Journal
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
Volume 217, Issue 2-3, Pages 383-388Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jphotochem.2010.11.010
Keywords
TiO2-CeO2 photocatalysts; Titanium deficiency; 2,4-Dichlorophenoxyacetic acid; photodegradation; Titania-ceria band gap; Titania-ceria Rietveld analysis
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Funding
- CONACYT
- CONACYT-SEP [62053]
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TiO2-CeO2 mixed oxides were synthesized by the sol-gel method and calcined at 473, 673 and 873 K. The preparation method enabled us to obtain TiO2-CeO2 mixed oxides with specific surface areas of 250, 174 and 99 m(2)/g. An important effect of the thermal treatment on the band gap of the TiO2-CeO2 mixed oxides was observed. The E-g band gap shifts from 3.1 to 3.2 eV, for the TiO2 bare catalysts, to 2.3-2.5 eV on the annealed mixed oxides. The X-ray Rietveld refinement shows that the calculated titanium deficiency diminishes as the annealing temperature of the mixed oxides is increased. A relationship between the titanium deficiency per unit cell (from 44.8 to 20.0%) the Eg band gap (2.3-2.5 eV) and the capacity for the herbicide photodegradation (from 85.6 to 94.5%) was observed. (C) 2010 Elsevier B.V. All rights reserved.
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