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Chelation group-containing chitosan and preparation method and application thereof

A chelating group and chitosan technology, applied in the field of chitosan, can solve the problems of secondary pollution, limit the wide application of chemical methods, soil residue, etc., achieve increased chelating capacity, cheap preparation raw materials, and simple use methods Effect

Inactive Publication Date: 2012-03-28
BEIJING OKEANOS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

2. Pesticide residues in the soil have seriously affected agricultural production
The irrational use of pesticides leads to frequent injury accidents, which often lead to large-scale production reduction or even extinction of crops; many pesticides have a long half-life, and will remain in the soil for a long time after application, which is very easy to cause phytotoxicity to sensitive crops in the future.
3. Pesticide residues have seriously affected import and export trade
Excessively high pesticide residues seriously damaged the international image of our country and caused great economic losses to our country
4. Pesticide residues have caused serious environmental pollution
[0012] For chemical degradation methods, chemical degradation may cause secondary pollution, and even change non-toxic or low-toxic substances into toxic or more toxic substances, thus limiting the use of chemical methods in degrading pesticide residues to a large extent. Wide application on

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] 1. Preparation of Chitosan C

[0054] 1) get 100 grams of commercially available chitosan (molecular weight is 10KDa, deacetylation is 88%), repeatedly washes with 500 milliliters of isopropanols, filters, obtains chitosan A after drying;

[0055] 2) Add chitosan A to 625 ml of isopropanol, add 58.1 g of phosphorous acid, 22.1 g of paraformaldehyde and 20 ml of concentrated hydrochloric acid, heat to 70 ° C, stir for 16 hours; cool to room temperature, filter, and distilled water The chitosan obtained by washing is neutral until the washing liquid, and the obtained chitosan is vacuum-dried at 35° C., with 1000ml isopropanol, 500ml 5% sodium hydroxide solution, 800ml deionized water, 500ml 5% hydrochloric acid solution, 1000ml of deionized water was washed sequentially until the pH of the washing liquid was 6; the resulting chitosan was added to a solution composed of 17.1 g of ferric chloride and 155 ml of water, stirred at 30°C for 8 hours, filtered, and washed with de...

Embodiment 2

[0069] 1. Preparation of Chitosan C

[0070] 1) Get 1000 grams of commercially available chitosan (molecular weight is 50KDa, deacetylation is 89%), repeatedly wash with 3750 milliliters of ethanol, filter, obtain chitosan A after drying;

[0071] 2) Add chitosan A to 6250 ml of ethanol, add 872 g of phosphorous acid, 319 g of paraformaldehyde and 265 ml of concentrated hydrochloric acid, heat to 70°C, stir for 24 hours; cool to room temperature, filter, and wash with distilled water to obtain The pH of the chitosan to the washing solution is 6.5, and the resulting chitosan is vacuum-dried at 40°C, and deionized with 6250ml ethanol, 3000ml 5% sodium hydroxide solution, 6000ml deionized water, 3000ml 5% hydrochloric acid solution, and 8000ml Wash with deionized water until the pH is 6; add the obtained chitosan to a solution composed of 257 grams of ferric chloride and 2315 milliliters of water, stir at 30°C for 12 hours, filter, and wash with deionized water until the washing li...

Embodiment 3

[0085] 1. Preparation of Chitosan C

[0086] 1) get 150 grams of commercially available chitosan (molecular weight is 80KDa, deacetylation is 89%), repeatedly washes with 900 milliliters of ethanols, filters, obtains chitosan A after drying;

[0087] 2) Add chitosan A to 940 ml of ethanol, add 109 g of phosphorous acid, 40 g of paraformaldehyde and 30 ml of concentrated hydrochloric acid, heat to 70°C, stir for 12 hours; after cooling to room temperature, filter and wash with distilled water The obtained chitosan is 7 to the pH of the washing solution, and the obtained chitosan is vacuum-dried at 30° C., with 1125ml ethanol, 600ml 5% sodium hydroxide solution, 1050ml deionized water, 600ml 5% hydrochloric acid solution, 1500ml Washing with deionized water successively until the pH of the washing liquid is 7; Gained chitosan is added to a solution composed of 32.1 grams of ferric chloride and 290 milliliters of water, stirred at 30°C for 10 hours, filtered, and washed with deio...

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PUM

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Abstract

The invention relates to chelation group-containing chitosan. The chelation group is crosslinked amino dithioformyl, ferric ion-loaded amino methylene phosphate and a heavy metal element. The invention also relates to a preparation method for the chelation group-containing chitosan. The chelate chitosan can remove a plurality of pesticide residues from agricultural and sideline products or food efficiently, quickly and conveniently, so that the agricultural and sideline products or the food can reach the national standard about the pesticide residues.

Description

technical field [0001] The invention relates to a chitosan, in particular to a chitosan containing a chelating group, a preparation method thereof and an application in removing pesticide residues. Background technique [0002] Pesticides are important means of production to ensure high yields in industries such as agriculture, forestry and animal husbandry. The large-scale promotion and use of pesticides has ensured the continuous increase in the output of agricultural, forestry and animal husbandry products, and has become an important means of improving human food supply; secondly, pesticides are also used to kill and control mosquitoes that endanger human and animal hygiene and health. , Flies, lice, fleas and peaks and other pests and germs, so that people and animals can live peacefully and stably, and grow up healthily. Therefore, the importance of pesticides to the modernization of a country is self-evident. [0003] However, the pesticide residues caused by the us...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08B37/08B01J45/00
Inventor 许峰高源
Owner BEIJING OKEANOS TECH
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