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

• Type: Article in International Scientific Journal
• Date: 2007

Authors

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

Journal

Title: Applied Catalysis B: Environmental

Vol. 70

Pages: 470-478

ISSN: 0926-3373

Publisher: Elsevier

Indexing

ISI Proceedings

ISI Web of Knowledge - 132 Citations

ISI Web of Science

Scopus - 142 Citations

Scientific classification

FOS: Engineering and technology > Chemical engineering

Other information

Authenticus ID: 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.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 9