MoS2 nanowire as well as synthesis method and application thereof

Abstract

The invention discloses a MoS2 nanowire as well as a synthesis method and application thereof, and belongs to the technical field of one-dimensional nano material synthesis. The preparation method is based on the fact that Mn < 2 + > and MoO4 < 2-> can form MnMoO4 nanowire precipitates. The MnxMoyS2 composite sulfide nanowire can be obtained by vulcanizing MnMoO4, wherein the stoichiometric number x and the stoichiometric number y both range from 0.8 to 0.9. After acid treatment, the MnS phase can be removed, and the MoS2 nanowire is obtained. The MoS2 nanowires synthesized by the method have abundant active boundaries, and the photocatalytic performance of the MoS2 nanowires is higher than that of commercial MoS2 nanomaterials. The synthesis method has the advantages of simple process, low raw material cost, high nanowire yield, uniform diameter distribution, recoverable waste liquid ions and the like, can be used for large-scale synthesis of MoS2 nanowires, and is convenient for industrial production.

Description

Technical Field

[0001] The present invention belongs to the field of one-dimensional nanomaterial synthesis, and specifically relates to a MoS2 nanowire, a synthesis method and an application thereof. Background Art

[0002] MoS2 is an important transition metal sulfide that belongs to the family of two-dimensional layered materials. Its unique physical and chemical properties give it great application potential in many fields, including catalysis, energy storage and conversion, electronic devices, optoelectronic devices, lubricants, and biosensors. Early research focused on the application of bulk MoS2 as a solid lubricant. With the rise of nanoscience and technology, it has been discovered that exfoliating or synthesizing MoS2 into low-dimensional structures such as thin films, nanosheets, nanotubes, and nanowires can significantly alter its electronic structure and surface area, thereby greatly improving its performance.

[0003] The layered structure of MoS2 consists of S-Mo-S sandwich units stacked by van der Waals forces. Bulk MoS2 typically exhibits low catalytic activity in catalytic reactions, primarily due to its inert basal plane. Studies have shown that the catalytic activity of MoS2 primarily originates from its edge sites—unsaturated coordination sites that expose Mo and S atoms. These edge sites provide abundant active centers for the efficient adsorption and conversion of reactants. For example, in important catalytic processes such as hydrodesulfurization (HDS) and the hydrogen evolution reaction (HER), MoS2 edge active sites play a key role. Therefore, increasing the exposed edge fraction of MoS2 materials is an effective approach to improving their catalytic performance. Consequently, effectively exposing more edge sites has become a key approach to enhancing MoS2 performance. Reducing the material size, constructing nanostructures, and epitaxial growth on substrates can all increase the number of exposed edges.

[0004] Nanowires, as a typical one-dimensional nanostructure, have a high aspect ratio and a large specific surface area. Constructing MoS2 into a nanowire structure can effectively increase the exposed area of ​​the active edge while maintaining a good charge transfer path. MoS2 nanowires not only inherit the excellent properties of MoS2 itself, but also, through their unique morphological advantages, exhibit better performance than bulk or ordinary nanoparticles in fields such as catalysis and energy storage. Currently, the methods for synthesizing MoS2 nanowires mainly include chemical vapor deposition (CVD), hydrothermal / solvothermal methods, electrospinning combined with sulfurization, and template methods. For example, a one-dimensional template (such as carbon nanotubes, alumina membrane pores, etc.) is used as a growth substrate to grow MoS2 inside or on the surface of the template, thereby obtaining MoS2 nanowires with the template morphology.

