Browsing by Autor "Luz Quispe"

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COMPARACIÓN ESTRUCTURAL Y MORFOLÓGICA DE TiO2 SINTETIZADOS POR LA RUTA DE LOS ATRANOS Y LA RUTA CONVENCIONAL EN EL MÉTODO SOL-GEL
(2011) Luís A. López; Luz Quispe; Pedro Flores Crespo; Marta I. Litter; Saúl Cabrera
Powder of TiO 2 was synthesized by the “route of the atranes” (new precursory Titanatrane) and for the conventional route (precursory alkoxide, Tetrabutil Titanato) both through sol-gel method, burned at 400, 500 and 600°C. The structural characterization and morphological by technical DRX, TOC, SEM and DRS are related with the temperature of burned and precursor to define the properties of the TiO 2. The TiO 2 obtained using Titanatrano precursory presents amorphous particles with microdomains crystalline in anatase phase, high organic content (394 ppm C/TiO 2 up to 400°C), narrow distribution in the average size of particle and quasi spherical morphology. The TiO 2 obtained using Alkoxide precursory present amorphous particles with crystalline microdominios in phases anatase and brookite at 400 and 500°C, and in phases anatase and rutile at 600°C, low organic content ( ≈ 5 ppm C/TiO 2), wide distribution in the average size of particle and irregular morphology. The magnitudes of the values in Bg correspond to the phases crystalline of anatase (400, 500 and 600°C both precursors) and rutile (600°C Alkoxide). The differences in the properties of TiO2 are explained in function to the behaviours of the precursors in the process sol-gel and in the process of burned.
ELIMINACIÓN DE CIANURO MEDIANTE SISTEMA COMBINADO UV/H2O2/TiO2
(2011) Luz Quispe; María del Carmen Arteaga; Édgar Enrique Martínez Cárdenas; Luis López c; Carlos Santelices; Eduardo Palenque; Saúl Cabrera
In the present work, aqueous cyanide has been eliminated by addition of H2O2 as oxidant agent, and by heterogeneousphotocatalysis with titanium oxide activat...
NUEVOS OXIDOS DE TITANIO DOPADOS (Yb, Nd, La y Li) PARA LA REDUCCION FOTOCATALITICA DE CROMO HEXAVALENTE
(Universidad Autónoma del Estado de México, 2010) Luz Quispe; Luís A. López; Víctor Teixeira; Saúl Cabrera
"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 electronicmicroscopy (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."