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

19 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

Fingerprint

Azo Compounds
Azo dyes
Nanotubes
Photocatalysis
dye
polarization
catalyst
Catalysts
Polarization
irradiation
Irradiation
Anodic polarization
Photolysis
Anodic oxidation
fluid dynamics
photolysis
Fluid dynamics
durability
microstructure
Anodes

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

Cite this

Electrophotocatalytic decolorization of an azo dye on TiO 2 self-organized nanotubes in a laboratory scale reactor. / Turolla, Andrea; Fumagalli, Massimo; Bestetti, Massimiliano; Antonelli, Manuela.

In: Desalination, Vol. 285, 31.01.2012, p. 377-382.

Research output: Contribution to journalArticle

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