Controllable synthesis of Bi2MoO6 and effect of morphology and variation in local structure on photocatalytic activities

Zhang, Liwu; Xu, Tongguang; Zhao, Xu; Zhu, Yongfa

doi:10.1016/j.apcatb.2010.05.022

Cited by 466 publications

(231 citation statements)

References 28 publications

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“…This is in agreement with Li et al [36] and Zhang et al [40], who also reported that hydrothermal synthesis with Bi/Mo = 2/1 always resulted in γ-Bi2MoO6 independent of the pH value (pH = 1-13). …”

Section: Variation Of the Bi/mo Ratiosupporting

confidence: 82%

“…α-Bi2Mo3O12 (monoclinic, defective fluorite structure) and γ-Bi2MoO6 (orthorhombic, layered Aurivillius-type structure) have been successfully synthesized by a one-step synthesis under hydrothermal conditions applying different precursors and various synthesis conditions [32,33,36,40,41]. For the preparation of metastable, monoclinic β-Bi2Mo2O9 the precursors were applied in the ratio Bi/Mo = 1/1 leading to a phase mixture which had to be further calcined at 560 °C to obtain crystalline β-bismuth molybdate [33,36].…”

Section: Introductionmentioning

confidence: 99%

“…Hydrothermally synthesized bismuth molybdates were mostly applied in photocatalysis under visible light irradiation [36,40,43], where, especially, γ-Bi2MoO6 is attractive due to its layered structure. Although the controlled preparation of unsupported bismuth molybdate catalysts exposing a high surface area under mild conditions seems very attractive for the selective oxidation of olefins, hydrothermally prepared ones have hardly been applied in oxidation reactions.…”

Section: Introductionmentioning

confidence: 99%

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Bismuth Molybdate Catalysts Prepared by Mild Hydrothermal Synthesis: Influence of pH on the Selective Oxidation of Propylene

et al. 2015

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A series of bismuth molybdate catalysts with relatively high surface area was prepared via mild hydrothermal synthesis. Variation of the pH value and Bi/Mo ratio during the synthesis allowed tuning of the crystalline Bi-Mo oxide phases, as determined by X-ray diffraction (XRD) and Raman spectroscopy. The pH value during synthesis had a strong influence on the catalytic performance. Synthesis using a Bi/Mo ratio of 1/1 at pH ≥ 6 resulted in γ-Bi2MoO6, which exhibited a better catalytic performance than phase mixtures obtained at lower pH values. However, a significantly lower catalytic activity was observed at pH = 9 due to the low specific surface area. γ-Bi2MoO6 synthesized with Bi/Mo = 1/1 at pH = 6 and 7 exhibited relatively high surface areas and the best catalytic performance. All OPEN ACCESSCatalysts 2015, 5 1555 samples prepared with Bi/Mo = 1/1, except samples synthesized at pH = 1 and 9, showed better catalytic performance than samples synthesized with Bi/Mo = 2/3 at pH = 4 and 9 and γ-Bi2MoO6 synthesized by co-precipitation at pH = 7. At temperatures above 440 °C, the catalytic activity of the hydrothermally synthesized bismuth molybdates started to decrease due to sintering and loss of surface area. These results support that a combination of the required bismuth molybdate phase and a high specific surface area is crucial for a good performance in the selective oxidation of propylene.

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Section: Variation Of the Bi/mo Ratiosupporting

confidence: 82%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Bismuth Molybdate Catalysts Prepared by Mild Hydrothermal Synthesis: Influence of pH on the Selective Oxidation of Propylene

et al. 2015

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“…Fig.3 shows FT-IR spectra of as-synthesized Bi 2 MoO 6 products. The bands at around 843 and796 cm -1 can beassigned as the asymmetric and symmetric stretching mode of MoO 6 involving vibrations of the apical oxygen atoms,respectively.The band at 728 cm -1 is attributed to the asymmetric stretching mode of MoO 6 involving vibrations of the equatorial oxygen atoms 11 . The bands in the 600-400 cm -1 range are assigned to Bi-O stretching vibration and deformation vibration.…”

Section: 3photocatalytic Testmentioning

confidence: 99%

Controllable Growth of Bi₂MoO₆Nanoplates by Citric Acid Assisted Hydrothermal Process and Their Photocatalytic Properties

Wang

2016

MATEC Web Conf.

