Synthesis of N-TiO2Effect of the Concentration of Nitrogen in the Band Gap

E. G. PEREZ; E. M. FARFÁN TORRES; G. MORALES; V. MURGIA; EDGARDO SHAM

Procedia Materials Science

Elsevier

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

In this work TiO2 modified with nitrogen was synthesized by sol-gel method from the hydrolysis of titanium isopropoxide withurea solution in different concentrations so that the theoretical N/Ti molar ratio was equal to 0, 0.5, 1 and 2, calcined at 400°C.The samples were characterized by diffuse reflectance spectroscopy, thermo differential analysis and Raman spectroscopy. TheTiO2 synthesized without nitrogen are active only under ultraviolet radiation, while samples containing nitrogen absorbed in thevisible range. In Raman spectra the characteristic peaks of the crystalline anatase phase were observed with a slight shift and adecrease of the crystallization grade with the increase of the N/Ti ratio. The analysis of photoactivity of the modified catalyst inthe degradation of tartrazine under visible light is analyzed.