engleski

Azo dye degradation using Fenton type processes assisted by UV irradiation: a kinetic study

Application of Fenton and photo-Fenton type processes, UV/Fe2+/H2O2 and UV/Fe0/H2O2, for dye wastewater treatment was investigated. In the first stage of the study, Fenton type processes were optimized regarding to the iron catalyst concentration and the iron catalyst/H2O2 ratio, while in the next step Fe2+/H2O2 and Fe0/H2O2 at optimal process parameters were combined with UV radiation in order to enhance dye degradation. Destruction of model organic pollutant, azo dye C.I. Acid Orange 7 (AO7), was monitored on the basis of decolorization and mineralization extents, determined by UV/VIS and TOC analysis, respectively. All studied processes were shown to be very efficient in bleaching of the studied dye model solution with complete decolorization achieved in all cases. Mineralization extents were depended on the type and dosage of added iron catalysts for Fenton type reaction. The highest mineralization extent was achieved by UV/Fe0/H2O2, 90.09 % of TOC removal. On the basis of decolorization of AO7 by direct photolysis, a quantum yield of AO7 organic dye, Φ =6.5 10-3 mol Einstien-1, was determined.

azo dye; UV irradiation; AO7 quantum yield; Fenton type processes; dye degradation

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