One-step synthesis of Fe–N–S-tri-doped TiO{sub 2} catalyst and its enhanced visible light photocatalytic activity
- Department of Environmental Science and Engineering, Heilongjiang University, Xuefu Road 74, Nangang District, Harbin 150080 (China)
Graphical abstract: FeNS-TiO{sub 2} exhibits stronger SPS response than that of pure TiO{sub 2}, indicating that the FeNS-TiO{sub 2} should have a higher separation rates of photoinduced charge carriers. Further, for the sample FeNS-TiO{sub 2} a broad shoulder SPS response can be seen at the wavelength range from 390 to 550 nm, suggesting that the light absorption in visible region of FeNS-TiO{sub 2} was greatly improved, which is beneficial to the enhancement of photocatalytic activity. Display Omitted Highlights: ► FeNS-TiO{sub 2} catalyst has been synthesized in the presence of ammonium ferrous sulfate. ► The light absorption edge of FeNS-TiO{sub 2} catalyst was red-shifted to visible region. ► The separation efficiency of photoinduced charge carriers of FeNS-TiO{sub 2} was improved. ► The activity enhanced mechanism of FeNS-TiO{sub 2} was discussed in detail. -- Abstract: Fe–N–S-tridoped TiO{sub 2} was synthesized through simple one step sol–gel reactions in the presence of ammonium ferrous sulfate. The resulting materials were characterized by X-ray diffraction, transmission electron microscopy, X-ray photoelectron spectroscopy, diffuse reflectance spectrum and surface photovoltage spectroscopy. Results revealed that Fe and S were incorporated into the lattice of TiO{sub 2} by substituting for some Ti atoms and N for O atoms in the lattice of TiO{sub 2}. Tri-doping with Fe, N and S could inhibit the phase transformation of TiO{sub 2} from anatase to rutile, restrain the growth of crystallite sizes, extended the light absorption into the visible region and separate photoinduced charge carriers. The visible photocatalytic activity of Fe–N–S-tridoped TiO{sub 2} was higher than that of N-TiO{sub 2} and P25 TiO{sub 2}. The enhanced photocatalytic activity was attributed to the small crystallite size, high crystallinity, the intense light absorption in visible region, narrow band gap and high separation efficiency of photoinduced charge carriers.
- OSTI ID:
- 22215623
- Journal Information:
- Materials Research Bulletin, Vol. 47, Issue 11; Other Information: Copyright (c) 2012 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); ISSN 0025-5408
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
77 NANOSCIENCE AND NANOTECHNOLOGY
ABSORPTION
CATALYSTS
CHARGE CARRIERS
DOPED MATERIALS
EFFICIENCY
IRON NITRIDES
NANOSTRUCTURES
OPTICAL PROPERTIES
PHASE TRANSFORMATIONS
PHOTOCATALYSIS
RUTILE
SULFATES
SYNTHESIS
TITANIUM OXIDES
TRANSMISSION ELECTRON MICROSCOPY
X-RAY DIFFRACTION
X-RAY PHOTOELECTRON SPECTROSCOPY