Synthesis and photocatlytic performance of nano-sized TiO2 materials prepared by dealloying Ti-Cu-Pd amorphous alloys

TiO2 nanospindles with exposed (0 0 1) facet were synthesized through a simple dealloying reaction. The rutile photocatalysts were characterized by X-ray diffraction, scanning electron microscope and transmission electron microscope, inductively coupled plasma optical emission spectrometry and ultraviolet-visible spectrophotometer. A Rhodamine B dye (RhB) was used to detect the photocatalytic activity of TiO2 under full light irradiation. The presence of Pd in the original amorphous alloy reduced the surface free energy of TiO2, stabilized the (0 0 1) facet. The Pd8-TiO2 sample exhibited the largest crystal size along the direction which is perpendicular to the (0 0 1) facet. The photocatalytic degradation rate of RhB was improved due to the Pd addition in the original amorphous alloy. This indicated that the exposure of (0 0 1) facets could enhance the activity of TiO2 photocatalyst. In addition, the presence of isolated Pd atoms on the surface of TiO2 would be another probable reason for the improvement of photocatalytic activity. (C) 2015 Elsevier Ltd. All rights reserved.