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Effect of Transition Metal Ions on the TiO2-Assisted Photodegradation of Dyes under Visible Irradiation: A Probe for the Interfacial Electron Transfer Process and Reaction Mechanism
Abstract
The effect of metal ions (Cu 2+, Fe 3+, Zn 2+, Al 3+, and Cd 2+ ) on the photodegradation of several dyes: sulfo-rhodamine B (SRB), alizarin red (AR), and malachite green (MG) has been investigated in aqueous TiO 2 dispersions under visible irradiation (λ > 420 nm). Trace quantities of transition metal ions such as Cu 2+ and Fe 3+ having suitable redox potentials alter the electron-transfer pathway involving the dye, O 2 and TiO 2 particles, and markedly depress the photodegradation of all three dyes under visible irradiation. Other metal ions, such as Zn 2+, Cd 2+, and Al 3+, have only a slight influence on the photoreaction by altering the adsorption of dyes. Photogeneration of H 2 O 2 and reactive radicals, and the changes in fluorescence emission of SRB in TiO 2 aqueous dispersions were examined to elucidate the role of the metal ions. Addition of Cu 2+ or Fe 3+ decreases the reduction of O 2 by the conduction electrons, subsequently blocks the formation of reactive oxygen species (O -•, • OH), and depresses the degradation of dyes under visible irradiation. We deduce that the reduction of O 2 is essential for the photodegradation of dyes under visible irradiation.
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Environmental applications of semiconductor photocatalysis
Hoffmann, M. R., Martin, S. T., Choi, W., & Bahnemann, D. W. (1995) · Chemical Reviews · doi:10.1021/cr00033a004 · Cited by 18,495
Photocatalysis on TiO2 Surfaces: Principles, Mechanisms, and Selected Results
Linsebigler, A. L., Lu, G., & Yates, J. T. (1995) · Chemical Reviews · doi:10.1021/cr00035a013 · Cited by 11,575
Cited by
A review on the visible light active titanium dioxide photocatalysts for environmental applications
Pelaez, M., Nolan, N. T., Pillai, S. C., Seery, M. K., Falaras, P., Kontos, A. G., Dunlop, P. S. M., Hamilton, J. W. J., Byrne, J. A., O'Shea, K., et al. (2012) · Applied Catalysis B: Environmental · doi:10.1016/j.apcatb.2012.05.036 · Cited by 4,047
Ajmal, A., Majeed, I., Malik, R. N., Idriss, H., & Nadeem, M. A. (2014) · RSC Adv. · doi:10.1039/c4ra06658h · Cited by 1,485
Yin, M., Li, Z., Kou, J., & Zou, Z. (2009) · Environmental Science & Technology · doi:10.1021/es902011h · Cited by 490
Gopinath, K. P., Madhav, N. V., Krishnan, A., Malolan, R., & Rangarajan, G. (2020) · Journal of Environmental Management · doi:10.1016/j.jenvman.2020.110906 · Cited by 449
Metadata
- Authors
- Chen, C., Li, X., Ma, W., Zhao, J., Hidaka, H., & Serpone, N.
- Venue
- The Journal of Physical Chemistry B
- Publisher
- American Chemical Society (ACS)
- Published
- 2001-12-14
- Volume
- 106
- Issue
- 2
- Pages
- 318-324
- ISSN
- 1520-5207 (ISSN-L)
- 1520-6106
- OpenAlex
- W2053439032
- Cited by
- 389
- References
- 2
- FWCI
- 4.41
- Type
- journal article
- Language
- en
- Open access
- closed
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- Chen, C., Li, X., Ma, W., Zhao, J., Hidaka, H., & Serpone, N. (2002). Effect of Transition Metal Ions on the TiO2-Assisted Photodegradation of Dyes under Visible Irradiation: A Probe for the Interfacial Electron Transfer Process and Reaction Mechanism. The Journal of Physical Chemistry B. https://doi.org/10.1021/jp0119025
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