Silica-Supported Cds-Sensitized Tio2 Particles in Photo-Degradation of Phenazopyridine: Assessment of Efficiency, Stability and Recovery

Hikmat S. Hilal's picture
Journal Title, Volume, Page: 
IWAM, RAK-CAM, Ras Al-Khayma Center for Advanced materials
Year of Publication: 
2010
Authors: 
Hikmat S. Hilal
Department Of Chemistry, An-Najah N. University, Nablus, PO Box 7, West Bank, Palestine
Current Affiliation: 
Department Of Chemistry, An-Najah N. University, Nablus, PO Box 7, West Bank, Palestine
Ghazi Nour
Ahed Zyoud
Preferred Abstract (Original): 
Mineralization of phenazopyridine, 1, in water, under solar-simulator radiation was efficiently achieved using nanoparticle CdS-sensitized rutile TiO2 , TiO2 /CdS,  2,  as  photo-catalysts. Despite that, 2  showed two main drawbacks. Firstly, the system was difficult to recover by  simple filtration, and demanded centrifugation. Secondly, the sensitizer CdS showed relatively high tendency to leach out hazardous Cd2+ ions under photo-degradation reaction conditions. In  an attempt to solve out such difficulties, 2  was supported onto sand surface. The  sand/TiO2 /CdS  system, 3, was easier to recover but showed slightly lower catalytic activity compared to 2. On the other hand, the support failed to prevent leaching of Cd2+ . This  indicates limited future applicability of CdS-sensitized TiO2  photo-catalyst systems, in solar-based water purification strategies, unless leaching out tendency is completely prevented.
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Silica-Supported Cds-Sensitized Tio2 Particles in Photo-Degradation of Phenazopyridine: Assessment of Efficiency, Stability and Recovery1.3 MB