[0005] Although some methods for synthesizing MoS2 nanowires have been reported, they still face some challenges, such as how to achieve high-yield, low-cost, and large-scale preparation. Therefore, the development of new and efficient methods for synthesizing MoS2 nanowires has important research significance and practical application value. Summary of the Invention

[0006] The present invention discloses a MoS2 nanowire, a synthesis method and an application thereof. 2+ Ions can react with MoO4 2- ions form MnMoO4 nanowires. Mn can be obtained by sulfiding MnMoO4. x Mo y S2 composite sulfide nanowires, in which the stoichiometric x and y The MnS phase is removed by acid treatment, yielding MoS nanowires. The MoS nanowires synthesized by this method exhibit abundant active boundaries and exhibit photocatalytic performance far superior to commercial MoS nanomaterials. This synthesis method offers advantages such as simplicity, low raw material costs, high nanowire yield, uniform diameter distribution, and recyclable waste liquid ions. It can be used for large-scale synthesis of MoS nanowires, facilitating industrial production.

[0007] A method for synthesizing MoS2 nanowires comprises the following steps: (1) Prepare Mn 2+ Solution, MoO4 2- The solution was stirred and then added to MoO4 2- Add Mn dropwise to the solution 2+ solution to obtain a suspension containing MnMoO4 nanowires, and then obtain MnMoO4 nanowire powder by suction filtration, washing and drying; (2) The MnMoO4 nanowire powder obtained in step (1) is placed in a crucible, and sulfur powder is placed in another crucible; the two crucibles are placed in two temperature zones of a dual-temperature zone tubular furnace, and the sulfur powder is located in the first temperature zone and upstream of the gas path; the heating program of the two temperature zones is set, and it is ensured that the two temperature zones reach the highest target temperature at the same time. Argon gas is continuously introduced during the heating process, and the sulfur vapor in the upstream will be carried to the downstream MnMoO4 nanowire by the argon gas, and then react with MnMoO4 to generate Mn x Mo y S2 nanowires; (3) The Mn obtained in step (2) x Mo y The S2 nanowires are placed in an acid solution to undergo etching reaction to remove the MnS phase, and finally the precipitate is filtered, washed, and dried to obtain MoS2 nanowire powder.

[0008] Furthermore, in step (1), Mn2+ The source is the corresponding water-soluble and ionized Mn 2+ The compound is specifically at least one of manganese chloride, manganese sulfate, manganese nitrate and manganese acetate.

[0009] Furthermore, in step (1), MoO4 2- The source is soluble in water and ionized to MoO4 2- The compound is specifically at least one of lithium molybdate, sodium molybdate, potassium molybdate and ammonium molybdate.

[0010] Furthermore, in step (1), Mn 2+ Solution, MoO4 2- The ion concentration in the solution is 0.1~1mol / L; Mn 2+ solution and MoO4 2- The volume ratio of the solution is determined based on the principle that the total molar number of the two ions is equal.

[0011] Furthermore, in step (1), the drying temperature is 80-120° C., and the drying time is 5-10 hours.

[0012] Furthermore, in step (2), the mass ratio of MnMoO4 nanowire powder to sulfur powder is 1:(1-5); and the distance between the two alumina ceramic crucibles is 20-30 cm.

[0013] Furthermore, in step (2), the maximum target temperature of the second temperature zone where the MnMoO4 nanowire powder is located is 950~1000℃, the heating rate and the holding time are 5~10℃ / min and 20~40 minutes respectively; the maximum target temperature of the first temperature zone where the sulfur powder is located is 220~300℃, the heating rate and the holding time are 5~10℃ / min and 20~40 minutes respectively; and the argon gas flow rate is 50~150sccm.

[0014] Furthermore, in step (3), the acid solution used is an acid solution that can ionize H + The substance is specifically at least one of hydrochloric acid, sulfuric acid, nitric acid, citric acid and acetic acid, and the concentration should not be too high, and the concentration should be equal to or less than 0.5 mol / L.

[0015] Furthermore, in step (3), the acid solution treatment time is 100 to 180 minutes; the temperature required for drying is 80 to 120° C., and the drying time is 5 to 10 hours.

[0016] The present invention provides MoS2 nanowires synthesized by the above method.

[0017] The present invention also provides the use of the above-mentioned MoS2 nanowires in the degradation of rhodamine B.

