The DOI matches its Crossref record; 19 of the 19 references it cites were found in a registry or an index.
Mechanism and Kinetics of the OH-Radical Intervention during Fenton Oxidation in the Presence of a Significant Amount of Radical Scavenger (Cl-)
Abstract
Orange II, the 4-(2-hydroxy-1-naphthylazo)benzenesulfonic acid Na-salt, was taken as a model for the oxidation of organic compounds in photoassisted Fenton process in the presence of Cl - -anion in solution. The HO • radicals seem to originate due to the photolysis of Fe(OH) 2+ complexes in solution, whereas the Cl 2 - • radical was a product of the photolysis of the FeCl 2+ complexes. The rate constants for the reaction of HO • and Cl 2 - • radicals with Or II were determined by laser kinetic spectroscopy: k OH • +OrII = 6.0 × 10 9 (M s) - 1 and k Cl2 • +OrII = 3.7 × 10 7 (M s) - 1 . A significant decrease in the rate of decoloration was observed for Orange II upon addition of Cl - (10 mM), but further addition of Cl - only marginally affected the latter reaction rate. Chlorinated hydrocarbons are observed as the products of Orange II oxidation in photoassisted and dark Fenton processes in the presence of Cl - anions. Light irradiation was observed to decrease the amount of chlorinated organic products (AOX) in solution as compared to dark Fenton processes. The results obtained are shown to be in agreement with the radical reaction theory for the particular case of the Fenton reaction. Kinetic modeling of the Orange II decoloration was carried out taking into consideration the rate constants found for the reaction k HO • +OrII and k Cl2 • +OrII .
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Cited by
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Decontamination and disinfection of water by solar photocatalysis: Recent overview and trends
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Giannakis, S., Lin, K.-Y. A., & Ghanbari, F. (2021) · Chemical Engineering Journal · doi:10.1016/j.cej.2020.127083 · Cited by 1,340
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Metadata
- Authors
- Kiwi, J., Lopez, A., & Nadtochenko, V.
- Venue
- Environmental Science & Technology
- Publisher
- American Chemical Society (ACS)
- Published
- 2000-04-19
- Volume
- 34
- Issue
- 11
- Pages
- 2162-2168
- ISSN
- 0013-936X (ISSN-L)
- 1520-5851
- OpenAlex
- W2041798693
- Cited by
- 349
- References
- 19
- FWCI
- 10.21
- Type
- journal article
- Language
- en
- Open access
- closed
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