Photocatalytic oxidation of gaseous DMF using thin film TiO2 photocatalyst

The heterogeneous photocatalytic oxidation of gaseous N,N'-dimethylformamide (DMF) widely used in the manufacture of synthetic leather and synthetic textile was investigated. The experiments were carried out in a plug flow annular photoreactor coated with Degussa P-25 TiO2. The oxidation rate w...

Full description

Saved in:
Bibliographic Details
Published in:Chemosphere (Oxford) 2005-02, Vol.58 (8), p.1071-1078
Main Authors: CHANG, Chiu-Ping, CHEN, Jong-Nan, LU, Ming-Chun, YANG, He-Yuan
Format: Article
Language:English
Subjects:
Air Pollution, Indoor - prevention & control
Applied sciences
Atmospheric pollution
Catalysis
Coloring Agents - chemistry
Combustion and energy production
Dimethylformamide - chemistry
Exact sciences and technology
Oxidation-Reduction
Photochemistry
Pollution
Prevention and purification methods
Textile Industry
Titanium - chemistry
Ultraviolet Rays
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:The heterogeneous photocatalytic oxidation of gaseous N,N'-dimethylformamide (DMF) widely used in the manufacture of synthetic leather and synthetic textile was investigated. The experiments were carried out in a plug flow annular photoreactor coated with Degussa P-25 TiO2. The oxidation rate was dependent on DMF concentration, reaction temperature, water vapor, and oxygen content. Photocatalytic deactivation was observed in these reactions. The Levenspiel deactivation kinetic model was used to describe the decay of catalyst activity. Fourier transform infrared (FTIR) was used to characterize the surface and the deactivation mechanism of the photocatalyst. Results revealed that carbonylic acids, aldehydes, amines, carbonate and nitrate were adsorbed on the TiO2 surface during the photocatalytic reaction. The ions, NH4+ and NO3-, causing the deactivation of catalysts were detected on the TiO2 surface. Several treatment processes were applied to find a suitable procedure for the regeneration of catalytic activity. Among these procedures, the best one was found to be the H2O2/UV process.
ISSN:0045-6535
1879-1298
DOI:10.1016/j.chemosphere.2004.09.072