Visible-light photocatalytic activity of zinc ferrites

Research output: Contribution to journalArticleResearchpeer review

Authors

  • A. Arimi
  • L. Megatif
  • L.I. Granone
  • R. Dillert
  • D.W. Bahnemann

External Research Organisations

  • Saint Petersburg State University
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Details

Original languageEnglish
Pages (from-to)118-126
Number of pages9
JournalJournal of Photochemistry and Photobiology A: Chemistry
Volume366
Early online date14 Mar 2018
Publication statusPublished - 1 Nov 2018

Abstract

Zinc ferrite samples were prepared at temperatures between 75 °C and 1100 °C employing published synthetic methods Phase pure zinc ferrites were, however, only obtained through high-temperature methods (more than 800 °C) as revealed by XRD and Raman analysis. Photocatalytic experiments under UV and visible light irradiation as well as a series of detailed wavelength dependent measurements applying monochromatic light sources emitting at wavelengths of 365, 455, 505, and 660 nm were performed. Visible light-induced bleaching of methylene blue in aqueous suspensions of zinc ferrites was observed. However, no photocatalytic formation of OH radicals was detected. The results of flat band potential measurements revealed the interfacial electron transfer from an excited methylene blue molecule into the conduction band of zinc ferrite to be thermodynamically possible. The bleaching of methylene blue containing suspensions under visible light irradiation is, therefore, assumed to be initiated by an interfacial electron transfer from photo-excited methylene blue molecules adsorbed on the ferrite surface into the conduction band of the semiconducting zinc ferrite.

Keywords

    Dye photobleaching, Methylene blue, Photocatalysis, Spinel ferrite, Wavelength dependent measurements, Zinc ferrite

ASJC Scopus subject areas

Cite this

Visible-light photocatalytic activity of zinc ferrites. / Arimi, A.; Megatif, L.; Granone, L.I. et al.
In: Journal of Photochemistry and Photobiology A: Chemistry, Vol. 366, 01.11.2018, p. 118-126.

Research output: Contribution to journalArticleResearchpeer review

Arimi A, Megatif L, Granone LI, Dillert R, Bahnemann DW. Visible-light photocatalytic activity of zinc ferrites. Journal of Photochemistry and Photobiology A: Chemistry. 2018 Nov 1;366:118-126. Epub 2018 Mar 14. doi: 10.1016/j.jphotochem.2018.03.014
Arimi, A. ; Megatif, L. ; Granone, L.I. et al. / Visible-light photocatalytic activity of zinc ferrites. In: Journal of Photochemistry and Photobiology A: Chemistry. 2018 ; Vol. 366. pp. 118-126.
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AU - Arimi, A.

AU - Megatif, L.

AU - Granone, L.I.

AU - Dillert, R.

AU - Bahnemann, D.W.

N1 - © 2018 Elsevier B.V. All rights reserved.

PY - 2018/11/1

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AB - Zinc ferrite samples were prepared at temperatures between 75 °C and 1100 °C employing published synthetic methods Phase pure zinc ferrites were, however, only obtained through high-temperature methods (more than 800 °C) as revealed by XRD and Raman analysis. Photocatalytic experiments under UV and visible light irradiation as well as a series of detailed wavelength dependent measurements applying monochromatic light sources emitting at wavelengths of 365, 455, 505, and 660 nm were performed. Visible light-induced bleaching of methylene blue in aqueous suspensions of zinc ferrites was observed. However, no photocatalytic formation of OH radicals was detected. The results of flat band potential measurements revealed the interfacial electron transfer from an excited methylene blue molecule into the conduction band of zinc ferrite to be thermodynamically possible. The bleaching of methylene blue containing suspensions under visible light irradiation is, therefore, assumed to be initiated by an interfacial electron transfer from photo-excited methylene blue molecules adsorbed on the ferrite surface into the conduction band of the semiconducting zinc ferrite.

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