Abstract
The photodestruction of Acid Orange 7 (AO7), an anionic acidic dye, was studied in the UV/H 2O 2 process. H 2O 2 and UV light have a negligible effect when they were used on their own. Removal efficiency of AO7 was sensitive to the operational parameters such as initial H 2O 2 concentration, initial AO7 concentration, pH and different light sources. The photodestruction of AO7 was inhibited by addition of EtOH as an electron scavenger. The semi-logarithmic graphs of the concentration of AO7 versus time (t<30 min) were linear, suggesting pseudo-first order reactions (k optimum =0.105 min −1) . A simple kinetic model is proposed which is in agreement with experimental results.
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