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

Abstract

Herein we report, the robustness of UV/H2O2/Fe2+ system for efficient decolorization of azo-dye Acid Yellow (AY17) solution. It has been found that 88% AY17 decolorized by UV/H2O2/Fe2+ 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 second-order reaction kinetics. Thermodynamic parameters, activation enthalpy, rH*, (13.76 kJ/mol1), and entropy rS*, (0.034686 J/K) of the dye decolorization were also determined. It was ascertained that electrolytes such as HCO3−, CO32−, Cl−, and SO42− 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/Fe2+ system was also examined.

Keywords

• azo dye
• oxidative degradation
• uv/h2o2/fe2+
• optimum conditions
• second-order kinetics