Facile preparation of ultrathin Bi2MoO6 nanosheets for photocatalytic oxidation of toluene to benzaldehyde under visible light irradiation

Cai, Kai; Lv, Siyuan; Song, Luna; Chen, Lang; He, Jie; Chen, Peng; Au, Chak Tong; Yin, Shuang‐Feng

doi:10.1016/j.jssc.2018.09.027

Cited by 44 publications

(32 citation statements)

References 23 publications

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“…Heterogeneous photocatalysis is regarded as one of the most attractive and promising alternatives in selective activation of C–H bonds because it was commonly conducted at room temperature and using green solar energy as driven source. − However, it is still a big challenge to develop efficient photocatalysts that are high in activity, selectivity as well as stability under visible-light irradiation. So far, photocatalysts such as TiO 2 , In 2 S 3 , CdS, g-C 3 N 4 , Bi 2 WO 6 , Bi 2 MoO 6 , and materials based on them − were applied for selective oxidation of aromatic alkanes and/or alkanes in the presence of O 2 as a green oxidant. However, the application of these photocatalysts is severely restricted owing to the need of ultraviolet light, as well as the serious recombination of hole–electron pairs and low stability of catalysts.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of TiO₂/Bi₂MoO₆ Composite for Partial Oxidation of Aromatic Alkanes under Visible-Light Illumination

Song

Ding

Yang

et al. 2018

ACS Sustainable Chem. Eng.

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Novel TiO 2 /Bi 2 MoO 6 heterostructures with TiO 2 particles loaded on a Bi 2 MoO 6 sheet were fabricated by a simple solvothermal process. A series of characterization techniques such as SEM, TEM, XRD, XPS, UV−vis DRS, and electrochemical impedance approach were used to study the physicochemical properties of the as-prepared materials. The TiO 2 /Bi 2 MoO 6 composites were used for partial oxidation of aromatic alkanes into benzaldehyde and its derivatives using O 2 as an oxidant under the irradiation of visible light. At a TiO 2 -to-Bi 2 MoO 6 molar ratio of 0.10, the composite exhibits excellent performance with benzaldehyde production rate being 1036.8 μmol•g −1 •h −1 . The outstanding performance is ascribed to enhanced separation of charge carriers by loading TiO 2 nanoparticles. The as-prepared composites are reusable photocatalysts for partial oxidation of aromatic alkanes under ambient conditions.

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Section: Introductionmentioning

confidence: 99%

Synthesis of TiO₂/Bi₂MoO₆ Composite for Partial Oxidation of Aromatic Alkanes under Visible-Light Illumination

Song

Ding

Yang

et al. 2018

ACS Sustainable Chem. Eng.

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“…À . Yin and co-workers also reported the highly selective oxidation of toluene under visible light irradiation and solvent-free conditions using flower-like Bi 2 WO 6 , [104] thin Bi 2 MoO 6 nanosheets, [40] Bi self-doped Bi 2 MoO 6 À Bi 2 Mo 3 O 12 , [105] BiVO 4 /Ag/C 3 N 4 , [106] and CdSÀ ZnS [107] photocatalysts ( Figure 10). The photogenerated electrons in the conduction band of the photocatalysts react with adsorbed O 2 to generate * O 2 À .…”

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confidence: 98%

Recent Advances in Heterogeneous Photo‐Driven Oxidation of Organic Molecules by Reactive Oxygen Species

et al. 2020

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The photo-driven oxidation of organic molecules into corresponding high-value-added products has become a promising method in chemical synthesis. This strategy can drive thermodynamically non-spontaneous reactions and achieve challenging thermocatalytic processes under ambient conditions. Reactive oxygen species (ROS) are not only significant intermediates for producing target products via photoinduced oxidation reactions but also contribute to the creation of sustainable chemical processes. Here, the latest advances in heterogeneous photo-driven oxidation reactions involving ROS are summarized. The major types of ROS and their generation are introduced, and the behaviors of various ROS involved in photo-driven processes are reviewed in terms of the formation of different bonds. Emphasis is placed on unraveling the reaction mechanisms of ROS and establishing strategies for their regulation, and the remaining challenges and perspectives are summarized and analyzed. This Review is expected to provide an in-depth understanding of the mechanisms of ROS involved in photo-driven oxidation processes as an important foundation for the design of efficient catalysts. Clarifying the role of ROS in oxidation reactions has important scientific significance for improving the atomic and energy efficiency of reactions in practical applications.

