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Visible light responsive iodine-doped TiO2 for photocatalytic reduction of CO2 to fuels

Journal Article · · Applied Catalysis. A, General
Iodine-doped titanium oxide (I-TiO2) nanoparticles that are photocatalitically responsive to visible light illumination have been synthesized by hydrothermal method. The structure and properties of I-TiO2 nanocrystals prepared with different iodine doping levels and/or calcination temperatures were characterized by X-ray diffraction, transmission electron microscopy and diffraction, X-ray photoelectron spectroscopy, and UV-vis diffuse reflectance spectra. The three nominal iodine dopant levels (5, 10, 15 wt.%) and the two lower calcination temperatures (375, 450°C) produced mixture of anatase and brookite nanocrystals, with small fraction of rutile found at 550°C. The anatase phase of TiO2 increased in volume fraction with increased calcination temperature and iodine levels. The photocatalytic activities of the I-TiO2 powders were investigated by photocatalytic reduction of CO2 with H2O under visible light (λ > 400 nm) and also under UV-vis illumination. CO was found to be the major photoreduction product using both undoped and doped TiO2. A high CO2 reduction activity was observed for I-TiO2 catalysts (highest CO yield equivalent to 2.4 micro mol g-1 h-1) under visible light, and they also had much higher CO2 photoreduction efficiency than undoped TiO2 under UV-vis irradiation. I-TiO2 calcined at 375°C has superior activity to those calcined at higher temperatures. Optimal doping levels of iodine were identified under visible and UV-vis irradiations, respectively. This is the first study that investigates nonmetal doped TiO2 without other co-catalysts for CO2 photoreduction to fuels under visible light.
Research Organization:
Univ. of Wisconsin, Milwaukee, WI (United States)
Sponsoring Organization:
USDOE SC Office of Basic Energy Sciences (SC-22)
DOE Contract Number:
FG02-06ER46328
OSTI ID:
1051024
Report Number(s):
DOE/ER/46328-5
Journal Information:
Applied Catalysis. A, General, Journal Name: Applied Catalysis. A, General Journal Issue: 1-2 Vol. 400; ISSN 0926-860X
Publisher:
Elsevier
Country of Publication:
United States
Language:
English

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