Oriented attachment growth of BiOCl nanosheets with exposed {110} facets and photocatalytic activity of the hierarchical nanostructures

Cui, Zhankui; Mi, Liwei; Zeng, Dawen

doi:10.1016/j.jallcom.2012.09.075

Cited by 82 publications

(32 citation statements)

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“…Recently, considerable attentions have been paid to prepare BiOX with variety of morphologies and structures [9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24]. However, photocatalytic efficiencies of pure BiOX are unsatisfactory for the further applications under irradiation of visible light.…”

Section: Introductionmentioning

confidence: 99%

Preparation and first-principles study for electronic structures of BiOI/BiOCl composites with highly improved photocatalytic and adsorption performances

Yang

Zhang

et al. 2016

Journal of Molecular Catalysis A: Chemical

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Section: Introductionmentioning

confidence: 99%

Preparation and first-principles study for electronic structures of BiOI/BiOCl composites with highly improved photocatalytic and adsorption performances

Yang

Zhang

et al. 2016

Journal of Molecular Catalysis A: Chemical

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“…6b), and oen was used as a good reason for the promising catalytic activity of BiOX with {001} facets compared to BiOX with {010} facets, which has no such IEF. 4,10,11 As to the {110} planes of BiOX, it hardly to see such explanation based on the IEF effect. The side view of atomic arrangements for {110} surface of BiOBr (Fig.…”

mentioning

confidence: 97%

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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“…Hydroxyl radicals have been considered to be the major active species during photocatalytic process and can be measured by a simple fluorescence probe method using coumarin as probe molecules [18]. Typically, 0.05 g Bi NPs were dispersed in 20 ml 10 −3 mol/l coumarin solution and allowed to stand for 1 h to reach equilibrium before light irradiation.…”

Section: Hydroxyl Radical Detectionmentioning

confidence: 99%

Preparation and photocatalytic performance of Bi nanoparticles by microwave-assisted method using ascorbic acid as reducing agent

Cui

Zhang

et al. 2015

Catalysis Communications

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Oriented attachment growth of BiOCl nanosheets with exposed {110} facets and photocatalytic activity of the hierarchical nanostructures

Cited by 82 publications

References 34 publications

Preparation and first-principles study for electronic structures of BiOI/BiOCl composites with highly improved photocatalytic and adsorption performances

Preparation and first-principles study for electronic structures of BiOI/BiOCl composites with highly improved photocatalytic and adsorption performances

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

Preparation and photocatalytic performance of Bi nanoparticles by microwave-assisted method using ascorbic acid as reducing agent

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