Photoelectrochemical study of the spinel CaFe2O4 nanostructure: application to Basic Blue 41 oxidation under solar light

Kenfoud, Hamza; Nasrallah, Noureddine; Meziani, D.; Trari, M.

doi:10.1007/s10008-021-04952-8

Cited by 13 publications

(9 citation statements)

References 53 publications

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“…However, the pollutant degradation will tend to be limited at high time values, because these values are too high to form multiple layers of catalysts, thus generating different ions and charges, which leads to distinguished charges at the interfaces of thin films and coverage of all TiO2-NTs. At low concentrations, the kinetics are faster [31]. This can be explained by the fact that more molecules are "available" in the solution and that visible light accesses the surface of the catalyst more easily, which leads to an increase in the speed of photocatalytic degradation [32][33][34][35].…”

Section: Effect Of Inlet Concentration: Kinetic Modelingmentioning

confidence: 99%

“…This can be explained by the fact that more molecules are "available" in the solution and that visible light accesses the surface of the catalyst more easily, which leads to an increase in the speed of photocatalytic degradation [32][33][34][35]. However, at high concentrations, molecules begin to act as a filter for incident visible light, so that light hardly reaches the surface of the TiO2, At low concentrations, the kinetics are faster [31]. This can be explained by the fact that more molecules are "available" in the solution and that visible light accesses the surface of the catalyst more easily, which leads to an increase in the speed of photocatalytic degradation [32][33][34][35].…”

Section: Effect Of Inlet Concentration: Kinetic Modelingmentioning

confidence: 99%

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Synthesis and Characterization of TiO2 Nanotubes (TiO2-NTs) with Ag Silver Nanoparticles (Ag-NPs): Photocatalytic Performance for Wastewater Treatment under Visible Light

et al. 2022

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In this work, we present the influence of the decoration of TiO2 nanotubes (TiO2-NTs) with Ag silver nanoparticles (Ag-NPs) on the photocatalysis of emerging pollutants such as the antibiotic diclofenac sodium. The Ag-NPs were loaded onto the TiO2-NTs by the anodization of metallic titanium foils. Diclofenac sodium is an emerging pollutant target of the pharmaceutical industry because of its negative environmental impact (high toxicity and confirmed carcinogenicity). The obtained Ag-NP/TiO2-NT nanocomposites were characterized by X-ray diffraction (XRD), photoluminescence spectroscopy (PL), scanning electron microscopy (SEM), transmission spectroscopy (TEM), and X-ray photoelectron spectroscopy (XPS). In order to study the photocatalytic behavior of Ag-NPs/TiO2-NTs with visible cold LEDs, the possible photocatalytic mechanism of antibiotic degradation with reactive species (O2°− and OH°) was detailed. Moreover, the Langmuir–Hinshelwood model was used to correlate the experimental results with the optimized catalyst. Likewise, reuse tests showed the chemical stability of the catalyst.

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Section: Effect Of Inlet Concentration: Kinetic Modelingmentioning

confidence: 99%

Section: Effect Of Inlet Concentration: Kinetic Modelingmentioning

confidence: 99%

Synthesis and Characterization of TiO2 Nanotubes (TiO2-NTs) with Ag Silver Nanoparticles (Ag-NPs): Photocatalytic Performance for Wastewater Treatment under Visible Light

et al. 2022

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“…For this, a UVA lamp was used in the experiments with the catalyst. UV-visible diffuse reflectance spectroscopy (DRS) studies play an essential role in the estimation of the optical band gap energy (E g ) and electronic structures of the metal oxide semiconductor materials [53,54]. To assess the light absorption of our sillenite Bi 12 ZnO 20 nanopowder, diffuse reflectance spectra were investigated in the range of 200-800 nm at room temperature, as are shown in Figure 6 (inset).…”

