Effect of SO42- on microstructure, phase and photocatalytic activity of TiO2 nanomaterials prepared from Ti-Cu amorphous alloy

摘要

TiO2 nanomaterials have many promising applications in environmental and energy areas due to their advantages of physical and chemical stability, high activity, non-toxicity and low price. In the present paper, the hierarchical TiO2 nanomaterials with thickness.10 mm were synthesised using Ti-Cu amorphous alloy as the starting material. The field emission scanning electron microscopy, X-ray diffraction and transmission electron microscopy were used to characterise the morphology and structure of the TiO2 nanomaterials. The hierarchical TiO2 nanomaterials exhibited high specific areas of >100 m(2) g(-1). The phase composition of TiO2 was controlled by adjusting the concentration of SO42- in the immersing solution. The influence mechanism of SO42- on phase composition of TiO2 nanomaterials was discussed. The mixed phase of anatase and rutile had higher photocatalytic efficiency than single phase in degradation of rhodamine B under visible light. The hierarchical TiO2 nanomaterials had potential applications in photocatalyst and solar cell.