Carbon fiber-anchored bimetallic nanoparticle electrocatalytic material and preparation method and application thereof

Abstract

The application discloses carbon fiber anchoring bimetallic nanoparticles electrocatalytic material and a preparation method and application thereof. The bimetallic nanoparticles are uniformly dispersed in a fiber base, and the preparation steps comprise the following steps: dissolving an iron source and a manganese source in an organic solvent, adding an organic polymer, stirring uniformly to obtain a precursor solution; performing electrostatic spinning by using the precursor solution, the organic polymer is dragged by an electric field in a jet flow state and solidified, and the metal is anchored in the fiber original wire in situ; and performing pre-oxidation and carbonization treatment on the fiber original wire in sequence to obtain the carbon fiber anchoring bimetallic nanoparticles electrocatalytic material. The electrocatalytic material has the advantages of multiple active sites, good cycle stability and low metal leaching amount. The electrocatalytic material can realize efficient electrocatalytic degradation of organic pollutants in water, and has the advantages of strong anti-interference ability and wide application range.

Description

Technical Field

[0001] This invention belongs to the field of environmental functional materials, specifically relating to an electrocatalytic material of carbon fiber anchored bimetallic nanoparticles, its preparation method, and its application. Background Technology

[0002] The rapid development of industry and agriculture has brought numerous conveniences and benefits to humanity and society, but it has also generated a large amount of wastewater containing recalcitrant organic pollutants. These organic pollutants enter water in various ways, increasing environmental risks and posing challenges to existing water treatment technologies. Treatment methods for pollutants in water bodies include adsorption separation and oxidative conversion. Among these, electrocatalysis technology has advantages such as rapid degradation rate, wide applicability, simple operation, ease of combination with other technologies, and reduction of secondary pollution, thus showing promising prospects for saving chemical and energy resources, controlling pollution, and obtaining clean water. Electrocatalysis mainly degrades pollutants in water through direct or indirect oxidation reactions near the electrode, with indirect oxidation generally playing a dominant role. The composite of conductive carbon substrates and metal oxides can accelerate electron transfer and reduce metal leaching.

[0003] In recent years, researchers have developed electrocatalytic materials using carbon nanotubes, graphene, and biochar as carbon substrates. Furthermore, composite structures such as covalent organic frameworks and metal-organic frameworks (MOFs) have also been extensively studied. Cui et al. (ACS Catal. 2022, 12, 13334–13348) deposited a layer of graphene on the surface of oxyferric chloride, significantly enhancing its electrocatalytic activity. However, this method has certain drawbacks: it is difficult to directly and uniformly disperse metal oxides on chemically inert and hydrophobic carbon substrates, and the necessary pretreatment process reduces the mechanical strength and conductivity of the support, sacrificing some long-term stability. Electrospinning technology can disperse metal precursors into a spinning solution containing a carbon source, and the in-situ doping strategy holds promise for achieving carbon-metal oxide composites without damaging the support. Chinese invention patent CN116835720A discloses a nano-zero-valent iron-based fiber electrode, its preparation method, and its application. However, due to the presence of pre-prepared MOFs and carbon black particles to enhance conductivity in its spinning solution, the active metal species are not grown and composited in situ. This leads to problems such as increased fiber diameter, reduced active sites and surface area, and MOF aggregation, thereby reducing the activity of the electrocatalytic material. Electrocatalytic degradation efficiency, energy consumption, and cost are all related to electrocatalytic materials. However, existing electrocatalytic materials face numerous challenges, including high interfacial charge transfer resistance, aggregation and masking of active components, cumbersome preparation methods, and loss of active components, hindering their application in the environmental field. Therefore, improving the overall activity and stability of electrocatalytic materials still faces key technological bottlenecks. Summary of the Invention

[0004] Purpose of the invention: The purpose of this invention is to provide an electrocatalytic material of carbon fiber anchored bimetallic nanoparticles with multiple active sites, good cycle stability, low metal leaching, and high efficiency in electrocatalytic degradation of organic pollutants in water; another purpose of this invention is to provide a preparation method and application of this electrocatalytic material.

