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Preparation method of porous carbon wave-absorbing material embedded with cobalt and oxide

A wave absorbing material, nanoporous carbon technology, applied in chemical instruments and methods, other chemical processes, etc., can solve the problems of high risk factor, increased dielectric loss and magnetic loss value, general wave absorbing performance, etc. The effect of uniform distribution, mild reaction conditions and simple process

Active Publication Date: 2020-11-17
UNIV OF SCI & TECH BEIJING +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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 increased, but the overall microwave absorption performance is average, and strong acid is used many times in the preparation process. Strong base, high risk factor

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] 1. Preparation of reaction solution:

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

[0036] Take V Methanol : V Deionized water To 7:1 as the solvent, prepare the solution in the following ratio.

[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 composite materials:

[0045] 1) The solution prepared by the above method was allowed to stand at 25°C for 24 hours, and a purple precipitate appeared at the bottom of the beaker;

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

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

Embodiment 2

[0051] 1. Preparation of reaction solution:

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

[0053] Take V Methanol : V Deionized water It is 7:1 as the solvent to prepare the solution in the following ratio.

[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 composite materials:

[0060] 1) The solution prepared by the above method was allowed to stand at 25°C for 24 hours, and a purple precipitate appeared at the bottom of the beaker;

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

[0062] 3) Disperse the purple powder in a magnetic boat for calcination. The magnetic boat is placed in a tube furnac...

Embodiment 3

[0066] 1. Preparation of reaction solution:

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

[0068] Take V Methanol : V Deionized water It is 7:1 as the solvent to prepare the solution in the following ratio.

[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 composite materials:

[0075] 1) The solution prepared by the above method was allowed to stand at 25°C for 24 hours, and a purple precipitate appeared at the bottom of the beaker;

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

[0077] 3) Disperse the purple powder in a magnetic boat, and place the magnetic boat in a tube furnace protected by argon at...

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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 with metal organic framework ZIF-67 as a template 3 O 4 Embedded nanoporous carbon absorbing material (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’s requirements for microwave absorbing materials have become higher and higher. They not only need to meet higher 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 band . The traditional classic method of preparing light-weight absorbing materials, such as the core-shell structure, using a thin shell film to improve the electromagnetic wave absorption performance of the material; the combination of lightweight carbon materials and magnetic materials can not only achieve the purpose of light weight At the same time, it ca...

Claims

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Application Information

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