[0018] Compared with the existing synthesis method, the beneficial effects of the present invention are as follows: (1) Simple process: The parameters that affect the synthesis of nanowires are mainly affected by the sulfurization temperature and the concentration of the acid solution. Therefore, the preparation conditions of this technology are easy to control, the repetition rate is high, and the equipment requirements are low.

[0019] (2) High yield: Mn 2+ Ions can react with MoO4 at room temperature 2- ions form MnMoO4 nanowires with uniform diameter distribution. After sulfurization, most of the Mn is intercalated between the MoS2 layers. Acid treatment removes a significant amount of Mn and MnS phases, ensuring that the prepared MoS2 nanowires are morphologically intact and have diameters roughly consistent with those of MnMoO4 nanowires. Under the preparation conditions, no distinct MoS2 nanosheets were observed; the MoS2 exists entirely in the form of nanowires with good directionality.

[0020] (3) High technical and economic benefits: The precursors required for preparation are green, environmentally friendly and safe, and the etching process only requires ionizable H + Acidic compounds, the final waste liquid contains Mn 2+ ions, MoO4 can be added dropwise 2- ions to synthesize MnMoO4 nanowires again, thereby realizing Mn in wastewater 2+ The recycling and reuse of ions improves economic benefits and reduces environmental pollution.

[0021] (4) Strong controllability: By adjusting the concentration of the acid solution, the etching rate of MnS and the generation rate of H2S gas can be changed, thereby changing the morphology of MoS2 and realizing the flexible and controllable synthesis of one-dimensional MoS2 nanowires and two-dimensional MoS2 flakes.

[0022] (5) Good product performance: Compared with commercial MoS2 nanosheets, the one-dimensional MoS2 nanowires prepared by this method have better photocatalytic performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The present invention is further described with reference to the accompanying drawings, but the contents in the accompanying drawings do not constitute any limitation to the present invention.

[0024] Figure 1 Schematic diagram of the steps for synthesizing one-dimensional MoS2 nanowires.

[0025] Figure 2 It is the XRD spectrum of the samples obtained in different steps of Example 1.

[0026] Figure 3 It is the SEM image of MnMoO4 and MoS2 synthesized in Example 1.

[0027] Figure 4Statistically obtained diameter distribution (histogram) and Gaussian fitting results (dashed line) of the MnMoO4 and MoS2 nanowires synthesized in Example 1.

[0028] Figure 5 This is the SEM image of the MoS2 nanowires synthesized in Example 1 on a silicon substrate and the corresponding element distribution.

[0029] Figure 6 These are TEM images of different positions of a single nanowire synthesized in Example 1 and the corresponding local magnified images.

[0030] Figure 7 The Mn synthesized in Example 1 x Mo y EDS elemental spectra of S2 and MoS2 nanowires.

[0031] Figure 8 These are the DFT calculation results of Mn intercalation at different positions between MoS2 layers.

[0032] Figure 9 This is the XRD spectrum of the product synthesized at different temperatures in the second temperature zone in Example 2.

[0033] Figure 10 This is a SEM image of the MoS2 sample obtained after sulfurization temperature of 1050°C and acid treatment in Example 2.

[0034] Figure 11 This is a SEM image of the MoS2 nanomaterial obtained by treating with a 0.7 mol / L sulfuric acid solution in Example 3.

[0035] Figure 12 These are the experimental results of visible light degradation of RhB solution. DETAILED DESCRIPTION

[0036] The present invention is further described below with reference to specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention. After reading the present invention, modifications of various equivalent forms of the present invention made by those skilled in the art all fall within the scope defined by the claims attached to this application.

