The electrochemical mineralization of oxalic and oxamic acids using modified electrodes based on carbon nanotubes

• Tipo: Artigo em Revista Científica Internacional
• Data: 2013

Autores

M. Ferreira (Autor) Outra; M.F. Pinto (Autor) Outra; O.S.G.P. Soares (Autor) FEUP; Manuel Fernando R Pereira (Autor) FEUP; José Melo Orfão (Autor) FEUP; José Luís Figueiredo (Autor) FEUP; I.C. Neves (Autor) Outra; A.M. Fonseca (Autor) Outra; P. Parpot (Autor) Outra

Revista

Título: Chemical Engineering Journal

Vol. 228

Páginas: 374-380

ISSN: 1385-8947

Editora: Elsevier

Indexação

ISI Web of Knowledge - 8 Citações

ISI Web of Science

Scopus - 11 Citações

Classificação Científica

FOS: Ciências da engenharia e tecnologias

Outras Informações

ID Authenticus: P-008-BBN

DOI: 10.1016/j.cej.2013.05.004

Abstract (EN): Constant current and constant potential electrolyses of oxalic and oxamic acids were carried out on multiwalled carbon nanotubes (CNT) and on monometallic (Pd and Pt) and bimetallic (Ru-Cu) catalysts supported on multiwalled carbon nanotubes. Both carboxylic acids were mineralized with high conversions via hypochlorite ion produced in situ, in 0.10 M NaCl medium. Highest current efficiency, corresponding to 97%, and highest reaction rate constant for oxalic acid mineralization were obtained for the Ru-Cu/CNT modified electrode, in 0.10 M NaCl medium. The mineralization of oxamic acid was achieved with a faradic yield of 96% and an energy consumption of 14.6 kWh (kg of pollutant)(-1) the same medium. The conversion values obtained for the oxidation of oxalic acid in 0.50 M NaOH medium, on Pt/CNT, Pd/CNT and Ru-Cu/CNT modified electrodes, were respectively 42%, 60% and 85%. In this last medium, 88% of the initial oxamic acid (15.8 mM) was transformed to carbonate ion and nitrogen at Pt/CNT modified anode.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 7