Iron-modified molybdenum disulfide-based piezoelectric catalytic material, preparation method and application thereof
By modifying the surface of molybdenum disulfide with iron, Fe-MoS2 materials were prepared. Combined with a Fenton-like reaction, the problem of insufficient hydrogen peroxide utilization was solved, and the efficient degradation of norfloxacin was achieved, which is suitable for the removal of antibiotics in water.
Patent Information
- Application Number
- CN202411664746.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-20
- Publication Date
- 2025-12-16
- Estimated Expiration
- 2044-11-20
AI Technical Summary
In existing piezoelectric catalytic systems, the hydrogen peroxide generated by molybdenum disulfide is not effectively utilized, resulting in poor catalytic performance. Furthermore, traditional methods are inefficient in removing antibiotics such as norfloxacin from water, requiring additional chemical reagents or relying on fixed reaction conditions.
Fe-MoS2 materials were prepared by modifying the surface of molybdenum disulfide with iron. Under ultrasonication, combined with a Fenton-like reaction, hydrogen peroxide was effectively utilized to achieve efficient degradation of pollutants.
It achieves a 95.7% removal rate of norfloxacin within 15 minutes, with a fast degradation rate, low cost, and suitability for large-scale applications.
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Figure CN119500192B_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application belongs to the technical field of electrocatalytic materials, and particularly relates to a ferrous modified molybdenum disulfide-based piezocatalytic material, a preparation method thereof and an application thereof. BACKGROUND
[0002] The statements herein are provided only to enhance understanding of the present application and are not necessarily intended to constitute the prior art.
[0003] The removal of emerging pollutants in the environment has recently received extensive attention. Antibiotics are widely used in all production and life of human beings. Antibiotics that are not metabolized by organisms and residual antibiotics enter water and have become a new type of pollutant affecting water quality. Among them, fluoroquinolone antibiotics have good antibacterial effect, but have long residual time and are not easy to degrade, resulting in a large accumulation in water and transformation into toxic substances, posing a serious threat to the earth. Norfloxacin is a third-generation drug of fluoroquinolone antibiotics and is a broad-spectrum antibacterial drug, which has been widely used to treat many infections caused by antibiotic-resistant bacteria. In order to remove residual norfloxacin in the water environment, common treatment methods include biological methods, physical techniques and chemical methods. However, these traditional technologies still have certain shortcomings, such as poor removal of pollutants, the need to add additional chemical agents, or dependence on fixed reaction conditions. Therefore, it is essential to develop new and effective methods to eliminate antibiotics in aquatic environments.
[0004] The piezoelectric effect is actually a physical phenomenon. The crystal structure of a piezoelectric material with an internal polarization field deforms when subjected to an applied external stress, and surface charge separation and piezoelectric potential are generated, thereby generating an internal electric field in the material. The piezoelectric potential generated by the external force enhances the separation of free carriers, promoting the chemical reaction process. This phenomenon is called piezocatalysis, i.e. the conversion of mechanical energy into chemical energy. Piezocatalytic degradation refers to the spontaneous polarization and piezoelectric potential generated by piezoelectric nanomaterials when mechanical stress (such as stirring or ultrasonic vibration) is applied, which drives the carriers in the piezoelectric nanomaterials to move in the opposite direction, reacts with adsorbed water and oxygen to form active oxygen species, and then mineralizes and decomposes organic pollutants through redox reactions.
[0005] Compared with common three-dimensional piezoelectric materials such as zinc oxide and barium titanate, two-dimensional layered nanomaterials are more ideal, have an ultrathin layered structure, are easier to deform, and can withstand large strain. It is theoretically verified that the piezoelectric performance of two-dimensional transition metal sulfides is high, and it is found in experimental research that they have a high piezoelectric coefficient. Molybdenum disulfide is widely used in catalytic degradation of pollutants due to its rich reserves, direct preparation method, high chemical stability and diverse physicochemical properties. Using molybdenum disulfide as a piezoelectric catalyst can generate hydrogen peroxide in situ during the catalytic reaction process. However, the hydrogen peroxide generated in the piezoelectric catalytic system is not effectively utilized, resulting in resource waste and ineffective catalytic effect of the piezoelectric catalytic system. SUMMARY
[0006] In view of the deficiencies in the prior art, the purpose of the present application is to provide a Fe-modified molybdenum disulfide-based piezoelectric catalytic material and a preparation method and application thereof.
