Rare earth doped hydrotalcite supported nano pesticide as well as preparation method and application thereof

Abstract

The invention belongs to the technical field of pesticides and chemical fertilizers, and particularly relates to a rare earth doped hydrotalcite supported nano pesticide as well as a preparation method and application thereof. The rare earth doped hydrotalcite supported nano-pesticide provided by the invention has good optical characteristics, can trace the migration path and the enrichment rule of the pesticide, enhances the systemic property of the pesticide, and improves the utilization rate of the pesticide. According to the rare earth doped hydrotalcite loaded nano pesticide provided by the invention, through the mediated transportation of the rare earth doped hydrotalcite, the uniform distribution and accumulation of effective components of the pesticide in plants are realized, the pesticide effect is remarkably improved, the systemic property of the pesticide is enhanced, and the defects that the pesticide is easy to decompose and needs to be applied in a large amount for multiple times are overcome; and the optical characteristics of the rare earth doped hydrotalcite can be utilized to trace the migration path and the enrichment rule of the pesticide, so that the utilization rate of the pesticide is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of pesticides and fertilizers, and in particular relates to a rare earth-doped hydrotalcite-loaded nanopesticide and a preparation method and application thereof. Background Art

[0002] Pesticides are one of the important agricultural inputs that are essential for preventing and controlling pests and diseases and ensuring food security. Existing pesticide products are mainly traditional dosage forms such as emulsions, powders and suspensions. Pesticides are divided into two categories, systemic and non-systemic, based on whether they can be absorbed and conducted in the plant body. For non-systemic pesticides, because they cannot be transported to various parts of the plant, they need to be applied multiple times and in large quantities, which not only easily causes pesticide residues, but also easily leaches into the soil and groundwater environment, causing major environmental risks.

[0003] Systemic pesticides solve the problem of non-systemic pesticides because they can enter the target crop through the roots and leaves, and are transported to various parts of the plant through absorption and conduction, achieving the goal of effectively preventing and controlling pests and diseases. However, the existing systemic pesticides are not systemic enough and cannot fully exert their efficacy. Summary of the invention

[0004] The purpose of the present invention is to provide a rare earth doped hydrotalcite-loaded nanopesticide and its preparation method and application. The rare earth doped hydrotalcite-loaded nanopesticide provided by the present invention can enhance the systemicity of the pesticide and trace the systemic conduction path and enrichment law of the pesticide.

[0005] In order to achieve the above object, the present invention provides the following technical solutions:

[0006] The present invention provides a rare earth doped hydrotalcite supported nano pesticide, comprising rare earth doped hydrotalcite and a pesticide active ingredient supported on the rare earth doped hydrotalcite; the rare earth doped hydrotalcite has a structural formula of (M 1 ) x (M 2 M 3 ) y (OH) 2 (A) y ·zH 2 O, where M 1 Mg 2+ , Ca 2+ and Zn 2+ One or more of M 2 Fe 3+ Cr 3+ and Al 3+ One or more of M 3It is a rare earth metal ion with optical properties, A is an interlayer intercalation molecule with negative charge, x is 0.2-0.5, y=1-x, and z is 4-10.

[0007] Preferably, the active ingredients of the pesticide include one or more of chemically synthesized pesticides and biologically 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 to 300 nm.

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

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

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

[0013] The rare earth doped hydrotalcite, the pesticide active ingredient and the good solvent are mixed for self-assembly loading and then shear emulsification 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 time of the shear emulsification is 1-10 min.

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

[0016] The present invention also provides the use of the rare earth doped hydrotalcite-loaded nanopesticide described in the above scheme or the rare earth doped hydrotalcite-loaded nanopesticide obtained by the preparation method described in the above scheme in the prevention and control of crop diseases and insect pests.

