Publication Date:
2015-08-14
Description:
Ti 3+ -doped TiO 2 nanosheets with tunable phase composition (doped TiO 2 (A/R)) were synthesized via a hydrothermal method with high surface area anatase TiO 2 nanosheets TiO 2 (A) as a substrate, structure directing agent, and inhibitor; the activity was evaluated using a probe reaction-photocatalytic CO 2 conversion to methane under visible light irradiation with H 2 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 3+ and single-electron-trapped oxygen vacancy in the doped TiO 2 (A/R) photocatalyst were revealed byelectron paramagnetic resonance (EPR) measurements. Effects of hydrothermal synthesis temperature and the amount of added anatase TiO 2 on the photocatalytic activity were elucidated. Significantly enhanced photocatalytic activity of doped TiO 2 (A/R) was observed; under the optimized synthesis conditions, CH 4 generation rate of doped TiO 2 (A/R) was 2.3 times that of Ti 3+ -doped rutile TiO 2 .
Print ISSN:
2095-0179
Electronic ISSN:
2095-0187
Topics:
Chemistry and Pharmacology
,
Process Engineering, Biotechnology, Nutrition Technology
