Síntesis Sol Gel- Hidrotermal para obtención de TiO2 dopado fotoactivo en luz visible.

ELIANA PÉREZ; VITTORIO LUCA; VIVIANA MURGIA; EDGARDO SHAM

Santa Fé

Congreso; Congreso Internacional de Metalurgia y Materiales SAM CONAMET 2014; 2014

SAM CONAMET IBEROMAT

In the present work we have prepared TiO2 modified with nitrogen. The synthesis method used was sol gel from the hydrolysis of titanium tetrabutoxide with urea solution, combined with a low temperature hydrothermal treatment at atmospheric pressure. The theoretical mole ratio N/Ti was equal to 0.5 and the ratio HNO3/TiO2 = 0.5. The solid obtained was calcined at different temperatures in static air with high heating rate and residence time of 1 hour for each selected temperature. The samples were characterized by X-ray diffraction, Raman spectroscopy, diffuse reflectance, thermodifferential thermogravimetric analysis and specific surface area. All calcined solids exhibit absorption in the visible range. The Raman spectroscopy and X-ray diffraction revealed, for all of the heat treatments, the presence of crystalline phases corresponding to anatase and brookite polymorphism. The photocatalytic activity of the catalysts was tested in degradation of artificial dye under visible light, yielding the best results for the sample heat treated at 250°C. The synthesis technique used allows obtaining solids with textural and attractive photocatalytic properties.