Photolysis of atrazine in aqueous solution: role of process variables and reactive oxygen species
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Environmental Science and Pollution Research
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Photochemical advanced oxidation processes have
been considered for the treatment of water and wastewater
containing the herbicide atrazine (ATZ), a possible human
carcinogen and endocrine disruptor. In this study, we investigated the effects of the photon emission rate and initial concentration on ATZ photolysis at 254 nm, an issue not usually
detailed in literature. Moreover, the role of reactive oxygen
species (ROS) is discussed. Photon emission rates in the range
0.87×1018–3.6×1018 photons L−1 s
−1 and [ATZ]0=5 and
20 mg L−1 were used. The results showed more than 65 %
of ATZ removal after 30 min. ATZ photolysis followed apparent first-order kinetics with k values and percent removals
decreasing with increasing herbicide initial concentration. A
fivefold linear increase in specific degradation rate constants
with photon emission rate was observed. Also, regardless the
presence of persistent degradation products, toxicity was efficiently removed after 60-min exposure to UV radiation.
Experiments confirmed a noticeable contribution of singlet
oxygen and radical species to atrazine degradation during
photolysis. These results may help understand the behavior
of atrazine in different UV-driven photochemical degradation
treatment processes.
Como referenciar
SILVA, MARCELA P.; BATISTA, ANA P. dos S.; BORRELY, SUELI I.; SILVA, VANESSA H.O.; TEIXEIRA, ANTONIO C.S.C. Photolysis of atrazine in aqueous solution: role of process variables and reactive oxygen species. Environmental Science and Pollution Research, v. 21, n. 21, p. 12135-12142, 2014. DOI: 10.1007/s11356-014-2881-0. Disponível em: http://repositorio.ipen.br/handle/123456789/23672. Acesso em: 30 Dec 2025.
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