CoFe2O4-coated MoS2 catalyst as well as preparation method and application thereof

Abstract

The invention provides a CoFe2O4-coated MoS2 catalyst as well as a preparation method and application thereof in the technical field of catalysts. The catalyst is prepared by compounding CoFe2O4 and MoS2, and the CoFe2O4 and the MoS2 are Wherein the MoS2 is of a layered structure, and the CoFe2O4 is nano-particles and is distributed among the MoS2 sheets. According to the invention, CoFe2O4 and MoS2 are compounded to prepare a novel CoFe2O4-coated MoS2 composite material, and the novel CoFe2O4-coated MoS2 composite material is applied to PAA to activate and degrade organic pollutants; the composite material has good magnetic separation performance and reusability, the activation efficiency of PAA can be remarkably improved, and efficient degradation of various organic pollutants is achieved.

Description

Technical Field

[0001] The present invention belongs to the technical field of catalysts, and more specifically, relates to a CoFe 2 O 4 @MoS 2 catalyst and its preparation method and application. Background Art

[0002] With the rapid development of industrialization and urbanization, the problem of organic pollutants in water bodies and soil has become increasingly serious, and has become one of the major challenges in global environmental governance. There are a wide variety of organic pollutants, including dyes, pesticides, drug residues, phenolic compounds, etc. These substances usually have toxicity, poor degradability and bioaccumulation, posing a serious threat to the ecological environment and human health. Traditional physicochemical treatment methods, such as adsorption, precipitation, oxidation, etc., although they can remove organic pollutants to a certain extent, often have problems such as low efficiency, high cost, and easy generation of secondary pollution, and it is difficult to meet the needs of modern environmental protection. Therefore, the development of efficient, environmentally friendly and economical organic pollutant degradation technologies has become a research hotspot.

[0003] In recent years, advanced oxidation technologies (AOPs) have received extensive attention in the field of organic pollutant degradation due to their high efficiency and rapidity. Among them, the advanced oxidation technology based on peracetic acid (PAA) has become one of the research hotspots due to its strong oxidation ability, mild reaction conditions and few by-products. PAA is a strong oxidant that can achieve the complete mineralization of organic pollutants by generating hydroxyl radicals (HO • ). However, the activation efficiency of PAA is relatively low, and usually a catalyst needs to be used to improve its oxidation ability. Currently, commonly used catalysts include metal oxides, metal nanoparticles, carbon-based materials, etc., but these catalysts still have some problems in practical applications, such as insufficient catalytic activity, poor stability, low reusability, etc. Therefore, the development of new, efficient and stable catalysts has become the key to improving the activation efficiency of PAA.

[0004] Among many catalyst materials, two-dimensional layered materials exhibit excellent catalytic performance due to their high specific surface area and abundant active sites. For example, molybdenum disulfide (MoS 2 ) as a typical two-dimensional material, has a unique layered structure and excellent electron transport performance, and has been widely used in fields such as catalysis and energy storage. However, a single MoS 2 material has problems such as insufficient exposure of active sites and limited catalytic efficiency during the catalytic process. To overcome these deficiencies, researchers have tried to composite MoS 2 with other functional materials to achieve a synergistic catalytic effect. For example, combining MoS 2Composite with metal oxides, metal nanoparticles, etc., can significantly improve its catalytic performance. However, current research on the application of MoS 2 -based composites in the activation degradation of organic pollutants by PAA is still relatively limited, especially the degradation effect and mechanism for complex organic pollutants are not yet clear.

