Abstract

Magnetic titanium dioxide particles were prepared by depositing different amounts of TiO₂ on magnetite powder using a sol-gel process. Adsorptivity of TiO₂/Fe₃O₄ particles was increased by carbon coating which was carried out by mixing the particles with poly (vinyl alcohol) as a source of carbon. The carbon coating and calcination of particles were carried out simultaneously by heating the mixture at different temperatures. X-ray diffraction, energy dispersion fluorescence x-ray spectrometry, carbon-nitrogen analyzer and surface area analysis were used for the characterization of the prepared samples. The phase transition temperature of TiO₂ from anatase to rutile was found to decrease by decreasing titanium tetraisopropoxide to magnetite (TTIP:Fe₃O₄) ratio while BET surface area increased by increasing this ratio. Carbon content had a significant effect on the formed phases and surface areas of the samples. The photocatalytic efficiencies of the prepared samples were investigated against degradation of methyl orange. The effect of TTIP:Fe₃O₄ ratio and carbon content on the degradation rate were studied. Methyl orange degradation rate increased with the increase in TTIP:Fe₃O₄ ratio but decreased by increasing carbon content.

Recommended Citation

Gad Allah, Tarek A.; Kato, Shigeru; Satokawa, Shigeo; and Kojima, Toshinori (2008) "Effect of Carbon Coating of TiO₂/Fe₃O₄ Particles on Their Photocatalytic Activity," International Journal of Chemical Reactor Engineering: Vol. 6: A15.
Available at: http://www.bepress.com/ijcre/vol6/A15