Application of Photo-Fenton System (UV/ H2O2/ Fe2+) for Efficient Decolorization of Azo-Dye Acid Yellow 17 in Aqueous Solution

Herein we report, the robustness of UV/H2O2/Fe2+ system for efficient decolorization of azodye Acid Yellow (AY17) solution. It has been found that 88% AY17 decolorized by UV/H2O2/Fe^2+ system in 25 minutes under the following optimized conditions; [dye] = 0.14 mM, [H2O2] =1.0 mM, [Fe2+ ] = 0.09 mM, stirring velocity =100 rpm, and pH = 3.0. The decolorization of AY17 by UV/H2O2/Fe2+ system exhibits secondorder reaction kinetics. Thermodynamic parameters, activation enthalpy, rH*, (13.76 kJ/mol^1), and entropy ΔS*, (0.034686 J/K) of the dye decolorization were also determined. It was ascertained that electrolytes such as HCO3^−, CO3^2−, Cl^−, and SO4^2− decrease the decolorization efficiency by scavenging the hydroxyl radical generation in the dye solution. Finally, the AY17 decolorization in the tape water sample by UV/H2O2/Fe^2+ system was also examined.