Preparation and application of a chitosan-encapsulated mesoporous carbon nano-herbicide

A technology of chitosan and mesoporous carbon, applied in the direction of herbicides and algicides, applications, biocides, etc., to achieve the effects of unaffected morphology, large specific surface area, and reduced fatal toxicity

Active Publication Date: 2022-02-08
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The current commercial preparations and existing related research results mainly reduce the absorption of paraquat in the gastrointestinal tract by adding emetic agents and laxatives, but it is difficult to solve the problem of user safety and friendliness while maintaining high-efficiency herbicidal effects problem

Method used

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  • Preparation and application of a chitosan-encapsulated mesoporous carbon nano-herbicide
  • Preparation and application of a chitosan-encapsulated mesoporous carbon nano-herbicide
  • Preparation and application of a chitosan-encapsulated mesoporous carbon nano-herbicide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Embodiment 1 A kind of preparation method of the mesoporous carbon nano-herbicide encapsulated by chitosan

[0034] Include the following steps:

[0035] (1) Add 0.6g of phenol and 2.1mL of formaldehyde solution (mass fraction is 37%) to 15mL of 0.1M NaOH aqueous solution, stir at 70°C for 0.5h to obtain a low molecular weight phenolic resin; then add 0.96g of three The colloidal solution prepared by dispersing the block copolymer Pluronic F127 in 15mL of water was stirred at a low speed of 69°C for 2-4h; then 50mL of water was added to dilute the solution, and the stirring was continued for 16-18h. Stop the reaction when the precipitate appears, let it stand until the precipitate gradually dissolves, measure 17.7mL of the obtained solution, add it to the reaction kettle, add 56mL of water to dilute the solution, and react at 130°C for 24h. After cooling to room temperature, wash with water three to four times, centrifuge to collect and dry the crude product; then carb...

experiment example 2

[0041] Experimental Example 2 Pesticide Controlled Release Test:

[0042] Weigh multiple equal amounts of 5 mg PQ@MCN@CS nano-pesticide formulations, place them in dialysis bags, and then place them in 0.1% Tween-80 aqueous solutions at pH 2.0, pH 3.0, pH 5.0, pH 7.4 and pH 9.0 0.2mL samples were taken at different time intervals, and an equal volume of corresponding fresh solution 0.2mL was added, and determined by HPLC. In addition, pH 3.0 and pH 2.0 + different temperature (25, 37, 42 and 50°C) dual stimulus-responsive controlled release pesticides were designed, and the determination steps were the same as above.

[0043] Figure 4 is the acid / alkali response controlled release curve of PQ@MCN@CS nano-pesticide formulation: after 14 days, the cumulative release rate of paraquat in the control group without any stimulation was only 5.1%, almost no paraquat was released; at pH The cumulative release rates of paraquat at pH 9.0, pH 7.4, pH 5.0, pH 3.0 and pH 2.0 were 5.3%, ...

Embodiment 3

[0047] Embodiment 3 herbicidal effect test:

[0048] The aqueous dispersions of MCN@CS (3 mg / mL) and PQ@MCN@CS (1 and 3 mg / mL) (the solvent is 0.1% Tween-80 aqueous solution) were sprayed on outdoor planted Bermudagrass to investigate the effect on The influence of grass growth, in addition, 0.16mg / mL paraquat was used as a positive control, and 0.1% Tween-80 aqueous solution was used as a solvent control. The above-mentioned aqueous dispersions of nanoparticles with different concentrations and the control group were sprayed with Bermudagrass planted outdoors, and photographed to record the growth of Bermudagrass at different times after spraying.

[0049] Figure 7 It shows that the solvent control group and MCN@CS have no effect on the growth of Bermudagrass; the paraquat positive control group will show signs of withering on the second day after spraying (that is, one day of drug action), and as the action time increases, the weeding The effect is more and more obvious; ...

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Abstract

The invention discloses a preparation method of a chitosan-encapsulated mesoporous carbon nano-herbicide. The carboxylated mesoporous carbon nano-particle is used as the carrier of the herbicide, and the herbicide molecule is strongly adsorbed in the solution, and then the herbicide is absorbed in an aqueous acetic acid solution. In this study, the herbicide-loaded mesoporous carbon nanoparticles were encapsulated by chitosan. The chitosan-encapsulated mesoporous carbon nano-herbicide in the present invention has almost no obvious release in the aqueous solution ranging from strongly acidic to alkaline, which greatly reduces the absorption of the herbicide in the human gastrointestinal tract. Mesoporous carbon nanoparticles have a good near-infrared photothermal effect, and gradually release the encapsulated herbicide molecules under natural sunlight irradiation. Effect. The nano-pesticide preparation of the invention has good biocompatibility, low cost, simple preparation process, less toxic and side effects on human body, and realizes the controlled release performance of the nano-herbicide responsive to sunlight.

Description

technical field [0001] The invention belongs to the field of preparation of nano-pesticide preparations; in particular, it relates to the preparation and application of a chitosan-encapsulated mesoporous carbon nano-herbicide. Background technique [0002] Paraquat is the most widely used efficient non-selective herbicide in the world. It achieves the purpose of weed control by preventing the photosynthesis of plant green tissue; when paraquat contacts the soil, it loses its activity and does not damage the plant roots. It cannot be ignored that when people accidentally or intentionally swallow commercial paraquat preparations, they can cause fatal toxicity to the human body, mainly manifested in pulmonary toxicity. Currently, there is no effective antidote to save the lives of those who swallow it. For this reason, some countries have banned the production and sale of paraquat herbicide. However, paraquat is still widely used in many countries due to its high weed control ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A01N25/08A01N25/28A01N43/40A01P13/00
CPCA01N25/08A01N25/28A01N43/40
Inventor 杜学忠董江涛
Owner NANJING UNIV
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