Hydrothermal Synthesis and Characterization of Bi2MoO6 Nanoplates and Their Photocatalytic Activities

Phuruangrat, Anukorn; Jitrou, Pimchanok; Dumrongrojthanath, Phattharanit; Ekthammathat, Nuengruethai; Kuntalue, Budsabong; Thongtem, Somchai; Thongtem, Titipun

doi:10.1155/2013/789705

Cited by 43 publications

(28 citation statements)

References 37 publications

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“…2. Comparison of these patterns with those in the literature shows that each material is a pure phase [25,26]. Bi 4 V 2 O 11 is stable in the ␣-phase polymorph for temperatures of below 723 K, and therefore the diffraction pattern for this material is assigned to ␣-Bi 4 V 2 O 11 .…”

Section: Catalyst Characterizationmentioning

confidence: 62%

Effects of catalyst crystal structure on the oxidation of propene to acrolein

et al. 2016

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Please cite this article in press as: Z. Zhai, et al., Effects of catalyst crystal structure on the oxidation of propene to acrolein, Catal. Today (2015), http://dx.a b s t r a c t Bismuth molybdate is known to be active for the oxidation of propene to acrolein and its activity can be altered by substitution of other elements (e.g. Fe, V, W) into the scheelite phase of ␣-Bi 2 Mo 3 O 12 . This work has further revealed that the apparent activation energy for acrolein formation correlates with the band gap of the catalyst measured at reaction temperature. It is, therefore, of interest to establish to how the crystal structure of the catalyst affects the activation energy. We report here an investigation of propene oxidation conducted over Bi, Mo, V oxides having the aurivillius structure with the composition Bi 4 V 2-x Mo x O 11+x/2 (x = 0−1) and compare them with oxides having the scheelite structure with the composition Bi 2-x/3 Mo x V 1-x O 12 (x = 0−1). The aurivillius-phase catalysts again show a correlation between the apparent activation energy and the band gap of the oxide, and the only difference being that for a given band gap, the apparent activation energy for the aurivillius-phase catalysts is 1.5 kcal/mol higher than that for the scheelite-phase catalysts. This difference is attributed to the lower heat of propene adsorption on the aurivillius-phase catalysts. A further finding is that for catalysts with band gaps greater than ∼2.1 eV, the acrolein selectivity is ∼75% for the conditions used and independent of the propene conversion. When the band gap falls below ∼2.1 eV, the intrinsic selectivity to acrolein decreases rapidly and then decreases further with increasing propene conversion. This pattern shows that when the activity of oxygen atoms at the catalyst surface becomes very high, two processes become more rapid -the oxidation of the intermediate from which acrolein is formed and the sequential combustion of acrolein to CO 2 .

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Section: Catalyst Characterizationmentioning

confidence: 62%

Effects of catalyst crystal structure on the oxidation of propene to acrolein

et al. 2016

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“…2: The Raman spectra of γ-Bi2MoO6 nanoparticles shown in Fig. 2, which [40,41]. The peaks at 1626 and 1383 cm -1 in the FT-IR spectrum of the sample are assigned to the vibration of O-H stretching to the adsorbed water molecule to the sample.…”

Section: Resultsmentioning

confidence: 99%

Synthesis of g-Bi2MoO6 by Co-precipitation Method and Evaluation for Photocatalytic Degradation of Rhodamine B, Crystal Violet and Orange II Dyes Under Visible Light Irradiation

Banavatu¹,

Rao²,

Basavaiah³

2017

Asian J. Chem.

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γ-Bismuth molybdate (γ-Bi2MoO6) catalyst has been successfully synthesized by co-precipitation method and followed by calcination using stoichiometry ratio of bismuth nitrate, nitric acid, ammonium molybdate as precursor materials. The synthesized γ-Bi2MoO6 nanoparticles characterized by X-ray diffraction for identifying crystalline phases and particle size, Raman spectroscopy identifies active species during the reaction, Fourier transform infrared spectroscopy is to identify adsorbed species and to study the way in which these species are chemisorbed at the surface of the catalyst, UV-visible diffuse reflectance spectroscopy (UV-DRS) revealed for band energy of semiconductors, Field emission scanning electron microscopy (FE-SEM) is to determine morphology and shape of supported particles and Energy dispersive X-ray analysis (EDX) is for elemental analysis of synthesized nanoparticles. The photocatalytic activity of γ− Bi2MoO6 catalyst evaluated using the degradation of Rhodamine-B, Crystal Violet and Orange II dyes under visible light irradiation at room temperature.

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“…where k is the apparent rate constant [7,8,12,15], calculated from slope of the degradation regression line of pure Bi 2 MoO 6 , pure Ag 3 PO 4 and Ag 3 PO 4 /Bi 2 MoO 6 nanocomposites [ Fig. 4(c)].…”

Section: Resultsmentioning

confidence: 99%

Photodegradation of rhodamine B by Ag3PO4/Bi2MoO6 nanocomposites under visible light illumination

Sitthichai

Phuruangrat

Kuntalue

et al. 2017

J. Ceram. Soc. Japan

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Heterostructure Ag 3 PO 4 /Bi 2 MoO 6 nanocomposites were synthesized by a depositionprecipitation method at high temperature and pressure. The as-synthesized products were characterized by X-ray diffraction, transmission electron microscopy and X-ray photoelectron spectroscopy. In this research, cubic Ag 3 PO 4 nanoparticles were deposited on orthorhombic Bi 2 MoO 6 nanoplates. For 10.0 wt % Ag 3 PO 4 loading, the Ag 3 PO 4 nanoparticles with 510 nm in size were detected across the surface of Bi 2 MoO 6 nanoplates. The effect of Ag 3 PO 4 content on the photocatalytic properties was investigated by evaluating the degradation of rhodamine B under visible white light. The Ag 3 PO 4 /Bi 2 MoO 6 nanocomposites exhibited more enhanced photocatalytic activity than the pure Bi 2 MoO 6 . Electronhole diffusion in Ag 3 PO 4 /Bi 2 MoO 6 nanocomposites and photodegradation mechanism of rhodamine B were also discussed in this report.

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Hydrothermal Synthesis and Characterization of Bi₂MoO₆ Nanoplates and Their Photocatalytic Activities

Cited by 43 publications

References 37 publications

Effects of catalyst crystal structure on the oxidation of propene to acrolein

Effects of catalyst crystal structure on the oxidation of propene to acrolein

Synthesis of g-Bi2MoO6 by Co-precipitation Method and Evaluation for Photocatalytic Degradation of Rhodamine B, Crystal Violet and Orange II Dyes Under Visible Light Irradiation

Photodegradation of rhodamine B by Ag<sub>3</sub>PO<sub>4</sub>/Bi<sub>2</sub>MoO<sub>6</sub> nanocomposites under visible light illumination

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