[0017] The present invention provides a rare earth doped hydrotalcite supported nano pesticide, comprising rare earth doped hydrotalcite and a pesticide active ingredient supported on the rare earth doped hydrotalcite. The present invention not only realizes the uniform distribution and accumulation of the pesticide active ingredient in the plant through the mediated transport of the rare earth doped hydrotalcite, significantly improves its efficacy, enhances the systemicity of the pesticide, solves the shortcomings of the pesticide being easy to decompose and requiring multiple large-scale applications, and achieves the purpose of reducing application and increasing efficiency, but also can use 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.

[0018] The present invention also provides a method for preparing the rare earth-doped hydrotalcite-loaded nanopesticide described in the above scheme. The preparation method provided by the present invention has good stability, stable product quality, low cost, and is suitable for industrial application.

[0019] The present invention also provides the use of the rare earth doped hydrotalcite-loaded nanopesticide described in the above scheme or the rare earth doped hydrotalcite-loaded nanopesticide obtained by the preparation method described in the above scheme in the prevention and control of crop diseases and insect pests. The rare earth doped hydrotalcite-loaded nanopesticide provided by the present invention has a high utilization rate, and the effective ingredients play a better role, which plays an important role in the growth of crops and soil protection. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[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 The scanning electron microscope and element content diagram of the rare earth-doped hydrotalcite prepared in Examples 1-2;

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

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

[0025] Figure 5 This is a tracer diagram of the conduction of the rare earth-doped hydrotalcite-loaded nanopesticide in plants prepared in Example 1;

[0026] Figure 6 This is the intraplant conduction tracing diagram of the rare earth-doped hydrotalcite-loaded nanopesticide prepared in Example 2. DETAILED DESCRIPTION

[0027] The invention provides a rare earth doped hydrotalcite supported nano pesticide, comprising rare earth doped hydrotalcite and a pesticide active ingredient supported on the rare earth doped hydrotalcite.

[0028] In the present invention, the structural formula of the rare earth doped hydrotalcite is (M 1 ) x (M 2 M 3 )y (OH) 2 (A) y ·zH 2 O, where M 1 Mg 2+ , Ca 2+ and Zn 2+ One or more of M 2 Fe 3+ Cr 3+ and Al 3+ One or more of M 3 It is a rare earth metal ion with optical properties, A is an interlayer intercalation molecule with negative charge, x is 0.2-0.5, y=1-x, and z is 4-10.

[0029] In the present invention, the rare earth metal ions having optical properties preferably include Eu 3+ and Tb 3+ The present invention provides fluorescent signals through rare earth metal ions to trace the absorption and transport behavior of rare earth-doped hydrotalcite-loaded nanopesticides in plants.

[0030] In the present invention, the negatively charged interlayer 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; the organic molecules preferably include one or more of salicylic acid, succinic acid, adipic acid, p-hydroxybenzoic acid and triethanolamine.

[0031] In the present invention, zH 2 O is the crystal water adsorbed by the rare earth-doped hydrotalcite.

[0032] In the present invention, the particle size of the rare earth doped hydrotalcite is preferably 10-300 nm, specifically 100 nm or 200 nm. The present invention optimizes the electron density and energy band structure by rare earth doping, so that the rare earth doped hydrotalcite as a whole has ultraviolet light response characteristics.

[0033] In the present invention, the method for preparing rare earth-doped hydrotalcite comprises the following steps: 1 Metal salt, M 2 Metal salt, M 3 The metal salt, surfactant, alkali and water are mixed (referred to as the first mixing to obtain the first mixed solution) and then sheared and emulsified (referred to as the first shear emulsification) to obtain the rare earth-doped hydrotalcite.

[0034] In the present invention, the M 1The metal salt is preferably a divalent soluble metal salt; the divalent soluble metal salt preferably includes one or more of a magnesium salt, a calcium salt and a zinc salt; the magnesium salt preferably includes one or more of an inorganic magnesium salt and an 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 the present invention, the calcium salt preferably includes one or more of an inorganic calcium salt and an organic calcium salt; the inorganic calcium salt preferably includes one or more of calcium nitrate, calcium chloride and calcium sulfate; the organic calcium salt is preferably calcium acetate.

