Ozonation of bezafibrate over ceria and ceria supported on carbon materials

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

Autores

Alexandra G. Gonçalves (Autor) FEUP; José J. M. Orfão (Autor) FEUP; Manuel Fernando R. Pereira (Autor) FEUP

Revista

Título: ENVIRONMENTAL TECHNOLOGY

Vol. 36 Nº 4

Páginas: 776-785

ISSN: 0959-3330

Editora: Taylor & Francis

Indexação

ISI Web of Knowledge - 7 Citações

Scopus - 11 Citações

INSPEC

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-5H7

DOI: 10.1080/09593330.2014.961563

Abstract (EN): Two catalysts containing ceria dispersed on the surface of multi-walled carbon nanotubes and activated carbon were investigated as ozonation catalysts for the mineralization of bezafibrate (BZF). The results were compared with those obtained in the absence of the catalyst and in the presence of the parent carbon materials, as well as in the presence of ceria (CeO2). Carbon materials containing ceria showed an interesting catalytic effect. Both materials enhanced the mineralization of BZF relatively to single ozonation and ozonation catalysed by the corresponding carbon materials. In the catalytic ozonation with these materials, both surface and bulk reactions are supposed to occur. The BZF ozonation catalysed by CeO2 leaded to the highest mineralization degrees, indicating that the reaction mechanism followed in the presence of CeO2 (free radical oxidation in solution) leads to the formation of intermediates more easily degradable, mainly after 120 min of reaction. Some primary products and refractory final oxidation compounds in single and catalytic ozonation of BZF were followed. The original chlorine present on the BZF molecule is completely converted to chloride anion and part of the nitrogen is mainly converted to [GRAPHICS] along with smaller amounts of [GRAPHICS] and [GRAPHICS] . Microtox tests revealed that simultaneous use of ozone and CeO2 originated lower acute toxicity.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 10