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Abstract. Bi 2 MoO 6 nanoplates with different sizes have been controllably fabricated by citric acid (CA) assisted hydrothermal process. The effects of CA on the morphology of Bi 2 MoO 6 nanoplates have also been investigated. It is found that CA has a critical role in the crystallinity and size of Bi 2 MoO 6 nanoplates. On the basis of XRD analysis and SEM observation of the products, the mechanism for CA assisted hydrothermal synthesis of the Bi 2 MoO 6 nanoplates is discussed. The photocatalytic activity of as-prepared Bi 2 MoO 6 was evaluated by the degradation of RhB dye in water, and the sample prepared when the amount of CA was 2.5mmol exhibited the highest photocatalytic activity.

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“…A group of bismuth inorganic compounds such as Bi 2 O 3 , BiVO 4 , BIMEVOX, BiMoO 6 , BiOCl, and Bi 2 WO 6 are known to act as electrode materials, exhibiting high electrical capacity, chemical stability under multiple polarization cycles, photoelectroactivity, and photocatalytical properties [6][7][8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Does the low optical band gap of yellow Bi3YO6 guarantee the photocatalytical activity under visible light illumination?

Trzciński

Szkoda

Herman

et al. 2018

J Solid State Electrochem

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Bi 3 YO 6 , which is known as an ionic conductor, was tested here as an electrode and photoanode in contact with aqueous electrolytes. Bi 3 YO 6 was deposited onto the Pt substrate and the such prepared electrode was polarized in various aqueous electrolytes. The optical energy band gap of the material equal to 1.89 eV was determined using the Kubelka-Munk function resulting from the UV-Vis spectrum (allowed indirect transition) and also was calculated using the semi-empirical PM7 method (3.38 eV of HOMO-LUMO energy gap). Despite the yellow color of Bi 3 YO 6 , the tested material exhibits photoelectroactivity only in the UV range of electromagnetic radiation. The anodic photocurrent characteristic for n-type metal oxide semiconductors was recorded. The electrode exhibits diffusion-controlled cathodic activity while polarized in chloride-free aqueous electrolytes.

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Controllable synthesis of Bi2MoO6 and effect of morphology and variation in local structure on photocatalytic activities

Cited by 466 publications

References 28 publications

Bismuth Molybdate Catalysts Prepared by Mild Hydrothermal Synthesis: Influence of pH on the Selective Oxidation of Propylene

Bismuth Molybdate Catalysts Prepared by Mild Hydrothermal Synthesis: Influence of pH on the Selective Oxidation of Propylene

Controllable Growth of Bi₂MoO₆Nanoplates by Citric Acid Assisted Hydrothermal Process and Their Photocatalytic Properties

Does the low optical band gap of yellow Bi3YO6 guarantee the photocatalytical activity under visible light illumination?

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Controllable synthesis of Bi2MoO6 and effect of morphology and variation in local structure on photocatalytic activities

Cited by 466 publications

References 28 publications

Bismuth Molybdate Catalysts Prepared by Mild Hydrothermal Synthesis: Influence of pH on the Selective Oxidation of Propylene

Bismuth Molybdate Catalysts Prepared by Mild Hydrothermal Synthesis: Influence of pH on the Selective Oxidation of Propylene

Controllable Growth of Bi2MoO6Nanoplates by Citric Acid Assisted Hydrothermal Process and Their Photocatalytic Properties

Does the low optical band gap of yellow Bi3YO6 guarantee the photocatalytical activity under visible light illumination?

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Controllable Growth of Bi₂MoO₆Nanoplates by Citric Acid Assisted Hydrothermal Process and Their Photocatalytic Properties