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  • Volume 2, Issue 5-6

Photocatalytic degradation of propanil and molinate over TiO2 suspensions

T.A. Albanis, I.K. Konstantinou, V.A. Sakkas
Published December 2002, 2 (5-6) 225-232;
T.A. Albanis
Department of Chemistry, University of Ioannina, Ioannina 45110, Greece (E-mail: talbanis@cc.uoi.gr)
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I.K. Konstantinou
Department of Chemistry, University of Ioannina, Ioannina 45110, Greece (E-mail: talbanis@cc.uoi.gr)
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V.A. Sakkas
Department of Chemistry, University of Ioannina, Ioannina 45110, Greece (E-mail: talbanis@cc.uoi.gr)
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Abstract

The light-induced degradation of propanil and molinate under simulated solar irradiation has been investigated in aqueous solutions containing TiO2 suspensions as photocatalysts. The study focuses on the identification of possible intermediate products and the determination of inorganic ions formed during the process, using several powerful analytical techniques such as gas chromatography mass-spectrometry (GC-MS) and ion chromatography (IC). The primary degradation of propanil and molinate has been a fast process with half-lives varying from 4.3 to 2.9 minutes respectively, and followed pseudo-first-order kinetics according to the Langmuir-Hinshelwood model. The stoichiometric transformation of organic chlorine into chloride ion and organic sulfur to sulfate ions was observed for propanil and molinate respectively, whereas oxidation of nitrogen to nitrate ions took place at delayed irradiation times for both herbicides. The mineralization of the organic carbon to CO2 after 240 min of irradiation was found to be ≥ 95% for both herbicides. Various organic intermediates detected during the treatment have been identified by GC/MS techniques. Based on this by-product identification, a possible multi-step degradation scheme was proposed for each herbicide including hydroxylation, dechlorination, dealkylation and oxidation steps that lead to the mineralization of the starting molecule.

  • Molinate
  • photocatalytic oxidation
  • photoproduct analysis
  • propanil
  • TiO2
  • © IWA Publishing 2002

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Water Science and Technology: Water Supply: 18 (2)
  Volume 2, Issue 5-6

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Photocatalytic degradation of propanil and molinate over TiO2 suspensions
T.A. Albanis, I.K. Konstantinou, V.A. Sakkas
Water Science and Technology: Water Supply Dec 2002, 2 (5-6) 225-232;
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Photocatalytic degradation of propanil and molinate over TiO2 suspensions
T.A. Albanis, I.K. Konstantinou, V.A. Sakkas
Water Science and Technology: Water Supply Dec 2002, 2 (5-6) 225-232;

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Keywords

Molinate
photocatalytic oxidation
photoproduct analysis
propanil
TiO2
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