Abstract: Iron ion and chromium ion doped TiO₂ films were prepared on the surface of glazed brick by the sol-gel
process, and the effect of iron ion and chromium ion doping on photocatalytic activities of TiO₂ films was investigated. The results
of photodecomposing Rhodamine B show that an appropriate doping amount of iron and chromium ion can improve the photocatalytic
activities of TiO₂ films, however, the photocatalytic activities of iron ion doped samples are remarkably higher than those of
chromium ion doped samples, while the doping ways of chromium ion affect the photocatalytic activities of TiO₂ films, because of their different
doping mechanisms.

Key words: titania, doping, photocatalytic activities