title: Central composite design optimization of pilot plant fluidized-bed heterogeneous Fenton process for degradation of an azo dye.
abstract: Optimization of Acid Yellow 36 (AY36) degradation by heterogeneous Fenton process in a recirculated fluidized-bed reactor was studied using central composite design (CCD). Natural pyrite was applied as the catalyst characterized by X-ray diffraction and scanning electron microscopy. The CCD model was developed for the estimation of degradation efficiency as a function of independent operational parameters including hydrogen peroxide concentration (0.5-2.5 mmol/L), initial AY36 concentration (5-25 mg/L), pH (3-9) and catalyst dosage (0.4-1.2 mg/L). The obtained data from the model are in good agreement with the experimental data (R(2 )= 0.964). Moreover, this model is applicable not only to determine the optimized experimental conditions for maximum AY36 degradation, but also to find individual and interactive effects of the mentioned parameters. Finally, gas chromatography-mass spectroscopy (GC-MS) was utilized for the identification of some degradation intermediates and a plausible degradation pathway was proposed.
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: Rasoul
authors.initials: R
authors.lastname: Bagheri
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 Nanotechnology , Near East University , Nicosia , North Cyprus , Turkey.
authors.forename: Alireza
authors.initials: A
authors.lastname: Khataee
mesh_terms: D001391:Azo Compounds / Q000032:analysis / Q000737:chemistry*; D004396:Coloring Agents / Q000032:analysis / Q000737:chemistry*; D004867:Equipment Design; D007501:Iron / Q000737:chemistry; D012107:Research Design; D013440:Sulfides / Q000737:chemistry; D013784:Textiles; D014865:Waste Disposal, Fluid / Q000379:methods*; D062065:Wastewater / Q000737:chemistry; D018508:Water Purification / Q000379:methods*
chemical_list: D001391:Azo Compounds; D004396:Coloring Agents; D007501:Iron; D013440:Sulfides; D062065:Wastewater; C011342:pyrite; C005108:metanil yellow
keywords: Azo dye; Fluidized-bed reactor; central composite design; heterogeneous Fenton; natural pyrite