Fe and Mo loaded waste wind turbine blade catalyst, and preparation method and application thereof

Abstract

The application belongs to the technical field of solid waste treatment, and discloses a catalyst of abandoned wind power blade loaded with Fe and Mo as well as a preparation method and application thereof.The catalyst comprises the following steps: sequentially immersing the abandoned wind power blade in solution A and solution B to obtain the treated abandoned wind power blade; and sequentially drying and heat-treating the treated abandoned wind power blade to obtain the catalyst of abandoned wind power blade loaded with Fe and Mo.The material has excellent reusability, can be used for multiple times, and has basically unchanged catalytic efficiency.The material forms a porous carbon skeleton when carbonized at high temperature, which is beneficial to the deposition of Fe and Mo.The catalyst is used to catalyze the degradation of polycyclic organic pollutants such as tetracycline antibiotics in wastewater, and hydrogen peroxide is used to generate hydroxyl radicals, which is beneficial to green environmental protection.The material has magnetism and can be conveniently separated from the solution.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of solid waste treatment, and particularly relates to a catalyst for waste wind power blade loaded with Fe and Mo, and a preparation method and application thereof. BACKGROUND

[0002] With the continuous development of social economy and the continuous rise of energy consumption, problems such as fossil energy depletion and environmental pollution are becoming increasingly serious, thereby promoting the global energy structure adjustment, making renewable energy such as wind energy and solar energy gradually change from supplementary energy to alternative energy. Among them, wind energy, as an internationally recognized green renewable energy, has attracted much attention, and wind power generation, as a mature wind energy utilization scheme, has been widely used in large-scale commercial applications, and has strong market competitiveness in renewable energy power generation.

[0003] China has vast resources and rich wind power resources. Wind power generation plays an important role in energy structure adjustment and promoting regional economic development in China. The rapid development of wind power leads to a large-scale increase in the use frequency of wind turbine blade materials. According to statistics, the total amount of retired blades in China in 2018 was about 5700t, and it is predicted that 52000t of retired blades will be produced by 2025. Therefore, how to reasonably recycle and reuse them is a big problem faced by the current wind power field.

[0004] Traditional treatment methods include open-air stacking, landfilling or incineration. However, open-air stacking and landfilling occupy a large area of land, and the toxic substances separated out will further pollute the soil, groundwater system, etc. Direct incineration treatment will produce a large amount of heat, toxic gas and smoke.

[0005] Current recycling technologies for waste blades mainly include mechanical recycling method and chemical recycling method. The mechanical recycling method is a method of secondary utilization with the pulverized waste composite material as raw material. For large composite materials such as wind power blades, the volume is large, and pre-cutting must be performed before pulverization. This recycling technology has low cost and simple process, and is widely used in the recycling of fiber reinforced polymer composites. However, most of the recycled products obtained by this method have very low value, and the fibers are severely damaged during the recycling process, and long fibers cannot be obtained. The chemical recycling method is to convert the resin matrix of the composite material into small molecules by using chemical reagents, so as to recycle the fibers. However, this recycling method has problems such as great difficulty and high cost for recycling thermosetting composite materials.

[0006] Fenton technology is an advanced oxidation technology (AOPs) that has become increasingly important due to its potential effectiveness in treating organic pollutants, especially biorefractory pollutants. Fenton technology, as an environmentally friendly and low-cost oxidation method, has its unique advantages, including high degradation efficiency, simple operation, and mild reaction conditions, and there is no report on the technology of applying waste wind power blades to Fenton technology as catalysts.

[0007] Therefore, it is of great significance to study a preparation method of a low-cost and simple-process Fe and Mo loaded waste wind power blade catalyst and the application of the prepared catalyst in Fenton technology. SUMMARY

[0008] Therefore, the application provides a Fe and Mo loaded waste wind power blade catalyst and a preparation method and application thereof, and aims to solve the technical problems of high cost and great difficulty in the existing waste wind power blade recycling process.

[0009] In order to achieve the above-mentioned purpose, the application adopts the following technical solutions:

[0010] The application provides a preparation method of a Fe and Mo loaded waste wind power blade catalyst, which comprises the following steps:

[0011] (1) sequentially immersing the waste wind power blade in solution A and solution B to obtain a treated waste wind power blade;

[0012] (2) sequentially drying and heat-treating the obtained treated waste wind power blade to obtain a Fe and Mo loaded waste wind power blade catalyst;

[0013] In the solution A, chitosan, acetic acid and water are included.

