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Naphthyl polyimide magnetic composite and its preparation method and application

A naphthyl polyimide and naphthyl polyimide layer technology are applied in the field of naphthyl polyimide magnetic composite and its preparation, which can solve the problems of less research and the like, and achieve low preparation cost, reduced difficulty and high efficiency. Cost, effect of simple synthesis method

Active Publication Date: 2022-05-27
HENAN UNIV OF CHINESE MEDICINE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

So far, such compounds have been less studied in the field of sample pretreatment

Method used

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  • Naphthyl polyimide magnetic composite and its preparation method and application
  • Naphthyl polyimide magnetic composite and its preparation method and application
  • Naphthyl polyimide magnetic composite and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Example 1. Preparation of naphthyl polyimide magnetic composite

[0040] The preparation method of naphthyl polyimide magnetic composite comprises the following steps:

[0041] (1) Magnetic Fe 3 O 4 Synthesis of Nanoparticles:

[0042] Weigh 2.7g FeCl 3 ·6H 2 O solid in a 100mL beaker, add 80mL ethylene glycol, sonicate to FeCl 3 ·6H 2 O solid dissolved solution was a transparent liquid, then 7.2g anhydrous sodium acetate and 2.0g polyethylene glycol were added, ultrasonicated for 20min, the solution was yellow-brown, and contained a large amount of yellow flocs; the obtained mixture was transferred to the autoclave , reacted at 200 °C for 12 h, cooled to room temperature, and washed the Fe generated by the reaction with ethanol and double distilled water in turn. 3 O 4 Nanoparticles, repeated three times, Fe 3 O 4 Nanoparticles were stored in absolute ethanol for later use.

[0043] (2) Magnetic Fe 3 O 4 @SiO 2 Synthesis of Nanoparticles:

[0044] Weigh ...

Embodiment 2

[0054] Embodiment 2, the adsorption performance test of naphthyl polyimide magnetic composite:

[0055] 4 mg of naphthyl polyimide magnetic complex was taken, and 5 mL of Sudan red mixed standard solution with a concentration of 0.2 μg / mL was added to investigate the effect of ultrasonic time on the adsorption efficiency of Sudan red. like Image 6 As shown, the adsorption efficiency of the naphthyl polyimide magnetic composite of the present invention to the Sudan red compound increases with the extension of the adsorption time, and the adsorption efficiency reaches more than 90% at 8 min.

Embodiment 3

[0056] Embodiment 3. Comparison of naphthyl polyimide magnetic composite and commercial extraction material:

[0057] In order to investigate the extraction effect of naphthyl polyimide magnetic complex on Sudan red, six commercial extractants were selected, including neutral alumina, C18, NH 2 , MCX, HLB, and MAX, were compared. Weigh 3.0 mg of the above six extractants and add them to the Sudan red solution (0.2 μg / mL, 5.00 mL), and after adsorption for 10 min, pipette the extracted Sudan red solution for sample analysis, and calculate the adsorption efficiency. like Figure 7 As shown, the adsorption efficiency of the naphthyl polyimide magnetic composite for Sudan red is much higher than that of commercial adsorbents, indicating that it has unique advantages in the adsorption of Sudan dyes.

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Abstract

The invention discloses a naphthyl polyimide magnetic compound and its preparation method and application. The naphthyl polyimide magnetic compound includes magnetic Fe 3 o 4 The inner core and the SiO wrapped in turn outside the core 2 layer and a naphthyl polyimide layer, the naphthyl polyimide layer contains benzene rings, C=O, C-N, C-C and C=C bonds. In the present invention, the magnetic naphthyl polyimide polymer is bonded to the surface of magnetic nanoparticles through a covalent bond, and a composite material with multiple acting forces is prepared, and the naphthyl polyimide bonded to ferric oxide The amine material can not only provide the necessary specific surface area and pore structure as an extraction material, but also has a large number of conjugated benzene rings, which can have π‑π stacking and hydrophobic interactions with Sudan red molecules; the residual carboxyl groups can Hydrogen bonding occurs with the hydroxyl group in Sudan Red. The compound of the invention has large specific surface area, uniform pore size distribution, and can realize specific adsorption for some polar substances and substances with aromatic conjugated systems.

Description

technical field [0001] The invention relates to a separation material, in particular to a naphthalene-based polyimide magnetic compound and a preparation method and application thereof. Background technique [0002] Excessive use of additives in food, especially harmful dyes, may cause certain harm to human health. Sudan red is a lipophilic azobenzene compound, mainly including 4 types: I, II, III and IV. As a synthetic dye, it is widely used in the color enhancement of solvents, oils, waxes and gasoline, as well as shoes and floors. and so on. Due to its potential carcinogenicity, both China and the European Union have banned it as a food additive. However, Sudan Red is still illegally used by many businesses due to its low cost and good coloring properties. Reports of Sudan Red being detected in food frequently occur. It is necessary to establish a simple, fast and efficient method for the analysis and detection of Sudan red. [0003] At present, in order to analyze and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/26B01J20/28B01J20/30C02F1/28C02F101/38
CPCB01J20/265B01J20/28009B01J20/28007C02F1/285C02F2101/38
Inventor 胡锴崔永霞陈志红龚海燕
Owner HENAN UNIV OF CHINESE MEDICINE
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