[0005] Technical solution: The electrocatalytic material of carbon fiber anchored bimetallic nanoparticles of the present invention includes carbon fiber and bimetallic nanoparticles. The bimetallic nanoparticles anchored by the carbon fiber are uniformly dispersed. The bimetallic nanoparticles are a mixture of iron oxide and manganese oxide with a particle size of less than 10 nm.

[0006] Preferably, the content of iron and manganese in the electrocatalytic material of carbon fiber anchored bimetallic nanoparticles is 2% to 3%.

[0007] Preferably, the iron oxide is at least one of Fe3O4 and Fe2O3; the manganese oxide is MnO.

[0008] The preparation method of the electrocatalytic material of carbon fiber anchored bimetallic nanoparticles according to the present invention includes the following steps:

[0009] (1) Dissolve the iron source and manganese source in an organic solvent, add an organic polymer and stir until homogeneous to obtain a precursor solution;

[0010] (2) Electrospinning is performed using a precursor solution. The organic polymer is drawn into a jet shape by an electric field and solidified, while the metal is anchored in situ in the fiber filament.

[0011] (3) The fiber filaments were subjected to pre-oxidation and carbonization treatments in sequence to obtain an electrocatalytic material with carbon fiber anchored bimetallic nanoparticles.

[0012] Preferably, in step (1), the mass ratio of iron source to manganese source is 2:1 to 1:2; the total amount of iron source and manganese source added is 4 wt% to 10 wt% of organic solvent; and the amount of organic polymer added is 10 wt% to 15 wt% of organic solvent.

[0013] Preferably, in step (1), the iron source is selected from at least one of ferric acetate, ferric chloride, ferric nitrate, and ferric acetylacetone; and the manganese source is selected from at least one of manganese acetate, manganese chloride, manganese nitrate, and manganese acetylacetone.

[0014] Preferably, in step (1), the organic polymer is selected from at least one of polyacrylonitrile (PAN), polyvinylpyrrolidone (PVP), and polyethyleneimine (PEI).

[0015] Preferably, in step (1), the organic solvent is selected from at least one of N,N-dimethylformamide (DMF), ethanol, and chloroform.

[0016] Preferably, in step (2), the electrospinning parameters are set as follows: voltage 16-22kV, spinning solution flow rate 0.8-1.5mL / min; distance from spinning needle tip to roller 12-18cm, roller speed 600-1200rpm; temperature room temperature, humidity 25-35%.

[0017] Preferably, in step (3), the pre-oxidation is carried out in an air or oxygen atmosphere, with the temperature increased to 200-300°C at a rate of 1-5°C / min, and the holding time at 200-300°C is 1-2 hours; the carbonization is carried out in an argon or nitrogen atmosphere, with the temperature increased to 700-1000°C at a rate of 5-10°C / min, and the holding time at 700-1000°C is 1-2 hours.

[0018] The application of the carbon fiber-anchored bimetallic nanoparticle electrocatalytic material described in this invention in the treatment of organic pollutants in water.

[0019] Preferably, the electrocatalytic material of the carbon fiber-anchored bimetallic nanoparticles is used as a cathode, which efficiently degrades organic pollutants in water by activating O2 to form active oxygen species.

[0020] Technical Principle: This invention utilizes an in-situ doping strategy combined with the synergistic effect of bimetals to create an electrocatalytic material with carbon fiber anchored bimetallic nanoparticles, exhibiting excellent performance in treating organic pollutants in wastewater. Specifically: (1) The metal salt is directly dispersed and stabilized in a viscous polymer solution, and extruded from a needle under pump control. The electric field acts as a stretching agent, making it jet-like, and also promotes solvent evaporation, solidifying it into long fibers. The fiber substrate is anchored with metal species, and the growth of metal nanoparticles is restricted during subsequent heat treatment. (2) Bimetals contribute the main source of active sites. On the one hand, manganese doping improves the adsorption capacity for oxygen, and on the other hand, iron doping enhances the activation capacity for oxygen. Moreover, iron and manganese have similar atomic radii, and their combination has a high driving force, promoting rapid electron transfer while facilitating the formation of more stable nanoparticles, thereby achieving the synergistic effect of bimetals.