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“…Thus, Bi in Bi 2 MoO 6 /TiO 2 existed as Bi 3+ . Two strong peaks at 232.3 and 235.5 eV, corresponding to Mo 3 d 5/2 and Mo 3 d 3/2 spin-orbit components of Mo 6+ , respectively [ 39 ] (see Figure 2 c), were observed in the high-resolution Mo 3 d XPS spectrum. The peaks at 457.5 and 463.2 eV matched the binding energies of Ti 2 p 3/2 and Ti 2 p 1/2 states, respectively (see Figure 2 d).…”

Section: Resultsmentioning

confidence: 99%

Fabrication of Bi2MoO6 Nanosheets/TiO2 Nanorod Arrays Heterostructures for Enhanced Photocatalytic Performance under Visible-Light Irradiation

Zhou

et al. 2022

Nanomaterials

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Bi2MoO6/TiO2 heterostructures (HSs) were synthesized in the present study by growing Bi2MoO6 nanosheets on vertically aligned TiO2 nanorod arrays using a two-step solvothermal method. Their morphology and structure were characterized by scanning electron microscopy (SEM) and X-ray diffraction (XRD), respectively. Excellent visible-light absorption was observed by UV–Vis absorption spectroscopy, which was attributed to the presence of the Bi2MoO6 nanosheets with a narrow-band-gap. The specific surface area and pore volume of the photocatalysts were significantly increased due to the hierarchical structure composed of Bi2MoO6 nanosheets and TiO2 nanorods. The photoluminescence and photoelectrochemical characterizations showed improved separation and collection efficiency of the Bi2MoO6/TiO2 HSs towards the interface charge carrier. The photocatalytic analysis of the Bi2MoO6/TiO2 HSs demonstrated a significantly better methylene blue (MB) degradation efficiency of 95% within 3 h than pristine TiO2 nanorod arrays under visible-light irradiation. After three photocatalytic cycles, the degradation rate remained at ~90%. The improved performance of the Bi2MoO6/TiO2 HSs was attributed to the synergy among the extended absorption of visible light; the large, specific surface area of the hierarchical structure; and the enhanced separation efficiency of the photogenerated electron-hole pairs. Finally, we also established the Bi2MoO6/TiO2 HSs band structure and described the photocatalytic dye degradation mechanism. The related electrochemical analysis and free-radical trapping experiments indicated that h+, ·O2− and ·OH have significant effects on the degradation process.

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Facile preparation of ultrathin Bi2MoO6 nanosheets for photocatalytic oxidation of toluene to benzaldehyde under visible light irradiation

Cited by 44 publications

References 23 publications

Synthesis of TiO₂/Bi₂MoO₆ Composite for Partial Oxidation of Aromatic Alkanes under Visible-Light Illumination

Synthesis of TiO₂/Bi₂MoO₆ Composite for Partial Oxidation of Aromatic Alkanes under Visible-Light Illumination

Recent Advances in Heterogeneous Photo‐Driven Oxidation of Organic Molecules by Reactive Oxygen Species

Fabrication of Bi2MoO6 Nanosheets/TiO2 Nanorod Arrays Heterostructures for Enhanced Photocatalytic Performance under Visible-Light Irradiation

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Facile preparation of ultrathin Bi2MoO6 nanosheets for photocatalytic oxidation of toluene to benzaldehyde under visible light irradiation

Cited by 44 publications

References 23 publications

Synthesis of TiO2/Bi2MoO6 Composite for Partial Oxidation of Aromatic Alkanes under Visible-Light Illumination

Synthesis of TiO2/Bi2MoO6 Composite for Partial Oxidation of Aromatic Alkanes under Visible-Light Illumination

Recent Advances in Heterogeneous Photo‐Driven Oxidation of Organic Molecules by Reactive Oxygen Species

Fabrication of Bi2MoO6 Nanosheets/TiO2 Nanorod Arrays Heterostructures for Enhanced Photocatalytic Performance under Visible-Light Irradiation

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Synthesis of TiO₂/Bi₂MoO₆ Composite for Partial Oxidation of Aromatic Alkanes under Visible-Light Illumination

Synthesis of TiO₂/Bi₂MoO₆ Composite for Partial Oxidation of Aromatic Alkanes under Visible-Light Illumination