For defusing the low-frequency microwave radiation contamination, herein, a group of BPC-CoFe₂O₄/CoFe@C composites were obtained by regulating the bio-based porous carbon with two different routes, solvothermal loading of magnetic particles and subsequent annealing treatment. The investigation reveals the technical parameters have great effect on the microwave absorption mechanism of prepared absorbents, in which the APC-700 possesses excellent impedance matching characteristic within a wide low-frequency range, and integrated with multi-level polarization, eddy current loss of magnetic alloy, natural resonance of ferrite, electron hopping and conduction loss, and structural dissipation with special porous morphology, it can achieve broad low-frequency EAB of 2.15 GHz at only 1.5 mm, with a maximal RL of −39.48 dB at 1.22 GHz for 2 mm. This forebodes the potential application of composite prepared here to solve the mentioned low-frequency radiation contamination.

为了消除低频微波辐射污染，在此，一组BPC-CoFe ₂ O ₄/CoFe@C 复合材料是通过两种不同的途径调节生物基多孔碳，即磁性颗粒的溶剂热负载和随后的退火处理。研究表明，技术参数对制备的吸收剂的微波吸收机理有很大影响，其中APC-700在较宽的低频范围内具有优异的阻抗匹配特性，并集成了多级极化、磁涡流损耗合金、铁氧体的自然共振、电子跳跃和传导损耗，以及具有特殊多孔形态的结构耗散，它可以在仅 1.5 mm 处实现 2.15 GHz 的宽低频 EAB，在 1.22 GHz 时最大 RL 为 −39.48 dB，持续 2毫米。