13565-96-3Relevant academic research and scientific papers
Oxide-ion-conducting phases in the Bi2MoO6-Bi 2VO5.5 system
Voronkova,Kharitonova,Rudnitskaya
, p. 1255 - 1259 (2006)
In search of new oxide-ion-conducting phases, we have synthesized a series of Bi2V1-x Mo x O5.5+x/2 ceramic samples, in which the end-members Bi2VO5.5 (x = 0) and Bi2MoO6 (x = 1) are single-layer Aurivillius phases, possess ferroelectric properties, and offer high oxide-ion conductivity. We have determined the phase composition of the samples and have investigated their electrical properties. The results indicate the formation of narrow ranges of Bi2VO5.5-and Bi2MoO6-based solid solutions (0 2VO5.5-or Bi2MoO6-based solid solutions and compounds isostructural with BiVO4 and Bi 6Mo2O15. Molybdenum doping stabilizes the orthorhombic phase β-Bi2VO5.5 to room temperature, but the solid solutions differ little in electric conductivity from Bi 2VO5.5. The conductivity of the Bi2MoO 6-based solid solutions is higher than that of undoped bismuth molybdate by about a factor of 3.
Ultrasound assisted deposition of highly stable self-assembled Bi2MoO6 nanoplates with selective crystal facet engineering as photoanode
Zargazi, Mahboobeh,Entezari, Mohammad H.
, (2020)
The use of crystal facets of photocatalysts is well known as a promising strategy for the design of new photocatalysts with interesting physicochemical features for energy production applications. In this work, Bi2MoO6 thin films were synthesized by two methods, electrodeposition and sonoelectrodeposition. Preferential growth orientation depended on synthesis method. Results suggested that sonoelectrodeposition led to dominate the crystal facet {1 0 0} growth with self-assembled nanoplate morphologies while growth orientation in the {0 1 0} facet was dominant in electrodeposition in the absence of ultrasonic waves. As a highlight result, the {1 0 0} facet shows a smaller band gap, higher photocatalytic water splitting than the {0 1 0} facet. Efficient separation of charge pairs and long life time of photogenerated electrons was observed to be intrinsic features of the {1 0 0} facets. The higher charge transfer was confirmed by a higher photocurrent from linear sweep voltammetry and a smaller Nyquist radius arc. Ultrasound plays a key role in growth orientation and led to a production of homogeneous films with nanoplates which self-assembled together to form a flower-like structure. While in the absence of ultrasound the film has coral-like structure. Highly stable sonoelectrodeposited films exhibited incident photon-to-electron conversion efficiency (IPCE) of 22.4% at the specific wavelength of 500 nm. The sonoelectrodeposition method could act as a promising method for forming new films with specific crystal facet selection and developing as highly efficient photoanodes for PEC water splitting.
Fabrication of a heterostructured Ag/AgCl/Bi2MoO6 plasmonic photocatalyst with efficient visible light activity towards dyes
Yan, Qing,Sun, Meng,Yan, Tao,Li, Mengmeng,Yan, Liangguo,Wei, Dong,Du, Bin
, p. 17245 - 17252 (2015)
A ternary Ag/AgCl/Bi2MoO6 plasmonic photocatalyst was successfully fabricated through a two-step synthesis method. The obtained samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and ultraviolet-visible diffuse reflectance spectroscopy (DRS). The DRS results showed that the visible light absorption of the Ag/AgCl/Bi2MoO6 composite had been greatly enhanced owing to the surface plasmonic resonance (SPR) of Ag0 particles. The SEM and TEM images showed that the obtained flower-like Bi2MoO6 microspheres were composed of nanoplates, on the surface of which Ag/AgCl particles were distributed. In the photocatalytic degradation of dyes, Ag/AgCl/Bi2MoO6 photocatalysts exhibited significantly enhanced activities compared with Bi2MoO6. It was also found that the components of Ag/AgCl/Bi2MoO6 have a great influence on the activity. Controlled experiments proved that the degradation of pollutants over Ag/AgCl/Bi2MoO6 was mainly ascribed to the strong oxidation ability of photo-generated holes. On the basis of band structure analysis and active species trapping experimental results, a photocatalytic mechanism is also proposed. This journal is
KINETICS AND MECHANISM OF SOLID-STATE REACTION BETWEEN BISMUTH (III) OXIDE AND MOLYBDENUM (VI) OXIDE.