[0007] In order to achieve the above-mentioned purpose, the present application is realized by the following technical solutions:
[0008] In a first aspect, the present application provides a preparation method of a Fe-modified molybdenum disulfide-based piezoelectric catalytic material, comprising the following steps:
[0009] Mixing ammonium molybdate and thiourea with water in a certain proportion, and then carrying out hydrothermal reaction on the mixed solution;
[0010] Drying the solution after hydrothermal reaction to obtain molybdenum disulfide;
[0011] Mixing the molybdenum disulfide with a trivalent iron salt solution, stirring, and then adding a reducing agent for reduction;
[0012] Collecting and drying the reduced solution to obtain the Fe-modified molybdenum disulfide-based piezoelectric catalytic material.
[0013] The present application uses exogenous metal element ferrous ion to modify molybdenum disulfide, and the prepared Fe-MoS2 has more sensitive intrinsic piezoelectric properties. In the catalytic degradation process, molybdenum disulfide as a piezoelectric catalyst can generate hydrogen peroxide in situ during the catalytic reaction process. Since Fe or Mo ions quickly react and consume the in-situ generated hydrogen peroxide, a Fenton-like reaction is carried out, the generated hydrogen peroxide is effectively utilized, and the pollutants are better removed.
[0014] In some embodiments, the molar ratio of ammonium molybdate to thiourea is 1.5-2.5:30-60.
[0015] Preferably, the molar ratio of ammonium molybdate to thiourea is 2:50.
[0016] In some embodiments, the temperature of the hydrothermal reaction is 180-220℃, and the time of the hydrothermal reaction is 20-30h.
[0017] Preferably, the temperature of the hydrothermal reaction is 200℃, and the time of the hydrothermal reaction is 24h.
[0018] In some embodiments, the method further comprises the step of washing the dried molybdenum disulfide with water and anhydrous ethanol.
[0019] Preferably, the method further comprises the step of drying the washed molybdenum disulfide.
[0020] In some embodiments, the molar ratio of molybdenum disulfide to ferric iron is 1:0.15-1.05.
[0021] In some embodiments, the mixing time of the molybdenum disulfide and the ferric iron salt solution is 20-30h. The mixing time is relatively long to ensure that the iron ions are adsorbed on the surface of the molybdenum disulfide.
[0022] In some embodiments, the reducing agent is sodium borohydride, stannous chloride or potassium borohydride.
[0023] Preferably, the molar ratio of ferric iron to sodium borohydride is 1:5. Sodium borohydride is added in excess to ensure complete reduction.
[0024] Preferably, after the reducing agent is added, the reaction is stirred for 1h.
[0025] In some embodiments, the method further comprises the step of washing the prepared iron-modified molybdenum disulfide-based piezoelectric catalytic material with water and anhydrous ethanol.
[0026] In a second aspect, the present application provides an iron-modified molybdenum disulfide-based piezoelectric catalytic material prepared by the preparation method.
[0027] In a third aspect, the present application provides the use of the iron-modified molybdenum disulfide-based piezoelectric catalytic material in the electrocatalytic degradation of organic pollutants.
[0028] In some embodiments, the organic pollutant is norfloxacin.
[0029] In a fourth aspect, the present application provides a method for the piezoelectric catalytic degradation of norfloxacin, comprising the steps of: placing the iron-modified molybdenum disulfide-based piezoelectric catalytic material in wastewater to be degraded, applying ultrasound, and degrading.
[0030] In some embodiments, the frequency of the applied ultrasound is 20hKz, and the power is 90W.
[0031] The beneficial effects achieved by one or more embodiments of the present application are as follows:
[0032] The present application proposes to couple the piezocatalysis and Fenton-like reaction, effectively utilizes the hydrogen peroxide which may be generated in situ in the process of piezocatalytic degradation of pollutants, through post-modification means, doping iron element on the surface of molybdenum disulfide, and preparing a kind of iron modified molybdenum disulfide based piezocatalytic material, and under the action of ultrasonic induction, using the catalyst material, degrading antibiotic norfloxacin, and realizing 95.7% removal rate within 15 minutes (93.2% at 5 minutes).
