Preparation and characterization of a novel activated carbon-supported N-doped visible light response photocatalyst (TiO2−xNy/AC)
✍ Scribed by Shouxin Liu; Xiaoyun Chen
- Publisher
- Wiley (John Wiley & Sons)
- Year
- 2007
- Tongue
- English
- Weight
- 427 KB
- Volume
- 82
- Category
- Article
- ISSN
- 0268-2575
No coin nor oath required. For personal study only.
✦ Synopsis
Abstract
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