A novel method was used to prepare a nano-structured 32 wt% Fe/FeS core/shell powder via a mechano-thermal route by 1-h heat treatment of a mechanically activated powder mixture of Fe and S. The structural and microstructural characteristics, formation mechanism, magnetic properties, and photocatalytic activity of the powder were studied by X-ray diffraction, field emission scanning electron microscopy, transmission electron microscopy, surface area analysis, differential scanning calorimetry, vibrating sample magnetometry, and UV–vis spectrophotometry. A detailed study of the mechanism of transformation showed that during the heat treatment process, an FeS₂ phase was formed as the intermediate product. In the final product, an FeS shell approximately 2 nm in thickness was formed on the Fe core. In the presence of NaCl as a process control agent, the particle size decreased and the size distribution became more uniform. Mechanical activation and NaCl addition together led to a decrease of the saturation magnetization from 82 to 74 emu/g. The photocatalytic activity of the powder in the degradation of methylene blue was 50%.

一种新颖的方法用于通过机械热途径，通过对Fe和S的机械活化粉末混合物进行1 h热处理，以机械热途径制备纳米结构的32％（重量）的Fe / FeS核/壳粉末。通过X射线衍射，场发射扫描电子显微镜，透射电子显微镜，表面积分析，差示扫描量热法，振动样品磁强度法和紫外可见分光光度法研究了粉末的形成机理，磁性和光催化活性。对转变机理的详细研究表明，在热处理过程中，FeS ₂相形成为中间产物。在最终产品中，在Fe核上形成了厚度约为2 nm的FeS壳。在NaCl作为过程控制剂的存在下，粒径减小并且尺寸分布变得更均匀。机械活化和NaCl的添加一起导致饱和磁化强度从82emu / g降低到74emu / g。该粉末对亚甲基蓝的降解的光催化活性为50％。