[0033] The present application has simple preparation process, does not need expensive equipment, has high preparation yield, uses low power and frequency in the ultrasonic action stage, has low energy consumption, and has low economic cost, and has bright prospects in the large-scale application of piezocatalytic degradation of pollutants in the future. BRIEF DESCRIPTION OF DRAWINGS
[0034] The drawings accompanying the specification of the present application serve to provide further understanding of the present application, and the illustrative embodiments of the present application and the description thereof serve to explain the present application, and do not constitute improper limitation on the present application.
[0035] Figure 1 is the SEM diagram of the iron modified molybdenum disulfide catalyst material obtained in example 1;
[0036] Figure 2 is the TEM diagram (a) and element distribution diagram (b) of the composite catalyst material of the iron modified molybdenum disulfide catalyst material obtained in example 1, which has obvious thin layer nanoflower and uniform distribution of each element;
[0037] Figure 3 is the PFM test diagram (b) of the composite catalyst material of the iron modified molybdenum disulfide catalyst material obtained in example 1, and the composite catalyst has higher intrinsic piezoelectric response compared with the control material (a);
[0038] Figure 4 is the specific surface area (a) and pore size distribution diagram (b) of the composite catalyst material of the iron modified molybdenum disulfide catalyst material obtained in example 1;
[0039] Figure 5 is the performance diagram of the piezoelectric degradation of antibiotic norfloxacin of the iron modified molybdenum disulfide catalyst material obtained in example 1 under the action of ultrasonic;
[0040] Figure 6 is the performance diagram of the piezoelectric catalytic degradation of norfloxacin of the iron modified molybdenum disulfide catalyst material obtained in example 1 under the action of ultrasonic, under different catalyst dosages.
[0041] Figure 7 is the performance diagram of the piezoelectric catalytic degradation of norfloxacin of the iron modified molybdenum disulfide catalyst material obtained in example 1 under the action of ultrasonic, under different ultrasonic power.
[0042] Figure 8 is a performance chart of the iron-modified molybdenum disulfide catalytic material obtained in Example 1 under the action of ultrasound and different substrate concentrations in piezocatalytic degradation of norfloxacin.
[0043] Figure 9 is a performance chart of the iron-modified molybdenum disulfide catalytic material obtained in Examples 2-4 under the action of ultrasound in piezocatalytic degradation of norfloxacin.
[0044] Figure 10 is a test chart of the transition metal-modified molybdenum disulfide catalytic material obtained in Example 1 and Comparative Examples 1-4 under the action of ultrasound in the piezocatalytic process to produce hydrogen peroxide. DETAILED DESCRIPTION
[0045] It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the present application. Unless otherwise indicated, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
[0046] The present application will be further described below in conjunction with examples.
[0047] Example 1
[0048] (NH4)2MoO4(2 mmol) and thiourea (50 mmol) were added to water and stirred for about 10 min for dissolution to obtain a mixed solution;
[0049] The mixed solution was transferred to a 100 ml autoclave and hydrothermally reacted at 200°C for 24 hours;
[0050] After the reaction was completed, the solution in the reaction kettle was cooled, solid-liquid separation was performed, the solid was washed with water 3 times and then with anhydrous ethanol 3 times, and then the solid was dried in a vacuum oven for 12 h to obtain MoS2;
[0051] The dried molybdenum disulfide was dispersed in 160 ml of a 6.25 mmol / L iron nitrate solution, and after being stirred for 24 hours, 0.378 g of sodium borohydride was added and stirred for 1 h for reduction reaction;
[0052] After the reduction reaction was completed, the solution after the reaction was vacuum dried to obtain the iron-modified molybdenum disulfide piezocatalytic material.
[0053] The iron-modified molybdenum disulfide material prepared was subjected to piezoelectric effect testing, and the piezocatalytic degradation performance of the composite material for pollutants was tested by taking an antibiotic as the target pollutant.
[0054] The morphology of Fe-MoS2 was tested by scanning electron microscopy (SEM), and it was observed that the modified material had a nano-flower morphology with a small size, and specific details can be seen in Figure 1 .
[0055] It can be found from the transmission electron microscopy (TEM) test figure that Fe-MoS2 has a thin layer nanoflower structure, and the iron element is uniformly distributed on the MoS2 substrate, which proves the successful preparation of the modified material, which can be seen in detail from Figure 2 .
[0056] By modifying MoS2 with iron, the specific surface area and pore size of Fe-MoS2 are controlled, that is, the specific surface area is increased and the pore size is reduced, which promotes the improvement of the catalytic reaction, which can be seen in detail from Figure 4 .
