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Publikationstyp: Beitrag in wissenschaftlicher Zeitschrift
Art der Begutachtung: Peer review (Publikation)
Titel: Strong activity enhancement of the photocatalytic degradation of an azo dye on Au/TiO2 doped with FeOx
Autor/-in: Waheed, Ammara
Shi, Quanquan
Maeda, Nobutaka
Meier, Daniel Matthias
Qin, Zhaoxian
Li, Gao
Baiker, Alfons
et. al: No
DOI: 10.3390/catal10080933
10.21256/zhaw-20356
Erschienen in: Catalysts
Band(Heft): 10
Heft: 8
Seite(n): 933
Erscheinungsdatum: 13-Aug-2020
Verlag / Hrsg. Institution: MDPI
ISSN: 2073-4344
Sprache: Englisch
Schlagwörter: Orange II; Operando; Photocatalysis; Au-FeOx/TiO2; Modulation; Excitation; Spectroscopy
Fachgebiet (DDC): 660: Technische Chemie
Zusammenfassung: The doping of Au/TiO2 with FeOx is shown to result in a strong enhancement of its photocatalytic activity in the degradation of the azo dye Orange II. In order to examine the source of this enhancement, Au-FeOx/TiO2 nanocomposites containing different molar ratios of Au:Fe were synthesized, and X-ray diffraction (XRD), X-ray photoemission spectroscopy (XPS), and high-resolution transmission electron microscope (HRTEM) analyses indicated that the TiO2-supported Au nanoparticles were partially covered with an amorphous layer of FeOx species, in which the iron was present as Fe2+ and Fe3+. The metal-semiconductor system, i.e., Au/TiO2, showed only a moderate degradation rate, whereas doping with FeOx strongly enhanced the degradation activity. The bandgap energy decreased gradually from Au/TiO2 (3.13 eV) to the catalyst with the highest FeOx loading Au-FeOx (1:2)/TiO2 (2.23 eV), and this decrease was accompanied by a steady increase in the degradation activity of the catalysts. XPS analyses revealed that compared to Au/TiO2, on Au-FeOx/TiO2 a much higher population density of chemisorbed and/or dissociated oxygen species was generated, which together with the decreased bandgap resulted in the highest photocatalytic activity observed with Au-FeOx (1:2)/TiO2. The processes occurring during reaction on the catalyst surface and in the bulk liquid phase were investigated using operando attenuated total reflection IR spectroscopy (ATR-IR) combined with modulation excitation spectroscopy (MES), which showed that the doping of Au/TiO2 with FeOx weakens the interaction of the dye with the catalyst surface and strongly enhances the cleavage of the azo bond.
URI: https://digitalcollection.zhaw.ch/handle/11475/20356
Volltext Version: Publizierte Version
Lizenz (gemäss Verlagsvertrag): CC BY 4.0: Namensnennung 4.0 International
Departement: School of Engineering
Organisationseinheit: Institute of Materials and Process Engineering (IMPE)
Enthalten in den Sammlungen:Publikationen School of Engineering

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Waheed, A., Shi, Q., Maeda, N., Meier, D. M., Qin, Z., Li, G., & Baiker, A. (2020). Strong activity enhancement of the photocatalytic degradation of an azo dye on Au/TiO2 doped with FeOx. Catalysts, 10(8), 933. https://doi.org/10.3390/catal10080933
Waheed, A. et al. (2020) ‘Strong activity enhancement of the photocatalytic degradation of an azo dye on Au/TiO2 doped with FeOx’, Catalysts, 10(8), p. 933. Available at: https://doi.org/10.3390/catal10080933.
A. Waheed et al., “Strong activity enhancement of the photocatalytic degradation of an azo dye on Au/TiO2 doped with FeOx,” Catalysts, vol. 10, no. 8, p. 933, Aug. 2020, doi: 10.3390/catal10080933.
WAHEED, Ammara, Quanquan SHI, Nobutaka MAEDA, Daniel Matthias MEIER, Zhaoxian QIN, Gao LI und Alfons BAIKER, 2020. Strong activity enhancement of the photocatalytic degradation of an azo dye on Au/TiO2 doped with FeOx. Catalysts. 13 August 2020. Bd. 10, Nr. 8, S. 933. DOI 10.3390/catal10080933
Waheed, Ammara, Quanquan Shi, Nobutaka Maeda, Daniel Matthias Meier, Zhaoxian Qin, Gao Li, and Alfons Baiker. 2020. “Strong Activity Enhancement of the Photocatalytic Degradation of an Azo Dye on Au/TiO2 Doped with FeOx.” Catalysts 10 (8): 933. https://doi.org/10.3390/catal10080933.
Waheed, Ammara, et al. “Strong Activity Enhancement of the Photocatalytic Degradation of an Azo Dye on Au/TiO2 Doped with FeOx.” Catalysts, vol. 10, no. 8, Aug. 2020, p. 933, https://doi.org/10.3390/catal10080933.


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