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 language | English |
|---|---|
| Pages (from-to) | 377-382 |
| Number of pages | 6 |
| Journal | Desalination |
| Volume | 285 |
| DOIs | |
| Publication status | Published - 31 Jan 2012 |
| Externally published | Yes |
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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 journal › Article
}
TY - JOUR
T1 - Electrophotocatalytic decolorization of an azo dye on TiO 2 self-organized nanotubes in a laboratory scale reactor
AU - Turolla, Andrea
AU - Fumagalli, Massimo
AU - Bestetti, Massimiliano
AU - Antonelli, Manuela
PY - 2012/1/31
Y1 - 2012/1/31
N2 - 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.
AB - 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.
KW - Advanced oxidation processes
KW - Anodic oxidation
KW - Bias
KW - Photocatalysis
KW - Titanium dioxide
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UR - http://www.scopus.com/inward/citedby.url?scp=84855190967&partnerID=8YFLogxK
U2 - 10.1016/j.desal.2011.10.029
DO - 10.1016/j.desal.2011.10.029
M3 - Article
VL - 285
SP - 377
EP - 382
JO - Desalination
JF - Desalination
SN - 0011-9164
ER -