Undoped visible-light-sensitive titania photocatalyst

作者：Kako Tetsuya^*; Umezawa Naoto; Xie Kui; Ye Jinhua

来源：Journal of Materials Science, 2013, 48(1): 108-114.

DOI：10.1007/s10853-012-6888-y

Colorful rutile TiO2 was prepared by heating Ti2O3 at 550-900 A degrees C to develop novel visible-light-sensitive and eco-friendly photocatalysts for environmental remediation under visible-light irradiation. The colors of the prepared samples, which ranged from grayish green to yellowish off-white via yellow differed from the reported colors of reduced TiO2, such as blue and black. The TiO2 prepared in this study was characterized by X-ray diffraction, Raman spectroscopy, X-ray photoelectron spectroscopy, and UV-Visible spectroscopy. These measurements showed that the TiO2 contained Ti3+-interstitial sites. The TiO2 was sensitive to visible light, and calculation of the band diagram demonstrated that this visible-light absorption is caused mainly by formation of Ti3+-interstitial sites in rutile TiO2. Among the prepared samples, the TiO2 prepared by heating Ti2O3 at 700 A degrees C shows the highest photocatalytic activity under visible-light irradiation. In addition, the sample was further and mildly ground using a bead-milling machine. The ground sample possessed higher surface area and better photocatalytic activity.

• 出版日期2013-1