Degradation of propanol diluted in water under visible light irradiation using metal ion-implanted titanium dioxide photocatalysts

Abstract

The metal ion-implantation of titanium dioxide (TiO 2) with metal ions (V +, Mn +, Fe +) at high energy acceleration and the subsequent calcination of these metal ion-implanted TiO 2 in oxygen at around 725 K resulted in a definite shift in the absorption spectra toward visible light regions. These catalysts exhibited photocatalytic reactivity for degradation of 2-propanol diluted in water under visible light irradiation ( λ>450 nm). XAFS studies have revealed that the implanted metal ions are located at the lattice positions of Ti 4+ in TiO 2 after the calcination. These spectroscopic studies show that the substitution of Ti ions in TiO 2 lattice with implanted metal ions is important to modify TiO 2 to be able to adsorb visible light and operate as photocatalysts under visible light irradiation.