powdered Fe- g -C3N4 was dispersed and mixed evenly, placed in a reaction vessel, sealed, and reacted solvothermally at 120-160℃ for 9-12 hours. After natural cooling to room temperature, it was washed several times with deionized water and ethanol, and dried at 60℃ for 12 hours to obtain Fe- g -C3N4 / MoO 3-x Among them, molybdenum powder, ethanol, H2O2 and powdered Fe- g The mass-to-volume ratio of -C3N4 is 0.02–0.1 g : 25 mL : 1–5 mL : 0.1–0.5 g.

2. The Fe- according to claim 1 g -C3N4 / MoO 3-x The application of photocatalysts is characterized by: The Fe source mentioned in step a) is Fe(NO3)3·9H2O or FeSO4·7H2O.

3. The Fe- according to claim 1 g -C3N4 / MoO 3-x The application of photocatalysts is characterized by: The Fe source mentioned in step a) is Fe(NO3)3·9H2O.

4. The Fe- according to claim 1 g -C3N4 / MoO 3-x The application of photocatalysts is characterized by: In step a), the Fe source is dissolved in an aqueous melamine solution, ultrasonically homogenized, and dried at 60°C for 24 hours. The resulting solid is placed in a muffle furnace and heated to 550°C at a rate of 5°C / min, held at that temperature for 2 hours, cooled to room temperature, and then ground into powdered Fe- g -C3N4.

5. The Fe- according to claim 1 g -C3N4 / MoO 3-x The application of photocatalysts is characterized by: The mass-to-volume ratio of the Fe source to the melamine aqueous solution in step a) is 0.08 g: 30 mL.

6. The Fe- according to claim 1 g -C3N4 / MoO 3-x The application of photocatalysts is characterized by: In step b), molybdenum powder is added to a mixed solution of ethanol and H2O2 and stirred until homogeneous. Then, powdered Fe- g -C3N4 was dispersed and mixed evenly, placed in a reaction vessel, sealed, and reacted at 160℃ for 12 hours using a solvothermal method, and then naturally cooled to room temperature.

7. The Fe- according to claim 1 g -C3N4 / MoO 3-x The application of photocatalysts is characterized by: The molybdenum powder, ethanol, H2O2 and powdered Fe- mentioned in step b) g The mass-to-volume ratio of -C3N4 is 0.1g: 25mL: 4mL: 0.4g.

8. The Fe- according to claim 1 g -C3N4 / MoO 3-x The application of photocatalysts is characterized by: The Fe- g -C3N4 / MoO 3-x The microstructure of the photocatalyst is Fe- g -C3N4 exhibits a blocky structure, MoO 3-x It is granular, MoO 3-x Nanoparticles grow uniformly on bulk Fe- g -C3N4 surface.

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