Technologies involving iron-based nanomaterials, such as nanoscale zero-valent iron (nZVI), are extensively used for elimination of various contaminants in the environment. In this study, we modified commercial nZVI particles NANOFER 25P (from NANO IRON company, CZ) via one-step thermal treatment under different conditions (including temperature, time, and atmosphere), in a way that has not been previously reported. The structural, magnetic and air-stability aspects of the as-prepared materials were investigated by means of X-ray powder diffraction, Mössbauer spectroscopy, and magnetic and surface area measurements. The characterization revealed that each of the materials is dominantly formed by different crystalline phase (i.e., iron nitrides Fe4N and Fe2.43N, FeO, and Fe3C) and that the modification occurred in almost entire volume of the particles rather than only on the surface. Moreover, the as-prepared materials were evaluated for their efficiency of Cr(VI) removal and compared with bare nZVI used for their preparation.Keywords: Solid state reaction, modification, iron nitride, iron carbide, characterization
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