Journal
JOURNAL OF HAZARDOUS MATERIALS
Volume 239, Issue -, Pages 118-127Publisher
ELSEVIER
DOI: 10.1016/j.jhazmat.2012.08.016
Keywords
TiO2; Amorphous Al2O3; Photocatalysis; Visible light; Composite
Categories
Funding
- National Natural Science Foundation of China [21076060]
- Key Project of Chinese Ministry of Education [210018]
- One-Hundred Outstanding Innovative Talents Scheme of Hebei Province Education Department [CPRC022]
- Training Funds for Talents Project of Hebei Province
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Nitrogen-doped Degussa P25 TiO2-amorphous Al2O3 composites were prepared via facile solution combustion. The composites were characterised using X-ray diffraction, high-resolution transmission microscopy, scanning electron microscopy, nitrogen adsorption-desorption measurements. X-ray photoelectron spectroscopy. UV-vis light-diffusion reflectance spectrometry (DRS), zeta-potential measurements, and photoluminescence spectroscopy. The DRS results showed that TiO2 and amorphous Al2O3 exhibited absorption in the UV region. However, the Al2O3/TiO2 composite exhibited visible-light absorption, which was attributed to N-doping during high-temperature combustion and to alterations in the electronic structure of Ti species induced by the addition of Al. The optimal molar ratio of TiO2 to Al2O3 was 1.5:1, and this composite exhibited a large specific surface area of 152 m(2)/g, surface positive charges, and enhanced photocatalytic activity. These characteristics enhanced the degradation rate of anionic methylene orange, which was 43.6 times greater than that of pure P25 TiO2. The high visiblelight photocatalytic activity was attributed to synthetic effects between amorphous Al2O3 and TiO2, low recombination efficiency of photo-excited electrons and holes, N-doping, and a large specific surface area. Experiments that involved radical scavengers indicated that (OH)-O-center dot and O-2(center dot-) were the main reactive species. A potential photocatalytic mechanism was also proposed. (C) 2012 Elsevier B.V. All rights reserved.
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