Ion reduction in iron oxide and oxyhydroxide nanoparticles during ultrasonic treatment

Stolyar, S. V.; Bayukov, O. A.; Yaroslavtsev, R. N.; Knyazev, Yu. V.; Ladygina, V. P.; Gerasimova, Yu. V.; Iskhakov, R. S. Source: ADVANCED POWDER TECHNOLOGY, 30 (11):2620-2625; 10.1016/j.apt.2019.08.009 NOV 2019

The effect of ultrasonic treatment of iron oxide and iron oxyhydroxide nanoparticles (ferrihydrite nanoparticles synthesized by Klebsiella oxytoca microorganisms, ferrihydrite nanoparticles synthesized by a chemical method and hematite nanoparticles) is studied. Samples of nanoparticles were investigated using transmission electron microscopy, Mössbauer spectroscopy and X-ray diffraction methods. The formation of the α-Fe metal phase from nanoparticles of iron oxides and iron oxyhydroxides was detected. The metal phase is formed as a result of the reduction of iron ions during cavitation treatment. According to the experimental results, the presence of a protein or a polysaccharide component is necessary for the course of this reaction.