Formation behavior and photo-oxidation abilities of nanostructured TiO 2 powders were investigated through a direct crystallization from aqueous TiOCl 2 solutions containing various metal chlorides at 100 • C. The obtained TiO 2 powders without any additives and those with Ni 2+ , Fe 3+ and Nb 5+ ions added, which have a similar positive ionic radius to Ti 4+ , were mainly crystallized with rutile phase, whereas those with Al 3+ and Zr 4+ ions added, which have a quite different positive ionic radius, were mainly crystallized with anatase phase. On the other hand, the secondary particles in the TiO 2 powder consisted of acicular and spherical primary particles, corresponding to rutile and anatase phases, respectively. From these results, it seems that the positive ionic radius of the additives would affect phase formation as well as morphology of TiO 2 precipitates. Among the TiO 2 powders prepared, Ni-added powder, which consisted mainly of rutile phase with a small amount of anatase phase, showed excellent photocatalytic ability in decomposition of 4-chlorophenol.
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