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- Sunday, April 5, 2009
- PHOTO-DEGRADATION OF ORGANIC CONTAMINANTS BY
- Published at:Nano-Conference09
PHOTO-DEGRADATION OF ORGANIC CONTAMINANTS BY
DYES-SENSITIZED NANOPARTICALES OF TiO2 SUPPORTED ONTO INSOLUBLE SUPPORTS
Ahed Zyoud & Hikmat S. Hilal
Semi-conducting nano-materials are being used as catalysts for photo-degradation of water contaminants. In TiO2 photo-catalytic activity process, electron–hole pairs that are generated by the band-gap excitation carry out in situ degradation of toxic pollutants. The holes oxidize toxic organic compounds, and the electrons reduce toxic metal ions to metals, or oxygen to oxide.
TiO2 nanparticles were sensitized by dyes in order to activate the photo-degradation processes by the visible light. Thin films of TiO2 nanoparticales was supported, onto insoluble surfaces, such as sand and AC, from TiCl3. The resulting TiO2 nanoparticales are being modified with CdS (a short band-gab semiconductor) for sensitization purposes, Such model is explained in Scheme 1. producing [Sand/TiO2/CdS] system. Sand/TiO2/CdS system was being applied in degradation of methyl orange and Phenazopyridine. Results of our photo-degradation study, Kinetics, effect of temperature, effect of pH, Completely decomposition of CdS was found through treatment process.Instead of decomposed a toxic CdS dye a safe sensitize natural dyes were used. Both prepared (TiO2/Natural dye) systems show an efficient photodegradation result on both mentioned contaminants model. The prepared natural dye sensitized catalyst were supported on A. Also Kinetics, effect of temperature, effect of pH, and farther studies were applied on the prepared catalyst.
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Hikmat S. Hilal