10.1021/jp711797a.s001 Tai-Hua Xie Tai-Hua Xie Xiaoyan Sun Xiaoyan Sun Jun Lin Jun Lin Enhanced Photocatalytic Degradation of RhB Driven by Visible Light-Induced MMCT of Ti(IV)−O−Fe(II) Formed in Fe-Doped SrTiO<sub>3</sub> American Chemical Society 2008 Enhanced Photocatalytic Degradation SrTiO 3 linkage MMCT TiIV 2008-07-03 00:00:00 Journal contribution https://acs.figshare.com/articles/journal_contribution/Enhanced_Photocatalytic_Degradation_of_RhB_Driven_by_Visible_Light_Induced_MMCT_of_Ti_IV_O_Fe_II_Formed_in_Fe_Doped_SrTiO_sub_3_sub_/2929897 It is important to reveal the origin of the visible light-induced photocatalytic activity of transition metal-doped SrTiO<sub>3</sub> in which an isolated energy level is created by the dopant in the forbidden band gap. In this particle, the photocatalytic and photophysical properties of pure SrTiO<sub>3</sub> and Fe-doped SrTiO<sub>3</sub> were investigated comparatively. The Fe-doped SrTiO<sub>3</sub> has been shown to have a much higher photocatalytic activity than pure SrTiO<sub>3</sub> for the degradation of RhB under visible light irradiation. It was showed that doping Fe into SrTiO<sub>3</sub> exhibited an absorption extending up to the visible region in the optical absorption spectrum and established the Ti<sup>IV</sup>−O−Fe<sup>II</sup> heterobimetallic linkages in the host. Difference diffuse reflectance spectra revealed that the absorption in the visible region is partly attributed to the metal-to-metal charge-transfer (MMCT) excitation of Ti<sup>IV</sup>−O−Fe<sup>II</sup> linkage formed in the Fe-doped SrTiO<sub>3</sub>. The visible light excitation of Ti<sup>IV</sup>−O−Fe<sup>II</sup> linkage was demonstrated to be the cause of the enhanced degradation of RhB. Furthermore, it was noted that the Ti<sup>IV</sup>−O−Fe<sup>II</sup> linkages only onto and nearest the surface of the Fe-doped SrTiO<sub>3</sub> behavior as active sites for the visible light-induced photocatalysis.