Journal
APPLIED SURFACE SCIENCE
Volume 263, Issue -, Pages 260-265Publisher
ELSEVIER
DOI: 10.1016/j.apsusc.2012.09.040
Keywords
Anatase; Rutile; Fe-doping; Sol-gel; Photocatalysis; Optical spectroscopy
Categories
Funding
- Foundation of National Key Basic Research and Development Program [2010CB631001]
- National Nature Science Foundation [50871046]
- Program for Changjiang Scholars and Innovative Research Team in University
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Anatase and rutile TiO2 composite nanopowders with different Fe-doped concentrations were synthesized by sol-gel technique. X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) were used to detect the crystalline structure and chemical state of the nanopowders. The photocatalytic activity was estimated by the degradation of 20 mg/L methyl orange under an irradiation of 350-450nm light source. TiO2 powder with 28.76 wt% rutile showed the highest degradation among the TiO2 composite powders, but the 1.0 at% Fe-doping TiO2 with 20.64 wt% rutile phase exhibited an even higher degradation than that without Fe doping. Doping of Fe in TiO2 composite powder induced an evident increase in absorption peak and a significant red-shift in absorption edge from 420nm to 460nm in UV-vis absorption spectrum, and these characteristics are responsible for the improvement of photocatalytic activity. (C) 2012 Elsevier B. V. All rights reserved.
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