A molybdenum disulfide-cationic polyelectrolyte-molybdate composite nanomaterial, a preparation method and application thereof

Abstract

This invention provides a molybdenum disulfide-cationic polyelectrolyte-molybdate composite nanomaterial, its preparation method, and its application as a slow-release fertilizer or antibacterial material. It relates to the field of nanocomposite materials. The method includes: adding a cationic polyelectrolyte to a MoS2 dispersion and dispersing it uniformly to obtain a dispersion; centrifuging the dispersion to obtain a solid; redispersing the solid in a cationic polyelectrolyte solution, centrifuging, and obtaining another solid; redissolving the solid in a molybdate-containing solution, centrifuging, and obtaining another solid; repeating the above steps as needed to obtain the composite nanomaterial. This invention utilizes layer-by-layer technology to enable electrostatic adsorption and coordination between the polycation and molybdate, constructing a "MoS2-polycation-molybdate" ternary slow-release structure, achieving the slow release of molybdenum and overcoming the technical difficulties of poor dispersibility and stability of molybdenum disulfide composites.

Description

Technical Field

[0001] This invention relates to the field of nanocomposite materials and agricultural fertilizers, specifically to a molybdenum disulfide-cationic polyelectrolyte-molybdate composite nanomaterial, its preparation method, and its application as a slow-release fertilizer or antibacterial material. Background Technology

[0002] Molybdenum is an essential micronutrient for plant growth, especially significant in promoting biological nitrogen fixation in legumes. Currently, molybdenum fertilizers are mainly applied in solid or liquid suspension forms. Solid fertilizers, when applied, can lead to uneven fertilization due to scattering, and their release rate is greatly affected by soil moisture. While liquid suspension fertilizers solve the absorption efficiency problem, they suffer from uneven release, poor stability, and easy sedimentation. Molybdenum disulfide (MoS2), as a layered nanomaterial, has the potential for slow-release of molybdenum, but its poor dispersibility and tendency to aggregate in solution limit its application in agriculture.

[0003] Therefore, it is of great significance to develop a nanocomposite molybdenum fertilizer with good dispersibility, stability and slow-release function. Summary of the Invention

[0004] This invention addresses the aforementioned problems in the prior art by providing a molybdenum disulfide-cationic polyelectrolyte-molybdate composite nanomaterial, its preparation method, and its application, thereby solving the problems of rapid release, poor stability, and low utilization rate of existing molybdenum fertilizers.

[0005] The technical solution of the present invention to solve the above-mentioned technical problems is as follows: On one hand, the present invention provides a method for preparing molybdenum disulfide-cationic polyelectrolyte-molybdate composite nanomaterials, characterized by comprising the following steps: S1. Add cationic polyelectrolyte to the MoS2 dispersion and disperse evenly to obtain the dispersion; S2. Centrifuge the dispersion and collect the solids; S3. Redisperse the solid in a cationic polyelectrolyte solution, centrifuge, and collect the solid. S4. Redissolve the solid in a solution containing molybdate, centrifuge, and obtain the solid. Steps S3 and S4 are performed at least once to obtain composite nanomaterials.

[0006] Furthermore, the cationic polyelectrolyte is polyethyleneamine, polyethyleneimine, polydiallyldimethylammonium chloride (PDDA), polylysine, polydimethylaminoethyl methacrylate, polymethacryloyloxyethyltrimethylammonium chloride, poly(4-vinylpyridine) quaternary ammonium salt, polyepoxychloropropane-dimethylamine, or poly(dimethylaminopropylacrylamide).

[0007] Furthermore, the molybdate ion is derived from molybdic acid or its cation salt, and the molybdic acid is derived from H₂MoO₄ or MoO₄. 2- Mo2O7 2- [Mo7O] 24 ] 6- [Mo8O] 26 ] 4- [Mo] 12 O 40 ] 8- or[Mo 36 O 120 ] 8- The cation salt is in the form of Na. + K + NH4 + .

[0008] Furthermore, the particle size of the MoS2 raw material can be in the nanometer, micrometer, or millimeter range.

[0009] Furthermore, the MoS2 dispersion is a molybdenum disulfide dispersion treated with sodium pyrene tetrasulfonate.

[0010] Furthermore, the preparation process of the MoS2 dispersion is as follows: MoS2 is uniformly dispersed in water and homogenized to the nanoscale, and then sodium pyrene tetrasulfonate is added and stirred evenly.

