Design and development of a novel BiFeO 3 /CuWO 4 heterojunction with enhanced photocatalytic performance for the degradation of organic dyes

Ramezanalizadeh, Hamed; Manteghi, Faranak

doi:10.1016/j.jphotochem.2017.02.004

Cited by 54 publications

(18 citation statements)

References 36 publications

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“…Also, it was noted a shoulder at 631 cm À1 [A u mode], which cannot be attributed to optical modes [94] Table 3. As expected in this table, our experimental IR-active vibrational modes are in good agreement with the results verified in other papers [41,[94][95][96][97]. In addition, we have noted that some of these infrared vibrational modes of CuWO 4 nanocrystals are similar to isostructural CuMoO 4 crystals [98].…”

Section: Ft-ir Spectroscopy Analysessupporting

confidence: 92%

“…This behavior is explained by the low symmetry of CuWO 4 lattice and phonon pattern associated with each mode that is in general complex and involves the whole unit cell [94]. However, the atom dynamics associated to highest energy modes can be understood on the basis of the main atomic shifts [94,95]. The band located at around 910 cm À1 is related to symmetric stretching vibrations ( O W?O?)…”

Section: Ft-ir Spectroscopy Analysesmentioning

confidence: 99%

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Structural evolution, growth mechanism and photoluminescence properties of CuWO4 nanocrystals

Souza

Sczancoski

Nogueira

et al. 2017

Ultrasonics Sonochemistry

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Copper tungstate (CuWO) crystals were synthesized by the sonochemistry (SC) method, and then, heat treated in a conventional furnace at different temperatures for 1h. The structural evolution, growth mechanism and photoluminescence (PL) properties of these crystals were thoroughly investigated. X-ray diffraction patterns, micro-Raman spectra and Fourier transformed infrared spectra indicated that crystals heat treated and 100°C and 200°C have water molecules in their lattice (copper tungstate dihydrate (CuWO·2HO) with monoclinic structure), when the crystals are calcinated at 300°C have the presence of two phase (CuWO·2HO and CuWO), while the others heat treated at 400°C and 500°C have a single CuWO triclinic structure. Field emission scanning electron microscopy revealed a change in the morphological features of these crystals with the increase of the heat treatment temperature. Transmission electron microscopy (TEM), high resolution-TEM images and selected area electron diffraction were employed to examine the shape, size and structure of these crystals. Ultraviolet-Visible spectra evidenced a decrease of band gap values with the increase of the temperature, which were correlated with the reduction of intermediary energy levels within the band gap. The intense photoluminescence (PL) emission was detected for the sample heat treat at 300°C for 1h, which have a mixture of CuWO·2HO and CuWO phases. Therefore, there is a synergic effect between the intermediary energy levels arising from these two phases during the electronic transitions responsible for PL emissions.

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Section: Ft-ir Spectroscopy Analysessupporting

confidence: 92%

Section: Ft-ir Spectroscopy Analysesmentioning

confidence: 99%

Structural evolution, growth mechanism and photoluminescence properties of CuWO4 nanocrystals

Souza

Sczancoski

Nogueira

et al. 2017

Ultrasonics Sonochemistry

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“…Out of many ferrites, BiFeO 3 (BFO) having a typical perovskite-like framework stands at the top with its high chemical stability, visible light absorbing ability, and specific ferro electromagnetic properties. − One of the underlying characteristics of BFO, which makes BFO a budding candidate for photocatalysis, is its polarization effect, which causes band bending, resulting in effective separation of excitons. , However, besides all these attractive features, BFO still suffers from certain limitations such as low conduction band potential and less active surface exposure that limit its commercialization . To neutralize these shortcomings and enhance the light stimulated surface reaction of BFO, various advanced methods were implemented such as noble metal loading, metal/non-metal doping, and making a heterojunction and composite with carbon allotropes or other materials. − ,, Additionally, a number of articles have been published, e.g., Zhu et al reported a BiFeO 3 -based TiO 2 nanotube array with enhanced photoelectrochemical properties, which is due to the synergistic effect leading to a reduction in the pace of exciton recombination by the applied bias and wider optical absorbance property of the BiFeO 3 component . Similarly, Quynh et al delicately developed a self-assembled BFO-FO heterostructure with a high interface to volume ratio that tunes the band structure and displays remarkable PEC activity .…”

