Azo dye degradation by high-energy irradiation

Kinetics and mechanism of destruction

E. Takács, L. Wojnárovits, Tamás Pálfi

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

The kinetics and mechanism of dye destruction is discussed on the example of Apollofix Red (AR-28) and Reactive Black 5 (RB-5) radiolysis in dilute aqueous solution. The dose dependence of colour disappearance is linear when the reactive intermediate reacts with the colour bearing part of the molecule causing destruction of the conjugation here with nearly 100% efficiency. In this case, spectrophotometry can be used to follow-up dye decomposition. Such a linear dependence was observed when hydrated electrons or hydrogen atoms reacted with the dye. However, in the case of hydroxyl radical reactions some coloured products form with absorption spectra very similar to those of the starting dye molecules. For that reason, spectrophotometric measurements give false results about the concentration of intact dye molecules. Analysis made by the HPLC (high-pressure liquid chromatography) method reveals logarithmic time dependence in agreement with a theoretical model developed.

Original languageEnglish
Pages (from-to)69-75
Number of pages7
JournalNukleonika
Volume52
Issue number2
Publication statusPublished - 2007

Fingerprint

Azo Compounds
Azo dyes
destruction
dye
irradiation
Coloring Agents
Dyes
dyes
Irradiation
degradation
Degradation
kinetics
Kinetics
Remazol black B
energy
Molecules
Bearings (structural)
High pressure liquid chromatography
Color
color

Keywords

  • Apollofix Red
  • Azo dyes
  • Decolouration
  • Kinetics
  • Reaction mechanism
  • Reactive Black 5

ASJC Scopus subject areas

  • Inorganic Chemistry
  • Physics and Astronomy(all)
  • Nuclear and High Energy Physics

Cite this

Azo dye degradation by high-energy irradiation : Kinetics and mechanism of destruction. / Takács, E.; Wojnárovits, L.; Pálfi, Tamás.

In: Nukleonika, Vol. 52, No. 2, 2007, p. 69-75.

Research output: Contribution to journalArticle

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