Please use this identifier to cite or link to this item: https://hdl.handle.net/10216/105986
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dc.creatorM. A. Sousa
dc.creatorO. Lacina
dc.creatorP. Hrádková
dc.creatorJ. Pulkrabová
dc.creatorVítor J. P. Vilar
dc.creatorC. Gonçalves
dc.creatorRui A. R. Boaventura
dc.creatorJ.Hajslová
dc.creatorM. F. Alpendurada
dc.date.accessioned2022-09-10T20:07:58Z-
dc.date.available2022-09-10T20:07:58Z-
dc.date.issued2013
dc.identifier.issn0043-1354
dc.identifier.othersigarra:70468
dc.identifier.urihttps://hdl.handle.net/10216/105986-
dc.description.abstractThis manuscript reports on the study of Lorazepam (LZP) phototransformation pathways under artificial UV and natural solar irradiation, through photolytic and TiO2-assisted photocatalytic processes. Three experimental set-ups were employed: two lab-scale photoreactors, each provided with an UV lamp (one medium pressure mercury lamp and one blacklight blue lamp), and a pilot-scale Solar Plant with Compound Parabolic Collectors (CPCs). Samples collected along the different phototreatment experiments were analyzed by ultra-high performance liquid chromatography-quadrupole-time-of-flight-mass spectrometry (UHPLC/QqToF-MS). The key assumption of the analytical approach was that related compounds (LZP and its by-products (LBPs)) provide identical "diagnostic fragment ions". Identification was also based on the chlorine atoms specific isotopic pattern, as well as accurate masses. Six major LBPs were identified and elucidated, with nominal [M+H]+ masses of 337, 303, 319, 275, 291 and 293Da. The proposed LZP photodegradation mechanism included the initial opening of the diazepinone seven-membered ring, followed by a rearrangement into a highly stabilized six-membered aromatic ring and subsequent cleavage and/or hydroxylation reactions. The evolution profiles of LBPs were described for each of the three experimental prototypes and the CPCs Solar Pilot Plant proved to be the most efficient one. Finally, LZP photocatalytic degradation was further assessed on a municipal effluent, where the photoproducts generated showed to be more persistent than LZP itself. (c) 2013 Elsevier Ltd.
dc.language.isoeng
dc.relationinfo:eu-repo/grantAgreement/FCT - Fundação para a Ciência e a Tecnologia/Programa de Financiamento Plurianual de Unidades de I&D/PEst-C/EQB/LA0020/2011/Projeto Estratégico-LA 20 - 2011-2012/LA 20
dc.relationinfo:eu-repo/grantAgreement/FCT - Fundação para a Ciência e a Tecnologia/Projectos de I&DT em Todos os Domínios Científicos/PTDC/AAC-AMB/113091/2009/Eliminação de micropoluentes com actividade antimicrobiana de águas residuais/PTDC/AAC-AMB/113091/2009
dc.rightsrestrictedAccess
dc.subjectCiências Tecnológicas, Ciências da engenharia e tecnologias
dc.subjectTechnological sciences, Engineering and technology
dc.titleLorazepam photofate under photolysis andTiO2-assisted photocatalysis: Identification and evolution profiles of by-products formed during phototreatment of a WWTP effluent
dc.typeArtigo em Revista Científica Internacional
dc.contributor.uportoFaculdade de Engenharia
dc.identifier.doi10.1016/j.watres.2013.06.029
dc.identifier.authenticusP-008-E8B
dc.subject.fosCiências da engenharia e tecnologias
dc.subject.fosEngineering and technology
Appears in Collections:FEUP - Artigo em Revista Científica Internacional

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