A detailed kinetic study of the direct photooxidation of 2,4,6-trichlorophenol

Jose Ángel Pino-Chamorro, Tamás Ditrói, G. Lente, I. Fábián

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

The direct photodegradation of 2,4,6-trichlorophenol (TCP) by UV–vis light was studied in aqueous solution in order to analyze the mechanism of the photochemical process and to determine the kinetic parameters including the quantum yield. Based on initial rate studies at different overall volumes and illumination patterns, it was proved that the rate of the process is directly proportional to the intensity of irradiating light. A significant, but moderate acceleration of the reaction rate with increasing temperature was revealed between 5.0 and 35.0 °C, which could be interpreted readily by assuming that the excited state of TCP is involved in two competing processes. High pressure liquid chromatography and mass spectrometry provided us information on the nature of the intermediates and the products formed. 2,6-Dichloro-1,4-benzoquinone, 3,5-dichloro-2-hydroxy-1,4-benzoquinone and 2,6-dihclorohydroxyquinone were detected as products and/or intermediates, and there were also hints of the formation of 3,5-dichlorobenzene-1,2-diol and 3,5-dichloro-1,2-benzoquinone. A possible degradation mechanism is proposed to interpret the kinetic findings.

Original languageEnglish
Pages (from-to)71-78
Number of pages8
JournalJournal of Photochemistry and Photobiology A: Chemistry
Volume330
DOIs
Publication statusPublished - Nov 1 2016

Fingerprint

Photooxidation
photooxidation
quinones
High pressure liquid chromatography
Kinetics
Photodegradation
kinetics
Quantum yield
Kinetic parameters
Excited states
Reaction rates
Mass spectrometry
Lighting
liquid chromatography
products
Degradation
reaction kinetics
mass spectroscopy
illumination
degradation

Keywords

  • 2,4,6–trichlorophenol
  • Chlorophenols
  • Kinetics
  • Light intensity dependence
  • Mechanism of reaction
  • Photochemical mechanism
  • Photodegradation
  • Polychromatic light
  • Quantitative photochemistry
  • Quantum yield
  • Temperature dependence

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Physics and Astronomy(all)

Cite this

A detailed kinetic study of the direct photooxidation of 2,4,6-trichlorophenol. / Pino-Chamorro, Jose Ángel; Ditrói, Tamás; Lente, G.; Fábián, I.

In: Journal of Photochemistry and Photobiology A: Chemistry, Vol. 330, 01.11.2016, p. 71-78.

Research output: Contribution to journalArticle

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AB - The direct photodegradation of 2,4,6-trichlorophenol (TCP) by UV–vis light was studied in aqueous solution in order to analyze the mechanism of the photochemical process and to determine the kinetic parameters including the quantum yield. Based on initial rate studies at different overall volumes and illumination patterns, it was proved that the rate of the process is directly proportional to the intensity of irradiating light. A significant, but moderate acceleration of the reaction rate with increasing temperature was revealed between 5.0 and 35.0 °C, which could be interpreted readily by assuming that the excited state of TCP is involved in two competing processes. High pressure liquid chromatography and mass spectrometry provided us information on the nature of the intermediates and the products formed. 2,6-Dichloro-1,4-benzoquinone, 3,5-dichloro-2-hydroxy-1,4-benzoquinone and 2,6-dihclorohydroxyquinone were detected as products and/or intermediates, and there were also hints of the formation of 3,5-dichlorobenzene-1,2-diol and 3,5-dichloro-1,2-benzoquinone. A possible degradation mechanism is proposed to interpret the kinetic findings.

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