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

• Type: Article in International Scientific Journal
• Date: 2009

Authors

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

Journal

Title: Chemosphere

Vol. 74

Pages: 818-824

ISSN: 0045-6535

Publisher: Elsevier

Indexing

ISI Web of Knowledge - 70 Citations

ISI Web of Science

Scopus - 88 Citations

COMPENDEX

Scientific classification

FOS: Engineering and technology

Other information

Authenticus ID: 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.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 7