[0011] On the other hand, the present invention provides a molybdenum disulfide-cationic polyelectrolyte-molybdate composite nanomaterial prepared by the above preparation method, which has a nanoscale layered composite structure of alternating assembly of polycations-MoS2-molybdate, and its product form is a sheet structure or a thin film structure.

[0012] In another aspect, the present invention relates to the application of a molybdenum disulfide-cationic polyelectrolyte-molybdate composite nanomaterial prepared by the above preparation method, characterized in that it can be used as a slow-release fertilizer or an antibacterial film.

[0013] The beneficial effects of this invention are: 1. This invention utilizes nano-sized molybdenum disulfide obtained through nanoprocessing. The modification with polycations enhances the dispersibility and stability of the molybdenum disulfide nanosheets in aqueous solution. The addition of sodium pyrenetetroxide allows for π-π interactions with the π electrons on the MoS2 nanosheet surface, strengthening its adsorption. Furthermore, sodium pyrenetetroxide carries multiple sulfonic acid groups, giving it a negative charge, while the cationic polymer carries a positive charge. Therefore, sodium pyrenetetroxide acts as a bridge, attracting polycations to the MoS2 nanosheet surface via electrostatic attraction, thereby increasing the loading of polycations and molybdate. Finally, layer-by-layer technology facilitates the electrostatic adsorption and coordination of polycations and molybdate, constructing a "MoS2-polycation-molybdate" ternary slow-release structure, achieving the slow release of molybdenum and overcoming the technical challenges of poor dispersibility and stability in molybdenum disulfide composites.

[0014] 2. The polycation-MoS2-molybdate alternating assembly of the polycations prepared in this invention forms a nanoscale layered complex. By adjusting the number of centrifugation and adsorption cycles (such as the cyclic treatment in the experiment), the release rate of molybdenum can be precisely controlled. In practical applications, this can reduce the overuse of fertilizers, solving not only the absorption efficiency problem but also the overall stability problem. The slow-release period of molybdenum is extended to 60-90 days (3-5 times that of traditional fertilizers); MoS2 nanosheets improve soil permeability, and polycations enhance soil water retention capacity; the fertilizer has pH self-adaptation (5.0-8.5), making it suitable for various crops.

[0015] 3. The method of the present invention can adjust the number of composite layers and the proportion of components as needed to adapt to different crops and soil conditions.

[0016] 4. The composite material prepared by the method of the present invention can also be applied to antibacterial films, catalysis, energy storage and other fields, and has multifunctionality. Attached Figure Description

[0017] Figure 1 The TG (thermogravimetric analysis) chromatogram of the composite material prepared in Example 1; Figure 2 The image shows a TEM (transmission electron microscope) image of the composite material prepared in Example 1. Figure 3 These are the molybdenum element slow-release curves of the composite materials prepared in each embodiment and comparative example, as well as the blank ammonium molybdate. Detailed Implementation

[0018] The principles and features of the present invention are described below. The embodiments given are only for explaining the present invention and are not intended to limit the scope of the present invention.

[0019] Example 1 The procedure for preparing molybdenum disulfide-cationic polyelectrolyte-molybdate composite nanomaterials in this embodiment is as follows: S1. Prepare a 1% MoS2 solution, stir magnetically for 10 min at room temperature, and then sonicate for 2 h.

[0020] S2. The sonicated MoS2 solution was circulated and homogenized to disperse the MoS2 particles into nanoscale. A sample was taken and the zeta potential was measured. Then, 100 mL of the MoS2 dispersion was taken into a beaker, 0.05 g of sodium pyrene tetrasulfonate was added, stirred evenly, and centrifuged to obtain the solid. S3. Disperse the solid in 100 mL of 0.1% polydiallyldimethylammonium chloride (PDDA) solution, stir well and centrifuge twice.

[0021] S4. The solid was redispersed in 100 ml of 1% H2MoO4 solution, stirred evenly, and centrifuged to obtain the solid.

[0022] Repeat steps S3 and S4 three times, and finally freeze-dry the sample to obtain the "MoS2-PDDA-molybdate" multilayer composite material.

[0023] Example 2 S1. Prepare a 1% MoS2 solution, stir magnetically for 10 min at room temperature, and then sonicate for 2 h.

