Carbon-based TiO2 materials for the degradation of Microcystin-LA

• Tipo: Artigo em Revista Científica Internacional
• Data: 2015

Autores

Maria J. Sampaio (Autor) FEUP; Cláudia G. Silva (Autor) FEUP; Adrián M. T. Silva (Autor) FEUP; Luisa M. Pastrana-Martínez (Autor) FEUP; Changseok Han (Autor) Outra; Sergio Morales-Torres (Autor) FEUP; José L. Figueiredo (Autor) FEUP; Dionysios D. Dionysiou (Autor) Outra; Joaquim L. Faria (Autor) FEUP

Revista

Título: Applied Catalysis B: Environmental

Vol. 170

Páginas: 74-82

ISSN: 0926-3373

Editora: Elsevier

Indexação

ISI Web of Knowledge - 42 Citações

ISI Web of Science

Scopus - 52 Citações

Classificação Científica

FOS: Ciências da engenharia e tecnologias > Engenharia química

Projetos Associados

LSRE-LCM - Laboratório de Processos de Separação e Reação - Laboratório de Catálise e Materiais

LA 20 - PROJECTO ESTRATÉGICO - LA 20 - 2013-2014

Outras Informações

ID Authenticus: P-00A-596

DOI: 10.1016/j.apcatb.2015.01.013

Abstract (EN): The photocatalytic degradation of a cyanobacterial toxin, microcystin-LA (MC-LA), was studied in aqueous solutions under both simulated solar light and visible light irradiation. Neat TiO2 and carbon-based TiO2 materials, prepared with carbon nanotubes (CNT) or graphene oxide (GO), were compared. The highest photocatalytic activity was obtained with a GO-TiO2 composite comprising 4 wt.% of carbon content (GO-TiO2-4). Complete conversion of MC-LA was achieved under solar light irradiation in 5 min. GO-TiO2-4 was also active under visible light illumination, with 88% of MC-LA removal in 2 h.The high photocatalytic activity of GO-TiO2-4 was attributed to the optimal assembly and interfacial coupling between the TiO2 nanoparticles and the GO sheets that can effectively inhibit electron/hole recombination. Reaction intermediates of MC-LA photocatalytic degradation were also identified by LC/Q-TOF and LC/MS/MS, most of them resulting from the attack of hydroxyl radicals to the MC-LA molecule under solar light irradiation.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 9