Photocatalytic degradation of Chromotrope 2R using nanocrystalline TiO2/activated-carbon composite catalysts

• Tipo: Artigo em Revista Científica Internacional
• Data: 2007

Autores

W. Wang (Autor) FEUP; Cláudia G. Silva (Autor) FEUP; Joaquim L. Faria (Autor) FEUP

Revista

Título: Applied Catalysis B: Environmental

Vol. 70

Páginas: 470-478

ISSN: 0926-3373

Editora: Elsevier

Indexação

ISI Proceedings

ISI Web of Knowledge - 132 Citações

ISI Web of Science

Scopus - 142 Citações

Classificação Científica

FOS: Ciências da engenharia e tecnologias > Engenharia química

Outras Informações

ID Authenticus: P-004-C6J

DOI: 10.1016/j.apcatb.2005.11.034

Abstract (EN): Composite catalysts made of nanocrystalline TiO2 and carbon were prepared by a modified sol-gel method over activated carbon (AC). The composite catalysts were characterized by N-2 adsorption-desorption isotherm, TG, diffuse reflectance UV-vis spectroscopy, XRD and SEM. The photocatalytic activity was tested on the degradation of Chromotrope 2R (M) in aqueous medium under UV radiation. The composite catalysts exhibited higher activities than commercial Degussa P25 alone and the photocatalytic process was more efficient than the pure photolytic degradation. A modified Langmuir-Hinshelwood approach was used to study the kinetics and to determine the adsorption equilibrium constant and the reaction rate constant. Two different mechanisms are proposed and discussed in order to explain the observed synergy. (c) 2006 Published by Elsevier B.V.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 9