Besaha H. Synthesis, structure formation and photocatalytic properties of nanocrystalline titanium(IV) oxide, doped with sulfur.

The thesis is devoted to the obtaining nanocrystalline powders of titanium(IV) oxide doped with sulfur, and the influence of sulfur on the structure, properties and photocatalytic ability of powders.To create a competitive material is relevant to improving photocatalytic properties of TiO2, in particular, which may realize through modification of its structure. Actually increased interest in nano-powder of titanium(IV) oxide, doped with sulfur, due to its resulting high photocatalytic activity.Optimal conditions for synthesis of nanocrystalline powder S-TiO2 by sol-gel and solid-phase methods have been established. It was substantiated and experimentally confirmed that the formation of nano-particles surface of S-TiO2 synthesized by the two methods are different. It was proved that hydrothermal processing of sols in an autoclave allows synthesizing powders with the highest specific surface. The structural characteristics of synthesized powders have been investigated and the possible structural formula has been suggested.Effectiveness of nanocrystalline S-TiO2 in the process of photocatalytic evolving of molecular hydrogen from water-alcohol mixtures under UV light and in the process of decomposition of dyes and volatile organic compounds under visible as well as UV light have been confirmed