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Magnetic heteroporous covalent nano material and preparation method and application thereof

A technology of nanomaterials and magnetic nanoparticles, which is applied in the field of magnetic heteroporous covalent nanomaterials and its preparation, can solve the problems of time-consuming and cumbersome operations, and achieve the effects of simplifying the operation process, improving adsorption efficiency, and saving separation time

Inactive Publication Date: 2019-12-17
NANKAI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] At present, the QuEChERS technology developed specifically for the rapid screening and analysis of pesticide residues in a large number of food and agricultural product samples is more and more popular, but the operation is cumbersome and time-consuming. In view of the above points, there is an urgent need for a method that can efficiently remove and Selectively purify the adsorbent of chlorophyll, lutein, carotene and other pigment interference substances in the matrix of food samples, and does not adsorb pesticide residues, so as to obtain a clean upper solution, reduce the interference of the matrix on the determination target, and have a good effect on pesticide residues The content can be accurately qualitative and quantitative analysis

Method used

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  • Magnetic heteroporous covalent nano material and preparation method and application thereof
  • Magnetic heteroporous covalent nano material and preparation method and application thereof
  • Magnetic heteroporous covalent nano material and preparation method and application thereof

Examples

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Embodiment 1

[0046] 1. Synthesis method of magnetic heteroporous covalent nanomaterials:

[0047] (1) Synthesis of magnetic nanoparticles by solvothermal method;

[0048] S11, 1.35g ferric trichloride hexahydrate (FeCl 3 ·6H 2 O) and 3.6g anhydrous sodium acetate (CH 3 COONa) was dissolved in 40mL of ethylene glycol and stirred to form mixture a;

[0049] S12. Dissolving 1.5 g of polyethylene glycol as a surfactant substance in 40 mL of ethylene glycol and heating at 70° C. for 5 minutes to form solution b;

[0050] S13. Slowly pour solution b into mixture a and stir for 30 minutes, then transfer to a high-pressure reactor and react at 200°C for 10 hours. After the reactor is cooled to room temperature, wash with ethanol and high-purity water alternately for 5 times, and vacuum-dry at 60°C. After 3 hours, the solid magnetic nanoparticles (Fe 3 o 4 ).

[0051] (2) Composite magnetic nanoparticles (Fe 3 o 4 @SiO 2 -NH 2 ) synthesis: a layer of SiO was modified on the surface of ma...

experiment example 1

[0065] Experimental Example 1: Transmission Electron Microscopy Analysis

[0066] Adopt model to be TF20, the transmission electron microscope of Jeol 2100F analyzes the magnetic heteroporous covalent nanomaterial prepared by the embodiment of the present invention 1, the results are shown in image 3 , it can be seen that the material prepared by the present invention has a core-shell structure, and the covalent organic framework covered by the outer layer has a regular hexagonal structure with two different pore sizes, and the particle size range is 500-700nm. image 3 (A) is the magnetic nanoparticles (Fe 3 o 4 ) morphology and structure diagram, the particle size range is 100-250nm, image 3 (B) is the magnetic composite material (Fe 3 o 4 @SiO 2 -NH 2 ) morphology and structure diagram, the particle size range is 160-280nm, image 3 (C) is the magnetic heteroporous covalent nanomaterial (Fe 3 o 4 @SiO 2 -NH 2 @COFs) with a particle size range of 500-700nm.

experiment example 2

[0067] Experimental Example 2: Infrared Spectral Analysis

[0068] refer to image 3 Taking the magnetic heteroporous covalent nanomaterial prepared in Example 1 of the present invention as an example for illustration, from image 3 It can be seen from the figure that the magnetic heteroporous covalent nanomaterial prepared by the method of the present invention has a circular core-shell structure, uniform particle size, good dispersion and obvious coating layer.

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Abstract

The invention provides a magnetic heteroporous covalent nano material and a preparation method and application thereof. The magnetic heteroporous covalent nano material is prepared by synthesizing a silicon-coated magnetic composite material by hydrolysis polymerization reaction on the surface of magnetic nano particles through a silanization reagent, and performing amino bonding reaction on the magnetic composite material and a covalent organic framework. The magnetic heteroporous covalent nano material is a circular core-shell structure, and the covalent organic framework bonded on the outerlayer of the core-shell structure is a hexagonal structure. The magnetic heteroporous covalent nano material has two pore sizes and has good adsorption capacity for pigment molecules in food and agricultural products. The detection and analysis of pesticide residue content in food and agricultural products samples can be carried out by combining liquid chromatography or mass spectrometry analysistechnology, thus realizing full recovery of chemical hazard factors.

Description

technical field [0001] The patent of the invention relates to the field of synthesis of nanomaterials, specifically a magnetic heteroporous covalent nanomaterial and its preparation method and its application to the adsorption of pigment molecules in the pretreatment of food and agricultural products. Background technique [0002] Food safety is a major issue related to human health. The World Health Organization (WHO) interprets food safety in its "Guidelines for Strengthening National Food Safety Plans" as "the safety of food when it is prepared and eaten according to its original purpose. It is a guarantee that consumers will be harmed”, and at present, various excessive pesticide and veterinary drug residues, food additives, endocrine disruptors, etc. in food and agricultural products may cause huge harm to human health. [0003] At present, there are many difficulties in the detection of food samples. Due to the wide variety of chemical hazard factors, strong heterogene...

Claims

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Application Information

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IPC IPC(8): B01J20/22B01J20/28G01N30/02G01N30/06B01J20/30
CPCB01J20/041B01J20/06B01J20/226B01J20/28009G01N30/02G01N30/06
Inventor 孔德明李薇唐安娜王晓涵
Owner NANKAI UNIV
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