IRON CARBON NANOCOMPOSITES BASED ON SYNTHETIC HUMIC SUBSTANCES AND THEIR MAGNETIC PROPERTIES
DOI:
https://doi.org/10.32782/pcsd-2022-1-5Keywords:
synthetic humates, iron, nanocomposites, pyrolysis, amorphous carbonAbstract
Metal nanoparticles encapsulated in a carbon matrix are of considerable interest in connection with the prospects for their use in the creation of new materials for technology and medicine. Metal-carbon nanocomposites containing transition metal nanoparticles are of great importance for industry. The aim of the work is the synthesis of an ironcarbon nanocomposite using synthetic humic substances as a source of carbon and studying the properties of the resulting product. The iron-carbon nanocomposite was obtained by ferum(III) humate pyrolysis in an H2 hydrogen atmosphere. The ferum(III) humate used in the work was obtained by precipitation from a synthetic sodium humate solution by Fe3+ ions. The resulting FeC nanocomposite is described by X-ray diffraction, X-ray fluorescence analysis, and scanning electron microscopy. It has been established that the resulting iron-carbon nanocomposite contains metallic iron with fcc and bcc lattices. It is shown that the average particle size in the pyrolysis temperature range of 300-1000 ºС varies from 9.8 to 52.5 nm. The mass fraction of iron in the composite increases from 29 to 41% with an increase in the synthesis temperature. The study of the magnetic properties of the obtained nanocomposites made it possible to establish that in the temperature range below 320 K they exhibit ferromagnetism, and in the range of 320 K they undergo a transition to the superparamagnetic state. The important result of the study is the dependence of the specific magnetization of the samples on the iron content and nanoparticle sizes, which makes it possible to control the magnetic characteristics when changing the synthesis parameters.
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