Preparation of Ni Doped ZnO-TiO₂Composites and Their Enhanced Photocatalytic Activity

Abstract

Herein, Ni doped ZnO-TiO 2 composites were prepared by facile sol-gel approach and were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), UV-visible diffuse reflectance spectroscopy (UV-Vis DRS), X-ray photoelectron spectroscopy (XPS), and photoluminescence spectroscopy (PL). The results indicated that the Ni ions can be incorporated into the lattice of TiO 2 structure and replace Ti. The introduction of Ni expanded light absorption of TiO 2 to visible region, increased amount of surface hydroxyl groups and physically adsorbed oxygen (as the electronic scavenges), and then enhanced separation rate of photogenerated carriers. The photodegradation test of reactive brilliant blue (KN-R) under simulated solar light indicated that Ni doped ZnO-TiO 2 composites have better photocatalytic activities, as compared to those of TiO 2 and ZnO-TiO 2 .