[0057] In order to further study the piezoelectric properties of the synthesized material at the nanoscale, the unmodified MoS2 and Fe-MoS2 were tested by piezoelectric force microscopy (PFM) technology. The piezoelectric amplitude curve shows that the local deformation of Fe-MoS2 is significantly greater than that of MoS2, and the d33 value of Fe-MoS2 is 10 times higher than that of MoS2. The results show that Fe-MoS2 has more sensitive intrinsic piezoelectric properties, which can be seen in detail from Figure 3 .
[0058] Example 2
[0059] (NH4)2MoO4 (2 mmol) and thiourea (50 mmol) were added to water and stirred for about 10 min for dissolution to obtain a mixed solution;
[0060] The mixed solution was transferred to a 100 ml autoclave and hydrothermally reacted at 200°C for 24 hours;
[0061] After the reaction was completed, the solution in the reaction kettle was cooled, solid-liquid separation was performed, the solid was washed with water for 3 times, then washed with anhydrous ethanol for 3 times, and then the solid was dried in a vacuum oven for 10 h to obtain MoS2;
[0062] The dried MoS2 was dispersed in 160 ml of 8.75 mmol / L iron nitrate solution, and after stirring for 20 hours, 0.529 g of sodium borohydride was added and stirred for 1 h for reduction reaction;
[0063] After the reduction reaction was completed, the solution after the reaction was vacuum dried to obtain the iron-modified MoS2 piezoelectric catalytic material.
[0064] Example 3
[0065] (NH4)2MoO4 (2 mmol) and thiourea (50 mmol) were added to water and stirred for about 10 min for dissolution to obtain a mixed solution;
[0066] The mixed solution was transferred to a 100 ml autoclave and hydrothermally reacted at 200°C for 24 hours;
[0067] After the reaction, the solution in the reactor was cooled, solid-liquid separation was performed, the solid was washed with water three times, then washed with anhydrous ethanol three times, and then the solid was dried in a vacuum oven for 15h to obtain MoS2;
[0068] The dried MoS2 was dispersed in 160ml of 3.75mmol / L iron nitrate solution, and after stirring for 20h, 0.2268g of sodium borohydride was added and stirred for 1h to perform the reduction reaction.
[0069] After the reduction reaction was completed, the reaction solution was vacuum dried to obtain the iron-modified MoS2 piezoelectric catalytic material.
[0070] Example 4
[0071] (NH4)2MoO4(2mmol) and thiourea (50mmol) were added to water and stirred for about 10min to dissolve, obtaining a mixed solution;
[0072] The mixed solution was transferred to a 100ml autoclave and hydrothermally reacted at 200℃ for 24h;
[0073] After the reaction, the solution in the reactor was cooled, solid-liquid separation was performed, the solid was washed with water three times, then washed with anhydrous ethanol three times, and then the solid was dried in a vacuum oven for 15h to obtain MoS2;
[0074] The dried MoS2 was dispersed in 160ml of 1.25mmol / L iron nitrate solution, and after stirring for 20h, 0.0756g of sodium borohydride was added and stirred for 1h to perform the reduction reaction.
[0075] After the reduction reaction was completed, the reaction solution was vacuum dried to obtain the iron-modified MoS2 piezoelectric catalytic material.
[0076] Comparative Example 1
[0077] The difference from Example 1 is that only the iron nitrate is replaced with cobalt nitrate, to obtain a cobalt-modified MoS2 piezoelectric catalytic material.
[0078] Comparative Example 2
[0079] The difference from Example 1 is that only the iron nitrate is replaced with nickel nitrate, to obtain a nickel-modified MoS2 piezoelectric catalytic material.
[0080] Comparative Example 3
[0081] The difference from Example 1 is that only the iron nitrate is replaced with copper nitrate, to obtain a copper-modified MoS2 piezoelectric catalytic material.
[0082] Comparative Example 4
[0083] The difference from Example 1 is that only the ferric nitrate is replaced by zinc nitrate, i.e. a zinc modified molybdenum disulfide piezoelectric catalytic material is obtained.
[0084] The catalytic performance of the piezoelectric catalytic materials prepared in Examples 1-4 and Comparative Examples 1-4 is detected.