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

[0037] In the present invention, the M 2 The 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 alcohol 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 both of ferric citrate and ferric acetate; the metal alcohol iron salt is preferably ferric ethanolate.

[0038] In the present invention, the chromium salt preferably includes one or more of an inorganic chromium salt, an organic acid chromium salt and a metal alcohol chromium salt; 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; the metal alcohol chromium salt is preferably chromium isopropoxide.

[0039] In the present invention, the aluminum salt preferably includes one or more of an inorganic aluminum salt, an organic acid aluminum salt and a metal alcohol aluminum salt; 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; the metal alcohol aluminum salt is preferably aluminum isopropoxide.

[0040] In the present invention, the M 1 Metal salts and M 2 The molar ratio of the metal salt is preferably 2 to 4:1, specifically 2:1, 2.5:1, 3:1, 3.5:1 or 4:1.

[0041] In the present invention, the M 3 The 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 the present invention, the M 2Metal salts and M 3 The molar ratio of the metal salt is preferably 99-90:1-10, and specifically may be 99:1, 95:5 or 90:10.

[0043] In the present invention, the first mixed solution contains 1 Metal salt, M 2 Metal salts and M 3 The total concentration of the metal salt 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 the present 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 the present invention, the alkali preferably includes one or more of urea, ammonia water, sodium hydroxide and potassium hydroxide, and more preferably sodium hydroxide.

[0046] In the present invention, the molar ratio of the surfactant to the base 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 the present invention, the concentration of the alkali in the first mixed solution 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 the present invention, the first mixing is preferably: M 1 Metal salt, M 2 Metal salts and M 3 The metal salt is mixed with a portion of water to obtain a metal salt solution, the base and the surfactant are mixed with the remaining portion of water to obtain a surfactant alkali solution, and then the metal salt solution and the surfactant alkali solution are mixed.

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

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

[0051] In the present invention, the first shear emulsification device is preferably a colloid mill; the first shear emulsification speed is preferably 3000-8000rpm, specifically 3000rpm, 5000rpm, 6000rpm or 8000rpm; the first shear emulsification time is preferably 1-4min, specifically 2min or 3min. During the shearing process, the metal salt and the alkali in the two solutions undergo a coprecipitation reaction, and their growth process is controlled by shearing, and they fully interact with the surfactant to achieve the purpose of controlling their size and realizing surface hydrophobic modification.

[0052] In the present invention, the first shear emulsification preferably further comprises centrifuging the obtained product and then washing; 1 Metal salt, M 2 Metal salts and M 3 The metal salts are all inorganic salts, and the washing agent is water; the water is preferably deionized water; the washing standard is preferably a pH value of the supernatant of 7.0±0.5; when M 1 Metal salt, M 2 Metal salts and M 3 The metal salts are not all inorganic salts. The washing is preferably performed alternately by water washing and alcohol washing. The alcohol used in the alcohol washing is preferably ethanol. The water used for the water washing is preferably deionized water. The standard for the washing is preferably that the pH value of the supernatant is 7.0±0.5.

[0053] In the present invention, the active ingredients of the pesticide preferably include one or more of chemical synthesis pesticides and biological fermentation pesticides; the chemical synthesis pesticides preferably include one or more of chlorantraniliprole and pyrethroid pesticides; the pyrethroid pesticides preferably include one or more of cypermethrin, deltamethrin, cyfluthrin and cyhalothrin; the biological fermentation pesticide is preferably avermectin.

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

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

[0056] The rare earth doped hydrotalcite, the pesticide active ingredient and the good solvent are mixed (referred to as the second mixing), self-assembled and loaded, and then sheared and emulsified (referred to as the second shear emulsification) to obtain the rare earth doped hydrotalcite loaded nano pesticide.

