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

Nanomaterials

David Greene¹  Raquel Serrano-Garcia¹  Joseph Govan¹ 

[1] School of Chemistry and CRANN, Trinity College Dublin, Dublin 2, Ireland; E-Mails:

关键词: magnetic nanoparticles;    core-shell;    silica;    titanium dioxide;    photocatalysis;    magnetic separation;   

DOI  :  10.3390/nano4020331

来源: mdpi

【 摘 要 】

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.

【 授权许可】

CC BY   
© 2014 by the authors; licensee MDPI, Basel, Switzerland.