Rare earth doped hydrotalcite supported nano-pesticide, preparation method and application thereof

Abstract

The application belongs to the technical field of pesticides and fertilizers, and particularly relates to a rare earth doped hydrotalcite supported nano pesticide, a preparation method and application thereof. The rare earth doped hydrotalcite supported nano pesticide has good optical properties, can trace the migration path and enrichment law of the pesticide, enhances the systemicity of the pesticide, and improves the utilization rate of the pesticide. The rare earth doped hydrotalcite supported nano pesticide can realize the uniform distribution and accumulation of the effective component of the pesticide in the plant, significantly improve the efficacy of the pesticide, enhance the systemicity of the pesticide, solve the problems of easy decomposition of the pesticide and the need for multiple and large amount of application, achieve the purpose of reducing the application amount and increasing the efficacy, and can also utilize the optical properties of the rare earth doped hydrotalcite to trace the migration path and enrichment law of the pesticide, and improve the utilization rate of the pesticide.

Description

Technical Field

[0001] This invention belongs to the field of pesticide and fertilizer technology, specifically relating to a rare earth-doped hydrotalcite-supported nanopesticide, its preparation method, and its application. Background Technology

[0002] Pesticides are an essential agricultural input for controlling pests and diseases and ensuring food security. Existing pesticide products are mainly in traditional formulations such as emulsifiable concentrates, powders, and suspensions. Based on their systemic and translocation behavior within plants, pesticides are divided into two main categories: systemic and non-systemic. Non-systemic pesticides, because they cannot be transported to all parts of the plant, require multiple applications in large quantities, which not only easily leads to pesticide residues but also facilitates leaching into the soil and groundwater, posing significant environmental risks.

[0003] Systemic pesticides have effectively solved the problems associated with non-systemic pesticides because they can enter the target crop through the roots and leaves, and are transported to all parts of the plant through absorption and translocation, achieving effective control of pests and diseases. However, existing systemic pesticides lack sufficient systemic properties and cannot fully exert their efficacy. Summary of the Invention

[0004] The purpose of this invention is to provide a rare earth-doped hydrotalcite-supported nanopesticide, its preparation method and application. The rare earth-doped hydrotalcite-supported nanopesticide provided by this invention can enhance the systemic properties of pesticides and trace the systemic conduction pathway and enrichment pattern of pesticides.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] This invention provides a rare-earth-doped hydrotalcite-supported nanopesticide, comprising rare-earth-doped hydrotalcite and pesticide active ingredients supported on the rare-earth-doped hydrotalcite; the structural formula of the rare-earth-doped hydrotalcite is (M1). x (M2M3) y (OH)2(A) y ·zH2O, where M1 is Mg 2+ Ca 2+ and Zn 2+ One or more of them, M2 is Fe 3+ Cr 3+ And Al 3+ One or more of the following, M3 is a rare earth metal ion with optical properties, A is a negatively charged intercalation molecule, x is 0.2 to 0.5, y = 1-x, and z is 4 to 10.

[0007] Preferably, the active ingredient of the pesticide includes one or more of chemically synthesized pesticides and bio-fermented pesticides.

[0008] Preferably, the content of the pesticide active ingredient in the rare earth-doped hydrotalcite-supported nanopesticide is 20-60 wt%.

[0009] Preferably, the particle size of the rare earth-doped hydrotalcite is 10–300 nm.

[0010] Preferably, the rare earth metal ions with optical properties include Eu. 3+ and Tb 3+ One or more of them.

[0011] Preferably, the negatively charged intercalation molecules include one or more of inorganic anions and organic molecules.

[0012] This invention also provides a method for preparing the rare earth-doped hydrotalcite-supported nanopesticide described above, comprising the following steps:

[0013] Rare earth-doped hydrotalcite, pesticide active ingredients, and a good solvent are mixed, self-assembled and loaded, and then sheared and emulsified to obtain the rare earth-doped hydrotalcite-loaded nano-pesticide.

[0014] Preferably, the rotation speed of the shear emulsification is 3000-10000 rpm, and the shear emulsification time is 1-10 min.

[0015] Preferably, the temperature of the self-assembled load is 10–30°C.

