Preparation method of biomass porous carbon electromagnetic wave-absorbing material taking egg white as precursor

An electromagnetic wave absorption and precursor technology, which is applied in the preparation/purification of carbon, chemical instruments and methods, and other chemical processes, etc. The effect of improving surface area, light density, and electromagnetic wave absorption performance

Active Publication Date: 2019-11-22
HARBIN INST OF TECH
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  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to provide a method for preparing a biomass porous carbon electromagnetic absorbing material using egg white as a precursor in order to solve the problems of high density and low specific absorbing strength of existing electromagnetic absorbing materials. The assembly method realizes the in-situ doping of heteroelements from bottom to top, realizes the design of porous carbon materials and structures, broadens the carbon source selection of porous carbon materials, and achieves good electromagnetic properties

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  • Preparation method of biomass porous carbon electromagnetic wave-absorbing material taking egg white as precursor
  • Preparation method of biomass porous carbon electromagnetic wave-absorbing material taking egg white as precursor
  • Preparation method of biomass porous carbon electromagnetic wave-absorbing material taking egg white as precursor

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specific Embodiment approach 1

[0030] Specific implementation mode 1: This implementation mode records a preparation method of a biomass porous carbon electromagnetic absorbing material with egg white as a precursor, using egg white and potassium carbonate as raw materials, and preparing by heating through the principle of thermal denaturation of protein Obtain the precursor, and further high-temperature carbonization under an argon atmosphere to obtain nitrogen-doped porous carbon; the method steps are as follows:

[0031] Step 1: Pretreatment of egg whites: Pretreatment of egg whites by means of physical dispersion to obtain a uniform protein solution;

[0032] Step 2: Preparation of precursor solution: Add or not add potassium carbonate solution to the protein solution obtained in step 1. If adding, add dropwise while stirring to form a uniform solution, titrate with deionized water, and use an ultrasonic cell pulverizer to crush the liquid Perform ultrasonic pulverization to obtain a uniform precursor s...

specific Embodiment approach 2

[0036] Specific embodiment two: the preparation method of a kind of biomass porous carbon electromagnetic wave-absorbing material with egg white as the precursor described in specific embodiment one, in step one, fresh egg white is separated from the egg, and ultrasonic cell The pulverizer is used for ultrasonic pulverization to obtain a uniform protein (as the main component) solution.

specific Embodiment approach 3

[0037] Specific embodiment three: a kind of preparation method of the biomass porous carbon electromagnetic wave-absorbing material that takes egg white as the precursor described in specific embodiment two, the mass fraction of protein in the described protein solution is 10 ± 5wt% (different The mass fraction of protein in the protein solution obtained from eggs will vary).

[0038] Embodiment 4: A method for preparing a biomass porous carbon electromagnetic wave-absorbing material that uses egg white as a precursor according to Embodiment 2, the power of the ultrasonic pulverization is 5% to 15% of the power of the ultrasonic cell pulverizer , the time is 1 to 2 minutes.

[0039] Specific embodiment five: a kind of preparation method of the biomass porous carbon electromagnetic wave-absorbing material that takes egg white as the precursor described in specific embodiment one, in step two, the mass concentration of described potassium carbonate solution is 25wt%; The mass r...

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Abstract

The invention discloses a preparation method of a biomass porous carbon electromagnetic wave-absorbing material taking egg white as a precursor, and belongs to the technical field of electromagnetic wave-absorbing material preparation. The method comprises the following steps: pretreating egg white to obtain a uniform protein solution; adding a potassium carbonate solution into the protein solution to form a uniform solution, titrating, and carrying out ultrasonic crushing to obtain a precursor solution; heating the precursor solution in a water bath to obtain a porous carbon precursor; freezing the precursor with liquid nitrogen, and freeze-drying the precursor to obtain a dried porous carbon precursor; and heating and carbonizing the dried porous carbon precursor in an argon atmosphere.Selection of carbon source materials of the porous carbon is broadened, and compared with other carbon source materials, the selected carbon source belongs to renewable biomass and is low in cost. Theporous carbon material has a large specific surface area, and has a large number of active scattering sites due to introduction of nitrogen, so that the porous carbon material has good electromagnetic wave-absorbing performance.

Description

technical field [0001] The invention belongs to the technical field of preparation of electromagnetic wave-absorbing materials, and in particular relates to a method for preparing a biomass porous carbon electromagnetic wave-absorbing material with egg white as a precursor. Background technique [0002] With the continuous development of military (mainly used in the electromagnetic stealth of fighter planes, etc.) and civilian (to reduce electromagnetic radiation due to the consideration of human health), electromagnetic absorbing materials have become a hot research topic. [0003] Traditional electromagnetic absorbing materials are mainly ferromagnetic metal elements and their oxides. Although this type of absorbing material has good absorption performance, due to the high density of metal elements, the specific absorbing capacity of the material is not high. very high. The new electromagnetic absorbing materials represented by porous carbon solve the problems of poor mec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/05C09K3/00
CPCC01B32/05C09K3/00
Inventor 刘宗林彭庆宇赫晓东
Owner HARBIN INST OF TECH
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