[0024] S2. The sonicated MoS2 solution was circulated and homogenized to disperse the MoS2 particles into nanoscale. A sample was taken and the zeta potential was measured. Then, 100 mL of the MoS2 dispersion was taken into a beaker, 1 g of sodium pyrene tetrasulfonate was added, stirred evenly, and centrifuged to obtain the solid. S3. Disperse the solid in 100 mL of 1% polyethyleneamine solution, stir well and centrifuge twice.

[0025] S4. The solid was redispersed in 100 ml of 7% K2Mo2O7 solution, stirred evenly, and centrifuged to obtain the solid.

[0026] Finally, the sample was freeze-dried to obtain the "MoS2-polyethyleneamine-molybdate" composite material.

[0027] Example 3 S1. Prepare a 1% MoS2 solution, stir magnetically for 10 min at room temperature, and then sonicate for 2 h.

[0028] S2. The sonicated MoS2 solution was circulated and homogenized to disperse the MoS2 particles into nanoscale. A sample was taken and the zeta potential was measured. Then, 100 mL of the MoS2 dispersion was taken into a beaker, 0.1 g of sodium pyrene tetrasulfonate was added, stirred evenly, and centrifuged to obtain the solid. S3. Disperse the solid in 100 mL of 0.5% polyethyleneimine solution, stir well and centrifuge twice.

[0029] S4 redispersed the solid in 100 ml of 5% (NH4)6Mo7O 24 The solution was stirred until homogeneous and then centrifuged to obtain a solid.

[0030] Finally, the sample was freeze-dried to obtain the "MoS2-polyethyleneimine-molybdate" composite material.

[0031] Example 4 S1. Prepare a 1% MoS2 solution, stir magnetically for 10 min at room temperature, and then sonicate for 2 h.

[0032] S2. The sonicated MoS2 solution was circulated and homogenized to disperse the MoS2 particles into nanoscale. A sample was taken and the zeta potential was measured. Then, 100 mL of the MoS2 dispersion was taken into a beaker, 0.5 g of sodium pyrene tetrasulfonate was added, stirred evenly, and centrifuged to obtain the solid. S3. Disperse the solid in 100 mL of 2% polylysine solution, stir well and centrifuge twice.

[0033] S4 redispersed the solid in 100 ml of 15% (NH4)4Mo8O 26 The solution was stirred until homogeneous and then centrifuged to obtain a solid.

[0034] Finally, the sample was freeze-dried to obtain the "MoS2-polylysine-molybdate" composite material.

[0035] Example 5 S1. Prepare a 1% MoS2 solution, stir magnetically for 10 min at room temperature, and then sonicate for 2 h.

[0036] S2. The sonicated MoS2 solution was circulated and homogenized to disperse the MoS2 particles into nanoscale. A sample was taken and the zeta potential was measured. Then, 100 mL of the MoS2 dispersion was taken into a beaker, 5 g of sodium pyrene tetrasulfonate was added, stirred evenly, and centrifuged to obtain the solid. S3. Disperse the solid in 100 mL of 0.1% poly(dimethylaminoethyl methacrylate) solution, stir well and centrifuge twice.

[0037] S4 redispersed the solid in 100 ml of 1% Na8Mo solution. 12 O 40 The solution was stirred until homogeneous and then centrifuged to obtain a solid.

[0038] Finally, the sample was freeze-dried to obtain the "MoS2-poly(dimethylaminoethyl methacrylate)-molybdate" composite material.

[0039] Example 6 S1. Prepare a 1% MoS2 solution, stir magnetically for 10 min at room temperature, and then sonicate for 2 h.

[0040] S2. The sonicated MoS2 solution was circulated and homogenized to disperse the MoS2 particles into nanoscale. A sample was taken and the zeta potential was measured. Then, 100 mL of the MoS2 dispersion was taken into a beaker, 0.2 g of sodium pyrene tetrasulfonate was added, stirred evenly, and centrifuged to obtain the solid. S3. Disperse the solid in 100 mL of 0.1% polymethacryloyloxyethyltrimethylammonium chloride solution, stir well and centrifuge twice.

[0041] S4 redispersed the solid in 100 ml of 2% (NH4)8Mo solution. 36 O 120 The solution was stirred until homogeneous and then centrifuged to obtain a solid.

[0042] Finally, the sample was freeze-dried to obtain the "MoS2-polymethacryloyloxyethyltrimethylammonium chloride-molybdate" composite material.

