Preparation and Properties of Activated Carbon Supported Nitrogen Doped Visible-light Response TiO_(2-x)N_y/AC Photocatalysts

An efficient visible-light response composite photocatalyst TiO_(2-x)N_y/AC was prepared by calcination of the mixture of TiO_2 precursor made by acid catalyzed hydrolysis method and actived carbon (AC) in NH_3/N_2 atmosphere.Photocatalytic activity was investigated through the photocat- alytic degradation of phenol.The separability of TON/AC was determined by gravity sedimentation. X-ray photoelectron spectroscope,X-ray diffraction,diffuse reflectance spectroscope,Fourier transform infrared spectroscope,scanning electron microscope and N_2 adsorption isotherm were used for catalyst characterization.The results show that anion N is incorporated into TiO_2 lattice and substitutes part of O.TON/AC with suitable N-doping exhibits high activity under ultraviolet light,visible light and solar light irradiation.Also,TON/AC exhibits better decantability and less deactivation.Doped-N can form a new band gap above the valence band of TiO_2 which can extend the adsorption edge to 450-550nm.In addition,Aetived carbon support is beneficial to the high dispersion and large surface area of N-doped TiO_2.