[0021] Beneficial effects: Compared with the prior art, the present invention has the following significant advantages:

[0022] (1) The iron-manganese bimetallic oxide is uniformly dispersed in the carbon substrate in small size and tightly bound to it, which increases the active sites, reduces the interfacial transfer resistance, and accelerates electron transport.

[0023] (2) During the heat treatment process, the polymer pyrolysis produces reducing gas, resulting in a material with a mesoporous structure, which further increases the specific surface area and can significantly enhance the reaction space between pollutants and ROS, which is conducive to achieving efficient degradation of organic pollutants.

[0024] (3) Iron-manganese bimetallic oxides are anchored in carbon fibers, which improves cycle stability and significantly reduces metal leaching.

[0025] (4) The iron-manganese bimetallic oxide coated with carbon fiber has a synergistic effect, which not only improves the degradation effect of organic pollutants, but also enhances the anti-interference ability. It is less affected by the pH of actual wastewater and complex components such as various inorganic salts, and its environmental adaptability is significantly enhanced. Attached Figure Description

[0026] Figure 1 This is a transmission electron microscope (TEM) image of the carbon fiber-anchored bimetallic nanoparticle electrocatalytic material in Example 2 of the present invention.

[0027] Figure 2 The X-ray diffraction patterns of the electrocatalytic materials in Example 2 and Comparative Examples 1-3 of this invention are shown below.

[0028] Figure 3 The graphs show the degradation effect of the electrocatalytic materials on thiamethoxam in water in Example 2 and Comparative Examples 1-3 of this invention.

[0029] Figure 4 The graphs show the degradation effect of the electrocatalytic materials in Examples 1-3 of this invention on thiamethoxam in water.

[0030] Figure 5 The cyclic stability of the electrocatalytic material for the degradation of thiamethoxam in Example 2 of this invention;

[0031] Figure 6 This is a graph showing the metal leaching amount of the electrocatalytic material after multiple cycles in Example 2 of the present invention;

[0032] Figure 7 This is a diagram illustrating the degradation effect of the electrocatalytic material in Example 5 of the present invention on various organic pollutants in water.

[0033] Figure 8 This is a graph showing the degradation effect of the electrocatalytic material in the presence of inorganic salt ions in Example 5 of the present invention;

[0034] Figure 9 The graph shows the degradation effect of the electrocatalytic material in Example 5 of this invention at different pH values. Detailed Implementation

[0035] The technical solution of the present invention will be further described below with reference to the accompanying drawings.

[0036] Example 1

[0037] A method for preparing an electrocatalytic material with carbon fiber anchored bimetallic nanoparticles includes the following steps:

[0038] (1) First, prepare the spinning solution. The specific steps are as follows: dissolve 0.26g ferric acetate and 0.53g manganese acetate in 8.5g DMF, sonicate for 10min, then add 1.4g PAN, stir overnight at room temperature to fully dissolve.

[0039] (2) After defoaming the spinning solution obtained in step (1) by sonication for 10 min, it is transferred into a 5 mL needleless syringe, fixed to the injection pump of the spinning machine, and electrospinned to obtain fiber precursors. The electrospinning parameters are set as follows: voltage 20 kV, spinning solution flow rate 1.0 mL / min; distance from spinning needle tip to roller 15 cm, roller speed 800 rpm; temperature room temperature, humidity 35%.

[0040] (3) The fiber precursor obtained in step (2) was placed in a muffle furnace and heated to 250°C at a rate of 2°C / min, and held for 1.5 h for pre-oxidation treatment. The pre-oxidized brown-black fiber was then removed and placed in a tube furnace. Under an argon atmosphere, the temperature was increased to 800°C at a rate of 5°C / min and held for 2 h for carbonization treatment. An electrocatalytic material (Fe1Mn2@N-CNF) with carbon fiber anchored bimetallic nanoparticles was obtained.

