Abstract
The structural transformation behavior of Na 2 Ti 3 O 7 by hydrolysis was investigated in mild and strong acidic aqueous medium. Compared with K 2 Ti 4 O 9 , Na 2 Ti 3 O 7 exhibits quite different structural and morphological transformation behavior despite their similar layered structural characteristics. TiO 2 (B) obtained by heat treatment of H 2 Ti 3 O 7 at 350 °C transforms to rutile TiO 2 at 900 °C. This temperature is much lower than 1200 °C, the temperature for anatase to rutile transition when K 2 Ti 4 O 9 is used as a starting titanate. A rectangular rod shape and size of TiO 2 (B) particles obtained from Na 2 Ti 3 O 7 is also different from a fibrous structure of TiO 2 (B) prepared using K 2 Ti 4 O 9 . Rutile crystals of 100 nm diameter with a corn-like morphology and large surface area are directly obtained when the hydrolysis of Na 2 Ti 3 O 7 is carried out at 100 °C in a strong acid solution. The structure of starting titanates and the hydrolysis conditions are an important factor to decide the particle size and morphology of TiO 2 (B) and TiO 2 .
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