[0005] On the other hand, spinel-type ferrite materials (such as CoFe 2 O 4 ) have broad application prospects in the field of environmental governance due to their good magnetic properties, chemical stability and catalytic activity. CoFe 2 O 4 , as a typical spinel-type ferrite, has abundant oxygen vacancies and surface active sites, which can effectively activate PAA to generate hydroxyl radicals, thus achieving efficient degradation of organic pollutants. However, there are still some problems in the practical application of single CoFe 2 O 4 material, such as small specific surface area and limited active sites, resulting in difficulty in further improving its catalytic efficiency. To solve these problems, researchers have tried to composite CoFe 2 O 4 with other materials to improve its catalytic performance. For example, composite CoFe 2 O 4 with carbon materials, metal-organic frameworks (MOFs), etc., can significantly improve its catalytic activity and stability. However, current research on the application of CoFe 2 O 4 -based composites in the activation degradation of organic pollutants by PAA is still relatively limited, especially the degradation effect and mechanism for complex organic pollutants are not yet clear. Summary of the Invention

[0006] The object of the present invention is to address the above deficiencies and provide a CoFe 2 O 4 @MoS 2 catalyst, its preparation method and application. By composite CoFe 2 O 4 with MoS 2 , a novel CoFe 2 O 4 @MoS 2 composite material is prepared and applied to the activation degradation of organic pollutants by PAA; this composite material has good magnetic separation performance and reusability, can significantly improve the activation efficiency of PAA, and achieve efficient degradation of various organic pollutants.

[0007] To achieve the above object, the present invention is realized through the following technical solutions:

[0008] In a first aspect, the present invention provides a CoFe 2 O 4 @MoS 2 catalyst, wherein the catalyst is composed of CoFe 2 O 4 and MoS 2 compounded; wherein, the MoS 2 is in a layered structure, and the CoFe 2 O 4 is in the form of nanoparticles and is distributed between the MoS 2 flakes.

[0009] In a second aspect, the present invention further provides a method for preparing the sulfur-doped CoFeO 2 catalyst according to the first aspect, comprising:

[0010] Dissolve Co(NO 3 ) 2 ·6H 2 O and Fe(NO 3 ) 2 ·9H 2 O in deionized water to prepare a mixed solution, and adjust the pH value to 10 - 11;

[0011] Add MoS 2 nanosheets to the above mixed solution, and mix and disperse evenly to obtain a reaction solution;

[0012] Place the above reaction solution in a reaction vessel for hydrothermal reaction. After the reaction is completed, the CoFe 2 O 4 @MoS 2 catalyst is prepared.

[0013] Preferably, the molar ratio of Co(NO 3 ) 2 ·6H 2 O to Fe(NO 3 ) 2 ·9H 2 O is 1:(0.5 - 2.0).

[0014] Preferably, the pH value is adjusted by adding an alkaline pH regulator, and the alkaline pH regulator can be ammonia water, dilute sodium hydroxide solution or other alkaline pH regulators.

[0015] Preferably, the mass ratio of MoS 2 to CoFe 2 O 4 is (10.0 - 1.0):1.

[0016] Preferably, the MoS 2 The process parameters for the mixing and dispersion of the nanosheets in the mixed solution are as follows: ultrasonic treatment for 20 - 40 min, and then stirring for 1 - 2 hours.

[0017] Preferably, the reaction vessel is a hydrothermal reactor, and the conditions for the hydrothermal reaction are a temperature of 180°C - 200°C, a reaction time of 20 - 30 hours, and a pressure of 1.0 - 1.5 Mpa.

[0018] Preferably, the method further includes cleaning and drying after the reaction; the cleaning includes first cleaning 2 - 4 times with absolute ethanol and then cleaning 2 - 4 times with deionized water; the drying includes drying in a vacuum drying oven at a drying temperature of 60 - 80°C.

[0019] In a third aspect, the present invention also provides an application of the CoFe 2 O 4 @MoS 2 catalyst in activating PAA to degrade organic pollutants.

[0020] Furthermore, the application includes adding the CoFe 2 O 4 @MoS 2 catalyst and PAA into the wastewater containing organic pollutants for reaction. The ratio of the dosage of the CoFe 2 O 4 @MoS 2 catalyst to the concentration of PAA is (10 - 50) mg : (0.5 - 2.0) mM. In this ratio, the dosage of the CoFe 2 O 4 @MoS 2 catalyst converted to concentration is (0.1 - 1.0) g / L; preferably, the ratio of the concentration of the CoFe 2 O 4 @MoS 2 catalyst to the concentration of PAA is 0.3 g / L : 0.5 mM.