[0057] In the present invention, the good solvent preferably includes one or more of ketones, halogenated hydrocarbons, alcohols and amide solvents, and is more preferably an amide solvent; the ketone is preferably acetone; the halogenated hydrocarbon is preferably dichloromethane; the alcohol is preferably methanol; and the amide solvent is preferably dimethylformamide (DMF).

[0058] In the present invention, the mass ratio of the rare earth doped hydrotalcite to the good solvent is preferably 1.0 g / L to 100.0 g / L, specifically 2.0 g / L or 50.0 g / L. The present invention determines the amount of rare earth doped hydrotalcite and the pesticide active ingredient according to the loading ratio of the rare earth doped hydrotalcite-loaded nanopesticide.

[0059] In the present invention, the second mixing is preferably: mixing rare earth-doped hydrotalcite and part of the good solvent to obtain a rare earth-doped hydrotalcite solution, mixing the pesticide active ingredient and the remaining part 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. In the present invention, the raw materials are fully stirred until they are uniformly dispersed through the second mixing.

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

[0061] In the present 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; the temperature of the second shear emulsification is preferably 10-30°C, specifically 20°C or 25°C.

[0062] In the present invention, after the second shear emulsification, preferably the obtained emulsified system is further desolventized; the desolventization is preferably performed by rotary evaporation; the temperature of the rotary evaporation is preferably 50 to 100° C., specifically 80° C.; the time of the rotary evaporation is preferably 0.5 to 6 h, specifically 2 h.

[0063] The present invention also provides the use of the rare earth doped hydrotalcite-loaded nanopesticide described in the above scheme or the rare earth doped hydrotalcite-loaded nanopesticide obtained by the preparation method described in the above scheme in the prevention and control of crop diseases and insect pests.

[0064] The rare earth-doped hydrotalcite-loaded nanopesticide provided by the invention is suitable for preventing and controlling plant diseases and insect pests in crops, and is particularly suitable for crops such as cucumbers, cabbages and strawberries.

[0065] In the present invention, the application preferably includes the following steps: diluting the rare earth-doped hydrotalcite-loaded nanopesticide and then applying it.

[0066] In the present invention, the dilution obtains a dilution liquid, and the concentration of the dilution liquid is preferably 0.02-0.2 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 the present invention, the application preferably includes spraying, soil application, root irrigation or stem injection; the number of applications is preferably 2 to 5 times, specifically 3 times; when the application is spraying or soil application, the application amount of the rare earth-doped hydrotalcite-loaded nanopesticide is preferably 1 to 2 g of active ingredient per mu.

[0068] In order to further illustrate the present invention, the scheme of the present invention is described in detail below in conjunction with the accompanying drawings and embodiments, but they should not be understood as limiting the protection scope of the present invention.

[0069] Example 1

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

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

[0072] (3) quickly mixing the metal salt solution and the surfactant alkali solution in a colloid mill, maintaining a rotation speed of 5000 rpm, and co-precipitating for 2 minutes to obtain a 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 redispersion, with ultrasound assistance if necessary, to obtain a uniform and stable nano-dispersion system.

[0074] (5) After 3 g of chlorfenapyr original drug (95% content) is completely dissolved in DMF to obtain a clear solution, the clear solution is mixed with the nano-dispersion system prepared in step (4) and continued to be sheared and emulsified, the rotation speed is maintained at 3000 rpm, and the reaction is carried out for 3 min. The obtained solution is rotary evaporated at 80° C. for 2 h to remove DMF to obtain a rare earth-doped hydrotalcite-loaded nanopesticide, and the volume is fixed to 500 mL, and the effective dose concentration is 5.7 g / L.

