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Titania and titania-silver nanoparticle deposits made by Liquid Flame Spray and their functionality as photocatalyst for organic- and biofilm removal |
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| Authors: | Helmi Keskinen Jyrki M Mäkelä Mikko Aromaa Jorma Keskinen Sami Areva Cilâine V Teixeira Jarl B Rosenholm Viljami Pore Mikko Ritala Markku Leskelä Mari Raulio Mirja S Salkinoja-Salonen Erkki Levänen Tapio Mäntylä |
| Affiliation: | 1. Institute of Physics, Tampere University of Technology, P.O. Box 692, FIN-33101, Tampere, Finland 2. Department of Physical Chemistry, ?bo Akademi University Porthansgatan 3–5, FIN-20500, Turku, Finland 3. Laboratory of Inorganic Chemistry, Department of Chemistry, University of Helsinki, P.O. Box 55, FIN-00014, Helsinki, Finland 4. Department of Applied Chemistry and Microbiology, University of Helsinki, P.O. Box 56, FIN-00014, Helsinki, Finland 5. Institute of Material Sciences, Tampere University of Technology, P.O. Box 589, FIN-33101, Tampere, Finland |
| Abstract: | Titania and titania-silver nanoparticle deposits were made by Liquid Flame Spray technique, in which the liquid precursor is injected into a high temperature flame, where it will evaporate and nucleate to nanosize particles. One-step and two-step methods were used for preparation of titania-silver deposits. The amount of silver added was 1 wt%. The deposits were collected in the flame zone on steel and glass surfaces and were analyzed by TEM, EDS, XPS and SAXS. The titania deposits consisted of porous nanosized titania agglomerates of primary particles (~10 nm). With silver addition, small spherical silver metal particles (~2 nm) were detected on the agglomerates. An increase in the photocatalytic activity was verified by stearic acid decomposition and biofilm removal using Deinococcus geothermalis as the model organism. |
| Keywords: | liquid flame spray deposits photocatalyst titanium dioxide |
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