[0021] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0022] By compounding CoFe 2 O 4 with MoS 2 a novel CoFe 2 O 4 @MoS 2 composite material is prepared. This composite material has good magnetic separation performance and reusability, providing an efficient, environmentally friendly, and economical novel catalyst for environmental governance;

[0023] Compared with the individual CoFe 2 O 4 and MoS 2 the CoFe 2 O 4 @MoS 2 catalyst provided by the present invention requires less amount of catalyst and has a faster reaction rate when degrading the same organic pollutants; CoFe 2 O 4 @MoS 2 The catalyst has a stable structure, enabling it to maintain a high catalytic activity even after multiple cycles of use; its ability to resist high temperatures and acid-base environments has been improved, making it suitable for various water treatment conditions;

[0024] The present invention uses inexpensive and easily available raw materials, reducing the preparation cost of the catalyst, simplifying the synthesis process, and reducing energy consumption and environmental pollution during the production process;

[0025] The present invention applies the CoFe 2 O 4 @MoS 2 catalyst to the activation of PAA for degrading organic pollutants. The catalyst can more effectively activate PAA, generating more reactive oxygen species, thereby accelerating the degradation of organic pollutants; using PAA as an oxidant, it is non-toxic and harmless, and the degradation products are water and carbon dioxide, without secondary pollution to the environment. The catalyst can be recycled, reducing the generation of waste; this reaction system is not only applicable to the degradation of carbamazepine, but also can be applied to a variety of refractory biodegradable organic pollutants, such as antibiotics, dyes, etc.; it has good adaptability under different water quality conditions, including water bodies containing interfering substances such as inorganic anions. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 SEM images of MoS 2 nanosheets, CoFe 2 O 4 nanoparticles and CoFe 2 O 4 @MoS 2 prepared in Example 1; in the figure: (a) is MoS 2 nanosheets; (b) is CoFe 2 O 4 nanoparticles; (c) is CoFe 2 O 4 @MoS 2 prepared in Example 1;

[0027] Figure 2 CoFe 2 O 4 @MoS2 TEM image of

[0028] Figure 3 CoFe prepared for Example 1 2 O 4 @MoS 2 EDS spectrum of

[0029] Figure 4 Comparison chart of degradation curves of CBZ for different reaction systems;

[0030] Figure 5 Comparison chart of reaction rate constants for CBZ degradation in different reaction systems;

[0031] Figure 6 In the electron spin resonance detection using different experimental systems, comparison chart of the signal and activated species intensity changing with time; In the figure, (a) is the comparison chart of the signal intensity of DMPO-X changing with time in different experimental systems; (b) is the comparison chart of the signal intensity of DMPO-O 2 •− changing with time; (c) is the comparison chart of the signal intensity of TEMP- 1 O 2 changing with time; (d) is the comparison chart of the signal intensity of the above-mentioned activated species changing with time in the CoFe 2 O 4 @MoS 2 -PAA system;

[0032] Figure 7 Comparison chart of degradation curves of CBZ in the reaction system with different concentrations of SO 4 2- added as described in Example 5;

[0033] Figure 8 Comparison chart of degradation curves of CBZ in the reaction system with different concentrations of Cl - added as described in Example 5;

[0034] Figure 9 Comparison chart of degradation curves of CBZ in the reaction system with different concentrations of NO 3 - added as described in Example 5;

[0035] Figure 10 Comparison chart of degradation curves of CBZ in the reaction system with different concentrations of HCO 3 - added as described in Example 5;

[0036] Figure 11 CoFe described in Example 7 2O 4 @MoS 2 Comparison chart of the degradation rates of different organic pollutants by the catalyst. Detailed implementation manners