[0016] The present invention also provides the application of the rare earth-doped hydrotalcite-supported nanopesticides described in the above-described scheme or the rare earth-doped hydrotalcite-supported nanopesticides prepared by the above-described scheme in the prevention and control of crop diseases and pests.

[0017] This invention provides a rare-earth-doped hydrotalcite-supported nanopesticide, comprising rare-earth-doped hydrotalcite and pesticide active ingredients loaded on the rare-earth-doped hydrotalcite. Through the transport mediated by rare-earth-doped hydrotalcite, this invention not only achieves uniform distribution and accumulation of pesticide active ingredients within the plant, significantly enhancing its efficacy and systemic absorption, but also overcomes the drawbacks of pesticide decomposition and the need for multiple large applications, thus achieving the goal of reduced application and increased efficiency. Furthermore, the optical properties of rare-earth-doped hydrotalcite can be used to trace the migration path and accumulation patterns of pesticides, thereby improving pesticide utilization.

[0018] This invention also provides a method for preparing the rare-earth-doped hydrotalcite-supported nanopesticide described above. The preparation method provided by this invention exhibits good stability, consistent product quality, and low cost, making it suitable for industrial applications.

[0019] This invention also provides the application of the rare earth-doped hydrotalcite-supported nanopesticides described in the above-described schemes, or the rare earth-doped hydrotalcite-supported nanopesticides prepared by the above-described methods, in the control of crop diseases and pests. The rare earth-doped hydrotalcite-supported nanopesticides provided by this invention have high utilization rates and allow the active ingredients to exert their effects more effectively, playing a vital role in crop growth and soil protection. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the migration tracing of the rare earth-doped hydrotalcite-supported nanopesticide prepared in Example 1.

[0022] Figure 2 Scanning electron microscope images and elemental composition diagrams of rare earth-doped hydrotalcite prepared in Examples 1 and 2;

[0023] Figure 3 The XRD pattern of the rare earth-doped hydrotalcite-supported nanopesticide prepared in Example 1;

[0024] Figure 4 Scanning electron microscope image of the rare earth-doped hydrotalcite-supported nanopesticide prepared in Example 2;

[0025] Figure 5 Intraplant transduction tracer diagram of the rare earth-doped hydrotalcite-supported nanopesticide prepared in Example 1;

[0026] Figure 6 The image shows the intraplant transduction tracer of the rare earth-doped hydrotalcite-supported nanopesticide prepared in Example 2. Detailed Implementation

[0027] This invention provides a rare earth-doped hydrotalcite-supported nanopesticide, comprising rare earth-doped hydrotalcite and pesticide active ingredients supported on the rare earth-doped hydrotalcite.

[0028] In this invention, the structural formula of the rare earth-doped hydrotalcite is (M1). x (M2M3) y (OH)2(A) y ·zH2O, where M1 is Mg 2+ Ca 2+ and Zn 2+ One or more of them, M2 is Fe 3+ Cr3+ And Al 3+ One or more of the following, M3 is a rare earth metal ion with optical properties, A is a negatively charged intercalation molecule, x is 0.2 to 0.5, y = 1-x, and z is 4 to 10.

[0029] In this invention, the rare earth metal ions with optical properties preferably include Eu. 3+ and Tb 3+ One or more of these. This invention uses rare earth metal ions to provide fluorescence signals to trace the absorption and transport behavior of rare earth-doped hydrotalcite-supported nanopesticides within plants.

[0030] In this invention, the negatively charged intercalation molecules preferably include one or more of inorganic anions and organic molecules; the inorganic anions preferably include one or more of carbonate, nitrate and sulfate; and the organic molecules preferably include one or more of salicylic acid, succinic acid, adipic acid, p-hydroxybenzoic acid and triethanolamine.

[0031] In this invention, zH2O is the water of crystallization adsorbed by rare earth-doped hydrotalcite.

[0032] In this invention, the particle size of the rare-earth-doped layered double hydroxide (TLH) is preferably 10–300 nm, specifically 100 nm or 200 nm. This invention optimizes the electron density and band structure through rare-earth doping, resulting in the rare-earth-doped TDH exhibiting ultraviolet light response characteristics.

