Structural and electrochemical characterizations of Bi12CoO20 sillenite crystals: degradation and reduction of organic and inorganic pollutants

Kenfoud, Hamza; Baaloudj, Oussama; Nasrallah, Noureddine; Bagtache, R.; Assadi, Aymen Amin; Trari, M.

doi:10.1007/s10854-021-06194-w

Cited by 39 publications

(15 citation statements)

References 43 publications

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“…where ρ = 8.91 g/cm 3 is the density and obtained from the equation, ρ = ZM N A V [10], where Z = 2 [35] is the number of model units in a single cell. According to these calculations, the surface area for the sillenite nano-powder is 11.22 m 2 /g.…”

Section: Phase Identification and Structural Investigationmentioning

confidence: 99%

“…According to previous studies dealing with photocatalytic elimination of organic or/and inorganic pollutants [35,61,62], the possible mechanism of the photocatalytic process can be summarized by the schematic in Figure 10.…”

Section: Proposed Mechanism Of the Photocatalytic Removalmentioning

confidence: 99%

“…Within the bismuth semiconductor category, sillenite forms of Bi 12 [M]O 20 have attracted many scientists because of their unique crystal structures, interesting photochromic qualities, peculiar electronics, and dielectric photorefractive properties, promising optical activity [29][30][31]. There are a large number of new sillenites that have been used as photocatalysts in previous research, such as Bi 12 TiO 20 [32], Bi 12 GeO 20 [33], Bi 12 NiO 19 [34], Bi 12 CoO 20 [35], and Bi 12 ZnO 20 [36]. Among these, the bismuth zincate sillenite Bi 12 ZnO 20 (BZO) has drawn tremendous interest because of its tiny band gap, its stability, and its high photoconductivity [37][38][39].…”

Section: Introductionmentioning

confidence: 99%

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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: Phase Identification and Structural Investigationmentioning

confidence: 99%

Section: Proposed Mechanism Of the Photocatalytic Removalmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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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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“…Where D is the regular phase crystallite, K is the Scherener constant, β is the full width at the highest half of the phase, is the angle Braggs, is Avogadro's number, is the Molecular mass of BNO (2870.45 g•mol −1 ), is the density of X-ray, is the count of model units in a cell (Z = 2 for sillenites [26]) and is the unit cell volume (1083.428335 Å 3) and S is the specific surface area.…”

Section: Phase Identification and Structural Investigationmentioning

confidence: 99%

“…Their overall structure is described by the atom of bismuth surrounded by seven oxygen atoms that share corners with other similar Bi polyhedrons and with MO4 which represents a tetravalent ion or a combination of ions that exist both at the cube center and on the corners in the BMO structure [23,24]. There are a significant number of new sillenites that are used as photo-catalysts in previous research, such as Bi12TiO20 [25], Bi12GeO20 [21], Bi12PbO19 [22], Bi12CoO20 [26], Bi12SiO20 [21], Bi12MnO20 [17], Bi12FeO20 [27] and Bi12ZnO20 [28]. Among the sillenite crystals, bismuth nickelate Bi12NiO19 (BNO) has not been used as a photocatalyst yet, although it has recently gained considerable attention because of its tiny bandgap, its high photoconductivity, ease of separation of photogenerated electron-hole pairs and ease of recycling [29][30][31].…”

Section: Introductionmentioning

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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Facile electrodeposition of ZnO on graphitic substrate for photocatalytic application: degradation of antibiotics in a continuous stirred-tank reactor

Bourkeb

Baaloudj

2021

J Solid State Electrochem

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Structural and electrochemical characterizations of Bi12CoO20 sillenite crystals: degradation and reduction of organic and inorganic pollutants

Cited by 39 publications

References 43 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

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

Facile electrodeposition of ZnO on graphitic substrate for photocatalytic application: degradation of antibiotics in a continuous stirred-tank reactor

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