Fabrication and Photocatalytic Applications of Perovskite Materials with Special Emphasis on Alkali-Metal-Based Niobates and Tantalates

Ahmad, Tokeer; Farooq, Umar; Phul, Ruby

doi:10.1021/acs.iecr.7b04641

Cited by 61 publications

(46 citation statements)

References 181 publications

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“…Interestingly, the Nd 0.3 Sr 0.7 MnO 3 content has the highest degradation rate of AO which is two times faster than undoped NdMnO 3 . This superior behavior in photocatalytic activity of Nd 0.3 Sr 0.7 MnO 3 nanocomposite emerges from large surface area, structural anisotropy, and small particle size 56 . As shown in XRD findings, the phase crystalline NdMnO 3 nanocomposite is monoclinic and orthorhombic crystals.…”

Section: Resultsmentioning

confidence: 99%

Doping Strontium into Neodymium Manganites Nanocomposites for Enhanced Visible light Driven Photocatalysis

Abdel-Latif

Al-Hajji

Faisal

et al. 2019

Sci Rep

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Nd1−xSrxMnO3 nanocomposites perovskites were synthesized using sol gel method at different Sr content x = 0.3, 0.5, 0.7, and 0.9. The photocatalytic performance of the Nd1−xSrxMnO3 nanocomposites for photodegradation of Acridine orange dye (AO) was evaluated over visible light illumination. The single phase of orthorhombic pbnm was formed for x = 0.3 and 0.5; however monoclinic and orthorhombic were observed at x = 0.7 and 0.9. The Energy gap of the Nd1−xSrxMnO3 nanocomposites were estimated for all concentrations to be in the range of 3 ± 0.05 eV. The photocatalytic efficiency of Nd0.3Sr0.7MnO3 nanocomposite was 95% of the initial AO dye concentration within 3 h illumination time. The linear increase of the photodegradation rate was found in our samples as a result of the increase of Sr contents from 0.3 to 0.7wt %. Interestingly, the Nd0.3Sr0.7MnO3 content has the highest degradation rate of AO which is two times faster than undoped NdMnO3. This superior behavior in photocatalytic activity of Nd0.3Sr0.7MnO3 nanocomposite emerges from large surface area, structural anisotropy, and small particle size. These findings shows convincingly that the Nd1−xSrxMnO3 photocatalysts possess great promise for visible light driven photodegradation of AO dye.

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Section: Resultsmentioning

confidence: 99%

Doping Strontium into Neodymium Manganites Nanocomposites for Enhanced Visible light Driven Photocatalysis

Abdel-Latif

Al-Hajji

Faisal

et al. 2019

Sci Rep

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“…Inspired by the achievements of Kudo and co‐workers, a large number of studies have since been conducted to develop NaTaO 3 ‐based photocatalysts that are efficient for artificial photosynthesis, with more than 180 studies, as well as reviews, reported to date . Doping with lanthanoid cations, not limited to La 3+ , and alkaline‐earth metal cations improved the water splitting efficiency (Table ).…”

Section: Introductionmentioning

confidence: 99%

Sodium Tantalate Photocatalysts Doped with Metal Cations: Why Are They Active for Water Splitting?

Ōnishi

2019

ChemSusChem

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Sodium tantalate (NaTaO3) is the first semiconductor photocatalyst that produces hydrogen–oxygen mixed bubbles in the overall water splitting reaction, when appropriately doped with metal cations. A series of studies are reviewed herein to answer the question of why doping with metal cations raised the quantum efficiency of the reaction. Infrared absorption of band‐gap‐excited photocatalysts demonstrated that cation doping reduced the electron–hole recombination rate and the steady‐state population of charge carriers accordingly increased. In‐depth studies are focused on Sr cations incorporated through solid‐state, flux, and hydrothermal reactions. The recombination rate was reduced when Ta cations were exchanged with Sr cations. Sodium cations were simultaneously exchanged to balance the cationic and anionic charges with no need for creating oxygen anion vacancies. NaTaO3Sr(Sr1/3Ta2/3)O3 solid solution was formed as a result of the simultaneous doping. In addition to doping at the appropriate sites, the intraparticle distribution of Sr cations played an essential role to reduce the recombination rate. Strontium cations segregated to produce graded composition from the Sr‐rich surface to the Sr‐poor core. The bottom of the conduction band was raised at the Sr‐rich surface and the excited electrons were driven to the Sr‐poor core, leaving holes at the surface. However, the graded composition had a dual purpose; the excited electron population increased and its fractional contribution to the surface reaction decreased.

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“…11−14 Later, different metal oxide nanoparticles like niobates and tantalates were explored for their photocatalytic activity in water splitting and removal of organic contaminants from water. 15,16 NaTaO 3 , being an important member of tantalate perovskites, has been explored extensively for its photocatalytic water splitting activity due to its stability and structural flexibility. In the NaTaO 3 structure, the corner sharing of TaO 6 octahedron forms a three-dimensional structure with sodium ions at dodecahedral interspaces, which maintains the stability of the NaTaO 3 structure.…”

Section: Introductionmentioning

confidence: 99%

High-Surface-Area Sodium Tantalate Nanoparticles with Enhanced Photocatalytic and Electrical Properties Prepared through Polymeric Citrate Precursor Route

et al. 2019

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NaTaO3 nanoparticles with a high surface area of 46.2 m2/g have been successfully synthesized using a polymeric citrate precursor route. As-prepared nanoparticles were extensively characterized by X-ray diffraction, Fourier transform infrared, transmission emission microscopy, and scanning electron microscopy studies for the analysis of phase purity, crystallinity, and morphology. NaTaO3 nanoparticles show efficient photo-induced removal of the methylene blue dye under sunlight, which were confirmed by using liquid chromatography–mass spectroscopy. 86% dye has been degraded in 200 min at neutral pH, whereas the same amount of dye was decolorized in only 80 min at alkaline pH. Also, the dielectric behavior of the as-prepared nanoparticles at different annealing temperatures was explained by the Maxwell–Wagner polarization mechanism. At 500, 600, and 700 °C annealing temperatures, the dielectric constant and dielectric loss at 500 kHz for the samples were found to be 21.5, 18, and 16 and 0.012, 0.022, and 0.029, respectively. The unsaturated hysteresis loop shows weak ferroelectric behavior of NaTaO3 nanoparticles with remanent and saturation polarizations of 0.0013 and 0.21 μC/cm2, respectively, and S-E hysteresis shows a bipolar strain of 0.10%.

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Fabrication and Photocatalytic Applications of Perovskite Materials with Special Emphasis on Alkali-Metal-Based Niobates and Tantalates

Cited by 61 publications

References 181 publications

Doping Strontium into Neodymium Manganites Nanocomposites for Enhanced Visible light Driven Photocatalysis

Doping Strontium into Neodymium Manganites Nanocomposites for Enhanced Visible light Driven Photocatalysis

Sodium Tantalate Photocatalysts Doped with Metal Cations: Why Are They Active for Water Splitting?

High-Surface-Area Sodium Tantalate Nanoparticles with Enhanced Photocatalytic and Electrical Properties Prepared through Polymeric Citrate Precursor Route

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