Fe+3-doped TiO2: A combined experimental and computational approach to the evaluation of visible light activity

Fabrication of a Z-Scheme g-C3N4/Fe-TiO2 Photocatalytic Composite with Enhanced Photocatalytic Activity under Visible Light Irradiation

“…The Ti 2p3/2 and Ti 2p1/2 peak positions of the TiO2 sample were 458.55 eV and 464.25 eV, whereas they shifted to a higher binding energy of 458.65 eV and 467.35 eV for the Fe-TiO2 and 0.05Fe-CT samples, respectively. The small shifts of binding energy might be due to the effect of the Fe 3+ in the interstitial and/or substitutional site in the TiO2 crystal lattice and formed the Ti-O-Fe bonds in the crystal lattice [41,42]. Due to the low doping level, the signals of Fe were too weak to be observed (not shown).…”

“…As for the O 1s spectra presented in Figure 6b, two peaks of the binding energy at 529.95 and 532 eV for the 0.05Fe-CT sample were associated with the O2 − in TiO2 and the -OH terminal on the surface [42]. For the 0.05Fe-CT sample, the formation of the new Ti-OFe bonds in the crystal lattice might change the electron densities of Ti 4+ cations and O2 − anions, which caused a slightly higher shift of O 1s peaks compared to those for TiO2 at 529.75 and 531.65 eV, respectively, and which might be a cause for the enhanced photocatalytic activity [42,43]. From the XPS spectra of C 1s in Figure 6c, three peaks centered at 285, 286.2, and 288.9 eV can be observed in all three samples.…”

Effect of Fe Concentration on Fe-Doped Anatase TiO2from GGA +UCalculations

“…In addition, the Fe 3+ dopant can serve as a charge trap, impeding the electronhole combination rate and enhancing photocatalysis within a range suitable to the concentration of the dopant [17]. Fe is considered an appropriate candidate element and has been widely studied [18][19][20][21][22][23][24][25]. Zhang et al [18] [20,21] have found that Fe doping in TiO 2 could narrow the band gap of TiO 2 , thereby increasing the efficiency of the photocatalysis in the visible range.…”

PREPARATION AND CHARACTERIZATION OF Cu-Fe/TiO2 PHOTOCATALYST FOR VISIBLE LIGHT DEEP DESULFURIZATION

“…The blue shift in the absorption of photocatalysts suggested that the dopants successfully generate lower energy level between the valence and conduction bands [45]. The estimated band gap energy of metal doped TiO 2 was lower compared to that of TiO 2 P25 (3.2 eV) [46]. Decreasing band gap energy increases the absorbance in the visible region and indicates that the electron-hole pairs can be generated with metal doping on the TiO 2 , which can be attributed to the charge transfer between metal ions and TiO 2 [34].…”