[0043] Example 7 S1. Prepare a 1% MoS2 solution, stir magnetically for 10 min at room temperature, and then sonicate for 2 h.

[0044] S2. The sonicated MoS2 solution was circulated and homogenized to disperse the MoS2 particles into nanoscale. A sample was taken and the zeta potential was measured. Then, 100 mL of the MoS2 dispersion was taken into a beaker, 0.1 g of sodium pyrene tetrasulfonate was added, stirred evenly, and centrifuged to obtain the solid. S3. Disperse the solid in 100 mL of 0.5% poly(4-vinylpyridine) quaternary ammonium salt solution, stir well and centrifuge twice.

[0045] S4 redispersed the solid in 100 ml of 5% (NH4)6Mo7O 24 The solution was stirred until homogeneous and then centrifuged to obtain a solid.

[0046] Finally, the sample was freeze-dried to obtain the "MoS2-poly(4-vinylpyridine) quaternary ammonium salt-molybdate" composite material.

[0047] Example 8 S1. Prepare a 1% MoS2 solution, stir magnetically for 10 min at room temperature, and then sonicate for 2 h.

[0048] S2. The sonicated MoS2 solution was circulated and homogenized to disperse the MoS2 particles into nanoscale. A sample was taken and the zeta potential was measured. Then, 100 mL of the MoS2 dispersion was taken into a beaker, 0.1 g of sodium pyrene tetrasulfonate was added, stirred evenly, and centrifuged to obtain the solid. S3. Disperse the solid in 100 mL of 0.5% polyepoxychloropropane-dimethylamine solution, stir well and centrifuge twice.

[0049] S4 redispersed the solid in 100 ml of 5% (NH4)6Mo7O 24 The solution was stirred until homogeneous and then centrifuged to obtain a solid.

[0050] Finally, the sample was freeze-dried to obtain the "MoS2-polyepoxychloropropane-dimethylamine-molybdate" composite material.

[0051] Example 9 S1. Prepare a 1% MoS2 solution, stir magnetically for 10 min at room temperature, and then sonicate for 2 h.

[0052] S2. The sonicated MoS2 solution was circulated and homogenized to disperse the MoS2 particles into nanoscale. A sample was taken and the zeta potential was measured. Then, 100 mL of the MoS2 dispersion was taken into a beaker, 0.1 g of sodium pyrene tetrasulfonate was added, stirred evenly, and centrifuged to obtain the solid. S3. Disperse the solid in 100 mL of 0.5% poly(dimethylaminopropylacrylamide) solution, stir well and centrifuge twice.

[0053] S4 redispersed the solid in 100 ml of 5% (NH4)6Mo7O 24 The solution was stirred until homogeneous and then centrifuged to obtain a solid.

[0054] Finally, the sample was freeze-dried to obtain the "MoS2-poly(dimethylaminopropylacrylamide)-molybdate" composite material.

[0055] The thermogravimetric analysis of the composite material prepared in Example 1 of this invention is shown in the figure. Figure 1 Based on the decomposition temperatures of each substance—PDDA: 280°-300°, ammonium molybdate: 200°-500°, molybdenum disulfide: 1307°-1600°—thermogravimetric analysis (see…) is necessary to determine the optimal temperature range. Figure 1 As shown, it can be verified that the process of the present invention, namely the electrostatic adsorption and coordination of PDDA and ammonium molybdate through Layer-by-Layer technology, successfully constructed the "MoS2-PDDA-ammonium molybdate" ternary sustained-release structure.

[0056] TEM (transmission electron microscopy) image of the composite material prepared in Example 1 of this invention is shown below. Figure 2As can be seen from Figures (c) and (d), the gray amorphous layer encapsulates the edge of MoS2; as can be seen from Figures (a) and (b), there is a contrast between the light and dark areas at the boundary of the encapsulation layer, with Mo (bright) and PDDA (dark); as can be seen from Figure (a), the bonding state of the PDDA-MoS2-ammonium molybdate interface is shown.

[0057] Comparative Example 1 The preparation of the composite material in this comparative example is basically the same as in Example 1, except that sodium pyrene tetrasulfonate was not used in the process.

[0058] Experimental results: The molybdate loading in this comparative product is relatively low.