[0075] Example 2

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

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

[0078] (3) quickly mixing the metal salt solution and the surfactant alkali solution in a colloid mill, maintaining a rotation speed of 6000 rpm, and co-precipitating for 3 minutes to obtain a hydrotalcite solution;

[0079] (4) The prepared hydrotalcite solution was centrifuged at a speed of 8000 rpm for 10 min. The supernatant was removed, water was added to redisperse, and the solution was centrifuged again. The solution was centrifuged repeatedly until the supernatant was neutral.

[0080] (5) The prepared hydrotalcite solution was centrifuged at a speed of 6000 rpm for 10 min. The supernatant was removed, and 5 g of the hydrotalcite carrier was added into 100 mL of water for redispersion, with ultrasound assistance if necessary, to obtain a uniform and stable nano-dispersion system.

[0081] (6) After 10 g of avermectin original drug (95% content) was completely dissolved in acetone to obtain a clear solution, the clear solution was mixed with the nano-dispersion system prepared in step (4) and continued to shear emulsify, maintaining a rotation speed of 3000 rpm for 2 min, and the obtained solution was rotary evaporated at 80° C. for 2 h to remove acetone to obtain a rare earth-doped hydrotalcite-supported nanopesticide, which was fixed to 500 mL and had an effective dose concentration of 19.0 g / L.

[0082] Test Example 1

[0083] The morphology of the rare earth doped hydrotalcite prepared in Examples 1 and 2 was characterized. Figure 2 According to Figure 2 It can be seen that the rare earth elements are evenly distributed in the hydrotalcite structure.

[0084] Test Example 2

[0085] The XRD spectrum of the rare earth doped hydrotalcite supported nanopesticide prepared in Example 1 was tested, and the results were as follows: Figure 3 As shown; the rare earth doped hydrotalcite supported nanopesticide prepared in Example 2 was tested by scanning electron microscope, and the results were as follows Figure 4 As shown. Figure 3 and Figure 4It can be seen that in the rare earth-doped hydrotalcite-loaded nanopesticides, the assembled hydrotalcite-based chlorfenapyr and avermectin have a lamellar structure with a size of about 100 nm.

[0086] Test Example 3

[0087] The rare earth-doped hydrotalcite-loaded nanopesticide prepared in Example 1 was traced in plants, and photos of the fluorescently labeled nanopesticide entering the plant through the root of the plant were taken. The migration tracer was as follows: Figure 1 The test results are shown in Figure 5 As shown. Figure 5 It can be seen that after spraying, the effective concentration of chlorfenapyr in the plants reached 18.72 ppm. Using laser confocal microscopy and the red excitation light of europium as a signal, the plant absorption and migration characteristics of rare earth-doped hydrotalcite-loaded nanopesticides mediated by hydrotalcite carriers were traced.

[0088] The rare earth-doped hydrotalcite-loaded nanopesticide prepared in Example 2 was traced in plants, and photos of the fluorescently labeled nanopesticide entering the plants through the roots were taken. The test results are as follows: Figure 6 As shown. Figure 6 It can be seen that avermectin-loaded nanopesticides can be absorbed into plants through the roots, with an effective concentration of 73.46 ppm in the plants. Through ultraviolet light excitation, the yellow-green excitation light of terbium element is used as a signal to trace the plant absorption and migration characteristics of the nanopesticide structure mediated by the hydrotalcite carrier.

[0089] Test Example 4

[0090] Strawberry and cabbage were used as experimental crops, and the rare earth-doped hydrotalcite-loaded nanopesticides prepared in Examples 1 and 2 were evaluated for their control effects. The evaluation method was as follows: the rare earth-doped hydrotalcite-loaded nanopesticide prepared in Example 1 was diluted 500 times, and root irrigation treatment was performed on the strawberry seedlings on the 15th day, and soil application was performed once a day for 3 times. The aphid control effect was analyzed, and a commercially available agent was used as a control group. The results are shown in Table 1. The rare earth-doped hydrotalcite-loaded nanopesticide prepared in Example 2 was diluted 500 times, and single leaf spraying was performed on the cabbage seedlings on the 15th day, and spraying was performed once a day for 3 times. The leaves that were not sprayed were picked to feed the diamondback moth, and the commercially available agent was used as a control group. The insecticidal effect was analyzed, and the results are shown in Table 2.

