A porous carbon / magnetic nanoparticle composite and a preparation method and application thereof

By combining Co-MOF-74 with grapefruit peel, a porous carbon/magnetic nanoparticle composite was prepared, which solved the problems of poor impedance matching of carbon-based materials and high cost of MOF materials, and realized the large-scale production of efficient and low-cost electromagnetic wave absorbing materials.

CN122444162APending Publication Date: 2026-07-24ZHEJIANG UNIV OF TECH
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Patent Information

Application Number
CN202610655844.2
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-05-13
Publication Date
2026-07-24

AI Technical Summary

Technical Problem

Existing carbon-based electromagnetic wave absorbing materials lack magnetic loss mechanisms and have poor impedance matching, which limits the improvement of their wave absorption performance. Furthermore, MOF materials are expensive and have complex preparation processes, making them difficult to apply on a large scale.

Method used

A porous carbon/magnetic nanoparticle composite was prepared by combining Co-MOF-74 with waste biomass grapefruit peel using a one-step hydrothermal reaction and high-temperature carbonization method. The electromagnetic parameters and impedance matching were optimized by controlling the microstructure and carbonization process.

Benefits of technology

Low-cost, high-performance electromagnetic wave absorbing materials were prepared, exhibiting good impedance matching characteristics and multiple electromagnetic wave loss mechanisms, demonstrating excellent wave absorption performance, and suitable for large-scale production.

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Abstract

The application discloses a kind of porous carbon / magnetic nanoparticle composite and its preparation method and application, the composite described in the application is that shaddock skin powder is mixed with cobalt source, 2,5-dihydroxy p-phenylenediamine terephthalate in solvent, precursor is obtained by hydrothermal reaction, and it is prepared by high-temperature carbonization under inert atmosphere.The morphology, size and graphitization degree of the magnetic nanoparticles in the composite can be effectively controlled by regulating the carbonization temperature in the application, so as to optimize the impedance matching and electromagnetic wave attenuation capacity of the material, and the composite prepared has excellent electromagnetic absorption performance, the minimum reflection loss value (RL min ) can reach-36.93 dB, and the effective absorption bandwidth (EAB) can reach 4.77 GHz, and has wide application prospect in the field of electromagnetic wave absorbing materials.
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