Microwave-hydrothermal synthesis of BiOBr/Bi2WO6 nanocomposites for enhanced photocatalytic performance

Dumrongrojthanath, Phattranit; Phuruangrat, Anukorn; Doungarno, Khwanchanok; Thongtem, Titipun; Patiphatpanya, Panudda; Thongtem, Somchai

doi:10.1016/j.ceramint.2018.08.128

Cited by 29 publications

(6 citation statements)

References 21 publications

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“…The polarization electric field can promote the spatial separation of photogenerated electron/hole pairs, making BiOX exhibit a superior photocatalytic activity for the degradation of organic dyes. Moreover, much work has been devoted to the incorporation of BiOX with other semiconductors to form excellent heterojunction composite photocatalysts [20][21][22][23][24]. Due to the efficient separation of electron/hole pairs resulting from the charge transfer between the two semiconductors, those heterojunction composite photocatalysts generally exhibit photocatalytic performances superior to single semiconductor photocatalysts.…”

Section: Introductionmentioning

confidence: 99%

NaBH4-Reduction Induced Evolution of Bi Nanoparticles from BiOCl Nanoplates and Construction of Promising Bi@BiOCl Hybrid Photocatalysts

Yan

Yang

et al. 2019

Catalysts

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In this work, we have synthesized BiOCl nanoplates (diameter 140–220 nm, thickness 60–70 nm) via a co-precipitation method, and then created Bi nanoparticles (diameter 35–50 nm) on the surface of BiOCl nanoplates via a NaBH4 reduction method. By varying the NaBH4 concentration and reaction time, the evolution of Bi nanoparticles was systematically investigated. It is demonstrated that with increasing the NaBH4 concentration (at a fixing reaction time of 30 min), BiOCl crystals are gradually reduced into Bi nanoparticles, and pure Bi nanoparticles are formed at 120 mM NaBH4 solution treatment. At low-concentration NaBH4 solutions (e.g., 10 and 30 mM), with increasing the reaction time, BiOCl crystals are partially reduced into Bi nanoparticles, and then the Bi nanoparticles return to form BiOCl crystals. At high-concentration NaBH4 solutions (e.g., 120 mM), BiOCl crystals are reduced to Bi nanoparticles completely with a short reaction time, and further prolong the treatment time leads to the transformation of the Bi nanoparticles into a two-phase mixture of BiOCl and Bi2O3 nanowires. The photodegradation performances of the samples were investigated by choosing rhodamine B (RhB) as the model pollutant and using simulated sunlight as the light source. It is demonstrated that an enhanced photodegradation performance can be achieved for the created Bi@BiOCl hybrid composites with appropriate NaBH4 treatment. The underlying photocatalytic mechanism was systematically investigated and discussed.

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Section: Introductionmentioning

confidence: 99%

NaBH4-Reduction Induced Evolution of Bi Nanoparticles from BiOCl Nanoplates and Construction of Promising Bi@BiOCl Hybrid Photocatalysts

Yan

Yang

et al. 2019

Catalysts

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“…As another photocatalyst, BiOI has also been extensively studied both experimentally and theoretically due to its unique layered structure with a space group P4/nmms, narrow bandgap, and the presence of an internal electric field between the [Bi 2 O 2 ] 2+ and I − slab along the (001) direction [21][22][23], as well as other advantages. These characteristics lead to a relatively remarkable degradation efficiency of pollutants under visible light [24,25]. Consequently, BiOI was usually an excellent candidate for constructing heterojunction with other semiconductors to furtherly enhance the photocatalytic activity [26].…”

Section: Introductionmentioning

confidence: 99%

Surface termination modulation for superior S-Scheme Bi₂WO₆/BiOI heterojunction photocatalyst: a hybrid density functional study

Nie,

Liu,

Kong

et al. 2024

Nanotechnology

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The prevailing theoretical frameworks indicate that depending on the growth conditions, the Bi2WO6(001) surface can manifest in three distinct terminations—DL-O-Bi (DL: Double layers), O-Bi, and O-W. In this study, we conduct a comprehensive examination of the interplay between these terminations on Bi2WO6(001) and the 1I-terminated BiOI(001) facet, especially focusing on their impact on the photocatalytic activity of Bi2WO6/BiOI heterostructure, applying hybrid functional calculations. The models formulated for this research are designated as Bi2WO6(O-Bi)/BiOI(1I), Bi2WO6(DL-O-Bi)/BiOI(1I), and Bi2WO6(O-W)/BiOI(1I). Our findings reveal that Bi2WO6(O-Bi)/BiOI(1I) shows a type II band alignment, which facilitates the spatial separation of photo-generated electrons and holes. Notably, the Bi2WO6(DL-O-Bi)/BiOI(1I) configuration has the lowest binding energy and results in an S-scheme (or Step-scheme) heterostructure. In contrast to the type II heterostructure, this particular configuration demonstrates enhanced photocatalytic efficiency due to improved photo-generated carrier separation, augmented oxidation capability, and better visible-light absorption. Conversely, Bi2WO6(O-W)/BiOI(1I) presents a type I projected band structure, which is less conducive for the separation of photo-generated electron-hole pairs. In summation, this investigation points out that one could significantly refine the photocatalytic efficacy of not only Bi2WO6/BiOI but also other heterostructure photocatalysts by modulating the coupling of different terminations via precise crystal synthesis or growth conditions.

