Tea saponin nanocomposite fertilizer and preparation method thereof

Abstract

The invention relates to the technical field of fertilizers, in particular to a tea saponin nano composite material fertilizer which comprises the following components in percentage by weight: 5-15% of tea saponin, 2-6% of carbon nanotubes, 1-3% of nano silicon dioxide, 1-5% of humic acid, 0.5-2% of trace elements and the balance of water. The preparation method of the tea saponin nano composite material fertilizer provided by the invention comprises the following steps: mixing the modified nano material with the tea saponin, the humic acid and the water according to the proportion; adding chelated trace elements according to the proportion; and carrying out spray drying on the mixed suspension. The tea saponin nano composite material fertilizer disclosed by the invention not only can improve the bioavailability of nutrients and the utilization efficiency of the fertilizer, but also can enhance the growth and disease and pest resistance of crops.

Description

Technical Field

[0001] The invention relates to the technical field of fertilizers, in particular to a tea saponin nano composite fertilizer and a preparation method thereof. Background Art

[0002] Tea saponin, a natural surfactant extracted from the Camellia family, has been shown to promote plant growth and enhance crop resistance to pests and diseases. The introduction of carbon nanotubes and nano-silicon dioxide enhances the adsorption and dispersion of fertilizers, thereby improving the bioavailability of nutrients. In addition, the slow-release properties of nanocomposites help reduce nutrient loss, improve fertilizer utilization efficiency, and reduce potential pollution risks to water and soil. Tea saponin nanocomposite fertilizers show significant potential for agricultural applications by integrating the biological activity of tea saponin with the unique physical and chemical properties of nanomaterials.

[0003] Existing fertilizer systems, especially chemical fertilizers, can quickly increase crop yields in the short term, but their long-term use may lead to soil structure degradation, soil acidification, and decreased microbial activity, which in turn affects crop quality. In addition, the nutrients in chemical fertilizers are relatively single, and they often need to be used in combination with other types of fertilizers to meet the needs of crops for multiple nutrients. Although organic fertilizers can provide more comprehensive nutrients, their nutrient release rate is slow, and their fertilizer effect is not as rapid as chemical fertilizers, which limits their application in modern agricultural production. In addition, improper use of traditional fertilizers may lead to soil nutrient imbalance, affecting the long-term fertility and ecological balance of the soil. Summary of the invention

[0004] In view of the above-mentioned deficiencies in the prior art, the present invention provides a tea saponin nanocomposite fertilizer and a preparation method thereof, aiming to develop a new type of composite fertilizer. The fertilizer can not only improve the bioavailability of nutrients and fertilizer utilization efficiency, but also enhance crop growth and pest resistance. To achieve the above-mentioned purpose, the present invention provides the following technical solutions:

[0005] A tea saponin nano composite fertilizer comprises the following components in percentage by weight: 5-15% tea saponin, 2-6% nano carbon tubes, 1-3% nano silicon dioxide, 1-5% humic acid, 0.5-2% trace elements and the balance water.

[0006] Furthermore, the average particle size of the nano carbon tubes and nano silicon dioxide is between 1 and 100 nanometers, and the surface is modified to enhance the compatibility and adsorption performance with tea saponin.

[0007] Furthermore, the surface modification of the carbon nanotubes comprises the following steps:

[0008] (1) dispersing carbon nanotubes in water and ultrasonically treating the water at 40° C. for 2.5 hours to form a uniform suspension;

[0009] (2) adding a mixed solution of concentrated sulfuric acid and concentrated nitric acid in a volume ratio of 3:1 and ultrasonically treating at room temperature for 6 hours;

[0010] (3) After standing for 3 hours, filter and rinse repeatedly with distilled water until the filtrate is neutral;

[0011] (4) Vacuum drying at 30°C for 24 hours to obtain modified carbon nanotubes.

[0012] Furthermore, the surface modification of the nano-silicon dioxide comprises the following steps:

[0013] (1) drying the nano-silicon dioxide at 120° C. for 12 hours;

[0014] (2) heat treating the dried nano-silicon dioxide at 200-400° C. for 10 hours;

[0015] (3) After cooling to room temperature, add 1-5% of the mass of nano-silicon dioxide zinc sulfate and react at 60° C. for 4 hours;

[0016] (4) After standing for 3 hours, filter and rinse repeatedly with distilled water until the filtrate is neutral;

[0017] (5) vacuum drying at 30°C for 24 hours to obtain modified nano-silica.

[0018] Furthermore, the trace elements include iron, manganese, zinc, copper, boron and molybdenum, which exist in chelated form.

[0019] Furthermore, the method for preparing the chelated trace elements comprises the following steps:

[0020] (1) mixing a trace element salt solution and ethylenediaminetetraacetic acid in a molar ratio of 1:1, stirring at a pH of 7.0±0.5, room temperature to 60° C., and 200-400 rpm for 4 hours;

[0021] (2) After standing for 3 hours, filter and rinse repeatedly with distilled water until the filtrate is neutral;

[0022] (3) Dry under vacuum at 30°C for 24 hours to obtain chelated trace elements.

