Preparation, characterization and photocatalytic properties of TiO2 nanostructured spheres synthesized by the Sol–Gel method modified with ethylene glycol
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Monodispersed nanostructured TiO2 spheres were obtained by the Sol–Gel method modified with ethylene glycol. The sample morphology and surface textural properties were characterized by X-ray diffraction (XRD), N2-physisorption, scanning electron microscopy (SEM), transmission electron microscopy (TEM), thermogravimetric analysis (TGA) and diffuse reflectance spectroscopy (DRS). The SEM image showed spheres with sizes ranging from 600 to 700 nm. In addition, HRTEM micrographs reveal hexagonal grains slightly elongated (20 nm). The powders present a BET surface area of 116 m2 g−1. Samples without thermal treatment and those treated at 400 °C both showed characteristic reflections of the anatase phase. The photocatalytic activity of the prepared TiO2 spheres was determined by degradation of 2,4-dichlorophenoxyacetic acid (2,4-D) in aqueous solution. Kinetics parameters have displayed than the nanostructured material present a reaction half-life time of 30 min and it was two times faster than commercial TiO2 (P25).
KeywordsTiO2 spheres Photocatalysis 2,4-Dichlorophenoxyacetic acid Sol–Gel
We wish to thank to PROMEP-SEP (103.5/08/3125 and 103.5/08/5466), CONACYT (089620, 081437), PAICYT UANL-2009 and the UANL foundation. K. Del Ángel-Sanchez wishes to express her gratitude to the CONACYT for her PhD grant.
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