title: N-TiO2/gamma-Al2O3 granules: preparation, characterization and photocatalytic activity for the degradation of 2,4-dichlorophenol.
abstract: Nitrogen doping TiO2 and gamma-Al2O3 composite oxide granules (N-TiO2/gamma-Al2O3) were prepared by co-precipitation/oil-drop/calcination in gaseous NH3 process using titanium sulphate and aluminum nitrate as raw materials. After calcination at 550 degrees C in NH3 atmosphere, the composite granules showed anatase TiO2 and gamma-Al2O3 phases with the granularity of 0.5-1.0 mm. The anatase crystallite size of composite granules was range from 3.5-25 nm calculated from XRD result. The UV-Vis spectra and N 1s XPS spectra indicated that N atoms were incorporated into the TiO2 crystal lattice. The product granules could be used as a photocatalyst in moving bed reactor, and was demonstrated a higher visible-light photocatalytic activity for 2,4-dichlorophenol degradation compared with commercial P25 TiO2. When the mole ratio of TiO2 to Al2O3 equal to 1.0 showed the highest catalytic activity, the degradation percentage of 2,4-chlorophenol could be up to 92.5%, under 60 W fluorescent light irradiation for 9 hours. The high visible-light photocatalytic activity might be a synergetic effect of nitrogen doping and the form of binary metal oxide of TiO2 and gamma-Al2O3.
authors: Collage of Environment Science and Chemical Engineering, Nanchang University, Nanchang, 330031, China.
authors: Donggen
authors: D
authors: Huang
authors: Wenfa
authors: W
authors: Xie
authors: Zhibin
authors: Z
authors: Tu
authors: Feng
authors: F
authors: Zhang
authors: Shuiqing
authors: S
authors: Quan
authors: Lei
authors: L
authors: Liu
mesh_terms: D000537:Aluminum Oxide / Q000737:chemistry* / Q000528:radiation effects*; D002384:Catalysis; D002733:Chlorophenols / Q000737:chemistry* / Q000528:radiation effects*; D008027:Light; D008422:Materials Testing; D049329:Nanostructures / Q000737:chemistry* / Q000528:radiation effects / Q000648:ultrastructure; D014025:Titanium / Q000737:chemistry* / Q000528:radiation effects*
chemical_list: D002733:Chlorophenols; C009495:titanium dioxide; D014025:Titanium; D000537:Aluminum Oxide; C004762:2,4-dichlorophenol