Please use this identifier to cite or link to this item:
https://doi.org/10.21256/zhaw-20356
Publication type: | Article in scientific journal |
Type of review: | Peer review (publication) |
Title: | Strong activity enhancement of the photocatalytic degradation of an azo dye on Au/TiO2 doped with FeOx |
Authors: | 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 |
Published in: | Catalysts |
Volume(Issue): | 10 |
Issue: | 8 |
Page(s): | 933 |
Issue Date: | 13-Aug-2020 |
Publisher / Ed. Institution: | MDPI |
ISSN: | 2073-4344 |
Language: | English |
Subjects: | Orange II; Operando; Photocatalysis; Au-FeOx/TiO2; Modulation; Excitation; Spectroscopy |
Subject (DDC): | 660: Chemical engineering |
Abstract: | 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 |
Fulltext version: | Published version |
License (according to publishing contract): | CC BY 4.0: Attribution 4.0 International |
Departement: | School of Engineering |
Organisational Unit: | Institute of Materials and Process Engineering (IMPE) |
Appears in collections: | Publikationen School of Engineering |
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2020_Waheed_Strong_activity_enhancement_of_the_photocatalytic_degradation_Catalysts.pdf | 6.37 MB | Adobe PDF | View/Open |
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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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