Rice husk char,a by-product derived from rice husk gasification in the industrial setting,was utilized as the precursor to synthesize magnetic composites (Fe3O4@NRHC) through nitrogen-doping and Fe3O4 loading.The Fe3O4@NRHC exhibited superior electromagnetic wave absorbing performance,with a minimum reflection loss of -54.67dB at a corresponding absorber thickness of 3mm and an effective absorption bandwidth of 2.22GHz.This absorption mechanism could be attributed to multiple factors including the composite's high conductivity,hierarchically porous structure,and multi-polarization relaxation.The hierarchically porous structure facilitated the deeper penetration of electromagnetic waves into the material.The high conductivity and rich interface polarization and dipole polarization greatly enhanced the dielectric loss ability of Fe3O4@NRHC.This study focused on the modification of the electromagnetic parameters of rice husk char via nitrogen doping and Fe3O4 loading,aiming to improve the absorption capacity for electromagnetic waves across various frequency bands.
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基金资助
武汉科技大学煤转化与新型炭材料湖北省重点实验室开放基金项目(WKDM202107)
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