[0037] Example 1: Synthesis method of one-dimensional MoS2 nanowires. Figure 1 Schematic diagram of the synthesis steps. The specific operations are as follows: (1) Weigh 1.03 g Na2MoO4 (molecular weight 205.9, 5 mmol) and 0.99 g MnCl4.4H2O (molecular weight 197.91, 5 mmol) and pour them into two 500 mL beakers respectively. Then add 100 mL of deionized water and sonicate to completely dissolve the powders, thereby obtaining the MoO4 2- and Mn2+ The solution will contain MoO4 2- Place the solution on a magnetic stirrer and add a rotor, set the speed to 200 rpm. Use a 5 mL dropper to add MoO4 2- Slowly add Mn 2+ Solution, MoO4 2- Light yellow MnMoO4 precipitate quickly appears in the solution, and the solution is added dropwise until all the Mn is used up. 2+ The suspension was poured into a suction filtration device and filtered for 60 minutes, and washed three times with deionized water. The collected product was then dried in a drying oven at 100°C for 6 hours to obtain yellow MnMoO4 nanowire powder.

[0038] (2) Weigh 0.5g of MnMoO4 nanowire powder and 1g of sulfur powder and place them in two alumina ceramic crucibles respectively, spread them evenly, and place the two alumina ceramic crucibles containing samples in a dual-temperature zone tube furnace, with the ceramic crucibles located in the center of the temperature zones and 25cm apart. The crucible containing MnMoO4 nanowire powder is located in the second temperature zone and downstream of the gas path, while the crucible containing sulfur powder is placed in the first temperature zone and upstream of the gas path. Set the target maximum temperature of the second temperature zone to 1000℃, the heating rate and holding time to 10℃ / min and 30 minutes respectively; set the maximum temperature of the first temperature zone to 270℃, the heating rate and holding time to 10℃ / min and 30 minutes respectively, and ensure that both temperature zones reach the maximum temperature at the same time. During the preparation process, 80sccm of argon is continuously introduced as a carrier gas. When the temperature of the two temperature zones drops below 150℃, the argon supply is stopped, the tube furnace is closed, and the samples are removed. During the heating process, the sulfur powder sublimates and is carried to the MnMoO4 by the carrier gas and reacts with it to form Mn x Mo y S2 sulfide nanowires.

[0039] (3) Add concentrated sulfuric acid to deionized water and dilute to obtain a 0.2 mol / L sulfuric acid solution. Measure 100 mL of 0.2 mol / L sulfuric acid solution and pour it into a 250 mL beaker. Weigh 200 mg of Mn x Mo y The S2 powder was slowly poured into a 0.2 mol / L sulfuric acid solution and etched for 120 minutes. The precipitated solution was then filtered and dehydrated for 60 minutes. 60 mL of deionized water was then added and the dehydration process continued. The deionized water washing and dehydration process was repeated three times. The final product was placed in a Petri dish and dried in a forced air drying oven at 80°C for 8 hours to obtain clean MoS2 nanowire powder.

[0040] Figure 2The X-ray diffraction (XRD) patterns of the samples obtained in the three steps of the preparation process are shown in Figure 2. According to the standard diffraction data of MnMoO4 (JCPDS: 72-0285), MoS2 (JCPDS: 73-1508), and MnS (JCPDS: 72-1534), the products of step (1), step (2), and step (3) are MnMoO4, MoS2 containing MnS phase, and single phase MoS2, respectively. Diffraction peaks and corresponding standard spectra Figure 1 The results show that MnMoO4 and composite sulfide Mn x Mo y After three steps, the final product is a single hexagonal phase of MoS2 without any impurities. The narrow diffraction peak indicates that the synthesized MoS2 has high crystalline quality.

[0041] Figure 3 Scanning electron microscope (SEM) images of synthesized MnMoO4 and MoS2. Both materials have nanowire structures, indicating that the samples can maintain the nanowire structure after sulfurization and acid treatment. Figure 4 The diameter distribution histograms of the MnMoO4 and MoS2 nanowires show a concentrated distribution. Gaussian fitting reveals that the average diameters of the MnMoO4 and MoS2 nanowires are ~155 nm and ~159 nm, respectively, further demonstrating that sulfurization and acid treatment have little effect on the nanowire structure. Figure 5 Figure 2 is the SEM image of two MoS2 nanowires on a silicon substrate and the corresponding element distribution. It can be seen that the Mo and S elements are evenly distributed and a small amount of Mn element is doped in the nanowires.

