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A kind of magnetic polyimide composite material and its preparation method and application

A polyimide and composite material technology, applied in chemical instruments and methods, other chemical processes, alkali metal compounds, etc., can solve the problems of less application in the field of pretreatment, achieve low cost, good dispersion, reduce difficulty and cost effect

Active Publication Date: 2021-06-01
HENAN UNIV OF CHINESE MEDICINE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among various POPs, porous polyimide is widely used in separation, coating, aviation, microelectronics and optoelectronics industries due to its unique properties, but it is less used in sample pretreatment.

Method used

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  • A kind of magnetic polyimide composite material and its preparation method and application
  • A kind of magnetic polyimide composite material and its preparation method and application
  • A kind of magnetic polyimide composite material and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Embodiment 1, the preparation of magnetic polyimide composite material

[0038] A preparation method of magnetic polyimide composite material, comprising the following steps:

[0039] (1) Magnetic Fe 3 o 4 Synthesis of nanoparticles:

[0040] Weigh 1.2g FeCl 3 ·6H 2 O solid in a 100mL beaker, add 30mL of ethylene glycol, sonicate to dissolve it into a transparent solution, then add 3.5g of anhydrous sodium acetate and 0.8g of polyethylene glycol, sonicate for 15min; transfer to a 200mL high-pressure reaction In the kettle, react at 200°C for 15 hours, and wash the Fe produced by the reaction with ethanol and ultrapure water in sequence. 3 o 4 , repeated three times, after vacuum drying at 60°C for 12 hours, magnetic Fe with good monodispersity can be obtained 3 o 4 Nanoparticles, stored in a desiccator for subsequent use;

[0041] (2) Magnetic Fe 3 o 4 @SiO 2 Synthesis of particles:

[0042] Weigh 1.0g Fe 3 o 4 In a 250mL three-necked round-bottomed flask...

Embodiment 2

[0052] Embodiment 2, the adsorption performance test of polyimide composite material:

[0053] 1. Adsorption of rhodamine B compounds

[0054] The specific method is:

[0055] Take Fe 3 o 4 @SiO 2 , Fe 3 o 4 @SiO 2 -NH 2 1. Each 2 mg of magnetic polyimide composite material was added to 5 mL of rhodamine B standard solution (concentration: 1 μg / mL), ultrasonically adsorbed for 5 min, passed through a microporous membrane, and injected. Compare the adsorption capacity of each synthesized magnetic material to rhodamine B compound, such as Figure 6 shown. Experiments have shown that the magnetic polyimide composite material has the best adsorption capacity for rhodamine B. This is because the modified polyimide layer not only has a large specific surface area and unique pore size, but also can provide multiple interactions such as π-π, hydrophobicity, hydrogen bonding, and weak cation exchange.

[0056] Take 2 mg of magnetic polyimide composite material, add 5 mL of R...

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Abstract

The invention discloses a magnetic polyimide composite material and its preparation method and application. The preparation method is to prepare amino-modified Fe in DMSO solvent 3 o 4 , Melamine and pyromellitic dianhydride are polymerized under high-temperature reflux, and the magnetic polyimide composite material can be obtained after washing and drying. The magnetic polyimide composite material synthesized by the method has the advantages of good dispersibility, large specific surface area, stable core-shell structure, simple and convenient synthesis method, low cost, repeatable recycling and the like. The covalent polyimide material bonded to ferric oxide can provide various forces such as π-π interaction, hydrophobic interaction, hydrogen bond interaction, weak cation exchange interaction, etc., so the material is suitable for some aromatic conjugated systems , Basic compounds have a strong adsorption.

Description

technical field [0001] The invention relates to a separation material, in particular to a magnetic polyimide composite material and its preparation method and application. Background technique [0002] Excessive use of additives in food, especially harmful dyes, may cause certain harm to human health. Rhodamine B (RhB) is a water-soluble dye that has been synthesized and widely used in fluorescent labeling, food coloring, and the fireworks, textile, cosmetic, and colored glass industries. In addition, rhodamine B is often added to food as a pigment. When taken orally or absorbed through the skin, even trace amounts can cause allergies and asthma, breathing problems, chromosomal damage, and abdominal pain. Rhodamine B is considered a strictly prohibited additive in many countries. However, illegal use of banned rhodamine B in food products remains an ongoing problem due to its low cost and bright colors, which can endanger the health of consumers. Therefore, it is necessa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/28B01J20/26B01J20/30C02F1/28C02F101/34C02F101/38
CPCB01J20/06B01J20/262B01J20/28009C02F1/28C02F1/281C02F1/285C02F2101/34C02F2101/38
Inventor 胡锴程佳敏崔永霞陈志红董春红
Owner HENAN UNIV OF CHINESE MEDICINE
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