The DOI matches its Crossref record; 1 of the 1 references it cites were found in a registry or an index.
Evidence for H2O2 Generation during the TiO2-Assisted Photodegradation of Dyes in Aqueous Dispersions under Visible Light Illumination
Abstract
Photodegradation of a series of dyes (Rhodamine B, Orange II, Sulfo-rhodamine B, Fluorescein, Alizarin red, Squarylium cyanine, and Eosin) in the presence of TiO 2 particles under air-equilibrated controlled conditions and visible light illumination led to the formation of hydrogen peroxide. Combined with chemical oxygen demand (COD) measurements and in situ adsorption of added H 2 O 2, the results reveal that H 2 O 2 is a perfidious intermediate species in the process of dye photodegradation. The formation rate of H 2 O 2 depends on the rate of dye degradation. It can also be decomposed by TiO 2 particles under visible light irradiation because of a TiO 2 /H 2 O 2 surface complex. H 2 O 2 was detected because its formation rate was greater than its decomposition rate; failing this, H 2 O 2 would not be observed. Its decomposition rate depends on the amount of substrates or intermediates formed during dye degradation and adsorbed on the surface of the TiO 2 particles. The greater the degradation rate of the dye or the greater the quantity of substrates or intermediates adsorbed on the TiO 2 surface, the less is the depletion of H 2 O 2 with the consequence that a large quantity of H 2 O 2 accumulates in the solution bulk permitting its facile detection. Also, pH appears to play a beneficial role in the observation of H 2 O 2 formed.
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Citations
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Metadata
- Authors
- Wu, T., Liu, G., Zhao, J., Hidaka, H., & Serpone, N.
- Venue
- The Journal of Physical Chemistry B
- Publisher
- American Chemical Society (ACS)
- Published
- 1999-05-22
- Volume
- 103
- Issue
- 23
- Pages
- 4862-4867
- ISSN
- 1520-5207 (ISSN-L)
- 1520-6106
- OpenAlex
- W2090932891
- Cited by
- 237
- References
- 1
- FWCI
- 12.67
- Type
- journal article
- Language
- en
- Open access
- closed
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