title: Treatment of industrial effluents by electrochemical generation of H2O2 using an RVC cathode in a parallel plate reactor.
abstract: Electrochemical techniques have been used for the discolouration of synthetic textile industrial wastewater by Fenton's process using a parallel plate reactor with a reticulated vitreous carbon (RVC) cathode. It has been shown that RVC is capable of electro-generating and activating H2O2 in the presence of Fe(2+) added as catalyst and using a stainless steel mesh as anode material. A catholyte comprising 0.05 M Na2SO4, 0.001 M FeSO4.7H2O, 0.01 M H2SO4 and fed with oxygen was used to activate H2O2.The anolyte contained only 0.8 M H2SO4. The operating experimental conditions were 170 mA (2.0 V < ΔECell < 3.0 V) to generate 5.3 mM H2O2. Synthetic effluents containing various concentrations (millimolar - mM) of three different dyes, Blue Basic 9 (BB9), Reactive Black 5 (RB5) and Acid Orange 7 (AO7), were evaluated for discolouration using the electro-assisted Fenton reaction. Water discolouration was measured by UV-VIS absorbance reduction. Dye removal by electrolysis was a function of time: 90% discolouration of 0.08, 0.04 and 0.02 mM BB9 was obtained at 14, 10 and 6 min, respectively. In the same way, 90% discolouration of 0.063, 0.031 and 0.016 mM RB5 was achieved at 90, 60 and 30 min, respectively. Finally, 90% discolouration of 0.14, 0.07 and 0.035 mM AO7 was achieved at 70, 40 and 20 min, respectively. The experimental results confirmed the effectiveness of electro-assisted Fenton reaction as a strong oxidizing process in water discolouration and the ability of RVC cathode to electro-generate and activate H2O2 in situ.
authors.affiliation: a División de Estudios de Posgrado e Investigación - Ingeniería Ambiental . Instituto Tecnológico de Culiacán . Av. Juan de Dios Batiz 310. Col. Guadalupe, 80220 Culiacán , Sinaloa , México.
authors.forename: Yaneth A
authors.initials: YA
authors.lastname: Bustos
authors.affiliation: a División de Estudios de Posgrado e Investigación - Ingeniería Ambiental . Instituto Tecnológico de Culiacán . Av. Juan de Dios Batiz 310. Col. Guadalupe, 80220 Culiacán , Sinaloa , México.
authors.forename: Jesús Gabriel
authors.initials: JG
authors.lastname: Rangel-Peraza
authors.affiliation: b Universidad Nacional Autónoma de México, Instituto de Ingeniería, Coordinación de Ingeniería Ambiental , México , DF , Mexico.
authors.forename: Ma Neftalí
authors.initials: MN
authors.lastname: Rojas-Valencia
authors.affiliation: c Departamento de Ingeniería Química, Alimentos y Ambiental , Universidad de las Américas , Puebla. Sta. Catarina Mártir, Cholula , México.
authors.forename: Erick R
authors.initials: ER
authors.lastname: Bandala
authors.affiliation: d Centro de Investigación en Ingeniería y Ciencias Aplicadas (CIICAp), Universidad Autónoma del Estado de Morelos. Av. Universidad 1001. Col. Chamilpa 62209 , Cuernavaca , Morelos , México.
authors.forename: Alberto
authors.initials: A
authors.lastname: Álvarez-Gallegos
authors.affiliation: d Centro de Investigación en Ingeniería y Ciencias Aplicadas (CIICAp), Universidad Autónoma del Estado de Morelos. Av. Universidad 1001. Col. Chamilpa 62209 , Cuernavaca , Morelos , México.
authors.forename: Laura
authors.initials: L
authors.lastname: Vargas-Estrada
mesh_terms: D002244:Carbon / Q000737:chemistry*; D004396:Coloring Agents / Q000032:analysis / Q000737:chemistry*; D055664:Electrochemical Techniques / Q000295:instrumentation* / Q000379:methods; D004566:Electrodes; D006861:Hydrogen Peroxide / Q000138:chemical synthesis / Q000737:chemistry*; D062065:Wastewater / Q000737:chemistry*; D018508:Water Purification / Q000379:methods*
chemical_list: D002244:Carbon; D004396:Coloring Agents; D006861:Hydrogen Peroxide; D062065:Wastewater
keywords: Acid orange 7; Blue basic 9; Hydrogen peroxide production; reactive Black 5; reticulated vitreous carbon