[0014] Preferably, in the solution A, the mass ratio of chitosan, acetic acid and water is 0.5-3:0.5-3:100.

[0015] Preferably, in the solution B, the molar ratio of ferrous sulfate heptahydrate to ammonium molybdate tetrahydrate is 15-20:0.8-1.6, and the concentration of ferrous sulfate heptahydrate is 0.5-2 mol / L.

[0016] Preferably, in the step (1), the immersion is carried out under stirring, and the stirring speed is independently 800-1000 rpm.

[0017] Preferably, in the step (1), the immersion time in the solution A is 100-150 min, and the immersion time in the solution B is 100-150 min. Preferably, in the step (1), the immersion time in the solution A is 100-150 min, and the immersion time in the solution B is 100-150 min.

[0018] Preferably, in the step (2), the drying time is 10-12h, and the drying temperature is 50-60℃.

[0019] Preferably, in the step (2), the heat treatment is carried out under a protective atmosphere, the heat treatment temperature is 800-1000℃, the heat treatment time is 1.5-2.5h, and the heating rate from the drying temperature to the heat treatment temperature is 8.5-12℃ / min.

[0020] The application further provides the Fe and Mo loaded waste wind power blade catalyst prepared by the preparation method of the Fe and Mo loaded waste wind power blade catalyst.

[0021] The application further provides application of the Fe and Mo loaded waste wind power blade catalyst in wastewater treatment.

[0022] Via the technical solution, compared with the prior art, the application has the following beneficial effects:

[0023] (1) The chitosan solution soaking can significantly improve the adsorption amount of metal ions.

[0024] (2) The material is carbonized at high temperature to form a porous carbon skeleton, which is beneficial to Fe and Mo deposition.

[0025] (3) The catalyst is introduced with magnetism, which is beneficial to Fenton reaction of iron ions and hydrogen peroxide, and the material can be separated from the solution very conveniently.

[0026] (4) The material has excellent reusability, can be used for multiple times, and the catalytic efficiency is basically unchanged.

[0027] (5) The catalyst is used to catalyze degradation of tetracycline antibiotics and other polycyclic organic pollutants in wastewater, and hydrogen peroxide is used to generate hydroxyl radicals, which is beneficial to green environmental protection. BRIEF DESCRIPTION OF DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are only the embodiments of the application, and for those skilled in the art, other drawings can be obtained without creative labor based on the provided drawings.

[0029] Figure 1 The flowchart of the application is shown in the figure;

[0030] Figure 2XRD patterns of the Fe and Mo loaded waste wind turbine blade catalysts obtained in Examples 1-3 and the waste wind turbine blade catalyst obtained in Comparative Example 1;

[0031] Figure 3 SEM images of the Fe and Mo loaded waste wind turbine blade catalyst obtained in Example 1, wherein the magnification of a is 1 μm, the magnification of b is 5 μm, and the magnification of c is 10 μm;

[0032] Figure 4 SEM images of the Fe loaded waste wind turbine blade catalyst obtained in Comparative Example 2, wherein the magnification of a is 1 μm, the magnification of b is 5 μm, and the magnification of c is 10 μm;

[0033] Figure 5 UV-vis spectra of the Fe and Mo loaded waste wind turbine blade catalyst obtained in Example 1 in the process of catalyzing the degradation of tetracycline solution at different time intervals;

[0034] Figure 6 Degradation efficiency of tetracycline by the Fe and Mo loaded waste wind turbine blade catalysts obtained in Examples 1-3 in H2O2-based systems;

[0035] Figure 7 Reusability of the Fe and Mo loaded waste wind turbine blade catalyst obtained in Example 1;

[0036] Figure 8 Fe and Mo leaching amount of the Fe and Mo loaded waste wind turbine blade catalyst obtained in Example 1 in the process of use;

[0037] Figure 9 Removal efficiency of various antibiotics by the Fe and Mo loaded waste wind turbine blade catalyst obtained in Example 1 under the action of H2O2. DETAILED DESCRIPTION

[0038] The present application provides a preparation method of a Fe and Mo loaded waste wind turbine blade catalyst, comprising the following steps:

[0039] (1) sequentially immersing the waste wind turbine blade in solution A and solution B to obtain a treated waste wind turbine blade;

[0040] (2) sequentially drying and heat-treating the obtained treated waste wind turbine blade to obtain a Fe and Mo loaded waste wind turbine blade catalyst;

[0041] wherein solution A comprises chitosan, acetic acid and water; and solution B comprises ferrous sulfate heptahydrate, ammonium molybdate tetrahydrate and water.