[0033] In this invention, the method for preparing the rare earth-doped hydrotalcite includes the following steps: mixing M1 metal salt, M2 metal salt, M3 metal salt, surfactant, alkali and water (referred to as the first mixture, to obtain the first mixed liquid) and then shearing emulsifying (referred to as the first shearing emulsification) to obtain the rare earth-doped hydrotalcite.

[0034] In this invention, the M1 metal salt is preferably a divalent soluble metal salt; the divalent soluble metal salt preferably includes one or more of magnesium salt, calcium salt and zinc salt; the magnesium salt preferably includes one or more of inorganic magnesium salt and organic magnesium salt; the inorganic magnesium salt preferably includes one or more of magnesium nitrate, magnesium chloride and magnesium sulfate; the organic magnesium salt is preferably magnesium acetate.

[0035] In this invention, the calcium salt preferably includes one or more of inorganic calcium salts and organic calcium salts; the inorganic calcium salt preferably includes one or more of calcium nitrate, calcium chloride and calcium sulfate; and the organic calcium salt is preferably calcium acetate.

[0036] In this invention, the zinc salt preferably includes one or more of inorganic zinc salts and organic zinc salts; the inorganic zinc salt preferably includes one or more of zinc nitrate, zinc chloride, and zinc sulfate; and the organic zinc salt is preferably zinc acetate.

[0037] In this invention, the M2 metal salt is preferably a trivalent soluble metal salt; the trivalent soluble metal salt preferably includes one or more of iron salts, chromium salts, and aluminum salts; the iron salt preferably includes one or more of inorganic iron salts, organic acid iron salts, and metal alkoxide iron salts; the inorganic iron salt preferably includes one or more of ferric nitrate, ferric chloride, and ferric sulfate; the organic acid iron salt preferably includes one or two of ferric citrate and ferric acetate; and the metal alkoxide iron salt is preferably ferric ethoxide.

[0038] In this invention, the chromium salt preferably includes one or more of inorganic chromium salts, organic acid chromium salts, and metal alkoxide chromium salts; the inorganic chromium salt preferably includes one or more of chromium nitrate, chromium chloride, and chromium sulfate; the organic acid chromium salt preferably includes chromium acetate; and the metal alkoxide chromium salt is preferably chromium isopropoxide.

[0039] In this invention, the aluminum salt preferably includes one or more of inorganic aluminum salts, organic acid aluminum salts, and metal alkoxide aluminum salts; the inorganic aluminum salt preferably includes one or more of aluminum nitrate, aluminum chloride, and aluminum sulfate; the organic acid aluminum salt preferably includes aluminum acetate; and the metal alkoxide aluminum salt is preferably aluminum isopropoxide.

[0040] In this invention, the molar ratio of the M1 metal salt to the M2 metal salt is preferably 2 to 4:1, specifically 2:1, 2.5:1, 3:1, 3.5:1 or 4:1.

[0041] In this invention, the M3 metal salt preferably includes one or more of europium salt and terbium salt; the europium salt is preferably europium nitrate; and the terbium salt is preferably terbium nitrate.

[0042] In this invention, the molar ratio of the M2 metal salt to the M3 metal salt is preferably 99-90:1-10, specifically 99:1, 95:5 or 90:10.

[0043] In this invention, the total concentration of metal salts M1, M2 and M3 in the first mixture is preferably 2.5 to 250 mmol / L, specifically 2.5 mmol / L, 5 mmol / L, 10 mmol / L, 20 mmol / L, 50 mmol / L, 100 mmol / L, 150 mmol / L, 200 mmol / L or 250 mmol / L.

[0044] In this invention, the surfactant preferably includes one or more of sodium dodecyl sulfate, sodium lauryl sulfate, hexadecyltrimethylammonium bromide, Tween and Span, and more preferably sodium dodecyl sulfate.

[0045] In this invention, the alkali preferably includes one or more of urea, ammonia, sodium hydroxide and potassium hydroxide, and more preferably sodium hydroxide.

[0046] In this invention, the molar ratio of the surfactant to the alkali is preferably 1-10:100-10000, specifically 1:100, 1:200, 1:300, 1:500, 1:700, 1:1000, 1:2000, 1:3000, 1:5000, 1:7000, 1:9000, or 1:10000.

