Synthesis of N-TiO2 Effect of the Concentration of Nitrogen in the Band Gas

ELIANA PEREZ; MÓNICA FARFÁN TORRES; GRACIELA MORALES; VIVIANA MURGIA; EDGARDO SHAM

Procedia Materials Science

Elsevier

Lugar: Buenos Aires; Año: 2015 vol. 8 p. 649 - 655

2211-8128

In this work TIO2 modified with nitrogen was synthezied by sol-gel method form the hydrolisis of titanium isopropoxide with urea solution in different concentrations so that the theorical N/Ti molar ratio was equal to 0, 0.5, 1 and 2 calcined at 400°C. The samples was characterized by diffuse reflectance spectroscopy, thermo differential analysis and Raman spectroscopy. The TiO2 synthesized without nitrogen are active only under ultraviolet radiaton, while samples containing nitrogen absorbed in the visible range. In Raman spectra the characteristic peaks of crystalline anatase phase was observed with a slide shift and a decrease of a crystallization grade with the increase of N/Ti ratio. The analysis of the photoactivity of the modified catalyst in the degradation of tartrazine under visible light was analyzed.