Structural, optical and photocatalytic properties of hafnium doped zinc oxide nanophotocatalyst

Ahmad, M., Ahmed, E., Hong, Z. L. , Iqbal, Z., Khalid, N. R., Abbas, T., Ahmad, I., Elhissi, A. M. and Ahmed, W. (2013) Structural, optical and photocatalytic properties of hafnium doped zinc oxide nanophotocatalyst. Ceramics International, 39 (8). pp. 8693-8700. ISSN 0272-8842

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A series of novel hafnium (Hf) doped ZnO nanophotocatalyst were synthesized using a simple sol-gel method with a doping content of up to 6 mol. The structure, morphology and optical characteristics of the photocatalysts were characterized by XRD, SEM, TEM, FTIR, XPS, DRS and PL spectroscopy. The successful synthesis and chemical composition of pure and doped ZnO photocatalysts were confirmed by XRD and XPS. DRS confirmed that the spectral responses of the photocatalysts were shifted towards the visible light region and showed a reduction in band gap energy from 3.26 to 3.17 eV. Fluorescence emission spectra indicated that doped ZnO samples possess better charge separation capability than pure ZnO. The photocatalytic activity of Hf-doped ZnO was evaluated by the methylene blue (MB) degradation in aqueous solution under sunlight irradiation. Parameters such as irradiation time and doping content were found effective on the photoactivity of pure ZnO and Hf-doped ZnO. The photocatalysis experiments demonstrated that 2 mol Hf-ZnO exhibited higher photocatalytic activity as compared to ZnO, ZnO commercial and other hafnium doped ZnO photocatalysts and also revealed that MB was effectively degraded by more than 85 within 120 min. The enhanced photoactivity might be attributed to effective charge separation and enhanced visible light absorption. It was concluded that the presence of hafnium within ZnO lattice could enhance the photocatalytic oxidation over pure ZnO. © 2013 Elsevier Ltd and Techna Group S.r.l.

Keywords:Fluorescence emission spectra, Hf-doped, Methylene Blue, Optical characteristics, Photocatalytic activities, Photocatalytic oxidations, Visible light absorption, ZnO, Aromatic compounds, Doping (additives), Emission spectroscopy, Fourier transform infrared spectroscopy, Hafnium, Irradiation, Photocatalysis, Photocatalysts, Sol-gel process, Sol-gels, X ray photoelectron spectroscopy, Zinc oxide
Subjects:F Physical Sciences > F200 Materials Science
J Technologies > J510 Materials Technology
Divisions:College of Science > School of Mathematics and Physics
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ID Code:27141
Deposited On:03 Jul 2017 11:22

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