Fabrication and Photocatalytic Property of One-Dimensional SrTiO 3 / TiO 2 - x N x Nanostructures

One-dimensional SrTiO 3 /TiO 2− x N x nanostructures were prepared by the hydrothermal method and investigated by X-ray diffraction (XRD), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), and ultraviolet-visible diffuse reflectance spectroscopy (UV-vis DRS) measurements. The photocatalytic activities of the prepared samples were evaluated by photodegrading the methylene blue (MB) solution. According to the characterizations, the intermediate product of SrTiO 3 /titanate nanotubes was presented after hydrothermal processing of the TiO 2− x N x nanoparticles with the mixed solution of NaOH and Sr(NO 3 ) 2 . The final product of SrTiO 3 /TiO 2− x N x nanorods was obtained after calcining the intermediate. As compared to the TiO 2− x N x nanoparticles, the absorption performance of SrTiO 3 /titanate nanotubes or SrTiO 3 /TiO 2− x N x nanorods was depressed, instead of improving it. The mechanisms of the absorption property changes were discussed. The SrTiO 3 /TiO 2− x N x nanorods presented better photocatalytic activity than the TiO 2− x N x nanoparticles or nanorods. However, due to overmuch adsorption, the SrTiO 3 /titanate nanotubes gave ordinary photocatalytic performances.