Nano-sized TiO2 samples were successfully synthesized by both methods: sol-gel and hydrothermal treatment. The
samples were characterized by XRD and FESEM, TEM. The XRD results revealed TiO2 samples consisted of pure
anatase phase and/or mixture of anatase-rutile phases depending on the synthesis condition. By SEM-TEM, the particle
size of all TiO2 samples was ca. 20-50nm. Nanosized TiO2 samples were tested in the photocatalytic oxidation of redphenol
and in the photocatalytic reduction of Cr(VI) to Cr(III). All samples were active in both reactions, however, a
difference in photocatalytic activities between samples was observed. For comparison, P25 Degussa was also
investigated. Photocatalytic performances of the samples were discussed.
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