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Photoassisted Degradation of Dye Pollutants. 8. Irreversible Degradation of Alizarin Red under Visible Light Radiation in Air-Equilibrated Aqueous TiO2 Dispersions
Open accessAbstract
Alizarin red undergoes rapid photoassisted decomposition in air-equilibrated aqueous TiO 2 dispersions under visible light radiation (λ > 420 nm). Proton NMR, chemical oxygen demand (COD Cr ), UV−visible, IR, GC−MS, and spin-trapping ESR spectroscopic techniques were employed to obtain details of the photodegradation of alizarin red. Peroxides and carbonyl species are the first intermediates observed during the process. The major component of the peroxides produced is H 2 O 2, and no organoperoxides were detected. We have also confirmed that in addition to CO 2 and to smaller carbonyl species the principal intermediate produced is phthalic acid, which is unable to degrade further because it does not absorb the actinic visible light radiation (λ > 420 nm). The photodegradation kinetics are discussed in terms of the Langmuir−Hinshelwood model, a case of saturation type kinetics. A mechanism for the photoassisted degradation of alizarin red mediated by TiO 2 particles under visible light radiation is proposed.
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Citations
Cited by
Explaining the Enhanced Photocatalytic Activity of Degussa P25 Mixed-Phase TiO 2 Using EPR
Hurum, D. C., Agrios, A. G., Gray, K. A., Rajh, T., & Thurnauer, M. C. (2003) · The Journal of Physical Chemistry B · doi:10.1021/jp0273934 · Cited by 2,015
Khataee, A. R., & Kasiri, M. B. (2010) · Journal of Molecular Catalysis A: Chemical · doi:10.1016/j.molcata.2010.05.023 · Cited by 641
Yin, M., Li, Z., Kou, J., & Zou, Z. (2009) · Environmental Science & Technology · doi:10.1021/es902011h · Cited by 490
UV light induced photodegradation of malachite green on TiO2 nanoparticles
CHEN, C., LU, C., CHUNG, Y., & JAN, J. (2007) · Journal of Hazardous Materials · doi:10.1016/j.jhazmat.2006.07.011 · Cited by 346
Degradation of Alizarin Red by electro-Fenton process using a graphite-felt cathode
Panizza, M., & Oturan, M. A. (2011) · Electrochimica Acta · doi:10.1016/j.electacta.2011.05.105 · Cited by 320
Gu, L., Wang, J., Zou, Z., & Han, X. (2014) · Journal of Hazardous Materials · doi:10.1016/j.jhazmat.2014.01.021 · Cited by 294
Zhao, D., Chen, C., Wang, Y., Ma, W., Zhao, J., Rajh, T., & Zang, L. (2008) · Environmental Science & Technology · doi:10.1021/es071770e · Cited by 194
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Metadata
- Authors
- Liu, G., Wu, T., Zhao, J., Hidaka, H., & Serpone, N.
- Venue
- Environmental Science & Technology
- Publisher
- American Chemical Society (ACS)
- Published
- 1999-05-06
- Volume
- 33
- Issue
- 12
- Pages
- 2081-2087
- ISSN
- 0013-936X (ISSN-L)
- 1520-5851
- OpenAlex
- W2028058395
- Cited by
- 261
- References
- 0
- FWCI
- 10.49
- Type
- journal article
- Language
- en
- Open access
- bronze
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