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Title: Synthesis, characterization and photocatalytic activity of alkaline earth metal doped titania
Authors: Avasarala, Balaram Kiran
Tirukkovalluri, Siva Rao
Bojja, Sreedhar
Keywords: Catalysts
Issue Date: Sep-2010
Publisher: CSIR
Abstract: The synthesis of beryllium doped titania (Be<sup>2+</sup>–TiO<sub>2</sub>) at different percentages (0.25, 0.5, 0.75 and 1.0 wt %) by sol-gel method and its characterization by XRD, UV-visible absorption spectroscopy, XPS, SEM and FT-IR techniques are reported. Diffraction peaks of anatase crystalline phase have been observed both in synthesized TiO<sub>2</sub> as well as in Be<sup>2+</sup>–TiO<sub>2</sub>. Presence of Be<sup>2+</sup> ions in the TiO<sub>2 </sub>structure causes significant absorption shift towards the visible region. FT-IR and XPS data show the interstitial presence of Be<sup>2+</sup> ion in TiO<sub>2</sub>. The photocatalytic efficiency of the synthesized Be<sup>2+</sup>–TiO<sub>2</sub> and unsubstituted TiO<sub>2</sub> has been evaluated by the degradation of monocrotophos pesticide under visible light irradiation, wherein the degradation rate of MCP by Be<sup>2+</sup>–TiO<sub>2</sub> is found to be higher than by unsubstituted TiO<sub>2</sub>.<sub> </sub>This may be attributed to the more efficient electron-hole creation in Be<sup>2+</sup>–TiO<sub>2</sub> in visible light, as compared to unsubstituted TiO<sub>2</sub> which can be excited only by UV irradiation. The effect of dopant concentration, <i style="">p</i>H, catalyst dosage and pollutant concentration have been studied for obtaining optimal degradation conditions.
Description: 1189-1196
ISSN: 0975-0975(Online); 0376-4710(Print)
Appears in Collections:IJC-A Vol.49A(09) [September 2010]

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