Résumé:
The aim of this work is study the degradation of a xanthene dye called "Erythrosine" (Er) in homogeneous and heterogeneous environments.
In a homogeneous medium, discoloration and degradation of Er was carried out by direct photolysis at 254 nm, solar and in the clouds. It was found that this dye was photolyzed more rapidly in sunlight.
In a heterogeneous medium, the experiments showed that the adsorption of Er on the TiO2 Degussa P25 in the absence of UV radiation was negligible. Discoloration and degradation by heterogeneous photocatalysis at 365 nm and in sunlight are significantly faster compared to direct photolysis under the same conditions.
Moreover, a kinetic study revealed that the fading process follows the model of Langmuir-Hinshelwood.
Thus the influence of some parameters such as: addition of H2O2, the initial concentration of pollutant and the catalyst were also studied.
Erythrosine processing by coupling between a photochemical process followed by powdered activated carbon adsorption showed that the levels of discoloration and degradation of Er improved.
