Effect of Fe-doped TiO<sub>2</sub>photocatalysts on the degradation of acid orange 7

Hung, Yung‐Tse; Butler, Erick; Chen, Ching-Cheng; Ahmad, Mohammed Suleiman Al; Fu, Yen−Pei

doi:10.1080/10584587.2016.1157779

Cited by 22 publications

(5 citation statements)

References 24 publications

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“…Butler et al prepared Fe-doped TiO 2 by a conventional solid-state reaction method for Acid Orange 7 (AO7) degradation [ 33 ]. Ganesh et al prepared Fe-doped TiO 2 powders by a conventional co-precipitation technique for degradation of methylene blue under visible light [ 32 ].…”

Section: Introductionmentioning

confidence: 99%

Visible Light-Driven Photocatalytic Activity and Kinetics of Fe-Doped TiO2 Prepared by a Three-Block Copolymer Templating Approach

et al. 2021

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Fe-doped titania photocatalysts (with 1, 2.5, and 3.5 wt. % Fe nominal content), showing photocatalytic activity under visible light, were prepared by a soft-template assisted sol–gel approach in the presence of the triblock copolymer Pluronic P123. An undoped TiO2 photocatalyst was also prepared for comparison. The photocatalysts were characterized by means of X-ray powder Diffraction (XRPD), Quantitative Phase Analysis as obtained by Rietveld refinement, Diffuse Reflectance (DR) UV−Vis spectroscopy, N2 adsorption/desorption at −196 °C, electrophoretic mobility in water (ζ-potential), and X-ray photoelectron spectroscopy (XPS). The physico-chemical characterization showed that all the samples were 100% anatase phase and that iron was present both in the bulk and at the surface of the Fe-doped TiO2. Indeed, the band gap energy (Eg) decreases with the Fe content, with Tauc’s plot determined values ranging from 3.35 (undoped TiO2) to 2.70 eV (3.5 wt. % Fe). Notwithstanding the obtained Eg values, the photocatalytic activity results under visible light highlighted that the optimal Fe content was equal to 2.5 wt. % (Tauc’s plot determined Eg = 2.74 eV). With the optimized photocatalyst and in selected operating conditions, under visible light it was possible to achieve 90% AO7 discoloration together with a TOC removal of 40% after 180 min. The kinetic behavior of the photocatalyst was also analyzed. Moreover, the tests in the presence of three different scavengers revealed that the main reactive species are (positive) holes and superoxide species. Finally, the optimized photocatalyst was also able to degrade phenol under visible light.

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Section: Introductionmentioning

confidence: 99%

Visible Light-Driven Photocatalytic Activity and Kinetics of Fe-Doped TiO2 Prepared by a Three-Block Copolymer Templating Approach

et al. 2021

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“…These results may be related to a Fe ion embedment into the crystal lattice [24]. Finally, the Fe 2p XPS superimposed spectra of the Fe-TiO 2 with Fe 2p 3/2 and Fe 2p 1/2 peaks at 711.2 and 724.1 eV, respectively, (Figure 3d–f), demonstrated that Fe mainly existed in the +3 oxidation state [22]. In addition, the satellite peak located at 717.2 eV further supported the presence of the Fe 3+ ionic state [23].…”

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

“…In the Ti 2p core level spectra of all the nanoparticles, two distinct peaks appeared (Ti 2p 3/2 at 459.5 eV and Ti 2p 1/2 at 465.4 eV), showing that the oxidation state of titanium is Ti 4+ (Figure 3b) [22]. Both the symmetry of these peaks and the absence of shoulders are correlated with the formation of TiO 2 crystals without peculiar defects [22]. The peak of O 1s at 530.9 eV (Figure 3c), attributed to TiO 2 , exhibit an asymmetry to higher binding energies (~ 533 eV), due to the presence of OH groups on TiO 2 surface [23,24].…”

