Enhanced Photocatalytic Properties in BiOBr Nanosheets with Dominantly Exposed (102) Facets

Zhang, Haijun; Yang, Yuxiao; Zhou, Zhen; Zhao, Yaping; Liu, Lu

doi:10.1021/jp5035079

Cited by 157 publications

(75 citation statements)

References 40 publications

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“…As is well known, the layered tetragonal matlockite Therefore, the charge separation and transfer assisted by the internal electric fields are more favorable in BiOBr(H 2 O) and BiOBr(EtOH), where a shorter diffusion distance of photoinduced charge carriers than that in the BiOBr(IPA) [22]. In addtion, the different crystalline facets orientation is distinctive in the ability of electron injection, redox potential of hole, and the red-shift adsorption [21]. Therefore, BiOBr-60(Y) exhibits the different degradation capabilities and BiOBr-60(H 2 O) exhibit excellent activity.…”

Section: Tem Analysismentioning

confidence: 84%

“…The light absorption wavelength of BiOBr-60(IPA) is a litter longer than that of BiOBr-60(H 2 O) and BiOBr-60(EtOH), implying that BiOBr-60(IPA) exhibits a better light absorption activity, which may be associated with the different surface configurations of BiOBr nanosheets [21]. On the other hand, the BiOBr-60(H 2 O) revealed stronger absorption than BiOBr-60(EtOH) and BiOBr-60(IPA) in the range of 320-400 nm, this is also beneficial for the enhanced photocatalytic activity.…”

Section: Uv-vis Drs Analysismentioning

confidence: 98%

“…This requires a comprehensive understanding of the intrinsic character of the morphology [17,18], particle size [19], then insights on the relationship between the crystalline facet [20,21] and its performance. As most photocatalysts were prepared in solutions, the types of media solutions play a crucial role in the physicochemical properties and photocatalyst activity.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

A facile approach for the tunable fabrication of BiOBr photocatalysts with high activity and stability

Gao

Fan

et al. 2015

Applied Surface Science

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Section: Tem Analysismentioning

confidence: 84%

Section: Uv-vis Drs Analysismentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

A facile approach for the tunable fabrication of BiOBr photocatalysts with high activity and stability

Gao

Fan

et al. 2015

Applied Surface Science

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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.…”

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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“…4 Zhang prepared nanosheets dominated with {102} as well as with {001} facets and compared their catalytic performance for the degradation of rhodamine B (RhB) under visible light irradiation. 5 Chen reported ultrathin BiOBr nanosheets with the {001} facet percentage of 98% showing higher photocatalytic activity than BiOBr nanoplates (63% {001}). 6 In this work, the facetdependent photocatalytic activities of BiOBr with {001} and {110} dominant facets are systematically evaluated in the reduction of Cr(VI) ions under visible-light.…”

mentioning

confidence: 99%

Facet-dependent performance of BiOBr for photocatalytic reduction of Cr(vi)

et al. 2016

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BiOBr samples with different facets were prepared and used for photocatalytic reduction of hexavalent chromium under visible light.The results reveal that BiOBr dominated with {110} facets giving a specific rate constant 3 times as high as BiOBr with {001} facets, and its much stronger internal electric field was believed to be the main reason.Hexavalent chromium Cr(VI) is one of the forms of chromium that poses a health risk to humans because of its high acute toxicity and carcinogenic activity. Trivalent chromium Cr(III) is much less toxic and could be easily removed from wastewater as a solid by alkalinication and precipitation. Thus, developing effective technologies capable of reducing Cr(VI) to Cr(III) is of great importance for the treatment of wastewater. Visible light driven photocatalytic reduction as a promising method to achieve this purpose has attracted extensive attention worldwide. 1 Bismuth oxybromide BiOBr has proven itself as a kind of novel visible-light photocatalyst because the separation of photoinduced electrons and holes could be promoted by its internal static electric elds between the positive [Bi 2 O 2 ] slabs and the anionic bromine layers. 2 Li synthesized 3D owerlike BiOBr nanostructures with an excellent removal capacity and fast adsorption rate for Cr(VI). 3 Lin obtained BiOBr nanocrystals with {001} and {010} dominant facets by hydrothermal method for degrading 2,4-dichlorophenol under UV light. 4 Zhang prepared nanosheets dominated with {102} as well as with {001} facets and compared their catalytic performance for the degradation of rhodamine B (RhB) under visible light irradiation. 5 Chen reported ultrathin BiOBr nanosheets with the {001} facet percentage of 98% showing higher photocatalytic activity than BiOBr nanoplates (63% {001}). 6 In this work, the facetdependent photocatalytic activities of BiOBr with {001} and {110} dominant facets are systematically evaluated in the reduction of Cr(VI) ions under visible-light.All of the chemical reagents were of analytical grade and used without further purication. BiOBr with {001} facets, named as BOB-001, was obtained by a hydrolysis process at 90 C for 3 h using deionized water and ethanol (the volume ratio of 3 : 4) as the reaction media. 7 BiOBr dominated by the {110} facets was synthesized by treating the Bi(NO 3 ) 3 -KBr-PVPethylene glycol system at 120 C for 12 h, named as BOB-110. 8 The photocatalytic performance of as-prepared samples was evaluated by the reduction of Cr(VI) under visible-light irradiation at room temperature. Typically, 40 mg of BiOBr was suspended in 40 mL of 20 mg L À1 Cr(VI) solution, and the pH value was regulated to 3.0 by a dilute H 2 SO 4 solution; aer being kept in the dark for 30 min to reach the adsorption-desorption balance, the suspension with 0.5 vol% formic acid was irradiated with white 18 W-LEDs; a portion of reaction solutions, withdrawn every 10 min, was centrifuged and analyzed by 1,5-diphenylcarbazide method on a spectrophotometer (Tianjin UV-752B).The SEM images in Fig. 1 clearly...

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Enhanced Photocatalytic Properties in BiOBr Nanosheets with Dominantly Exposed (102) Facets

Cited by 157 publications

References 40 publications

A facile approach for the tunable fabrication of BiOBr photocatalysts with high activity and stability

A facile approach for the tunable fabrication of BiOBr photocatalysts with high activity and stability

Modulation of Photocatalytic Properties by Strain in 2D BiOBr Nanosheets

Facet-dependent performance of BiOBr for photocatalytic reduction of Cr(vi)

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