Photocatalytic performances of ZnCr2O4 nanoparticles for cephalosporins removal: Structural, optical and electrochemical properties

Benrighi, Yasmine; Nasrallah, Noureddine; Chaabane, T.; Sivasankar, V.; Darchen, André; Baaloudj, Oussama

doi:10.1016/j.optmat.2021.111035

Cited by 47 publications

(11 citation statements)

References 43 publications

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“…Most of the Exp. E g values listed in Table1are optical band gaps obtained by UV-Vis absorption49,51,[54][55][56]58,59,64 or diffuse reectance spectroscopy 46,52. The values indicate that the calculated band gaps of FeCr 2 O 4 , CoCr 2 O 4 , ZnCr 2 O 4 , ZnFe 2 O 4 , ZnCo 2 O 4 and LiMn 2 O 4 accord well with the experimental measured values with errors within 0.5 eV.In summary, the conguration of cation B has notable inuence on the electronic structure of spinels.…”

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confidence: 99%

A GGA + U investigation into the effects of cations on the electromagnetic properties of transition metal spinels

Peng

et al. 2021

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A GGA + U investigation into the effects of cations on the electromagnetic properties of transition metal spinels

Peng

et al. 2021

RSC Adv.

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“…This surface can be determined from crystallite size values by assuming nanocrystalline spheres and using the Brunauer-Emmett-Teller (BET) relation [ 46 ].

where

= 8.91 g/cm 3 is the density and obtained from the equation,

[ 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: Resultsmentioning

confidence: 99%

“…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%

“…No matter how small the concentration of these pollutants in water may be, the organs of living beings might be damaged by long-term exposure to them [8,9]. Companies, such as pharmaceutical, textile, and thinner and metallurgical industries, are the primary sources of these water pollutants [10]. Among these compounds, antibiotics as organic compounds and heavy metals (HMs) as inorganic compounds are two of the most hazardous contaminants.…”

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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“…Traditional methods of water treatment cannot effectively eliminate pollutants from wastewaters and could cause great harm to the environment [1][2][3][4]. On the other hand, it has been shown that photocatalysis is a promising approach for the degradation of nonbiodegradable compounds in water [5,6]. It is based on a photocatalyst that can be activated by light such as sunlight and using this energy to remove various types of pollutants [7].…”

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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Photocatalytic performances of ZnCr2O4 nanoparticles for cephalosporins removal: Structural, optical and electrochemical properties

Cited by 47 publications

References 43 publications

A GGA + U investigation into the effects of cations on the electromagnetic properties of transition metal spinels

A GGA + U investigation into the effects of cations on the electromagnetic properties of transition metal spinels

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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