[0059] The reasons are as follows: Pure MoS2 nanosheets have a layered structure with strong van der Waals forces and hydrophobic interactions between the layers. In aqueous solution, they lack the modification of hydrophilic groups, resulting in weak surface electronegativity and poor hydrophilicity. The layers are prone to attracting each other and stacking together. The surface negative charge density of pure MoS2 nanosheets is extremely low, and the electrostatic adsorption between them and positively charged PDDA is weak, making it impossible to effectively attract PDDA molecules to adsorb on their surface. This leads to a sharp reduction in the positive charge sites on the MoS2 surface, making it unable to effectively adsorb negatively charged molybdate ions. Most of the molybdate ions are lost during centrifugation.

[0060] Comparative Example 2 The preparation of the comparative composite material is basically the same as in Example 1, except that MoS2 is replaced with micron-sized molybdenum powder (without layered structure), while the other reagents and processes are the same.

[0061] Experimental results: Polycations and molybdates could not be effectively loaded; there was no slow-release effect of molybdenum; molybdenum powder had poor solubility in soil and extremely low absorption and utilization rate by plants.

[0062] The reasons are as follows: MoS2 is a two-dimensional layered nanomaterial with an extremely large specific surface area and interlayer voids. Sodium pyrene tetrasulfonate can be anchored on its sheet surface through π-π conjugation, thereby providing high-density electrostatic adsorption sites for PDDA. Molybdate ions are then loaded onto the PDDA-modified layer through electrostatic interaction. The layered structure provides sufficient physical space for multilayer assembly. However, micron-sized molybdenum powder is a blocky particle with a very small specific surface area and no π electron cloud structure on the sheet surface. Sodium pyrene tetrasulfonate cannot achieve effective adsorption through π-π conjugation and can only undergo trace amounts of random physical adhesion. The subsequent electrostatic loading of PDDA and molybdate ions also loses its core anchoring points. Most of the polycations and molybdate ions are lost during the centrifugation process, and effective loading cannot be achieved.

[0063] The above embodiments and comparative examples were subjected to the following tests: 1. Antibacterial performance testing The antibacterial rates of the samples obtained in each embodiment against common plant pathogens (such as Escherichia coli, Staphylococcus aureus, and Ralstonia solanacearum) were tested under near-infrared light irradiation.

[0064] Referring to GB / T 31402-2015 "Test Method for Antibacterial Properties of Plastic Surfaces"; composite nanomaterials were mixed with polylactic acid (PLA) and cast into a film (material addition amount of 5%), cut into 1cm×1cm films, and coated with a bacterial solution. 6 CFU / mL bacterial suspension was added to the surface of the membrane and divided into a near-infrared light irradiation group (808nm, 1W / cm², irradiation for 30min) and a dark group. After incubation at 37℃ for 24h, the bacterial colonies were washed off and counted, and the antibacterial rate was calculated: Antibacterial rate = (number of colonies in the blank group - number of colonies in the test group) / number of colonies in the blank group × 100%.

[0065] The results showed that the composite materials obtained in each embodiment had an antibacterial rate of ≥99% against Escherichia coli, Staphylococcus aureus, and Ralstonia solanacearum under near-infrared light irradiation; while the antibacterial rate of the dark group was ≤10%, confirming that the composite materials prepared by the present invention have significant antibacterial properties under near-infrared light irradiation.

[0066] 2. Molybdenum loading and sustained-release performance testing 1) Molybdenum loading test: Thiocyanate spectrophotometry, reference standard GB / T 14540-2003. The results are shown in Table 1.

[0067] Principle: Mo in MoS2 4 + It does not react with potassium thiocyanate in a weakly acidic, non-oxidizing system, while the Mo in molybdate ions... 6 + Can form orange-red complexes with potassium thiocyanate (KSCN) (e.g., [Mo(SCN)6)). 3 This complex has a characteristic absorption peak at around 460 nm, and its absorbance is proportional to the molybdate concentration, which conforms to the Lambert-Beer law. Molybdate can be quantified using a standard curve.

[0068] Testing steps: Weigh 0.1g of the dried composite sample, add 50mL of 0.5mol / L dilute sulfuric acid (weak acid, non-oxidizing), and ultrasonically extract for 30min (only molybdate is dissolved without destroying the layered structure of MoS2). Centrifuge (8000 r / min, 10 min), collect the supernatant, and bring the volume to 100 mL; Take 5 mL of the dilution solution, add 2 mL of 10% KSCN solution and 1 mL of 5% ascorbic acid solution (for color development), and dilute to 25 mL. Let stand for 15 min. The absorbance was measured at 460 nm using a spectrophotometer. The molar concentration of molybdate in the extract was calculated using a standard curve of molybdate (prepared with the corresponding molybdate such as H2MoO4), and then the mass of molybdate in the sample was calculated.

