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

Document Type: Research Article

Authors

1 National Centre of Excellence in Physical Chemistry, University of Peshawar- 25120. PAKISTAN

2 National Centre of Excellence in Physical Chemistry, University of Peshawar- 25120. Pakistan

3 Department of Chemistry, Hazara University, y Mansehra-21120. PAKISTAN,

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 exhibit second order reaction kinetics. Thermodynamic parameters, activation enthalpy, H*, (13.76 kJ.mol-1) and entropy S*, (0.034686 J.K-1) 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.

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