[0023] The method for preparing the tea saponin nanocomposite fertilizer comprises the following steps:

[0024] (1) mixing the modified nanomaterial with tea saponin, humic acid and water according to a ratio to form a uniform suspension;

[0025] (2) adding chelated trace elements according to the proportion;

[0026] (3) spray drying the mixed suspension to obtain a tea saponin nanocomposite fertilizer.

[0027] Compared with the prior art, the present invention has the following beneficial effects:

[0028] 1. Improve the bioavailability of nutrients and fertilizer utilization efficiency.

[0029] 2. Enhance crop growth and resistance to diseases and pests. DETAILED DESCRIPTION

[0030] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] Embodiment 1:

[0032] 2 kg of carbon nanotubes (average particle size 50 nanometers), 1 kg of nano silicon dioxide (average particle size 30 nanometers), 5 kg of tea saponin, 1 kg of humic acid and 90.5 kg of water were mixed to form a suspension.

[0033] Add 0.5kg of chelated trace elements.

[0034] The suspension is made into fertilizer granules by spray drying technology.

[0035] Embodiment 2:

[0036] 5 kg of nano carbon tubes (average particle size 80 nanometers), 2 kg of nano silicon dioxide (average particle size 20 nanometers), 10 kg of tea saponin, 3 kg of humic acid and 79 kg of water were mixed to form a suspension.

[0037] Add 1kg of chelated trace elements.

[0038] The suspension is made into fertilizer granules by spray drying technology.

[0039] Embodiment 3:

[0040] 3 kg of nano carbon tubes (average particle size 40 nanometers), 1.5 kg of nano silicon dioxide (average particle size 60 nanometers), 8 kg of tea saponin, 2 kg of humic acid and 84 kg of water were mixed to form a suspension.

[0041] Add 1.5 kg of chelated trace elements.

[0042] The suspension is made into fertilizer granules by spray drying technology.

[0043] The above content is a further detailed description of the present invention in combination with specific implementation methods. It cannot be considered that the specific implementation of the present invention is limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, simple modifications and substitutions made without departing from the concept of the present invention should be deemed to belong to the scope of protection of the present invention.

Claims

1. A tea saponin nanocomposite fertilizer, characterized in that: The components are as follows according to weight percentage: 5-15% tea saponin, 2-6% nano carbon tubes, 1-3% nano silicon dioxide, 1-5% humic acid, 0.5-2% trace elements, and the balance water.

2. The tea saponin nanocomposite fertilizer according to claim 1, characterized in that: The average particle diameters of the nano carbon tubes and nano silicon dioxide are between 1 and 100 nanometers, and the surfaces are modified to enhance the compatibility and adsorption performance with tea saponin.

3. The tea saponin nanocomposite fertilizer according to claim 1, characterized in that: The surface modification of the carbon nanotubes comprises the following steps: (1) dispersing carbon nanotubes in water and ultrasonically treating the water at 40° C. for 2.5 hours to form a uniform suspension; (2) adding a mixed solution of concentrated sulfuric acid and concentrated nitric acid in a volume ratio of 3:1 and ultrasonically treating at room temperature for 6 hours; (3) After standing for 3 hours, filter and rinse repeatedly with distilled water until the filtrate is neutral; (4) Vacuum drying at 30°C for 24 hours to obtain modified carbon nanotubes.

4. The tea saponin nanocomposite fertilizer according to claim 1, characterized in that: The surface modification of the nano-silicon dioxide comprises the following steps: (1) drying the nano-silicon dioxide at 120° C. for 12 hours; (2) heat treating the dried nano-silicon dioxide at 200-400° C. for 10 hours; (3) After cooling to room temperature, add 1-5% of the mass of nano-silicon dioxide zinc sulfate and react at 60° C. for 4 hours; (4) After standing for 3 hours, filter and rinse repeatedly with distilled water until the filtrate is neutral; (5) vacuum drying at 30°C for 24 hours to obtain modified nano-silica.

5. The tea saponin nanocomposite fertilizer according to claim 1, characterized in that: The trace elements include iron, manganese, zinc, copper, boron and molybdenum, which exist in the form of chelated state.

6. The tea saponin nanocomposite fertilizer according to claim 1, characterized in that: The preparation method of the chelated trace elements comprises the following steps: (1) mixing a trace element salt solution and ethylenediaminetetraacetic acid in a molar ratio of 1:1, stirring at a pH of 7.0±0.5, room temperature to 60° C., and 200-400 rpm for 4 hours; (2) After standing for 3 hours, filter and rinse repeatedly with distilled water until the filtrate is neutral; (3) Dry under vacuum at 30°C for 24 hours to obtain chelated trace elements.

7. The method for preparing the tea saponin nanocomposite fertilizer according to any one of claims 1 to 6, characterized in that: The following steps are involved: (1) mixing the modified nanomaterial with tea saponin, humic acid and water according to a ratio to form a uniform suspension; (2) adding chelated trace elements according to the proportion; (3) spray drying the mixed suspension to obtain a tea saponin nanocomposite fertilizer.