[0069] Table 1

[0070] 2) Slow-release test: Simulating the release rate and slow-release period of molybdenum in soil leachate. Reference Standard: Referencing NY / T 3039-2016 "Determination of Nutrient Release Rate of Slow-Release Fertilizers," and optimized for agricultural soil characteristics; prepare simulated soil extracts (pH 5.0-8.5, simulating different soil pH levels). Place 0.5g of the composite nanomaterial in 500mL of the extract and conduct extraction experiments at 25℃ and 150r / min in a shaker. Samples were taken at 1, 3, 7, 15, 30, 60, 75, and 90 days. After filtration through a 0.22μm filter membrane, the molybdenum concentration was determined using ICP-OES. The cumulative release rate was calculated, and a slow-release curve was plotted. (See figure). Figure 3 As shown in the figure. Ammonium molybdate was used as a blank control.

[0071] Depend on Figure 3 The results show that the molybdenum sample prepared by the technology of this invention has a good sustained-release effect and can be continuously released within 90 days, with a cumulative release rate of ≤95% over 90 days; the traditional molybdenum fertilizer (ammonium molybdate) has a cumulative release rate of over 98% in 3-5 days and no sustained-release effect; the comparative example 2 (micron-sized molybdenum powder) has a cumulative release rate of ≤10% over 90 days and no sustained-release effect.

Claims

1. A method for preparing molybdenum disulfide-cationic polyelectrolyte-molybdate composite nanomaterials, characterized in that, Includes the following steps: S1. Add cationic polyelectrolyte to the MoS2 dispersion and disperse evenly to obtain the dispersion; S2. Separate the dispersion into solid and liquid phases, and collect the solid. S3. Redisperse the solid in a cationic polyelectrolyte solution, centrifuge, and collect the solid. S4. Redissolve the solid in a solution containing molybdate, centrifuge, and obtain the solid. Steps S3 and S4 are performed at least once to obtain composite nanomaterials.

2. The preparation method according to claim 1, characterized in that, The cationic polyelectrolyte is polyethyleneamine, polyethyleneimine, polydiallyldimethylammonium chloride, polylysine, polydimethylaminoethyl methacrylate, polymethacryloyloxyethyltrimethylammonium chloride, poly(4-vinylpyridine) quaternary ammonium salt, polyepoxychloropropane-dimethylamine, or poly(dimethylaminopropylacrylamide).

3. The preparation method according to claim 1, characterized in that, The molybdate ion is derived from molybdic acid or its cation salt, and the molybdic acid is derived from H₂MoO₄ or Mo₂O₇. 2- [Mo7O] 24 ] 6- [Mo8O] 26 ] 4- [Mo] 12 O 40 ] 8- or[Mo 36 O 120 ] 8- The cation salt is in the form of Na. + K + NH4 + .

4. The preparation method according to claim 1, characterized in that, The particle size of the MoS2 is in the nanometer, micrometer, or millimeter range.

5. The preparation method according to claim 1, characterized in that, The MoS2 dispersion is a molybdenum disulfide dispersion treated with pyrene tetrasulfonic acid.

6. The preparation method according to claim 5, characterized in that, The preparation process of the MoS2 dispersion is as follows: MoS2 is uniformly dispersed in water and homogenized to the nanoscale, and then sodium pyrene tetrasulfonate is added and stirred evenly.

7. A molybdenum disulfide-cationic polyelectrolyte-molybdate composite nanomaterial, characterized in that, It is prepared by the preparation method according to any one of claims 1-6.

8. The molybdenum disulfide-cationic polyelectrolyte-molybdate composite nanomaterial according to claim 7, characterized in that, It has a nanoscale layered composite structure with alternating PDDA-MoS2-ammonium molybdate.

9. The molybdenum disulfide-cationic polyelectrolyte-molybdate composite nanomaterial according to claim 8, characterized in that, Its product form is a sheet structure or a thin film structure.

10. An application of the molybdenum disulfide-cationic polyelectrolyte-molybdate composite nanomaterial as described in any one of claims 7-9, characterized in that, Used as a slow-release fertilizer in agriculture or as an antibacterial film.

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