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Magnetic polyimide composite material, and preparation method and application thereof

A technology of polyimide and composite materials, applied in chemical instruments and methods, alkali metal compounds, other chemical processes, etc., can solve the problem of less application in the field of pretreatment, achieve a wide range of preparation methods, reduce difficulty and cost , the effect of uniform pore size distribution

Active Publication Date: 2019-01-15
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 rarely used in the field of sample pretreatment.

Method used

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  • Magnetic polyimide composite material, and preparation method and application thereof
  • Magnetic polyimide composite material, and preparation method and application thereof
  • Magnetic polyimide composite material, and preparation method and application thereof

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 Each 2mg of magnetic polyimide composite material, add 5mL rhodamine B standard solution (concentration is 1 μ g / mL) respectively, ultrasonic adsorption 5min, pass through microporous membrane, inject sample. Compare the adsorption capacity of the synthesized magnetic materials to rhodamine B compounds, such as Image 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 larger 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 Rhodamine ...

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Abstract

The invention discloses a magnetic polyimide composite material, and a preparation method and application thereof. The preparation method comprises the following steps: subjecting amino-modified Fe3O4, melamine and benzenetetracarboxylic dianhydride to a polymerization reaction in a DMSO solvent under a high-temperature reflux condition; and then carrying out washing and drying to obtain the magnetic polyimide composite material. The magnetic polyimide composite material synthesized by using the method has the advantages of good dispersibility, large specific surface area, stable core-shell structure, simple synthesis method, low cost, recyclability and the like. A covalent polyimide material bonded to ferroferric oxide can provide various forces such as pi-pi action, hydrophobic action, hydrogen bond action and weak cation exchange action, so the composite material has strong adsorption effect on compounds containing an aromatic conjugated system and alkaline compounds.

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 may cause allergies and asthma, breathing problems, chromosomal damage, and abdominal pain. Rhodamine B is considered a strictly prohibited additive in many countries. However, the 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 nec...

Claims

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Application Information

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Patent Type & Authority Applications(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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