[0047] In this invention, the concentration of alkali in the first mixture is preferably 5 to 500 mmol / L, specifically 5 mmol / L, 10 mmol / L, 50 mmol / L, 100 mmol / L, 200 mmol / L, 300 mmol / L, 400 mmol / L or 500 mmol / L.

[0048] In this invention, the first mixing is preferably: mixing metal salts M1, M2 and M3 with a portion of water to obtain a metal salt solution, mixing alkali and surfactant with the remaining portion of water to obtain a surfactant alkali solution, and then mixing the metal salt solution and the surfactant alkali solution.

[0049] In this invention, the volume ratio of the metal salt solution to the surfactant alkaline solution is preferably 1:1.

[0050] In this invention, the first mixing device is preferably a colloid mill.

[0051] In this invention, the equipment for the first shear emulsification is preferably a colloid mill; the rotation speed of the first shear emulsification is preferably 3000-8000 rpm, specifically 3000 rpm, 5000 rpm, 6000 rpm, or 8000 rpm; the time of the first shear emulsification is preferably 1-4 min, specifically 2 min or 3 min. During the shearing process, the metal salt and alkali in the two solutions undergo a co-precipitation reaction. The growth process is controlled by shearing, and the surface reacts fully with the surfactant to control its size and achieve the purpose of surface hydrophobic modification.

[0052] In this invention, the first shear emulsification preferably further includes centrifuging and washing the resulting product; when M1, M2, and M3 metal salts are all inorganic salts, the washing reagent is water; the water is preferably deionized water; the washing standard is preferably a pH value of 7.0±0.5 for the supernatant; when M1, M2, and M3 metal salts are not all inorganic salts, the washing is preferably performed alternately with water washing and alcohol washing; the alcohol used for alcohol washing is preferably ethanol; the water used for water washing is preferably deionized water; the washing standard is preferably a pH value of 7.0±0.5 for the supernatant.

[0053] In this invention, the active ingredient of the pesticide preferably includes one or more of chemically synthesized pesticides and bio-fermented pesticides; the chemically synthesized pesticide preferably includes one or more of chlorantraniliprole and pyrethroid pesticides; the pyrethroid pesticide preferably includes one or more of lambda-cyhalothrin, deltamethrin, deltamethrin, and cyhalothrin; and the bio-fermented pesticide is preferably abamectin.

[0054] In this invention, the content of pesticide active ingredient in the rare earth-doped hydrotalcite-supported nano-pesticide is preferably 20-60 wt%, specifically 20 wt%, 30 wt%, 40 wt%, 45 wt%, 50 wt%, 55 wt%, or 60 wt%.

[0055] This invention also provides a method for preparing the rare earth-doped hydrotalcite-supported nanopesticide described above, comprising the following steps:

[0056] Rare earth-doped hydrotalcite, pesticide active ingredients, and a good solvent are mixed (referred to as the second mixture), and then self-assembled and loaded, followed by shear emulsification (referred to as the second shear emulsification) to obtain the rare earth-doped hydrotalcite-supported nano-pesticide.

[0057] In this invention, the good solvent preferably includes one or more of ketones, haloalkanes, alcohols and amide solvents, more preferably amide solvents; the ketone is preferably acetone; the haloalkanes are preferably dichloromethane; the alcohols are preferably methanol; and the amide solvent is preferably dimethylformamide (DMF).

[0058] In this invention, the preferred mass ratio of rare earth-doped hydrotalcite to a good solvent is 1.0 g / L to 100.0 g / L, specifically 2.0 g / L or 50.0 g / L. This invention determines the amount of rare earth-doped hydrotalcite and the effective pesticide component based on the loading ratio of the rare earth-doped hydrotalcite-supported nanopesticide.

[0059] In this invention, the second mixing is preferably performed by: mixing rare earth-doped hydrotalcite with a portion of a good solvent to obtain a rare earth-doped hydrotalcite solution, mixing the pesticide active ingredient with the remaining portion of the good solvent to obtain a pesticide active ingredient solution, and then mixing the rare earth-doped hydrotalcite solution and the pesticide active ingredient solution. This invention, through the second mixing, ensures that the raw materials are thoroughly stirred until uniformly dispersed.