Section: Resultsmentioning

confidence: 99%

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Characterization of Photoactive Fe-TiO2 Lime Coatings for Building Protection: The Role of Iron Content

et al. 2019

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Iron-doped TiO2 nanoparticles, ranging in Fe concentrations from 0.05 up to 1.00% w/w, were synthesized through a simple sol-gel method. Fourier-transform infrared spectroscopy (FTIR), X-ray powder diffraction (XRD), Ultraviolet-Visible (UV-Vis) spectroscopy, nitrogen adsorption−desorption isotherms, X-ray photoelectron spectroscopy (XPS), and X-ray absorption near-edge structure spectroscopy (XANES) were used to characterize the synthesized nanoparticles. The characterization of the Fe-doped TiO2 nanoparticles revealed the predominant presence of anatase crystalline form, as well as the incorporation of the Fe3+ ions into the crystal lattice of TiO2. The photocatalytic assessment of the Fe-doped TiO2 nanoparticles indicated that the low iron doping titania (0.05 and 0.10% w/w) have a positive effect on the photocatalytic degradation of Methyl Orange under visible radiation. Moreover, FTIR monitoring of calcium hydroxide pastes enriched with low Fe-doped TiO2 revealed enhancement of carbonation at both early and later stages. Improved photocatalytic performance and increased lime carbonation, observed in lime coatings with low Fe-doped TiO2 admixtures, established them as invaluable contributors to the protection of the built environment.

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“…R 2 ranges from 0.9323 to 0.9990, confirming the suitability of the pseudo-first order model to describe the kinetics of OII removal in the presence of ZnO-Ag (1.3%) and ZnO NPs, also applied by other authors to model the photocatalytic degradation of dyes and emerging contaminants. [16,27,[29][30][31]. Other works reported the photocatalytic degradation of OII using modified ZnO catalyst to improve kinetics.…”

Section: Influence Of Photocatalyst Concentration On Oii Removalmentioning

confidence: 99%

Enhanced Photocatalytic Activity of Semiconductor Nanocomposites Doped with Ag Nanoclusters Under UV and Visible Light

et al. 2019

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Emerging contaminants (ECs) represent a wide range of compounds, whose complete elimination from wastewaters by conventional methods is not always guaranteed, posing human and environmental risks. Advanced oxidation processes (AOPs), based on the generation of highly oxidizing species, lead to the degradation of these ECs. In this context, TiO2 and ZnO are the most widely used inorganic photocatalysts, mainly due to their low cost and wide availability. The addition of small amounts of nanoclusters may imply enhanced light absorption and an attenuation effect on the recombination rate of electron/hole pairs, resulting in improved photocatalytic activity. In this work, we propose the use of silver nanoclusters deposited on ZnO nanoparticles (ZnO–Ag), with a view to evaluating their catalytic activity under both ultraviolet A (UVA) and visible light, in order to reduce energetic requirements in prospective applications on a larger scale. The catalysts were produced and then characterized by scanning electron microscopy (SEM), X-ray diffractometry (XRD) and inductively coupled plasma-optical emission spectrometry (ICP-OES). As proof of concept of the capacity of photocatalysts doped with nanoclusters, experiments were carried out to remove the azo dye Orange II (OII). The results demonstrated the high photocatalytic efficiency achieved thanks to the incorporation of nanoclusters, especially evident in the experiments performed under white light.

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Effect of Fe-doped TiO₂photocatalysts on the degradation of acid orange 7

Cited by 22 publications

References 24 publications

Visible Light-Driven Photocatalytic Activity and Kinetics of Fe-Doped TiO2 Prepared by a Three-Block Copolymer Templating Approach

Visible Light-Driven Photocatalytic Activity and Kinetics of Fe-Doped TiO2 Prepared by a Three-Block Copolymer Templating Approach

Characterization of Photoactive Fe-TiO2 Lime Coatings for Building Protection: The Role of Iron Content

Enhanced Photocatalytic Activity of Semiconductor Nanocomposites Doped with Ag Nanoclusters Under UV and Visible Light

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Effect of Fe-doped TiO2photocatalysts on the degradation of acid orange 7

Cited by 22 publications

References 24 publications

Visible Light-Driven Photocatalytic Activity and Kinetics of Fe-Doped TiO2 Prepared by a Three-Block Copolymer Templating Approach

Visible Light-Driven Photocatalytic Activity and Kinetics of Fe-Doped TiO2 Prepared by a Three-Block Copolymer Templating Approach

Characterization of Photoactive Fe-TiO2 Lime Coatings for Building Protection: The Role of Iron Content

Enhanced Photocatalytic Activity of Semiconductor Nanocomposites Doped with Ag Nanoclusters Under UV and Visible Light

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Effect of Fe-doped TiO₂photocatalysts on the degradation of acid orange 7