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- Title
Development of Photocatalytically Active Anodized Layers by a Modified Phosphoric Acid Anodizing Process for Air Purification.
- Authors
Lederer, Stephan; Benfer, Sigrid; Bloh, Jonathan; Javed, Rezan; Pashkova, Aneta; Fuerbeth, Wolfram
- Abstract
One of the key urban air quality issues is pollution by nitrogen oxides (NO x ). To reduce NO x , facade cladding could be provided with photocatalytic properties by incorporating titanium dioxide nanoparticles. For this purpose, a modified phosphoric acid anodizing process (MPAA) was developed for the facade alloy EN AW-5005, in which highly ordered anodized structures with a low degree of arborization and tortuosity were produced. Pore widths between 70 nm and 150 nm and layer thicknesses of about 2–3 μ m were obtained. The subsequent impregnation was carried out by dip coating from water-based systems. Depending on the dip-coating parameters and the suspension used, the pores can be filled up to 60% with the TiO 2 nanoparticles. Photocatalytic tests according to ISO 22197-1 certify a high photocatalytic activity was obtained with rPCE values > 8 and with rPCE > 2, achieving "photocatalytically active for air purification". Tests on the corrosion resistance of the anodized coatings with a commercially available aluminum and facade cleaner confirm a protective effect of the anodized coatings when compared with nonanodized aluminum material, as well as with compacted anodized layers.
- Subjects
AIR quality; PHOTOCATALYSIS; PHOSPHORIC acid; ALUMINUM; TITANIUM oxides
- Publication
Corrosion & Materials Degradation, 2023, Vol 4, Issue 1, p18
- ISSN
2624-5558
- Publication type
Article
- DOI
10.3390/cmd4010002