Rastogi,Singh,Shukla
, p. 136 - 148 (1982)
The mechanism of the following solid-state reactions between bismuth III oxide and molybdenum (VI) oxide was investigated within the temperature range 400-650 degree C. Two types of experiments, capillary and particle size, were performed to ascertain whether MoO//3 diffuses into Bi//2O//3 or vice versa. These show that molybdenum trioxide diffuses into bismuth oxide grains. If alpha is a fraction of molybdenum trioxide reacted, the kinetics in all five cases are found to be governed by the equation alpha **n equals kt throughout the temperature range, where n and k are constants at a given temperature and t is the time. Both n and k are temperature dependent. The characteristic feature of these reactions is that they proceed to completion.
An anion exchange strategy for construction of a novel Bi2SiO5/Bi2MoO6 heterostructure with enhanced photocatalytic performance
Liu, Di,Wang, Jun,Wang, Yonggang,Zhu, Yongfa
, p. 3278 - 3285 (2018)
Based on the structural similarity and the driving principle of solubility, we successfully constructed heterostructures of Bi2SiO5/Bi2MoO6 through an anion exchange strategy between Bi2MoO6 starting material and incoming SiO32- ions. By tuning the addition amount of incoming SiO32-, the evolution process of the Bi2SiO5/Bi2MoO6 heterostructures involving phase formation, morphology transformation, and changes in specific surface area and optical properties was clearly identified. More importantly, the heterostructured products displayed remarkably enhanced photodegradation activities under UV and visible light irradiation compared to pure Bi2MoO6, which could be mainly ascribed to the relatively high surface areas, the light-harvesting contribution from the Bi2MoO6 component, and effective separation of photo-generated electron - hole pairs driven by the interfacial potential difference in the Bi2SiO5/Bi2MoO6 heterojunctions.
Steering photoinduced charge kinetics: Via anionic group doping in Bi2MoO6 for efficient photocatalytic removal of water organic pollutants
Xing, Yongxing,Zhang, Jing,Liu, Zhiliang,Du, Chunfang
, p. 35883 - 35896 (2017)
In this work, we report a novel anionic group doped Bi2MoO6 with noble metal loading as an excellent photocatalytic material for the efficient photodegradation of organic pollutants, including rhodamine B (RhB) and colorless o-phenylphenol (OPP). Several characterization techniques were conducted to investigate the effect of anionic group doping and noble metal loading on the lattice structure, electronic structure, defect chemistry as well as photocatalytic performance. It's found that CO32- doping in a Bi2MoO6 host matrix led to lattice expansion, local symmetry distortion, oxygen vacancy generation and band gap narrowing from ～2.60 to ～2.31 eV. VB-XPS, Mott-Schottky plots and DFT results indicated that the variation of the band gap energy for Bi2MoO6 mainly originated from the upward shift of the valence band edge, which is attributed to the presence of the midgap states of the C 1s orbital. Noble metals (Au, Ag and Pd) as cocatalysts forcefully improved the photogenerated charge separation. With contributions from the doping effects and cocatalysts, the photocatalytic activity of 0.5% Pd-3C/BMO was robustly enhanced about 5-fold for RhB degradation within 40 min under UV + visible light irradiation and 29-fold for OPP degradation within 120 min under visible light irradiation in comparison with pristine Bi2MoO6, respectively.
