Abstract
In the framework of pollutant sequestration by magnetic nano materials, this work focuses on the synthesis and the physico-chemical properties of starch functionalized nano magnetites. Nanoparticles were prepared by the Fe2+/Fe3+ coprecipitation method with increasing amount of starch in the synthesis medium (starch to iron mass ratio (R) in the range 0–10). Obtained materials were characterized by Transmission Electron Microscopy (TEM), Powder X-Ray Diffraction (PXRD), Raman, Fourier Transform Infrared (FTIR) and 57Fe Mössbauer spectroscopies, as well as by vibrating sample magnetometry. The presence of starch into the synthesis medium lowers magnetite crystallinity and increases the dispersion of the oxide particles. Both effects lead to fast relaxing superparamagnetic particles at RT for high R. The role of starch on nano-magnetite growth and stabilization is evidenced.
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