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Magnetic cadmium ion-imprinted polymer and preparation method thereof

A technology for imprinting polymers and cadmium ions, which is applied in the field of food safety and can solve the problem of less imprinting of magnetic ions

Inactive Publication Date: 2016-08-24
SOUTH CHINA AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In recent years, there have been many reports on ion imprinting technology in China. However, the reports are mainly on Ni and Pb plasma, and there are few reports on magnetic ion imprinting, especially the magnetic ion imprinting polymer for cadmium ions.

Method used

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  • Magnetic cadmium ion-imprinted polymer and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0077] Example 1 Preparation method of magnetic cadmium ion imprinted polymer

[0078] The preparation method of magnetic cadmium ion imprinted polymer comprises the following steps:

[0079] S1. Preparation of Fe 3 o 4 Particles:

[0080] Weigh 0.02mol Fe 3 Cl 3 ·6H 2 O, 0.012mol FeCl 2 4H 2 O was placed in a 250ml Erlenmeyer flask, dissolved in 100ml of ultrapure water under nitrogen, heated and stirred in a constant temperature magnetic stirrer to 80°C, added 10ml of ammonia water and 2ml of PEG200, heated and stirred for 3h, the reaction was completed, cooled to room temperature, and After separating and removing the supernatant, wash with ethanol and ultrapure water three times each, dry in an oven at 60°C, and grind to obtain Fe 3 o 4 powder;

[0081] S2. Preparation of Fe 3 o 4 @SiO 2 :

[0082] Weigh 0.5g Fe 3 o 4 Disperse the powder into a mixed solution of 100ml distilled water, 50ml ethanol and 10ml ammonia water, then add 0.5ml TEOS dropwise, and st...

Embodiment 2

[0087] Example 2 Optimization of preparation process - selection of functional monomers (methacrylic acid and acrylamide)

[0088] 1. The preparation method is the same as in Example 1, except that the functional monomers used in step S4—methacrylic acid and acrylamide—are replaced by the following different combinations:

[0089] (1) Methacrylic acid;

[0090] (2) Vinylpyridine;

[0091] (3) Acrylamide;

[0092] (4) Methacrylic acid and vinylpyridine;

[0093] (5) Methacrylic acid and acrylamide;

[0094] (6) Acrylamide and vinylpyridine.

[0095] The functional monomers were screened by comparing the cadmium adsorption capacity of different combinations of functional monomers.

[0096] 2. The results are attached figure 1 As shown, in the preparation of magnetic cadmium ion-imprinted polymer (M-IIP), the adsorption capacity of ion-imprinted polymers prepared by bifunctional monomers was higher than that of ion-imprinted polymers prepared by single-functional monomers. ...

Embodiment 3

[0097] Example 3 Optimization of the preparation process - selection of the ratio of methacrylic acid and acrylamide

[0098] 1. The preparation method is the same as in Example 1, except that the ratios of the functional monomers used in step S4—methacrylic acid and acrylamide—are different: 1:1, 1:3, and 3:1, respectively.

[0099] 2. The results are attached figure 2 As shown, the adsorption capacity of cadmium is the highest when the ratio of methacrylic acid and acrylamide is 3:1.

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Abstract

The invention discloses a magnetic cadmium ion-imprinted polymer and a preparation method thereof. The magnetic cadmium ion-imprinted polymer is prepared by taking vinyl-modified Fe3O4@SiO2 as a magnetic carrier, Cd<2+> as a template, a combination of any two of methacrylic acid, acrylamide and vinyl pyridine as a functional monomer, ethylene glycol dimethacrylate (EGDMA) as a cross-linking agent, and azodiisobutyronitrile (AIBN) as an initiator. The magnetic cadmium ion-imprinted polymer is capable of carrying out enrichment and separation on trace cadmium in an agricultural product sample, and is high in detection sensitivity and accuracy; furthermore, the magnetic cadmium ion-imprinted polymer has the advantages of being simple in preparation method and low in cost and operation requirement, having higher selectivity for template ions, and the like; the product also can be rapidly separated in presence of an external magnetic field, so that the tedious operation such as centrifugation and filtration are avoided, and enrichment and separation efficiencies are improved; the magnetic cadmium ion-imprinted polymer has a wider and good application prospect in the field of detection of food and agricultural product samples.

Description

technical field [0001] The invention belongs to the technical field of food safety. More specifically, it relates to a magnetic cadmium ion imprinted polymer and a preparation method thereof. Background technique [0002] Cadmium is a highly toxic metal element. Cadmium pollution is highly accumulative and irreversible. It can enter the body through smoking and eating, and poses a great threat to human health. Therefore, the detection and treatment of cadmium pollution is of great significance. [0003] However, the content of cadmium in general agricultural product samples is very low, and the sample matrix is ​​complex, so it is difficult to detect trace cadmium directly. Separation, purification and enrichment. [0004] At present, the commonly used pretreatment methods for the analysis of metal ions at home and abroad include solid-phase extraction, liquid-liquid extraction, co-precipitation and ion exchange methods. These methods have their own advantages and disadv...

Claims

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Application Information

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IPC IPC(8): C08F292/00C08F220/06C08F220/56C08F222/14C08J9/26H01F1/42B01J20/26B01J20/28B01J20/30
CPCB01J20/06B01J20/103B01J20/261B01J20/28009B01J2220/4806B01J2220/4812C08F292/00H01F1/42C08F222/102
Inventor 徐小艳王梅吴青田兴国徐莉张燚黄樱
Owner SOUTH CHINA AGRI UNIV
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