Section: Optical Property Investigationmentioning

confidence: 99%

Application of Bi12ZnO20 Sillenite as an Efficient Photocatalyst for Wastewater Treatment: Removal of Both Organic and Inorganic Compounds

et al. 2021

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This work aims to synthesize and characterize a material that can be used as an effective catalyst for photocatalytic application to remove both organic and inorganic compounds from wastewater. In this context, sillenite Bi12ZnO20 (BZO) in a pure phase was synthesized using the sol–gel method. Before calcination, differential scanning calorimetry (DSC) analysis was done to determine the temperature of the formation of the sillenite phase, which was found to be 800 °C. After calcination, the phase was identified by X-ray diffraction (XRD) and then refined using the Rietveld refinement technique. The results prove that BZO crystals have a cubic symmetry with the space group I23 (N°197); the lattice parameters of the structure were also determined. From the crystalline size, the surface area was estimated using the Brunauer-Emmett-Teller (BET) method, which was found to be 11.22 m2/g. The formation of sillenite was also checked using the Raman technique. The morphology of the crystals was visualized using electron scanning microscope (SEM) analysis. After that, the optical properties of BZO were investigated by diffuse reflectance spectroscopy (DRS) and photoluminescence (PL); an optical gap of 2.9 eV was found. In the final step, the photocatalytic activity of the BZO crystals was evaluated for the removal of inorganic and organic pollutants, namely hexavalent chromium Cr(VI) and Cefixime (CFX). An efficient removal rate was achieved for both contaminants within only 3 h, with a 94.34% degradation rate for CFX and a 77.19% reduction rate for Cr(VI). Additionally, a kinetic study was carried out using a first-order model, and the results showed that the kinetic properties are compatible with this model. According to these findings, we can conclude that the sillenite BZO can be used as an efficient photocatalyst for wastewater treatment by eliminating both organic and inorganic compounds.

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“…It was already demonstrated in our previous works [13,14] that the degradation of the dye as an organic compound in the photocatalytic process is mainly due to the reactive oxidative species (ROS) such as superoxide radicals (O2  − ) and hydroxyl radicals ( • OH), where the electrons of Bi12NiO19 conduction band are degraded the Basic Blue 41 by reducing the absorbed O2 to the super-radical anion O2  − . The oxidation occurs concomitantly by radicals • OH through a valence band that reacts with H2O [43]. In order to investigate the active species for the degradation of BB41, isopropanol and benzoquinone were chosen as scavenger agents to capture • OH and O2  − , respectively.…”

Section: Photocatalytic Activitymentioning

confidence: 99%

Structural and Optical Properties of Bi12NiO19 Sillenite Crystals: Application for the Removal of Basic Blue 41 from Wastewater

et al. 2021

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This article covers the structural and optical property analysis of the sillenite Bi12NiO19 (BNO) in order to characterize a new catalyst that could be used for environmental applications. BNO crystals were produced by the combustion method using Polyvinylpyrrolidone as a combustion reagent. Different approaches were used to characterize the resulting catalyst. Starting with X-ray diffraction (XRD), the structure was refined from XRD data using the Rietveld method and then the structural form of this sillenite was illustrated for the first time. This catalyst has a space group of I23 with a lattice parameter of a = 10.24 Å. In addition, the special surface area (SSA) of BNO was determined by the Brunauer-Emmett-Teller (BET) method. It was found in the range between 14.56 and 20.56 cm2·g−1. Then, the morphology of the nanoparticles was visualized by Scanning Electron Microscope (SEM). For the optical properties of BNO, UV-VIS diffusion reflectance spectroscopy (DRS) was used, and a 2.1 eV optical bandgap was discovered. This sillenite′s narrow bandgap makes it an effective catalyst for environmental applications. The photocatalytic performance of the synthesized Bi12NiO19 was examined for the degradation of Basic blue 41. The degradation efficiency of BB41 achieved 98% within just 180 min at pH ~9 and with a catalyst dose of 1 g/L under visible irradiation. The relevant reaction mechanism and pathways were also proposed in this work.

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Photoelectrochemical study of the spinel CaFe2O4 nanostructure: application to Basic Blue 41 oxidation under solar light

Cited by 13 publications

References 53 publications

Synthesis and Characterization of TiO2 Nanotubes (TiO2-NTs) with Ag Silver Nanoparticles (Ag-NPs): Photocatalytic Performance for Wastewater Treatment under Visible Light

Synthesis and Characterization of TiO2 Nanotubes (TiO2-NTs) with Ag Silver Nanoparticles (Ag-NPs): Photocatalytic Performance for Wastewater Treatment under Visible Light

Application of Bi12ZnO20 Sillenite as an Efficient Photocatalyst for Wastewater Treatment: Removal of Both Organic and Inorganic Compounds

Structural and Optical Properties of Bi12NiO19 Sillenite Crystals: Application for the Removal of Basic Blue 41 from Wastewater

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