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01-11-2023

Insights into the structural, morphological, and electronic characteristics of ZnO nanoflowers: implications for efficient photocatalytic degradation of crystal violet dye

Authors: Nupur Aggarwal, Ramgopal Ramisetty, Naveen Kumar, Daoud Ali, Anjana Sharma, Gokhlesh Kumar, Payal Patial, Kanchan Bala, Anu Kapoor, Nitish Kumar Sharma, Harpreet Kaur

Published in: Optical and Quantum Electronics | Issue 11/2023

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Abstract

The present study depicts, synthesis and physicochemical investigations of zinc oxide nanoflowers (ZnO NFs). X-ray diffraction (XRD) profile of ZnO NFs revealed that ZnO NFs exhibit hexagonal wurtzite-type structure of crystallinity with P6₃mc space group. Microstructural analysis displays a uniform flower-like shape of ZnO NFs with petals ranging from 1 to 2 μm and an overall size of 12 µm. The absorption spectrum of ZnO NFs showed characteristic peak at 365.7 nm with an optical energy band gap of 3.40 eV. The photocatalytic activity of the ZnO NFs was evaluated by exposing crystal violet (CV) dye to UV light in the presence of the ZnO NFs. The UV–Vis spectra showed a significant decrease in the intensity of the absorbance peak at ~ 590 nm, corresponding to the degradation of the dye. The degradation followed a first-order rate equation with a rate constant of 0.0404 min⁻¹ and excellent fit to the experimental data (R² = 0.987). Furthermore, the ZnO NFs displayed excellent reusability, with more than 90% removal efficiency after 5 cycles. These findings demonstrate the potential of ZnO NFs as an effective photocatalyst for removing toxicity from aqueous solutions. Hall effect measurements revealed the n-type character of ZnO NFs and their resistivity, carrier concentration and Hall mobility were found to be 29 Ω cm, 7.53 × 10⁶ cm⁻³, and 2.48 cm²/V s, respectively.

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Title: Insights into the structural, morphological, and electronic characteristics of ZnO nanoflowers: implications for efficient photocatalytic degradation of crystal violet dye
Authors: Nupur Aggarwal
Ramgopal Ramisetty
Naveen Kumar
Daoud Ali
Anjana Sharma
Gokhlesh Kumar
Payal Patial
Kanchan Bala
Anu Kapoor
Nitish Kumar Sharma
Harpreet Kaur
Publication date: 01-11-2023
Publisher: Springer US
Published in: Optical and Quantum Electronics / Issue 11/2023
Print ISSN: 0306-8919
Electronic ISSN: 1572-817X
DOI: https://doi.org/10.1007/s11082-023-05324-4

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