Photocatalysis has been applied to decompose the waste and toxic materials produced in daily life and in the global environment. Pure TiO 2 (Zn-TiO 2 -0) and Zn-doped TiO 2 (Zn-TiO 2 -x, x = 3-10 mol %) samples were synthesized using a novel sol-gel and ammonia-evaporation method. The Zn-doped TiO 2 samples showed high photocatalytic activity for the degradation of methylene blue (MB). The physicochemical properties of the samples were investigated using XRD, SEM, ICP, DLS and BET methods. In

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... dition, the most important measurement of photocatalytic ability was investigated by a UV-vis spectrophotometer. The effects of the mol % of zinc ion doping in TiO 2 on photocatalytic activity were studied. Among the mol % Zn ions investigated, the Zn-TiO 2 -9 sample showed the highest photoreactivity. This sample removed 91.4% of the MB after 4 h, while the pure TiO 2 only removed 46.4% of the MB.