Section: Introductionmentioning

confidence: 99%

Efficient Photon Conversion via Double Charge Dynamics CeO₂–BiFeO₃ p–n Heterojunction Photocatalyst Promising toward N₂ Fixation and Phenol–Cr(VI) Detoxification

et al. 2020

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For better exciton separation and high catalytic activity, the most trailblazing stratagem is to construct defect engineered low-dimensional p−n heterojunction framed photocatalytic systems. In this context, we have developed a rod−sheet (1D−2D) p−n heterojunction of MCeO 2 −BiFeO 3 by a simple hydrothermal method and scrutinized its photocatalytic performance toward N 2 fixation and phenol/Cr(VI) detoxification. The intimate contact between MCeO 2 and BiFeO 3 in the junction material is well established via X-ray diffraction (XRD), UV−vis diffuse reflectance spectrosopy (DRS), transmission electron microscopy (TEM), and photoelectrochemical studies. Further, scanning electron microscopy (SEM) and TEM pictures clearly support the decoration of MCeO 2 nanorods over BiFeO 3 sheets and also depict the junction boundary. Additionally, photoluminescence (PL), electron paramagnetic resonance (EPR), X-ray photoelectron spectroscopy (XPS), and Raman measurements give solid evidence toward the presence of an oxygen vacancy. Moreover, the Mott−Schottky result indicates a feasible band edge potential favoring the p−n heterojunction with a built-in electric field between BiFeO 3 and MCeO 2 favoring a double charge dynamic. The MCeO 2 −BFO p−n junction displays a notable catalytic activity, i.e., 98.2% Cr(VI) reduction and 85% phenol photo-oxidation, and produces 117.77 μmol h −1 g −1 of ammonia under light irradiation. Electrochemical analysis suggests a four-electron/five proton-coupled N 2 photoreduction pathway. The designed oxygen vacancy oriented p−n heterojunction suffering double charge migration shows significant catalytic performance due to effective electron−hole separation as justified via PL, electrochemical impedance spectra (EIS), and Bode phase analysis.

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“…The higher photocatalytic activity observed on BiFeO 3 /CuWO 4 compared to single components was correlated with the heterojunction formation between the two oxides. The most beneficial BiFeO 3 :CuWO 4 ratio for the organic dyes photodegradation was found to be 1:1 [312]. Methyl violet (MV) was photooxidized up to 93% on a heterostructure based on p-n heterojunction BiFeO 3 /TiO 2 under visible irradiation as an effect of the poor recombination of charge carriers and strong absorption properties of the device [313].…”

Section: Applications Of Perovskite-type Materials In the Removal Of mentioning

confidence: 99%

Complex Catalytic Materials Based on the Perovskite-Type Structure for Energy and Environmental Applications

2020

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This review paper focuses on perovskite-type materials as (photo)catalysts for energy and environmental applications. After a short introduction and the description of the structure of inorganic and hybrid organic-inorganic perovskites, the methods of preparation of inorganic perovskites both as powders via chemical routes and as thin films via laser-based techniques are tackled with, for the first, an analysis of the influence of the preparation method on the specific surface area of the material obtained. Then, the (photo)catalytic applications of the perovskites in energy production either in the form of hydrogen via water photodecomposition or by methane combustion, and in the removal of organic pollutants from waste waters, are reviewed.

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Design and development of a novel BiFeO 3 /CuWO 4 heterojunction with enhanced photocatalytic performance for the degradation of organic dyes

Cited by 54 publications

References 36 publications

Structural evolution, growth mechanism and photoluminescence properties of CuWO4 nanocrystals

Structural evolution, growth mechanism and photoluminescence properties of CuWO4 nanocrystals

Efficient Photon Conversion via Double Charge Dynamics CeO₂–BiFeO₃ p–n Heterojunction Photocatalyst Promising toward N₂ Fixation and Phenol–Cr(VI) Detoxification

Complex Catalytic Materials Based on the Perovskite-Type Structure for Energy and Environmental Applications

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Design and development of a novel BiFeO 3 /CuWO 4 heterojunction with enhanced photocatalytic performance for the degradation of organic dyes

Cited by 54 publications

References 36 publications

Structural evolution, growth mechanism and photoluminescence properties of CuWO4 nanocrystals

Structural evolution, growth mechanism and photoluminescence properties of CuWO4 nanocrystals

Efficient Photon Conversion via Double Charge Dynamics CeO2–BiFeO3 p–n Heterojunction Photocatalyst Promising toward N2 Fixation and Phenol–Cr(VI) Detoxification

Complex Catalytic Materials Based on the Perovskite-Type Structure for Energy and Environmental Applications

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Efficient Photon Conversion via Double Charge Dynamics CeO₂–BiFeO₃ p–n Heterojunction Photocatalyst Promising toward N₂ Fixation and Phenol–Cr(VI) Detoxification