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Ferroferric oxide/biomass porous carbon composite wave-absorbing material and preparation method thereof

A composite wave-absorbing material, the technology of ferroferric oxide, which is applied in the field of wave-absorbing materials, can solve problems such as easy agglomeration, poor temperature adaptability, and poor low-frequency absorption performance, and achieve the effect of solving agglomeration, strong adsorption capacity, and good stability

Pending Publication Date: 2021-09-24
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] In order to overcome the above-mentioned shortcoming of the prior art, the object of the present invention is to provide a kind of ferric oxide / biomass porous carbon (Fe 3 o 4 / BPC) composite wave-absorbing material and its preparation method, which solve the inherent defects of existing materials such as easy agglomeration, poor temperature adaptability, and poor low-frequency absorption performance

Method used

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  • Ferroferric oxide/biomass porous carbon composite wave-absorbing material and preparation method thereof
  • Ferroferric oxide/biomass porous carbon composite wave-absorbing material and preparation method thereof
  • Ferroferric oxide/biomass porous carbon composite wave-absorbing material and preparation method thereof

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preparation example Construction

[0028] The present invention adopts the direct carbonization method to prepare the embedded Fe 3 o 4 Biomass carbon magnetic wave-absorbing material of magnetic particles, that is, ferric oxide / biomass porous carbon (Fe 3 o 4 / BPC) (BPC, biomass porous carbon) composite absorbing material. The Fe 3 o 4 The preparation method of the / BPC composite wave-absorbing material specifically includes the following steps:

[0029] (1) Clean the biomass carbon source ultrasonically in ethanol, and dry it in an oven after cleaning.

[0030] (2) Dip the dried biomass carbon source into ferric nitrate / ferric sulfate / ferric chloride / ferric acetate solution, and put it in an oven for a period of time to fully absorb iron ions.

[0031] (3) Take out the soaked biomass carbon source, ultrasonically clean it, and dry it in an oven.

[0032] (4) The soaked and dried biomass carbon source is used as a precursor under vacuum and calcined in a horizontal vacuum tube furnace to obtain a compos...

Embodiment 1

[0041] (1) The dried fungus was ultrasonically cleaned in ethanol for 1 hour, and dried in an oven at 60°C for 2 hours.

[0042] (2) Immerse 10 g of fungus into a beaker filled with 100 mL of 0.2 mol / L ferric nitrate solution, seal the beaker with plastic wrap and put it in an oven at 60°C for 6 hours to fully absorb iron ions.

[0043] (3) Take out the soaked fungus, ultrasonically clean it for 30 minutes, and dry it in an oven at 60° C. for 36 hours.

[0044] (4) The soaked and dried fungus was used as a precursor to be calcined under vacuum at a heating rate of 5 °C / min to 400 °C for 2 h to obtain a composite material of ferroferric oxide and biomass porous carbon (Fe 3 o 4 / BPC), which is Fe 3 o 4 / BPC composite absorbing material.

Embodiment 2

[0046] (1) The dried fungus was ultrasonically cleaned in ethanol for 1 hour, and dried in an oven at 60°C for 2 hours.

[0047] (2) Immerse 10 g of fungus into a beaker filled with 100 mL of 2 mol / L ferric nitrate solution, seal the beaker with plastic wrap and put it in an oven at 60°C for 6 hours to fully absorb iron ions.

[0048] (3) Take out the soaked fungus, ultrasonically clean it for 30 minutes, and dry it in an oven at 60° C. for 36 hours.

[0049] (4) The soaked and dried fungus was used as a precursor to be calcined under vacuum at a heating rate of 5 °C / min to 600 °C for 2 h to obtain a composite material of ferroferric oxide and biomass porous carbon (Fe 3 o 4 / BPC), which is Fe 3 o 4 / BPC composite absorbing material.

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Abstract

The invention discloses a ferroferric oxide / biomass porous carbon composite wave-absorbing material and a preparation method thereof, and belongs to the field of wave-absorbing materials. The preparation method comprises the steps of cleaning and drying a biomass carbon source, and soaking the dried biomass carbon source in an iron source solution to absorb iron ions; and cleaning the soaked biomass carbon source, drying, and calcining to obtain the ferroferric oxide / biomass porous carbon composite wave-absorbing material. According to the invention, the inherent defects of easy agglomeration, poor temperature adaptability and poor low-frequency absorption performance of the existing material are effectively solved. The ferroferric oxide / biomass porous carbon composite wave-absorbing material prepared by the method is low in density, the agglomeration phenomenon is reduced, and the wave-absorbing performance is remarkably improved.

Description

technical field [0001] The invention belongs to the field of wave-absorbing materials, and relates to a composite wave-absorbing material of ferric oxide / biomass porous carbon and a preparation method thereof. Background technique [0002] As an important absorber of electromagnetic waves, ferrite material is a double-composite dielectric material, which has both magnetic and dielectric properties, so it has good wave-absorbing characteristics, low cost, and small size. Wave material, in terms of impedance matching, it not only has magnetic absorption but also electric absorption for electromagnetic waves; in terms of attenuation matching, magnetic loss and electrical loss are also the sources of electromagnetic wave loss, and the combination of the two can make electromagnetic waves obtain maximum absorption and loss. Ferrite materials also inevitably have disadvantages, such as high density, narrow absorption frequency band, and poor high temperature resistance. [0003]...

Claims

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Application Information

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IPC IPC(8): C09K3/00C01G49/08C01B32/05
CPCC09K3/00C01G49/08C01B32/05C01P2002/72C01P2004/03C01P2004/61
Inventor 苏进步杨锐王成兵王维科赵霞霖金日成许珂圆卫丹
Owner SHAANXI UNIV OF SCI & TECH
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