Abstract
Titania–silica, titania–alumina, and titania–zirconia mixed oxides (1:1 molar ratio) were prepared by a microwave-induced solution combustion synthesis technique. The prepared materials were characterized by thermogravimetry/differential thermal analysis, X-ray diffraction (XRD), Raman spectroscopy, BET surface area, X-ray photoelectron spectroscopy (XPS), ultraviolet–visible diffuse reflectance spectroscopic (UV–Vis DRS), and Fourier transform infrared (FTIR) techniques to assess their physicochemical properties. Their photocatalytic activity for the degradation of phenol in aqueous solution under sunlight was studied. XRD and Raman studies revealed the presence of titania in the form of anatase phase in all the mixed oxides synthesized. The XRD studies further suggested that titania–zirconia contains an additional (Ti,Zr)O2 phase. UV–Vis DRS results reveal that all samples exhibit absorption maxima near visible region. FTIR results revealed the presence of Ti–O–Si linkages in the titania–silica sample, which are responsible for its higher activity in the photocatalytic degradation of phenol under sunlight.
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Acknowledgements
G.K.R. and K.N.R. thank UGC, New Delhi, India, for senior research fellowships. The authors also acknowledge the support of CICECO.
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Reddy, B.M., Reddy, G.K., Rao, K.N. et al. Characterization and photocatalytic activity of TiO2–M x O y (M x O y = SiO2, Al2O3, and ZrO2) mixed oxides synthesized by microwave-induced solution combustion technique. J Mater Sci 44, 4874–4882 (2009). https://doi.org/10.1007/s10853-009-3743-x
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DOI: https://doi.org/10.1007/s10853-009-3743-x