Enhanced photocatalytic activity of layered perovskite oxides Sr2.7-xCaxLn0.3Fe2O7-δ for MB degradation

Verduzco, L.E.; Garcia-Diaz, Reyes; Oliva, J.; Martı́nez, Arturo I.; Gómez-Solís, C.; García, C.R.; Fuentes, Antonio F.; Padmasree, K.P.

doi:10.1016/j.ceramint.2018.06.155

Cited by 20 publications

(20 citation statements)

References 40 publications

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“…The XRF analysis was performed based on the fundamental parameter method, and for AAS the standard addition method was used, in which well-defined amounts of either Ni-or La-standard solution (ROTH, ROTIStar 1000 mg/L) were added. The obtained La/Ni ratios of 2.1(1) (XRF) and 2.03 (7) (AAS) are very close to the nominal value of 2.…”

Section: ■ Experimental Sectionsupporting

confidence: 74%

“…Ruddlesden–Popper (RP) oxides with the general formula A n +1 B n O 3 n +1 (with A being a large, low-charge cation and B being a small cation with usually higher charge) are known for their vast variety of physical properties like high ionic transport, , photocatalytic activity, − ferroelectricity , or unusual magnetism. − The most prominent example of this family is perhaps La 2– x Ba x CuO 4 , found to be superconducting in 1987 by Bednorz and Müller, leading to the discovery of superconductivity above the boiling of nitrogen in YBa 2 Cu 3 O 7− x . Cationic substitutions have widely been used to tailor the physical properties of RP oxides.…”

Section: Introductionmentioning

confidence: 99%

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Structure, Magnetism, and Thermal Stability of La₂NiO_2.5F₃: A Ruddlesden–Popper Oxyfluoride Crystallizing in Space Group P4₂/nnm

et al. 2021

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We report on the new Ruddlesden–Popper (RP) oxyfluoride La2NiO2.5F3 containing an unprecedented high amount of fluorine and Ni2+. This oxyfluoride was prepared by topochemical low-temperature fluorination of La2NiO4, which was obtained by a soft chemistry synthesis, with poly(vinylidene difluoride) (PVDF) as fluorinating agent. La2NiO2.5F3 is the first n = 1 RP compound crystallizing in the tetragonal space group P42/nnm (a = 5.7297(6) Å and c = 13.0106(2) Å). The crystal structure shows a unique tilting scheme of the NiO4F2 octahedra that has so far been only theoretically predicted. Combined neutron and X-ray powder diffraction experiments together with bond-valence-sum and DFT+U calculations reveal an unusual anion ordering with fluoride being located on the apical anion sites of the NiO4F2 octahedra. Excess fluorine ions were found to populate two of the four interstitial anion sites in an ordered fashion. A third interstitial anion position is occupied by oxygen ions while the fourth site remains unoccupied. This hitherto unobserved ordering scenario in RP oxyfluorides promotes a strong layerwise alternating tilting of the NiO4F2 octahedra. Magnetic measurements show strong antiferromagnetic interactions with a high Néel temperature of about 225 K and a pronounced ZFC/FC splitting most likely as the result of a small ferromagnetic moment arising from spin canting. The electronic structure was characterized by DFT and UV–vis spectroscopy, and a strong increase of E g was found compared to La2NiO4 (3.4 eV vs 1.3 eV).

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Section: ■ Experimental Sectionsupporting

confidence: 74%

Section: Introductionmentioning

confidence: 99%

Structure, Magnetism, and Thermal Stability of La₂NiO_2.5F₃: A Ruddlesden–Popper Oxyfluoride Crystallizing in Space Group P4₂/nnm

et al. 2021

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“…In another study, Ca 2+ doping in Sr 2.7– x Ca x Ln 0.3 Fe 2 O 7−δ (Ln = La and Nd, and x = 0 and 0.3) increased the band gaps of Sr 2.7 Ln 0.3 Fe 2 O 7−δ (Ln = La and Nd) RP-structured perovskites as a result of the formation of oxygen vacancies after the Ca 2+ doping . A higher concentration of oxygen vacancies was found in Sr 2.7– x Ca x Nd 0.3 Fe 2 O 7−δ than in Sr 2.7– x Ca x La 0.3 Fe 2 O 7−δ as a result of the smaller ionic radius of Nd 3+ compared to La 3+ , thereby leading to stronger lattice distortions of the crystal structures.…”

Section: Advances In Rp Perovskite Oxides In Photocatalysismentioning

confidence: 95%

“…In addition to O-site doping, A-site doping in RP perovskites by Ca 2+ or Na + has also received increasing attention recently. − The influence of the Ca 2+ doping amount on the photocatalytic activity of Sr 3.2– x Ca x La 0.8 Fe 1.5 Co 1.5 O 10−δ ( x = 0, 0.2, 0.4, and 0.8) for MB degradation has been investigated . Ca 2+ doping substantially enhanced the photocatalytic activity of pristine Sr 3.2 La 0.8 Fe 1.5 Co 1.5 O 10−δ as a result of the suppressed band gap, improved sunlight absorption capability, reduced particle size, and higher oxygen amount in the RP perovskites, which enhanced the electron conductivity at room temperature, thereby reducing the possibility of electron–hole pair recombination.…”

