Articles producció científica> Enginyeria Química

Chromium(VI) reduction in aqueous medium by means of catalytic membrane reactors

  • Datos identificativos

    Identificador: PC:1436
  • Autores:

    A. Dafinov
    V. Pinos
    F. Medina
    J. Sueiras
  • Otros:

    Autor según el artículo: A. Dafinov; V. Pinos; F. Medina; J. Sueiras
    Departamento: Enginyeria Química
    Palabras clave: Chromate reduction Catalytic membrane reactor Pd and Pd/CeO2/Fe2O3 active phases
    Resumen: A novel method for catalytic reduction of chromium(VI) to chromium(III) in model and real water is proposed in this work. Hydrogen was used as a reducer. Three different catalytic membrane reactors were prepared and employed in the studied reaction. The catalytic membrane reactors were prepared using commercial corundum hollow fiber membranes. The active phases, palladium, cerium oxide, iron oxide or combinations of them, were incorporated by incipient wetness impregnation of the corresponding water-soluble salts followed by calcination and reduction. The catalytic tests were performed in semi-batch mode at ambient conditions. A mass flow controller was used to supply hydrogen to one end of the membrane whilst the other end was kept closed. The reactors were submerged into a vessel containing the chromate solution. The concentration of the chromate was continuously monitored following a standard analytical method. The initial chromate concentration was varied between 0.5 and 18 mg L-1. In order to completely reduce the Cr(VI) to Cr(III), it was necessary to decrease the pH of the solution to 3. In the end of the tests the final solutions were neutralized to pH 8 and filtered. The content of chromium in the final solutions and in the precipitates was determined by inductively coupled plasma (ICP) technique. It was demonstrated that for the studied reaction the presence of palladium is essential. In all experiments, with synthetic and real water adjusted to pH 3, the catalytic membrane reactors containing palladium (0.3-0.9 w/w%) effectively reduced the chromium to levels below 0.03 mg L-1 without losing activity in repetitive runs. The results from ICP analyses demonstrated that the chromium can be completely eliminated from the water after neutralization and filtration.
    Grupo de investigación: Catàlisi heterogènia
    Áreas temáticas: Enginyeria química Ingeniería química Chemical engineering
    Acceso a la licencia de uso:
    ISSN: 2213-3437
    Identificador del autor: n/a; n/a; 0000-0002-3111-1542*; 0000-0002-4059-0506
    Fecha de alta del registro: 2016-04-13
    Página final: 1889
    Volumen de revista: 4
    Versión del articulo depositado: info:eu-repo/semantics/acceptedVersion
    Enlace a la fuente original:
    DOI del artículo: 10.1016/j.jece.2016.03.008
    Entidad: Universitat Rovira i Virgili
    Año de publicación de la revista: 2016
    Página inicial: 1880
    Tipo de publicación: Article Artículo Article
  • Palabras clave:

    Reactors de membrana
    Chromate reduction
    Catalytic membrane reactor
    Pd and Pd/CeO2/Fe2O3 active phases
    Enginyeria química
    Ingeniería química
    Chemical engineering
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