[0060] In this invention, the temperature of the self-assembled load is preferably 10 to 30°C, specifically 20°C or 25°C.

[0061] In this invention, the rotation speed of the second shear emulsification is preferably 3000-10000 rpm, specifically 6000 rpm or 8000 rpm; the time of the first shear emulsification is preferably 1-10 min, specifically 3 min or 7 min; and the temperature of the second shear emulsification is preferably 10-30℃, specifically 20℃ or 25℃.

[0062] In this invention, the second shear emulsification preferably further includes removing the solvent from the resulting emulsion system; the solvent removal is preferably rotary evaporation; the rotary evaporation temperature is preferably 50-100°C, specifically 80°C; the rotary evaporation time is preferably 0.5-6 hours, specifically 2 hours.

[0063] The present invention also provides the application of the rare earth-doped hydrotalcite-supported nanopesticides described in the above-described scheme or the rare earth-doped hydrotalcite-supported nanopesticides prepared by the above-described scheme in the prevention and control of crop diseases and pests.

[0064] The rare earth-doped hydrotalcite-supported nano-pesticide provided by this invention is suitable for the prevention and control of crop diseases and pests, especially for crops such as cucumbers, cabbages and strawberries.

[0065] In this invention, the application preferably includes the following steps: applying rare earth-doped hydrotalcite-supported nano-pesticide after dilution.

[0066] In this invention, the dilution is used to obtain a diluent, and the concentration of the diluent is preferably 0.02 to 0.2 g / L, specifically 0.02 g / L, 0.05 g / L, 0.08 g / L, 0.1 g / L, 0.15 g / L or 0.2 g / L.

[0067] In this invention, the application preferably includes spraying, soil application and root irrigation, or trunk injection; the number of applications is preferably 2 to 5 times, specifically 3 times; when the application is spraying or soil application and root irrigation, the application amount of the rare earth-doped hydrotalcite-supported nano-pesticide is preferably 1 to 2 g of active ingredient per acre.

[0068] To further illustrate the present invention, the following detailed description of the invention's solutions, in conjunction with the accompanying drawings and embodiments, is provided, but should not be construed as limiting the scope of protection of the present invention.

[0069] Example 1

[0070] (1) Weigh 25.6g magnesium nitrate, 16.875g aluminum nitrate and 2.23g europium nitrate (molar ratio Mg:Al:Eu=2:0.9:0.5) and dissolve them in 500mL of deionized water to prepare metal salt solutions with concentrations of 0.2mol / L, 0.09mol / L and 0.01mol / L, respectively;

[0071] (2) Weigh 12g of sodium hydroxide and 0.144g of SDS and dissolve them in 500mL of deionized water to prepare surfactant alkaline solutions with concentrations of 0.6mol / L and 0.001mol / L; there is no requirement for the order of preparation of the metal salt solution and the surfactant alkaline solution;

[0072] (3) The metal salt solution and the surfactant alkaline solution were rapidly mixed in a colloid mill and the reaction was carried out at a speed of 5000 rpm for 2 min to obtain europium-doped hydrotalcite solution.

[0073] (4) The prepared europium-doped hydrotalcite solution was centrifuged at 6000 rpm for 10 min. The supernatant was removed, and 10 g of europium-doped hydrotalcite was added to 200 mL of water for redispersibility. If necessary, ultrasonication was used to obtain a uniform and stable nano-dispersion system.

[0074] (5) After completely dissolving 3g of chlorantraniliprole technical (95% content) in DMF, a clear solution is obtained. The clear solution is mixed with the nano-dispersion system prepared in step (4) and shear emulsification is continued. The reaction is carried out at a speed of 3000rpm for 3min. The obtained solution is then rotary evaporated at 80℃ for 2h to remove DMF, and rare earth doped hydrotalcite supported nano-pesticide is obtained. The volume is adjusted to 500mL, and the effective dose concentration is 5.7g / L.

