The aim of the present study is developing of new materials with tunable microstructure based on surfactant templated mesoporous TiO₂ and understanding of correlations between structural parameters and functional properties such as catalytic and photocatalytic activity.

Mesoporous titanium dioxide was obtained using Ti(OⁱPr) as titanium source and non-ionic surfactant (Pluronic P123) as a template. The samples were characterized by XRD, nitrogen sorption at 77K, XRD, TEM, UV-Vis and FTIR-spectroscopy. Mesoporous titanium dioxide obtained during our work has rather high specific surface area (up to 320 m²/g), narrow pore size distribution with average pore size 2.4 nm and nanocrystalline pore walls which consist of anatase and brookite. Photocatalytic activity was measured in test reaction of methyl orange dye oxidation. High photocatalytic activity of mesoporous titania is determined by both surface area of the catalyst and features of phase composition.

Optical properties of mesoporous TiO₂ have been modified via doping by iron, zinc, cerium and nitrogen. The doping does not influence strongly on the microstructure of the samples and leads to the red shift of the absorption band.

Also mesoporous titanium oxide was used as a support for gold nanoparticles. Nanocomposites have been studied using TEM and DRIFTS with CO probe molecules. The confinement of the nanoparticles inside the pores allows to avoid aggregation and to enhance the stability of the catalysts.

This work was supported by RFBR (grants №№ 06-03-89507, 06-08-01443) and FASI (grant № 02.523.12.3015)

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