Role of cerium (Ce) dopant on structural, optical and photocatalytic properties of MgO nanoparticles by wet chemical route

Srisuvetha, V. T.; Rayar, S. L.; Shanthi, G.

doi:10.1007/s10854-019-02823-7

Cited by 23 publications

(14 citation statements)

References 18 publications

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“…Our model would also explain the decrease of the band gap

when raising Co, Ca, Li, Ce or Ag dopants, which has been found experimentally by [ 23 , 69 , 70 ]. Therefore, the doped MgO NPs could find application in photocatalysis [ 71 , 72 ].…”

Section: Numerical Results and Discussionsupporting

confidence: 65%

Magnetic, Optical and Phonon Properties of Ion-Doped MgO Nanoparticles. Application for Magnetic Hyperthermia

2023

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The influence of size and doping effects on the magnetization M, phonon ω and band gap energy Eg of MgO nanoparticles is studied using a microscopic model. The room-temperature ferromagnetism is due to surface or/and doping effects in MgO nanoparticles (NPs). The influence of the spin–phonon interaction is discussed. M increases with decreasing NP size. M and Eg can increase or decrease by different ion doping (Co, Al, La, Fe) due to the different strain that appears. It changes the lattice parameters and the exchange interaction constants. We found that MgO NP with size of 20 nm and Fe- or Co-doping concentration x = 0.1 and x = 0.2, respectively, have a Curie temperature TC = 315 K, i.e., they are appropriate for application in magnetic hyperthermia, they satisfy the conditions for that. The energy of the phonon mode ω = 448 cm−1 increases with decreasing NP size. It increases with increasing Co and Fe, or decreases with Sr ion doping.

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“…Our model would also explain the decrease of the band gap

when raising Co, Ca, Li, Ce or Ag dopants, which has been found experimentally by [ 23 , 69 , 70 ]. Therefore, the doped MgO NPs could find application in photocatalysis [ 71 , 72 ].…”

Section: Numerical Results and Discussionsupporting

confidence: 65%

Magnetic, Optical and Phonon Properties of Ion-Doped MgO Nanoparticles. Application for Magnetic Hyperthermia

2023

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“…The results showed that the 4 mol.% Fe and 2 mol.% Ag MgO NPs have achieved 88% and 75% degradation rates, respectively. Furthermore, in works [13,14] MgO was doped with rare earth elements (Gd and Ce) for the degradation of pollutants (MB, phenol, CR) under UV light in order also to improve the MgO degradation rate. The studies report on a better improvement in degradation rate (between 85-95%) using rare earths than transition metals.…”

Section: Photocatalytic Activity Of Mgo and Er-doped Mgo Npsmentioning

confidence: 99%

“…It has been found that the Gd-doped MgO nanoparticles have a higher methylene blue degradation rate than undoped MgO under UV radiation. Srisuvetha et al [14] also explored the high photocatalytic activity of Ce-doped MgO. Rare-earth elements into MgO can trap a photo-induced electron which leads to minimizing the recombination of the electron-hole pairs, enhancing the absorption level, producing few defects, thereby decreasing the band-gap energy and reducing the mean crystalline size [15].…”

Section: Introductionmentioning

confidence: 99%

Effects of Erbium Incorporation on Structural, Surface Morphology, and Degradation of Methylene Blue Dye of Magnesium Oxide Nanoparticles

Ameur

Khantoul

Boudine

et al. 2022

J Inorg Organomet Polym

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This paper reports the chemical synthesis of MgO and Er-doped MgO nanoparticles (NPs) by the sol-gel method. Their microstructural, optical characterization and the evaluation of their photocatalytic activity are presented. The synthesized NPs were characterized by means of Xray diffraction (XRD), Fourier Transform Infrared Spectroscopy (FTIR), Environmental Scanning Electron Microscopy (ESEM), Transmission Electron Microscopy (TEM), Energy Dispersive X-ray Spectroscopy (EDX), UV-visible and Photoluminescence (PL) spectroscopy. The effective synthesis of cubic MgO compound is attested by XRD, FTIR and electron diffraction in TEM. Er 2 O 3 cubic secondary phase is found in the 2 and 3 wt. % Erdoped MgO samples. The average size of the roundish cuboid-shaped crystallites decreases from 50 nm to 32 nm upon the incorporation of the rare earth element (TEM, XRD).Concomitantly, the size of flakes in which the NPs do agglomerate follows the same trend (ESEM). UV-Visible results show that the calculated band-gap energy of the NPs was in the 5.23 to 5.35 eV range. PL analysis showed that all samples have visible emissions owing to the formation of defects in the MgO band-gap. The photocatalytic activity against methylene blue dye was evaluated under UV light irradiation. The photocatalytic results showed an improvement in degradation efficiency with the addition of erbium in samples, with a maximal MB dye removal for the 3 wt. % Er-doped MgO sample after 90 min irradiation. The performance is ascribed to a higher separation of the photo-generated (electron-hole) and larger surface area.

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“…The oxidized Fe 3+ species can act as electron scavenger or acceptor to trap photoexcited electrons from conduction band (CB) of MgO and subsequently reduced to Fe 3+ . Hence, the electron (e − )-hole (h + ) recombination can be enormously decreased driving to improved photocatalytic performance [35]. In the presence of Fe:MgZnO/AC catalyst, the photocatalytic degradation kinetics of methylene blue was examined with the first and second-order kinetic model.…”

Section: Photocatalytic Activity Of Fe:mgzno/ac Catalystmentioning

confidence: 99%

Synthesis and characterization of Fe:MgZnO/AC as a prospective high photocatalytic material

Çevik¹,

Horoz²,

Baytar³

et al. 2021

JOR

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The motivation of our current study is to carry out photocatalytic degradation experiments of methylene blue in the presence of Fe doped MgZnO/AC (Fe:MgZnO/AC) and MgZnO/AC catalysts and thus to examine the effect of the Fe-dopant metal on the photocatalytic activity of the catalysts. In this context, both catalysts (MgZnO/AC and Fe:MgZnO/AC) are synthesized by hydrothermal technique. Structural (XRD analysis) and optical (UV-Vis) properties of the synthesized catalysts are discussed. How the Fedopant metal affects the crystallite size and energy band gap of the MgZnO/AC catalyst is examined and the experimental data obtained are interpreted.

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Role of cerium (Ce) dopant on structural, optical and photocatalytic properties of MgO nanoparticles by wet chemical route

Cited by 23 publications

References 18 publications

Magnetic, Optical and Phonon Properties of Ion-Doped MgO Nanoparticles. Application for Magnetic Hyperthermia

Magnetic, Optical and Phonon Properties of Ion-Doped MgO Nanoparticles. Application for Magnetic Hyperthermia

Effects of Erbium Incorporation on Structural, Surface Morphology, and Degradation of Methylene Blue Dye of Magnesium Oxide Nanoparticles

Synthesis and characterization of Fe:MgZnO/AC as a prospective high photocatalytic material

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