Degradation pathways of emerging contaminants using TiO2-activated carbon heterostructures in aqueous solution under simulated solar light
Entity
UAM. Departamento de Ingeniería QuímicaPublisher
ElsevierDate
2020-03-23Citation
10.1016/j.cej.2020.124867
Chemical Engineering Journal 392 (2020): 124867
ISSN
1385-8947 (print)DOI
10.1016/j.cej.2020.124867Funded by
The authors acknowledge the financial support from Spanish MINECO (project CTQ2016-78576-R). M. Peñas-Garzón thanks Spanish MECD for FPU16/00576 grant. Authors thank the Research Support Services of the University of Extremadura (SAIUEx) for its technical and scientific supportProject
Gobierno de España. CTQ2016-78576-REditor's Version
https://doi.org/10.1016/j.cej.2020.124867Subjects
Activated Carbon; Pharmaceutical Degradation Pathways; Solar Photocatalysis; TiO2/Carbon-Heterostructures; Water Treatment; QuímicaRights
© 2020 Elsevier B.V.Esta obra está bajo una licencia de Creative Commons Reconocimiento-NoComercial-SinObraDerivada 4.0 Internacional.
Abstract
This work deals with the degradation of three emerging contaminants (acetaminophen, ibuprofen and antipyrine) in water under simulated solar light using different catalysts of TiO2/activated carbon heterostructures. The heterostructures, based on anatase phase, were successfully synthesized following three different methods (solvothermal, microwave-assisted and sol-gel), using lignin as carbon precursor. The sol-gel photocatalyst only yielded 50% conversion of acetaminophen and a low mineralization (15%), probably due to the higher crystal and particle size and lower surface area of this heterostructure, as a consequence of the higher temperature reached during the heat-treatment included in this synthesis route to achieve anatase crystallization. In contrast, the heterostructure prepared by the microwave-assisted procedure achieved complete conversion after 6 h of reaction. Regarding the contaminants, ibuprofen was the most easily removed, requiring 3 h for complete disappearance, while antipyrine showed the highest resistance to photodegradation, not being completely removed after 6 h. The photocatalytic performance was also evaluated for a mixture of these three pharmaceuticals at different initial pH. The fastest and highest mineralization (ca. 50%) occurred around neutral pH. The study proposes the oxidation degradation pathways of the three pharmaceuticals under solar-simulated irradiation from the analysis of the reaction intermediates
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Google Scholar:Peñas-Garzón, M.
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Gómez Avilés, Almudena
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Belver Coldeira, Carolina
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Rodríguez Jiménez, Juan José
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Bedia García-Matamoros, Jorge
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