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Method for preparing Fe/Co/C composite wave-absorbing material on the basis of pyrolysis of modified MOF material

A composite wave-absorbing material and modification technology, applied in chemical instruments and methods, other chemical processes, etc., can solve the problem of less wave-absorbing composite materials and achieve excellent wave-absorbing performance

Active Publication Date: 2019-01-18
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In recent years, reports on the application of MOF materials are more concentrated in the fields of hydrogen storage, catalysis, and sensing, but there are fewer reports on MOF-based microwave-absorbing composite materials.

Method used

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  • Method for preparing Fe/Co/C composite wave-absorbing material on the basis of pyrolysis of modified MOF material
  • Method for preparing Fe/Co/C composite wave-absorbing material on the basis of pyrolysis of modified MOF material
  • Method for preparing Fe/Co/C composite wave-absorbing material on the basis of pyrolysis of modified MOF material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Step 1, weigh 0.675gFeCl 3 ·6H 2 O. 0.206g of terephthalic acid and 0.0821g of 2-methylimidazole were dissolved in 15mL of N,N-dimethylformamide solution, and dispersed by ultrasonic to obtain a homogeneous solution. Pipette this solution into a 100ml hydrothermal reaction kettle lined with Teflon, seal it and put it into an electric constant temperature blast drying oven to prepare the reaction in a temperature control mode. The hydrothermal temperature is controlled at 110°C. The time is controlled at 20h, and the reaction is naturally cooled after the end. Open the hydrothermal kettle at room temperature, remove the obtained orange-yellow turbid liquid and collect the orange-yellow solid by centrifugation in a high-speed centrifuge. After that, wash the solid twice with 60°C hot ethanol, and use a collector type constant temperature heating magnetic stirring for each washing The mixture was stirred for 3 hours, collected by centrifugation while it was hot, and drie...

Embodiment 2

[0033] This example is basically the same as Example 1, except that 0.2053 g of 2-methylimidazole is added in step 1.

[0034]The obtained MOF precursor is marked as MOF(2); the final product Fe / Co / C composite absorbing material is marked as Fe / Co / C(2)-700.

Embodiment 3

[0036] This embodiment is basically the same as embodiment 1, the only difference is that 0.3284g of 2-methylimidazole is added in step 1.

[0037] The obtained MOF precursor is marked as MOF(3); the final product Fe / Co / C composite absorbing material is marked as Fe / Co / C(3)-700.

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Abstract

The invention discloses a method for preparing a Fe / Co / C composite wave-absorbing material on the basis of pyrolysis of a modified MOF material. The method for preparing the Fe / Co / C composite wave-absorbing material on the basis of pyrolysis of the modified MOF material comprises the steps of using metal salts and organic ligands as raw materials, and adding a modifying agent to prepare an organicmetal frame structure precursor with a controllable structure; mixing and grinding the organic metal frame structure precursor with the controllable structure together with a solution containing specific metal ions; and finally, converting an MOF material mixed with specific metal ions into two-magnetic-metal and porous carbon composite material, namely, the Fe / Co / C composite wave-absorbing material, via high-temperature calcination under inert gas protection. The Fe / Co / C composite wave-absorbing material prepared with the method for preparing the Fe / Co / C composite wave-absorbing material onthe basis of pyrolysis of the modified MOF material, disclosed by the invention, possesses dielectric loss performance and magnetic loss performance; when the matching thickness is 3 mm, the Fe / Co / C composite wave-absorbing material reaches maximum absorbing strength of -49.94 dB at 10.64 GHz; the effective absorption frequency width of the Fe / Co / C composite wave-absorbing material is 8.56-13.6 GHz, and the Fe / Co / C composite wave-absorbing material has an important application value in the field of wave-absorbing materials.

Description

technical field [0001] The invention belongs to the technical field of preparation of wave-absorbing materials, and relates to a method for preparing Fe / Co / C composite wave-absorbing materials based on pyrolysis of modified MOF materials. Background technique [0002] Electromagnetic pollution has seriously polluted the living environment of human beings to a certain extent. The electromagnetic radiation generated by various electronic products for daily life and electronic and electrical equipment for production has become the main factor of electromagnetic environmental pollution. Therefore, it is necessary to find solutions that can weaken or even eliminate electromagnetic radiation. The material - absorbing material. [0003] Absorbing materials can be divided into resistive type, dielectric type and magnetic dielectric type according to the material loss mechanism. Resistive absorbing materials mainly absorb electromagnetic waves by interacting with the electric field,...

Claims

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Application Information

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IPC IPC(8): C09K3/00
CPCC09K3/00
Inventor 姜炜彭诗思王素云郝嘎子胡玉冰
Owner NANJING UNIV OF SCI & TECH
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