Section: Advances In Rp Perovskite Oxides In Photocatalysismentioning

confidence: 99%

Ruddlesden–Popper Perovskite Oxides for Photocatalysis-Based Water Splitting and Wastewater Treatment

et al. 2020

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Renewable and clean energy supplies are highly critical for the reduction of greenhouse emissions and environmental pollution to realize a sustainable society. Among various techniques for using sustainable energy sources, such as solar energy, photocatalysis plays a crucial role in solving global problems, such as the energy crisis and environmental pollution. Thus, the design and development of Earth-abundant, low-cost, high-performance photocatalysts for water splitting and wastewater treatment are critical. Among these photocatalysts, Ruddlesden−Popper (RP) perovskites have attracted increasing attention in photocatalysis as a result of their unique structural, electronic, and optical characteristics. In this review, the recent advances of RP perovskites in photocatalysis are presented. The review begins with an introduction of the unique features of RP perovskites that are suitable for photocatalysis, which is followed by a discussion of the use of typical RP-type perovskite oxides as photocatalysts by highlighting several useful design strategies. Finally, the conclusions of this review, along with current challenges and future directions for the design of RP perovskites for photocatalysis, are presented and discussed. This review aims to provide helpful guidance for the future development of RP-type perovskite oxides for photocatalysis-based water splitting and wastewater treatment.

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“…Also, in order to improve the photocatalytic performance of lanthanum-based perovskites, multiple complex or layered perovskite oxides containing lanthanum have been used. For example, Verduzco et al (2018) synthesized a layered perovskite oxide Sr 2.7-x Ca x Ln 0.3 Fe 2 O 7-δ (Ln Nd and La) by a conventional solid-state reaction for degradation of methylene blue (MB) dye under solar and UV irradiation.…”

Section: Lanthanum-based Perovskites In Photocatalysismentioning

confidence: 99%

Perovskite Oxide–Based Materials for Photocatalytic and Photoelectrocatalytic Treatment of Water

Nkwachukwu

Arotiba

2021

Front. Chem.

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Meeting the global challenge of water availability necessitates diversification from traditional water treatment methods to other complementary methods, such as photocatalysis and photoelectrocatalysis (PEC), for a more robust solution. Materials play very important roles in the development of these newer methods. Thus, the quest and applications of a myriad of materials are ongoing areas of water research. Perovskite and perovskite-related materials, which have been largely explored in the energy sectors, are potential materials in water treatment technologies. In this review, attention is paid to the recent progress in the application of perovskite materials in photocatalytic and photoelectrocatalytic degradation of organic pollutants in water. Water treatment applications of lanthanum, ferrite, titanate, and tantalum (and others)-based perovskites are discussed. The chemical nature and different synthetic routes of perovskites or perovskite composites are presented as fundamental to applications.

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Enhanced photocatalytic activity of layered perovskite oxides Sr2.7-xCaxLn0.3Fe2O7-δ for MB degradation

Cited by 20 publications

References 40 publications

Structure, Magnetism, and Thermal Stability of La₂NiO_2.5F₃: A Ruddlesden–Popper Oxyfluoride Crystallizing in Space Group P4₂/nnm

Structure, Magnetism, and Thermal Stability of La₂NiO_2.5F₃: A Ruddlesden–Popper Oxyfluoride Crystallizing in Space Group P4₂/nnm

Ruddlesden–Popper Perovskite Oxides for Photocatalysis-Based Water Splitting and Wastewater Treatment

Perovskite Oxide–Based Materials for Photocatalytic and Photoelectrocatalytic Treatment of Water

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Enhanced photocatalytic activity of layered perovskite oxides Sr2.7-xCaxLn0.3Fe2O7-δ for MB degradation

Cited by 20 publications

References 40 publications

Structure, Magnetism, and Thermal Stability of La2NiO2.5F3: A Ruddlesden–Popper Oxyfluoride Crystallizing in Space Group P42/nnm

Structure, Magnetism, and Thermal Stability of La2NiO2.5F3: A Ruddlesden–Popper Oxyfluoride Crystallizing in Space Group P42/nnm

Ruddlesden–Popper Perovskite Oxides for Photocatalysis-Based Water Splitting and Wastewater Treatment

Perovskite Oxide–Based Materials for Photocatalytic and Photoelectrocatalytic Treatment of Water

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Structure, Magnetism, and Thermal Stability of La₂NiO_2.5F₃: A Ruddlesden–Popper Oxyfluoride Crystallizing in Space Group P4₂/nnm

Structure, Magnetism, and Thermal Stability of La₂NiO_2.5F₃: A Ruddlesden–Popper Oxyfluoride Crystallizing in Space Group P4₂/nnm