2002
DOI: 10.1016/s1011-1344(02)00277-4
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Reaction pathways and mechanisms of photodegradation of pesticides

Abstract: 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 het… Show more

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Cited by 569 publications
(315 citation statements)
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References 266 publications
(140 reference statements)
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“…Direct irradiation of those may lead to the promotion of the pesticide molecules to their excited singlet states, which may then intersystem cross to produce triplet states. Such excited states can then undergo, among other processes: (i) homolysis, (ii) heterolysis or (iii) photoionization [21]. Photodegradation of 2,4-D in aqueous solution by UV irradiation may also take place via C Cl and C O bond homolysis, with a subsequent cascade of various free radical reactions [22].…”
Section: Degradation Of 24-d With Uv Lightmentioning
confidence: 99%
“…Direct irradiation of those may lead to the promotion of the pesticide molecules to their excited singlet states, which may then intersystem cross to produce triplet states. Such excited states can then undergo, among other processes: (i) homolysis, (ii) heterolysis or (iii) photoionization [21]. Photodegradation of 2,4-D in aqueous solution by UV irradiation may also take place via C Cl and C O bond homolysis, with a subsequent cascade of various free radical reactions [22].…”
Section: Degradation Of 24-d With Uv Lightmentioning
confidence: 99%
“…The authors proposed a complex mechanism, including oxidation, dealkylation, and hydrolysis, and also suggested a significant involvement of radicals in these processes. For the mechanism of photodegradation of pesticides and the associated reaction pathways, we redirect to the review by Burrows, Canle L, Santaballa, and Steenken (2002).…”
Section: Uv Lightmentioning
confidence: 99%
“…Direct irradiation will lead to the promotion of the pesticides to their excited singlet states and such excited states can then undergo among homolysis, heterolysis or photoionization processes (Burrows et al, 2002). Direct photodegradation by solar light is limited and various lamps have been used for irradiation of contaminated water solutions.…”
Section: Photolysismentioning
confidence: 99%
“…Direct photodegradation by solar light is limited and various lamps have been used for irradiation of contaminated water solutions. The photolysis of contaminants (including pesticides) in aqueos solution depends on the different reaction parameters such as type of light, lamp distance, temperature, initial concentration of pesticides, type of water, pH, the presence of humic and fulvic acids, the presence of O 2 , O 3 , O 2 /O 3 and H 2 O 2 , the presence of inorganic ions and organic matter dissolved in water (Burrows et al, 2002;Tomaševic at al., 2010a).…”
Section: Photolysismentioning
confidence: 99%