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Walnut shell biomass c/mno 2 Preparation method of microwave absorbing material

A microwave absorbing material, walnut shell technology, applied in chemical instruments and methods, other chemical processes, etc., can solve the problems of low comprehensive utilization rate and complex structure, and achieve the improvement of electromagnetic wave absorption performance, magnetic permeability, and good promotion. The effect of applying value

Active Publication Date: 2022-03-25
LULIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the complex structure of lignocellulose and low comprehensive utilization rate, in order to improve its comprehensive utilization efficiency, it is one of the most effective ways to make it into biomass carbon materials

Method used

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  • Walnut shell biomass c/mno <sub>2</sub> Preparation method of microwave absorbing material
  • Walnut shell biomass c/mno <sub>2</sub> Preparation method of microwave absorbing material
  • Walnut shell biomass c/mno <sub>2</sub> Preparation method of microwave absorbing material

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Embodiment Construction

[0022] Specific embodiments of the present invention will be described in detail below.

[0023] A walnut shell biomass C / MnO 2 The preparation method of microwave absorbing material comprises the following steps:

[0024] (1) The walnut shell is dried, pulverized, and sieved into particles below 500 μm for use.

[0025] (2) Dissolve 6.94 g of potassium permanganate in 400 mL of aqueous solution, stir and dissolve fully, and form a solution for later use.

[0026] (3), add 1~10g (preferably 5g) of walnut shell powder prepared in step (1) to the potassium permanganate solution in step (2), stir and soak fully, filter and dry for about 0.5h, and obtain Walnut Shell Powder / KMnO 4 solid.

[0027] (4) Dissolve 10ml of ethylene glycol in 50ml of water to prepare a solution, mix the walnut shell powder / KMnO prepared in step (3) 4 The solid was added, ultrasonically dispersed for 0.5~2h, then filtered and dried to obtain walnut shell powder / MnO 2 solid.

[0028] (5), the walnut...

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Abstract

The invention discloses a walnut shell biomass C / MnO 2 The preparation method of the microwave absorbing material comprises: 1. walnut shells are dried, pulverized, and sieved for use; 2. potassium permanganate is dissolved in an aqueous solution, fully stirred to dissolve, and set aside; 3. walnut shell powder is added to permanganate Potassium solution, fully stirred and soaked, filtered and dried to obtain walnut shell powder / KMnO 4 Solid; 4. Dissolve ethylene glycol in water to prepare a solution, and walnut shell powder / KMnO 4 Add solids, ultrasonically disperse for 0.5~2h, and then filter and dry to obtain walnut shell powder / MnO 2 Solid; 5, the walnut shell powder / MnO 2 The solid is calcined under 800W microwave radiation for 10~30 seconds or at 500~800℃ for 1.5~5h, and then crushed to obtain walnut shell biomass C / MnO 2 Microwave absorbing material. The present invention is designed to introduce MnO in the walnut shell biomass carbon material 2 , improve the magnetic permeability of carbon materials, and enhance the absorbing performance.

Description

technical field [0001] The invention relates to the field of preparation of wave absorbing materials, in particular to a walnut shell biomass C / MnO 2 Preparation method of microwave absorbing material. Background technique [0002] With the continuous progress of modern science and technology, the application of microwave is also increasingly widespread, whether in the field of physics or chemistry. The ideal microwave absorbing material has the advantages of light weight, thinness, strong absorption, and wide absorption frequency band. According to the loss mechanism of absorbing materials to electromagnetic waves, absorbing materials can be divided into two types: magnetic loss absorbing materials and electrical loss absorbing materials. Magnetic loss absorbing materials include carbonyl iron, ferrite, ultrafine magnetic metal powder, TiO 2 , ZnO, SiC, etc., show the advantages of strong absorption and broadband, but are limited by their high density and poor high tempe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K3/00
CPCC09K3/00
Inventor 秦永其邓立强王毅郭晨杨卫民
Owner LULIANG UNIV