Journal
JOURNAL OF SOLID STATE CHEMISTRY
Volume 184, Issue 1, Pages 134-140Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jssc.2010.10.039
Keywords
Boron and nitrogen codoped titania; Surface structure; X-ray photoelectron spectroscopy; Photocatalysis; Electron paramagnetic resonance
Funding
- National Natural Science Foundation of China [20873044]
- New Century Excellent Talents in University [NCET-08-0205]
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B,N-TiO2 photocatalysts were synthesized by boron doping firstly and subsequently nitrogen doping in NH3 at variable temperatures. The effects of the nitrogen doping temperature on the structure and photocatalytic activity of the B,N-codoped TiO2 were investigated. The as-prepared samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), UV-vis diffuse reflectance spectrum (DRS), electron paramagnetic resonance (EPR) and X-ray photoelectron spectroscopy (XPS). The photocatalytic activity was evaluated with photocatalytic degradation of methyl orange dye (MO) under visible light and UV-visible light irradiation. The results suggested that the boron and nitrogen can be incorporated into the TiO2 lattice either interstitially or substitutionally or both, while the Ti-O-B-N structure plays a vital role in photocatalytic activity in visible light region. The optimal nitrogen doping temperature is 550 degrees C. Higher temperature may form many oxygen vacancies and Ti3+ species, resulting in the decrease of photocatalytic activity in visible light. (C) 2010 Elsevier Inc. All rights reserved.
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