Frontiers of Chemical Science and Engineering
>> 2015,
Volume 9,
Issue 3
doi:
10.1007/s11705-015-1523-5
RESEARCH ARTICLE
Facile synthesis and enhanced visible-light photocatalytic activity of Ti
1. Department of Chemical Engineering and Catalysis for Renewable Fuels (CReF) Center, University of South Carolina, Columbia, SC 29208, USA.2. Department of Metallurgical and Chemical Engineering, Jiyuan Vocational and Technical Collage, Jiyuan 459000, China.3. State Key Laboratory for Oxo Synthesis and Selective Oxidation, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China
Accepted: 2015-08-04
Available online: 2015-09-30
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Abstract
Ti -doped TiO nanosheets with tunable phase composition (doped TiO (A/R)) were synthesized via a hydrothermal method with high surface area anatase TiO nanosheets TiO (A) as a substrate, structure directing agent, and inhibitor; the activity was evaluated using a probe reaction-photocatalytic CO conversion to methane under visible light irradiation with H as an electron donor and hydrogen source. High-resolution transmission electron microscope (HRTEM), field emission scanning electron microscope, UV-Vis diffuse reflectance spectra, and X-ray diffraction (XRD) etc., were used to characterize the photocatalysts. XRD and HRTEM measurements confirmed the existence of anatase-rutile phase junction, while Ti and single-electron-trapped oxygen vacancy in the doped TiO (A/R) photocatalyst were revealed byelectron paramagnetic resonance (EPR) measurements. Effects of hydrothermal synthesis temperature and the amount of added anatase TiO on the photocatalytic activity were elucidated. Significantly enhanced photocatalytic activity of doped TiO (A/R) was observed; under the optimized synthesis conditions, CH generation rate of doped TiO (A/R) was 2.3 times that of Ti -doped rutile TiO .
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