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iron nanoparticles (FeNPs) are the smallest particles of iron metal with high surface area and reactivity. They are a versatile magnetically active material that has found applications in electronics, medicine, imaging, environmental management and data storage.
The synthesis of iron nanoparticles can be performed by different technological routes/methods, such as reduction method and ion exchange methods, or by green synthesis approach using natural reducing agents, such as plants. The latter approach is becoming more popular because it avoids the toxicity of toxic reagents used in traditional industrially produced NPs and is also ecologically friendly.
Synthesis of magnetic iron NPs from iron-rich acid mine drainage waste solution with hydrazine is an efficient way to obtain a high quality iron nanoparticle with high reactivity and good biocompatibility, which could be applied in microbial control. The morphology of the synthesized iron nanoparticles was characterized with X-ray powder diffraction analysis and TEM analyses.
Isomer shifts of the quadrupole doublets (d1 = 0.49 +- 0.01 mm/s, d2 = 0.48 +- 0.05 mm/s) and a broad component associated with magnetic relaxation effects suggest that the sample is composed of ferrihydrite NPs that are undergoing the transformation to hematite/goethite. This is supported by the sextet component (d1 = – 0.17 +- 0.03, d2 = – 0.30 +- 0.1 mm/s) and the dr = 0.51+- 0.04 mm/s.
In recent years, the interest in a new generation of magnetic nanoparticles has increased due to their high biocompatibility, superparamaganetism, chemical inertness, and environmental friendliness. To make these NPs suitable for biomedical application, the strategic modification of ION architectures towards performing highly specialized functions is required.