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 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.
Chang
Chiu-Ping
CP
Institute of Environmental Engineering, National Chiao Tung University, Hsinchu 300, Taiwan.
Chen
Jong-Nan
JN
Lu
Ming-Chun
MC
Yang
He-Yuan
HY
D016902:Air Pollution, Indoor / Q000517:prevention & control*; D002384:Catalysis; D004396:Coloring Agents / Q000737:chemistry*; D004126:Dimethylformamide / Q000737:chemistry*; D010084:Oxidation-Reduction; D010777:Photochemistry; D013783:Textile Industry; D014025:Titanium / Q000737:chemistry*; D014466:Ultraviolet Rays
D004396:Coloring Agents; C009495:titanium dioxide; D004126:Dimethylformamide; D014025:Titanium