Highly Active Rutile TiO2 for Photocatalysis under Violet Light Irradiation at 405 nm

Anatase TiO2 is a widely investigated photocatalyst; however, it can only work under ultraviolet (UV) light with wavelengths less than 390 nm (band gap 3.2 eV). Rutile absorb visible at 410 3.0 eV); its photocatalytic activity not high. Herein, we activated rutile TiO2, which was prepared from Evonik P 25 through calcination 800 °C using hydrogen reduction treatment 700 °C. The of the hydrogen-treated as high UV irradiation 380 nm, significantly higher violet 405 for oxidative decomposition acetic acid in water. Electron spin resonance studies indicate that charge separation enhanced reduced and their oxygen pathways differ between anatase rutile. formation H2O2 observed on TiO2; consumed during photocatalysis to accelerate decomposition.