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The photocatalytic degradation of aqueous solutions of Acid Orange 7 in TiO2 suspensions has been investigated with the use of a solar light simulating source. It has been found that, when the fullrange of emitted photons is used, decolorization and complete mineralization of the solution is achievedwith satisfactory rates, depending on initial dye concentration. A reaction pathway is proposed accordingto which degradation of the dye molecules adsorbed on the photocatalyst surface takes place via a series ofoxidation steps, which lead to decolorization and formation of a number of intermediates, mainly aromaticand aliphatic acids, which are further oxidized toward compounds of progressively lower molecular weight.Eventually, mineralization is achieved leading to the formation of gas phase CO2 and inorganic ions in solution.Kinetic results show that the initial rate of decolorization depends strongly on surface coverage and onincident photon energy. Visible light photons contribute to decolorization, via the photosensitization mechanism,but with reaction rates which are more than two orders of magnitude lower than the correspondingones induced by photons of energy higher than that of the band gap of the semiconductor. In both cases,the initial rate of decolorization is significantly reduced for dye coverages close to monolayer

international journal of photoenergy

Mechanistic and kinetic study of solar-light induced photocatalytic degradation of Acid Orange 7 in aqueous<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" alttext="${\text{TiO}}_{\text{2}} $"><mml:mrow><mml:msub><mml:mrow><mml:mtext>TiO</mml:mtext></mml:mrow><mml:mtext>2</mml:mtext></mml:msub></mml:mrow></mml:math>suspensions

Mechanistic and kinetic study of solar-light induced photocatalytic degradation of Acid Orange 7 in aqueousTiO2suspensions