Photocatalytic synthesis of vanillin using N-doped carbon nanotubes/ZnO catalysts under UV-LED irradiation

• Tipo: Artigo em Revista Científica Internacional
• Data: 2018

Autores

Sampaio, M.J. (Autor) FEUP; Anas Benyounes (Autor) Outra; Philippe Serp (Autor) Outra; Joaquim Luís Faria (Autor) FEUP; Claúdia G Silva (Autor) FEUP

Revista

Título: Applied Catalysis A: General

Vol. 551

Páginas: 71-78

ISSN: 0926-860X

Editora: Elsevier

Indexação

ISI Web of Knowledge - 10 Citações

ISI Web of Science

Scopus - 27 Citações

Classificação Científica

CORDIS: Ciências Tecnológicas > Engenharia > Engenharia química

FOS: Ciências da engenharia e tecnologias > Engenharia química

Projetos Associados

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

Outras Informações

ID Authenticus: P-00N-MK9

DOI: 10.1016/j.apcata.2017.12.002

Abstract (EN): ZnO synthesized by solid-state thermal process was combined with different contents of nitrogen-doped carbon nanotubes (N-CNT). The materials were characterized by several techniques including thermogravimetric analysis, N-2 adsorption-desorption isotherms, scanning and transmission electron microscopies, and diffuse reflectance UV-vis and photoluminescence spectroscopies. The performance of neat ZnO and N-CNT/ZnO composite materials was evaluated in the selective photocatalytic oxidation of vanillyl alcohol into vanillin under UV-LED irradiation. The presence of the carbon phase in the composite materials (from 5.0 to 10 wt.%) revealed to be crucial for increasing the performance of the photocatalysts. The best performance for vanillyl alcohol oxidation was obtained using the composite containing 5% of carbon phase (5.0%N-CNT/ZnO), with an increase of 22% in vanillin concentration comparing to neat ZnO after 2 h of reaction. This enhancement in the efficiency of ZnO by the introduction of the carbon phase is attributed to the action of N-CNT as effective electron scavengers for ZnO, as revealed by the photoluminescence quenching, inhibiting the recombination of electrons and holes.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 8