Cerium, manganese and cobalt oxides as catalysts for the ozonation of selected organic compounds

• Tipo: Artigo em Revista Científica Internacional
• Data: 2009

Autores

P.C.C. Faria (Autor) FEUP; D.C.M. Monteiro (Autor) Outra; J.J.M. Órfão (Autor) FEUP; M.F.R. Pereira (Autor) FEUP

Revista

Título: Chemosphere

Vol. 74

Páginas: 818-824

ISSN: 0045-6535

Editora: Elsevier

Indexação

ISI Web of Knowledge - 70 Citações

ISI Web of Science

Scopus - 88 Citações

COMPENDEX

Classificação Científica

FOS: Ciências da engenharia e tecnologias

Outras Informações

ID Authenticus: P-003-NBX

DOI: 10.1016/j.chemosphere.2008.10.016

Abstract (EN): Several metal oxides, as well as metal oxides supported on activated carbon, were assessed as ozonation catalysts for the removal of selected organic compounds. Two transition metals (Mn, Co) and one rare earth element (Ce) were chosen for the preparation of the two series of catalysts. These materials were used in the ozonation of two aromatic compounds (aniline and sulfanilic acid) and one textile azo dye (Cl Acid Blue 113). The results were compared with those obtained with non-catalytic ozonation. All the tested materials were found to be effective ozonation catalysts. Among the metal oxides, those containing mixtures of cerium and manganese or cerium and cobalt enabled the highest mineralisation degrees. After 120 min of reaction the TOC removal achieved with Ce-Mn-O was 63% for sulfanilic acid and 67% for aniline, while Ce-Co-O allowed TOC removals of 58 and 66%, respectively. With single ozonation, the mineralisation of sulfanilic acid and aniline solutions was 34% and 40% after identical reaction period. Regarding the metal oxides supported on activated carbon, cerium and manganese oxides were, in general, the most active for the degradation of the studied compounds.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 7