Photocatalytic behavior of BiOX (X = Cl/Br, Cl/I and Br/I) composites/heterogeneous nanostructures with organic dye

Tripathi, Gagan Kant; Kurchania, Rajnish

doi:10.1007/s11082-017-1042-3

Cited by 11 publications

(6 citation statements)

References 33 publications

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“…BiOBr material exhibits a wide bandgap of 2.64–2.91 eV . Although BiOBr exhibits marked UV and visible‐light photodegradation activities, its utilization of visible light is limited and undergoes rapid recombination of electrons and holes. Therefore, BiOBr shows low photocatalytic performance with visible light, thus limiting its use for practical applications in environmental remediation.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and photocatalytic properties of sunlight‐responsive BiOBr–CoWO₄ heterostructured nanocomposites

Chowdhury

Shambharkar

2020

Applied Organom Chemis

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Efficient sunlight‐responsive BiOBr–CoWO4 heterostructured nanocomposite photocatalysts were prepared via a chemical precipitation route at 100°C in 4 hours. The prepared BiOBr–CoWO4 heterostructures were characterized for phase identification, chemical composition, surface morphology, optical properties and surface area using various techniques. The X‐ray diffraction pattern of the BiOBr–CoWO4 nanocomposite was composed of diffraction peaks equivalent to both the tetragonal phase of BiOBr and the monoclinic phase of CoWO4 nanoparticles. X‐ray photoelectron spectral study of the BiOBr–CoWO4 nanocomposite revealed orbitals of both BiOBr and CoWO4 compounds. Transmission electron microscopy images revealed that spherical particles of CoWO4 (20–25 nm) were dispersed on the surface of BiOBr. UV–visible–near‐infrared spectral study of the BiOBr–CoWO4 nanocomposite showed good visible‐light absorption. Among the manufactured materials, BiOBr–CoWO4‐2 nanocomposite showed better charge carrier separation efficiency, as demonstrated by photoluminescence and time‐resolved fluorescence. To study the practical utility of the prepared materials, their photocatalytic capability was examined for the degradation of rhodamine B (RhB) aqueous solution under sunlight irradiation. The photodegradation results showed that BiOBr–CoWO4‐2 nanocomposite degraded 98.69% RhB solution and the degradation constant was 0.067 min−1, which was 5.6 and 22.5 times larger than that of pure BiOBr and CoWO4 nanoparticles, respectively, after 60 minutes of sunlight irradiation. The superior photoactivity was facilitated by electron–hole pair separation and transfer driven by the heterostructure interface between BiOBr particles and CoWO4 nanoparticles. The removal of RhB was initiated by photogenerated h+, O2•−and •OH reactive species based on the scavenger effect.

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Section: Introductionmentioning

confidence: 99%

Synthesis and photocatalytic properties of sunlight‐responsive BiOBr–CoWO₄ heterostructured nanocomposites

Chowdhury

Shambharkar

2020

Applied Organom Chemis

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“…Defect engineering and heteroatom doping are the common strategies to introduce reaction centers in various BiOX nanostructures (e.g., nanobelts, nanosheets, and nanospheres), enabling the activation of molecules like CO 2 , N 2 , H 2 O, and H 2 O 2 . ,, Oxygen vacancies or heteroatoms in BiOX induce impurity states in the middle of the band gap, which effectively broaden the optical absorbance in the visible regime. ,− Meanwhile, the influence of defects and dopants on the photocarrier dynamics is intricate, depending on the concentrations, local atomic structures, and energy levels of the impurity states . Some previous studies argued that the oxygen vacancies and elemental doping (such as Fe, Co, C, B) in BiOX can facilitate charge separation and improve the photocatalytic activity, − while many others using the time-resolved diffuse reflectance spectroscopy and photoluminescence claimed that the midgap states in semiconductors may trap charge carriers and provoke electron–hole recombination. − Evidently, the role of defects and dopants in BiOX, whether as a recombination center or as an efficient mediator for charge transfer, is still controversial. ,− Therefore, it is imperative to establish a time-dependent picture of the carrier transport behavior of the chemically modified BiOX for precisely modulating their photocatalytic performance.…”

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confidence: 99%

Control of Photocarrier Separation and Recombination at Bismuth Oxyhalide Interface for Nitrogen Fixation

Zhao

Zhou

et al. 2020

J. Phys. Chem. Lett.

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Developing high-efficiency photocatalysts for clean energy generation is a grand challenge, which requires simultaneously steering photocarrier dynamics and chemical activity for a specific reaction. To this end, here for the first time, we explore the real-time photocarrier transport property and catalytic mechanism of nitrogen reduction reaction (NRR) at the interface of bismuth oxyhalides (BiOX, X = Cl, Br, and I), an inexpensive and green semiconductor. By time-dependent ab initio non-adiabatic molecular dynamics simulations, we show that the separation and recombination processes of excited carriers as well as the catalytic activity can be concurrently optimized by precise band structure engineering. The exact influence of impurity states and heterojunction on the reduction power and lifetime of photogenerated carriers, light absorbance, and NRR activity/selectivity of BiOX are clearly unveiled, to provide essential physical insights for improving the photocatalytic efficiency of semiconductors for practical solar energy conversion and hydrogen fuel storage.