[0042] Preferably, the waste wind power blade has a size of 1 cm*1 cm*1 cm.

[0043] Preferably, the mass ratio of chitosan, acetic acid and water in the solution A is 0.5-3:0.5-3:100, further preferably 1-2.5:1-2.5:100, and more preferably 1.5-2:1.5-2:100.

[0044] In the present application, the acetic acid is used to help chitosan dissolve.

[0045] Preferably, the molar ratio of ferrous sulfate heptahydrate to ammonium molybdate tetrahydrate in the solution B is 15-20:0.8-1.6, further preferably 16-19:1-1.4, and more preferably 17-18:1.2-1.3, and the concentration of ferrous sulfate heptahydrate is preferably 0.5-2 mol / L, further preferably 1-1.8 mol / L, and more preferably 1.2-1.5 mol / L.

[0046] In the step (1), the soaking is preferably carried out under stirring, and the stirring speed is independently preferably 800-1000 rpm, further preferably 850-950 rpm, and more preferably 880-900 rpm.

[0047] In the step (1), the soaking time in the solution A is preferably 100-150 min, further preferably 110-140 min, and more preferably 120-130 min, and the soaking time in the solution B is preferably 100-150 min, further preferably 110-140 min, and more preferably 120-130 min.

[0048] In the step (2), the drying time is preferably 10-12 h, further preferably 10.5-11.5 h, and more preferably 11 h, and the drying temperature is preferably 50-60℃, further preferably 52-58℃, and more preferably 55-56℃.

[0049] In the step (2), the heat treatment is preferably carried out in a protective atmosphere, and the protective atmosphere is preferably nitrogen or helium, the heat treatment temperature is preferably 800-1000℃, further preferably 850-950℃, and more preferably 880-900℃, the heat treatment time is preferably 1.5-2.5 h, further preferably 2 h, and the heating rate from the drying temperature to the heat treatment temperature is preferably 8.5-12℃ / min, further preferably 9-11.5℃ / min, and more preferably 9.5-10℃ / min.

[0050] The application further provides a preparation method of the Fe and Mo loaded waste wind power blade catalyst.

[0051] The application further provides application of the Fe and Mo loaded waste wind power blade catalyst in wastewater treatment.

[0052] The technical solutions provided by the application are described in detail below in combination with examples, but they should not be understood as limitations to the protection scope of the application.

[0053] Example 1

[0054] The waste wind power blade is cut into small cubes with a length, width and height of 1 cm*1 cm*1 cm;

[0055] Chitosan, acetic acid and water with a mass ratio of 1:1:100 are mixed to obtain solution A; FeSO4*7H2O and (NH4)6Mo7O 24 *4H2O with an atomic ratio of Fe:Mo=2.5:1 are mixed with water to prepare a solution, wherein the concentration of FeSO4*7H2O is 1 mol / L, to obtain solution B;

[0056] The small cubes are appropriately placed in a three-necked flask, solution A is poured into the three-necked flask, and stirring is performed at a speed of 1000 rpm for 2 h; after the solution is poured out, solution B is poured into the three-necked flask, and stirring is performed at a speed of 1000 rpm for 2 h, and then the small cubes are taken out, to obtain the treated waste wind power blade;

[0057] The treated waste wind power blade is dried at a temperature of 60 for 12 min, and then is placed in a tube furnace, and is heated to 900 DEG C at a heating rate of 10 DEG C / min under an N2 atmosphere, and is burned for 2 hours, and then is naturally cooled, to obtain the Fe and Mo loaded waste wind power blade catalyst, which is recorded as "Fe-Mo / PVC-900".