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“…The construction of heterojunctions and heterogeneous atom doping are viable routes to improve the performance of photocatalytic materials. , In addition, bismuth bromide oxide (BiOBr) has also attracted widespread attention due to its appropriate band gap (2.6–2.9 eV), excellent chemical stability, high visible light activity, and unique layered structure. − The exposed {001} facets of BiOBr are terminated with a high density of oxygen atoms, which favors the generation of oxygen defects. Such surface oxygen vacancies (OVs) can act as active sites for adsorption and charge traps to prevent the recombination of photogenerated electron–hole pairs. − Moreover, the conduction band (CB) and valence band (VB) of BiOBr are dominated by the orbitals of Bi 6p and Br 4p, respectively, making BiOBr more susceptible to excitation in visible light. − Therefore, BiOBr is a highly promising photocatalytic material.…”

Section: Introductionmentioning

confidence: 99%

Swallowed Embedding of Nanopetal-Rich Microflowers in Flexible Photocatalytic and Thermoresponsive Functional Composite Fibers

Tao,

Luo,

Shen

et al. 2024

Langmuir

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Developing efficient catalysts to degrade pollutants in water is a very important way to alleviate water pollution. However, it is crucial but challenging to broaden the functions of conventional photocatalysts and improve their environmental adaptability. In this paper, Bi(Er 3+ /Yb 3+ )OBr/polyacrylonitrile (BOB-EY/PAN) composite fibers with a swallowed-embedded structure assembled with nanopetal-rich microflowers were designed and fabricated, integrating photocatalytic and temperature-monitoring functions simultaneously. Their unique structure brings a large specific surface area, and the doping of rare earth ions improves the separation efficiency of electron−hole pairs, which enhances the photocatalytic efficiency and endows the fibers with a temperature-monitoring function at the same time. Under simulated sunlight irradiation, the nanofibers show a maximum degradation efficiency of 99.2% for tetracycline hydrochloride (TC) with a degradation constant of K as high as 0.078 min −1 . Based on the fluorescence intensity ratio (FIR), the two thermally coupled levels of Er 3+ in the nanofibers, 2 H 11/2 and 4 S 3/2 , provide real-time temperature feedback, displaying a maximum relative sensitivity as high as 0.0215 K −1 at 303 K. Dual-functional BOB-EY/PAN composite nanofibers show great potential for industrial wastewater disposition, providing solutions for wastewater purification in special scenarios.

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Microwave-hydrothermal synthesis of BiOBr/Bi2WO6 nanocomposites for enhanced photocatalytic performance

Cited by 29 publications

References 21 publications

NaBH4-Reduction Induced Evolution of Bi Nanoparticles from BiOCl Nanoplates and Construction of Promising Bi@BiOCl Hybrid Photocatalysts

NaBH4-Reduction Induced Evolution of Bi Nanoparticles from BiOCl Nanoplates and Construction of Promising Bi@BiOCl Hybrid Photocatalysts

Surface termination modulation for superior S-Scheme Bi₂WO₆/BiOI heterojunction photocatalyst: a hybrid density functional study

Swallowed Embedding of Nanopetal-Rich Microflowers in Flexible Photocatalytic and Thermoresponsive Functional Composite Fibers

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Microwave-hydrothermal synthesis of BiOBr/Bi2WO6 nanocomposites for enhanced photocatalytic performance

Cited by 29 publications

References 21 publications

NaBH4-Reduction Induced Evolution of Bi Nanoparticles from BiOCl Nanoplates and Construction of Promising Bi@BiOCl Hybrid Photocatalysts

NaBH4-Reduction Induced Evolution of Bi Nanoparticles from BiOCl Nanoplates and Construction of Promising Bi@BiOCl Hybrid Photocatalysts

Surface termination modulation for superior S-Scheme Bi2WO6/BiOI heterojunction photocatalyst: a hybrid density functional study

Swallowed Embedding of Nanopetal-Rich Microflowers in Flexible Photocatalytic and Thermoresponsive Functional Composite Fibers

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Surface termination modulation for superior S-Scheme Bi₂WO₆/BiOI heterojunction photocatalyst: a hybrid density functional study