[0041] Example 2

[0042] The remaining steps in this embodiment are the same as in Example 1, except that the mass ratio of the added iron source and manganese source is changed to 1:1, i.e., 0.4g of ferric acetate and 0.4g of manganese acetate are added. The product is denoted as Fe1Mn1@N-CNF.

[0043] Example 3

[0044] The remaining steps in this embodiment are the same as in Example 1, except that the mass ratio of the added iron source to the manganese source is changed to 2:1, i.e., 0.53g of ferric acetate and 0.26g of manganese acetate are added. The product is denoted as Fe2Mn1@N-CNF.

[0045] Example 4

[0046] The remaining steps in this embodiment are the same as in embodiment 2, except that the added organic polymer is replaced by PVP instead of PAN, i.e., 1.4g of PVP is added.

[0047] Example 5

[0048] The remaining steps in this embodiment are the same as in embodiment 2, except that the iron and manganese sources added are replaced by ferric chloride and manganese chloride, respectively, instead of ferric acetate and manganese acetate.

[0049] Example 6

[0050] A method for preparing an electrocatalytic material with carbon fiber anchored bimetallic nanoparticles includes the following steps:

[0051] (1) First, prepare the spinning solution. The specific steps are as follows: Dissolve 0.4g ferric acetate and 0.4g manganese acetate in 8.5g DMF, sonicate for 10min, then add 1.2g PAN, stir overnight at room temperature to fully dissolve.

[0052] (2) After defoaming the spinning solution obtained in step (1) by sonication for 10 min, it is transferred into a 5 mL needleless syringe, fixed to the injection pump of the spinning machine, and electrospinned to obtain fiber precursors. The electrospinning parameters are set as follows: voltage 22 kV, spinning solution flow rate 1.5 mL / min; distance from spinning needle tip to roller 18 cm, roller speed 1200 rpm; temperature room temperature, humidity 35%.

[0053] (3) The fiber precursor obtained in step (2) was placed in a muffle furnace and heated to 250°C at a rate of 5°C / min, and held for 1.5 h for pre-oxidation treatment. The pre-oxidized brown-black fiber was then removed and placed in a tube furnace. Under an argon atmosphere, the temperature was increased to 900°C at a rate of 10°C / min and held for 1.5 h for carbonization treatment. Electrocatalytic materials with carbon fiber-anchored bimetallic nanoparticles were obtained.

[0054] Example 7

[0055] A method for preparing an electrocatalytic material with carbon fiber anchored bimetallic nanoparticles includes the following steps:

[0056] (1) First, prepare the spinning solution. The specific steps are as follows: Dissolve 0.11g ferric acetate and 0.22g manganese acetate in 8.5g DMF, sonicate for 10min, then add 0.85g PEI and stir overnight at room temperature until fully dissolved.

[0057] (2) After defoaming the spinning solution obtained in step (1) by sonication for 10 min, it is transferred into a 5 mL needleless syringe, fixed to the injection pump of the spinning machine, and electrospinned to obtain fiber precursors. The electrospinning parameters are set as follows: voltage 16 kV, spinning solution flow rate 0.8 mL / min; distance from spinning needle tip to roller 12 cm, roller speed 600 rpm; temperature room temperature, humidity 25%.

[0058] (3) The fiber precursor obtained in step (2) was placed in a muffle furnace and heated to 230°C at a rate of 1°C / min, and held for 1 hour for pre-oxidation treatment. The pre-oxidized brown-black fiber was then removed and placed in a tube furnace. Under an argon atmosphere, the temperature was increased to 700°C at a rate of 5°C / min and held for 1 hour for carbonization treatment. An electrocatalytic material with carbon fiber anchored bimetallic nanoparticles was obtained.

[0059] Example 8

[0060] A method for preparing an electrocatalytic material with carbon fiber anchored bimetallic nanoparticles includes the following steps:

[0061] (1) First, prepare the spinning solution. The specific steps are as follows: Dissolve 0.28g ferric acetate and 0.57g manganese acetate in 8.5g chloroform, sonicate for 10min, then add 1.28g PVP, stir overnight at room temperature to fully dissolve.

