Electrophotocatalytic decolorization of an azo dye on TiO 2 self-organized nanotubes in a laboratory scale reactor

Andrea Turolla, Massimo Fumagalli, Massimiliano Bestetti, Manuela Antonelli

Research output: Contribution to journalArticle

21 Citations (Scopus)

Abstract

It was investigated the feasibility of decolorization of an azo dye (DG 26) using a large scale nanotubular TiO 2 structured electrode in a laboratory photoelectrochemical reactor (0.8L). Catalyst was grown by anodic oxidation directly on Ti surface and its microstructure and crystalline structure were characterized with SEM and XRD. TiO 2/Ti photoactivity under different anodic polarization values was evaluated via photoelectrochemical tests. The nanostructured TiO 2 was used in a reactor as photo-anode under UV monochromatic irradiation (254nm) and it was subjected to bias (+1.5V vs. SCE). A comparison with photolysis and photocatalysis processes was carried out under the same operating conditions to evaluate the synergistic action of photocatalysis and TiO 2/Ti electrochemical polarization. Electrophotocatalysis was proven to be more effective than photocatalysis in DG 26 decolorization. Catalyst polarization resulted in synergistic effect on process yields. The complete decolorization of a 40. mg/L solution of DG 26 was achieved in 24. h, without adding chemical reagents, and catalyst durability was demonstrated over 360. h tests. Therefore, the work done is challenging to prove that the process (irradiation. +. catalyst. +. polarization) is feasible and effectively up-grading to pilot and demonstrative scale applications after a fluid dynamics optimization of the photoreactor.

Original languageEnglish
Pages (from-to)377-382
Number of pages6
JournalDesalination
Volume285
DOIs
Publication statusPublished - 31 Jan 2012
Externally publishedYes

Keywords

  • Advanced oxidation processes
  • Anodic oxidation
  • Bias
  • Photocatalysis
  • Titanium dioxide

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Materials Science(all)
  • Water Science and Technology
  • Mechanical Engineering

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