Aniline mineralization by AOP's: Anodic oxidation, photocatalysis, electro-Fenton and photoelectro-Fenton processes

Enric Brillas, Eva Mur, Roser Sauleda, Laura Sànchez, José Peral, Xavier Domènech, Juan Casado

Research output: Contribution to journalArticleResearchpeer-review

367 Citations (Scopus)

Abstract

The aniline degradation in acidic medium of pH≃3 under photocatalytic and electrochemical conditions has been investigated. The efficiency for substrate mineralization in each process has been comparatively analysed by the decrease in TOC of aniline solutions. Particular emphasis has been made on the role of Fe(II) ions and H2O2. The electrochemical experiments performed in the presence of both species (electro-Fenton conditions) leads to a fast aniline mineralization, which is notably increased by UVA irradiation (photoelectro-Fenton process). In photocatalysis with TiO2 suspensions, the presence of H2O2 and Fe(II) ions in solution notably increases the aniline degradation rate at the initial stages of the process, whereas the opposite effect occurs at long irradiation times. Benzoquinone, hydroquinone, nitrobenzene, phenol and 1,2,4-benzenetriol were detected as intermediates by HPLC in both, electrochemical and photocatalytic experiments. Short chain aliphatic acids, such as maleic and fumaric acids, were only found in the electrochemical experiments. Ammonium ions (75-80% of initial nitrogen) were generated in all solutions tested. A general reaction pathway that accounts for aniline mineralization to CO2 involving those products proposed.
Original languageEnglish
Pages (from-to)31-42
JournalApplied Catalysis B: Environmental
Volume16
Issue number1
DOIs
Publication statusPublished - 6 Mar 1998

Keywords

  • Aniline
  • Anodic oxidation
  • Fenton process
  • Photocatalysis

Fingerprint Dive into the research topics of 'Aniline mineralization by AOP's: Anodic oxidation, photocatalysis, electro-Fenton and photoelectro-Fenton processes'. Together they form a unique fingerprint.

Cite this