J. Iran. Chem. Soc., Vol. 6, No. 3 September 2009, pp.578~587.

Current location: JICS Archive > Vol. 6 > No. 3 > Articles : 14

Photocatalytic Degradation of Azo Dyes Catalyzed by Ag Doped TiO2 Photocatalyst

V. Mirkhani*, S. Tangestaninejad, M. Moghadam, M.H. Habibi and A. Rostami-Vartooni

Department of Chemistry, Catalysis Division, University of Isfahan, Isfahan, 81746-73441, Iran

In this paper, photocatalytic degradation of commercial textile azo dyes catalyzed by titanium dioxide and modified titanium dioxide with Ag metal (1% w/w) in aqueous solution under irradiation with a 400 W high-pressure mercury lamp is reported. The effect of various parameters such as irradiation time of UV light, amount of photocatalyst, flow rate of oxygen, pH and temperature for the Ag-TiO2 photocatalyst were investigated. Kinetic investigations of photodegradation indicated that reactions obey improved Langmuir-Hinshelwood model and pseudo-first-order law. The rate constant studies of photocatalytic degradation reactions for Ag-TiO2 and TiO2 photocatalysts indicated that in all cases the rate constant of the reaction for Ag-TiO2 was higher than that of TiO2.

Keywords: Azo dyes, Titanium dioxide, Photodegradation, Photocatalyst, Ag-TiO2

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