[0058] Example 2

[0059] The waste wind power blade is cut into small cubes with a length, width and height of 1 cm*1 cm*1 cm;

[0060] Chitosan, acetic acid and water with a mass ratio of 1:1:100 are mixed to obtain solution A; FeSO4*7H2O and (NH4)6Mo7O 24 *4H2O with an atomic ratio of Fe:Mo=2.5:1 are mixed with water to prepare a solution, wherein the concentration of FeSO4*7H2O is 1 mol / L, to obtain solution B;

[0061] Put the small cubes into a three-necked flask, pour in solution A, and stir at a speed of 1000 rpm for 2 h; after pouring out the solution, pour solution B into the three-necked flask, and stir at a speed of 1000 rpm for 2 h, and then take out the small cubes to obtain the treated waste wind power blade;

[0062] Dry the treated waste wind power blade at a temperature of 60°C for 12 h, and then put it into a tube furnace, and raise the temperature to 700°C at a temperature raising speed of 10°C / min under a N2 atmosphere, and burn for 2 h, and then cool naturally to obtain a waste wind power blade catalyst loaded with Fe and Mo, which is recorded as "Fe-Mo / PVC-700".

[0063] Example 3

[0064] Cut the waste wind power blade into small cubes with a length, width and height of 1 cm x 1 cm x 1 cm;

[0065] Mix chitosan, acetic acid and water in a mass ratio of 1:1:100 to obtain solution A; mix FeSO4·7H2O and (NH4)6Mo7O 24 ·4H2O with an atomic ratio of Fe:Mo = 2.5:1 with water to prepare a solution, wherein the concentration of FeSO4·7H2O is 1 mol / L to obtain solution B;

[0066] Put the small cubes into a three-necked flask, pour in solution A, and stir at a speed of 1000 rpm for 2 h; after pouring out the solution, pour solution B into the three-necked flask, and stir at a speed of 1000 rpm for 2 h, and then take out the small cubes to obtain the treated waste wind power blade;

[0067] Dry the treated waste wind power blade at a temperature of 60°C for 12 h, and then put it into a tube furnace, and raise the temperature to 500°C at a temperature raising speed of 10°C / min under a N2 atmosphere, and burn for 2 h, and then cool naturally to obtain a waste wind power blade catalyst loaded with Fe and Mo, which is recorded as "Fe-Mo / PVC-500".

[0068] Comparative Example 1

[0069] Cut the waste wind power blade into small cubes with a length, width and height of 1 cm x 1 cm x 1 cm;

[0070] Mix chitosan, acetic acid and water in a mass ratio of 1:1:100 to obtain solution A;

[0071] Put the small cubes into a three-necked flask, pour in solution A, and stir at a speed of 1000 rpm for 2 h, and then take out the small cubes to obtain the treated waste wind power blade;

[0072] The treated waste wind power blade was dried at a temperature of 60°C for 12 h, and then was placed in a tube furnace, and was burned at 900°C under N2atmosphere at a temperature rising rate of 10°C / min for 2 h, and then was naturally cooled to obtain a waste wind power blade catalyst, which was recorded as "PVC-900".

[0073] Comparative Example 2

[0074] The waste wind power blade was cut into small cubes with a length, width and height of 1 cm x 1 cm x 1 cm;

[0075] Chitosan, acetic acid and water were mixed in a mass ratio of 1:1:100 to obtain solution A; FeSO4·7H2O was mixed with water to obtain solution B with a concentration of 1 mol / L of FeSO4·7H2O;

[0076] The small cubes were placed in a three-necked flask, solution A was poured in, and stirring was carried out at a speed of 1000 rpm for 2 h, then solution B was poured into the three-necked flask, and stirring was carried out at a speed of 1000 rpm for 2 h, and then the small cubes were taken out to obtain the treated waste wind power blade;

[0077] The treated waste wind power blade was dried at a temperature of 60°C for 12 h, and then was placed in a tube furnace, and was burned at 900°C under N2atmosphere at a temperature rising rate of 10°C / min for 2 h, and then was naturally cooled to obtain a waste wind power blade catalyst, which was recorded as "PVC-900".

[0078] Performance detection

[0079] 1. Degradation time

[0080] 0.18 g of Fe-Mo / PVC-900 obtained in Example 1 was added to 60 mL of tetracycline-containing wastewater with a concentration of 20 mg / L, and 6.7 mL of H2O2 with a concentration of 10 mmol / L was added, and after the addition of H2O2 was completed, the concentration of residual tetracycline in the solution was determined by ultraviolet spectrophotometry at reaction times of 0 min, 3 min, 5 min, 10 min, 15 min, 25 min, 40 min, 60 min, 90 min and 120 min, respectively, and the test results are shown in Figure 5 .

