title: In situ electrochemical and photo-electrochemical generation of the fenton reagent: a potentially important new water treatment technology.
abstract: In this work, the design and construction of an annular tube reactor for the electrochemical and photo-electrochemical in situ generation of H2O2 are described. By cathodic reduction of dissolved oxygen and the coupled oxidation of water at a UV-illuminated nanocrystalline-TiO2 semiconductor anode, it was found that the electrochemically generated H2O2 can be employed to readily oxidize the model compound Direct Yellow-52 in dilute acidic solution at high rates in the presence of small quantities of dissolved iron(II). Although, the model organic compound is chemically stable under UV radiation, its electrochemical oxidation rate increases substantially when the semiconductor anode is illuminated as compared to the same processes carried out in the dark.
authors.affiliation: Electrochemistry Department, Centro de Investigación y Desarrollo Tecnológico en Electroquímica, Parque Tecnológico Querétaro Sanfandila, Pedro Escobedo, 76700, Querétaro, México. lgodinez@cideteq.mx
authors.forename: J M
authors.initials: JM
authors.lastname: Peralta-Hernández
authors.forename: Yunny
authors.initials: Y
authors.lastname: Meas-Vong
authors.forename: Francisco J
authors.initials: FJ
authors.lastname: Rodríguez
authors.forename: Thomas W
authors.initials: TW
authors.lastname: Chapman
authors.forename: Manuel I
authors.initials: MI
authors.lastname: Maldonado
authors.forename: Luis A
authors.initials: LA
authors.lastname: Godínez
mesh_terms: D002244:Carbon / Q000032:analysis; D004563:Electrochemistry; D006861:Hydrogen Peroxide / Q000737:chemistry*; D007501:Iron / Q000737:chemistry*; D010084:Oxidation-Reduction / Q000528:radiation effects; D010777:Photochemistry; D014025:Titanium / Q000737:chemistry*; D014466:Ultraviolet Rays; D014874:Water Pollutants, Chemical / Q000032:analysis; D018508:Water Purification / Q000379:methods*; D014881:Water Supply
chemical_list: C045076:Fenton's reagent; D014874:Water Pollutants, Chemical; C009495:titanium dioxide; D002244:Carbon; D006861:Hydrogen Peroxide; D014025:Titanium; D007501:Iron