[0037] In the present invention, by compounding CoFe 2 O 4 nanoparticles with MoS 2 nanosheets, a highly efficient and stable composite catalyst is prepared. CoFe 2 O 4 , as a spinel-type ferrite material, has good magnetic properties and catalytic activity, while MoS 2 can significantly enhance the catalytic performance due to its high specific surface area and abundant active sites; the synergistic effect of the two can greatly improve the activation efficiency of PAA. In the experiment of degrading organic pollutants, the composite material is added to a solution containing target organic pollutants (such as carbamazepine, rhodamine B, phenol, etc.), an appropriate amount of PAA is added, the pH is adjusted to 3 - 5, and the reaction is carried out at 30°C for 1 hour to achieve efficient degradation. The experimental results show that this method has a significant degradation effect on a variety of organic pollutants, and the degradation rate is up to more than 95%. In addition, the composite material has good magnetic separation performance, can be conveniently recovered by applying an external magnetic field, and still maintains a high catalytic activity after being reused 5 times. In addition, the method of the present invention is environmentally friendly, the catalyst itself is non-toxic, and no secondary pollution is generated during the reaction, which conforms to the concept of green chemistry. Compared with traditional single catalysts, the CoFe 2 O 4 @MoS 2 composite material exhibits more excellent catalytic performance and can effectively overcome the deficiencies of single materials in terms of catalytic activity, stability, and reusability. In summary, the present invention provides a method for activating peracetic acid by a CoFe 2 O 4 @MoS 2 composite material to degrade organic pollutants, which has significant technical advantages and application values. This method not only provides a new technical means for the treatment of organic pollutants, but also provides a theoretical basis and practical reference for the development of new multifunctional composite catalysts.

[0038] The preferred embodiments of the present invention will be described in more detail below with reference to the accompanying drawings and specific examples.

[0039] Example 1

[0040] This example provides a CoFe 2 O 4 @MoS 2 catalyst, which is composed of CoFe 2 O 4 and MoS2 is composed of; among them, the MoS 2 is in a layered structure, and the CoFe 2 O 4 is in the form of nanoparticles and is distributed between the MoS 2 nanosheets; this structure can effectively combine the magnetism of CoFe 2 O 4 and the catalytic performance of MoS 2 .

[0041] The preparation method of the CoFe 2 O 4 @MoS 2 catalyst in this embodiment includes the following steps:

[0042] Dissolve 5 mM Co(NO 3 ) 2 ·6H 2 O and 5 mM Fe(NO 3 ) 2 ·9H 2 O in 200 mL of deionized water to prepare a mixed solution; then, add ammonia water to adjust the pH of the solution to 10 - 11;

[0043] Then add 10.558 g of MoS 2 nanosheets to the above mixed solution, ultrasonic for half an hour and then stir for one hour to obtain a reaction solution;

[0044] Subsequently, transfer the reaction solution to a hydrothermal reactor, react at 180 °C for 24 hours, collect the reaction product, and wash it three times with absolute ethanol and deionized water; finally, dry it in a vacuum drying oven to obtain the CoFe 2 O 4 @MoS 2 catalyst.

[0045] Characterize the prepared CoFe 2 O 4 @MoS 2 by SEM and TEM, and the results Figures 1 to 3 are shown.

[0046] From Figure 1 the scanning electron microscope images, it can be observed that (a) the MoS 2 nanosheets and (b) the CoFe 2 O 4 nanoparticles show a typical flower-like structure, and their sizes are about 1 and 2 μM, while in (c), it can be clearly found that CoFe 2 O 4 is uniformly dispersed in the MoS 2 nanosheets, proving that CoFe2 O 4 Loaded onto MoS 2 nanosheets, this structure is conducive to its more sufficient and efficient contact with the oxidant.

