Synthesis and Antimicrobial Activity of Fe:TiO₂ Particles

Abstract

TiO2 and iron-doped TiO2 were synthesized by sol-gel method. TiO2 and 0.5 %mol Fe:TiO2 were calcined at 500 and 800 °C for 3 h. The synthesized particles were characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), UV-VIS diffuse reflectance spectrophotometry (UV/DRS), scanning electron microscopy (SEM) and scanning electron microscope-energy dispersive X-Ray analysis (SEM-EDX). The XRD patterns of all samples that were calcined at 500 °C showed only anatase phase. On increasing temperature from 500 to 800 °C, the anatase phase transformed to rutile phase. For 0.5 %mol Fe:TiO2, pseudobrookite (Fe2TiO5) phase was observed at 800 °C. The particles that contained rutile showed higher antibacterial activities against E.coli, B. subtilis, and S. aureus than anatase phase, under fluorescent irradiation.

Fe-doped TiO2/Kaolinite as an Antibacterial Photocatalyst under Visible Light Irradiation

“…01-075-8897. Signal from the 0.125% Fe-TiO2 crystalline phase containing Fe of the doping elements could not be observed, which consistence with several articles [26,27]. However, a increase in the anatase peak intensity was observed for Fe-doped TiO2, in comparison with TiO2.…”

“…The Fe-doped TiO2 amorphous is then calcined at 450 °C to form the crystal structure of Fe-doped TiO2 [21]. During calcination process, both of the Ti 4+ and Fe 3+ cations compete with O atoms to form Fe−O−Ti bonding in the TiO2 lattice and crystallite growth occurs simultaneously [3,21,[24][25][26].…”

“…The absorption peak at 602 cm −1 and 786 cm −1 observed on the spectrum of TiO2 corresponded to the stretching vibrations of Ti−O−Ti [15,16,26,27]. It has been observed that the addition of Fe into TiO2 matrix cause a shift of this band position to 586 cm −1 and 774 cm −1 for the Fe-doped TiO2, it is considered as a sign of existence structure defect [27].…”

Optical and Structural Characterization of Bi2FexNbO7 Nanoparticles for Environmental Applications

“…There are several possible explanations for this phenomenon. One of the most recurrent and established claims that the insertion of iron, which is a conductive metal, produces intermediate energy levels between the valence band and conduction band, compared to samples without it [16]. Then the material is able to absorb a larger part of the solar spectrum as it requires less energy photons to promote the electrons from their valence band to the conduction band.…”

Synthesis and Characterization of Various Doped TiO2 Nanocrystals for Dye-Sensitized Solar Cells

“…As compared to anatase-and rutile-TiO 2 nanoparticles, the rutile-TiO 2 evidenced an enhancement in the antibacterial activities using Escherichia coli, Bacillus subtilis, and Staphylococcus aureus. 18 Ochoa Rodri ́guez et al reported the sol−gel preparation of mesoporous Fe-TiO 2 nanoparticles by varying the concentration of iron. As compared to Fe-TiO 2 samples prepared by using 0.0125, 0.025, 0.1, and 1.0 wt % concentrations, the sample based on the 0.1 wt % concentration showed an improvement in the photocatalytic activity, which was assigned to the reduced optical band gap.…”