Morphological, optical and X-ray photoelectron chemical state shift investigations of ZnO thin films

Jilani, Asim; Iqbal, Javed; Rafique, Shazia; Abdel-wahab, M. Sh.; Jamil, Yasir; Alghamdi, Abdullah

doi:10.1016/j.ijleo.2016.04.127

Cited by 28 publications

(12 citation statements)

References 36 publications

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“…Cf variation in the atomic percentage of O1s, Zn2p and Fe2p3 was noticed in GO-ZnFe 2 O 4 as compared to ZnFe 2 O 4 which is attributed to the change in the crystalline structure [25][26][27] and is also in good agreement to our XRD analysis ( figure 1).…”

Section: Photocatalytic Degradation and Analysis Methodssupporting

confidence: 89%

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Degradation of reactive dye using heterogeneous photo-Fenton catalysts: ZnFe₂O₄ and GO-ZnFe₂O₄ composite

Nadeem

Zahid

Tabasum

et al. 2020

Mater. Res. Express

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Dyes, being potential pollutants, need alarming attention for their degradation from wastewater. Advanced oxidation processes (AOPs) are among the most effective methodology for the degradation of pollutants. In the present study, the heterogeneous photo-Fenton catalysts (ZnFe 2 O 4 and graphene oxide based ZnFe 2 O 4 composite) were prepared and used to study the degradation of synzol red reactive dye. The prepared catalysts were well characterized by using SEM, FTIR and XRD analysis. The effect of various parameters like pH, catalysts dosage, H 2 O 2 dosage, effect of dye concentration and irradiation time during heterogeneous photo-Fenton processes was studied. The results showed 57% and 94% degradation of dye under optimized conditions (e.g. pH=3, Catalysts dose=75 mg l −1 for ZnFe 2 O 4 and 50 mg l −1 for GO-ZnFe 2 O 4 , H 2 O 2 dose=27 mM and irradiation time of 60 min) was observed for ZnFe 2 O 4 and GO-ZnFe 2 O 4 , respectively. A comparison of degradation potential of catalysts using various light sources like UV-254 nm, ambient solar light and white LED, was studied. The current findings support the application of solar and LED light for the degradation of organic pollutants in wastewater. The stability and reusability of these catalysts for the degradation of the dye were also studied. The GO-ZnFe 2 O 4 composite showed negligible iron leaching and no considerable reduction in degradation efficiency upto six consecutive cycles of reusability. It has been found that the composite (GO-ZnFe 2 O 4 ) showed enhanced degradation of dye as compared to ZnFe 2 O 4 .

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Section: Photocatalytic Degradation and Analysis Methodssupporting

confidence: 89%

“…The photocatalysts were examined by XRD analysis using X'Pert x-ray powder diffractometer (PW1398, Philips, Netherlands) equipped with Cu Kα radiation source (λ=0.154 nm). The crystallite size was calculated using Debye-Scherrer equation [25].…”

Section: Characterizationmentioning

confidence: 99%

Degradation of reactive dye using heterogeneous photo-Fenton catalysts: ZnFe₂O₄ and GO-ZnFe₂O₄ composite

Nadeem

Zahid

Tabasum

et al. 2020

Mater. Res. Express

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“…ZnO [74]. In this case, beyond the doping process promotes the creation of inter-band between CB and VB promoted by oxygen vacancies during the N doping process, which increase the light harvesting, mainly in the visible region [72,75], N doping process modify the VB and CB edge. .…”

Section: Materials Characterizationmentioning

confidence: 99%

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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“…The increase in the splitting of the two signals of Cd in the ternary alloy with 10% and 15% of S relative to the binary CdSe may have arisen from covering some of the Cd ions with sulfur. The variation in the peak positions (energy levels of 3d 5/2 and 3d 3/2 ) reflected the change in the crystalline structure by changing the composition of the nanostructure [54]. In addition to the change of the splitting of the 3d 5/2 and 3d 3/2 levels of cadmium, there was a variation in the atomic percentage of these two levels by the increasing S contents.…”

Section: Resultsmentioning

confidence: 99%

Facile Synthesis of Ternary Alloy of CdSe1-xSx Quantum Dots with Tunable Absorption and Emission of Visible Light

et al. 2018

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The synthesis of alloyed semiconductor quantum dots has produced structures that have distinct properties in comparison with both their bulk counterparts and their parent binary semiconductor quantum dots. In this work, the quantum confined structures of a ternary alloy of CdSe1−xSx were synthesized by one-pot synthesis method in an aqueous medium at a low temperature and capped with 3-mercaptopropoionic acid. Structures of the synthesized quantum dots were investigated by energy dispersive X-ray, X-ray diffraction, X-ray photoelectron spectroscopy, and high-resolution transmission electron microscopy. The obtained quantum dots had modified cubic structures as proven by X-ray diffraction and selected area electron diffraction. The optical properties of the synthesized quantum dots were characterized by optical absorption, photoluminescence, and color analysis. Optical absorption investigation revealed a widening of the band gap of CdSe1−xSx with increasing S content. This widening increased for the samples suspended in water relative to the samples measured in powder form due to the difference in the environment of the two cases. The size determined from the optical absorption measurements was found to be compatible with the sizes obtained from the X-ray diffraction with the value of bowing parameter around 1, which indicated a graded diffusion of sulfur. It was also ascertained that the emission of different compositions covered the most visible range with a small full width at half maximum. The x and y values of the chromaticity coordinates decreased with increasing sulfur content of up to 15%, while the z value increased.

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Morphological, optical and X-ray photoelectron chemical state shift investigations of ZnO thin films

Cited by 28 publications

References 36 publications

Degradation of reactive dye using heterogeneous photo-Fenton catalysts: ZnFe₂O₄ and GO-ZnFe₂O₄ composite

Degradation of reactive dye using heterogeneous photo-Fenton catalysts: ZnFe₂O₄ and GO-ZnFe₂O₄ composite

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

Facile Synthesis of Ternary Alloy of CdSe1-xSx Quantum Dots with Tunable Absorption and Emission of Visible Light

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Morphological, optical and X-ray photoelectron chemical state shift investigations of ZnO thin films

Cited by 28 publications

References 36 publications

Degradation of reactive dye using heterogeneous photo-Fenton catalysts: ZnFe2O4 and GO-ZnFe2O4 composite

Degradation of reactive dye using heterogeneous photo-Fenton catalysts: ZnFe2O4 and GO-ZnFe2O4 composite

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

Facile Synthesis of Ternary Alloy of CdSe1-xSx Quantum Dots with Tunable Absorption and Emission of Visible Light

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Product

Resources

About

Degradation of reactive dye using heterogeneous photo-Fenton catalysts: ZnFe₂O₄ and GO-ZnFe₂O₄ composite

Degradation of reactive dye using heterogeneous photo-Fenton catalysts: ZnFe₂O₄ and GO-ZnFe₂O₄ composite