[0062] (2) After defoaming the spinning solution obtained in step (1) by sonication for 10 min, it is transferred into a 5 mL needleless syringe, fixed to the injection pump of the spinning machine, and electrospinned to obtain fiber precursors. The electrospinning parameters are set as follows: voltage 22 kV, spinning solution flow rate 1.5 mL / min; distance from spinning needle tip to roller 18 cm, roller speed 1200 rpm; temperature room temperature, humidity 35%.

[0063] (3) The fiber precursor obtained in step (2) was placed in a muffle furnace and heated to 280°C at a rate of 5°C / min, and held for 2 hours for pre-oxidation treatment. The pre-oxidized brown-black fiber was then removed and placed in a tube furnace. Under an argon atmosphere, the temperature was increased to 1000°C at a rate of 10°C / min and held for 2 hours for carbonization treatment. An electrocatalytic material with carbon fiber anchored bimetallic nanoparticles was obtained.

[0064] Comparative Example 1

[0065] A method for preparing carbon fiber electrocatalytic material. The remaining steps of this comparative example are the same as in Example 1, except that no iron or manganese source is added, and the product is denoted as N-CNF.

[0066] Comparative Example 2

[0067] A method for preparing an electrocatalytic material of carbon fiber-anchored ultrasmall iron oxide nanoparticles. The remaining steps of this comparative example are the same as in Example 1, except that no manganese source is added, i.e., only 0.8 g of iron acetate is added, and the product is denoted as Fe@N-CNF.

[0068] Comparative Example 3

[0069] A method for preparing an electrocatalytic material of carbon fiber-anchored ultrasmall manganese oxide nanoparticles. The remaining steps of this comparative example are the same as in Example 1, except that no iron source is added, i.e., only 0.8 g of manganese acetate is added, and the product is denoted as Mn@N-CNF.

[0070] Application Example 1

[0071] Figure 1This is a transmission electron microscope (TEM) image of the carbon fiber-anchored bimetallic nanoparticle electrocatalytic material in Example 2 of the present invention. Figure 2 The X-ray diffraction patterns are those of the electrocatalytic materials in Examples 2 and Comparative Examples 1-3 of the present invention.

[0072] The degradation effect of the electrocatalytic materials prepared in Examples 1-3 and Comparative Examples 1-3 of the present invention on the organic pesticide thiamethoxam in water was investigated. The specific methods are as follows:

[0073] (1) Grind the material to be tested thoroughly in a mortar, weigh 6 mg of the ground material, and disperse it in a slurry. The slurry composition ratio is: 3% naphthol as binder, 100 μL of pure water and 400 μL of anhydrous ethanol as dispersion. Sonicate the prepared slurry for more than 40 min, drop it onto hydrophobic carbon cloth (Bare CC), and dry it at room temperature for more than 4 h to obtain the electrode sheet.

[0074] (2) The electrode sheet prepared in step (1) is used as the cathode in the three-electrode system, the anode is a platinum sheet, and the reference is a saturated calomel electrode. The reactor is a gas diffusion electrode, and oxygen flows through the side of the electrode sheet that is not loaded with material, with the gas flow rate set to 10 mL / min.

[0075] (3) Prepare 0.05M Na2SO4 solution as electrolyte, prepare 10ppm thiamethoxam as pollutant, the reaction system is 15mL, and the initial pH is 5.7.

[0076] (4) The initial voltage was set to -0.5V, and samples were taken at intervals and quenched in a fixed amount of methanol. The samples were filtered through a 0.45μm microporous membrane filter, and the concentration changes of thiamethoxam were analyzed by high-performance liquid chromatography (HPLC) to obtain the degradation efficiency of different materials. The results are as follows: Figure 3 , 4 As shown, the doping and synergistic effect of bimetallic oxides accelerated the degradation rate of pollutants compared to the control group.

