A titanium-selenium composite sol for degradation of agricultural product residue pesticides and its preparation method and application

A technology of composite sol and agricultural products, applied in the directions of botanical equipment and methods, application, agriculture, etc., can solve the problems of harsh equipment requirements, long production time, unsuitable for large-scale production, etc., achieves a simple preparation method, avoids subsequent processing processes, Good synergistic effect

Active Publication Date: 2020-08-28
GUANGDONG INST OF ECO ENVIRONMENT & SOIL SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Ion doping methods mainly include ion implantation method, photochemical deposition method, hydrothermal method, etc. These methods take a long time to produce and have strict requirements on equipment, so they are not suitable for large-scale production
However, the use of selenium for synergistic TiO 2 Report on reducing pesticide residues in crops

Method used

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  • A titanium-selenium composite sol for degradation of agricultural product residue pesticides and its preparation method and application
  • A titanium-selenium composite sol for degradation of agricultural product residue pesticides and its preparation method and application
  • A titanium-selenium composite sol for degradation of agricultural product residue pesticides and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] In this example, titanium selenium composite sol A is prepared from metatitanic acid as raw material:

[0027] Weigh 80g of industrial metatitanic acid raw material, add water and mix evenly, take 0.4g of sodium selenite to dissolve, then add to the metatitanic acid slurry and mix evenly; add excess sodium hydroxide solution dropwise to adjust the pH to 9.0, and stir at room temperature for 4 hours, then filter and wash the precipitate; beat the washed filter cake again, add excess potassium hydroxide dropwise to adjust the pH to 9.0, heat and stir at 40°C for 4 hours, then repeatedly filter and wash until no impurity ions are detected, and then use Repeated washing with distilled water until neutral, in this way, the impurity ions can be basically removed; finally, the precipitate after removing the impurity ions is mixed with water and beaten. Then mix the slurry with water, add a certain volume of 10% nitric acid solution dropwise to make the pH value 1.0, stir at ro...

Embodiment 2

[0029] In this example, titanyl sulfate is used as raw material to prepare titanium-selenium composite sol B:

[0030] Weigh 120g of titanyl sulfate raw material, add water and mix well, take 1.2g of sodium selenite to dissolve, then add to titanyl sulfate slurry and mix evenly; add excess ammonia water dropwise to adjust pH to 10.0, stir at room temperature for 6 hours, then filter Wash the precipitate; beat the washed filter cake again, add excess potassium hydroxide dropwise to adjust the pH to 10.0, heat and stir at 40°C for 4 hours, then repeatedly filter and wash until no impurity ions are detected (mainly sulfate ions, with 0.5M barium chloride solution titration detection), and then repeatedly washed with distilled water until neutral, so that the impurity ions can be basically removed; finally, the precipitate after removing the impurity ions is mixed with water and beaten. Then mix the slurry with water, dropwise add a certain volume of 10% nitric acid solution to ma...

Embodiment 3

[0032] In this example, titanium-selenium composite sol C is prepared from metatitanic acid as raw material:

[0033] Weigh 200g of metatitanic acid raw material, add water and mix well, take 4.0g of sodium selenite to dissolve, then add to the metatitanic acid slurry and mix well; drop excess potassium hydroxide solution to adjust the pH to 11.0, stir at room temperature for 4 hours , then filter and wash the precipitate; beat the washed filter cake again, add excess potassium hydroxide dropwise again to adjust the pH to 11.0, heat and stir at 40°C for 4 hours, then repeatedly filter and wash until no impurity ions are detected, and then use distilled water Repeated washing until neutral, so that the impurity ions can be basically removed; finally, the precipitate after removing the impurity ions is mixed with water and beaten. Then mix the slurry with water, dropwise add a certain volume of 10% nitric acid solution to make the pH value 2.0, stir at room temperature for 12 ho...

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Abstract

The invention belongs to the technical field of functional sol preparation and application, and discloses a titanium selenium composite sol for agricultural product residual pesticide degradation, a preparation method of the sol and an application of the sol. The preparation method includes the steps: jointly dissolving or dispersing inorganic titanium sources and inorganic selenium salt in water; adding alkaline solution under a stirring condition until pH (potential of hydrogen) of the solution is 9-11; filtering and washing deposits to remove impurity ions, adding water, uniformly mixing the water and the deposits and performing beating; adding acid solution and adjusting the pH value to range from 1 to 2; performing water-bath heating for 15-25 hours under the stirring condition at the temperature of 60-70 DEG C to obtain the titanium selenium composite sol. Selenium is doped into titanium dioxide sol, the selenium-doped titanium dioxide sol with an appropriate concentration displays higher photocatalytic activity, has good synergistic effects and can be applied to pesticide residues in agricultural products.

Description

technical field [0001] The invention belongs to the technical field of preparation and application of functional sols, and in particular relates to a titanium-selenium composite sol used for degradation of agricultural product residue pesticides and its preparation method and application. Background technique [0002] In modern agricultural production, pesticides are an important means of production for preventing pests and diseases, ensuring agricultural harvests, and ensuring food supply. The use of pesticides has effectively reduced the occurrence of pests and diseases, and played a positive role in promoting the increase of agricultural production and income. However, with the continuous increase in the variety and quantity of pesticides, large-scale application of pesticides, and irregular management and other factors, the long-term and large-scale use and abuse of some pesticide residues often lead to pesticide pollution problems, and pesticide residues in crops will s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A01N25/32A01G13/00
CPCA01G22/00A01N25/32
Inventor 吕亚辉刘承帅李芳柏吴非陈梦华
Owner GUANGDONG INST OF ECO ENVIRONMENT & SOIL SCI
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