Preparation and photocatalytic activity of triangular pyramid NaNbO 3

Yu, Qiaonan; Feng, Zhiyong; Li, Guoqiang; Zhang, Weifeng

doi:10.1016/j.apcatb.2016.06.028

Cited by 22 publications

(7 citation statements)

References 33 publications

(39 reference statements)

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“…Yu and his group (Yu et al 2016) investigated the performance of NaNbO 3 of different morphologies on photocatalytic applications. It was observed that NaNbO 3 nanoparticles of pyramid morphology have higher efficiencies of photo-degradation than that of cubic systems.…”

Section: Photodegradation Performancementioning

confidence: 99%

Engineered magnetic oxides nanoparticles as efficient sorbents for wastewater remediation: a review

et al. 2021

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The rapid urbanization and industrialization is causing worldwide water pollution, calling for advanced cleaning methods. For instance, pollutant adsorption on magnetic oxides is efficient and very practical due to the easy separation from solutions by an magnetic field. Here we review the synthesis and performance of magnetic oxides such as iron oxides, spinel ferrites, and perovskite oxides for water remediation. We present structural, optical, and magnetic properties. Magnetic oxides are also promising photocatalysts for the degradation of organic pollutants. Antimicrobial activities and adsorption of heavy metals and radionucleides are also discussed.

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Section: Photodegradation Performancementioning

confidence: 99%

Engineered magnetic oxides nanoparticles as efficient sorbents for wastewater remediation: a review

et al. 2021

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“…29 Downsizing NaNbO 3 affects the relative proportion of polymorphs. 31,32 It recently attracted interest for size-induced fer-roelectric 33-36 and photocatalytic [37][38][39][40] properties, but also for piezoelectric 41 devices. Substituting potassium for sodium leads to K x Na 1-x NbO 3 , which belongs to the most promising piezoelectrics for the replacement of the current industrial technologies based on hazardous lead titanates and zirconates.…”

Section: Introductionmentioning

confidence: 99%

“…Downsizing NaNbO 3 affects the relative proportion of polymorphs. , It recently attracted interest for size-induced ferroelectric − and photocatalytic − properties but also for piezoelectric devices. Substituting potassium for sodium leads to K x Na 1– x NbO 3 , which belongs to the most promising piezoelectrics for the replacement of the current industrial technologies based on hazardous lead titanates and zirconates. , Polar phases that can be stabilized as sodium cations are partly substituted for lithium (Li x Na 1– x NbO 3 ) and also when fluorine substitutes partially for oxygen (KNaNbOF 5 ). , No Ti-substituted sodium niobate with a polar structure has ever been reported so far.…”

Section: Introductionmentioning

confidence: 99%

High Ionic Conductivity in Oxygen-Deficient Ti-Substituted Sodium Niobates and the Key Role of Structural Features

et al. 2019

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NaNb 1-x Ti x O 3-0.5x (0 < x ≤ 0.15) compounds were prepared using a two-step synthesis involving a hydrothermal route at T = 200 °C in an autoclave followed by heat treatments under air or reductive conditions. Rietveld structural refinements from Xray diffraction data combined with 23 Na and 93 Nb nuclear magnetic resonance evidenced the formation of new complex oxides crystallizing in the P2 1 ma space group. Ti substitution for Nb atoms contributes to stabilize the acentric polymorph rather than the well-known thermodynamically stabilized network (Pbma space group) of sodium niobate. Taking into account the competitive bonds sequences Na1(2)-O1(2)-Nb-O3(4), the large variation of Na1-O1 and Na2-O2 bond lengths after Ti substitution leads to reduce the Nb/Ti-O1 and Nb/Ti-O2 apical distortion (elongation in one direction) and consequently to exalt the distortion in the equatorial plane. Then, the transition metal crystal-field splitting increases as well as the second-order Jahn-Teller effect and the optical band gap red-shifts to visible range starting with low Ti content. Two phase-transition sequences at moderated temperature are characterized by the relaxation of the perovskite framework with various [Nb(Ti)O 6 ] octahedral distortion and tilt modes: from the polar orthorhombic P2 1 ma phase to the centrosymmetric orthorhombic Cmcm network above T = 300 °C and then to the ideal cubic perovskite structure above T = 600°C. The pronounced decrease of phase transition temperature with Ti substitution, especially from P2 1 ma to Cmcm, was correlated to the almost identical stabilities of the two Na sites and the four oxygen positions in P2 1 ma symmetry but also to larger distortion of the transition metal polyhedron enhancing the oxygen mobility. Moreover, the high ionic conductivity of oxygen-deficient NaNb 1-x Ti x O 3-0.5x was evidenced for the first time between 300 and 700 °C (σ ion (T = 300 °C) = 3 10 -5

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“…Gu et al reported that the cubic NaNbO 3 nanowires with 0.5 wt% of Pt cocatalyst could split water to H 2 with quite high efficiency. Yu et al found that the triangular pyramid NaNbO 3 showed superior photocatalytic oxidization activities for 2,4‐dichlorophene and rhodamine B degradation. Li et al demonstrated that cubic NaNbO 3 nanoparticles could be fabricated through the surface coordination modulation, and such a high symmetry structure exhibited excellent performance in both photocatalytic H 2 evolution and CO 2 reduction.…”

Section: Introductionmentioning

confidence: 99%

Double‐hole‐mediated coupling of anionic dopants in perovskite NaNbO₃ for efficient solar water splitting

Wang

Teng

et al. 2019

Int J of Quantum Chemistry

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Doping is an effective strategy to improve the photocatalytic performances of semiconductor photocatalyst for water splitting. In this work, we perform extensive hybrid density functional calculations to investigate perovskite NaNbO3 with anionic monodoping with N, C, P, and S dopants as well as with (N + N), (C + S), and (N + P) codoping pairs. Theoretical results clearly reveal that the band structures of NaNbO3 can be effectively tailored by introducing double‐hole‐mediated coupling of anion‐anion pairs. Compared with the monodoping cases, the anion‐anion codoped NaNbO3 systems not only have substantially narrowed band gaps, but also can eliminate the unoccupied localized states appearing above the Fermi level, which are disastrous for photocatalysis as they may trap the photogenerated carriers. Optical absorption curves further convince that the codoped NaNbO3 can effectively harvest visible light. The band edge positions with respect to the redox potentials of water demonstrate that the (N + N) codoped NaNbO3 are desirable for efficient solar water splitting.

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Preparation and photocatalytic activity of triangular pyramid NaNbO 3

Cited by 22 publications

References 33 publications

Engineered magnetic oxides nanoparticles as efficient sorbents for wastewater remediation: a review

Engineered magnetic oxides nanoparticles as efficient sorbents for wastewater remediation: a review

High Ionic Conductivity in Oxygen-Deficient Ti-Substituted Sodium Niobates and the Key Role of Structural Features

Double‐hole‐mediated coupling of anionic dopants in perovskite NaNbO₃ for efficient solar water splitting

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Preparation and photocatalytic activity of triangular pyramid NaNbO 3

Cited by 22 publications

References 33 publications

Engineered magnetic oxides nanoparticles as efficient sorbents for wastewater remediation: a review

Engineered magnetic oxides nanoparticles as efficient sorbents for wastewater remediation: a review

High Ionic Conductivity in Oxygen-Deficient Ti-Substituted Sodium Niobates and the Key Role of Structural Features

Double‐hole‐mediated coupling of anionic dopants in perovskite NaNbO3 for efficient solar water splitting

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Double‐hole‐mediated coupling of anionic dopants in perovskite NaNbO₃ for efficient solar water splitting