title: Optimization of a textile dye degradation in a recirculating fluidized-bed reactor using magnetite/S2O82-process.
abstract: Optimization of Acid Orange 7 (AO7) treatment using heterogeneous Fenton-like method in a recirculating fluidized-bed reactor (FBR) was investigated by using central composite design (CCD). Natural magnetite (NM) as Fenton-like catalyst was characterized using scanning electron microscopy. A nonlinear CCD model was obtained for the prediction of dye degradation as a function of experimental variables such as peroxydisulfate concentration (0.1-0.5 mmol/L), initial AO7 concentration (5-25 mg/L), pH (3-9) and NM dosage (0.25-1.25 g/L) after 105 min of treatment. The calculated results by the model were consistent with the experimental results (R2= 0.959). Furthermore, the model is suitable to estimate the optimum operational conditions and determine the effects of the parameters for maximum AO7 degradation. Eventually, gas chromatography-mass spectroscopy was used for the recognition of the dye degradation by-products.
authors.affiliation: a Department of Chemical Engineering, Faculty of Chemical and Petroleum Engineering , University of Tabriz , Tabriz , Iran.
authors.forename: Hassan
authors.initials: H
authors.lastname: Aghdasinia
authors.affiliation: a Department of Chemical Engineering, Faculty of Chemical and Petroleum Engineering , University of Tabriz , Tabriz , Iran.
authors.forename: Parvin
authors.initials: P
authors.lastname: Arehjani
authors.affiliation: b Department of Chemical Engineering, Tabriz Branch , Islamic Azad University , Tabriz , Iran.
authors.forename: Behrouz
authors.initials: B
authors.lastname: Vahid
authors.affiliation: c Research Laboratory of Advanced Water and Wastewater Treatment Processes, Department of Applied Chemistry, Faculty of Chemistry , University of Tabriz , Tabriz , Iran.|d Department of Materials Science and Nanotechnology , Near East University , Mersin , Turkey.
authors.forename: Alireza
authors.initials: A
authors.lastname: Khataee
mesh_terms: D002384:Catalysis; D004396:Coloring Agents / Q000737:chemistry*; D052203:Ferrosoferric Oxide; D006861:Hydrogen Peroxide; D007220:Industrial Waste; D007501:Iron; D013783:Textile Industry
chemical_list: D004396:Coloring Agents; D007220:Industrial Waste; D006861:Hydrogen Peroxide; D007501:Iron; D052203:Ferrosoferric Oxide
keywords: Acid Orange 7; Heterogeneous Fenton-like; fluidized-bed reactor; natural magnetite; response surface methodology