Photocatalytic degradation of thiocarbamate herbicide active ingredients in water

A. Vidal, Z. Dinya, F. Mogyorodi, F. Mogyorodi

Research output: Contribution to journalArticle

57 Citations (Scopus)

Abstract

It has been shown that a wide range of organic compounds in aqueous solutions is photocatalytically oxidized to carbon dioxide in the presence of titanium dioxide with near-UV radiation. The photocatalytic mineralization of thiocarbamate derivative pesticides (EPTC, butylate, molinate, vernolate and cycloate) in water by illuminated TiO2 has been studied. The determination of the effects of various kinetic factors on the photocatalytic degradation and the determination of the nature of the principal intermediates form part of the focus of this study. The degradation rate of these thiocarbamates in a continuous recirculation mode approximates first-order kinetics. It was demonstrated that photocatalyzed degradation of thiocarbamate active ingredients does not occur instantaneously to form carbon dioxide, but through the formation of long-lived intermediate species. Photocatalytic intermediates detected during the degradation of thiocarbamates were identified by GC/MS techniques. Intermediates detected in the photocatalytic oxidation of thiocarbamates in water solutions are in excellent agreement with products identified from the atmospherically important reactions of OH radical with thiocarbamates. Particular attention will be paid to the carbon dioxide formed from the illuminated suspension in order to demonstrate not only apparent destruction but also complete mineralization. The degradation of a two-component mixture was carried out and compared to results obtained with single-component studies.

Original languageEnglish
Pages (from-to)259-267
Number of pages9
JournalApplied Catalysis B: Environmental
Volume21
Issue number4
DOIs
Publication statusPublished - Aug 2 1999

Fingerprint

Thiocarbamates
Herbicides
herbicide
Degradation
degradation
Water
Carbon dioxide
Carbon Dioxide
carbon dioxide
water
mineralization
kinetics
Kinetics
Pesticides
Organic compounds
Ultraviolet radiation
Titanium dioxide
organic compound
aqueous solution
pesticide

Keywords

  • Photocatalysis
  • Thiocarbamate herbicides
  • Titanium dioxide
  • Water treatment

ASJC Scopus subject areas

  • Catalysis
  • Process Chemistry and Technology
  • Environmental Chemistry

Cite this

Photocatalytic degradation of thiocarbamate herbicide active ingredients in water. / Vidal, A.; Dinya, Z.; Mogyorodi, F.; Mogyorodi, F.

In: Applied Catalysis B: Environmental, Vol. 21, No. 4, 02.08.1999, p. 259-267.

Research output: Contribution to journalArticle

Vidal, A. ; Dinya, Z. ; Mogyorodi, F. ; Mogyorodi, F. / Photocatalytic degradation of thiocarbamate herbicide active ingredients in water. In: Applied Catalysis B: Environmental. 1999 ; Vol. 21, No. 4. pp. 259-267.
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