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J Hazard Mater. 2009 Jun 15;165(1-3):774-9. doi: 10.1016/j.jhazmat.2008.10.060. Epub 2008 Nov 1.

Methylene blue degradation by NaTaO3 sol-gel doped with Sm and La.

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1
Departmento de Ecomateriales y Energía, Facultad de Ingeniería Civil, Universidad Autónoma de Nuevo León, San Nicolás de los Garza, Nuevo León 66450, México. letorre@fic.uanl.mx

Abstract

In this work, NaTaO(3) compounds doped with 1M% of La and Sm, were prepared by the sol-gel (SG) method and solid state (SS) reaction; and tested as photocatalysts on the degradation of methylene blue (MB) under UV light. The structural characterization by X-ray powder diffraction revealed that the crystallization of the NaTaO(3) phase prepared by the sol-gel method started at 600 degrees C, reaching maximum crystallization at 800 degrees C. It was determined that the presence of Sm and La retard the crystallization of the NaTaO(3) phase. On the other hand, the compounds synthesized in this work showed particle sizes in the nanometric scale, as it was observed by scanning electron microscopy (SEM). The specific surface area of the compounds synthesized by the sol-gel method, showed values 4 times higher than those obtained by the solid state reaction, favoring their functional and photocatalytic performance in the methylene blue degradation. In addition, the best photocatalytic performance was shown by the NaTaO(3) doped with Sm and heated at 600 degrees C, having a half-life time of 65 min.

PMID:
19042087
DOI:
10.1016/j.jhazmat.2008.10.060
[Indexed for MEDLINE]
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