Details
| Originalsprache | Englisch |
|---|---|
| Seiten (von - bis) | 118-126 |
| Seitenumfang | 9 |
| Fachzeitschrift | Journal of Photochemistry and Photobiology A: Chemistry |
| Jahrgang | 366 |
| Frühes Online-Datum | 14 März 2018 |
| Publikationsstatus | Veröffentlicht - 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.
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in: Journal of Photochemistry and Photobiology A: Chemistry, Jahrgang 366, 01.11.2018, S. 118-126.
Publikation: Beitrag in Fachzeitschrift › Artikel › Forschung › Peer-Review
}
TY - JOUR
T1 - Visible-light photocatalytic activity of zinc ferrites
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
Y1 - 2018/11/1
N2 - 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.
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.
KW - Dye photobleaching
KW - Methylene blue
KW - Photocatalysis
KW - Spinel ferrite
KW - Wavelength dependent measurements
KW - Zinc ferrite
UR - http://www.scopus.com/inward/record.url?scp=85044509362&partnerID=8YFLogxK
U2 - 10.1016/j.jphotochem.2018.03.014
DO - 10.1016/j.jphotochem.2018.03.014
M3 - Article
VL - 366
SP - 118
EP - 126
JO - Journal of Photochemistry and Photobiology A: Chemistry
JF - Journal of Photochemistry and Photobiology A: Chemistry
SN - 1010-6030
ER -