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

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 N2 adsorption–desorption isotherm, TG, diffuse reflectance UV–vis spectroscopy, XRD and SEM. The photocatalytic activity wa...

Full description

Saved in:
Bibliographic Details
Published in:Applied catalysis. B, Environmental Environmental, 2007-01, Vol.70 (1-4), p.470-478
Main Authors: Wang, Wendong, Silva, Cláudia Gomes, Faria, Joaquim Luís
Format: Article
Language:English
Subjects:
Activated carbon
Composite catalyst
Photocatalysis
Titanium dioxide
UV photodegradation
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary: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 N2 adsorption–desorption isotherm, TG, diffuse reflectance UV–vis spectroscopy, XRD and SEM. The photocatalytic activity was tested on the degradation of Chromotrope 2R (C2R) 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.
ISSN:0926-3373
1873-3883
DOI:10.1016/j.apcatb.2005.11.034