Bavykin, Dmitry V., Dubovitskaya, Vera P., Vorontsov, Alexander V. and Parmon, V.N.
Effect of TiOSO4 hydrothermal hydrolysis conditions on TiO2 morphology and gas-phase oxidative activity
Research on Chemical Intermediates, 33, (3-5), . (doi:10.1163/156856707779238702).
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The effect of synthesis conditions on morphology and catalytic activity has been studied
for hydrothermal preparation of TiO2 from acidified aqueous TiOSO4 solution. It was found that
the increase in TiOSO4 and H2SO4 concentration results in the increase of photocatalytic activity of
produced TiO2, as it was revealed by steady-state gas-phase oxidation of acetone and ethanol vapors in
a flow-circulating reactor. TiOSO4 concentration exerts strong influence on the shape of the produced
TiO2 particles. At TiOSO4 concentration less than 0.1 wt%, hydrolysis gives rise to hedgehog-like
agglomerates consisting of spliced-blade TiO2 nanocrystals. At higher concentration of TiOSO4, the
resultant TiO2 consists of round agglomerates of 5–10 nm primary particles. The size of secondary
particles depends mainly on the H2SO4 concentration. The increase of the time of hydrothermal
treatment results in the enhancement of TiO2 photocatalytic activity that reaches a maximum. Among
different acids (HCl, HClO4, HNO3, H3PO4 and CH3COOH) added during hydrolysis of TiOSO4,
sulfuric and acetic acids had the best effect on photocatalytic activity of TiO2. The results obtained
can help to finely tune this TiO2 preparation method in order to obtain desirable particles size, shape
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