Abstract

In this study, TiO₂ was synthesized by refluxing gel TiO₂ in H₂O₂ solution. Experiments were carried to investigate effects of the acidity of the reactions, refluxing time, quantity of H₂O₂, and the drying condition to the formation and photocatalytic activities of products. Samples were characterized by XRD, BET, IR, and DRS. Adsorption and phototcatalytic properties of samples were studied by the degradation of methylene blue (MB) under visible light. Results showed that TiO₂ was crystallized only from the refluxing baths that were not adjusted their acidity after mixing TiO₂ sol with H₂O₂ solution. Increasing the refluxing time or drying products at 100 ^oC led to decreasing photocatalytic activities of TiO₂. Increasing the amount of H₂O₂ in the refluxed solutions, photocatalytic activities of TiO₂ increased to a maximum level when 25 mL of H₂O₂ was used.