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Synthesis Characterization and Photocatalytic Studies of Cobalt Ferrite-Silica-Titania Nanocomposites

1
School of Chemistry and CRANN, Trinity College Dublin, Dublin 2, Ireland
2
St. Petersburg National Research University of Information Technologies, Mechanics and Optics, St. Petersburg 197101, Russia
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Author to whom correspondence should be addressed.
Nanomaterials 2014, 4(2), 331-343; https://doi.org/10.3390/nano4020331
Received: 23 February 2014 / Revised: 11 April 2014 / Accepted: 11 April 2014 / Published: 23 April 2014
(This article belongs to the Special Issue Magnetic Nanomaterials)
In this work, CoFe2O4@SiO2@TiO2 core-shell magnetic nanostructures have been prepared by coating of cobalt ferrite nanoparticles with the double SiO2/TiO2 layer using metallorganic precursors. The Transmission Electron Microscopy (TEM), Energy Dispersive X-Ray Analysis (EDX), Vibrational Sample Magnetometer (VSM) measurements and Raman spectroscopy results confirm the presence both of the silica and very thin TiO2 layers. The core-shell nanoparticles have been sintered at 600 °C and used as a catalyst in photo-oxidation reactions of methylene blue under UV light. Despite the additional non-magnetic coatings result in a lower value of the magnetic moment, the particles can still easily be retrieved from reaction mixtures by magnetic separation. This retention of magnetism was of particular importance allowing magnetic recovery and re-use of the catalyst. View Full-Text
Keywords: magnetic nanoparticles; core-shell; silica; titanium dioxide; photocatalysis; magnetic separation magnetic nanoparticles; core-shell; silica; titanium dioxide; photocatalysis; magnetic separation
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Greene, D.; Serrano-Garcia, R.; Govan, J.; Gun'ko, Y.K. Synthesis Characterization and Photocatalytic Studies of Cobalt Ferrite-Silica-Titania Nanocomposites. Nanomaterials 2014, 4, 331-343.

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