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Dye-effect in TiO2 catalyzed contaminant photo-degradation: Sensitization vs. charge-transfer formalism

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Sat, 2013-06-01 13:31 — Amer M EL-Hamouz
Journal Title, Volume, Page: 
Solid State Sciencesو Volume 9, Issue 1, Pages 9–15
Year of Publication: 
2007
Link: 
http://www.sciencedirect.com/science/article/pii/S1293255806002391
Authors: 
H.S. Hilal
Department of Chemistry, An-Najah N. University, PO Box 7, University Street, Nablus, West Bank, Palestine
L.Z. Majjad
Department of Chemistry, An-Najah N. University, PO Box 7, University Street, Nablus, West Bank, Palestine
N. Zaatar
Department of Chemistry, An-Najah N. University, PO Box 7, University Street, Nablus, West Bank, Palestine
A. El-Hamouz
Department of Chemical Engineering, An-Najah N. University, PO Box 7, University Street, Nablus, West Bank, Palestine
Current Affiliation: 
Department of Chemical Engineering, An-Najah National University, Nablus, Palestine
[email protected]
Preferred Abstract (Original): 
Anatase TiO2 surfaces have been treated with 2,4,6-triphenylpyrilium hydrogen sulfate (TPPHS) dye to yield the modified TiO2/TPPHS surface. The modified TiO2/TPPHS surface was then supported onto activated carbon (AC) surfaces to yield a new class of catalytic system AC/TiO2/TPPHS. The catalytic activities of naked TiO2, TPPHS solution, TiO2/TPPHS and AC/TiO2/TPPHS systems were examined in photo-degradation of phenol and benzoic acid in water, using both UV and visible regions. All studied systems showed low catalytic activity when used in the visible region. In UV, the AC/TiO2/TPPHS showed highest activity, whereas the naked TiO2 and TPPHS solutions were the least active systems. The dye role, in enhancing activity of modified surfaces in UV degradation of contaminants, is understandable by a charge-transfer catalytic effect rather than a sensitizing effect. AC role is explainable by its ability to adsorb contaminant molecules and bringing them closer to catalytic sites.

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