Controlled Hydrothermal Synthesis of Bismuth Oxyhalide Nanobelts and Nanotubes

Deng, Hong; Wang, Junwei; Peng, Qing; Wang, Xun; Li, Yadong

doi:10.1002/chem.200500540

Cited by 205 publications

(95 citation statements)

References 44 publications

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“…[4][5][6][7][8][9] In BiOX, [Bi2O2] 2+ slabs are interleaved with double halogen atoms slabs by strong electrovalent bonds along the [001] direction, while two closely adjacent slabs of halogen atoms are connected by van de Waals interactions. 10,11 The dispersive VB and CB induced by sp hybridization give rise to high mobility of the photoinduced charge carriers. In addition, the internal electric field resulting from the asymmetric charge distribution between [Bi2O2] 2+ and the halogen layers facilitates the effective separation of these photo-induced charge carriers, and hence, enables the photocatalytic activity of BiOX.…”

Section: Abstract: Biobr {001} Facets Strain Photocatalysis Densimentioning

confidence: 99%

Modulation of Photocatalytic Properties by Strain in 2D BiOBr Nanosheets

Feng¹,

Xu²,

Wang³

et al. 2015

ACS Appl. Mater. Interfaces

135

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BiOBr nanosheets with highly reactive {001} facets exposed were selectively synthesized by a facile hydrothermal method. The inner strain in the BiOBr nanosheets has been tuned continuously by the pH value. The photocatalytic performance of BiOBr in dye degradation can be manipulated by the strain effect. The low-strain BiOBr nanosheets show improved photocatalytic activity. Density functional calculations suggest that strain can modify the band structure and symmetry in BiOBr. The enhanced photocatalytic activity in low-strain BiOBr nanosheets is due to improved charge separation attributable to a highly dispersive band structure with an indirect band gap. AbstractBiOBr nanosheets with highly reactive {001} facets exposed were selectively synthesized by a

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Section: Abstract: Biobr {001} Facets Strain Photocatalysis Densimentioning

confidence: 99%

Modulation of Photocatalytic Properties by Strain in 2D BiOBr Nanosheets

Feng¹,

Xu²,

Wang³

et al. 2015

ACS Appl. Mater. Interfaces

135

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“…[18,19] However, controlling the self-assembly of the BiOBr building units, such as nanosheets, into their hollow architectures is still a bottleneck. Moreover, the photocatalytic activity of BiOBr is far from efficient for practical applications and it is indispensable to boost the photocatalytic efficiency by microstructure modulations.…”

mentioning

confidence: 99%

One‐Pot Miniemulsion‐Mediated Route to BiOBr Hollow Microspheres with Highly Efficient Photocatalytic Activity

