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Please use this identifier to cite or link to this item: https://doi.org/10.21256/zhaw-20356
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dc.contributor.authorWaheed, Ammara-
dc.contributor.authorShi, Quanquan-
dc.contributor.authorMaeda, Nobutaka-
dc.contributor.authorMeier, Daniel Matthias-
dc.contributor.authorQin, Zhaoxian-
dc.contributor.authorLi, Gao-
dc.contributor.authorBaiker, Alfons-
dc.date.accessioned2020-08-17T08:34:17Z-
dc.date.available2020-08-17T08:34:17Z-
dc.date.issued2020-08-13-
dc.identifier.issn2073-4344de_CH
dc.identifier.urihttps://digitalcollection.zhaw.ch/handle/11475/20356-
dc.description.abstractThe 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.de_CH
dc.language.isoende_CH
dc.publisherMDPIde_CH
dc.relation.ispartofCatalystsde_CH
dc.rightshttps://creativecommons.org/licenses/by/4.0/de_CH
dc.subjectOrange IIde_CH
dc.subjectOperandode_CH
dc.subjectPhotocatalysisde_CH
dc.subjectAu-FeOx/TiO2de_CH
dc.subjectModulationde_CH
dc.subjectExcitationde_CH
dc.subjectSpectroscopyde_CH
dc.subject.ddc660: Technische Chemiede_CH
dc.titleStrong activity enhancement of the photocatalytic degradation of an azo dye on Au/TiO2 doped with FeOxde_CH
dc.typeBeitrag in wissenschaftlicher Zeitschriftde_CH
dcterms.typeTextde_CH
zhaw.departementSchool of Engineeringde_CH
zhaw.organisationalunitInstitute of Materials and Process Engineering (IMPE)de_CH
dc.identifier.doi10.3390/catal10080933de_CH
dc.identifier.doi10.21256/zhaw-20356-
zhaw.funding.euNode_CH
zhaw.issue8de_CH
zhaw.originated.zhawYesde_CH
zhaw.pages.start933de_CH
zhaw.publication.statuspublishedVersionde_CH
zhaw.volume10de_CH
zhaw.publication.reviewPeer review (Publikation)de_CH
zhaw.webfeedProzesstechnikde_CH
zhaw.webfeedVerfahrenstechnikde_CH
zhaw.author.additionalNode_CH
zhaw.display.portraitYesde_CH
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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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