[0075] Example 2

[0076] (1) Weigh 14.16g of calcium nitrate, 6.75g of aluminum nitrate and 0.91g of terbium nitrate and dissolve them in 200mL of deionized water to prepare metal salt solutions with concentrations of 0.3mol / L and 0.1mol / L, respectively;

[0077] (2) Weigh 6.4g of sodium hydroxide and 0.03g of SDS and dissolve them in 200mL of deionized water to prepare surfactant alkaline solutions with concentrations of 0.8mol / L and 0.0005mol / L; there is no requirement for the order of preparation of the metal salt solution and the surfactant alkaline solution;

[0078] (3) The metal salt solution and the surfactant alkaline solution were rapidly mixed in a colloid mill and kept at a speed of 6000 rpm for 3 min to co-precipitate and obtain a hydrotalcite solution.

[0079] (4) Centrifuge the prepared hydrotalcite solution at 8000 rpm for 10 min. Remove the supernatant, add water to redisperse, and continue centrifuging until the supernatant is neutral.

[0080] (5) Centrifuge the prepared hydrotalcite solution at 6000 rpm for 10 min. Remove the supernatant, take 5 g of hydrotalcite carrier and add it to 100 mL of water to redisperse. If necessary, use ultrasound to assist in obtaining a uniform and stable nano-dispersion system.

[0081] (6) After completely dissolving 10g of abamectin technical (95% content) in acetone, a clear solution is obtained. The clear solution is mixed with the nano-dispersion system prepared in step (4) and shear emulsification is continued. The rotation speed is maintained at 3000rpm for 2min. The obtained solution is rotary evaporated at 80℃ for 2h to remove acetone, and rare earth doped hydrotalcite supported nano-pesticide is obtained. The volume is adjusted to 500mL, and the effective dose concentration is 19.0g / L.

[0082] Test Example 1

[0083] The morphology of the rare earth-doped hydrotalcites prepared in Examples 1 and 2 was characterized, and the results are as follows: Figure 2 As stated. Figure 2 It can be seen that rare earth elements are evenly distributed in the structure of hydrotalcite.

[0084] Test Example 2

[0085] The rare earth-doped hydrotalcite-supported nanopesticide prepared in Example 1 was subjected to XRD pattern analysis, and the results are as follows: Figure 3 As shown; the rare earth-doped hydrotalcite-supported nanopesticide prepared in Example 2 was tested by scanning electron microscopy, and the results are as follows. Figure 4 As shown. According to Figure 3 and Figure 4 It can be seen that in rare earth-doped hydrotalcite-supported nanopesticides, the assembled hydrotalcite-based chlorantraniliprole and abamectin have a sheet-like structure with a size of about 100 nm.

[0086] Test Example 3

[0087] The rare-earth-doped hydrotalcite-supported nanopesticide prepared in Example 1 was traced within plants. Images were taken of the fluorescently labeled nanopesticide entering the plant through the roots, and its migration tracing was as follows: Figure 1 As shown, the test results are as follows: Figure 5 As shown. According to Figure 5It can be seen that after spraying, the effective concentration of chlorantraniliprole in the plant reached 18.72 ppm. The systemic migration characteristics of rare earth-doped hydrotalcite-supported nanopesticides mediated by hydrotalcite carriers were traced by using a laser confocal microscope with europium red excitation light as a signal.

[0088] The rare earth-doped hydrotalcite-supported nanopesticide prepared in Example 2 was subjected to in-plant tracing. Images were taken of the fluorescently labeled nanopesticide entering the plant through the root system. The test results are as follows: Figure 6 As shown. According to Figure 6 It can be seen that abamectin-supported nanopesticides can be absorbed into plants through the root system, reaching an effective concentration of 73.46 ppm within the plant. Furthermore, the systemic migration characteristics of the nanopesticide structure mediated by the hydrotalcite carrier were traced by ultraviolet light excitation using the yellow-green excitation light of terbium as a signal.

[0089] Test Example 4

[0090] Using strawberries and cabbages as experimental crops, the efficacy of rare-earth-doped hydrotalcite-supported nanopesticides prepared in Examples 1 and 2 was evaluated. The evaluation method was as follows: The rare-earth-doped hydrotalcite-supported nanopesticide prepared in Example 1 was diluted 500 times and applied as a root drench on strawberry seedlings on the 15th day of growth, once daily for three applications. The aphid control effect was analyzed, with a commercially available pesticide used as a control group. The results are shown in Table 1. The rare-earth-doped hydrotalcite-supported nanopesticide prepared in Example 2 was diluted 500 times and applied as a single-leaf spray on cabbage seedlings on the 15th day of growth, once daily for three applications. Untreated leaves were harvested and fed to diamondback moths, with a commercially available pesticide used as a control group. The insecticidal effect was analyzed, and the results are shown in Table 2.

