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Heterogeneous Fenton catalyst Fe2(MoO4)3 was prepared and the process   efficiency was evaluated for oxidation of water-based Cyan flexo dye in   synthetic aqueous solution and printing wastewater. The removal process of   printing dye was analyzed by UV/VIS spectrophotometry, while dye   mineralization was evaluated by the determination of total organic carbon   content and chemical oxygen demand. Four determinants of the heterogeneous   Fenton system, including initial dye concentration, iron concentration, pH   and hydrogen peroxide concentration were investigated. Statistical method,   definitive screening design was applied to generate optimal operational   conditions of the four variables, which maximizes the process of dye   removal. The initial dye concentration of 20 mgL-1, catalyst dosage of 0.75   mgL-1, pH of 2 and H2O2 concentration of 11 mM were chosen as the best   operational conditions, contributing to 82% of the process efficiency. The   Fenton process efficiency of 79% was achieved within the treatment of   printing wastewater under optimal conditions for a 90 minute reaction time.   The maximum COD removal efficiency was 61.1%, while 67% mineralization was   achieved. The obtained results confirmed synergistic effect of Fe3+ and MoO4   2? which contributed to high catalytic activity and high heterogeneous   Fenton efficiency.

Oxidative degradation of cyan flexo dye with Heterogeneous Fenton reagent - Fe2(MoO4)3 particle