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Method for preparing organophosphorus insecticide nano silica gel surface molecular imprinted polymer

A technology of nano-silica gel and molecular imprinting, applied in alkali metal compounds, chemical instruments and methods, inorganic chemistry, etc., to achieve good molecular recognition performance

Inactive Publication Date: 2010-08-25
NANJING MEDICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Technical problem: In view of the deficiencies of the current detection methods for organophosphorus pesticide residues and the shortcomings of traditional molecularly imprinted polymers, the present invention provides three surface molecularly imprinted polymers with specific recognition properties for organophosphorus pesticides and their preparation method

Method used

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  • Method for preparing organophosphorus insecticide nano silica gel surface molecular imprinted polymer
  • Method for preparing organophosphorus insecticide nano silica gel surface molecular imprinted polymer
  • Method for preparing organophosphorus insecticide nano silica gel surface molecular imprinted polymer

Examples

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Effect test

Embodiment 1

[0024] Mix 50mL of absolute ethanol and 9mL of concentrated ammonia water to obtain solution A; then mix 5mL of TEOS and 30mL of absolute ethanol to obtain solution B; continuously drop solution B into a high-speed magnetic stirring tank at a rate of 15d / s at room temperature In solution A, the rotation speed was 700 rpm, and the stirring was continued for 24 hours after the dropwise addition; repeated ultrasonic washing with absolute ethanol until neutral, centrifuged, and vacuum drying at 60°C until constant weight. Obtain silica gel pellets of about 400nm.

[0025] The prepared SiO 2 Microspheres were placed in 50mL (10mol L -1 ) hydrochloric acid solution, acidified for 24 hours, washed repeatedly with ultrapure water to neutrality, centrifuged, placed in a vacuum oven, and dried to constant weight at 60°C; weighed the acidified SiO 2 Ultrasonic dispersion of 0.5 g of microspheres in a certain amount of toluene solution, adding 10 mL of γ-MPTS so that the volume concentr...

Embodiment 2

[0029] Mix 50mL of absolute ethanol and 9mL of concentrated ammonia water to obtain solution A; then mix 5mL of TEOS and 30mL of absolute ethanol to obtain solution B; continuously drop solution B into a high-speed magnetic stirring tank at a rate of 15d / s at room temperature In solution A, the rotation speed was 700 rpm, and the stirring was continued for 24 hours after the dropwise addition; repeated ultrasonic washing with absolute ethanol until neutral, centrifuged, and vacuum drying at 60°C until constant weight. Obtain silica gel pellets of about 400nm.

[0030] The prepared SiO 2 Microspheres were placed in 50mL (10mol L -1 ) hydrochloric acid solution, acidified for 24 hours, washed repeatedly with ultrapure water to neutrality, centrifuged, placed in a vacuum oven, and dried to constant weight at 60°C; then weighed the acidified SiO 2 Ultrasonic disperse 0.5g of microspheres in a certain amount of toluene solution, add 10mL of γ-APTS to make the volume concentration...

Embodiment 3

[0035] Mix 50mL of absolute ethanol and 9mL of concentrated ammonia water to obtain solution A; then mix 5mL of TEOS and 30mL of absolute ethanol to obtain solution B; continuously drop solution B into a high-speed magnetic stirring tank at a rate of 15d / s at room temperature In solution A, the rotation speed was 700 rpm, and the stirring was continued for 24 hours after the dropwise addition; repeated ultrasonic washing with absolute ethanol until neutral, centrifuged, and vacuum drying at 60°C until constant weight. Obtain silica gel pellets of about 400nm.

[0036] The prepared SiO 2 Microspheres were placed in 50mL (10mol L -1 ) hydrochloric acid solution, acidified for 24 hours, washed repeatedly with ultrapure water to neutrality, centrifuged, placed in a vacuum oven, and dried to constant weight at 60°C; then weighed the acidified SiO 2 Ultrasonic disperse 0.5g of microspheres in a certain amount of toluene solution, add 10mL of γ-APTS to make the volume concentration...

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Abstract

The invention relates to a method for preparing an organophosphorus insecticide nano silica gel surface molecular imprinted polymer. The method comprises the following steps of: preparing nano SiO2 microspheres; performing three different kinds of surface graft modification on the produced SiO2 microspheres; preparing pre-assembled solution; ultrasonically dispersing one of the modified SiO2 microspheres in a polymer solvent; adding a crosslinking agent, an initiator and the pre-assembled solution; performing centrifugation to remove supernatant after a reaction is finished; removing template molecules from the precipitate by using the mixed solution of methanol / acetic acid; putting the polymer microspheres with the template molecules removed in a vacuum drying box; and drying the polymer microspheres at the temperature of 60 DEG C to constant weight to obtain the molecular imprinted polymer microspheres. The three different molecular imprinted polymers prepared by the method have specificity identification to an organophosphorus insecticide (dursban) and can perform selective separation and enrichment on the residues of the organophosphorus insecticide.

Description

technical field [0001] The invention belongs to the technical field of molecularly imprinted polymers, in particular to a preparation method of molecularly imprinted polymers with specific recognition for organophosphorus pesticides. Background technique [0002] Organophosphorus pesticides are currently the largest category of pesticides in my country's pesticide market and are most widely used in agricultural activities. Theoretically, because it is easy to degrade in the environment and difficult to bioaccumulate, it is a new generation of pesticides that have little impact on ecological effects. In fact, organophosphorus pesticides have not only been detected in the Arctic region, but can even be transformed into some kind of persistent organic pollutants, causing harm to the environment. In addition, organophosphorus pesticides form phosphorylated cholinesterase with cholinesterase in the body, thereby inhibiting the production of acetylcholinesterase, and also produce...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/286B01J20/28B01J20/30
Inventor 都述虎陆庆彭艳陈雪梅谢颖罗晶聂力陈丹君陈丽娜胡琴
Owner NANJING MEDICAL UNIV
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