Rational design of MIL-88A(Fe)/Bi2WO6 heterojunctions as an efficient photocatalyst for organic pollutant degradation under visible light irradiation

Li, Qianwen; Li, Limei; Long, Xuanyu; Tu, Yudi; Ling, Lanqing; Gu, Jiabao; Hou, Liwei; Xu, Yuheng; Liu, Nan; Li, Zequan

doi:10.1016/j.optmat.2021.111260

Cited by 38 publications

(15 citation statements)

References 74 publications

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“…The PL spectra of the as-prepared TiO2, BMT-3, and BMT-4 samples in the present study are shown in Figure 4c. The strongest emission intensity peak observed in Photoluminescence (PL) emission spectra have been widely employed to reveal the separation efficiency of the photo-induced electrons and holes in the composite semiconductors [42]. The PL spectra of the as-prepared TiO 2 , BMT-3, and BMT-4 samples in the present study are shown in Figure 4c.…”

Section: Optical Propertiesmentioning

confidence: 78%

“…Photoluminescence (PL) emission spectra have been widely employed to reveal the separation efficiency of the photo-induced electrons and holes in the composite semiconductors [ 42 ]. The PL spectra of the as-prepared TiO 2 , BMT-3, and BMT-4 samples in the present study are shown in Figure 4 c. The strongest emission intensity peak observed in pure TiO 2 nanorods corresponded to the band-gap transition.…”

Section: Resultsmentioning

confidence: 99%

“…The Mott–Schottky plots of TiO 2 and Bi 2 MoO 6 are shown in Figure 6 c. The positive slopes of both compounds imply that they are n-type semiconductors. The flat-band potential ( V fb ) can be calculated by the Mott–Schottky equation [ 42 ]:

where C is the capacitance at the interface with the electrolyte, e is the electronic charge,

is the vacuum permittivity,

is the sample dielectric constant, N d is the charge-carrier concentration, V and V fb are the applied and flat-band potentials, k is the Boltzmann’s constant, and T is the temperature [ 47 ]. The V fb could be calculated from the intercept of the 1/ C 2 curve (plotted as a V function) with the x -axis [ 48 ].…”

Section: Resultsmentioning

confidence: 99%

“…Furthermore, the photogenerated electron-hole pairs were excited due to the extension of absorption into the visible-light region, favoring enhanced PEC and photocatalytic performance. Photoluminescence (PL) emission spectra have been widely employed to reveal the separation efficiency of the photo-induced electrons and holes in the composite semiconductors [42]. The PL spectra of the as-prepared TiO2, BMT-3, and BMT-4 samples in the present study are shown in Figure 4c.…”

Section: Optical Propertiesmentioning

confidence: 85%

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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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Section: Optical Propertiesmentioning

confidence: 78%

Section: Resultsmentioning

confidence: 99%

where C is the capacitance at the interface with the electrolyte, e is the electronic charge,

is the vacuum permittivity,

Section: Resultsmentioning

confidence: 99%

Section: Optical Propertiesmentioning

confidence: 85%

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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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“…(1) A wide range of semiconductors can be coupled with MOFs and then used in the photocatalytic degradation of organic pollutants: TiO 2 , 111,112 other metal oxides, 113 perovskites, 54,114 g-C 3 N 4 , [115][116][117] etc. (2) The heterojunction approach allows for combining the different favorable properties of each compound, extending their absorption range, improving their chemical stability towards photocorrosion, and decreasing the recombination of electron-hole pairs.…”

Section: Creation Of Heterojunctionsmentioning

confidence: 99%

Metal–organic framework‐based heterojunction photocatalysts for organic pollutant degradation: design, construction, and performances

Belousov

Fukina

Koryagin

2022

J of Chemical Tech & Biotech

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Heterogeneous photocatalysis has been considered one of the most attractive alternative routes to transforming naturally abundant, clean, and sustainable solar energy into chemical energy. Nowadays, the most popular heterogeneous photocatalyst, titanium dioxide, has already found applications for water splitting to produce hydrogen and oxygen, for the degradation of organic pollutants, for air purification, and for the creation of self‐cleaning coatings. However, TiO2 has a significant limitation: a large band gap (3.0–3.4 eV) that makes it impossible to use anything other than ultraviolet illumination to initiate photocatalytic processes. With a focus on efficient solar‐energy utilization, the development of new photocatalysts that are sensitive to visible light is an important direction in the theory and practice of heterogeneous photocatalysis. In this regard, the use of metal–organic frameworks (MOFs) is an attractive route; they have emerged as an interesting class of materials for applications in photoreactions due to their flexible tunability in composition, structure, and functional properties, along with their facilitated adsorption towards chemicals and their efficient light absorption. Moreover, they can be composed with other semiconductors to produce heterojunctions (e.g., type‐II, Z‐scheme, and S‐scheme), whose effectiveness in photogenerated charge separation has already been proven by many examples. The present critical review reports progress over the last 5 years in the preparation and activity of metal–organic framework‐based heterojunction photocatalysts for the degradation of organic pollutants. © 2022 Society of Chemical Industry (SCI).

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Theoretical Foundations of Photocatalysis

Belousov

2023

Green Chemistry and Sustainable Technology

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Rational design of MIL-88A(Fe)/Bi2WO6 heterojunctions as an efficient photocatalyst for organic pollutant degradation under visible light irradiation

Cited by 38 publications

References 74 publications

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

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

Metal–organic framework‐based heterojunction photocatalysts for organic pollutant degradation: design, construction, and performances

Theoretical Foundations of Photocatalysis

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