[0081] The UV-vis spectra of the Fe and Mo loaded waste wind power blade catalyst obtained in Example 1 in the process of catalytic degradation of tetracycline solution at different time intervals are shown in Figure 5 . Figure 5 As can be seen from the above, at the two main absorption characteristic peaks of 358 nm and 275 nm, the peaks gradually disappeared with the prolongation of the reaction time, and it can be seen that the tetracycline in the wastewater was fully degraded.

[0082] 2. Degradation efficiency

[0083] Four groups of 60 ml of tetracycline concentration of 20 mg / L wastewater were taken, and 6.7 mL of 10 mmol / L H2O2, 6.7 mL of 10 mmol / L H2O2 and 0.18 g of Fe-Mo / PVC-900, 6.7 mL of 10 mmol / L H2O2 and 0.18 g of Fe-Mo / PVC-700, 6.7 mL of 10 mmol / L H2O2 and 0.18 g of Fe-Mo / PVC-500 were added to the four groups of wastewater, respectively, and the residual tetracycline concentration in the solution was determined by ultraviolet spectrophotometer at 0 min, 3 min, 5 min, 10 min, 15 min, 25 min, 40 min, 60 min, 90 min and 120 min, respectively. The test results are shown in Figure 6 .

[0084] The degradation efficiency of the Fe and Mo loaded waste wind turbine blade catalysts obtained in Examples 1-3 on tetracycline in the H2O2-based system is shown in Figure 6 . It can be seen from Figure 6 that when only H2O2 exists in the wastewater, the degradation efficiency of tetracycline is less than 5% within 30 min, after adding Fe-Mo / PVC-500 and Fe-Mo / PVC-700 in the catalytic system, the degradation efficiency of tetracycline within 30 min reaches 23% and 42%, respectively, and after adding Fe-Mo / PVC-900 in the catalytic system, the degradation efficiency of tetracycline within 30 min can reach more than 85%.

[0085] 3. Reuse performance

[0086] 0.18 g of Fe-Mo / PVC-900 obtained in Example 1 was added to 60 mL of tetracycline-containing wastewater with a concentration of 20 mg / L, and 6.7 mL of 10 mmol / L H2O2 was added, after the addition of H2O2 was completed, the residual tetracycline concentration in the solution was determined by ultraviolet spectrophotometer after 2 h of reaction, and then the ordinary magnet was added to the wastewater after degradation to separate Fe-Mo / PVC-900 from the wastewater;

[0087] The separated Fe-Mo / PVC-900 was repeatedly used as described above, and the Figure 7 was obtained. The reuse performance of the Fe and Mo loaded waste wind turbine blade catalyst obtained in Example 1 is shown in Figure 7 . It can be seen from Figure 7 that after the Fe-Mo / PVC-900 catalyst was used for ten cycles in succession, the removal rate of tetracycline could still reach more than 87%.

[0088] 4. Fe and Mo leaching amount

[0089] (1) Fe leaching amount

[0090] Take 15 mL of wastewater degraded after 1-10 cycles of repeated use performance test respectively to obtain ten groups of samples, add 5 mL of buffer solution (164 g of sodium acetate is dissolved in water, 84 mL of acetic acid is added, and the solution is diluted to 1000 mL), 1 mL of 20 g / L ascorbic acid solution, 1 mL of 2 g / L 1,10-phenanthroline solution, and one drop of 10-fold diluted hydrochloric acid solution for adjusting PH value to the ten groups of samples respectively, and then measure the Fe content in the ten groups of samples respectively by ultraviolet spectrophotometer after 20 min of reaction.

[0091] (2) Mo leaching amount

[0092] Take 20 mL of wastewater degraded after 1-10 cycles of repeated use performance test respectively to obtain ten groups of samples, add 3 mL of 1+1 H2SO4 solution diluted with water to 30 mL, 1 mL of 1.2570 g / L copper sulfate solution, 3 mL of 100 g / L ascorbic acid solution, 8 mL of 250 g / L potassium thiocyanate solution to the ten groups of samples respectively, and then add water to 50 mL, and then measure the Mo content in the ten groups of samples respectively by ultraviolet spectrophotometer after 20 min of reaction.