[0077] Application Example 2

[0078] The cyclic stability of the electrocatalytic material of carbon fiber anchored bimetallic nanoparticles prepared in Example 2 of this invention for degrading thiamethoxam in water was investigated. The specific method is as follows:

[0079] (1) Grind the material to be tested thoroughly in a mortar, weigh 6 mg of the ground material, and disperse it in a slurry. The slurry composition ratio is: 3% naphthol as a binder, 100 μL of pure water and 400 μL of anhydrous ethanol as a dispersion. Sonicate the prepared slurry for more than 40 min, drop it onto a hydrophobic carbon cloth, and dry it at room temperature for more than 4 h to obtain an electrode sheet.

[0080] (2) The electrode sheet prepared in step (1) is used as the cathode in the three-electrode system, the anode is a platinum sheet, and the reference is a saturated calomel electrode. The reactor is a gas diffusion electrode, and oxygen flows through the side of the electrode sheet that is not loaded with material. The gas flow rate is set to 10 mL / min and connected to an electrochemical workstation (Chenhua 760e).

[0081] (3) Prepare 0.05M Na2SO4 solution as electrolyte, prepare 10ppm thiamethoxam as pollutant, the reaction system is 15mL, and the initial pH is 5.7.

[0082] (4) Set the initial voltage to -0.5V and take samples at intervals to quench in a quantitative amount of methanol. After filtering the samples through a 0.45μm microporous membrane filter, analyze the concentration change of thiamethoxam by high performance liquid chromatography to test the cyclic stability of the material's degradation effect on thiamethoxam.

[0083] (5) After the reaction is completed, the solution is poured out and the sample is filtered through a 0.45μm microporous membrane filter. The concentrations of iron and manganese ions in the tail sample are tested using an inductively coupled plasma luminescence analyzer to determine the metal leaching amount.

[0084] (6) Rinse the surface of the electrode plate gently with ultrapure water three times, and repeat steps (3)-(5) ten times.

[0085] The results are as follows Figure 5 , 6 As shown, the electrocatalytic material with carbon fiber anchored bimetallic nanoparticles maintained stable degradation performance after ten cycles, with extremely low metal leaching.

[0086] Application Example 3

[0087] The broad-spectrum degradation of pollutants by the carbon fiber-anchored bimetallic nanoparticle electrocatalytic material prepared in Example 5 of this invention was investigated. The electrocatalytic degradation steps were the same as in Application Example 1, except that the organic pollutants were replaced with the organic pesticides imidacloprid and acetamiprid; the antibiotics sulfamethoxazole, ciprofloxacin, and carbamazepine; and the phenolic pollutant phenol.

[0088] Depend on Figure 7 It can be seen that the electrocatalytic material with carbon fiber anchored bimetallic nanoparticles has a good effect on the treatment of a variety of recalcitrant organic pollutants.

[0089] Application Example 4

[0090] The interference resistance of the electrocatalytic material for pollutant degradation using carbon fiber-anchored bimetallic nanoparticles prepared in Example 5 of this invention was investigated. The electrocatalytic degradation steps were the same as in Application Example 1, except that 100 mM of various inorganic salts were added to each solution during preparation, and the pH was adjusted to neutral. The degradation effect was as follows: Figure 8As shown, the presence of inorganic salt ions hardly inhibits the degradation effect; in fact, the side reactions caused by the presence of certain ions accelerate the degradation.

[0091] Application Example 5

[0092] The interference resistance of the electrocatalytic material for pollutant degradation using carbon fiber-anchored bimetallic nanoparticles prepared in Example 5 of this invention was investigated. The electrocatalytic degradation steps were the same as in Application Example 1, except that the initial pH of the solution was adjusted to 3.0, 5.8, 7.0, 9.0, and 11.0 using H2SO4 and NaOH, respectively. The degradation effect is as follows: Figure 9 As shown, it maintains good degradation performance within a pH range of 3-11.