[0091] Table 1. Efficacy of rare earth-doped hydrotalcite-supported nanopesticides against strawberry aphids in Example 1

[0092] 1 day / % 3 days / % 7 days / % 14 days / % control group 47.29±12.84 51.17±7.68 56.55±11.21 62.65±8.42 Nanopesticides 70.82±9.13 79.13±2.87 86.34±7.45 91.57±1.72

[0093] Table 2. Efficacy of rare earth-doped hydrotalcite-supported nanopesticides against diamondback moth in Example 2.

[0094] 1 day / % 3 days / % 7 days / % 14 days / % control group 45.46±18.92 51.68±0.38 62.75±5.33 69.27±9.81 Nanopesticides 67.64±21.59 82.49±4.73 86.92±10.44 92.48±2.05

[0095] As shown in Tables 1 and 2, the rare earth-doped hydrotalcite-supported nanopesticides chlorantraniliprole and abamectin exhibit a significant advantage in efficacy compared to traditional formulations approximately 3 days after application. This demonstrates that, mediated by the rare earth-doped hydrotalcite carrier, the active ingredients of pesticides can migrate and translocate within the plant, achieving highly efficient control of pests and diseases.

[0096] As can be seen from the above embodiments, the rare earth-doped hydrotalcite-supported nanopesticides provided by the present invention have good optical properties, can trace the migration path and enrichment pattern of pesticides, enhance the systemic properties of pesticides, and improve the utilization rate of pesticides.

[0097] Although the above embodiments have provided a detailed description of the present invention, they are only some embodiments of the present invention, and not all embodiments. Other embodiments can be obtained based on these embodiments without creative effort, and these embodiments all fall within the protection scope of the present invention.

Claims

1. A rare earth-doped hydrotalcite-supported nanopesticide, characterized in that, It includes rare earth-doped hydrotalcite and pesticide active ingredients loaded on the rare earth-doped hydrotalcite; the structural formula of the rare earth-doped hydrotalcite is (M1). x (M2M3) y (OH)2(A) y ∙zH2O, where M1 is Mg 2+ Ca 2+ and Zn 2+ One or more of them, M2 is Fe 3+ Cr 3+ And Al 3+ One or more of the following, M3 is a rare earth metal ion with optical properties, A is one or more of carbonate, nitrate and sulfate, x is 0.2~0.5, y=1-x, z is 4~10; The active ingredient of the pesticide includes one or more of chlorantraniliprole and abamectin technical; The content of the active pesticide ingredient in the rare earth-doped hydrotalcite-supported nanopesticide is 20-60 wt%. The rare earth metal ions with optical properties include Eu. 3+ and Tb 3+ One or more of them.

2. The rare earth-doped hydrotalcite-supported nanopesticide according to claim 1, characterized in that, The rare earth-doped hydrotalcite has a particle size of 10~300 nm.

3. The preparation method of the rare earth-doped hydrotalcite-supported nanopesticide according to claim 1 or 2, characterized in that, Includes the following steps: Rare earth-doped hydrotalcite, pesticide active ingredients, and a good solvent are mixed, self-assembled and loaded, and then sheared and emulsified to obtain the rare earth-doped hydrotalcite-supported nanopesticide; the good solvent includes one or more of ketones, halogenated hydrocarbons, alcohols, and amide solvents.

4. The preparation method according to claim 3, characterized in that, The shear emulsification rotation speed is 3000~10000 rpm, and the shear emulsification time is 1~10 min.

5. The preparation method according to claim 3, characterized in that, The temperature of the self-assembled load is 10~30 ℃.

6. The application of the rare earth-doped hydrotalcite-supported nanopesticide according to claim 1 or 2 or the rare earth-doped hydrotalcite-supported nanopesticide obtained by the preparation method according to any one of claims 3 to 5 in the prevention and control of crop diseases and pests.

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