Preparation and characterization of Fe-doped TiO2 powders for solar light response and photocatalytic applications

Abstract

Different amounts of Fe-doped TiO2 (with 0.1 to 10 wt.% Fe) powders were prepared at temperatures in the range of 400 and 800?C following a conventional co-precipitation technique and were thoroughly characterized by means of X-ray diffraction (XRD), Fourier-transform infrared (FT-IR), Fourier-transform Raman (FT-Raman), diffuse reflectance spectroscopy (DRS), BET surface area, zeta potential and flat band potential measurements. Photocatalytic ability of Fe-doped TiO2 powders was evaluated by means of methylene blue (MB) degradation experiments conducted under the irradiation of simulated solar light. Characterization results suggested that as a dopant Fe stabilized TiO2 in the form of anatase phase, reduced its band gap energy and adjusted its flat band potentials in such a way that these powders can be employed for photoelectrolysis of water into hydrogen and oxygen in photoelectrochemical (PEC) cells. The 0.1 wt.% Fe-doped TiO2 exhibited highest activity in the photocatalytic degradation of MB. The kinetic studies revealed that the MB degradation reaction follows the Langmuir-Hinshelwood first order reaction rate.

Influence of annealing on Fe-doped TiO2 powders using co-precipitation technique

“…Therefore, in these nanopowders the rutile structures are dominant compared to the anatase structures in terms of their intensity. These results are quite different compared to the previous studies, where they were observed the transformation phase structures from rutile crystal structure to anatase crystal structure after annealing at 800 o C [8]. Also, another previous study showed that TiO2:Fe was in rutile structures.…”

Influence of Fe³⁺ Ion Substitution on Thermal and Dielectric Properties of Titanium Dioxide

“…FT-IR spectra reveal some weak transmittance bands between 1020 to 1650 cm -1 and 2800 to 3500 cm -1 and it also shows a gradual decrease in peak intensities with increasing Fe concentration. These bands are attributed to the stretching vibration of O-H groups and bending vibration of absorbed water molecules [6]. Further, the bands Between 500 to 830 cm -1 may be due to different vibrational modes of TiO 2 , the broad intense band at 1200 cm -1 may be due to Ti-O-Ti vibration as shown in Fig.…”

Взаимодиффузия и фазообразование в тонкопленочной системе Fe-TiO-=SUB=-2-=/SUB=-

“…Легирование железом частиц TiO 2 приводит к образо-ванию смешанных оксидов или смеси простых и смешан-ных оксидов [10]. Катионы железа Fe 3+ замещают Ti 4+ в катионных позициях, так как имеют близкие ионные ра-диусы Fe 3+ (0.64 ¦ ), Ti 4+ (0.610 ¦ ) и образуют твердые растворы с диоксидом титана при низких концентрациях железа (< 1%).…”