Synthesis of Peroxo-Titania with Enhanced Photocatalytic Activity and Stability Under Visible Light

Abstract

The peroxo-titania was prepared by H₂O₂ modification in situ. X-Ray diffraction, N₂ adsorption, UV-visible spectroscopy, FT-IR spectroscopy and X-ray photoelectron spectroscopy were used to characterize the prepared TiO₂ samples. The results indicated that the band gap did not decrease by modification, but formed surface complexes which could absorb visible light. The thermal decomposition of peroxo titanate complex cause the generation of oxygen in situ, which can hinder the oxygen vacancy formation and retains the strength of Ti-O-Ti network, thus stabilize the anatase phase and slow crystallite growth at high temperature. The obtained catalyst exhibited outstanding photocatalytic activity and stability under visible light. The possible mechanism was proposed.