Photoelectrochemical advanced oxidation processes on nanostructured TiO₂ catalysts: decolorization of a textile azo-dye
This work describes a novel approach for water treatment by photoelectrocatalysis, based on nanostructured TiO₂. The decolorization of aqueous solutions containing the azo-dye RR243 is carried out in a tubular photocatalytic reactor working in semi-batch mode under electrical polarization of the cat...
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| Veröffentlicht in: | Химия и технология воды |
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| Datum: | 2015 |
| ISSN: | 0204-3556 |
| Hauptverfasser: | , , , |
| Format: | Artikel |
| Sprache: | Englisch |
| Veröffentlicht: |
Інститут колоїдної хімії та хімії води ім. А.В. Думанського НАН України
2015
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| Online Zugang: | https://nasplib.isofts.kiev.ua/handle/123456789/132592 |
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| Назва журналу: | Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| Zitieren: | Photoelectrochemical advanced oxidation processes on nanostructured TiO₂ catalysts: decolorization of a textile azo-dye / S. Franz, D. Perego, O. Marchese, M. Bestetti // Химия и технология воды. — 2015. — Т. 37, № 3. — С. 207-219. — Бібліогр.: 22 назв. — англ. |
Institution
Digital Library of Periodicals of National Academy of Sciences of Ukraine| Zusammenfassung: | This work describes a novel approach for water treatment by photoelectrocatalysis, based on nanostructured TiO₂. The decolorization of aqueous solutions containing the azo-dye RR243 is carried out in a tubular photocatalytic reactor working in semi-batch mode under electrical polarization of the catalyst. Two different nanostructured catalysts were tested: nanotubular TiO₂ obtained by conventional anodization (CA), and a novel photoactive nanoporous TiO₂, obtained by plasma electrolytic oxidation (PEO). Neither UV irradiation of the TiO₂ catalysts nor the electrical bias individually considered lead to a significant reduction of the dye concentration. By irradiating the catalysts with UVC light while applying an electrical bias to the same, the concentration of the dye decreased from 25 L to 2,5 mg/L using the nanotubular CA TiO₂ catalyst, and to less than 1,8 mg/L using the novel nanoporous PEO TiO₂ in 50 min. The main advantages of this method over current approaches for the degradation of pollutants are both the considerable processing time reduction and a suitable and easy-to-scale-up reactor design. A further advantage is the relatively easyness in the production of the TiO₂ catalysts by PEO.
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| ISSN: | 0204-3556 |