TiO_2 nanoparticles, with different amounts of Fe~(3+)-doped, were synthesized using an acid-catalyzed sol-gel method and characterized by XRD, TEM, and UV-vis techniques. The results show that the absorption of Fe~(3+)/TiO_2 nanoparticles were largely red-shifted and the absorption intensities increased with increasing amounts of Fe~(3+) . The transition temperature of TiO_2 from anatase to rutile was lowered and the crystal phase of ferric oxide was not observed and the activities of TiO_2 nanophotocatalysts were enhanced due to the addition of Fe~(3+) into TiO_2.

Key words: IRON, TITANIUM DIOXIDE, NANOPHASE MATERIALS, SOL-GEL PROCESS, XRD, TEM, UV, CATALYTIC ACTIVITY