3? Keywords Brookite titanium dioxide Fe Modiﬁed Photocatatlytic Introduction TiO semiconductor material is a popular photocatalyst due to its nontoxic, stable and low-cost properties [1–5]. However, it has a wide band-gap of 3.2 eV, indicating that it only can absorb ultraviolet light energy (ca. 4 % of the solar spectrum) [6–9]. Recently, numerous efforts have been devoted to improve the visible light photocatalytic activity of TiO by doping with various elements [10–17]. This strategy could introduce structural defects into TiO , and shift the absorption edge from the ultraviolet light region to the visible light region, which can effectively enhance the visible light photocatalytic activity. It is noteworthy, that doped with transition metal ions could narrow the TiO band gap, and induce a red shift of the TiO absorption spectrum. However, the introduced doping energy level will easily generate recombination centers, which could reduce the ultraviolet photocatalytic activity, especially metal ions doping. 3? In comparison with other transition metal ions, Fe has a special semi-full 4? 3? electronic structure, and its ion radius is closed to Ti , thus Fe is an ideal dopant 3? of TiO [18, 19]. There have been much work reported about
Research on Chemical Intermediates – Springer Journals
Published: Sep 26, 2016
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