[0085] Test One
[0086] Prepare 350 ml of 10 mg / L norfloxacin aqueous solution, divide it into 7 equal parts, and add 0.01 g of the iron modified molybdenum disulfide prepared in Example 1, molybdenum disulfide alone, and the piezoelectric catalytic materials prepared in Comparative Examples 1-4 to each part of the norfloxacin aqueous solution, respectively, and insert an ultrasonic rod therein; the remaining one group is used as a blank control, only insert an ultrasonic rod, and do not add a piezoelectric catalyst.
[0087] Set the parameters of the ultrasonic rod to 90 W power and 20 khz frequency, collect the sample every 1 min, and test the effect of piezoelectric catalytic degradation of organic pollutants.
[0088] Norfloxacin is used as a target pollutant to evaluate the piezoelectric catalytic performance. Compared with the modification of other transition metal salts and single ultrasonic action, it is found that the piezoelectric catalytic degradation performance of Fe-MoS2 is excellent, with a removal rate of 95.7% in 15 minutes (93.2% at 5 minutes). Compared with other materials, it also shows the fastest degradation rate, indicating that iron modified molybdenum disulfide can significantly improve the piezoelectric catalytic performance, which can be seen in detail in Figure 5 .
[0089] Test Two
[0090] Prepare 150 ml of 10 mg / L norfloxacin aqueous solution, divide it into 3 equal parts, and add the iron modified molybdenum disulfide prepared in Example 1 to each part of the norfloxacin aqueous solution to make the concentration 0.1 g / L, 0.2 g / L and 0.3 g / L, respectively, and insert an ultrasonic rod therein. Set the parameters of the ultrasonic rod to 90 W power and 20 khz frequency, collect the sample every 1 min, and test the effect of piezoelectric catalytic degradation of organic pollutants.
[0091] The piezoelectric catalytic degradation performance of norfloxacin under different catalyst dosages is shown in the following figure Figure 6 .
[0092] Test Three
[0093] Prepare 10 mg / L norfloxacin aqueous solution 200 ml, divided into 4 parts, each norfloxacin aqueous solution is added to the iron modified molybdenum disulfide prepared in example 1, so that its concentration is 0.2 g / L, and the ultrasonic rod is inserted therein, and the ultrasonic rod parameters are set to 45 W, 90 W, 135 W, 180 W power, 20 khz frequency, every 1 min, sample collection, test piezoelectric catalytic degradation of organic pollutants effect.
[0094] The piezoelectric catalytic degradation of norfloxacin under different ultrasonic power conditions is shown in the following figure: Figure 7 .
[0095] Test four
[0096] Prepare 5, 10, 15 and 20 mg / L norfloxacin aqueous solution 50 ml, each norfloxacin aqueous solution is added to the iron modified molybdenum disulfide prepared in example 1, so that its concentration is 0.2 g / L, and the ultrasonic rod is inserted therein, and the ultrasonic rod parameters are set to 90 W power, 20 khz frequency, every 1 min, sample collection, test piezoelectric catalytic degradation of organic pollutants effect.
[0097] The piezoelectric catalytic degradation of norfloxacin under different substrate concentration conditions is shown in the following figure: Figure 8 .
[0098] It can be seen that Fe-MoS2 realizes excellent removal effect under different norfloxacin substrate concentrations, different catalytic dosages and different ultrasonic powers.
[0099] Test five
[0100] Prepare 10 mg / L norfloxacin aqueous solution 200 ml, divided into 4 parts, each norfloxacin aqueous solution is added to the iron modified molybdenum disulfide prepared in example 2-4, so that its concentration is 0.2 g / L, and the ultrasonic rod is inserted therein, and the ultrasonic rod parameters are set to 90 W power, 20 khz frequency, every 1 min, sample collection, test piezoelectric catalytic degradation of organic pollutants effect.
[0101] The piezoelectric catalytic degradation of norfloxacin under different molar ratios of molybdenum disulfide and trivalent iron is shown in the following figure: Figure 9 .
[0102] Test six
[0103] The generation of hydrogen peroxide in the catalytic process of different catalysts was tested by iodometric method. The yield of hydrogen peroxide was determined by UV spectrophotometry. 50 ml of 10 mg / L norfloxacin aqueous solution was prepared, and the iron modified molybdenum disulfide prepared in example 1 was added to make the concentration of 0.2 g / L, and an ultrasonic rod was inserted therein. The parameters of the ultrasonic rod were set as 90 W power and 20 khz frequency. Every 1 min, the sample was collected. 1.5 ml of 0.1 M potassium iodide solution and 50 μl of 0.01 M ammonium molybdate solution were added to 500 μL of the test solution. After 15 min of reaction, the absorbance value was determined at 352 nm.
