Adsorption of Organic Dyes by Fe3O4@C, Fe3O4@C@C, and Fe3O4@SiO2 Magnetic Nanoparticles

Ivanova, O.S., Edelman, I.S., Sokolov, A.E., (...), Lin, C.R., Chen, Y.Z.// Bulletin of the Russian Academy of Sciences: Physics//

https://doi.org/10.3103/S1062873822701192

Fe₃O₄@C, Fe₃O₄@C@C, and Fe₃O₄@SiO₂ core–shell nanoparticles are synthesized via thermal decomposition and coprecipitation. Samples are characterized via X-ray spectroscopy, transmission electron microscopy, and magnetometry. It is shown that the magnetic core of all nanoparticles is nanocrystalline and has crystal parameters corresponding to only one phase of Fe₃O₄, covered with a uniform shell of amorphous carbon or silicon oxide around 8 nm thick. Special attention is given to adsorption properties of the nanoparticles with respect to four dyes: Methylene blue, Congo Red, Eosin Y, and Rhodamine C. The high selectivity of Fe₃O₄@C nanoparticles to various dyes is revealed.