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Preparation and characterization of a novel activated carbon‐supported N‐doped visible light response photocatalyst (TiO 2− x N y /AC)
Author(s) -
Liu Shouxin,
Chen Xiaoyun
Publication year - 2007
Publication title -
journal of chemical technology and biotechnology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.64
H-Index - 117
eISSN - 1097-4660
pISSN - 0268-2575
DOI - 10.1002/jctb.1688
Subject(s) - photocatalysis , calcination , materials science , diffuse reflectance infrared fourier transform , aqueous solution , fourier transform infrared spectroscopy , band gap , nuclear chemistry , visible spectrum , doping , infrared spectroscopy , spectroscopy , scanning electron microscope , analytical chemistry (journal) , catalysis , chemistry , chemical engineering , organic chemistry , physics , optoelectronics , quantum mechanics , engineering , composite material
A photocatalyst, TiO 2−x N y /AC (activated carbon (AC) supported N‐doped TiO 2 ), highly active in both the Vis and UV range, was prepared by calcination of the TiO 2 precursor prepared by acid‐catalyzed hydrolysis in an ammonia atmosphere. The powders were characterized by diffuse reflectance spectroscopy, scanning electron microscopy, X‐ray diffraction, N 2 adsorption, Fourier transform infrared spectroscopy and phenol degradation. The doped N in the TiO 2 crystal lattice creates an electron‐occupied intra‐band gap allowing electron‐hole pair generation under Vis irradiation (500–560 nm). The TiO 2− x N y /AC exhibited high levels of activity and the same activity trends for phenol degradation under both Vis and UV irradiation: TiO 2−x N y /AC calcined at 500 °C for 4 h exhibited the highest activity. The band‐gap level newly formed by doped N can act as a center for the photo‐generated holes and is beneficial for the UV activity enhancement. The performance of the prepared TiO 2− x N y /AC photocatalyst revealed its practical potential in the field of solar photocatalytic degradation of aqueous contaminants. Copyright © 2007 Society of Chemical Industry