[0047] As Figure 2 shown, we further used TEM to observe the microstructure of CoFe 2 O 4 @MoS 2 It can be easily observed that the layered structure of MoS 2 and the CoFe 2 O 4 nanoparticles are distributed between the MoS 2 flakes, indicating that the surface characteristics of CoFe 2 O 4 @MoS 2 have changed slightly compared with those of pure MoS 2 . It is worth noting that both SEM and TEM images show that MoS 2 can still maintain a flaky structure with a smooth surface after loading CoFe 2 O 4 nanoparticles; it can also be seen that after loading CoFe 2 O 4 @MoS 2 , a large number of active sites are introduced, promoting the catalytic reaction of the CoFe 2 O 4 @MoS 2 hybrid structure.

[0048] As Figure 3 shown, the elemental distribution of the representative CoFe 2 O 4 @MoS 2 was further studied by TEM energy-dispersive spectroscopy. The results show that CoFe 2 O 4 @MoS 2 is composed of uniformly distributed Co, Fe, O, Mo, and S, indicating the successful preparation of the CoFe 2 O 4 @MoS 2 composite catalyst.

[0049] Example 2

[0050] This example provides a CoFe 2 O 4 @MoS 2 catalyst, with CoFe 2 O 4 as the core and MoS 2As the core, a core-shell structure is formed; this structure can effectively combine the magnetism of CoFe 2 O 4 and the catalytic performance of MoS 2 .

[0051] The preparation method of the CoFe 2 O 4 @MoS 2 catalyst in this example includes the following steps:

[0052] Dissolve 5 mM Co(NO 3 ) 2 ·6H 2 O and 10 mM Fe(NO 3 ) 2 ·9H 2 O in 200 mL of deionized water to prepare a mixed solution; then, add ammonia water to adjust the pH of the solution to 10 - 11;

[0053] Then add 10.558 g of MoS 2 nanosheets to the above mixed solution, ultrasonicate for half an hour and then stir for one hour to obtain a reaction solution;

[0054] Subsequently, transfer the reaction solution to a hydrothermal autoclave, react at 180 °C for 24 hours, collect the reaction product, and wash it three times with absolute ethanol and deionized water; finally, dry it in a vacuum drying oven to obtain the CoFe 2 O 4 @MoS 2 catalyst.

[0055] Example 3

[0056] This example provides a CoFe 2 O 4 @MoS 2 catalyst, with CoFe 2 O 4 as the core and MoS 2 as the shell to form a core-shell structure; this structure can effectively combine the magnetism of CoFe 2 O 4 and the catalytic performance of MoS 2 .

[0057] The preparation method of the CoFe 2 O 4 @MoS 2 catalyst in this example includes the following steps:

[0058] Dissolve 10 mM Co(NO 3 ) 2 ·6H 2O and 5 mM Fe(NO 3 ) 2 ·9H 2 O was dissolved in 200 mL of deionized water to prepare a mixed solution; subsequently, ammonia water was added to adjust the pH of the solution to 10 - 11;

[0059] Then 10.558 g of MoS 2 nanosheets were added to the above - mentioned mixed solution, and after ultrasonic treatment for half an hour and then stirring for one hour, a reaction solution was obtained;

[0060] Subsequently, the reaction solution was transferred to a hydrothermal reactor and reacted at 180 °C for 24 hours. The reaction products were collected and washed three times with absolute ethanol and deionized water; finally, they were dried in a vacuum drying oven to obtain CoFe 2 O 4 @MoS 2 catalyst.

[0061] Example 4

[0062] This example provides an application of CoFe 2 O 4 @MoS 2 catalyst in activating PAA to degrade organic pollutants.

[0063] 4.1: Degradation of organic pollutants by CoFe 2 O 4 @MoS 2 system

[0064] In this example, carbamazepine was taken as an example. Carbamazepine (CBZ) is an antiepileptic drug. Long - term use may cause central nervous system toxicity, blood system side effects, liver and kidney damage, allergic reactions and dependence. Long - term or excessive use requires caution, posing a serious threat to the aquatic environment and organisms. It is very necessary to study the degradation efficiency of the catalyst on CBZ.

