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Chemical Papers

, Volume 65, Issue 3, pp 289–298 | Cite as

Photocatalytically-assisted electrochemical degradation of p-aminophenol in aqueous solutions using zeolite-supported TiO2 catalyst

  • Cornelia RatiuEmail author
  • Florica Manea
  • Carmen Lazau
  • Corina Orha
  • Georgeta Burtica
  • Ioan Grozescu
  • Joop Schoonman
Original Paper

Abstract

This paper reports the results of an investigation into enhancement of the electrochemical oxidation of p-aminophenol (4-AP) in an aqueous solution with a boron-doped diamond (BDD) electrode, assisted by photocatalysis using a zeolite-supported TiO2 (Z-TiO2) catalyst. The BDD electrode was characterised in 0.1 M Na2SO4-supporting electrolyte and the presence of 4-AP by open-circuit potential behaviour (OCP) and cyclic voltammetry (CV). The electrode behaviour was investigated in the dark and following UV irradiation and in the absence/presence of the Z-TiO2 catalyst. The electro-oxidation process was carried out using chronoamperometry (CA) and multiple-pulsed amperometry (MPA) at the selected potential under potentiostatic conditions. The electrochemical degradation process of 4-AP on the BDD electrode was improved by the application of a pulsed potential, which allowed both in-situ electrochemical cleaning of the electrode and indirect oxidation of 4-AP by oxygen evolution. The application of photocatalysis using Z-TiO2 in the 4-AP electrochemical degradation exhibited an enhanced effect when the anodic potential was set at +1.25 V vs. Ag/AgCl in the water stability region, close to the oxygen evolution potential.

Keywords

p-aminophenol removal electrochemical oxidation photocatalytically-assisted electrochemical oxidation zeolite-supported TiO2 

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Copyright information

© Institute of Chemistry, Slovak Academy of Sciences 2011

Authors and Affiliations

  • Cornelia Ratiu
    • 1
    • 2
    Email author
  • Florica Manea
    • 2
  • Carmen Lazau
    • 1
  • Corina Orha
    • 1
  • Georgeta Burtica
    • 2
  • Ioan Grozescu
    • 1
  • Joop Schoonman
    • 3
  1. 1.Department of Condensed MatterNational Institute of Research-Development for Electrochemistry and Condensed Matter TimisoaraTimisoaraRomania
  2. 2.Department of Applied Chemistry and Engineering of Inorganic Compounds and Environment“Politehnica” University of TimisoaraTimisoaraRomania
  3. 3.Department DelftChemTech, Faculty of Applied ScienceDelft University of TechnologyDelftThe Netherlands

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