Preparation and Characterization of N, S Co-doped TiO2 Nanopowder and its Photocatalytic Activity under Visible Light

Abstract

N, S co-doped TiO₂ was prepared via a hydrothermal process. X-ray diffraction, UV-VIS spectroscopy and X-ray photoelectron spectroscopy were conducted to characterize the prepared TiO₂ particles. The results indicated that N and S doped into the TiO₂ crystal lattice simultaneously by hydrothermal process. The photocatalytic performance in the degradation of methylene blue indicated that N and S doped TiO₂ showed much higher photocatalytic activity than pure TiO₂ under visible light. Co-doping sample exhibited the highest activity. This is probably due to the synergistic effect of reduced particle size, optimal anatase/rutile ratio, reduced electron-hole recombination rate and more absorption in visible light region.