Background
Type: Article

Photocatalytic degradation of azo dyes catalyzed by Ag doped TiO2 photocatalyst

Journal: Journal of the Iranian Chemical Society (1735207X)Year: 2009/01/01Volume: Issue: 3
Mirkhani V.aTangestaninejad S.aMoghadam M.aHabibi M.H. Rostami Vartooni A.
DOI:10.1007/BF03246537Language: English

Abstract

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.


Author Keywords

Ag-TiO2Azo dyesPhotocatalystPhotodegradationTitanium dioxide