Catalytic performance of heteroatom-modified carbon nanotubes in advanced oxidation processes

• Tipo: Artigo em Revista Científica Internacional
• Data: 2014

Autores

João Restivo (Autor) Outra; Raquel P. Rocha (Autor) FEUP; Adrián M. T. Silva (Autor) FEUP; José J. M. Orfão (Autor) FEUP; Manuel F. R. Pereira (Autor) FEUP; José L. Figueiredo (Autor) FEUP

Revista

Título: Chinese Journal of Catalysis

Vol. 35 Nº 6

Páginas: 896-905

ISSN: 0253-9837

Editora: Science Press

Indexação

ISI Web of Knowledge - 41 Citações

ISI Web of Science

Scopus - 40 Citações

Classificação Científica

FOS: Ciências da engenharia e tecnologias

CORDIS: Ciências Tecnológicas > Engenharia

Projetos Associados

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

Outras Informações

ID Authenticus: P-009-JMP

DOI: 10.1016/s1872-2067(14)60103-0

Abstract (EN): Multi-walled carbon nanotubes (CNTs) were submitted to chemical and thermal treatments in order to incorporate different heteroatoms on the surface. O-, S- and N-containing groups were successfully introduced onto the CNTs without significant changes of the textural properties. The catalytic activity of these heteroatom-modified CNTs was studied in two liquid phase oxidation processes: catalytic ozonation and catalytic wet air oxidation (CWAO), using oxalic acid and phenol as model compounds. In both cases, the presence of strongly acidic O-containing groups was found to decrease the catalytic activity of the CNTs. On the other hand, the introduction of S species (mainly sulfonic acids) enhanced the removal rate of the model compounds, particularly in the CWAO of phenol. Additional experiments were performed with a radical scavenger and sodium persulfate, in order to clarify the reaction mechanism. Nitrogen functionalities improve the catalytic performance of the original CNTs, regardless of the process or of the pollutant.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 10