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Kinetic and mechanistic aspects of the direct photodegradation of atrazine, atr...
Azenha, M. E. D. G.; Burrows, H. D.; L., M. Canle; Coimbra, R.; Fernández, M. I.; García, M. V.; Peiteado, M. A.; Santaballa, J. A.Atrazine (1), Atraton (2) and Ametryn (3) are photodegraded upon 254 nm irradiation, yielding 2-OH-atrazine (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 characterisation by luminescence spectroscopy of uranium(VI) incorporated i...
Azenha, M. E. D. G.; Miguel, Maria da Graça; Formosinho, S. J.; Burrows, H. D.Luminescence spectroscopy of solids at 77 K has been used to characterise the uranium(VI) species incorporated into [alpha]-alumina, [gamma]-alumina and zeolites Y and ZSM-20 by adsorption from solution and into ZSM-5 by chemical synthesis. With uranyl adsorbed from nitrate solutions onto [alpha]- and [gamma]-aluminas, the luminescence measurements show the dominant uranium species is schoepite, UO3·xH2O, in ag...
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