Ionizing radiation induced degradation of monuron in dilute aqueous solution

Krisztina Kovács, Shijun He, Viktória Míle, Tamás Földes, I. Pápai, E. Takács, L. Wojnárovits

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

The decomposition of monuron was investigated in dilute aqueous solutions using pulse radiolysis and γ-radiolysis in order to identify the intermediates and final products. The main reaction takes place between monuron and the hydroxyl radicals yielding hydroxycyclohexadienyl type radicals with a second order rate constant of (7.4±0.2)×109 mol-1 dm3 s-1. In (bullet operator)OH reactions, the aminyl and phenoxyl radicals may also form. Dechlorination was observed in both hydroxyl radical and hydrated electron reactions. The (bullet operator)OH induced dechlorination reactions are suggested to occur through OH substitution or phenoxyl radical formation. The rate of oxidation is very high in the presence of dissolved oxygen. Some of the results are also supported by quantum chemical calculations.

Original languageEnglish
JournalRadiation Physics and Chemistry
DOIs
Publication statusAccepted/In press - Oct 5 2015

Fingerprint

ionizing radiation
degradation
aqueous solutions
hydroxyl radicals
radiolysis
operators
substitutes
decomposition
oxidation
oxygen
products
pulses
electrons

Keywords

  • Advanced oxidation processes
  • Hydroxyl radical
  • Monuron
  • Pesticides
  • Phenylureas

ASJC Scopus subject areas

  • Radiation

Cite this

Ionizing radiation induced degradation of monuron in dilute aqueous solution. / Kovács, Krisztina; He, Shijun; Míle, Viktória; Földes, Tamás; Pápai, I.; Takács, E.; Wojnárovits, L.

In: Radiation Physics and Chemistry, 05.10.2015.

Research output: Contribution to journalArticle

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