Azo-dye orange II degradation by the heterogeneous Fenton-like process using a zeolite Y-Fe catalyst—Kinetics with a model based on the Fermi's equation

• Published in: Applied catalysis. B, Environmental Environmental, 2014-03, Vol.146, p.192-200
• Main Authors: Rache, Maryin L., García, Andrés R., Zea, Hugo R., Silva, Adrián M.T., Madeira, Luis M., Ramírez, Jose H.
• Format: Article
• Language: English
• Subjects: Adjustable; Catalysis; Catalysts; Chemistry; Degradation; Exact sciences and technology; Fenton-like; Fermi's equation; Fittings; General and physical chemistry; Ion-exchange; Kinetic study; Mathematical analysis; Mathematical models; Orange II; Surface physical chemistry; Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry; Zeolite; Zeolites; Zeolites: preparations and properties
• ISSN: 0926-3373; 1873-3883
• DOI: 10.1016/j.apcatb.2013.04.028

•Iron-containing Na-Y zeolite catalyst was prepared by ion exchange.•Catalyst is active and stable for heterogeneous Fenton-like degradation of OII.•pH and particularly reaction temperature affect considerably oxidation performance.•OII degradation follows Fermi's equation with remarkable adherence of the model. The degradation of Orange II dye (OII) by a heterogeneous Fenton-like process was studied using a catalyst with 5wt.% of iron after ion-exchange in a Na–Y zeolite support. The catalyst was characterized by X-ray diffraction (XRD), N2 adsorption, atomic absorption spectroscopy and X-ray fluorescence (XRF). The effect of the initial concentrations of H2O2 and OII, pH and temperature on the degradation rate of OII was investigated by carrying out experiments in a batch reactor. The OII concentration histories (i.e., concentration evolution along reaction time) were described by a simple semi-empirical kinetic model, based on the Fermi's equation, which captures simultaneously the influence of all the reaction conditions with a few adjustable parameters. The adherence of the model to the data was remarkable, and the effect of the operating conditions on the obtained fitting parameters – apparent rate constant and transition time – was analyzed.