A facile synthesis of nanocrystalline anatase TiO2 from TiOSO4 aqueous solution

• Anatase TiO2 is prepared from thermal hydrolysis of TiOSO4 aqueous solution without calcination.
• Anatase TiO2 shows high stability as the transformation to rutile occurs at 900 °C.

A green and simple synthetic route via a thermal hydrolysis of titanyl sulphate (TiOSO4) has been employed to prepare nanocrystalline anatase titanium dioxide (TiO2) without further calcination. X-ray diffraction (XRD) clearly showed that the anatase crystalline structure was already formed under the reaction conditions at 80.0±2.0 °C. The obtained anatase TiO2 showed high thermal stability as the anatase-to-rutile transformation in only 25 wt% occurred at 900 °C. Scanning electron (SEM) and transmission electron (TEM) micrographs revealed that TiO2 secondary particles comprised irregular primary particles with diameters of 8–22 nm depending on the calcination temperature. Superior UV-light absorption intensity compared with the commercial P25 TiO2suggested the great potential of the obtained material for use as a highly efficient photocatalyst under UV irradiation.