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Method for preparing MnO2@porous carbon composite wave absorbing material

A technology of composite microwave-absorbing materials and porous carbon, which is applied in the field of composite microwave-absorbing materials, can solve the problems of high cost, single microwave absorption response frequency band, and high equipment requirements, and achieve high cost, simple follow-up processing, and high equipment requirements.

Active Publication Date: 2021-03-16
NANCHANG HANGKONG UNIVERSITY
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0004]The problem to be solved by the present invention is: to provide a method for preparing MnO2@porous carbon composite wave-absorbing material, which can solve the existing Carbon-based microwave absorbing materials have the problems of high equipment requirements, high cost, and a single microwave absorption response frequency band.

Method used

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  • Method for preparing MnO2@porous carbon composite wave absorbing material
  • Method for preparing MnO2@porous carbon composite wave absorbing material
  • Method for preparing MnO2@porous carbon composite wave absorbing material

Examples

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Embodiment 1

[0028] Embodiment 1: a concrete implementation step of the present invention is as follows:

[0029] Step 1, the manganese chloride tetrahydrate of 3.3mmol, the 2,5-dihydroxyterephthalic acid of 1.0mmol are dissolved in the mixed solution of the DMF of 45mL, the deionized water of 3mL and the ethanol of 3mL together, then transfer to In an autoclave, heat preservation at 135°C for 24h, and the obtained product was centrifuged and washed three times with DMF; finally placed in a vacuum oven and dried under vacuum at 60°C to obtain Mn-MOF-74 rod-shaped crystals;

[0030] Step 2. The Mn-MOF-74 rod-shaped crystals prepared in step 1 were heated from room temperature to 700°C under the conditions of a nitrogen atmosphere and a heating rate of 2°C / min and calcined for 2h, and naturally cooled to room temperature under a nitrogen atmosphere to obtain MnO @NPC.

[0031] Step 3. Dissolve 0.1g of MnO@NPC prepared in step 2, 0.158g of potassium permanganate, and 5mL of 1.0M hydrochloric...

Embodiment 2

[0032] Example 2: The difference between this example and the specific example 1 is that in step 2, the Mn-MOF-74 rod-shaped crystals prepared in step 1 were heated from room temperature to 800 °C under a nitrogen atmosphere and a heating rate of 2 °C / min. ℃ and roasted for 2h, and naturally cooled to room temperature under a nitrogen atmosphere. Others are the same as in Example 1.

[0033] figure 1 For the X-ray diffraction pattern, the pyrolysis products of Mn-MOF-74 at 700 °C and 800 °C are labeled as MnO@NPC-700 and MnO@NPC-800, respectively. The oxidation products of MnO@NPC-700 and MnO@NPC-800 are labeled as MnO, respectively 2 @NPC-700 and MnO 2 @NPC-800. From figure 1It can be seen that MnO@NPC-700 and MnO@NPC-800 exhibit five distinct peaks at 34.9°, 40.5°, 58.7°, 70.2° and 73.8°, corresponding to the (111), (200), (220), (311) and (222) crystal planes. MnO 2 @NPC-700 and MnO 2 The XRD pattern of @NPC-800 is also similar, showing nine distinct peaks at 28.7°...

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Abstract

The invention discloses a method for preparing a MnO2@porous carbon (NPC) composite wave absorbing material, and relates to a method for preparing a composite wave absorbing material. In order to solve the technical problems of complex preparation method, high equipment requirement, high cost and single strongest absorption peak of the existing carbon-based microwave absorbing material, the invention provides a method for preparing a MnO2@NPC composite wave absorbing material by taking Mn-MOF-74 as a template. The preparation method comprises the following steps of: firstly, preparing a Mn-MOF-74 template; secondly, carrying out pyrolysis; and thirdly, carrying out in-situ redox. Compared with the problems of complex preparation method, high equipment requirement, high cost and single microwave absorption response frequency band of the existing carbon-based microwave absorption material, the preparation method disclosed by the invention has the advantages of simple process, low production cost, simplicity and convenience in subsequent treatment, no need of complex synthesis equipment and full-frequency-band microwave absorption response and is suitable for industrial large-scale production, popularization and application.

Description

technical field [0001] The invention relates to the technical field of combined wave-absorbing materials, in particular to a method for preparing MnO 2 @porous carbon composite absorbing material method. Background technique [0002] With the continuous development of electromagnetic wave technology, new wave-absorbing materials are gradually developing in the direction of light weight, thin thickness, broadband, and strong absorption. Absorbing materials have received widespread attention. The metal-organic framework compound Mn-MOF-74 has high thermal stability, and also has the advantages of large specific surface area, high porosity, and simple preparation process. It is suitable for mass production, and the carbon material obtained by using it as a precursor has better The graphitization properties of these materials possess the important conditions for the development of light microwave absorbing materials. [0003] MnO 2 Due to its natural abundance, low cost, and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G45/02C01B32/05H01Q17/00H05K9/00
CPCC01G45/02C01B32/05H05K9/0081H01Q17/00C01P2004/03C01P2004/80
Inventor 杨慧丽刘崇波刘倪杰
Owner NANCHANG HANGKONG UNIVERSITY
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