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In this study, the efficiency of EC/UV/TiO2 and EC/UV/ZnO coupled systems, on the decolorization of C.I. Acid Yellow 23 (AY23) as a model contaminant was compared. It was found that for the efficient decolorization of 40 mg L-1 of AY23 using steel304/Al (anode/cathode) as electrodes, with the distance of 15 mm, I = 120 A m-2, electrolyte concentration was 800 mg L-1 for both systems, but pH and initial concentrations of catalysts were 5.53, 800 mg L-1 for TiO2 and 6.29, 650 mg L-1 for ZnO systems, respectively. Th...

The decolorization of Acid Yellow 42 (AY42) by Fenton and electro-Fenton processes was compared. The effect of operational parameters was studied and the desired conditions obtained in the initial dye concentration of 120 mg L-1 for H2O2/ Fe2+ ([H2O2]=800 mg L-1, [Fe2+]=0.2 mmol, pH=3) and electrolysis/Fe2+/H2O2 ([H2O2]=1100 mg L-1 , [Fe2+]= 0.5 mmol, pH=3.5 and distance of electrodes 10 mm) systems. The Fenton process proved to be more efficient and occurs at a higher oxidation rate than electro-Fenton process an...

The photodegradation of Acid Yellow 23 a model compound from monoazo textile dyes was investigated using TiO2, SnO2 and TiO2+SnO2 suspension as photocatalysts at different gap sizes. The results showed that the coupled particles were not much different from single TiO2 system at the gap size of 4.5 cm in a batch reactor. But the coupled system was more effective when the gap size was reduced to 2.5 cm. A complete decolorization occurs at the gap size of 1.1 cm after 20 min of irradiation while 90\% decolorization ...