Strontium tantalum oxides with perovskite-type structure: synthesis and dye photodecomposition properties

In this work the preparation and photocatalytic properties of strontium tantalum oxides with perovskite-type structures are presented. The perovskite-type oxides were prepared by the sol–gel method and annealed at 800, 900 and 1,000 °C for 36 h. Before and after annealing the solids were characteriz...

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Bibliographic Details
Published in:Research on chemical intermediates 2009-02, Vol.35 (2), p.187-196
Main Authors: Rodríguez-González, V., García-Montelongo, X. L., Garza-Tovar, L. L., Lee, Soo Wohn, Torres-Martínez, L. M.
Format: Article
Language:English
Subjects:
Catalysis
Chemistry
Chemistry and Materials Science
Inorganic Chemistry
Physical Chemistry
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Summary:In this work the preparation and photocatalytic properties of strontium tantalum oxides with perovskite-type structures are presented. The perovskite-type oxides were prepared by the sol–gel method and annealed at 800, 900 and 1,000 °C for 36 h. Before and after annealing the solids were characterized by XRD, N 2 adsorption (BET), UV–visible (diffuse reflectance), FTIR, TGA–DTA, and SEM-EDS techniques. The X-ray diffraction patterns of the samples showed the coexistence of three strontium tantalate oxides, Sr 2 Ta 2 O 7 , SrTa 4 O 11 , and Sr 5 Ta 4 O 15 , the relative amounts of which were highly dependent on the annealing temperature. It has been proposed that the photoactivity of the oxides in the decomposition of crystal violet dye could be related to the proportion of the Sr 2 Ta 2 O 7 phase in the annealed samples.
ISSN:0922-6168
1568-5675
DOI:10.1007/s11164-008-0021-5