Claims

1. An electrocatalytic material of carbon fiber anchored bimetallic nanoparticles, characterized by, The carbon fiber anchoring double-metal nanoparticles are uniformly dispersed, and the double-metal nanoparticles are a mixture of iron oxide and manganese oxide with a particle size of less than 10 nm; the iron oxide is at least one of Fe3O4 and Fe2O3; the manganese oxide is MnO; and the carbon fiber anchoring double-metal nanoparticles are an electrocatalytic material. The preparation method of the carbon fiber anchoring double-metal nanoparticles electrocatalytic material comprises the following steps: (1) dissolving iron and manganese sources in an organic solvent, adding an organic polymer and stirring uniformly to obtain a precursor solution; the mass ratio of the iron source to the manganese source is 2:1-1:2; (2) electrospinning with the precursor solution, the organic polymer being pulled by an electric field into a jet and solidified, and the metal being anchored in situ in the fiber original wire; 2. A method for preparing an electrocatalytic material of carbon fiber anchored bimetallic nanoparticles as described in claim 1, characterized in that, (3) sequentially performing pre-oxidation and carbonization treatment on the fiber original wire to obtain the carbon fiber anchoring double-metal nanoparticles electrocatalytic material. The preparation method of the carbon fiber anchoring double-metal nanoparticles electrocatalytic material comprises the following steps: (1) dissolving iron and manganese sources in an organic solvent, adding an organic polymer and stirring uniformly to obtain a precursor solution; the mass ratio of the iron source to the manganese source is 2:1-1:2; (2) electrospinning with the precursor solution, the organic polymer being pulled by an electric field into a jet and solidified, and the metal being anchored in situ in the fiber original wire; 3. The method for preparing the electrocatalytic material of carbon fiber anchored bimetallic nanoparticles according to claim 2, characterized in that, (3) sequentially performing pre-oxidation and carbonization treatment on the fiber original wire to obtain the carbon fiber anchoring double-metal nanoparticles electrocatalytic material.

4. The method for preparing the electrocatalytic material of carbon fiber anchored bimetallic nanoparticles according to claim 2, characterized in that, In step (1), the total addition amount of the iron source and the manganese source is 4wt%-10wt% of the organic solvent; and the addition amount of the organic polymer is 10wt%-15wt% of the organic solvent.

5. The method for preparing the electrocatalytic material of carbon fiber anchored bimetallic nanoparticles according to claim 2, characterized in that, In step (1), the iron source is at least one of iron acetate, iron chloride, iron nitrate and acetylacetone iron; and the manganese source is at least one of manganese acetate, manganese chloride, manganese nitrate and acetylacetone manganese.

6. The method for preparing the electrocatalytic material of carbon fiber anchored bimetallic nanoparticles according to claim 2, characterized in that, In step (1), the organic polymer is at least one of polyacrylonitrile (PAN), polyvinylpyrrolidone (PVP) and polyethyleneimine (PEI).

7. The method for preparing the electrocatalytic material of carbon fiber anchored bimetallic nanoparticles according to claim 2, characterized in that, In step (2), the electrospinning parameters are set as follows: voltage 16-22kV, spinning solution flow rate 0.8-1.5mL / min; the distance from the spinning needle tip to the drum is 12-18cm, and the drum rotation speed is 600-1200rpm; the temperature is room temperature, and the humidity is 25%-35%. In step (3), the pre-oxidation is heating to 200-300℃ at a rate of 1-5℃ / min in an air or oxygen atmosphere, and the holding time at 200-300℃ is 1-2h; and the carbonization is heating to 700-1000℃ at a rate of 5-10℃ / min in an argon or nitrogen atmosphere, and the holding time at 700-1000℃ is 1-2h.

9. The use of carbon fiber-anchored bimetallic nanoparticles for electrocatalytic materials according to claim 8, characterized in that, 8. Application of the carbon fiber anchoring double-metal nanoparticles electrocatalytic material of claim 1 or the carbon fiber anchoring double-metal nanoparticles electrocatalytic material prepared by any one of the preparation methods of claims 2-7 in treating organic pollutants in water. The carbon fiber anchoring double-metal nanoparticles electrocatalytic material is used as a cathode to form active oxygen species by activating O2 to efficiently degrade organic pollutants in water.

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