[0091] Table 1 Example 1 Rare earth doped hydrotalcite supported nano pesticides against strawberry aphids

[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 Example 2 Rare earth doped hydrotalcite supported nano pesticides against cabbage diamondback moth

[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] According to Tables 1 and 2, it can be seen that the rare earth-doped hydrotalcite-loaded nanopesticides chlorantraniliprole and avermectin have obvious advantages in protection effect compared with traditional formulations about 3 days after application; it can be seen that under the mediation of rare earth-doped hydrotalcite carriers, the active ingredients of pesticides can migrate and transport within the plants, achieving efficient prevention and control of diseases and pests.

[0096] It can be seen from the above examples that the rare earth-doped hydrotalcite-loaded nanopesticide provided by the present invention has good optical properties, can trace the migration path and enrichment law of the pesticide, enhance the systemicity of the pesticide, and improve the utilization rate of the pesticide.

[0097] Although the above embodiment describes the present invention in detail, it is only a part of the embodiments of the present invention, not all of the embodiments. Other embodiments can be obtained based on this embodiment without creativity, 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: The invention comprises rare earth-doped hydrotalcite and a pesticide active ingredient loaded on the rare earth-doped hydrotalcite; the rare earth-doped hydrotalcite has a structural formula (M1): x (M2M3) y (OH)2(A) y ·zH2O, where M1 is Mg 2+ , Ca 2+ and Zn 2+ One or more of the following, M2 is Fe 3+ Cr 3+ and Al 3+ One or more of the above, M3 is a rare earth metal ion with optical properties, A is an interlayer intercalation molecule with a negative charge, x is 0.2 to 0.5, y=1-x, and z is 4 to 10.

2. The rare earth-doped hydrotalcite-supported nanopesticide according to claim 1, characterized in that: The active ingredients of the pesticide include one or more of chemically synthesized pesticides and biologically fermented pesticides.

3. The rare earth-doped hydrotalcite-supported nanopesticide according to claim 1 or 2, characterized in that: The content of the pesticide active ingredient in the rare earth-doped hydrotalcite-supported nano-pesticide is 20-60wt%.

4. The rare earth-doped hydrotalcite-supported nanopesticide according to claim 1, characterized in that: The particle size of the rare earth doped hydrotalcite is 10 to 300 nm.

5. The rare earth-doped hydrotalcite-supported nanopesticide according to claim 1 or 4, characterized in that: The rare earth metal ions having optical properties include Eu 3+ and Tb 3+ One or more of the .

6. The rare earth-doped hydrotalcite-supported nanopesticide according to claim 1 or 4, characterized in that: The negatively charged interlayer intercalation molecules include one or more of inorganic anions and organic molecules.

7. The method for preparing the rare earth-doped hydrotalcite-supported nanopesticide according to any one of claims 1 to 6, characterized in that: The following steps are involved: The rare earth doped hydrotalcite, the pesticide active ingredient and the good solvent are mixed for self-assembly loading and then shear emulsification to obtain the rare earth doped hydrotalcite loaded nano pesticide.

8. The preparation method according to claim 7, characterized in that: The rotation speed of the shear emulsification is 3000-10000 rpm, and the time of the shear emulsification is 1-10 min.

9. The preparation method according to claim 7, characterized in that: The temperature of the self-assembled load is 10-30°C.

10. Use of the rare earth doped hydrotalcite-supported nanopesticide according to any one of claims 1 to 6 or the rare earth doped hydrotalcite-supported nanopesticide obtained by the preparation method according to any one of claims 7 to 9 in the prevention and control of crop diseases and insect pests.

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