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Preparation method and application of porous carbon-coated cobalt core-shell structure magnetic material

A technology of core-shell structure and magnetic materials, which is applied in the direction of material separation, analytical materials, chemical instruments and methods, etc., can solve the problems of high carbonization temperature and high requirements, and achieve low production cost, less raw material specification requirements, and simple preparation methods Effect

Active Publication Date: 2019-11-26
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the method is simple to operate and the process is controllable; and the carbon spheres can be applied to fields such as supercapacitors, protein separation, and removal of organic pollutants in water, the material has high requirements for raw materials, and Fe 3 o 4 Nanoclusters are magnetic cores; and a higher carbonization temperature is required

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Embodiment 1 A kind of preparation method of the core-shell structure magnetic material of porous carbon wrapping cobalt

[0028] The preparation method comprises the following steps:

[0029] (1) Disperse 0.5g of cobalt powder in 100mL of isopropanol, add 15mL of water and 10mL of ammonia water, stir evenly, add 5mL of tetraethyl orthosilicate dropwise, seal at room temperature for 8h; after the reaction is completed, wash with ethanol and water respectively , magnetically separated, and vacuum dried at 50°C for 8h to obtain Co@SiO 2 .

[0030] (2) 0.5g Co@SiO 2 Disperse in 50mL of acetonitrile, add 6.5mL of oleic acid, reflux at 50°C for 15h, and keep stirring; after the reaction is completed, wash with ethanol, dry at 80°C for 24h to obtain Co@SiO 2 @oleic acid.

[0031] (3) 0.5gCo@SiO 2 Add oleic acid to 1.0g n-hexane to make a magnetic fluid; add 0.5g sodium lauryl sulfate to 40mL water, stir well, mix with the made magnetic fluid, and ultrasonicate in an ice-...

Embodiment 2

[0033] Example 2 A preparation method of a porous carbon-wrapped cobalt core-shell magnetic material

[0034] The preparation method comprises the following steps:

[0035] (1) Disperse 1.0g of cobalt powder in 150mL of isopropanol, add 20mL of water and 15mL of ammonia water, stir evenly, add 10mL of tetraethyl orthosilicate dropwise, seal at room temperature for 12h; after the reaction is completed, wash with ethanol and water respectively , magnetically separated, and vacuum dried at 50°C for 8h to obtain Co@SiO 2 .

[0036] (2) 1.0g Co@SiO 2Disperse in 100mL of acetonitrile, add 13mL of oleic acid, reflux at 60°C for 12h, and keep stirring; after the reaction is completed, wash with ethanol, and dry at 90°C for 20h to obtain Co@SiO 2 @oleic acid.

[0037] (3) 1.0g Co@SiO 2 Add oleic acid to 1.5g n-hexane to make a magnetic fluid; add 1.0g sodium lauryl sulfate to 50mL water, stir evenly, mix with the prepared magnetic fluid, and ultrasonicate in an ice-water bath for ...

Embodiment 3

[0039] Example 3 A preparation method of a porous carbon-wrapped cobalt core-shell magnetic material

[0040] The preparation method comprises the following steps:

[0041] (1) Disperse 0.6g of cobalt powder in 150mL of isopropanol, add 18mL of water and 15mL of ammonia water, stir evenly, add 6mL of tetraethyl orthosilicate dropwise, seal at room temperature for 12h; after the reaction is completed, wash with ethanol and water respectively , magnetically separated, and vacuum dried at 50°C for 8h to obtain Co@SiO 2 .

[0042] (2) 0.6g Co@SiO 2 Disperse in 50mL of acetonitrile, add 8mL of oleic acid, reflux at 60°C for 12h, and keep stirring; after the reaction is completed, wash with ethanol, dry at 80°C for 24h to obtain Co@SiO 2 @oleic acid.

[0043] (3) 0.6g Co@SiO 2 Add oleic acid to 1.4g n-hexane to make a magnetic fluid; add 0.5g sodium lauryl sulfate to 45mL water, stir well, mix with the made magnetic fluid, and ultrasonicate in an ice-water bath for 15min; add 2...

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PUM

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Abstract

The invention belongs to the technical field of novel materials and applications thereof, and relates to a preparation method and an application of a porous carbon-coated cobalt core-shell structure magnetic material. The method comprises the following steps: coating the surface of magnetic cobalt with SiO2 by utilizing hydrolysis of tetraethoxysilane to obtain Co@SiO2; carrying out surface hydrophobicity and double bond modification by using oleic acid to obtain Co@SiO2@oleic acid; carrying out emulsion polymerization to achieve the polymerization of styrene on the surface of the magnetic core sphere to obtain a polymer microsphere with a magnetic core-shell structure; and carbonizing the polymer microsphere with the magnetic core-shell structure. The magnetic material with the core-shellstructure has a loose and porous surface, the mechanical strength and the chemical stability are further enhanced after carbonization, the carbonized magnetic material can be directly used for extracting and adsorbing endocrine disruptors, and the extraction recovery rate can reach 89.63-94.81%; and the magnetic material with the core-shell structure is combined with an HPLC technology to realizethe trace detection of endocrine disruptors, particularly bisphenol A.

Description

technical field [0001] The invention belongs to the technical field of new materials and applications, and relates to a preparation method and application of a core-shell magnetic material with porous carbon wrapped cobalt. Background technique [0002] Magnetic materials are widely used in the field of separation analysis due to their advantages of easy separation, convenience and quickness, and easy recovery. Since the magnetic solid-phase extraction technology was first proposed in 1999, it has developed into a sample pretreatment technology that has attracted much attention. Magnetic adsorbent materials play a very important role in the magnetic solid phase extraction process. In order to improve the extraction efficiency of analytes, the development of new magnetic adsorbents with high selectivity and high adsorption has become a research hotspot. [0003] Liu Liyi Fe 3 o 4 As a magnetic carrier, two functional magnetic solid-phase adsorption materials including mag...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20B01J20/28B01J20/30G01N30/02G01N30/06
CPCB01J20/20B01J20/103B01J20/02B01J20/28009B01J20/28021G01N30/02G01N30/06B01J2220/4812B01J2220/4806G01N2030/062
Inventor 于群祝仰文王丽娟郭兰磊潘斌林姜祖明严兰刘煜石静郭淑凤
Owner CHINA PETROLEUM & CHEM CORP
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