title: Semi-empirical chemical model for indirect advanced oxidation of Acid Orange 7 using an unmodified carbon fabric cathode for H2O2 production in an electrochemical reactor.
abstract: A commercial Unidirectional Carbon Fabric piece was used to design an electrode for the cathodic O2 reduction reaction in a divided (by a Nafion(®) 117 membrane) parallel plate reactor. The anode was a commercial stainless steel mesh. Under this approach it is feasible to produce H2O2 at low energy (2.08 kWh kg(-1) H2O2) in low ionic acidic medium. In the catholyte side the H2O2 can be activated with Fe(2+) to develop the Fenton reagent. It was found that Acid Orange 7 (AO7) indirect oxidation (in the concentration range of 0.12-0.24 mM) by Fenton chemistry follows a first order kinetic equation. The energy required for 0.24 mM AO7 degradation is 1.04 kWhm(-3). From each experimental AO7 oxidation the main parameters (a, mM and k, min(-1)) of the first order kinetic equation are obtained. These parameters can be correlated with AO7 concentration in the concentration range studied. Based on this method a semi-empirical chemical model was developed to predict the AO7 abatement, by means of Fenton chemistry. Good AO7 oxidation predictions can be made in the concentration range studied. A detailed discussion of the energy required for oxidizing AO7 and the accuracy of the chemical model to predict its oxidation is included in this paper.
authors.affiliation: Posgrado en Ingeniería y Ciencias Aplicadas FCQeI-CIICAp, UAEM, Morelos, Mexico.
authors.forename: B
authors.initials: B
authors.lastname: Ramírez
authors.affiliation: Posgrado en Ingeniería y Ciencias Aplicadas FCQeI-CIICAp, UAEM, Morelos, Mexico.
authors.forename: V
authors.initials: V
authors.lastname: Rondán
authors.affiliation: Centro de Investigación en Biotecnología, UAEM, Av. Universidad 1001, Cuernavaca, Morelos, 62209, Mexico.
authors.forename: L
authors.initials: L
authors.lastname: Ortiz-Hernández
authors.affiliation: Centro de Investigación en Ingeniería y Ciencias Aplicadas, UAEM, Av. Universidad 1001, Cuernavaca, Morelos, 62209, Mexico.
authors.forename: S
authors.initials: S
authors.lastname: Silva-Martínez
authors.affiliation: Centro de Investigación en Ingeniería y Ciencias Aplicadas, UAEM, Av. Universidad 1001, Cuernavaca, Morelos, 62209, Mexico. Electronic address: aalvarez@uaem.mx.
authors.forename: A
authors.initials: A
authors.lastname: Alvarez-Gallegos
mesh_terms: D001391:Azo Compounds / Q000737:chemistry*; D001557:Benzenesulfonates / Q000737:chemistry*; D002244:Carbon / Q000737:chemistry*; D055664:Electrochemical Techniques; D004566:Electrodes; D006861:Hydrogen Peroxide / Q000737:chemistry*; D007501:Iron / Q000737:chemistry; D007700:Kinetics; D008956:Models, Chemical; D010084:Oxidation-Reduction; D013784:Textiles; D014874:Water Pollutants, Chemical / Q000737:chemistry*; D018508:Water Purification / Q000379:methods
chemical_list: D001391:Azo Compounds; D001557:Benzenesulfonates; D014874:Water Pollutants, Chemical; D002244:Carbon; D006861:Hydrogen Peroxide; D007501:Iron; C014722:2-naphthol orange
keywords: Acid Orange 7; Fenton chemistry; O(2) reduction; Parallel plate reactor; Unidirectional carbon fabric