Photocatalytic properties insight of Sm-doped LiNbO3 in ferroelectric Li1− xNbSm1/3xO3 system

Mazkad, Driss; Lazar, Nour-eddine; Benzaouak, Abdellah; Moussadik, Ali; Hitar, Mohamed El Habib; Touach, Noureddine; Mahi, Mohammed El; Lotfi, El Mostapha

doi:10.1016/j.jece.2023.109732

Cited by 15 publications

(4 citation statements)

References 62 publications

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“…It can be seen that E g increases with x ′ . Mazkad et al [21] showed that rare earth cations, e.g., Sm in LNO, prefer occupancy of the octahedral sites of Li or Nb.…”

Section: Numerical Calculationsmentioning

confidence: 99%

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Band Gap and Polarization Tuning of Ion-Doped XNbO3 (X = Li, K, Na, Ag) for Photovoltaic and Energy Storage Applications

Apostolova,

Apostolov,

Wesselinowa

2024

Molecules

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Using a microscopic model and Green’s function theory, we have calculated the band gap energy and the polarization of LiNbO3, KNbO3, AgNbO3, and NaNbO3. The effects by substitution of different ions at A or/and B sites for doping concentration x = 0–0.1 are studied. The observed different tuning of these properties is discussed for the possibility of photovoltaic and energy storage applications of these compounds. They should have a large polarization and narrow band gap. It is shown that the band gap of all substances decreases or increases with increasing Fe or Zn dopant at the Nb site, respectively. But the substitution, for example, of Ba at the A site, leads to different behaviors of these materials. The polarization increases by Ba doping at the A site and decreases by Fe doping at the Nb site. For example, by Ba/Fe, Ba/Ni co-doping (Ba at the A site and Fe, Ni at the B site) we observe both an enhanced polarization and reduced band gap.

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“…It can be seen that E g increases with x ′ . Mazkad et al [21] showed that rare earth cations, e.g., Sm in LNO, prefer occupancy of the octahedral sites of Li or Nb.…”

Section: Numerical Calculationsmentioning

confidence: 99%

“…The band gap of pure LNO is about 4-4.2 eV [18,19]. It can be modified by different ion doping [20][21][22][23]. Let us emphasize that both ions, Nb and K (Li), could also be substituted with different ions [24].…”

Section: Introductionmentioning

confidence: 99%

Band Gap and Polarization Tuning of Ion-Doped XNbO3 (X = Li, K, Na, Ag) for Photovoltaic and Energy Storage Applications

Apostolova,

Apostolov,

Wesselinowa

2024

Molecules

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“…Consequently, significant research efforts have been channeled toward investigating the reaction between complex dye pollutants and various disinfectants. Various advanced oxidation technologies have been engineered to achieve environmentally friendly pollutant removal, including adsorption [14][15][16][17], electrocatalytic degradation [18][19][20], and photodegradation [21][22][23]. The ultimate goal is to degrade these organic contaminants into harmless substances like H 2 O and CO 2 [24][25][26].…”

Section: Introductionmentioning

confidence: 99%

Design of Bismuth Tungstate Bi2WO6 Photocatalyst for Enhanced and Environmentally Friendly Organic Pollutant Degradation

El Aouni,

El Ouardi,

Arab

et al. 2024

Materials

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In this study, a chemical precipitation approach was adopted to produce a photocatalyst based on bismuth tungstate Bi2WO6 for enhanced and environmentally friendly organic pollutant degradation. Various tools such as X-ray diffraction (XRD), Raman spectroscopy, scanning electron microscopy (SEM), optical spectroscopy and X-ray photoelectron spectroscopy, were employed to assess the structural and morphological properties. Hence, the XRD profiles showed a well crystallized Bi2WO6 orthorhombic phase. The photocatalytic performance of the resulting photocatalyst was assessed by the decomposition of Rhodamine B (RhB) and methyl orange (MO) with a decomposition efficiency of 97 and 92%, along with the highest chemical oxygen demand of 82 and 79% during 120 min of illumination, respectively. The principal novelty of the present work is to focus on the changes in the crystalline structure, the morphology, and the optical and the photoelectrochemical characteristics of the Bi2WO6, by tuning the annealing temperature of the designed photocatalyst. Such physicochemical property changes in the as-prepared photocatalyst will affect in turn its photocatalytic activity toward the organic pollutant decomposition. The photocatalytic mechanism was elaborated based on electrochemical impedance spectroscopy, photocurrent analysis, photoluminescence spectroscopy, and radical trapping measurements. The overall data indicate that the superoxide O2•− and holes h+ are the principal species responsible for the pollutant photodegradation.

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“…Due to urbanization and industrialization, pollution of water sources, including rivers, lakes, oceans and others, is a growing problem. 1–3 The leading cause of water pollution worldwide is the release of industrial waste, like heavy metals, dyes, pharmaceuticals and pesticides, without proper disposal. 4 This increases chemical toxicity, reduces photosynthetic activity in waterways, and endangers the ecosystem and public health because these pollutants are not biodegradable and accumulate in water sources.…”

Section: Introductionmentioning

confidence: 99%

Recent trends on MIL-Fe metal–organic frameworks: synthesis approaches, structural insights, and applications in organic pollutant adsorption and photocatalytic degradation

Channab,

El Ouardi,

Ait Layachi

et al. 2023

Environ. Sci.: Nano

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Photocatalytic properties insight of Sm-doped LiNbO3 in ferroelectric Li1− xNbSm1/3xO3 system

Cited by 15 publications

References 62 publications

Band Gap and Polarization Tuning of Ion-Doped XNbO3 (X = Li, K, Na, Ag) for Photovoltaic and Energy Storage Applications

Band Gap and Polarization Tuning of Ion-Doped XNbO3 (X = Li, K, Na, Ag) for Photovoltaic and Energy Storage Applications

Design of Bismuth Tungstate Bi2WO6 Photocatalyst for Enhanced and Environmentally Friendly Organic Pollutant Degradation

Recent trends on MIL-Fe metal–organic frameworks: synthesis approaches, structural insights, and applications in organic pollutant adsorption and photocatalytic degradation

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