Journal ArticleDOI
Preparation, Characterization, and Photocatalytic Properties of CaNb2O6 Nanoparticles
TLDR
In this article, CaNb2O6 nanoparticles with a size range of 30-50 nm were synthesized by heat treatment at 600°C after a solvothermal process and their optical and photocatalytic properties were investigated.Abstract:
CaNb2O6 nanoparticles with a size range of 30–50 nm were synthesized by heat treatment at 600°C after a solvothermal process and their optical and photocatalytic properties were investigated. The prepared powders were characterized by X-ray powder diffractometer, field-emission scanning electron microscope, transmission electron microscope, UV-Vis diffuse reflectance spectroscopy, Fluorescence spectroscopy, and Raman spectroscopy. Compared with a powder of the same material prepared by a solid-state reaction (SS) method, the nanoparticles exhibited a higher Brunauer–Emmett–Teller (BET) surface area, more efficient light absorption, and enhanced photocatalytic activity for producing H2 from pure water under UV irradiation. The photoluminescence spectra revealed that a radiative recombination process is dominant in the powder prepared by the SS method (strong blue emission at 300 K) under UV light irradiation, while no obvious emission was observed in the nanoparticles. This decrease of the radiative recombination as well as the higher optical absorption ability and higher BET surface area resulting from the reduced dimensionality led to enhanced photocatalytic activity of the nanoparticles.read more
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Niobium oxides and niobates physical properties: Review and prospects
TL;DR: In this paper, a short review on different types of niobates, namely columbite and rare earth, and the relation of the properties of these materials with niobium oxides is presented.
Journal ArticleDOI
Effects of crystal and electronic structures of ANb2O6 (A=Ca, Sr, Ba) metaniobate compounds on their photocatalytic H2 evolution from pure water
TL;DR: In this paper, the authors used X-ray diffraction, field-emission electron microscopy (FE-SEM), and UV-vis diffuse reflectance spectroscopy, and fluorescence spectra to investigate the electronic band structures and photocatalytic activities of alkali-earth metaniobate compounds.
Journal ArticleDOI
Hydrothermal Synthesis of a CaNb2O6 Hierarchical Micro/Nanostructure and Its Enhanced Photocatalytic Activity
Yingwei Zhang,Chao Liu,Guangsheng Pang,Shihui Jiao,Shiyao Zhu,Dong Wang,Daxin Liang,Shouhua Feng +7 more
TL;DR: In this article, a hierarchical micro/nanostructure was successfully fabricated under mild hydrothermal conditions in the absence of templates or organic additives, and the hierarchical structure exhibited a stronger enhancement of photocatalytic activity in the degradation of rhodamine B (RhB) than other morphological CaNb 2 O 6 samples, such as nanoparticles, nanoribbons, and microneedles.
Journal ArticleDOI
Bioactivity and structural properties of nanostructured bulk composites containing Nb2O5 and natural hydroxyapatite
TL;DR: In this article, the authors investigated the bioactivity and structural properties of nanostructured bulk composites that are composed of Nb2O5 and natural hydroxyapatite (HAp) and are produced by mechanical alloying and powder metallurgy.
Journal ArticleDOI
Synthesis, characterization and photocatalytic properties of CaNb2O6 with ellipsoid-like plate morphology
TL;DR: In this article, ellipsoid-like two-dimensional (2D) plates of calcium niobate (CaNb 2 O 6 ) were synthesized via the hydrothermal route without any surfactants or templates by controlling the reaction conditions, viz. pH value, reaction time and temperature.
References
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Self-Assembled Vanadium Pentoxide (V2O5) Hollow Microspheres from Nanorods and Their Application in Lithium-Ion Batteries
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Effects of Structural Variation on the Photocatalytic Performance of Hydrothermally Synthesized BiVO4
Jianqiang Yu,Akihiko Kudo +1 more
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TiO2-Assisted Photodegradation of Dyes. 9. Photooxidation of a Squarylium Cyanine Dye in Aqueous Dispersions under Visible Light Irradiation
TL;DR: In this article, the TiO2-assisted photodegradation of a squarylium cyanine dye (SQ) was examined under visible light irradiation (λ ≥ 430 nm) by UV−vis, proton-NMR, ESR, and GC-MS spectroscopies, by peroxide assays in the presence of peroxidase and catalase enzymes, and by chemical oxygen demand (COD) methods.