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- Tuesday, January 5, 2010
- Pristine and supported ZnO-based catalysts for phenazopyridine degradation with direct solar light
- Published at:Solid State Sciences 12 (2010) 578-586
Hikmat S. Hilal,
Ghazi Y.M. Al-Nour, Ahed Zyoud, Muath H. Helal, Iyad Saadeddin
Abstract:
In search for safe techniques to manage waste pharmaceutical compounds drained in water, solar-driven
degradation of phenazopyridine (a model drug) was investigated in aqueous media using different ZnObased
catalyst systems. Naked ZnO, CdS-sensitized ZnO (ZnO/CdS) and activated carbon-supported ZnO
(AC/ZnO) have been studied. Both naked ZnO and AC/ZnO were highly efficient in mineralizing phenazopyridine,
reaching complete removal in
50 min, with AC/ZnO having the higher edge. The ZnO/CdS
system showed lower efficiency, due to screening of light by CdS. Moreover, the tendency of CdS to leach
out Cd
ions discouraged the use of CdS as sensitizer in this work. In both ZnO and AC/ZnO systems, the
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