[0042] The microstructure of MoS2 nanowires was characterized by transmission electron microscopy (TEM). Figure 6 TEM images of different locations on a single nanowire and corresponding zoomed-in images. The ~0.63 nm spacing of the lattice fringes in the images corresponds to the (002) plane of MoS2. The consistent lattice fringes indicate that the synthesized MoS2 nanowires possess good orientation, ensuring sufficient exposure of the active edges.

[0043] Figure 7 For the synthesis of Mn x Mo y Energy dispersive spectroscopy (EDS) elemental spectra of S2 and MoS2 nanowires, it can be calculated that Mn x Mo y The atomic ratio of Mn, Mo, and S in S2 is 1.03:1:2.46, while the atomic ratio of Mn, Mo, and S in MoS2 is 0.06:1:1.88. According to the XRD results and the above element ratios, it can be seen that Mn x Mo y There is a small amount of MnS phase in S2, while most of the Mn is located in the Mnx Mo y An intercalation structure is formed between the layers of MoS2 in S2, and a small amount of Mn doping exists in the finally synthesized MoS2 nanowires. Figure 8 The density functional theory (DFT) calculation results of Mn intercalated at different positions between MoS2 layers. The position and atomic structure diagram marked by symbol ① are unintercalated MoS2. According to symmetry, there are two possible interlayer intercalation positions for Mn (marked by symbols ② and ③). By comparison, it can be seen that in theory, Mn intercalation will not lead to a large change in the interlayer spacing of MoS2, and will lead to a decrease in the system energy, indicating that Mn can easily form an intercalation structure in MoS2. However, Mn x Mo y The small amount of MnS phase separation and Mn intercalation in S2 make the morphology of the synthesized MoS2 nanowires basically consistent with that of the MnMoO4 nanowire precursor. Therefore, the synthesis of MoS2 nanowires by this method is mainly due to the nanowire morphology of the MnMoO4 precursor and the Mn after sulfurization. x Mo y A large amount of Mn in S2 is located between the layers of MoS2 phase.

[0044] Example 2: Selection of the temperature of the second temperature zone The synthesis steps and conditions are basically the same as those for the synthesis of one-dimensional MoS2 nanowires (Example 1), except that the maximum temperature in the second temperature zone of step (2) is set to 600°C, 650°C, 700°C, 750°C, 800°C, 850°C, 900°C, 950°C, and 1050°C.

[0045] Figure 9 The XRD pattern of the product obtained by sulfurization in step (2) is shown in Figure 2. According to the standard diffraction data of MnMoO4 (JCPDS: 72-0285), MoS2 (JCPDS: 73-1508), and MnS (JCPDS: 72-1534), it can be seen that MnMoO4 can be completely converted into Mn when the sulfurization temperature is ≥950℃. x Mo y S2, but when the sulfurization temperature is ≤900℃, some MnMoO4 phase exists in the sulfurized product, indicating that the sulfurization at this temperature is insufficient and not suitable for synthesizing the target product. Figure 10 This SEM image shows a MoS2 sample obtained at a sulfurization temperature of 1050°C and after acid treatment. It shows that the inability to obtain well-formed MoS2 nanowires at this temperature is likely due to the melting of the MnMoO4 precursor at the higher synthesis temperature. At 1050°C, the MnMoO4 melts and agglomerates, disrupting the nanowire morphology of the final MoS2 product.

[0046] This example studies the effect of the temperature in the second temperature zone on the vulcanization product and the final target product. Analysis shows that the vulcanization temperature must be ≥950°C and <1050°C.

[0047] Example 3: Effect of acid solution concentration on product The synthesis steps and conditions are basically the same as those for the synthesis of one-dimensional MoS2 nanowires (Example 1), except that the concentration of the sulfuric acid solution in step (3) is set to 0.7 mol / L. MoS2 nanomaterials can also be obtained under these conditions.

