Chromate reduction on the novel hetero-system LiMn2O4/SnO2 catalyst under solar light irradiation

Douafer, S.; Lahmar, H.; Benamira, M.; Messaadia, L.; Mazouzi, Driss; Trari, M.

doi:10.1016/j.surfin.2019.100372

Cited by 25 publications

(3 citation statements)

References 24 publications

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“…Furthermore, the formation of nano-crystal grains is observed; the fine nature of the BZO particles is responsible for the agglomeration. The nanocrystals are nearly connected and produce large surface areas that predict enhanced photocatalytic activity [49]. The TSE-AM SEM images (c, d) can support the fact that we obtained nanoparticles since we cannot see unique particles (not agglomeration) larger than 1 µm in the SEM images.…”

Section: Morphology Investigationsupporting

confidence: 65%

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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Section: Morphology Investigationsupporting

confidence: 65%

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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“…Recently, AOPs have mostly been replaced by some previously applied water treatment methods because they have strongly succeeded in the degradation of organic pollutants. , Oxidation in AOPs can be either homogeneous or heterogeneous . The homogeneous system is used for some compounds by means of hydrogen peroxide, ozone, and ultraviolet rays, but heterogeneous systems may utilize sunlight/solar light irradiation and semiconductors. − For two main reasons, the heterogeneous photocatalysis by semiconductors is widely applied. First, they consume air as the oxidizing agent, and second, the reaction happens at ambient temperature and pressure.…”

Section: Introductionmentioning

confidence: 99%

ZnO Photocatalyst Revisited: Effective Photocatalytic Degradation of Emerging Contaminants Using S-Doped ZnO Nanoparticles under Visible Light Radiation

Mirzaeifard

Shariatinia‬

Jourshabani

et al. 2020

Ind. Eng. Chem. Res.

236

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Zinc oxide (ZnO) nanoparticles were synthesized by the hydrothermal method and incorporated with diverse amounts of the nonmetal element sulfur (0.5, 0.8, 1.1, 1.3, 2.1, 2.5, 3.2, 6.8, 7.8, 11.9, 12.3, and 17.4 wt %). The physicochemical properties of all nanoparticles were investigated by X-ray diffraction, scanning electron microscopy, energy-dispersive X-ray spectroscopy, transmission electron microscopy, and N2 adsorption/desorption isotherms, as well as Fourier transform infrared, diffuse reflectance, ultraviolet–visible absorption, and photoluminescence (PL) emission spectra. Pure ZnO and 12 S-containing ZnO nanoparticles were examined as photocatalysts for the degradation of the rhodamine B (RhB) contaminant. Among the S-containing samples, 0.10 g of the sample doped with 0.5 wt % S could degrade 100% of RhB (5 ppm) at pH = 5 in 90 min. It was also found that the 0.8 and 1.1 wt % S-doped ZnO samples could degrade 99 and 97% of RhB in 150 min, respectively. The photocatalytic property of the 0.5 wt % S-doped ZnO was improved by adding a small quantity of ammonium persulfate (0.005 g), so that it could degrade 100% of RhB in 60 min but 10 ppm RhB in 210 min. Moreover, the pure ZnO and the optimal 0.5 wt % S-doped ZnO photocatalysts displayed 2 and 53% degradation of the phenol pollutant in 180 min at pH = 5, respectively. The reusability of the 0.5 wt % S-doped ZnO optimal photocatalyst was tested under optimized conditions (catalyst dosage = 0.10 g, pH = 5, and RhB concentration = 5 ppm) for the RhB degradation exhibiting the degradation efficiency was slightly decreased from 100 to 92% after five successive reactions. Thus, such a photocatalyst could be used as a promising material for application in industrial wastewater treatment processes.

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“…The photocatalytic process of our research program aims to study the photo-dissociation of water by the illumination of a suspension of semiconductor oxides (SC). Photocatalysis is booming due to its many applications in the environmental and energy field [2][3][4][5][6]. The development of stable and active photocatalysts under solar irradiation is a major challenge.…”

Section: Introductionmentioning

confidence: 99%

Photocatalytic Evolution of Hydrogen on CuFe2O4

Lahmar

Benamira

Messaadia

et al. 2020

Springer Proceedings in Energy

Self Cite

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We investigated the technical feasibility of photochemical hydrogen release based on CuFe 2 O 4 powder dispersion in an aqueous electrolyte containing a reducing agent (S 2 O 3 −2). The oxide combines an average resistance to corrosion and an optimum inter-referred band Eg of 1.67 eV. The intercalation of a small amount of oxygen should be accompanied by partial oxidation of Cu + to Cu 2+ involving a p-type semi-conductivity. The oxidation S 2− inhibits the photo-corrosion, and the evolution of H 2 increases in parallel with the formation of polysulfides. Most of H 2 is produced when p-CuFe 2 O 4 is connected to n-ZnO formed in situ. The release of H 2 is mainly on CuFe 2 O 4, whereas, the oxidation of S 2− takes place on the surface of ZnO and the hetero-system CuFe 2 O 4 /ZnO is optimized with respect to certain physical parameters. The photoelectrochemical production of H 2 is a multi-step process whose decisive step is the arrival of electrons at the interface due to their low mobility. Remarkable performance with a rate of 6.74 (μmol g −1 min −1) cm 3 h −1 hydrogen evolution in 0.1 M S 2 O 3 −2 (pH 13) is recorded.

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Chromate reduction on the novel hetero-system LiMn2O4/SnO2 catalyst under solar light irradiation

Cited by 25 publications

References 24 publications

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

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

ZnO Photocatalyst Revisited: Effective Photocatalytic Degradation of Emerging Contaminants Using S-Doped ZnO Nanoparticles under Visible Light Radiation

Photocatalytic Evolution of Hydrogen on CuFe2O4

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