[0065] In this example, the CoFe 2 O 4 @MoS 2 catalyst prepared in Example 1 was mixed with PAA for degrading CBZ. The specific steps are as follows:

[0066] 50 mg of CoFe 2 O 4 @MoS 2 catalyst was added to a 50 - mL reaction system containing 10 mg / L CBZ and 2.0 mM PAA;

[0067] The reaction was stirred at room temperature for 60 minutes, and samples were taken at regular intervals to measure the change in the concentration of organic pollutants;

[0068] The results showed that the degradation rates of various organic pollutants reached over 80% within 30 minutes.

[0069] Figure 4 It is the degradation diagram of CBZ in different reaction systems. As can be seen from the figure, within 30 minutes, the removal rate of CBZ by PAA alone was only 11.3%, indicating that the degradation effect of PAA itself on CBZ can be ignored; for the CoFe 2 O 4 @MoS 2 system, the removal rates of CBZ were only about 6.1% respectively, suggesting that the adsorption effect of the catalyst on CBZ was also very limited; in sharp contrast, the catalytic efficiency of the CoFe 2 O 4 @MoS 2 nano - composite was significantly improved, and CBZ in the experimental system could be completely removed; this result was mainly attributed to the fact that MoS 2 had strong adsorption sites on its surface, which was conducive to the rapid enrichment of CBZ molecules and promoted the catalytic process.

[0070] To better compare the reaction rates, the pseudo - first - order kinetic model was used to fit the degradation diagram of CBZ. The reaction rate constants of each reaction system were as Figure 5 shown. As can be seen from the figure, the rate constant of the CoFe 2 O 4 @MoS 2 -PAA system was 0.0323 min -1 , which was 1.97 times and 2.17 times that of the CoFe 2 O 4 -PAA system (0.0164 min -1 ) and the MoS 2 -PAA system (0.0149 min -1 ) respectively. The above results indicated that the synergistic effect of CoFe 2 O 4 and MoS 2 could improve the activation efficiency of PAA, laying a foundation for its application in the purification of polluted wastewater.

[0071] 4.2: Identification of reactive species in the CoFe 2 O 4 @MoS 2 system

[0072] The degradation pathways of pollutants in the PAA activation system are mainly divided into two categories: free - radical pathways (HO • and O 2 •− ) and non - free - radical pathways ( 1O 2 and organic free radicals).

[0073] To determine the reactive oxygen species generated by the CoFe 2 O 4 @MoS 2 -PAA system during the degradation of CBZ, electron spin resonance technology was used to detect different reaction systems, and the results are as Figure 6 shown. As can be seen from Figure 6 (a) and (b), when DMPO was used as a scavenger, obvious DMPO-X and DMPO-O 2 O 4 @MoS 2 -PAA system showed the signals of DMPO-X and DMPO-O 2 •− adducts; in addition, Figure 6 the 1:1:1 triple signal in (c) was in good agreement with the characteristic peak of the TEMP- 1 O 2 adduct; as time went by, the intensities of these signals gradually decreased, which might be due to the gradual consumption of PAA, as Figure 6 (d) showed. The above results indicate that HO • 、O 2 •− and 1 O 2 played important roles in the degradation of CBZ.

[0074] Example 5

[0075] This example provides an application of the CoFe 2 O 4 @MoS 2 catalyst in activating PAA to degrade organic pollutants. The specific method is as follows: Repeat the steps of Example 4, but add inorganic anions SO 4 2- 、Cl - 、NO 3 - and HCO 3 - with different concentrations (0.5 mM, 1.0 mM, 2.0 mM) to the reaction system respectively, and the results are as Figures 7 to 10 shown.

[0076] The results show that the CoFe 2 O 4 @MoS 2 catalyst can still maintain high catalytic activity under the condition of containing inorganic anions, and the degradation rate of CBZ remains above 85%.

[0077] Example 6

[0078] This example provides an application of CoFe 2 O 4 @MoS 2 catalyst in activating PAA to degrade organic pollutants. The specific method is as follows: Repeat the steps of Example 4, and recycle the catalyst after the reaction for the next experiment.

