10.30495/ijc.2022.1941684.1875

Synthesis of Fe-doped TiO2 with improved photocatalytic properties under Vis-L irradiation

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  • Imane Ellouzi*1,
  • Boutaina Regraguy1,
  • Souad El Hajjaji1,
  • Mourad Harir2,
  • Philippe Schmitt-Kopplin3,
  • Hinda Lachheb2,
  • Larbi Laânab3,
  1. Laboratory of Spectroscopy, Molecular Modeling, Materials, Nanomaterials, Water and Environment, CERNE2D, Faculty of Sciences, Mohammed V University, in Rabat Av. Ibn Batouta, BP 1014 Rabat, Morocco
  2. Unité de Recherche Catalyse et Matériaux pour l’Environnement et les procédés (URCMEP), Faculté des sciences de GABES/Université de Gabes. Campus Universitaire.Cité Erriadh 6072 Gabes, Tunisia
  3. Laboratory of Conception and Systems, Faculty of Sciences, Av. Ibn Batouta, BP 1014 Rabat, Morocco
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Published in Issue 2022-07-20

How to Cite

Ellouzi, I., Regraguy, B., El Hajjaji, S., Harir, M., Schmitt-Kopplin, P., Lachheb, H., & Laânab, L. (2022). Synthesis of Fe-doped TiO2 with improved photocatalytic properties under Vis-L irradiation. Iranian Journal of Catalysis, 12(3). https://doi.org/10.30495/ijc.2022.1941684.1875
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Abstract

Fe-doped TiO2 nanoparticles were successfully synthesized by the coprecipitation method. TiO2 was doped with a different molar ratio of iron amounts, namely 0.1% and 0.2%. An undoped TiO2 was also prepared for comparison. X-ray diffraction (XRD), transmission electron microscopy (TEM) and UV-visible diffuse reflectance spectroscopy techniques were used to characterize the as-synthesized nanoparticles. The XRD spectra revealed that the photocatalysts were mostly in a well-crystallized anatase phase. Optical properties of the powders shifted from UV to the beginning of the visible light (Vis-L) region. Absorption edge wavelengths between 392 and 380 nm were obtained for the Fe-doped TiO2 and TiO2-P25, corresponding to band gap energies between 3.17 and 3.26 eV. TEM images showed homogeneity with a certain degree of agglomeration for all the samples. The photocatalytic efficiency of the as-synthesized Fe-doped TiO2 nanoparticles was performed using azo dye methyl orange (MO) in an aqueous solution under Vis-L irradiation. The photocatalytic results showed that Fe-doped TiO2 nanoparticles effectively degrade MO under Vis-L excitation and follow pseudo-first order kinetics. Besides, kinetic comparison showed that pure TiO2 is less efficient than 0.1% and 0.2% Fe-doped TiO2 because they exhibit unequaled efficiency. Moreover, the photocatalyst at 0.2% Fe-doped TiO2 molar ratio revealed the highest photocatalytic efficiency, which was 4.2 times higher compared to pure TiO2. Different amounts of Fe induced different increases in the apparent first-order rate constant of the photocatalytic process. Highlights
  • Synthesis of Fe/TiO2 via coprecipitation method.
  • Fe-TiO2 materials observed greater performance than that of pure Degussa P25.
  • The photo-activity of iron-doped TiO2 under visible light irradiation was evaluated.
  • The pseudo-first-order rate kinetics indicates a rate-limiting step involving a chemical reaction.

Keywords

  • Coprecipitation,
  • Iron,
  • MO.,
  • Photocatalytic Degradation,
  • Titanium dioxide
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