الفهرس | Only 14 pages are availabe for public view |
Abstract Pure TiO2 nanocrystals were prepared using post hydrothermal treatment at 180 oC at different hydrothermal time (0, 6, 12, 24 h) in aqueous nitric acid. Also the 0.01 mol Fe3+ and 0.01 mol Zn2+ doped TiO2 were prepared under the same condition but at 12 h of hydrothermal time. Xray diffraction (XRD), transmission electron microscope (TEM), surface area analysis and UV–visible diffuse reflectance were used to characterize the hydrothermally treated pure and doped TiO2. The TEM results showed that shape of TiO2 nanoparticles could be manipulated by hydrothermal treatment. The increasing of hydrothermal time significantly altered the morphology of TiO2 from aggregated nanospherical shape (T6 h) into nano-leaf and rod like morphologies (T12 h). The combination of doping and hydrothermal treatment for the TiO2 sol leads to hinder the crystal growth and formation of highly aggregated spherical nanoparticle. XRD analysis confirms that all TiO2 samples have anatase phase except T0hsol and ZT12h. Surface and optical properties are remarkably affected by hydrothermal and doping modification. The prepared TiO2 nanomaterials were applied for photocatalytic degradation of textile dye (brilliant black (BB)) and photocatalytic hydrogen production from water splitting. |