Fundamental kinetic modeling of dye sensitization photocatalysis by oxygen vacancy enriched ZnO for the quantification of degradation by catalyst or dye sensitizer
- Author
- Alireza Ranjbari (UGent) , Jihee Yu, Juho Kim, Jiyun Kim, Mireu Park, Ki-Hyun Kim and Philippe Heynderickx (UGent)
- Organization
- Abstract
- Dye sensitization enhances catalyst reactivity using dye molecules to amplify light absorption. Researchers debate using dyes as model compounds due to uncertainty about whether degradation is driven by dye or the catalyst. Instead of avoiding this question, our approach involves understanding and quantifying the distinct roles of each component in the degradation process. This study investigated methylene blue (MB) sensitization of ZnO using a binary dye mixture of MB and methyl orange. A comprehensive kinetic model was developed to account for the function of MB sensitizer by simultaneously tracking the interaction of dyes across the catalyst surface and solution in pH range of 3 to 11. The effects of pH on dye adsorption were incorporated using dye speciation (pKa). The dye removal was kinetically modeled considering reversible adsorption/desorption and surface/aqueous degradation by the interaction between active radicals (in the solution) and electron-holes (on the catalyst surface). Additionally, the source of the generated electron hole (i.e., ZnO or MB sensitizer) was considered separately. Oxygen vacancy effects on dye adsorption and sensitization were explored through hydrogen reduction of ZnO at 500 °C. Characterization techniques assessed oxygen vacancy presence, while quantum yield calculations quantified MB sensitization's contribution to dye degradation versus the catalyst.
- Keywords
- Surfaces, Coatings and Films, Condensed Matter Physics, Surfaces and Interfaces, General Physics and Astronomy, General Chemistry
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Citation
Please use this url to cite or link to this publication: http://hdl.handle.net/1854/LU-01HSSE5T60X6WV9J5EJRE04VEX
- MLA
- Ranjbari, Alireza, et al. “Fundamental Kinetic Modeling of Dye Sensitization Photocatalysis by Oxygen Vacancy Enriched ZnO for the Quantification of Degradation by Catalyst or Dye Sensitizer.” APPLIED SURFACE SCIENCE, vol. 659, 2024, doi:10.1016/j.apsusc.2024.159867.
- APA
- Ranjbari, A., Yu, J., Kim, J., Kim, J., Park, M., Kim, K.-H., & Heynderickx, P. (2024). Fundamental kinetic modeling of dye sensitization photocatalysis by oxygen vacancy enriched ZnO for the quantification of degradation by catalyst or dye sensitizer. APPLIED SURFACE SCIENCE, 659. https://doi.org/10.1016/j.apsusc.2024.159867
- Chicago author-date
- Ranjbari, Alireza, Jihee Yu, Juho Kim, Jiyun Kim, Mireu Park, Ki-Hyun Kim, and Philippe Heynderickx. 2024. “Fundamental Kinetic Modeling of Dye Sensitization Photocatalysis by Oxygen Vacancy Enriched ZnO for the Quantification of Degradation by Catalyst or Dye Sensitizer.” APPLIED SURFACE SCIENCE 659. https://doi.org/10.1016/j.apsusc.2024.159867.
- Chicago author-date (all authors)
- Ranjbari, Alireza, Jihee Yu, Juho Kim, Jiyun Kim, Mireu Park, Ki-Hyun Kim, and Philippe Heynderickx. 2024. “Fundamental Kinetic Modeling of Dye Sensitization Photocatalysis by Oxygen Vacancy Enriched ZnO for the Quantification of Degradation by Catalyst or Dye Sensitizer.” APPLIED SURFACE SCIENCE 659. doi:10.1016/j.apsusc.2024.159867.
- Vancouver
- 1.Ranjbari A, Yu J, Kim J, Kim J, Park M, Kim K-H, et al. Fundamental kinetic modeling of dye sensitization photocatalysis by oxygen vacancy enriched ZnO for the quantification of degradation by catalyst or dye sensitizer. APPLIED SURFACE SCIENCE. 2024;659.
- IEEE
- [1]A. Ranjbari et al., “Fundamental kinetic modeling of dye sensitization photocatalysis by oxygen vacancy enriched ZnO for the quantification of degradation by catalyst or dye sensitizer,” APPLIED SURFACE SCIENCE, vol. 659, 2024.
@article{01HSSE5T60X6WV9J5EJRE04VEX,
abstract = {{Dye sensitization enhances catalyst reactivity using dye molecules to amplify light absorption. Researchers debate using dyes as model compounds due to uncertainty about whether degradation is driven by dye or the catalyst. Instead of avoiding this question, our approach involves understanding and quantifying the distinct roles of each component in the degradation process. This study investigated methylene blue (MB) sensitization of ZnO using a binary dye mixture of MB and methyl orange. A comprehensive kinetic model was developed to account for the function of MB sensitizer by simultaneously tracking the interaction of dyes across the catalyst surface and solution in pH range of 3 to 11. The effects of pH on dye adsorption were incorporated using dye speciation (pKa). The dye removal was kinetically modeled considering reversible adsorption/desorption and surface/aqueous degradation by the interaction between active radicals (in the solution) and electron-holes (on the catalyst surface). Additionally, the source of the generated electron hole (i.e., ZnO or MB sensitizer) was considered separately. Oxygen vacancy effects on dye adsorption and sensitization were explored through hydrogen reduction of ZnO at 500 °C. Characterization techniques assessed oxygen vacancy presence, while quantum yield calculations quantified MB sensitization's contribution to dye degradation versus the catalyst.}},
articleno = {{159867}},
author = {{Ranjbari, Alireza and Yu, Jihee and Kim, Juho and Kim, Jiyun and Park, Mireu and Kim, Ki-Hyun and Heynderickx, Philippe}},
issn = {{0169-4332}},
journal = {{APPLIED SURFACE SCIENCE}},
keywords = {{Surfaces, Coatings and Films,Condensed Matter Physics,Surfaces and Interfaces,General Physics and Astronomy,General Chemistry}},
language = {{eng}},
pages = {{19}},
title = {{Fundamental kinetic modeling of dye sensitization photocatalysis by oxygen vacancy enriched ZnO for the quantification of degradation by catalyst or dye sensitizer}},
url = {{http://doi.org/10.1016/j.apsusc.2024.159867}},
volume = {{659}},
year = {{2024}},
}
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