Photocatalytic nitrate reduction over Pd-Cu/TiO2

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

Autores

Olívia Soares (Autor) FEUP; Fernando Pereira (Autor) FEUP; José Órfão (Autor) FEUP; Joaquim Luís Faria (Autor) FEUP; Cláudia Silva (Autor) FEUP

Revista

Título: Chemical Engineering Journal

Vol. 251

Páginas: 123-130

ISSN: 1385-8947

Editora: Elsevier

Indexação

ISI Web of Knowledge - 42 Citações

ISI Web of Science

Scopus - 58 Citações

Classificação Científica

CORDIS: Ciências Físicas > Química

FOS: Ciências da engenharia e tecnologias > Engenharia química

Projetos Associados

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

Outras Informações

ID Authenticus: P-009-CWA

DOI: 10.1016/j.cej.2014.04.030

Abstract (EN): The extension of photocatalytic nitrate reduction in water by a 1%Pd-1%Cu (%wt) catalyst supported on TiO2 was evaluated under different reaction conditions. A series of electron sacrificial donors such as formic acid, oxalic acid, ethanol, methanol, and humic acid were used for inhibiting the mechanism of electron/hole recombination on the semiconductor by hole scavenging. In addition, the roles of H-2 as reducing agent and CO2 as buffer are also discussed. The photocatalytic process is found to be more selective towards nitrogen than the dark catalytic process. Hole scavengers, or reducing H-2 increase significantly the photocatalytic reduction of nitrate. Complete (100%) conversion was obtained when both H-2 and CO2 were used as reducing and buffer agent, respectively. Among the hole scavengers tested, 0.08 M formic acid solution represents the best compromise between nitrate conversion (84%) and nitrogen selectivity (83%).

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 8