Since the properties of the TiO2 powder are influenced mainly by synthesis and processing methods, various synthesis methods of TiO2 powders such as sol-gel, hydrothermal and hydrolysis of inorganic salt have been proposed with the aim to obtain the suitable TiO2 which yield good photocatalytic activity. In this work, TiO2 solutions were prepared using titanium halide as precursor via precipitation method and adjusted pH with ammonium solution. Then the solution was calcined at various temperature to obtain TiO2 nanopowder and investigated the effect of pH on crystal structure, morphology and photocatalytic activity of the synthesized TiO2. Crystal structure and phase transformation of the prepared samples were studied by XRD technique. Morphology and crystallite size of the TiO2 powders were investigated using SEM and TEM. Photocatalytic activity of TiO2 was evaluated by investigating degradation of methylene blue after UV irradiation. Degradation of the solution was then determined by measuring absorbance of the methylene blue of each decanted solution using UV-VIS spectrophotometer. We expected that different synthetic conditions such as different pH, different calcination temperature would result in different crystal phase, crystallite size and especially in photocatalytic activity of TiO2. Results showed that with increasing calcination temperature, the crystallite size was increased. Comparing crystal structures obtained from different pH values in synthesis, at same calcination temperature, the lower pH values resulted in anatase and rutile phases while the higher pH values showed only anatase phase. An affect of such properties on the photocatalytic activity of synthesized TiO2 will be presented.

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