Abstract Rice husk-based magnetic porous carbon with high porosity and magnetization was synthesized by pyrolysis of pretreated rice husk with FeCl3 and ZnCl2. Thermogravimetric analyses (TGA) of the precursors were used to characterize the mechanism of the pyrolysis progress. The effects of ZnCl2 impregnation ratio and pyrolysis temperature on the properties of magnetic porous carbon were identified by ultimate analyses, scanning electron microscopy (SEM), N2 adsorption-desorption isotherms, X-ray diffractometer (XRD), Raman spectrometer and vibrating sample magnetometer (VSM). Based on the results, the optimum ZnCl2 impregnation ratio of 1.0 and pyrolysis temperature of 600 °C were obtained when considering both of the porous characteristics and magnetic properties. Finally, the synergistic effect of combined pretreatment of hydrothermal carbonization (HTC) and alkali leaching and simultaneous activation and magnetization was confirmed as the possible reaction mechanism of synthesis of magnetic porous carbon from rice husk with the surface area of 1344.67 m2/g and saturation magnetization of 3.64 emu/g.

中文翻译：

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FeCl3和ZnCl2预处理稻壳热解稻壳基磁性多孔碳的合成与表征

摘要 采用FeCl3和ZnCl2对预处理过的稻壳进行热解，合成了具有高孔隙率和磁化强度的稻壳基磁性多孔碳。前体的热重分析 (TGA) 用于表征热解过程的机制。通过极限分析、扫描电镜(SEM)、N2吸附-解吸等温线、X射线衍射仪(XRD)、拉曼光谱仪和振动样品磁强计等研究了ZnCl2浸渍率和热解温度对磁性多孔碳性能的影响。 VSM）。根据研究结果，综合考虑多孔特性和磁性，得到了 1.0 的最佳 ZnCl2 浸渍比和 600 °C 的热解温度。最后，