Highly thermally stable anatase TiO2 whisker has been synthesized by ion-exchange and calcination at high temperature (800°C) using K2Ti2O5 as the precursor. Pt nanoparticles (1%) were loaded on this TiO2 to prepare a Pt/TiO2 catalyst by the glycol-colloidal method. The catalyst samples were characterized by X-ray diffraction, scanning electron microscopy, transmission electron microscopy, X-ray fluorescence, and N2 adsorption-desorption measurements. Photocatalytic performance of the Pt/TiO2 catalyst was measured by phenol degradation. The catalytic activity of Pt/TiO2 was 2.3 times that of TiO2 whisker, and the activity on per unit surface area was high. The Pt/TiO2 catalyst was stable after reuse 10 times, and it maintained 91% of its initial activity because the loss of Pt was only 6%.
- Titanium dioxide