[0093] The Fe and Mo leaching amount spectrum of the Fe and Mo loaded waste wind power blade catalyst obtained in Example 1 during use is shown in Figure 8 It can be seen from Figure 8 that the Fe and Mo ion leaching amount of Fe-Mo / PVC-900 gradually decreases after ten times of repeated use, the Mo ion leaching amount is less than 0.03 mg / L after 5 times of repeated use, and the Fe ion leaching amount is less than 0.025 mg / L after 10 times of repeated use.

[0094] 5. Removal efficiency of various antibiotics

[0095] Add 0.18 g of Fe-Mo / PVC-900 obtained in Example 1 to 60 mL of wastewater containing tetracycline (TC) with a concentration of 20 mg / L, 60 mL of wastewater containing oxytetracycline (OTC) with a concentration of 20 mg / L, 60 mL of wastewater containing ciprofloxacin (CIP) with a concentration of 20 mg / L, and 60 mL of wastewater containing norfloxacin (FPA) with a concentration of 20 mg / L respectively, and add 6.7 mL of H2O2 with a concentration of 10 mmol / L respectively, and then measure the residual tetracycline, oxytetracycline, ciprofloxacin, and norfloxacin concentrations in the solution by ultraviolet spectrophotometer after 120 min of reaction, and the test results are shown in Figure 9 .

[0096] The removal efficiency map of various antibiotics by the Fe and Mo loaded waste wind power blade catalyst of Example 1 under the action of H2O2 is shown in Table 1. Figure 9 Figure 9 It can be seen that the removal rates of Fe-Mo / PVC-900 catalyst under the action of H2O2 on tetracycline, oxytetracycline, ciprofloxacin and norfloxacin can reach 94.00%, 90.00%, 84.71% and 91.00%, respectively.

[0097] The above only describes the preferred embodiments of the present application, and it should be noted that for those skilled in the art, without departing from the principles of the present application, several improvements and refinements can also be made, which should be considered as the protection scope of the present application.​

Claims

1. A process for the preparation of a spent windmill blade catalyst loaded with Fe and Mo, characterized in that, The method comprises the following steps: (1) sequentially immersing the waste wind power blade in solution A and solution B to obtain a treated waste wind power blade; (2) sequentially drying and heat-treating the treated waste wind power blade to obtain a waste wind power blade catalyst loaded with Fe and Mo; wherein solution A comprises chitosan, acetic acid and water; and solution B comprises ferrous sulfate heptahydrate, ammonium molybdate tetrahydrate and water; in the step (2), the heat treatment is performed under a protective atmosphere, the temperature of the heat treatment is 800-1000℃, the time of the heat treatment is 1.5-2.5h, and the heating rate from the drying temperature to the heat treatment temperature is 8.5-12℃ / min.

2. A process for the preparation of a Fe and Mo supported spent wind turbine blade catalyst according to claim 1, characterized in that, in the solution A, the mass ratio of chitosan, acetic acid and water is 0.5-3:0.5-3:

100.

3. A process for the preparation of a Fe and Mo supported spent wind turbine blade catalyst according to claim 2, characterized in that, in the solution B, the molar ratio of ferrous sulfate heptahydrate to ammonium molybdate tetrahydrate is 15-20:0.8-1.6, and the concentration of ferrous sulfate heptahydrate is 0.5-2mol / L.

4. A process for the preparation of a Fe and Mo supported spent wind turbine blade catalyst according to claim 2 or 3, characterized in that, in the step (1), the immersion is performed under stirring, and the stirring speed is independently 800-1000rpm.

5. The method for preparing a Fe and Mo supported waste wind turbine blade catalyst according to claim 4, characterized in that, in the step (1), the immersion time in the solution A is 100-150min, and the immersion time in the solution B is 100-150min.

6. The method for preparing a Fe and Mo supported waste wind turbine blade catalyst according to claim 5, characterized by, in the step (2), the drying time is 10-12h, and the drying temperature is 50-60℃.

7. A waste wind power blade catalyst loaded with Fe and Mo prepared by the method of any one of claims 1-6.

8. The application of the waste wind power blade catalyst loaded with Fe and Mo of claim 7 in wastewater treatment.

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