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Cds-Sensitized Tio2 In Phenazopyridine Photo-Degradation: Catalyst Efficiency, Stability And Feasibility Assessment

Hikmat S. Hilal's picture
Wed, 2011-03-09 11:47 — Hikmat S. Hilal, D.Sc.
Journal Title, Volume, Page: 
Journal of Hazardous Materials Volume 173, Issues 1-3,Pages 318-325
Year of Publication: 
2010
Link: 
http://www.sciencedirect.com/science/article/pii/S030438940901382X
Authors: 
Hikmat S. Hilal
Department of Chemistry, An-Najah N. University, PO Box 7, Nablus, West Bank, Palestine
Current Affiliation: 
Department of Chemistry, An-Najah N. University, PO Box 7, Nablus, West Bank, Palestine
[email protected]
Ahed H. Zyoud
Department of Chemistry, An-Najah N. University, PO Box 7, Nablus, West Bank, Palestine
[email protected]
Nidal Zaatar
Department of Chemistry, An-Najah N. University, PO Box 7, Nablus, West Bank, Palestine
Cheknane Ali
Laboratoire d’Etude et Développement des matériaux Diélectriques et Semiconducteurs, Université Amar Telidji de Laghouat, Laghouat, Algeria
Iyad Saadeddin
Department of Chemistry, An-Najah N. University, PO Box 7, Nablus, West Bank, Palestine
DaeHoon park
Institut de Chimie de la Matière Condensée de Bordeaux (ICMCB), 87 Avenue du Dr. A Schweitzer, 33608 Pessac, France
Guy Campet
Institut de Chimie de la Matière Condensée de Bordeaux (ICMCB), 87 Avenue du Dr. A Schweitzer, 33608 Pessac, France
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.