[0079] The results show that CoFe 2 O 4 @MoS 2 catalyst can still maintain high catalytic activity in five consecutive cycle experiments, and the degradation rate of CBZ remains above 80%.

[0080] Example 7

[0081] This example provides an application of CoFe 2 O 4 @MoS 2 catalyst in activating PAA to degrade other organic pollutants. The specific method is as follows: Repeat the steps of Example 4, but add other organic pollutants to the reaction system respectively, including: ciprofloxacin (CIP), sulfamethoxazole (SMX), phenol (Phenol) and ibuprofen (IBU). The comparison results of their degradation effects with carbamazepine (CBZ) are as Figure 11 shown. The results show that CoFe 2 O 4 @MoS 2 catalyst has high catalytic activity for the degradation of other organic pollutants, and their degradation rates remain above 85%.

[0082] The above has described the embodiments of the present invention. The above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Without departing from the scope and technical principles of the described embodiments, many modifications and changes are obvious to those of ordinary skill in the art, and these modifications and changes should also be regarded as the protection scope of the present invention.

Claims

1. A CoFe2O4@MoS2 catalyst, characterized in that: The catalyst is composed of a composite of CoFe2O4 and MoS2; wherein the MoS2 is a layered structure, and the CoFe2O4 is nanoparticles distributed between MoS2 flakes.

2. A method for preparing the CoFe2O4@MoS2 catalyst according to claim 1, characterized in that: include: Dissolve Co(NO3)2·6H2O and Fe(NO3)2·9H2O in deionized water to prepare a CoFe2O4 mixed solution, and adjust the pH value to 10-11; Adding MoS2 nanosheets to the mixed solution, mixing and dispersing them uniformly to obtain a reaction solution; The reaction solution is placed in a reaction container for hydrothermal reaction. After the reaction is completed, the CoFe2O4@MoS2 catalyst is obtained.

3. The method for preparing the CoFe2O4@MoS2 catalyst according to claim 2, characterized in that: The molar ratio of Co(NO3)2·6H2O to Fe(NO3)2·9H2O is 1:(0.5~2.0).

4. The method for preparing the CoFe2O4@MoS2 catalyst according to claim 2, characterized in that: The pH value is adjusted by adding an alkaline pH adjuster, and the alkaline pH adjuster includes ammonia water or sodium hydroxide solution.

5. The method for preparing the CoFe2O4@MoS2 catalyst according to claim 2, characterized in that: The mass ratio of MoS2 to CoFe2O4 is (10.0~1.0):

1.

6. The method for preparing the CoFe2O4@MoS2 catalyst according to claim 2, characterized in that In, The process parameters for mixing and dispersing the MoS2 nanosheets in the mixed solution are: ultrasonication for 20 to 40 minutes, and then stirring for 1 to 2 hours.

7. The method for preparing the CoFe2O4@MoS2 catalyst according to claim 2, characterized in that: The conditions of the hydrothermal reaction are a temperature of 180° C. to 200° C., a reaction time of 20 to 30 hours, and a pressure of 1.0 to 1.5 MPa.

8. The method for preparing the CoFe2O4@MoS2 catalyst according to claim 2, characterized in that: It also includes cleaning and drying after the reaction is completed; The cleaning comprises first cleaning with anhydrous ethanol for 2 to 4 times, and then cleaning with deionized water for 2 to 4 times; And / or, the drying includes drying in a vacuum drying oven at a drying temperature of 60-80°C.

9. Use of the CoFe2O4@MoS2 catalyst according to claim 1 in activating PAA to degrade organic pollutants.

10. The use of the CoFe2O4@MoS2 catalyst according to claim 9 in activating PAA to degrade organic pollutants, characterized in that: include: The CoFe2O4@MoS2 catalyst and PAA are added to wastewater containing organic pollutants for reaction; the ratio of the amount of the CoFe2O4@MoS2 catalyst to the PAA concentration is (10-50) mg: (0.5-2.0) mM.

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