Please use this identifier to cite or link to this item: https://hdl.handle.net/10216/115587
Author(s): Pedro Magalhães
Joana Ângelo
Olga C. Nunes
Adélio Mendes
Title: Enhanced methylene blue photodegradation with propylene carbonate as a solvent
Issue Date: 2018
Abstract: The role of water in the TiO2-based photocatalytic phenomenon is not yet fully understood. The photocatalysis of methylene blue dissolved in propylene carbonate and different concentrations of water was studied. It was observed that the photocatalytic activity of TiO2 (P25 from Evonik) peaks when propylene carbonate solvent is used with minute amounts of water; the maximum photodegradation rate was ca. 6.5 times higher than when just water solvent was used. The conventional interpretation of the methylene blue photooxidation intermediated by free radical OH. cannot explain these results. Alternately, the experimental results were interpreted based on the recently proposed "direct-indirect" (D-I) model and a mathematical model was successfully developed and fitted to the experimental results. Finally, new insights on the role of water in the photocatalytic phenomenon were withdrawn.
URI: https://hdl.handle.net/10216/115587
Related Information: info:eu-repo/grantAgreement/Comissão de Coordenação e Desenvolvimento Regional do Norte/P2020|Norte2020-Projetos Integrados ICDT/NORTE-01-0145-FEDER-000005/LEPABE-2-ECO-INNOVATION/LEPABE-2-ECO-INNOVATION
info:eu-repo/grantAgreement/FCT - Fundação para a Ciência e Tecnologia/Projetos Estratégicos/UID/EQU/00511/2013 - POCI-01-0145-FEDER-006939/Laboratório de Engenharia de Processos, Ambiente, Biotecnologia e Energia/LEPABE
Document Type: Artigo em Revista Científica Internacional
Rights: restrictedAccess
Appears in Collections:FEUP - Artigo em Revista Científica Internacional

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