INVESTIGATION OF THE STRUCTURE AND DISPERSION OF PHOTOACTIVE NANOCRYSTAL TiO
2 POWDERS
D. V. Dyagilev1, T. A. Larichev1, V. M. Pugachev1,2, A. A. Vladimirov1,2, L. V. Sotnikova1, T. S. Manina2, A. Yu. Stepanov1, Yu. N. Dudnikova1
1Kemerovo State University, Kemerovo Russia
2Institute of Coal Chemistry and Material Science, Siberian Branch, Russian Academy of Sciences, Kemerovo, Russia
Keywords: диоксид титана, анатаз, рутил, фотокатализатор, синтез, золь-гель метод, адсорбция, titanium dioxide, anatase, rutile, photocatalyst, synthesis, sol-gel method, adsorption
Abstract
Effect of the pH in the synthesis of ammonium titanate gel and the temperature of xerogel dehydration on the phase composition, degree of crystallinity, and dispersion of photoactive TiO
2 powders is investigated. The possibility of preparing a metastable anatase modification of TiO
2 with high crystallinity is shown. The textural, adsorption, and photocatalytic characteristics of the obtained dispersions are studied. Using atomic force microscopy (AFM) and spectral turbidimetry, the presence of particle aggregates and intergrowns causing the TiO
2 coloring by organic dyes in the aqueous dispersions of photocatalysts is found.
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