Influence of operational key parameters on the photocatalytic decolorization of Rhodamine B dye using Fe2+/H 2O 2/Nb 2O 5/UV system

Hashemzadeh, Fatemeh; Rahimi, Rahmatollah; Gaffarinejad, Ali

Influence of operational key parameters on the photocatalytic decolorization of Rhodamine B dye using Fe2+/H 2O 2/Nb 2O 5/UV system

2014

Hashemzadeh, Fatemeh | Rahimi, Rahmatollah | Gaffarinejad, Ali

The present research deals with the development of a new heterogeneous photocatalysis and Fenton hybrid system for the removal of color from textile dyeing wastewater as Rhodamine B (RhB) solutions by using Fe²⁺/H₂O₂/Nb₂O₅as a photocatalytic system. The application of this photocatalytic system for the decolorization of dye contaminants is not reported in the literature yet. Different parameters like dye concentration, Nb₂O₅/Fe²⁺catalyst amount, pH, and H₂O₂concentration have been studied. The optimum conditions for the decolorization of the dye were initial concentration of 10 mg L⁻¹of dye, pH 4, and Nb₂O₅/Fe²⁺catalyst concentration of 0.5 g L⁻¹/50 mg L⁻¹. The optimum value of H₂O₂concentration for the conditions used in this study was 700 mg L⁻¹. Moreover, the efficiency of the Nb₂O₅/photo-Fenton hybrid process in comparison to photo-Fenton alone and a dark Fenton process as a control experiment to decolorize the RhB solution has been investigated. The combination of photo-Fenton and Nb₂O₅catalysts has been proved to be the most effective for the treatment of such type of wastewaters. The results revealed that the RhB dye was decolorized in a higher percent (78 %) by the Nb₂O₅/photo-Fenton hybrid process (Fe²⁺/H₂O₂/Nb₂O₅/UV) than by the photo-Fenton process alone (37 %) and dark Fenton process (14 %) after 120 min of treatment. Moreover, the Nb₂O₅catalyst as a heterogeneous part of the photocatalytic system was demonstrated to have good stability and reusability.

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