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  4. Photocatalytic activity of TiO2 layers produced with plasma electrolytic oxidation
 
Zitierlink DOI
10.26092/elib/6

Photocatalytic activity of TiO2 layers produced with plasma electrolytic oxidation

Veröffentlichungsdatum
2018-06-25
Autoren
Friedemann, Ariane  
Thiel, Karsten  
Gesing, Thorsten M.  
Plagemann, Peter  
Zusammenfassung
The photocatalytic activity of titanium dioxide (TiO2) results from its crystalline phase's anatase and rutile. In this regard, plasma electrolytic oxidation (PEO) is a promising process for producing highly porous surfaces with a high proportion of crystalline phases into the oxide layer on pure titanium. PEO-coatings were produced under different conditions in various electrolytes in order to identify the crystalline fractions of the surfaces and to examine the associated photocatalytic activity. The composition of the PEO electrolyte was varied to optimize the polymorphic composition of the TiO2 comparable to the photocatalytic active TiO2 material AEROXIDE® P25. X-ray powder diffraction (XRD) was selected to identify the produced crystal structures of anatase and rutile on the surface material depending on the electrolytic system. In order to establish the expected band gap of the TiO2 on the surfaces, the samples were subjected to a diffuse reflectance measurement, which detected direct transitions for all samples using the TAUC and DASF methods. The acceptance of the photocatalytic reaction by the crystalline PEO-samples was further confirmed by the degradation of two typical dyes (methylene blue MB, rhodamine B RB) under UV-light irradiation. Both a high proportion of anatase and the presence of rutile on the PEO-layers had a targeted effect on the catalytic efficiency. However, the average crystallite sizes also played an important role in the samples produced in an optimum range of 30–40 nm. Both effects support the photocatalytic properties of PEO-surfaces.
Schlagwörter
Photocatalytic activity

; 

Plasma electrolytic oxidation

; 

Anatase Rutile

; 

Crystallinity

; 

TiO2 layer
Institution
Universität Bremen  
Fachbereich
Fachbereich 02: Biologie/Chemie (FB 02)  
Institute
Institut für Anorganische Chemie und Kristallographie  
Dokumenttyp
Artikel/Aufsatz
Zeitschrift/Sammelwerk
Surface and Coatings Technology  
Startseite
710
Endseite
721
Zweitveröffentlichung
Nein
Sprache
Englisch
Dateien
Lade...
Vorschaubild
Name

128_Post.pdf

Description
Postprint
Size

2.2 MB

Format

Adobe PDF

Checksum

(MD5):f67ff45a2bd8d8d09eb74487093e5357

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