Radiolytic decomposition of aqueous atrazine

Angelini, Giancarlo; Bucci, R.; Carnevaletti, F.; Colosimo, M.

doi:10.1016/s0969-806x(00)00270-x

Cited by 25 publications

(13 citation statements)

References 12 publications

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“…15 Amongst the photocatalysts tested, titanium dioxide, 10,11 polyoxometalates, 12 riboflavin 13 and porphyrin and phthalocyanine derivatives 14 have been shown to be particularly efficient.…”

Section: Introductionmentioning

confidence: 99%

Kinetic and mechanistic aspects of the direct photodegradation of atrazine, atraton, ametryn and 2‐hydroxyatrazine by 254 nm light in aqueous solution

Azenha

Burrows

Coimbra

et al. 2003

J of Physical Organic Chem

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Atrazine (1), Atraton (2) and Ametryn (3) are photodegraded upon 254 nm irradiation, yielding 2-OHatrazine (4) as a photoproduct. Dealkylation products are also generated, and 4-ethylamino-6-isopropylamino-(1,3,5)-triazine was also found as a photoproduct of 3. The main photoreaction is proposed to be an addition-elimination, yielding 4, which subsequently photodegrades. The ease of photodegradation depends on the electron availability at position C-2, the observed order of photoreactivity being 1 > 3 > 4 > 2.

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Section: Introductionmentioning

confidence: 99%

Kinetic and mechanistic aspects of the direct photodegradation of atrazine, atraton, ametryn and 2‐hydroxyatrazine by 254 nm light in aqueous solution

Azenha

Burrows

Coimbra

et al. 2003

J of Physical Organic Chem

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“…growth and of concentration of photosynthetic pigments of Atrazine (vide supra) was shown to be completely the above microalgae upon a 96-h treatment with the pure destroyed in aqueous solution upon g-irradiation using herbicides, as well as with solutions of the same that had 60 doses of 0.1-50 kGy from a Co source [288]. Ethylbeen photolysed with 248 nm light were measured.…”

mentioning

confidence: 97%

Reaction pathways and mechanisms of photodegradation of pesticides

Burrows

Santaballa

Steenken

2002

Journal of Photochemistry and Photobiology B: Biology

568

286

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The photodegradation of pesticides is reviewed, with particular reference to the studies that describe the mechanisms of the processes involved, the nature of reactive intermediates and final products. Potential use of photochemical processes in advanced oxidation methods for water treatment is also discussed. Processes considered include direct photolysis leading to homolysis or heterolysis of the pesticide, photosensitized photodegradation by singlet oxygen and a variety of metal complexes, photolysis in heterogeneous media and degradation by reaction with intermediates generated by photolytic or radiolytic means.

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“…[9][10][11] As a consequence, public concern has grown about the long-term environmental and health effects of such pollutants. [12,13] Many different techniques, including chlorination, [14] ozonation, [15] H 2 O 2 -promoted oxidation, [16] biological degradation, [17] Fenton oxidation, [18] radiolysis, [19] photocatalysis, [20] photosensitization, [21] and reduction, [22] have been attempted with questionable success to promote the degradation or elimination of these pollutants. A possible alternative is direct photodegradation, for which a number of studies on photoproducts have been performed, but little mechanistic information is available.…”

mentioning

confidence: 99%

On the Low‐Lying Excited States of sym‐Triazine‐Based Herbicides

et al. 2005

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We report a joint computational and luminescence study on the low-lying excited states of sym-triazines, namely, 1,3,5-triazine (1) and the ubiquitous herbicides atrazine [6-chloro-N2-ethyl-N4-isopropyl-1,3,5-triazine-2,4-diamine (2)] and ametryn [6-methylthio-N2-ethyl-N4-isopropyl-1,3,5-triazine-2,4-diamine (3)]. Geometrical structures, energetics, and transition and state properties of I and 2 were computed at the TD-DFT, CASSCF, and CASPT2 levels of theory. The fluorescence and phosphorescence emission spectra, lifetimes, and fluorescence quantum yields were measured for the three compounds, and from these, the energies of the lowest excited states and their corresponding radiative rates were determined. The predictions from CASPT2 calculations are in good agreement with the experimental results obtained from the luminescence studies and allow the interpretation of different absorption and emission features.

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Radiolytic decomposition of aqueous atrazine

Cited by 25 publications

References 12 publications

Kinetic and mechanistic aspects of the direct photodegradation of atrazine, atraton, ametryn and 2‐hydroxyatrazine by 254 nm light in aqueous solution

Kinetic and mechanistic aspects of the direct photodegradation of atrazine, atraton, ametryn and 2‐hydroxyatrazine by 254 nm light in aqueous solution

Reaction pathways and mechanisms of photodegradation of pesticides

On the Low‐Lying Excited States of sym‐Triazine‐Based Herbicides

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