پديدآورندگان :
Sadat Larimi Afsaneh - Department of Process and Chemistry, Niroo Research Institute, Tehran, Iran , Madanipour Maryam - Department of Process and Chemistry, Niroo Research Institute, Tehran, Iran , Ghahraman Afshar Majid mghahramanafshar@nri.ac.ir Department of Process and Chemistry, Niroo Research Institute, Tehran, Iran;
چكيده فارسي :
Nano-sized metallic copper could be a replacement of noble metals for improving photoactivity of TiO2-based photocatalysts. To this end, anatase TiO2 doped with Cu employing hydrothermal method. Afterward, photoactivity of the samples measured by the photoreduction of CO2 with H2O vapor under visible-light irradiation. Physicochemical properties of samples were investigated by X-ray diffraction, transmission electron microscopy, N2 physisorption and diffuse reflectance spectrometery analysis. The improved photoactivity is attributed to the embedded metallic Cu, which promotes the formation of oxygen vacancies in TiO2 through the metal-oxide interaction, thus increasing the visible-light absorption of Cu-TiO2 and the adsorption of CO2 on their surface. Furthermore, the metallic Cu increases photo-induced charge-separation of TiO2 through trapping electrons as evidenced by transient photo-current measurements. The present work sheds light on developing new type of metal-oxide based visible-light-driven photocatalysts.