[0048] Figure 11 The SEM image of the prepared MoS2 nanomaterials. x Mo y S2 can produce MoS2 thin nanosheets. This is mainly due to the presence of H in the acid solution. + ions and Mn x Mo y MnS in the S2 phase reacts to generate H2S gas. + The concentration increases dramatically. At higher concentrations, the acid solution reacts rapidly with MnS to produce H₂S gas, which dissociates the MoS₂ interlayers and causes a transformation of the MoS₂ nanostructure. Consequently, MoS₂ nanowires with well-defined morphologies are not obtained, and the acid solution concentration must be controlled.

[0049] This example studies the effect of acid solution concentration on the morphology of the target product MoS2. It can be seen that the higher the concentration of acid solution, the better the morphology of the target product MoS2. x Mo y S2 can be used to prepare MoS2 thin layer nanosheets.

[0050] Application Example 1: Comparison of Photocatalytic Performance The degradation performance of synthesized MoS2 nanowires in rhodamine B (RhB) under visible light (Vis) irradiation was evaluated. Rhodamine B is a commonly used organic dye, widely used in the textile, papermaking, and printing industries. However, Rhodamine B and its degradation products are potentially toxic and carcinogenic, posing a threat to aquatic life and human health. Traditional water treatment methods often struggle to efficiently and completely remove Rhodamine B. Therefore, photocatalytic degradation of Rhodamine B is of great significance for addressing dye wastewater pollution, protecting the environment, and protecting human health. In the experiment, 60 mg of the nanomaterial sample prepared in Example 1 or commercial MoS2 nanoflakes (Aladdin-M196565; diameter: 0.2-10 μm; number of layers: 1-10) were added to 60 mL of an aqueous solution containing RhB (RhB concentration: 30 mg / L). The solution was stirred in the dark for 30 minutes to achieve adsorption-desorption equilibrium. A xenon lamp (300 W) with a 420 nm long-pass filter was then used as the visible light source for the photocatalytic experiments.

[0051] Figure 12 Figure a shows the absorption spectra of RhB solutions under different conditions. The peak in the 450-600 nm band is associated with the light absorption of RhB in aqueous solution. Therefore, the peak intensity can be used to determine the RhB concentration in the solution. The spectra show that the RhB concentration in the solution decreases with darkness and prolonged illumination. Figure 12 Figure (b) shows the temporal variation of the absorption peak intensity at ~550 nm. Compared to commercial MoS2 nanoflakes (Aladdin-M196565; diameter: 0.2-10 μm; number of layers: 1-10), the MoS2 nanowires synthesized using this method exhibit superior adsorption of RhB in dark field analysis due to the nanowires' increased absorption sites. Under visible light irradiation, the absorbance of the RhB solution prepared with commercial MoS2 nanoflakes showed little change over time, indicating poor catalytic activity. The slight increase in absorbance is primarily due to water evaporation caused by light. In contrast, the MoS2 nanowire sample significantly decreased the absorbance of the solution, indicating a reduction in RhB in the solution. After 120 minutes of visible light irradiation, the MoS2 nanowire sample degraded 99.5% of RhB.

[0052] Photocatalytic processes typically involve the separation and migration of photogenerated electron-hole pairs, followed by redox reactions with reactants at active sites on the catalyst surface. For MoS2, different crystallographic surfaces exhibit distinct atomic arrangements and electronic structures, resulting in varying catalytic activities. Studies have shown that the activity of MoS2 is primarily concentrated at its edge sites, rather than the larger basal plane. Edge sites, where Mo and S atoms have numerous dangling bonds and unsaturated coordination, possess higher surface energy and chemical reactivity, making them more receptive to adsorption of RhB molecules. Furthermore, edge sites of MoS2 are considered to be efficient pathways for the transfer of photogenerated charge carriers (electrons and holes) from the bulk to the surface. Photoexcited electrons and holes can more efficiently migrate to edge sites, reducing recombination and improving carrier utilization. These edge-enriched electrons and holes can generate highly reactive radicals such as superoxide radicals (•O⁻) and hydroxyl radicals (•OH), effectively degrading RhB molecules. Therefore, the MoS2 nanowires synthesized by this method possess abundant active sites, resulting in excellent photocatalytic performance.