[0104] Among them, the hydrogen peroxide content of Fe-MoS2 is the lowest, which is due to the rapid reaction with Fe or Mo ions to consume the in-situ generated hydrogen peroxide, also confirming the occurrence of Fenton-like reaction.
[0105] The generation of hydrogen peroxide in the catalytic process of different catalysts is shown in Figure 10 .
[0106] The above only describes the preferred embodiments of the present application and is not used to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims
1. A method for preparing an iron-modified molybdenum disulfide-based piezocatalytic material, characterized by: The method comprises the following steps: ammonium molybdate and thiourea are mixed with water in a certain proportion, and then the mixture is subjected to hydrothermal reaction; the solution after the hydrothermal reaction is dried to obtain molybdenum disulfide; the molybdenum disulfide is mixed with a ferric salt solution and stirred, and then a reducing agent is added for reduction; the solution after the reduction is collected and dried to obtain the iron-modified molybdenum disulfide-based piezoelectric catalytic material; the reducing agent is sodium borohydride, stannous chloride or potassium borohydride.
2. The method for preparing the iron-modified molybdenum disulfide-based piezoelectric catalytic material according to claim 1, characterized in that: The molar ratio of ammonium molybdate to thiourea is 1.5-2.5:30-60.
3. The method for preparing the iron-modified molybdenum disulfide-based piezoelectric catalytic material according to claim 1, characterized in that: The molar ratio of ammonium molybdate to thiourea is 2:
50.
4. The method for preparing the iron-modified molybdenum disulfide-based piezoelectric catalytic material according to claim 1, characterized in that: The temperature of the hydrothermal reaction is 180-220℃, and the time of the hydrothermal reaction is 20-30h.
5. The method for preparing the iron-modified molybdenum disulfide-based piezoelectric catalytic material according to claim 1, characterized in that: The temperature of the hydrothermal reaction is 200℃, and the time of the hydrothermal reaction is 24h.
6. The method for preparing the iron-modified molybdenum disulfide-based piezoelectric catalytic material according to claim 1, characterized in that: The method comprises the steps of washing the dried molybdenum disulfide with water and anhydrous ethanol in sequence.
7. The method for preparing the iron-modified molybdenum disulfide-based piezoelectric catalytic material according to claim 1, characterized in that: The method comprises the step of drying the washed molybdenum disulfide.
8. The method for preparing the iron-modified molybdenum disulfide-based piezoelectric catalytic material according to claim 1, characterized in that: The molar ratio of molybdenum disulfide to ferric ions is 1:0.15-1.
05.
9. The method for preparing the iron-modified molybdenum disulfide-based piezoelectric catalytic material according to claim 1, characterized in that: The molybdenum disulfide is mixed with the ferric salt solution and stirred for 20-30h.
10. The method for preparing the iron-modified molybdenum disulfide-based piezoelectric catalytic material according to claim 1, characterized in that: The molar ratio of ferric ions to sodium borohydride is 1:
5.
11. The method for preparing the iron-modified molybdenum disulfide-based piezoelectric catalytic material according to claim 1, characterized in that: After the reducing agent is added, the mixture is stirred for 1h.
12. The method of claim 1, wherein the method is characterized by: The method further comprises the step of washing the prepared iron-modified molybdenum disulfide-based piezoelectric catalytic material with water and anhydrous ethanol.
13. An iron-modified molybdenum disulfide-based piezocatalytic material, characterized by: The iron-modified molybdenum disulfide-based piezoelectric catalytic material is prepared by the method of any one of claims 1-12.
14. The iron-modified molybdenum disulfide-based piezoelectric catalytic material of claim 13 is used for electrocatalytic degradation of organic pollutants.
15. Use of the iron-modified molybdenum disulfide-based piezocatalytic material according to claim 13 for the electrocatalytic degradation of organic pollutants, characterized in that: The organic pollutants are norfloxacin.
16. A method for piezocatalytic degradation of norfloxacin, characterized by: The method comprises the following steps: the iron-modified molybdenum disulfide-based piezoelectric catalytic material of claim 13 is placed in wastewater to be degraded, and ultrasound is applied for degradation.
17. The piezocatalytic degradation method of norfloxacin as claimed in claim 16, wherein: The frequency of the applied ultrasound is 20kHz, and the power is 90 W.