Cheng

Huang

Wang

et al. 2011

Chemistry A European J

168

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Due to the shape-dependent physical/chemical properties of inorganic materials, methodological syntheses of their ordered architectures have always been the hotspots in materials chemistry. In particular, attention has been paid to the self-assembly of the hierarchical macro-, meso-, or microstructures with hollow voids, which possess the combined features of nanosized building blocks and the organized architectures, in virtue of their potential applications in drug delivery, lithium-ion batteries, and catalysis.[1] Numerous synthetic methods have been exploited to accelerate the realization of special microstructures. For example, the conventional template-directed synthesis turns out to be a universal and effective approach, in which hard or soft templates, such as polymer supports, [2] carbon spheres, [3] and organic surfactants [4] are employed to tailor the growth process. Nevertheless, the template-directed routes usually subject to the tedious procedures and possible impurities introduced. Ideally, people would prefer template-free routes to the inorganic materials with hollow interiors. As an alternative route to templates, emulsion and miniemulsion systems, which are thermodynamically instable, have been employed to produce hollow structures. [5][6][7][8] Derived from the limited miscibility of the mixed solvents, microsized to even larger emulsions, which can perform as the microreactors, are produced by the micro-heterogeneities by means of sonicating or stirring. [9,10] However, most of the syntheses require large quantities of surfactants to generate micelles, thereby increasing the complexity, and one-pot rational control of the hollow architectures still remains a challenge.Recently, semiconductor photocatalysis has been regarded as an effective resolution to the hydrogen production and organic pollutants removal. [11][12][13][14][15][16][17] The conventional semiconductors, TiO 2 and WO 3 , however, are restricted by their deficient visible-light absorption or high recombination rate of the photogenerated carriers. [11,14] In search of highly visiblelight-active photocatalysts, great efforts have been dedicated to the bandgap regulation and quantum efficiency improvement. As a ternary semiconductor, BiOBr crystallizes in a layered structure composed of [Bi 2 O 2 ] 2 + layers interleaved with double Br layers. Previously, BiOBr has exhibited considerable visible-light photocatalytic performance in the degradation of organic contaminants.[18] So far, a variety of BiOBr nano/micro-structures, including nanoplates, nanobelts, and microspheres, have been fabricated by numerous methods. [18,19] However, controlling the self-assembly of the BiOBr building units, such as nanosheets, into their hollow architectures is still a bottleneck. Moreover, the photocatalytic activity of BiOBr is far from efficient for practical applications and it is indispensable to boost the photocatalytic efficiency by microstructure modulations.Herein, we report a facile one-pot approach to the uniform BiOBr hollow microspher...

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“…Relative quantitative analysis shows that the atomic ratio of Bi to Cl is quite close to 6, in accordance with the stoichiometric Bi 12 O 17 Cl 2 . However, the atomic proportion of O element is slightly higher than the theoretical value, maybe arising from the influence of the OH À and H 2 O adsorbed on surface of samples [25]. A possible process for the formation of sample Bi 12 O 17 Cl 2 is described as from Eqs.…”

Section: Morphology and Microstructuresmentioning

confidence: 94%

Poly(vinyl pyrrolidone)-assisted hydrothermal synthesis and enhanced visible-light photocatalytic performance of oxygen-rich bismuth oxychlorides

Chang

Luo

Wang

et al. 2015

Journal of Colloid and Interface Science

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a b s t r a c tA series of novel oxygen-rich bismuth oxychloride (Bi 12 O 17 Cl 2 ) were synthesized through a facile poly (vinyl pyrrolidone) (PVP)-assisted hydrothermal route. These obtained Bi 12 O 17 Cl 2 samples were characterized by various physicochemical techniques. It was found that a proper addition amount of PVP could promote the transformation of Bi 12 O 17 Cl 2 morphology from irregular clusters to three-dimensional hierarchical flower-like microspheres that were nominated as sample BP2. As-synthesized samples were subjected to a photocatalytic degradation of dye Rhodamine B (RhB) or 2,4-dichlorophenol (2,4-DCP) under visible light. Among all candidates, the sample BP2 with a hierarchical flower-like morphology showed the best degradation efficiency for RhB and 2,4-DCP. The apparent rate constant of sample BP2 in terms of degradation of RhB was nearly 5.7 and 45 times that of unmodified BP0 and N-TiO 2 . The enhanced photocatalytic performance could be ascribed to synergetic effects including unique hierarchical morphologies, large specific surface area, small particle size, good crystallinity, and suitable band structures. A possible mechanism of catalytic degradation was finally proposed basing upon the active species trapping experiments.

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Controlled Hydrothermal Synthesis of Bismuth Oxyhalide Nanobelts and Nanotubes

Cited by 205 publications

References 44 publications

Modulation of Photocatalytic Properties by Strain in 2D BiOBr Nanosheets

Modulation of Photocatalytic Properties by Strain in 2D BiOBr Nanosheets

One‐Pot Miniemulsion‐Mediated Route to BiOBr Hollow Microspheres with Highly Efficient Photocatalytic Activity

Poly(vinyl pyrrolidone)-assisted hydrothermal synthesis and enhanced visible-light photocatalytic performance of oxygen-rich bismuth oxychlorides

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