[0053] Although preferred embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative work shall fall within the scope of protection of the present invention.

Claims

1. A method for synthesizing MoS2 nanowires, characterized in that: The process is as follows: (1) Prepare Mn 2+ Solution, MoO4 2- The solution was stirred and then added to MoO4 2- Add Mn dropwise to the solution 2+ solution to obtain a suspension containing MnMoO4 nanowires, and then obtain MnMoO4 nanowire powder by suction filtration, washing and drying; (2) The MnMoO4 nanowire powder obtained in step (1) is placed in a crucible, and sulfur powder is placed in another crucible; the two crucibles are placed in two temperature zones of a dual-temperature zone tubular furnace, and the sulfur powder is located in the first temperature zone and upstream of the gas path; the heating program of the two temperature zones is set, and it is ensured that the two temperature zones reach the highest target temperature at the same time. Argon gas is continuously introduced during the heating process, and the sulfur vapor in the upstream will be carried to the downstream MnMoO4 nanowire by the argon gas, and then react with MnMoO4 to generate Mn x Mo y S2 nanowires; (3) The Mn obtained in step (2) x Mo y The S2 nanowires are placed in an acid solution to undergo etching reaction to remove the MnS phase, and finally the precipitate is filtered, washed, and dried to obtain MoS2 nanowire powder.

2. The method for synthesizing MoS2 nanowires according to claim 1, wherein: In step (1), Mn 2+ The source is at least one of manganese chloride, manganese sulfate, manganese nitrate and manganese acetate.

3. The method for synthesizing MoS2 nanowires according to claim 1, wherein: In step (1), MoO4 2- The source is at least one of lithium molybdate, sodium molybdate, potassium molybdate and ammonium molybdate.

4. The method for synthesizing MoS2 nanowires according to claim 1, wherein: In step (1), Mn 2+ Solution, MoO4 2- The average ion concentration in the solution is 0.1~1mol / L; Mn 2+ solution and MoO4 2- The volume ratio of the solution is determined based on the principle that the total molar number of the two ions is equal.

5. The method for synthesizing MoS2 nanowires according to claim 1, wherein: In step (2), the mass ratio of MnMoO4 nanowire powder to sulfur powder is 1: (1-5); the distance between the two crucibles is 20-30 cm.

6. The method for synthesizing MoS2 nanowires according to claim 1, wherein: In step (2), the maximum target temperature of the second temperature zone where the MnMoO4 nanowire powder is located is 950~1000℃, the heating rate and the holding time are 5~10℃ / min and 20~40 minutes respectively; the maximum target temperature of the first temperature zone where the sulfur powder is located is 220~300℃, the heating rate and the holding time are 5~10℃ / min and 20~40 minutes respectively; the argon gas flow rate is 50~150sccm.

7. The method for synthesizing MoS2 nanowires according to claim 1, wherein: In step (3), the acid solution used is at least one of hydrochloric acid, sulfuric acid, nitric acid, citric acid and acetic acid, and the concentration of the acid solution must be less than or equal to 0.5 mol / L.

8. The method for synthesizing MoS2 nanowires according to claim 1, wherein: In step (3), the acid solution treatment time is 100 to 180 minutes; the temperature required for drying in steps (1) and (3) is 80 to 120° C., and the drying time is 5 to 10 hours.

9. MoS2 nanowires synthesized by the method according to any one of claims 1 to 8.

10. Use of the MoS2 nanowires according to claim 9 in the degradation of rhodamine B.

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