Ti O2 nanoparticles with a mixture of brookite and rutile phases were prepared from aqueous TiOCl2 solution at 80–150°C and pure rutile phase at 200°C. The volume fraction of brookite was gradually increased with increase of HCl concentration in the range of about 4.43 M to 6.28 M. The maximum volume fraction of brookite in the as-prepared TiO2 particles was obtained when oxidation of Ti4+ to TiO2 was completed but it was gradually decreased with increase of reaction time. The reaction time for complete oxidation of Ti4 + to TiO2 was about 15 h at 80°C, about 5 h at 100°C, about 2 h at 120°C, and about 1 h at 150°C, respectively, showing that the kinetics of oxidation is very dependent on the reaction temperature. Brookite phase was not transformed directly to rutile phase but to anatase phase by heat-treatment at about 750°C, which finally converted to rutile phase at 1100°C.
Rutile Anatase Phase Rutile Phase Select Area Diffraction Pattern Brookite
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