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Enhancement of photodegradation of mordant dyes by iron powder and H2O2 in presence of UV light

M.Taha Elmorsi, Yasser M.Riyad, Zeinhom H.Mohamed, Sawsan A.Mahmoud, Hassan M.Abd El Bary

In this study different treatment methods such as H2O2/UV, Fenton and photo-Fenton (Fe+n/H2O2/UV) treatments, have been used to investigate the removal of theMordant red 7 (MR7) azo dye fromaqueous solution. In photo-Fenton treatment, iron (Fe) powder was used as a cheap source of Fe2+ ions. Complete decolorization ofMR7 usingH2O2/UVprocess, achieved in less than 60 min. The photodegradation process was mainly effected by different parameters such as initial dye concentrations, [H2O2], pH value and presence of different inorganic salts such as carbonate, nitrate and chloride ions. The decrease in the degradation percent was in the order of Carbonate > chloride > nitrate ions. In comparison, the photo-Fenton treatment, using Feï‚° powder as a source of Fe2+ ions, was more efficient in the decolorization ofMR7. It was found that complete decolorization ofMR 7 obtained in about 30 min. Furthermore,mineralization ofMR 7 was investigated using chemical oxygen demand (COD) experiment. The results indicated that, 66.67%of theMR7 dye wasmineralized usingH2O2/UVprocess in a 3.0 h photoperiod. While photo-Fenton treatment (in presence of Fe0 powder), wasmore efficient and resulted in completemineralization ofMR7 dye in about 2.0 h of photoperiod.