Lignin-based magnetic hollow porous carbon nanofiber composite(HPCNFs), with the bagasse acetate lignin spinning solution as shell layer, added polyvinylpyrrolidone as forming porous soft template and iron acetylacetonate as the magnetic precursor, and the styrene acrylonitrile copolymer solution as core layer, were manufactured by coaxial electrospinning and carbonization technique. The morphology and element analysis were observed by scanning electron microscope-energy dispersive spectrometer, and the phase qualitative analysis, porous characteristics and magnetic properties were analyzed by X-ray diffractometer, specific surface and porosity analyzer and vibrating sample magnetometer, respectively. Finally, the electromagnetic parameters and microwave absorption performance of HPCNFs in the frequency range of 1-18 GHz were analyzed and compared by a vector network analyzer. The results showed that all HPCNFs samples were ferromagnetic, and the carbon nano-fiber composite with the highest addition of iron acetylacetonate at 25% had the highest saturation magnetization of 3.16 emu/g; while the addition of iron acetylacetone at 10% showed the best microwave absorption performance with the minimum reflection loss was -11. 1 dB, and the bandwidth with reflection loss below -5 dB was 3.05 GHz (5.78-8.83 GHz), and the bandwidth below -10 dB was 0.72 GHz (6.63-7.35 GHz). Finally, the interaction and the possible microwave absorption mechanism between HPCNFs and microwave are briefly discussed. The prepared biomass-based carbon nanofiber composite has great development potential in microwave-absorbing carbon materials. © 2020, Materials Review Magazine. All right reserved.
