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

• Type: Article in International Scientific Journal
• Date: 2015

Authors

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

Journal

Title: Applied Catalysis B: Environmental

Vol. 170

Pages: 74-82

ISSN: 0926-3373

Publisher: Elsevier

Indexing

ISI Web of Knowledge - 42 Citations

ISI Web of Science

Scopus - 52 Citations

Scientific classification

FOS: Engineering and technology > Chemical engineering

Associated Projects

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

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

Other information

Authenticus ID: 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.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 9