Journal
MICROPOROUS AND MESOPOROUS MATERIALS
Volume 110, Issue 2-3, Pages 397-404Publisher
ELSEVIER
DOI: 10.1016/j.micromeso.2007.06.048
Keywords
mesoporous titania; specific surface area; supercritical drying; nitrogen dope; X-ray photoelectron spectroscopy
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Nitrogen-doped mesoporous titania aerogel photocatalysts were prepared by supercritical drying technique with carbon dioxide (SCCO2) and calcination the urea impregnated TiO2 aerogel at 773 K under NH3 or N-2 + NH(3)aq gaseous atmosphere. The pore properties were investigated from nitrogen adsorption measurement at 77 K. The prepared N-doped TiO2 aerogel had a high specific surface area (116 m(2)/g), a total pore volume (0.33 cm(3)/g) and a sharp pore radius distribution (r(peak) = 4.2 nm). The doping of the nitrogen atom into the TiO2 lattice is expected from X-ray photoelectron spectroscopy (XPS), X-ray powder diffraction (XRD), and U-V-Vis spectroscopy. Nitrogen states in the lattice and crystalline structure were measured using X-ray photoelectron spectroscopy and X-ray diffractometry. The N-doped TiO2 aerogel absorbed well into the visible region up to 600 nm. (C) 2007 Elsevier Inc. All rights reserved.
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