Carbon-nanotube/TiO2 materials synthesized by a one-pot oxidation/hydrothermal route for the photocatalytic production of hydrogen from biomass derivatives

• Tipo: Artigo em Revista Científica Internacional
• Data: 2020

Autores

Naffati, N (Autor) Outra; Sampaio, M.J. (Autor) FEUP; Da Silva, ES (Autor) FEUP; Nsib, MF (Autor) Outra; Arfaoui, Y (Autor) Outra; Houas, A (Autor) Outra; Joaquim Luís Faria (Autor) FEUP; Claudia G Silva (Autor) FEUP

Revista

Título: Materials Science in Semiconductor Processing

Vol. 115

ISSN: 1369-8001

Editora: Elsevier

Indexação

ISI Web of Knowledge - 0 Citações

Scopus - 6 Citações

Projetos Associados

IF/00514/2014/CP1249/CT0004 - Desafiando a síntese em química fina: uma nova abordagem utilizando fotocatalisadores isentos de metais

LED-NETmix - LED-NETmix: um fotoreator inovador para a intensificação de processos em síntese química

Outras Informações

ID Authenticus: P-00R-Z4G

DOI: 10.1016/j.mssp.2020.105098

Abstract (EN): Hybrid photocatalysts containing different amounts of carbon nanotubes (CNTs) and TiO2 were synthesized by a one-pot oxidation/hydrothermal route and used for hydrogen production from aqueous solutions of methanol and glycerol under UV-LED irradiation. Platinum nanoparticles (1 wt%) were used as co-catalysts. Different techniques, namely X-ray diffraction, transmission electron microscopy, photoluminescence, electrochemical impedance, diffuse reflectance UV-vis spectroscopy, thermogravimetry and N-2 adsorption were used to characterize the prepared materials. The presence of both CNTs and Pt has a great influence on the photocatalytic activity of CNT-Pt/TiO2 nanocomposites. The presence of CNTs extend the photo-response of TiO2 to the visible region, narrow its bandgap energy, enhance the charge mobility and reduce the electron/hole recombination. The hybrid material loaded with 1 wt% of CNT (1%CNT-Pt/TiO2), displayed the highest photoactivity for hydrogen production under UV-LED (384 nm) irradiation using both methanol and aqueous glycerol solutions, with 2327 and 2091 mu mol g(-1) of H-2 produced at the end of 2 h of irradiation, respectively. Also, this material showed excellent photostability during at least three cycles.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 7