Photocatalysis with nanostructured zinc oxide thin films: The relationship between morphology and photocatalytic activity under oxygen limited and oxygen rich conditions and evidence for a Mars Van Krevelen mechanism

Ali, Arshid Mahmood; Emanuelsson, Emma Anna Carolina; Patterson, Darrell Alec

doi:10.1016/j.apcatb.2010.03.037

Cited by 126 publications

(105 citation statements)

References 28 publications

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“…Also, by comparing (002) and (101), the first one presents an increase in photocatalytic activity for RhB discoloration, during UV illumination. The influence of photocatalytic activity by crystal face exposition is observed by other authors [77][78][79]. [44,45] The specific surface area (SSA) of ZnOm is higher than ZnO:Nm sample, promoting the increase in photocatalytic activity under UV illumination.…”

Section: Consequently [As] Is Incorporated Into Kinetic Rate (K) Thmentioning

confidence: 67%

The interplay between morphology and photocatalytic activity in ZnO and N-doped ZnO crystals

et al. 2017

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Photocatalytic materials can perform oxidative and reductive reactions over their surfaces when excited with light. Intrinsic characteristics of the material such as superficial area, morphological structure, and crystalline phase exposition play a fundamental role in the corresponding reaction paths. However, especially in doped semiconductors, as ZnO:N, less is known about how the synthesis parameters affect the morphologies and the photocatalytic activity simultaneously. To solve this issue, ZnO and ZnO:N samples were obtained using microwave-assisted hydrothermal and modified polymeric precursor methods of synthesis. Samples morphologies were characterized by TEM and FE-SEM. Crystallographic phases were observed by XRD and optical characteristics by DRS. XPS results confirmed the doping process. Degradation of Rhodamine-B and Cr(VI) reduction were employed as probe reactions to investigate their photocatalytic activity. Although the crystallographic structure of these powders maintains the ZnO hexagonal wurtzite structure, the optical properties and morphologies, and photocatalytic activities present different behaviors. Also, density functional theory calculations were employed to determine the specific features related to electronic structure, morphology, and photocatalytic activity.Different synthesis methods produce a singular behavior in the physicochemical properties of materials, and the doping effect produces various modifications in RhB degradation and Cr(VI) reduction for each synthesis method. Crystal face exposition and morphologies are related to the improvement in the photocatalytic activity of the materials.

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Section: Consequently [As] Is Incorporated Into Kinetic Rate (K) Thmentioning

confidence: 67%

The interplay between morphology and photocatalytic activity in ZnO and N-doped ZnO crystals

et al. 2017

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“…Only a few studies (such as [13][14][15][16]) investigate supported ZnO thin films, which are able to overcome these disadvantages. This work builds on previous work from this research group (Ali et al [21] and McFarlane et al [22]) where it was shown that for ZnO thin films hydrothermally grown from solutions containing Zn(NO 3 ) 2 , hexamethylenetetramine (HMT) and/or polyethyleneimine (PEI), a rich supply of oxygen decreases the structural erosion during the photoreaction with methylene blue (MB). It was speculated that the photocatalysed oxidation by these solution deposited ZnO thin films occurs (at least partially) by a Mars-Van Krevelen (MVK) type mechanism, where oxygen from the catalyst lattice is removed and used in the oxidation reaction.…”

Section: Introductionmentioning

confidence: 83%

Conventional versus lattice photocatalysed reactions: Implications of the lattice oxygen participation in the liquid phase photocatalytic oxidation with nanostructured ZnO thin films on reaction products and mechanism at both 254nm and 340nm

Ali

Emanuelsson

Patterson

2011

Applied Catalysis B: Environmental

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“…[30,31] Nanoscale photocatalysts are believed to perform better than the bulk materials because they possess a higher surface-to-volume ratio and a higher efficiency for separating the photogenerated electrons and holes. [32,33] The morphologies of the BiOCl 1Àx Br x solid solutions are presented in Figure 4, which reveals that all samples consist of microplates with no obvious difference in the thickness and size.…”

Section: Wwwchemeurjorgmentioning

confidence: 99%

Composition Dependence of the Photocatalytic Activities of BiOCl_1−xBr_x Solid Solutions under Visible Light

Liu

Son

et al. 2011

Chemistry A European J

206

108

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We prepared BiOCl(1-x)Br(x) (x=0-1) solid solutions and characterized their structures, morphologies, and photocatalytic properties by X-ray diffraction, diffuse reflectance spectroscopy, scanning electron microscopy, Raman spectroscopy, photocurrent and photocatalytic activity measurements and also by density functional theory calculations for BiOCl, BiOBr, BiOCl(0.5)Br(0.5). Under visible-light irradiation BiOCl(1-x)Br(x) exhibits a stronger photocatalytic activity than do BiOCl and BiOBr, with the activity reaching the maximum at x=0.5 and decreasing gradually as x is increased toward 1 or decreased toward 0. This trend is closely mimicked by the photogenerated current of BiOCl(1-x)Br(x) , indicating that the enhanced photocatalytic activity of BiOCl(1-x)Br(x) with respect to those of BiOCl and BiOBr originates from the trapping of photogenerated carriers. Our electronic structure calculations for BiOCl(0.5)Br(0.5) with the anion (O(2-), Cl(-), Br(-)) and cation (Bi(3+)) vacancies suggest that the trapping of photogenerated carriers is caused most likely by Bi(3+) cation vacancies, which generate hole states above the conduction band maximum.

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Photocatalysis with nanostructured zinc oxide thin films: The relationship between morphology and photocatalytic activity under oxygen limited and oxygen rich conditions and evidence for a Mars Van Krevelen mechanism

Cited by 126 publications

References 28 publications

The interplay between morphology and photocatalytic activity in ZnO and N-doped ZnO crystals

The interplay between morphology and photocatalytic activity in ZnO and N-doped ZnO crystals

Conventional versus lattice photocatalysed reactions: Implications of the lattice oxygen participation in the liquid phase photocatalytic oxidation with nanostructured ZnO thin films on reaction products and mechanism at both 254nm and 340nm

Composition Dependence of the Photocatalytic Activities of BiOCl_1−xBr_x Solid Solutions under Visible Light

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Photocatalysis with nanostructured zinc oxide thin films: The relationship between morphology and photocatalytic activity under oxygen limited and oxygen rich conditions and evidence for a Mars Van Krevelen mechanism

Cited by 126 publications

References 28 publications

The interplay between morphology and photocatalytic activity in ZnO and N-doped ZnO crystals

The interplay between morphology and photocatalytic activity in ZnO and N-doped ZnO crystals

Conventional versus lattice photocatalysed reactions: Implications of the lattice oxygen participation in the liquid phase photocatalytic oxidation with nanostructured ZnO thin films on reaction products and mechanism at both 254nm and 340nm

Composition Dependence of the Photocatalytic Activities of BiOCl1−xBrx Solid Solutions under Visible Light

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Composition Dependence of the Photocatalytic Activities of BiOCl_1−xBr_x Solid Solutions under Visible Light