Preparation method of cobalt and oxide embedded porous carbon absorbing material

A wave-absorbing material and oxide technology, applied in chemical instruments and methods, and other chemical processes, can solve problems such as high risk factor, increase in dielectric loss and magnetic loss, general wave-absorbing performance, etc., and achieve particle size distribution Uniformity, mild reaction conditions, and simple process

Active Publication Date: 2019-01-11
UNIV OF SCI & TECH BEIJING +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Compared with the uncoated sample, the dielectric loss and magnetic loss values ​​of the porous carbon fiber sample coated with ferroferric oxide are indeed incr

Method used

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  • Preparation method of cobalt and oxide embedded porous carbon absorbing material
  • Preparation method of cobalt and oxide embedded porous carbon absorbing material
  • Preparation method of cobalt and oxide embedded porous carbon absorbing material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] 1. Preparation of the reaction solution:

[0035] 1) Preparation of ZIF-67 precursor reaction solution:

[0036] with V 甲醇 :V 去离子水 Prepare a solution in the following proportions for 7:1 as solvent.

[0037] CoCl 2 ·6H 2 O-------------------0.04mol / L

[0038] PVP K30------------------------0.8g / L

[0039] (metal salt solution)

[0040] 2-Methylimidazole ------------------0.6mol / L

[0041] (organic ligand solution)

[0042] Temperature ----------------------------- 25℃

[0043] Stirring time ------------------------20min

[0044] 2. Co / Co 3 o 4 Preparation of embedded nanoporous carbon composites:

[0045] 1) Put the solution prepared by the above method at 25°C for 24 hours, and a purple precipitate appears at the bottom of the beaker;

[0046] 2) Centrifuge the solution, wash the ZIF-67 powder 3 times with ethanol, dry it in a vacuum oven at 60°C for 12 hours, and collect it;

[0047] 3) Disperse the purple powder in a magnetic boat for calcination. The ...

Embodiment 2

[0051] 1. Preparation of the reaction solution:

[0052] 1) Preparation of ZIF-67 precursor reaction solution:

[0053] with V 甲醇 :V 去离子水 Prepare a solution in the following proportions for 7:1 as solvent.

[0054] CoCl 2 ·6H 2 O-------------------0.12mol / L

[0055] PVP K30------------------------12g / L

[0056] 2-Methylimidazole------------------1.2mol / L

[0057] Temperature ----------------------------- 25℃

[0058] Stirring time ------------------------20min

[0059] 2. Co / Co 3 o 4 Preparation of embedded nanoporous carbon composites:

[0060] 1) Put the solution prepared by the above method at 25°C for 24 hours, and a purple precipitate appears at the bottom of the beaker;

[0061] 2) Centrifuge the solution, wash the ZIF-67 powder 3 times with ethanol, dry it in a vacuum oven at 60°C for 18 hours, and collect it;

[0062] 3) Disperse the purple powder in a magnetic boat for calcination. The magnetic boat is placed in an argon-protected tube furnace with a heat...

Embodiment 3

[0066] 1. Preparation of the reaction solution:

[0067] 1) Preparation of ZIF-67 precursor reaction solution:

[0068] with V 甲醇 :V 去离子水 Prepare a solution in the following proportions for 7:1 as solvent.

[0069] CoCl 2 ·6H 2 O-------------------0.40mol / L

[0070] PVP K15------------------------40g / L

[0071] 2-Methylimidazole------------------1.8mol / L

[0072] Temperature ----------------------------- 25℃

[0073] Stirring time ------------------------20min

[0074] 2. Co / Co 3 o 4 Preparation of embedded nanoporous carbon composites:

[0075] 1) Put the solution prepared by the above method at 25°C for 24 hours, and a purple precipitate appears at the bottom of the beaker;

[0076] 2) Centrifuge the solution, wash the ZIF-67 powder 3 times with ethanol, dry in a vacuum oven at 60°C for 24 hours, and then collect;

[0077] 3) Disperse the purple powder in a magnetic boat, place the magnetic boat in an argon-protected tube furnace, heat up at a rate of 5°C / min, and...

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Abstract

The invention relates to a preparation method of a cobalt and oxide embedded porous carbon absorbing material, which belongs to the technical field of a microwave absorption material. The method adopts a metal organic skeleton ZIF-67 as a precursor, and obtains the preparation method of the nanoporous carbon composite absorbing material embedded with Co/Co3O4 by one-step carbonization. The metal organic skeleton ZIF-67 powder is synthesized by a diffusion method and a coprecipitation method, and the ZIF-67 powder is calcined under inert atmosphere of 500-800 DEG C, after the temperature is lowered to a certain temperature, the powder is taken out and air cooled, Co is oxidized to Co3O4, after being completely cooled, the powder is ground, and the black powder is collected to obtain the Co/Co3O4 embedded nanoporous carbon composite absorbing material with excellent absorbing properties. The process not only has a simple process, but also has low raw material cost, short time-consuming period, no need for any subsequent processing technology and no complicated synthesis equipment, and provides conditions for practical production applications.

Description

technical field [0001] The invention relates to a method for preparing Co / Co by using metal-organic framework ZIF-67 as a template 3 o 4 Embedded nanoporous carbon absorbers (Co / Co 3 o 4 The preparation method of @NPC) belongs to the technical field of microwave absorbing materials. Background technique [0002] In recent years, people have higher and higher requirements for microwave absorbing materials, which not only need to meet the needs of high absorption strength but also meet the needs of practical applications, that is, materials are required to have lower density, thinner matching thickness and wider absorption frequency band . The traditional classic method of preparing lightweight absorbing materials, such as core-shell structure, uses a thin shell film to improve the electromagnetic wave absorption performance of the material; the composite of lightweight carbon materials and magnetic materials can not only achieve the purpose of light weight At the same ti...

Claims

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Application Information

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IPC IPC(8): C09K3/00
CPCC09K3/00
Inventor 俞宏英孙冬柏贾红媛
Owner UNIV OF SCI & TECH BEIJING
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