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“…The reported activity of BiOCl 0.5 Br 0.5 for the degradation of methyl orange was with more amount (200 mg) of catalyst in degrading lesser concentration (5 mg/L) of methyl orange under the similar reaction conditions 27 . This enhancement of the activity can be attributed to the narrow band gap and easy separation of the charge carriers in case of the heterojunction 27–29 . Furthermore, formation of an effective composite at the Fe 2 O 3 and BiOCl 0.5 Br 0.5 interface can also lead to an increase in the effective separation of photogenerated electrons and holes, thereby improving photocatalytic activity 30 .…”

Section: Resultsmentioning

confidence: 97%

Visible light‐driven photocatalytic degradation of methyl orange by Fe₂O₃‐BiOCl_0.5Br_0.5 composite photocatalyst

Barman

Singh

Bag

et al. 2021

Asia-Pacific J Chem Eng

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In this paper, a novel composite photocatalyst, ferric oxide–bismuth oxyhalide (Fe2O3‐BiOCl0.5Br0.5) has been synthesized, characterized, and used for the degradation of methyl orange through advanced oxidation process under ambient conditions (sunlight, pH 7.0, and temperature 25°C). The catalyst has been characterized by using UV‐Vis spectrophotometer, Fourier transform infrared (FTIR) spectroscopy, Raman spectrometer, scanning electron microscopy (SEM), energy dispersive X‐ray analysis (EDX), and X‐ray diffractometer (XRD) techniques. The catalyst shows appreciable activities under natural sunlight conditions. From the XRD patterns and SEM images, it is observed that the elongation along the z axis in the crystal lattice of BiOCl0.5Br0.5 in the catalyst can lead to a lattice distortion induced internal electric field which can help in charge carrier separation and transport. The Fe2O3‐BiOCl0.5Br0.5 catalyst shows more than 90% photodegradation efficiency of methyl orange in 90 min of sunlight exposure. The presence of magnetic ferric oxide in the composite photocatalyst helps to isolate the catalyst from the reaction mixture by using an external magnet, and thus, the Fe2O3‐BiOCl0.5Br0.5 catalyst can be reused repeatedly, towards degradation of organic pollutants.

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Photocatalytic behavior of BiOX (X = Cl/Br, Cl/I and Br/I) composites/heterogeneous nanostructures with organic dye

Cited by 11 publications

References 33 publications

Synthesis and photocatalytic properties of sunlight‐responsive BiOBr–CoWO₄ heterostructured nanocomposites

Synthesis and photocatalytic properties of sunlight‐responsive BiOBr–CoWO₄ heterostructured nanocomposites

Control of Photocarrier Separation and Recombination at Bismuth Oxyhalide Interface for Nitrogen Fixation

Visible light‐driven photocatalytic degradation of methyl orange by Fe₂O₃‐BiOCl_0.5Br_0.5 composite photocatalyst

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Photocatalytic behavior of BiOX (X = Cl/Br, Cl/I and Br/I) composites/heterogeneous nanostructures with organic dye

Cited by 11 publications

References 33 publications

Synthesis and photocatalytic properties of sunlight‐responsive BiOBr–CoWO4 heterostructured nanocomposites

Synthesis and photocatalytic properties of sunlight‐responsive BiOBr–CoWO4 heterostructured nanocomposites

Control of Photocarrier Separation and Recombination at Bismuth Oxyhalide Interface for Nitrogen Fixation

Visible light‐driven photocatalytic degradation of methyl orange by Fe2O3‐BiOCl0.5Br0.5 composite photocatalyst

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Synthesis and photocatalytic properties of sunlight‐responsive BiOBr–CoWO₄ heterostructured nanocomposites

Synthesis and photocatalytic properties of sunlight‐responsive BiOBr–CoWO₄ heterostructured nanocomposites

Visible light‐driven photocatalytic degradation of methyl orange by Fe₂O₃‐BiOCl_0.5Br_0.5 composite photocatalyst