NUEVOS OXIDOS DE TITANIO DOPADOS (Yb, Nd, La y Li) PARA LA REDUCCION FOTOCATALITICA DE CROMO HEXAVALENTE
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Rev. Bol. Quim
Abstract
TiO2-puro y TiO2-dopados con Yb, Nd, La y Li fueron sintetizados por la Ruta de los Atranos, todos los óxidos tienen porosidad en el rango de los mesoporos. Varias técnicas de caracterización han sido aplicadas: difracción de rayos-X (DRX), adsorción-desorción de gases (BET), espectroscopia de reflectancia difusa (DRS), microscopia electrónica de transmisión (TEM). Los materiales fueron examinados como fotocatalizadores para la reducción de Cr(VI) en presencia de un donador de electrones, ácido etilendiaminotetraacético (EDTA). La incorporación de Nd y Yb en el TiO2 desplaza le energía del ancho de banda prohibida hacia la región visible, éstos óxidos mostrados fase anatase cristalina y propiedades apropiadas de adsorción del Cr(VI) y EDTA, resultando en mejoras en la fotoactividad comparadas a titania pura y los dopados con La y Li
TiO2-pure and TiO2-doped with Yb, Nd, La and Li were synthesized by the atrane route, all oxides were found with porosity in the range of mesoporous. Several techniques of characterization have been applied: X-ray diffraction (XRD), adsorption-desorption (BET), diffuse reflectance spectroscopy (DRS) and transmission electronic microscopy (TEM). The materials were tested as photocatalysts for the reduction of Cr(VI) in presence of a electron donor, ethylenediaminetetraacetic acid (EDTA). Incorporation of Nd and Yb on TiO2 shift the energy of the band gap toward visible region, these oxides showed anatase phase crystalline and suitable adsorption properties for Cr(VI) and EDTA, resulting in higher photoactivities compared to pure titania and La and Li-dopants. Corresponding author: *saulcabreram@correo.umsa.bo
TiO2-pure and TiO2-doped with Yb, Nd, La and Li were synthesized by the atrane route, all oxides were found with porosity in the range of mesoporous. Several techniques of characterization have been applied: X-ray diffraction (XRD), adsorption-desorption (BET), diffuse reflectance spectroscopy (DRS) and transmission electronic microscopy (TEM). The materials were tested as photocatalysts for the reduction of Cr(VI) in presence of a electron donor, ethylenediaminetetraacetic acid (EDTA). Incorporation of Nd and Yb on TiO2 shift the energy of the band gap toward visible region, these oxides showed anatase phase crystalline and suitable adsorption properties for Cr(VI) and EDTA, resulting in higher photoactivities compared to pure titania and La and Li-dopants. Corresponding author: *saulcabreram@correo.umsa.bo
Description
Vol. 27, No. 1