Hydrothermal synthesis of Sm-doped Bi2MoO6 and its high photocatalytic performance for the degradation of Rhodamine B
Wang, Min,You, Meiyan,Guo, Pengyao,Tang, Hongyang,Lv, Chunmei,Zhang, Yu,Zhu, Tong,Han, Jin
, p. 739 - 746 (2017)
Serials Sm doped Bi2MoO6 photocatalyts with different Sm contents (xSm-Bi2MoO6, x% = 0.0%, 0.4%, 0.6%, 0.8%, 1.0%, 1.2%) were prepared via hydrothermal method to improve the photocatalytic performance of pure Bi
Enhanced photocatalytic activity of Te-doped Bi2MoO6 under visible light irradiation: Effective separation of photogenerated carriers resulted from inhomogeneous lattice distortion and improved electron capturing ability
Chen, Shuguang,Li, Yuhan,Wu, Zixu,Wu, Baoxin,Li, Haibin,Li, Fujin
, p. 124 - 130 (2017)
Te-doped Bi2MoO6 photocatalyst was hydrothermally synthesized, and nonmetal atoms Te were homogeneously incorporated into Bi2MoO6 lattice with the substitution of Te4+ to Mo6+. With increasing Te-doping concentration in Bi2MoO6, no detectable band-gap narrowing but more and more severe inhomogeneous lattice distortions were determined. The activity of Bi2MoO6 photocatalyst was evaluated through methylene blue degradation under visible light irradiation (λ>410?nm) and was greatly enhanced by Te-doping. When Te-doped Bi2MoO6 was synthesized at Te/Mo molar ratio of 7.5%, a maximum first-order rate constant of methylene blue degradation was obtained. The inhomogeneous lattice distortion generated an internal dipole moment, and the holes generated with the substitution of Te4+ to Mo6+ acted as the capturing centers of photogenerated electrons, thus the effective separation of photogenerated carriers was facilitated to result in a relatively high concentration of holes on the surface of Te-doped Bi2MoO6 to be favorable for the efficient methylene blue degradation.
Microwave dielectric properties of low temperature firing Bi 2Mo2O9 ceramic
Zhou, Di,Wang, Hong,Yao, Xi,Pang, Li-Xia
, p. 3419 - 3422 (2008)
Preparation, phase stability, sintering behavior, microwave dielectric properties of single-phase Bi2Mo2O9 ceramic and its chemical compatibility with Ag have been investigated. The single-phase Bi2Mo2O9 ceramic can be well densified in the temperature range from 620° to 645°C with relative density about 96%. X-ray diffraction data show that Bi2Mo2O9 has a monoclinic structure (P21/n), with lattice parameters a=11.9664 Aa, b=10.8089 Aa, and c=11.8871 Aa. When sintering temperature ≥650°C, Bi2Mo3O12 appears as a secondary phase. Pure monoclinic Bi2Mo2O9 ceramic sintered at 620°C for 2 h exhibits good microwave dielectric properties with permittivity about 38, Qf value about 12 500 GHz and temperature coefficient of resonant frequency about +31ppm/°C. The permittivity of single-phase Bi2Mo2O9 corrected for porosity is about 40.17. However, the reaction between Bi 2Mo2O9 and Ag will affect its further application in low-temperature cofired ceramic.
Catalytic and Surface-structural Investigations of Bismuth Molybdate Selective-oxidation Catalysts
Mitchell, Antony G.,Lyne, Peter M.,Scott, Kevin F.,Phillips, Courtenay S. G.
, p. 2417 - 2428 (1981)
In a project designed to study the relation between structural features and the activity with which metal oxides catalyse the oxidation of hydrocarbons the bismuth molybdate system has been examined in detail.Catalytic studies have been carried out using a variety of chromatographic methods on a microreactor scale.Catalysts were made by both low-temperature precipitation and high-temperature fusion of oxides, introducing deliberate stoichiometric changes particularly in the region of Bi:Mo ratio 2:1.X-ray diffraction and ESCA have been used to obtain detailed information on both the bulk and surface structures of the catalysts.Investigations into the catalytic oxidation of but-1-ene to butadiene and propene to acrolein have shown profound changes in activity with only slight changes in stoichiometry near the koechlinite phase (Bi2MoO6) composition.Reduction and reoxidation of samples containing a slight excess of bismuth in this composition region reveal dramatic changes in catalytic properties that can be directly related to changes in surface stoichiometry.The results show that the catalytic properties of bismuth molybdates are very sensitive to the composition of the surface which in turn is critically dependent on the bulk stoichiometry.
