回收造纸污泥制备低成本Ni改性碳/硅复合材料用于高效微波吸收

doi:10.1016/j.actphy.2026.100417

Abstract

Abstract: Biomass-derived magnetic-dielectric synergistic composites have drawn extensive attention for microwave absorption (MA) due to their wide sources, low-cost, and unique structures. In this work, Ni-modified carbon/silica (Ni/C/SiO₂) composites from paper mill sludge (PMS) were successfully synthesized using a combination of demineralization, impregnation, and sintering processes. By regulating the sintering temperature, the Ni particle distribution and the compositing of the porous carbon skeleton with SiO₂ present in internal ash were optimized, enhancing the magnetic-dielectric synergy and yielding superior impedance matching and electromagnetic wave attenuation. In particular, Ni/C/SiO₂ composite sintering at 700 ℃ (NCS-700) demonstrated excellent microwave absorption performance, achieving an effective absorption bandwidth (EAB) of 5.6 GHz and a minimum reflection loss (RL_min) of -39.2 dB at a matching thickness of 2.0 mm. This superior performance originates from the synergistic enhancement of multiple loss mechanisms, including dipole/interface polarization relaxation, conductive loss, and magnetic loss. This work not only opens up new prospects for PMS recycling but also provides a facile and cost-effective route to designing broadband microwave absorbers.

Key words: Paper mill sludge, Microwave absorption, Impedance matching, Interface polarization, Solid waste utilization

Baoshun Zhu, Xinyan Wang, Weipeng Mu, Xuanpeng Sun, Yubo Wang, Hongyu Wei, Pangyu Shi, Huilan Hao, Dashuang Wang, Guomin Li, Guizhen Wang. Recycling paper mill sludge to prepare low-cost Ni-modified carbon/silica composite for efficient microwave absorption[J]. Acta Phys. -Chim. Sin. 2026, 42(11), 100417. doi: 10.1016/j.actphy.2026.100417

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Recycling paper mill sludge to prepare low-cost Ni-modified carbon/silica composite for efficient microwave absorption

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